Merge remote-tracking branch 'tom/socis/master'

author: Johnathan Corgan <johnathan@corganlabs.com> 2015-09-23 07:25:23 -0700
committer: Johnathan Corgan <johnathan@corganlabs.com> 2015-09-23 07:25:23 -0700
commit: 45faa98d307f84c6000fe32d69f6c12eb8efd180 (patch)
tree: c9d1ec5f869028b5eca99bc6a49da825083d3395 /gr-fec
parent: ffbd9d9c6c9d8c122d90462a96fc0f0f92a3c2b8 (diff)
parent: ad3a02f6c829e9b3ba9ebaef437e1a6087978855 (diff)
45 files changed, 15302 insertions, 2 deletions
diff --git a/gr-fec/doc/fec.dox b/gr-fec/doc/fec.dox
index e886212e8d..33a825ac77 100644
--- a/gr-fec/doc/fec.dox
+++ b/gr-fec/doc/fec.dox
@@ -233,11 +233,14 @@ Coders:
 \li gr::fec::code::repetition_encoder
 \li gr::fec::code::cc_encoder
 \li gr::fec::code::ccsds_encoder
+\li gr::fec::code::polar_encoder
 
 Decoders:
 \li gr::fec::code::dummy_decoder
 \li gr::fec::code::repetition_decoder
 \li gr::fec::code::cc_decoder
+\li gr::fec::code::polar_decoder_sc
+\li gr::fec::code::polar_decoder_sc_list
 
 
 When building a new FECAPI encoder or decoder variable, the dummy
diff --git a/gr-fec/examples/.gitignore b/gr-fec/examples/.gitignore
new file mode 100644
index 0000000000..c3393475b0
--- /dev/null
+++ b/gr-fec/examples/.gitignore
@@ -0,0 +1,3 @@
+*.py
+callgrind.out.*
+perf.*
diff --git a/gr-fec/examples/CMakeLists.txt b/gr-fec/examples/CMakeLists.txt
index 88d6d5c069..b396ba625b 100644
--- a/gr-fec/examples/CMakeLists.txt
+++ b/gr-fec/examples/CMakeLists.txt
@@ -32,6 +32,12 @@ install(
     fecapi_async_packed_decoders.grc
     fecapi_tagged_decoders.grc
     fecapi_tagged_encoders.grc
+    fecapi_cc_decoders.grc
+    fecapi_polar_async_packed_decoders.grc
+    fecapi_polar_decoders.grc
+    fecapi_polar_encoders.grc
+    polar_ber_curve_gen.grc
+    polar_code_example.grc
     tpc_ber_curve_gen.grc
     DESTINATION ${GR_PKG_FEC_EXAMPLES_DIR}
     COMPONENT "fec_python"
diff --git a/gr-fec/examples/fecapi_polar_async_packed_decoders.grc b/gr-fec/examples/fecapi_polar_async_packed_decoders.grc
new file mode 100644
index 0000000000..e7660cf5e2
--- /dev/null
+++ b/gr-fec/examples/fecapi_polar_async_packed_decoders.grc
@@ -0,0 +1,1626 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.9'?>
+<flow_graph>
+  <timestamp>Tue Sep 22 15:36:05 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1920, 1080</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 8)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fecapi_polar_decoder_examples</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Polar decoder examples</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value>codeword size of polar codes.
+
+MUST be a power of 2!
+MUST be greater than 'frame_size'.</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(840, 499)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>512</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_code_configurator</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>channel</key>
+      <value>polar.CHANNEL_TYPE_BEC</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Block is used to configure polar encoders and decoders.
+
+returns dictionary with requested configuration.
+
+most important dict values: 'values' and 'positions'</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(664, 499)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_config</value>
+    </param>
+    <param>
+      <key>design_snr</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>32</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Standard 'Successive Cancellation' decoder.
+
+performs better with greater block size.
+This is due to stronger polarization at higher block sizes.</value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 651)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_decoder_sc</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(400, 507)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_sc</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 99)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(50e3)</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(136, 459)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_random_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>256</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1176, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_0_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(672, 235)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 395)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_ctrlport_monitor_performance</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>en</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(384, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_ctrlport_monitor_performance_0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_pdu_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(952, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_pdu_to_tagged_stream_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_pdu_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(976, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_pdu_to_tagged_stream_0_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_repack_bits_bb</key>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>l</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_MSB_FIRST</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(920, 227)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_repack_bits_bb_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>align_output</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_stream_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(168, 387)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_stream_to_tagged_stream_0_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packet_len</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_tagged_stream_to_pdu</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(488, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_tagged_stream_to_pdu_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_tagged_stream_to_pdu</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(528, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_tagged_stream_to_pdu_1</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(168, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vector_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(136, 203)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_vector_source_x_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>tags</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vector</key>
+      <value>(frame_size/15)*[0, 0, 1, 0, 3, 0, 7, 0, 15, 0, 31, 0, 63, 0, 127]</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_map_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(808, 235)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>digital_map_bb_0</value>
+    </param>
+    <param>
+      <key>map</key>
+      <value>[-1,1]</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_async_decoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder</key>
+      <value>polar_decoder_sc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(736, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_async_decoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packed</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>rev_pack</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_async_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder</key>
+      <value>polar_encoder_sc</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(712, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_async_encoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packed</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>rev_pack</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>rev_unpack</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(184, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frame Size</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>30</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(296, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'11'</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ctrlpanel</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1336, 363)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>legend</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Decoded</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>0.6</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Input</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>Rep. (Rate=3)</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value>CC (K=7, Rate=2)</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value>CCSDS</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>512</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>ylabel</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>yunit</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>140</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_0_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1</source_block_id>
+    <sink_block_id>blocks_tagged_stream_to_pdu_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pdu_to_tagged_stream_0</source_block_id>
+    <sink_block_id>blocks_repack_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pdu_to_tagged_stream_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_repack_bits_bb_0</source_block_id>
+    <sink_block_id>digital_map_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_stream_to_tagged_stream_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_stream_to_tagged_stream_0_0</source_block_id>
+    <sink_block_id>blocks_tagged_stream_to_pdu_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_tagged_stream_to_pdu_0</source_block_id>
+    <sink_block_id>fec_async_encoder_0</sink_block_id>
+    <source_key>pdus</source_key>
+    <sink_key>in</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_tagged_stream_to_pdu_1</source_block_id>
+    <sink_block_id>fec_async_decoder_0</sink_block_id>
+    <source_key>pdus</source_key>
+    <sink_key>in</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_stream_to_tagged_stream_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0_1_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_map_bb_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_async_decoder_0</source_block_id>
+    <sink_block_id>blocks_pdu_to_tagged_stream_0_0</sink_block_id>
+    <source_key>out</source_key>
+    <sink_key>pdus</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_async_encoder_0</source_block_id>
+    <sink_block_id>blocks_pdu_to_tagged_stream_0</sink_block_id>
+    <source_key>out</source_key>
+    <sink_key>pdus</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-fec/examples/fecapi_polar_decoders.grc b/gr-fec/examples/fecapi_polar_decoders.grc
new file mode 100644
index 0000000000..83e86fde40
--- /dev/null
+++ b/gr-fec/examples/fecapi_polar_decoders.grc
@@ -0,0 +1,2102 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.9'?>
+<flow_graph>
+  <timestamp>Tue Sep 22 15:13:38 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1920, 1080</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 8)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fecapi_polar_decoders</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Polar Decoders Example</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value>codeword size of polar codes.
+
+MUST be a power of 2!
+MUST be greater than 'frame_size'.</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1320, 547)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>512</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_dummy_decoder_def</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>framebits</key>
+      <value>frame_size*8</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(152, 643)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>dec_dummy</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>"ok"</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_dummy_encoder_def</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>4</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>framebits</key>
+      <value>frame_size*8</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(152, 563)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>enc_dummy</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_code_configurator</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>channel</key>
+      <value>polar.CHANNEL_TYPE_BEC</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Block is used to configure polar encoders and decoders.
+
+returns dictionary with requested configuration.
+
+most important dict values: 'values' and 'positions'</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1144, 547)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_config</value>
+    </param>
+    <param>
+      <key>design_snr</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>32</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Standard 'Successive Cancellation' decoder.
+
+performs better with greater block size.
+This is due to stronger polarization at higher block sizes.</value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(408, 691)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_decoder_sc</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_list_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Advanced 'Successive Cancellation List' decoder
+
+Greater list size usually results in better decoding performance.
+But it is computationally more heavy.</value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(776, 691)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_decoder_scl</value>
+    </param>
+    <param>
+      <key>max_list_size</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(408, 547)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_sc</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(776, 547)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_scl</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>50000</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(160, 459)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_random_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>256</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(768, 427)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1136, 427)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1136, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1136, 235)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_0_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(432, 147)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(768, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_2</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(768, 235)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_2_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_ctrlport_monitor_performance</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>en</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(392, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_ctrlport_monitor_performance_0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(208, 267)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_unpack_k_bits_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(224, 371)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_unpack_k_bits_bb_0</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vector_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(168, 139)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_vector_source_x_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>tags</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vector</key>
+      <value>(frame_size/15)*[0, 0, 1, 0, 3, 0, 7, 0, 15, 0, 31, 0, 63, 0, 127]</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_map_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 427)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>digital_map_bb_0_0</value>
+    </param>
+    <param>
+      <key>map</key>
+      <value>[-1, 1]</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_map_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>digital_map_bb_0_0_0</value>
+    </param>
+    <param>
+      <key>map</key>
+      <value>[-1, 1]</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_map_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 235)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>digital_map_bb_0_0_0_0</value>
+    </param>
+    <param>
+      <key>map</key>
+      <value>[-1, 1]</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_decoder</key>
+    <param>
+      <key>ann</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>polar_decoder_scl</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(912, 403)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_decoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>fec_extended_decoder</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_decoder</key>
+    <param>
+      <key>ann</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>polar_decoder_sc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(912, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_decoder_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>fec_extended_decoder</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_decoder</key>
+    <param>
+      <key>ann</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>dec_dummy</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(912, 211)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_decoder_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>fec_extended_decoder</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder_scl</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(432, 411)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_encoder_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>capillary</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder_sc</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(432, 315)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_encoder_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>capillary</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>enc_dummy</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(432, 219)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_encoder_1_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>capillary</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(200, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frame Size</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>30</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(312, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'11'</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ctrlpanel</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1408, 153)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>legend</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Input</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>0.6</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Dummy</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>Polar with SC decoder</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value>Polar with SC list decoder</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value>CCSDS</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>4</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>2048</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>ylabel</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>yunit</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1.5</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-0.5</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0</source_block_id>
+    <sink_block_id>fec_extended_decoder_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>3</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>2</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_0_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_2</source_block_id>
+    <sink_block_id>fec_extended_decoder_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_2_0</source_block_id>
+    <sink_block_id>fec_extended_decoder_0_1_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_unpack_k_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_extended_encoder_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_extended_encoder_1_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_extended_encoder_1_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0_1_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_map_bb_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_map_bb_0_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_map_bb_0_0_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_2_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_decoder_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_decoder_0_1</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_decoder_0_1_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_encoder_1</source_block_id>
+    <sink_block_id>digital_map_bb_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_encoder_1_0</source_block_id>
+    <sink_block_id>digital_map_bb_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_encoder_1_0_0</source_block_id>
+    <sink_block_id>digital_map_bb_0_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-fec/examples/fecapi_polar_encoders.grc b/gr-fec/examples/fecapi_polar_encoders.grc
new file mode 100644
index 0000000000..93036fd834
--- /dev/null
+++ b/gr-fec/examples/fecapi_polar_encoders.grc
@@ -0,0 +1,1808 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.9'?>
+<flow_graph>
+  <timestamp>Tue Sep 22 15:53:02 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1920, 1080</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 8)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fecapi_polar_encoders</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>Polar encoder examples</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>frame_size * 8</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_code_configurator</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>channel</key>
+      <value>polar.CHANNEL_TYPE_BEC</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>Block is used to configure polar encoders and decoders.
+
+returns dictionary with requested configuration.
+
+most important dict values: 'values' and 'positions'</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(704, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_config</value>
+    </param>
+    <param>
+      <key>design_snr</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>32</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1152, 635)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_async</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>frame_size * 8</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(488, 635)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_stream</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(840, 635)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_tagged</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 91)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>int(50e3)</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(208, 483)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_random_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>256</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value>codeword size of polar codes.
+
+MUST be a power of 2!
+MUST be greater than 'frame_size'.</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(296, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Block size</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>512</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1064, 499)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1064, 259)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_1_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1064, 339)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_1_0_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_ctrlport_monitor_performance</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>en</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(496, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_ctrlport_monitor_performance_0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_pdu_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(536, 499)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_pdu_to_tagged_stream_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_repack_bits_bb</key>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>l</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_MSB_FIRST</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(736, 491)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_repack_bits_bb_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>align_output</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_repack_bits_bb</key>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>l</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_MSB_FIRST</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(640, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_repack_bits_bb_0_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>length_tag</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>align_output</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_stream_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_stream_to_tagged_stream_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>length_tag</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packet_len</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_stream_to_tagged_stream</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 411)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_stream_to_tagged_stream_0_0</value>
+    </param>
+    <param>
+      <key>len_tag_key</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packet_len</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_tagged_stream_to_pdu</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(648, 419)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_tagged_stream_to_pdu_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>tag</key>
+      <value>pkt_len</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(216, 355)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_unpack_k_bits_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 259)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_unpack_k_bits_bb_0</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vector_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(176, 251)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_vector_source_x_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>tags</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vector</key>
+      <value>(frame_size/15)*[0, 0, 1, 0, 3, 0, 7, 0, 15, 0, 31, 0, 63, 0, 127]</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_async_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>encoder</key>
+      <value>polar_encoder_async</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(872, 419)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_async_encoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>packed</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>rev_pack</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>rev_unpack</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder_stream</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(568, 243)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_encoder_0_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_tagged_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder_tagged</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(824, 323)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_tagged_encoder_0_0</value>
+    </param>
+    <param>
+      <key>lentagname</key>
+      <value>length_tag</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>puncpat</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(184, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frame Size</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>intx</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>30</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(408, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>puncpat</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'11'</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ctrlpanel</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1264, 313)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0_0_1</value>
+    </param>
+    <param>
+      <key>legend</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Polar extended encoder</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>0.6</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Polar extended tagged encoder</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>Polar async encoder</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>3</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>2050</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>packet_len</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.05</value>
+    </param>
+    <param>
+      <key>ylabel</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>yunit</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1.5</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-0.5</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>2</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_1_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_1_0_0_1</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pdu_to_tagged_stream_0</source_block_id>
+    <sink_block_id>blocks_repack_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_repack_bits_bb_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_repack_bits_bb_0_0</source_block_id>
+    <sink_block_id>fec_extended_tagged_encoder_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_stream_to_tagged_stream_0</source_block_id>
+    <sink_block_id>blocks_repack_bits_bb_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_stream_to_tagged_stream_0_0</source_block_id>
+    <sink_block_id>blocks_tagged_stream_to_pdu_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_tagged_stream_to_pdu_0</source_block_id>
+    <sink_block_id>fec_async_encoder_0</sink_block_id>
+    <source_key>pdus</source_key>
+    <sink_key>in</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_stream_to_tagged_stream_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_stream_to_tagged_stream_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>blocks_unpack_k_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_extended_encoder_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0_1_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_async_encoder_0</source_block_id>
+    <sink_block_id>blocks_pdu_to_tagged_stream_0</sink_block_id>
+    <source_key>out</source_key>
+    <sink_key>pdus</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_encoder_0_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_1_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_tagged_encoder_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_1_0_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-fec/examples/polar_ber_curve_gen.grc b/gr-fec/examples/polar_ber_curve_gen.grc
new file mode 100644
index 0000000000..19fbaba4fc
--- /dev/null
+++ b/gr-fec/examples/polar_ber_curve_gen.grc
@@ -0,0 +1,1602 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.9'?>
+<flow_graph>
+  <timestamp>Fri Jul 17 15:23:09 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value>Johannes Demel</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1920,1080</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_ber_curve_gen</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>polar code BER curve generator</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(304, 35)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1024</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_cc_decoder_def</key>
+    <param>
+      <key>padding</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>k</value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>state_end</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>framebits</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1368, 395)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>dec_cc</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>"ok"</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>polys</key>
+      <value>polys</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>rate</value>
+    </param>
+    <param>
+      <key>state_start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>mode</key>
+      <value>fec.CC_STREAMING</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_cc_encoder_def</key>
+    <param>
+      <key>padding</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>k</value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>framebits</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1368, 187)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>enc_cc</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>polys</key>
+      <value>polys</value>
+    </param>
+    <param>
+      <key>rate</key>
+      <value>rate</value>
+    </param>
+    <param>
+      <key>state_start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>mode</key>
+      <value>fec.CC_STREAMING</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(704, 19)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>esno</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>numpy.arange(-1, 4, 0.5)</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1440, 51)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>frame_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>block_size / 2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1368, 115)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>k</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>7</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(536, 171)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>list_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>8</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 35)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>block_size / 2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_code_configurator</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>channel</key>
+      <value>polar.CHANNEL_TYPE_BEC</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(328, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_config</value>
+    </param>
+    <param>
+      <key>design_snr</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>32</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(192, 419)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_decoder</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(192, 251)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(456, 243)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder_scld</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_list_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>len(esno)</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(456, 411)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_scld</value>
+    </param>
+    <param>
+      <key>max_list_size</key>
+      <value>list_size</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1440, 115)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polys</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>[79, 109]</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1368, 51)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(16, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>350e3</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_bercurve_generator</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>polar_decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder</value>
+    </param>
+    <param>
+      <key>esno</key>
+      <value>esno</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(808, 123)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_curve_gen_sc</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>'11'</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>3200000</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>"none"</value>
+    </param>
+    <bus_source>1</bus_source>
+  </block>
+  <block>
+    <key>fec_bercurve_generator</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>polar_scld</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder_scld</value>
+    </param>
+    <param>
+      <key>esno</key>
+      <value>esno</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(808, 227)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_curve_gen_scld</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>'11'</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>3200000</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>"none"</value>
+    </param>
+    <bus_source>1</bus_source>
+  </block>
+  <block>
+    <key>fec_bercurve_generator</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>dec_cc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>enc_cc</value>
+    </param>
+    <param>
+      <key>esno</key>
+      <value>esno</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(808, 331)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_curve_gen_scld_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>'11'</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>3200000</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>"capillary"</value>
+    </param>
+    <bus_source>1</bus_source>
+  </block>
+  <block>
+    <key>qtgui_bercurve_sink</key>
+    <param>
+      <key>berlimit</key>
+      <value>-7.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>curvenames</key>
+      <value>['POLAR decoder', 'POLAR decoder list', 'CC']</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1176, 146)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_bercurve_sink_0</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>POLAR decoder</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>POLAR list decoder</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>CC convolutional</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>berminerrors</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>num_curves</key>
+      <value>3</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-10</value>
+    </param>
+    <param>
+      <key>esno</key>
+      <value>esno</value>
+    </param>
+    <bus_sink>1</bus_sink>
+  </block>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>20</source_key>
+    <sink_key>60</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>10</source_key>
+    <sink_key>10</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>11</source_key>
+    <sink_key>11</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>12</source_key>
+    <sink_key>12</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>13</source_key>
+    <sink_key>13</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>14</source_key>
+    <sink_key>14</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>15</source_key>
+    <sink_key>15</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>16</source_key>
+    <sink_key>16</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>17</source_key>
+    <sink_key>17</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>18</source_key>
+    <sink_key>18</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>19</source_key>
+    <sink_key>19</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>2</source_key>
+    <sink_key>2</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>3</source_key>
+    <sink_key>3</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>4</source_key>
+    <sink_key>4</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>5</source_key>
+    <sink_key>5</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>6</source_key>
+    <sink_key>6</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>7</source_key>
+    <sink_key>7</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>8</source_key>
+    <sink_key>8</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_sc</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>9</source_key>
+    <sink_key>9</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>20</source_key>
+    <sink_key>61</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>20</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>21</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>10</source_key>
+    <sink_key>30</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>11</source_key>
+    <sink_key>31</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>12</source_key>
+    <sink_key>32</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>13</source_key>
+    <sink_key>33</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>14</source_key>
+    <sink_key>34</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>15</source_key>
+    <sink_key>35</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>16</source_key>
+    <sink_key>36</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>17</source_key>
+    <sink_key>37</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>18</source_key>
+    <sink_key>38</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>19</source_key>
+    <sink_key>39</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>2</source_key>
+    <sink_key>22</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>3</source_key>
+    <sink_key>23</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>4</source_key>
+    <sink_key>24</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>5</source_key>
+    <sink_key>25</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>6</source_key>
+    <sink_key>26</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>7</source_key>
+    <sink_key>27</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>8</source_key>
+    <sink_key>28</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>9</source_key>
+    <sink_key>29</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>20</source_key>
+    <sink_key>62</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>40</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>41</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>10</source_key>
+    <sink_key>50</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>11</source_key>
+    <sink_key>51</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>12</source_key>
+    <sink_key>52</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>13</source_key>
+    <sink_key>53</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>14</source_key>
+    <sink_key>54</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>15</source_key>
+    <sink_key>55</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>16</source_key>
+    <sink_key>56</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>17</source_key>
+    <sink_key>57</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>18</source_key>
+    <sink_key>58</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>19</source_key>
+    <sink_key>59</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>2</source_key>
+    <sink_key>42</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>3</source_key>
+    <sink_key>43</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>4</source_key>
+    <sink_key>44</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>5</source_key>
+    <sink_key>45</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>6</source_key>
+    <sink_key>46</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>7</source_key>
+    <sink_key>47</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>8</source_key>
+    <sink_key>48</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>polar_curve_gen_scld_0</source_block_id>
+    <sink_block_id>qtgui_bercurve_sink_0</sink_block_id>
+    <source_key>9</source_key>
+    <sink_key>49</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-fec/examples/polar_code_example.grc b/gr-fec/examples/polar_code_example.grc
new file mode 100644
index 0000000000..ff0a277de5
--- /dev/null
+++ b/gr-fec/examples/polar_code_example.grc
@@ -0,0 +1,3022 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.9'?>
+<flow_graph>
+  <timestamp>Thu Jul 16 16:19:12 2015</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value>Johannes Demel</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1920, 1080</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(10, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_code_example</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>POLAR code example flowgraph</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(192, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1024</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(192, 75)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>block_size / 2</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(24, 275)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,0,1,2</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>noise</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Noive Voltage</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>rangeType</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_code_configurator</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>channel</key>
+      <value>polar.CHANNEL_TYPE_BEC</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(296, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_config</value>
+    </param>
+    <param>
+      <key>design_snr</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>mu</key>
+      <value>32</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(680, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_decoder</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_encoder_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(504, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_encoder</value>
+    </param>
+    <param>
+      <key>is_packed</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_polar_decoder_sc_list_def</key>
+    <param>
+      <key>num_info_bits</key>
+      <value>n_info_bits</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block_size</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>dim1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>dim2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>frozen_bit_positions</key>
+      <value>polar_config['positions']</value>
+    </param>
+    <param>
+      <key>frozen_bit_values</key>
+      <value>polar_config['values']</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(896, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>polar_scld</value>
+    </param>
+    <param>
+      <key>max_list_size</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>ndim</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 107)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>350e3</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_fastnoise_source_x</key>
+    <param>
+      <key>amp</key>
+      <value>noise</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(16, 403)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_fastnoise_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples</key>
+      <value>8192</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_fastnoise_source_x</key>
+    <param>
+      <key>amp</key>
+      <value>noise</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(240, 667)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_fastnoise_source_x_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>samples</key>
+      <value>8192</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(24, 171)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>analog_random_source_x_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>256</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>2 ** 10 +1</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(480, 401)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_add_xx_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(464, 633)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_add_xx_0_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1096, 507)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(928, 803)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1096, 451)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(928, 755)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_1_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(488, 507)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_float_0_2</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_short</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(328, 401)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_short_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_short</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(296, 633)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_char_to_short_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_pack_k_bits_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(912, 507)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_pack_k_bits_bb_0</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_pack_k_bits_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(112, 859)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_pack_k_bits_bb_0_0</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_short_to_char</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(608, 417)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_short_to_char_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_short_to_char</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(576, 649)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_short_to_char_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_unpack_k_bits_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(240, 291)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_unpack_k_bits_bb_0</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_map_bb</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(344, 507)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>digital_map_bb_0</value>
+    </param>
+    <param>
+      <key>map</key>
+      <value>[-1, 1]</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_ber_bf</key>
+    <param>
+      <key>berlimit</key>
+      <value>-7.0</value>
+    </param>
+    <param>
+      <key>berminerrors</key>
+      <value>10000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1112, 201)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_ber_bf_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>test_mode</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_ber_bf</key>
+    <param>
+      <key>berlimit</key>
+      <value>-7.0</value>
+    </param>
+    <param>
+      <key>berminerrors</key>
+      <value>10000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(912, 889)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_ber_bf_0_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>test_mode</key>
+      <value>False</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_decoder</key>
+    <param>
+      <key>ann</key>
+      <value>None</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>decoder_list</key>
+      <value>polar_decoder</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(656, 483)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_decoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>'11'</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>fec_extended_decoder</value>
+    </param>
+  </block>
+  <block>
+    <key>fec_extended_encoder</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>encoder_list</key>
+      <value>polar_encoder</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 275)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>fec_extended_encoder_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>puncpat</key>
+      <value>'11'</value>
+    </param>
+    <param>
+      <key>threadtype</key>
+      <value>none</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_number_sink</key>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>avg</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1264, 187)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>2,0,1,1</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_number_sink_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>BER</value>
+    </param>
+    <param>
+      <key>unit1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Coded</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_number_sink</key>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>avg</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1096, 875)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>2,1,1,1</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_number_sink_0_0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>BER</value>
+    </param>
+    <param>
+      <key>unit1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>factor9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>unit9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-10</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Uncoded</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ctrlpanel</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1264, 451)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,0,1,1</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>legend</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Transmitted</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Received</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Coded</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>ylabel</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>yunit</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-10</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>ctrlpanel</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1096, 755)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,1,1,1</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>grid</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0_0</value>
+    </param>
+    <param>
+      <key>legend</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Transmitted</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Received</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Uncoded</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>ylabel</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>yunit</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_sink</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(240, 155)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_sink_0</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_packed</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_sink</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(424, 227)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_sink_0_0</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_unpacked</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(712, 883)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_packed</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1080, 395)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0_0</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_packed</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(728, 755)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0_0_0</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_packed</value>
+    </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(80, 627)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>virtual_source_0_1</value>
+    </param>
+    <param>
+      <key>stream_id</key>
+      <value>input_unpacked</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>analog_fastnoise_source_x_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>analog_fastnoise_source_x_0_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>blocks_unpack_k_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>fec_ber_bf_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>analog_random_source_x_0</source_block_id>
+    <sink_block_id>virtual_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_add_xx_0</source_block_id>
+    <sink_block_id>blocks_short_to_char_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_add_xx_0_0</source_block_id>
+    <sink_block_id>blocks_short_to_char_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_1_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_float_0_2</source_block_id>
+    <sink_block_id>fec_extended_decoder_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_short_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_char_to_short_0_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pack_k_bits_bb_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_ber_bf_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pack_k_bits_bb_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_pack_k_bits_bb_0_0</source_block_id>
+    <sink_block_id>fec_ber_bf_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_char_0</source_block_id>
+    <sink_block_id>digital_map_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_char_0_0</source_block_id>
+    <sink_block_id>blocks_pack_k_bits_bb_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>fec_extended_encoder_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpack_k_bits_bb_0</source_block_id>
+    <sink_block_id>virtual_sink_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_map_bb_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_ber_bf_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_ber_bf_0_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_decoder_0</source_block_id>
+    <sink_block_id>blocks_pack_k_bits_bb_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>fec_extended_encoder_0</source_block_id>
+    <sink_block_id>blocks_char_to_short_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>fec_ber_bf_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0_0_0</source_block_id>
+    <sink_block_id>blocks_char_to_float_0_1_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0_1</source_block_id>
+    <sink_block_id>blocks_char_to_short_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/gr-fec/grc/fec_block_tree.xml b/gr-fec/grc/fec_block_tree.xml
index 0fddcf3fab..65a4fc8a14 100644
--- a/gr-fec/grc/fec_block_tree.xml
+++ b/gr-fec/grc/fec_block_tree.xml
@@ -15,6 +15,8 @@
       <block>variable_ldpc_decoder_def</block>
       <block>variable_tpc_decoder_def</block>
       <block>variable_dummy_decoder_def</block>
+      <block>variable_polar_decoder_sc_def</block>
+      <block>variable_polar_decoder_sc_list_def</block>
     </cat>
     <cat>
       <name>Encoders</name>
@@ -24,6 +26,7 @@
       <block>variable_ldpc_encoder_def</block>
       <block>variable_tpc_encoder_def</block>
       <block>variable_dummy_encoder_def</block>
+      <block>variable_polar_encoder_def</block>
     </cat>
     <block>fec_extended_encoder</block>
     <block>fec_extended_async_encoder</block>
@@ -42,5 +45,6 @@
     <block>fec_depuncture_bb</block>
     <block>fec_ber_bf</block>
     <block>fec_bercurve_generator</block>
+    <block>variable_polar_code_configurator</block>
   </cat>
 </cat>
diff --git a/gr-fec/grc/variable_polar_code_configurator.xml b/gr-fec/grc/variable_polar_code_configurator.xml
new file mode 100644
index 0000000000..dd28e494c2
--- /dev/null
+++ b/gr-fec/grc/variable_polar_code_configurator.xml
@@ -0,0 +1,51 @@
+<?xml version="1.0"?>
+<block>
+  <name>POLAR code Configurator</name>
+  <key>variable_polar_code_configurator</key>
+  <import>from gnuradio.fec import polar</import>
+  <var_make>self.$(id) = $(id) = polar.load_frozen_bits_info(False, $channel, $block_size, $num_info_bits, $design_snr, $mu)</var_make>
+  <var_value>polar.load_frozen_bits_info(True, $channel, $block_size, $num_info_bits, $design_snr, $mu)</var_value>
+  <make></make>
+
+  <param>
+    <name>Channel</name>
+    <key>channel</key>
+    <value>polar.CHANNEL_TYPE_BEC</value>
+    <type>string</type>
+      <option>
+        <name>BEC</name>
+        <key>polar.CHANNEL_TYPE_BEC</key>
+      </option>
+      <option>
+        <name>BSC</name>
+        <key>polar.CHANNEL_TYPE_BSC</key>
+      </option>
+  </param>
+
+  <param>
+    <name>Block size (N)</name>
+    <key>block_size</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>#Info Bits (K)</name>
+    <key>num_info_bits</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>design SNR</name>
+    <key>design_snr</key>
+    <value>0.0</value>
+    <type>float</type>
+  </param>
+
+  <param>
+    <name>mu</name>
+    <key>mu</key>
+    <value>16</value>
+    <type>int</type>
+    <hide>#if 'BEC' in $getVar('channel') then 'all' else 'none' #</hide>
+  </param>
+</block>
+\ No newline at end of file
diff --git a/gr-fec/grc/variable_polar_decoder_sc.xml b/gr-fec/grc/variable_polar_decoder_sc.xml
new file mode 100644
index 0000000000..4976afb4b6
--- /dev/null
+++ b/gr-fec/grc/variable_polar_decoder_sc.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0"?>
+<block>
+  <name>POLAR Decoder SC Definition</name>
+  <key>variable_polar_decoder_sc_def</key>
+  <import>from gnuradio import fec</import>
+  <var_make>#if int($ndim())==0 #
+self.$(id) = $(id) = fec.polar_decoder_sc.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values) #slurp
+#else if int($ndim())==1 #
+self.$(id) = $(id) = map((lambda a: fec.polar_decoder_sc.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)), range(0, $dim1) ) #slurp
+#else
+self.$(id) = $(id) = map((lambda b: map((lambda a: fec.polar_decoder_sc.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)), range(0, $dim2))), range(0, $dim1)) #slurp
+#end if</var_make>
+  <var_value>fec.polar_decoder_sc.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)</var_value>
+  <make></make>
+
+  <param>
+    <name>Parallelism</name>
+    <key>ndim</key>
+    <value>0</value>
+    <type>enum</type>
+    <option>
+      <name>0</name>
+      <key>0</key>
+    </option>
+    <option>
+      <name>1</name>
+      <key>1</key>
+    </option>
+    <option>
+      <name>2</name>
+      <key>2</key>
+      </option>
+  </param>
+
+  <param>
+    <name>Dimension 1</name>
+    <key>dim1</key>
+    <value>1</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 1) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Dimension 2</name>
+    <key>dim2</key>
+    <value>4</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 2) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Block size (N)</name>
+    <key>block_size</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>#Info Bits (K)</name>
+    <key>num_info_bits</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Positions</name>
+    <key>frozen_bit_positions</key>
+    <type>int_vector</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Values</name>
+    <key>frozen_bit_values</key>
+    <type>int_vector</type>
+  </param>
+</block>
diff --git a/gr-fec/grc/variable_polar_decoder_sc_list.xml b/gr-fec/grc/variable_polar_decoder_sc_list.xml
new file mode 100644
index 0000000000..2128110ad4
--- /dev/null
+++ b/gr-fec/grc/variable_polar_decoder_sc_list.xml
@@ -0,0 +1,80 @@
+<?xml version="1.0"?>
+<block>
+  <name>POLAR Decoder SC List Definition</name>
+  <key>variable_polar_decoder_sc_list_def</key>
+  <import>from gnuradio import fec</import>
+  <var_make>#if int($ndim())==0 #
+self.$(id) = $(id) = fec.polar_decoder_sc_list.make($max_list_size, $block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values) #slurp
+#else if int($ndim())==1 #
+self.$(id) = $(id) = map((lambda a: fec.polar_decoder_sc_list.make($max_list_size, $block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)), range(0, $dim1)) #slurp
+#else
+self.$(id) = $(id) = map((lambda b: map((lambda a: fec.polar_decoder_sc_list.make($max_list_size, $block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)), range(0, $dim2))), range(0, $dim1)) #slurp
+#end if</var_make>
+  <var_value>fec.polar_decoder_sc_list.make($max_list_size, $block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values)</var_value>
+  <make></make>
+
+  <param>
+    <name>Parallelism</name>
+    <key>ndim</key>
+    <value>0</value>
+    <type>enum</type>
+    <option>
+      <name>0</name>
+      <key>0</key>
+    </option>
+    <option>
+      <name>1</name>
+      <key>1</key>
+    </option>
+    <option>
+      <name>2</name>
+      <key>2</key>
+      </option>
+  </param>
+
+  <param>
+    <name>Dimension 1</name>
+    <key>dim1</key>
+    <value>1</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 1) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Dimension 2</name>
+    <key>dim2</key>
+    <value>4</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 2) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Maximum List Size (L)</name>
+    <key>max_list_size</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>Block size (N)</name>
+    <key>block_size</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>#Info Bits (K)</name>
+    <key>num_info_bits</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Positions</name>
+    <key>frozen_bit_positions</key>
+    <type>int_vector</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Values</name>
+    <key>frozen_bit_values</key>
+    <type>int_vector</type>
+  </param>
+</block>
diff --git a/gr-fec/grc/variable_polar_encoder.xml b/gr-fec/grc/variable_polar_encoder.xml
new file mode 100644
index 0000000000..4147cf1edf
--- /dev/null
+++ b/gr-fec/grc/variable_polar_encoder.xml
@@ -0,0 +1,89 @@
+<?xml version="1.0"?>
+<block>
+  <name>POLAR Encoder Definition</name>
+  <key>variable_polar_encoder_def</key>
+  <import>from gnuradio import fec</import>
+  <var_make>#if int($ndim())==0 #
+self.$(id) = $(id) = fec.polar_encoder.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values, $is_packed) #slurp
+#else if int($ndim())==1 #
+self.$(id) = $(id) = map((lambda a: fec.polar_encoder.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values, $is_packed)), range(0, $dim1)) #slurp
+#else
+self.$(id) = $(id) = map((lambda b: map((lambda a: fec.polar_encoder.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values, $is_packed)), range(0, $dim2))), range(0, $dim1)) #slurp
+#end if</var_make>
+  <var_value>fec.polar_encoder.make($block_size, $num_info_bits, $frozen_bit_positions, $frozen_bit_values, $is_packed)</var_value>
+  <make></make>
+
+  <param>
+    <name>Packed Bits</name>
+    <key>is_packed</key>
+    <value>False</value>
+    <type>enum</type>
+    <option>
+      <name>No</name>
+      <key>False</key>
+    </option>
+    <option>
+      <name>Yes</name>
+      <key>True</key>
+    </option>
+  </param>
+
+  <param>
+    <name>Parallelism</name>
+    <key>ndim</key>
+    <value>0</value>
+    <type>enum</type>
+    <option>
+      <name>0</name>
+      <key>0</key>
+    </option>
+    <option>
+      <name>1</name>
+      <key>1</key>
+    </option>
+    <option>
+      <name>2</name>
+      <key>2</key>
+      </option>
+  </param>
+
+  <param>
+    <name>Dimension 1</name>
+    <key>dim1</key>
+    <value>1</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 1) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Dimension 2</name>
+    <key>dim2</key>
+    <value>4</value>
+    <type>int</type>
+    <hide>#if (int($ndim()) >= 2) then 'none' else 'all' #</hide>
+  </param>
+
+  <param>
+    <name>Block size (N)</name>
+    <key>block_size</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>#Info Bits (K)</name>
+    <key>num_info_bits</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Positions</name>
+    <key>frozen_bit_positions</key>
+    <type>int_vector</type>
+  </param>
+
+  <param>
+    <name>Frozen Bit Values</name>
+    <key>frozen_bit_values</key>
+    <type>int_vector</type>
+  </param>
+</block>
diff --git a/gr-fec/include/gnuradio/fec/CMakeLists.txt b/gr-fec/include/gnuradio/fec/CMakeLists.txt
index 9c13f783b4..10782250d7 100644
--- a/gr-fec/include/gnuradio/fec/CMakeLists.txt
+++ b/gr-fec/include/gnuradio/fec/CMakeLists.txt
@@ -47,6 +47,10 @@ install(FILES
     puncture_bb.h
     puncture_ff.h
     depuncture_bb.h
-    DESTINATION ${GR_INCLUDE_DIR}/gnuradio/fec
+    polar_encoder.h
+    polar_decoder_sc.h
+    polar_common.h
+    polar_decoder_sc_list.h
+    polar_decoder_common.h DESTINATION ${GR_INCLUDE_DIR}/gnuradio/fec
     COMPONENT "fec_devel"
 )
diff --git a/gr-fec/include/gnuradio/fec/polar_common.h b/gr-fec/include/gnuradio/fec/polar_common.h
new file mode 100644
index 0000000000..7ef3e59b77
--- /dev/null
+++ b/gr-fec/include/gnuradio/fec/polar_common.h
@@ -0,0 +1,106 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_FEC_POLAR_COMMON_H
+#define INCLUDED_FEC_POLAR_COMMON_H
+
+#include <gnuradio/fec/api.h>
+
+// Forward declaration for those objects. SWIG doesn't like them to be #include'd.
+namespace gr {
+  namespace blocks {
+    namespace kernel {
+      class unpack_k_bits;
+    }
+  }
+}
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      /*!
+       * \brief POLAR code common operations and attributes
+       * \ingroup error_coding_blk
+       *
+       * \details
+       * Polar codes are based on this paper by Erdal Arikan "Channel
+       * Polarization: A Method for Contructing Capacity-Achieving Codes
+       * for Symmetric Binary-Input Memoryless Channels", 2009 block
+       * holds common information for encoders and decoders. All polar
+       * encoder/decoders inherit from polar_common.
+       *
+       * class holds common info. It is common to all encoders and decoders.
+       */
+      class FEC_API polar_common
+      {
+      public:
+        /*!
+         * \param block_size codeword size. MUST be a power of 2.
+         * \param num_info_bits represents the number of information
+         *        bits in a block. Also called frame_size. <= block_size
+         * \param frozen_bit_positions is an integer vector which
+         *        defines the position of all frozen bits in a block.
+         *        Its size MUST be equal to block_size - num_info_bits.
+         *        Also it must be sorted and every position must only
+         *        occur once.
+         * \param frozen_bit_values holds an unpacked byte for every
+         *        frozen bit position.  It defines if a frozen bit is
+         *        fixed to '0' or '1'. Defaults to all ZERO.
+         */
+        polar_common(int block_size, int num_info_bits,
+                     std::vector<int> frozen_bit_positions,
+                     std::vector<char> frozen_bit_values);
+        ~polar_common();
+
+      protected:
+        const int block_size()const {return d_block_size;};
+        const int block_power()const {return d_block_power;};
+        const int num_info_bits() const {return d_num_info_bits;};
+
+        // helper functions
+        long bit_reverse(long value, int active_bits) const;
+        void print_packed_bit_array(const unsigned char* printed_array,
+                                    const int num_bytes) const;
+        void print_unpacked_bit_array(const unsigned char* bits,
+                                      const unsigned int num_bytes) const;
+
+        std::vector<int> d_frozen_bit_positions;
+        std::vector<char> d_frozen_bit_values;
+        std::vector<int> d_info_bit_positions;
+
+      private:
+        int d_block_size; // depending on paper called 'N' or 'm'
+        int d_block_power;
+        int d_num_info_bits; // mostly abbreviated by 'K'
+
+        void initialize_info_bit_position_vector();
+
+        gr::blocks::kernel::unpack_k_bits *d_unpacker; // convenience for 'print_packed_bit_array' function.
+      };
+
+    } //namespace code
+  } // namespace fec
+} // namespace gr
+
+#endif /* INCLUDED_FEC_POLAR_COMMON_H */
diff --git a/gr-fec/include/gnuradio/fec/polar_decoder_common.h b/gr-fec/include/gnuradio/fec/polar_decoder_common.h
new file mode 100644
index 0000000000..b0ecb85149
--- /dev/null
+++ b/gr-fec/include/gnuradio/fec/polar_decoder_common.h
@@ -0,0 +1,100 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_FEC_POLAR_DECODER_COMMON_H
+#define INCLUDED_FEC_POLAR_DECODER_COMMON_H
+
+#include <gnuradio/fec/api.h>
+#include <gnuradio/fec/generic_decoder.h>
+#include <gnuradio/fec/polar_common.h>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      /*!
+       * \brief Class holds common methods and attributes for different
+       * decoder implementations
+       */
+      class FEC_API polar_decoder_common : public generic_decoder, public polar_common
+      {
+      public:
+        /*!
+         *
+         * \param block_size codeword size. MUST be a power of 2.
+         * \param num_info_bits represents the number of information bits
+         *        in a block. Also called frame_size. <= block_size
+         * \param frozen_bit_positions is an integer vector which defines
+         *        the position of all frozen bits in a block.  Its size
+         *        MUST be equal to block_size - num_info_bits.  Also it
+         *        must be sorted and every position must only occur once.
+         * \param frozen_bit_values holds an unpacked byte for every
+         *        frozen bit position. It defines if a frozen bit is
+         *        fixed to '0' or '1'. Defaults to all ZERO.
+         */
+        polar_decoder_common(int block_size, int num_info_bits,
+                             std::vector<int> frozen_bit_positions,
+                             std::vector<char> frozen_bit_values);
+        ~polar_decoder_common();
+
+        // FECAPI
+        double rate(){return (1.0 * get_output_size() / get_input_size());};
+        int get_input_size(){return block_size();};
+        int get_output_size(){return num_info_bits();};
+        bool set_frame_size(unsigned int frame_size){return false;};
+
+      private:
+        static const float D_LLR_FACTOR = -2.19722458f;
+        unsigned int d_frozen_bit_counter;
+
+      protected:
+        // calculate LLRs for stage
+        float llr_odd(const float la, const float lb) const;
+        float llr_even(const float la, const float lb, const unsigned char f) const;
+        unsigned char llr_bit_decision(const float llr) const {return (llr < 0.0f) ? 1 : 0;};
+
+        // control retrieval of frozen bits.
+        const bool is_frozen_bit(const int u_num) const;
+        const unsigned char next_frozen_bit();
+
+        // preparation for decoding
+        void initialize_decoder(unsigned char* u, float* llrs, const float* input);
+
+        // basic algorithm methods
+        void butterfly(float* llrs, unsigned char* u, const int stage, const int u_num, const int row);
+        void butterfly_volk(float* llrs, unsigned char* u, const int stage, const int u_num, const int row);
+        void butterfly_generic(float* llrs, unsigned char* u, const int stage, const int u_num, const int row);
+        void even_u_values(unsigned char* u_even, const unsigned char* u, const int u_num);
+        void odd_xor_even_values(unsigned char* u_xor, const unsigned char* u, const int u_num);
+        void extract_info_bits(unsigned char* output, const unsigned char* input) const;
+
+        // helper functions.
+        void print_pretty_llr_vector(const float* llr_vec) const;
+
+      };
+
+    } // namespace code
+  } // namespace fec
+} // namespace gr
+
+#endif /* INCLUDED_FEC_POLAR_DECODER_COMMON_H */
diff --git a/gr-fec/include/gnuradio/fec/polar_decoder_sc.h b/gr-fec/include/gnuradio/fec/polar_decoder_sc.h
new file mode 100644
index 0000000000..3563a06574
--- /dev/null
+++ b/gr-fec/include/gnuradio/fec/polar_decoder_sc.h
@@ -0,0 +1,84 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_FEC_POLAR_DECODER_SC_H
+#define INCLUDED_FEC_POLAR_DECODER_SC_H
+
+#include <gnuradio/fec/api.h>
+#include <gnuradio/fec/polar_decoder_common.h>
+
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      /*!
+       * \brief Standard successive cancellation (SC) decoder for POLAR codes
+       *
+       * \details
+       * It expects float input with bits mapped 1 --> 1, 0 --> -1
+       * Or: f = 2.0 * bit - 1.0
+       *
+       */
+      class FEC_API polar_decoder_sc : public polar_decoder_common
+      {
+      public:
+
+        /*!
+         * \param block_size codeword size. MUST be a power of 2.
+         * \param num_info_bits represents the number of information
+         *        bits in a block. Also called frame_size. <= block_size
+         * \param frozen_bit_positions is an integer vector which
+         *        defines the position of all frozen bits in a block.
+         *        Its size MUST be equal to block_size - num_info_bits.
+         *        Also it must be sorted and every position must only
+         *        occur once.
+         * \param frozen_bit_values holds an unpacked byte for every
+         *        frozen bit position. It defines if a frozen bit is
+         *        fixed to '0' or '1'. Defaults to all ZERO.
+         */
+        static generic_decoder::sptr make(int block_size, int num_info_bits,
+                                          std::vector<int> frozen_bit_positions,
+                                          std::vector<char> frozen_bit_values);
+        ~polar_decoder_sc();
+
+        // FECAPI
+        void generic_work(void *in_buffer, void *out_buffer);
+
+      private:
+        polar_decoder_sc(int block_size, int num_info_bits,
+                         std::vector<int> frozen_bit_positions,
+                         std::vector<char> frozen_bit_values);
+
+        float* d_llr_vec;
+        unsigned char* d_u_hat_vec;
+
+        unsigned char retrieve_bit_from_llr(float llr, const int pos);
+        void sc_decode(float* llrs, unsigned char* u);
+      };
+
+    } // namespace code
+  } // namespace fec
+} // namespace gr
+
+#endif /* INCLUDED_FEC_POLAR_DECODER_SC_H */
diff --git a/gr-fec/include/gnuradio/fec/polar_decoder_sc_list.h b/gr-fec/include/gnuradio/fec/polar_decoder_sc_list.h
new file mode 100644
index 0000000000..12b896e824
--- /dev/null
+++ b/gr-fec/include/gnuradio/fec/polar_decoder_sc_list.h
@@ -0,0 +1,94 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_POLAR_FEC_DECODER_SC_LIST_H
+#define INCLUDED_POLAR_FEC_DECODER_SC_LIST_H
+
+#include <gnuradio/fec/api.h>
+#include <gnuradio/fec/polar_decoder_common.h>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      namespace polar {
+        class scl_list;
+        class path;
+      }
+
+      /*!
+       * \brief Successive cancellation list (SCL) decoder for polar
+       * codes.
+       *
+       * \details
+       * Decoder is based on Tal, Vardy "List Decoding of Polar Codes",
+       * 2012 LLR version: Balatsoukas-Stimming, Parizi, Burg "LLR-based
+       * Successive Cancellation List Decoding of Polar Codes", 2015.
+       *
+       * Block expects float input with bits mapped 1 --> 1, 0 --> -1
+       * Or: f = 2.0 * bit - 1.0
+       */
+      class FEC_API polar_decoder_sc_list : public polar_decoder_common
+      {
+      public:
+        /*!
+         * \param max_list_size caps number of followed decoding paths.
+         * \param block_size codeword size. MUST be a power of 2.
+         * \param num_info_bits represents the number of information
+         *        bits in a block. Also called frame_size. <= block_size
+         * \param frozen_bit_positions is an integer vector which
+         *        defines the position of all frozen bits in a block.
+         *        Its size MUST be equal to block_size - num_info_bits.
+         *        Also it must be sorted and every position must only
+         *        occur once.
+         * \param frozen_bit_values holds an unpacked byte for every
+         *        frozen bit position. It defines if a frozen bit is
+         *        fixed to '0' or '1'. Defaults to all ZERO.
+         */
+        static generic_decoder::sptr make(int max_list_size, int block_size,
+                                          int num_info_bits, std::vector<int> frozen_bit_positions,
+                                          std::vector<char> frozen_bit_values);
+        ~polar_decoder_sc_list();
+
+        // FECAPI
+        void generic_work(void *in_buffer, void *out_buffer);
+
+      private:
+        polar_decoder_sc_list(int max_list_size, int block_size,
+                              int num_info_bits, std::vector<int> frozen_bit_positions,
+                              std::vector<char> frozen_bit_values);
+
+        polar::scl_list* d_scl;
+
+        void initialize_list(const float* in_buf);
+        const unsigned char* decode_list();
+        void decode_bit(const int u_num);
+        void calculate_llrs_for_list(const int u_num);
+        void set_bit_in_list(const int u_num);
+      };
+
+    } // namespace code
+  } // namespace fec
+} // namespace gr
+
+#endif /* INCLUDED_POLAR_FEC_DECODER_SC_LIST_H */
diff --git a/gr-fec/include/gnuradio/fec/polar_encoder.h b/gr-fec/include/gnuradio/fec/polar_encoder.h
new file mode 100644
index 0000000000..f9541a203d
--- /dev/null
+++ b/gr-fec/include/gnuradio/fec/polar_encoder.h
@@ -0,0 +1,120 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_FEC_POLAR_ENCODER_H
+#define INCLUDED_FEC_POLAR_ENCODER_H
+
+#include <gnuradio/fec/api.h>
+#include <gnuradio/fec/generic_encoder.h>
+#include <gnuradio/fec/polar_common.h>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      /*!
+       * \brief POLAR encoder
+       * for basic details see 'polar_common' class.
+       * \ingroup error_coding_blk
+       *
+       * \details
+       * expects values with MSB first. It needs a full information word and encodes it in one pass.
+       * Output is a codeword of block_size.
+       */
+      class FEC_API polar_encoder : public generic_encoder, public polar_common
+      {
+      public:
+        /*!
+         * Factory for a polar code encoder object.
+         *
+         * \param block_size defines the codeword size. It MUST be a
+         *        power of 2.
+         * \param num_info_bits represents the number of information
+         *        bits in a block. Also called frame_size.
+         * \param frozen_bit_positions is an integer vector which
+         *        defines the position of all frozen bits in a block.
+         *        Its size MUST be equal to block_size - num_info_bits.
+         *        Also it must be sorted and every position must only
+         *        occur once.
+         * \param frozen_bit_values holds an unpacked byte for every
+         *        frozen bit position. It defines if a frozen bit is
+         *        fixed to '0' or '1'. Defaults to all ZERO.
+         * \param is_packed choose 1 active bit/byte or 8 active
+         *        bit/byte. if false, VOLK polar encoder is used.
+         */
+        static generic_encoder::sptr make(int block_size, int num_info_bits,
+                                          std::vector<int> frozen_bit_positions,
+                                          std::vector<char> frozen_bit_values,
+                                          bool is_packed = false);
+        ~polar_encoder();
+
+        // FECAPI
+        void generic_work(void *in_buffer, void *out_buffer);
+        double rate(){return (1.0 * get_input_size() / get_output_size());};
+        int get_input_size(){return num_info_bits() / (d_is_packed ? 8 : 1);};
+        int get_output_size(){return block_size() / (d_is_packed ? 8 : 1);};
+        bool set_frame_size(unsigned int frame_size){return false;};
+        const char* get_input_conversion(){return d_is_packed ? "pack" : "none";};
+        const char* get_output_conversion(){return d_is_packed ? "packed_bits" : "none";};
+
+      private:
+        polar_encoder(int block_size, int num_info_bits,
+                      std::vector<int>& frozen_bit_positions,
+                      std::vector<char>& frozen_bit_values, bool is_packed);
+        std::vector<int> d_info_bit_reversed_positions;
+        bool d_is_packed;
+
+        // c'tor method for packed algorithm setup.
+        void setup_frozen_bit_inserter();
+
+        // methods insert input bits and frozen bits into packed array for encoding
+        unsigned char* d_frozen_bit_prototype; // packed frozen bits are written onto it and later copies are used.
+        void insert_packed_frozen_bits_and_reverse(unsigned char* target,
+                                                   const unsigned char* input) const;
+        void insert_unpacked_bit_into_packed_array_at_position(unsigned char* target,
+                                                               const unsigned char bit,
+                                                               const int pos) const;
+        void insert_packet_bit_into_packed_array_at_position(unsigned char* target,
+                                                             const unsigned char bit,
+                                                             const int target_pos,
+                                                             const int bit_pos) const;
+
+        // packed encoding methods
+        void encode_vector_packed(unsigned char* target) const;
+        void encode_vector_packed_subbyte(unsigned char* target) const;
+        void encode_packed_byte(unsigned char* target) const;
+        void encode_vector_packed_interbyte(unsigned char* target) const;
+
+        // VOLK methods
+        void setup_volk_vectors();
+        void volk_encode(unsigned char* out_buf, const unsigned char* in_buf);
+        unsigned char* d_temp;
+        unsigned char* d_frozen_bit_mask;
+        unsigned char* d_frozen_bits;
+      };
+
+    } // namespace code
+  } // namespace fec
+} // namespace gr
+
+#endif /* INCLUDED_FEC_POLAR_ENCODER_H */
diff --git a/gr-fec/lib/CMakeLists.txt b/gr-fec/lib/CMakeLists.txt
index 2c116fe726..0343ce3cfc 100644
--- a/gr-fec/lib/CMakeLists.txt
+++ b/gr-fec/lib/CMakeLists.txt
@@ -80,7 +80,13 @@ list(APPEND gnuradio_fec_sources
   alist.cc
   tpc_common.cc
   tpc_decoder.cc
-  tpc_encoder.cc 
+  tpc_encoder.cc
+  polar_encoder.cc
+  polar_decoder_sc.cc
+  polar_common.cc
+  polar_decoder_sc_list.cc
+  polar_decoder_common.cc
+  scl_list.cc
 )
 
 #Add Windows DLL resource file if using MSVC
diff --git a/gr-fec/lib/polar_common.cc b/gr-fec/lib/polar_common.cc
new file mode 100644
index 0000000000..ff78d3428e
--- /dev/null
+++ b/gr-fec/lib/polar_common.cc
@@ -0,0 +1,136 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/fec/polar_common.h>
+
+#include <gnuradio/blocks/pack_k_bits.h>
+#include <gnuradio/blocks/unpack_k_bits.h>
+
+#include <cmath>
+#include <stdexcept>
+#include <iostream>
+#include <vector>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      polar_common::polar_common(int block_size, int num_info_bits,
+                                 std::vector<int> frozen_bit_positions,
+                                 std::vector<char> frozen_bit_values) :
+        d_frozen_bit_positions(frozen_bit_positions), d_frozen_bit_values(frozen_bit_values),
+        d_block_size(block_size), d_block_power((int) log2(float(block_size))),
+        d_num_info_bits(num_info_bits)
+      {
+        if(pow(2, d_block_power) != d_block_size){
+          throw std::runtime_error("block_size MUST be a power of 2!");
+        }
+
+        unsigned int num_frozen_bits = d_block_size - d_num_info_bits;
+        if(num_frozen_bits != d_frozen_bit_positions.size()){
+          throw std::runtime_error(
+                                   "number of frozen bit positions must equal block_size - num_info_bits");
+        }
+
+        // According to papers frozen bits default to '0'.
+        while(d_frozen_bit_values.size() < num_frozen_bits){
+          d_frozen_bit_values.push_back(0);
+        }
+        initialize_info_bit_position_vector();
+
+        d_unpacker = new gr::blocks::kernel::unpack_k_bits(8);
+      }
+
+      void
+      polar_common::initialize_info_bit_position_vector()
+      {
+        int num_frozen_bit = 0;
+        int frozen_pos = d_frozen_bit_positions.at(num_frozen_bit);
+        for(int i = 0; i < d_block_size; i++) {
+          if(i != frozen_pos) {
+            d_info_bit_positions.push_back((int) i);
+          }
+          else {
+            num_frozen_bit++;
+            num_frozen_bit = std::min(num_frozen_bit, (int) (d_frozen_bit_positions.size() - 1));
+            frozen_pos = d_frozen_bit_positions.at(num_frozen_bit);
+          }
+        }
+
+        if((int) d_info_bit_positions.size() != num_info_bits()) {
+          throw std::runtime_error("polar_common: number of info bit positions MUST equal num_info_bits (K)!");
+        }
+      }
+
+      polar_common::~polar_common()
+      {
+        delete d_unpacker;
+      }
+
+      long
+      polar_common::bit_reverse(long value, int active_bits) const
+      {
+        long r = 0;
+        for(int i = 0; i < active_bits; i++) {
+          r <<= 1;
+          r |= value & 1;
+          value >>= 1;
+        }
+        return r;
+      }
+
+      void
+      polar_common::print_packed_bit_array(const unsigned char* printed_array,
+                                           const int num_bytes) const
+      {
+        int num_bits = num_bytes << 3;
+        unsigned char* temp = new unsigned char[num_bits];
+        d_unpacker->unpack(temp, printed_array, num_bytes);
+
+        std::cout << "[";
+        for(int i = 0; i < num_bits; i++) {
+          std::cout << (int) *(temp + i) << " ";
+        }
+        std::cout << "]" << std::endl;
+
+        delete [] temp;
+      }
+
+      void
+      polar_common::print_unpacked_bit_array(const unsigned char* bits,
+                                             const unsigned int num_bytes) const
+      {
+        std::cout << "( ";
+        for(unsigned int i = 0; i < num_bytes; i++){
+          std::cout << (int) *bits++ << ", ";
+        }
+        std::cout << ")" << std::endl;
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/polar_decoder_common.cc b/gr-fec/lib/polar_decoder_common.cc
new file mode 100644
index 0000000000..8fc2e37fb7
--- /dev/null
+++ b/gr-fec/lib/polar_decoder_common.cc
@@ -0,0 +1,193 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/fec/polar_decoder_common.h>
+#include <volk/volk.h>
+
+#include <cstdio>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      polar_decoder_common::polar_decoder_common(int block_size, int num_info_bits,
+                                                 std::vector<int> frozen_bit_positions,
+                                                 std::vector<char> frozen_bit_values) :
+        polar_common(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values),
+        d_frozen_bit_counter(0)
+      {
+      }
+
+      polar_decoder_common::~polar_decoder_common()
+      {
+      }
+
+      void
+      polar_decoder_common::initialize_decoder(unsigned char* u, float* llrs, const float* input)
+      {
+        volk_32f_s32f_multiply_32f(llrs + block_size() * block_power(), input, D_LLR_FACTOR, block_size());
+        memset(u, 0, sizeof(unsigned char) * block_size() * block_power());
+        d_frozen_bit_counter = 0;
+      }
+
+      float
+      polar_decoder_common::llr_odd(const float la, const float lb) const
+      {
+        return copysignf(1.0f, la) * copysignf(1.0f, lb) * std::min(fabs(la), fabs(lb));
+      }
+
+      float
+      polar_decoder_common::llr_even(const float la, const float lb, const unsigned char f) const
+      {
+        switch(f){
+        case 0:
+          return lb + la;
+        default:
+          return lb - la;
+        }
+      }
+
+      void
+      polar_decoder_common::butterfly(float* llrs, unsigned char* u, const int stage,
+                                      const int u_num, const int row)
+      {
+        butterfly_volk(llrs, u, stage, u_num, row);
+      }
+
+      void
+      polar_decoder_common::butterfly_generic(float* llrs, unsigned char* u, const int stage,
+                                              const int u_num, const int row)
+      {
+        const int next_stage = stage + 1;
+        const int half_stage_size = 0x01 << stage;
+        const int stage_size = half_stage_size << 1;
+        const bool is_upper_stage_half = row % stage_size < half_stage_size;
+
+        //      // this is a natural bit order impl
+        float* next_llrs = llrs + block_size(); // LLRs are stored in a consecutive array.
+        float* call_row_llr = llrs + row;
+
+        const int section = row - (row % stage_size);
+        const int jump_size = ((row % half_stage_size) << 1) % stage_size;
+
+        const int next_upper_row = section + jump_size;
+        const int next_lower_row = next_upper_row + 1;
+
+        const float* upper_right_llr_ptr = next_llrs + next_upper_row;
+        const float* lower_right_llr_ptr = next_llrs + next_lower_row;
+
+        if(!is_upper_stage_half){
+          const int u_pos = u_num >> stage;
+          const unsigned char f = u[u_pos - 1];
+          *call_row_llr = llr_even(*upper_right_llr_ptr, *lower_right_llr_ptr, f);
+          return;
+        }
+
+        if(block_power() > next_stage){
+          unsigned char* u_half = u + block_size();
+          odd_xor_even_values(u_half, u, u_num);
+          butterfly(next_llrs, u_half, next_stage, u_num, next_upper_row);
+
+          even_u_values(u_half, u, u_num);
+          butterfly(next_llrs, u_half, next_stage, u_num, next_lower_row);
+        }
+
+        *call_row_llr = llr_odd(*upper_right_llr_ptr, *lower_right_llr_ptr);
+      }
+
+      void
+      polar_decoder_common::butterfly_volk(float* llrs, unsigned char* u, const int stage,
+                                           const int u_num, const int row)
+      {
+        volk_32f_8u_polarbutterfly_32f(llrs, u, block_size(), block_power(), stage, u_num, row);
+      }
+
+
+      void
+      polar_decoder_common::even_u_values(unsigned char* u_even, const unsigned char* u,
+                                          const int u_num)
+      {
+        u++;
+        for(int i = 1; i < u_num; i += 2){
+          *u_even++ = *u;
+          u += 2;
+        }
+      }
+
+      void
+      polar_decoder_common::odd_xor_even_values(unsigned char* u_xor, const unsigned char* u,
+                                                const int u_num)
+      {
+        for(int i = 1; i < u_num; i += 2){
+          *u_xor++ = *u ^ *(u + 1);
+          u += 2;
+        }
+      }
+
+      const bool
+      polar_decoder_common::is_frozen_bit(const int u_num) const
+      {
+        return d_frozen_bit_counter < d_frozen_bit_positions.size() && u_num == d_frozen_bit_positions.at(d_frozen_bit_counter);
+      }
+
+
+      const unsigned char
+      polar_decoder_common::next_frozen_bit()
+      {
+        return d_frozen_bit_values[d_frozen_bit_counter++];
+      }
+
+      void
+      polar_decoder_common::extract_info_bits(unsigned char* output, const unsigned char* input) const
+      {
+        unsigned int frozenbit_num = 0;
+        for(int i = 0; i < block_size(); i++){
+          if(frozenbit_num < d_frozen_bit_positions.size() && d_frozen_bit_positions.at(frozenbit_num) == i){
+            frozenbit_num++;
+          }
+          else{
+            *output++ = *input;
+          }
+          input++;
+        }
+      }
+
+      void
+      polar_decoder_common::print_pretty_llr_vector(const float* llr_vec) const
+      {
+        for(int row = 0; row < block_size(); row++) {
+          std::cout << row << "->" << int(bit_reverse(row, block_power())) << ":\t";
+          for(int stage = 0; stage < block_power() + 1; stage++) {
+            printf("%+4.2f, ", llr_vec[(stage * block_size()) + row]);
+          }
+          std::cout << std::endl;
+        }
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/polar_decoder_sc.cc b/gr-fec/lib/polar_decoder_sc.cc
new file mode 100644
index 0000000000..c4ac8877ec
--- /dev/null
+++ b/gr-fec/lib/polar_decoder_sc.cc
@@ -0,0 +1,97 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/fec/polar_decoder_sc.h>
+#include <volk/volk.h>
+
+#include <cmath>
+#include <cstdio>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      generic_decoder::sptr
+      polar_decoder_sc::make(int block_size, int num_info_bits,
+                             std::vector<int> frozen_bit_positions,
+                             std::vector<char> frozen_bit_values)
+      {
+        return generic_decoder::sptr
+          (new polar_decoder_sc(block_size, num_info_bits,
+                                frozen_bit_positions,
+                                frozen_bit_values));
+      }
+
+      polar_decoder_sc::polar_decoder_sc(int block_size, int num_info_bits,
+                                         std::vector<int> frozen_bit_positions,
+                                         std::vector<char> frozen_bit_values) :
+        polar_decoder_common(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+      {
+        d_llr_vec = (float*) volk_malloc(sizeof(float) * block_size * (block_power() + 1), volk_get_alignment());
+        memset(d_llr_vec, 0, sizeof(float) * block_size * (block_power() + 1));
+        d_u_hat_vec = (unsigned char*) volk_malloc(block_size * (block_power() + 1), volk_get_alignment());
+        memset(d_u_hat_vec, 0, sizeof(unsigned char) * block_size * (block_power() + 1));
+      }
+
+      polar_decoder_sc::~polar_decoder_sc()
+      {
+        volk_free(d_llr_vec);
+        volk_free(d_u_hat_vec);
+      }
+
+      void
+      polar_decoder_sc::generic_work(void* in_buffer, void* out_buffer)
+      {
+        const float *in = (const float*) in_buffer;
+        unsigned char *out = (unsigned char*) out_buffer;
+
+        initialize_decoder(d_u_hat_vec, d_llr_vec, in);
+        sc_decode(d_llr_vec, d_u_hat_vec);
+        extract_info_bits(out, d_u_hat_vec);
+      }
+
+      void
+      polar_decoder_sc::sc_decode(float* llrs, unsigned char* u)
+      {
+        for(int i = 0; i < block_size(); i++){
+          butterfly(llrs, u, 0, i, i);
+          u[i] = retrieve_bit_from_llr(llrs[i], i);
+        }
+      }
+
+      unsigned char
+      polar_decoder_sc::retrieve_bit_from_llr(float llr, const int pos)
+      {
+        if(is_frozen_bit(pos)){
+          return next_frozen_bit();
+        }
+        return llr_bit_decision(llr);
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/polar_decoder_sc_list.cc b/gr-fec/lib/polar_decoder_sc_list.cc
new file mode 100644
index 0000000000..903b9413da
--- /dev/null
+++ b/gr-fec/lib/polar_decoder_sc_list.cc
@@ -0,0 +1,123 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/fec/polar_decoder_sc_list.h>
+#include <volk/volk.h>
+#include <scl_list.h>
+
+#include <cmath>
+#include <algorithm>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      generic_decoder::sptr
+      polar_decoder_sc_list::make(int max_list_size, int block_size, int num_info_bits,
+                                  std::vector<int> frozen_bit_positions,
+                                  std::vector<char> frozen_bit_values)
+      {
+        return generic_decoder::sptr
+          (new polar_decoder_sc_list(max_list_size, block_size, num_info_bits,
+                                     frozen_bit_positions,
+                                     frozen_bit_values));
+      }
+
+      polar_decoder_sc_list::polar_decoder_sc_list(int max_list_size, int block_size,
+                                                   int num_info_bits,
+                                                   std::vector<int> frozen_bit_positions,
+                                                   std::vector<char> frozen_bit_values)
+        : polar_decoder_common(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+      {
+        d_scl = new polar::scl_list(max_list_size, block_size, block_power());
+      }
+
+      polar_decoder_sc_list::~polar_decoder_sc_list()
+      {
+        delete d_scl;
+      }
+
+      void
+      polar_decoder_sc_list::generic_work(void* in_buffer, void* out_buffer)
+      {
+        const float *in = (const float*) in_buffer;
+        unsigned char *out = (unsigned char*) out_buffer;
+
+        initialize_list(in);
+        const unsigned char* temp = decode_list();
+        extract_info_bits(out, temp);
+      }
+
+      void
+      polar_decoder_sc_list::initialize_list(const float* in_buf)
+      {
+        polar::path* init_path = d_scl->initial_path();
+        initialize_decoder(init_path->u_vec, init_path->llr_vec, in_buf);
+      }
+
+      const unsigned char*
+      polar_decoder_sc_list::decode_list()
+      {
+        for(int u_num = 0; u_num < block_size(); u_num++){
+          decode_bit(u_num);
+        }
+        return d_scl->optimal_path()->u_vec;
+      }
+
+      void
+      polar_decoder_sc_list::decode_bit(const int u_num)
+      {
+        calculate_llrs_for_list(u_num);
+        set_bit_in_list(u_num);
+      }
+
+      void
+      polar_decoder_sc_list::calculate_llrs_for_list(const int u_num)
+      {
+        for(unsigned int i = 0; i < d_scl->active_size(); i++){
+          polar::path* current_path = d_scl->next_active_path();
+          butterfly(current_path->llr_vec, current_path->u_vec, 0, u_num, u_num);
+        }
+      }
+
+      void
+      polar_decoder_sc_list::set_bit_in_list(const int u_num)
+      {
+        // 1. if frozen bit, update with known value
+        if(is_frozen_bit(u_num)){
+          const unsigned char frozen_bit = next_frozen_bit();
+          d_scl->set_frozen_bit(frozen_bit, u_num);
+        }
+        // 2. info bit
+        else{
+          d_scl->set_info_bit(u_num);
+        }
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/polar_encoder.cc b/gr-fec/lib/polar_encoder.cc
new file mode 100644
index 0000000000..350f490487
--- /dev/null
+++ b/gr-fec/lib/polar_encoder.cc
@@ -0,0 +1,234 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/fec/polar_encoder.h>
+#include <cmath>
+#include <stdexcept>
+#include <volk/volk.h>
+
+#include <gnuradio/blocks/pack_k_bits.h>
+#include <gnuradio/blocks/unpack_k_bits.h>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+
+      generic_encoder::sptr
+      polar_encoder::make(int block_size, int num_info_bits,
+                          std::vector<int> frozen_bit_positions,
+                          std::vector<char> frozen_bit_values, bool is_packed)
+      {
+        return generic_encoder::sptr
+          (new polar_encoder(block_size, num_info_bits,
+                             frozen_bit_positions,
+                             frozen_bit_values,
+                             is_packed));
+      }
+
+      polar_encoder::polar_encoder(int block_size, int num_info_bits,
+                                   std::vector<int>& frozen_bit_positions,
+                                   std::vector<char>& frozen_bit_values, bool is_packed) :
+        polar_common(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values),
+        d_is_packed(is_packed)
+      {
+        setup_frozen_bit_inserter();
+        setup_volk_vectors();
+      }
+
+      void
+      polar_encoder::setup_frozen_bit_inserter()
+      {
+        d_frozen_bit_prototype = (unsigned char*) volk_malloc(block_size() >> 3,
+                                                              volk_get_alignment());
+        memset(d_frozen_bit_prototype, 0, block_size() >> 3);
+
+        for(unsigned int i = 0; i < d_frozen_bit_positions.size(); i++) {
+          int rev_pos = (int) bit_reverse((long) d_frozen_bit_positions.at(i), block_power());
+          unsigned char frozen_bit = (unsigned char) d_frozen_bit_values.at(i);
+          insert_unpacked_bit_into_packed_array_at_position(d_frozen_bit_prototype, frozen_bit,
+                                                            rev_pos);
+        }
+
+        for(unsigned int i = 0; i < d_info_bit_positions.size(); i++){
+          d_info_bit_reversed_positions.push_back((int) bit_reverse((long) d_info_bit_positions.at(i), block_power()));
+        }
+
+        if((int) d_info_bit_reversed_positions.size() != num_info_bits()) {
+          throw std::runtime_error("polar_encoder: number of info bit positions MUST equal num_info_bits (K)!");
+        }
+      }
+
+      void
+      polar_encoder::setup_volk_vectors()
+      {
+        int nfrozen = block_size() - num_info_bits();
+        d_temp = (unsigned char*) volk_malloc(sizeof(unsigned char) * block_size(), volk_get_alignment());
+        d_frozen_bit_mask = (unsigned char*) volk_malloc(sizeof(unsigned char) * block_size(), volk_get_alignment());
+        d_frozen_bits = (unsigned char*) volk_malloc(sizeof(unsigned char) * nfrozen, volk_get_alignment());
+        for(int i = 0; i < nfrozen; i++){
+          d_frozen_bits[i] = d_frozen_bit_values[i];
+        }
+
+        int nfbit = 0;
+        for(int i = 0; i < block_size(); i++){
+          unsigned char m = 0x00;
+          if(d_frozen_bit_positions[nfbit] == i){
+            m = 0xFF;
+            nfbit++;
+          }
+          d_frozen_bit_mask[i] = m;
+        }
+      }
+
+      polar_encoder::~polar_encoder()
+      {
+        volk_free(d_frozen_bit_prototype);
+
+        volk_free(d_temp);
+        volk_free(d_frozen_bit_mask);
+        volk_free(d_frozen_bits);
+      }
+
+      void
+      polar_encoder::generic_work(void* in_buffer, void* out_buffer)
+      {
+        const unsigned char *in = (const unsigned char*) in_buffer;
+        unsigned char *out = (unsigned char*) out_buffer;
+
+        if(d_is_packed){
+          insert_packed_frozen_bits_and_reverse(out, in);
+          encode_vector_packed(out);
+        }
+        else{
+          volk_encode(out, in);
+        }
+      }
+
+      void
+      polar_encoder::volk_encode(unsigned char* out_buf, const unsigned char* in_buf)
+      {
+        volk_8u_x3_encodepolar_8u_x2(out_buf, d_temp, d_frozen_bit_mask, d_frozen_bits, in_buf, block_size());
+      }
+
+      void
+      polar_encoder::encode_vector_packed(unsigned char* target) const
+      {
+        encode_vector_packed_subbyte(target);
+        encode_vector_packed_interbyte(target);
+      }
+
+      void
+      polar_encoder::encode_vector_packed_subbyte(unsigned char* target) const
+      {
+        int num_bytes_per_block = block_size() >> 3;
+        while(num_bytes_per_block) {
+          encode_packed_byte(target);
+          ++target;
+          --num_bytes_per_block;
+        }
+      }
+
+      void
+      polar_encoder::encode_packed_byte(unsigned char* target) const
+      {
+        // this method only produces correct results if block_size > 4.
+        // this is assumed to be the case.
+        *target ^= 0xaa & (*target << 1);
+        *target ^= 0xcc & (*target << 2);
+        *target ^= *target << 4;
+      }
+
+      void
+      polar_encoder::encode_vector_packed_interbyte(unsigned char* target) const
+      {
+        int branch_byte_size = 1;
+        unsigned char* pos;
+        int n_branches = block_size() >> 4;
+        int byte = 0;
+        for(int stage = 3; stage < block_power(); ++stage) {
+          pos = target;
+
+          for(int branch = 0; branch < n_branches; ++branch) {
+
+            byte = 0;
+            while(byte < branch_byte_size) {
+              *pos ^= *(pos + branch_byte_size);
+              ++pos;
+              ++byte;
+            }
+
+            pos += branch_byte_size;
+          }
+
+          n_branches >>= 1;
+          branch_byte_size <<= 1;
+        }
+      }
+
+      void
+      polar_encoder::insert_packed_frozen_bits_and_reverse(unsigned char* target,
+                                                           const unsigned char* input) const
+      {
+        memcpy(target, d_frozen_bit_prototype, block_size() >> 3);
+        const int* info_bit_reversed_positions_ptr = &d_info_bit_reversed_positions[0];
+        int bit_num = 0;
+        unsigned char byte = *input;
+        int bit_pos;
+        while(bit_num < num_info_bits()) {
+          bit_pos = *info_bit_reversed_positions_ptr++;
+          insert_packet_bit_into_packed_array_at_position(target, byte, bit_pos, bit_num % 8);
+          ++bit_num;
+          if(bit_num % 8 == 0) {
+            ++input;
+            byte = *input;
+          }
+        }
+      }
+
+      void
+      polar_encoder::insert_unpacked_bit_into_packed_array_at_position(unsigned char* target,
+                                                                       const unsigned char bit,
+                                                                       const int pos) const
+      {
+        int byte_pos = pos >> 3;
+        int bit_pos = pos & 0x7;
+        *(target + byte_pos) ^= bit << (7 - bit_pos);
+      }
+
+      void
+      polar_encoder::insert_packet_bit_into_packed_array_at_position(unsigned char* target,
+                                                                     const unsigned char bit,
+                                                                     const int target_pos,
+                                                                     const int bit_pos) const
+      {
+        insert_unpacked_bit_into_packed_array_at_position(target, (bit >> (7 - bit_pos)) & 0x01,
+                                                          target_pos);
+      }
+
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/scl_list.cc b/gr-fec/lib/scl_list.cc
new file mode 100644
index 0000000000..ab6e81d317
--- /dev/null
+++ b/gr-fec/lib/scl_list.cc
@@ -0,0 +1,193 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <scl_list.h>
+#include <cstring>
+#include <iostream>
+#include <algorithm>
+#include <volk/volk.h>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+      namespace polar {
+
+        scl_list::scl_list(const unsigned int size,
+                           const unsigned int block_size,
+                           const unsigned int block_power):
+          d_list_size(size), d_block_size(block_size), d_block_power(block_power),
+          d_num_buff_elements(block_size * (block_power + 1))
+        {
+          for(unsigned int i = 0; i < 2 * size; i++){
+            d_path_list.push_back(new path());
+          }
+
+          for(unsigned int i = 0; i < size; i++){
+            d_path_list[i]->llr_vec = (float*) volk_malloc(sizeof(float) * d_num_buff_elements, volk_get_alignment());
+            memset(d_path_list[i]->llr_vec, 0, sizeof(float) * d_num_buff_elements);
+            d_path_list[i]->u_vec = (unsigned char*) volk_malloc(sizeof(unsigned char) * d_num_buff_elements, volk_get_alignment());
+            memset(d_path_list[i]->u_vec, 0, sizeof(unsigned char) * d_num_buff_elements);
+            d_path_list[i]->owns_vectors = true;
+          }
+
+          d_path_list[0]->is_active = true;
+          d_active_path_counter = 1;
+          d_active_pos = 0;
+        }
+
+        scl_list::~scl_list()
+        {
+          for(unsigned int i = 0; i < d_path_list.size(); i++){
+            delete d_path_list[i];
+          }
+        }
+
+
+        const path*
+        scl_list::optimal_path()
+        {
+          const path* temp = *std::min_element(d_path_list.begin(), d_path_list.begin() + d_active_path_counter, path_compare);
+          reset();
+          return temp;
+        }
+
+        void
+        scl_list::reset()
+        {
+          // leave 0th element active for next iteration
+          d_path_list[0]->path_metric = 0.0f;
+          for(unsigned int i = 1; i < d_path_list.size(); i++){
+            d_path_list[i]->is_active = false;
+            d_path_list[i]->path_metric = 0.0f;
+          }
+          d_active_path_counter = 1;
+          d_active_pos = 0;
+        }
+
+        void
+        scl_list::set_info_bit(const int bit_pos)
+        {
+          if(d_active_path_counter < d_list_size) {
+            const int offset = d_active_path_counter;
+            for(int i = 0; i < offset; i++) {
+              duplicate_path(d_path_list[i + offset], d_path_list[i]);
+              d_path_list[i]->path_metric = update_path_metric(d_path_list[i]->path_metric,
+                                                               d_path_list[i]->llr_vec[bit_pos], 0);
+              d_path_list[i + offset]->path_metric = update_path_metric
+                (d_path_list[i + offset]->path_metric, d_path_list[i + offset]->llr_vec[bit_pos], 1);
+              d_path_list[i]->u_vec[bit_pos] = 0;
+              d_path_list[i + offset]->u_vec[bit_pos] = 1;
+            }
+          }
+          else {
+
+            for(unsigned int i = 0; i < d_list_size; i++) {
+              branch_paths(d_path_list[i + d_list_size], d_path_list[i], d_path_list[i]->llr_vec[bit_pos]);
+            }
+            std::sort(d_path_list.begin(), d_path_list.end(), path_compare);
+
+            for(unsigned int i = 0; i < d_list_size; i++) {
+              if(!d_path_list[i]->owns_vectors) {
+                int t_pos = d_list_size;
+                while(!d_path_list[t_pos]->owns_vectors) {
+                  t_pos++;
+                }
+                steal_vector_ownership(d_path_list[i], d_path_list[t_pos]);
+                d_path_list[i]->u_vec[bit_pos] = 1;
+              }
+              else{
+                d_path_list[i]->u_vec[bit_pos] = 0;
+              }
+            }
+          }
+          d_active_pos = 0;
+        }
+
+        void
+        scl_list::branch_paths(path* target, path* original, const float llr)
+        {
+          target->path_metric = update_path_metric(original->path_metric, llr, 1);
+          original->path_metric = update_path_metric(original->path_metric, llr, 0);
+          target->llr_vec = original->llr_vec;
+          target->u_vec = original->u_vec;
+        }
+
+        void
+        scl_list::steal_vector_ownership(path* target, path* original)
+        {
+          memcpy(original->llr_vec, target->llr_vec, sizeof(float) * d_num_buff_elements);
+          memcpy(original->u_vec, target->u_vec, sizeof(unsigned char) * d_num_buff_elements);
+          target->llr_vec = original->llr_vec;
+          target->u_vec = original->u_vec;
+          target->owns_vectors = true;
+          original->owns_vectors = false;
+        }
+
+        void
+        scl_list::duplicate_path(path* target, const path* original)
+        {
+          memcpy(target->llr_vec, original->llr_vec, sizeof(float) * d_num_buff_elements);
+          memcpy(target->u_vec, original->u_vec, sizeof(unsigned char) * d_num_buff_elements);
+          target->path_metric = original->path_metric;
+          d_active_path_counter++;
+          target->is_active = true;
+        }
+
+        float
+        scl_list::update_path_metric(const float last_pm, const float llr,
+                                     const float ui) const
+        {
+          if((ui == 0 && llr > 0.0f) || (ui == 1 && llr < 0.0f)){
+            //        if(ui == (unsigned char) (0.5 * 1 - copysignf(1.0f, llr))){
+            return last_pm;
+          }
+          return last_pm + fabs(llr);
+        }
+
+        void
+        scl_list::set_frozen_bit(const unsigned char frozen_bit, const int bit_pos)
+        {
+          for(unsigned int i = 0; i < d_active_path_counter; i++){
+            d_path_list[i]->u_vec[bit_pos] = frozen_bit;
+            d_path_list[i]->path_metric = update_path_metric(d_path_list[i]->path_metric,
+                                                             d_path_list[i]->llr_vec[bit_pos],
+                                                             frozen_bit);
+          }
+          d_active_pos = 0;
+        }
+
+        path::path():
+          path_metric(0.0f), owns_vectors(false), is_active(false), llr_vec(NULL), u_vec(NULL)
+        {
+        }
+
+        path::~path(){
+          if(owns_vectors){
+            volk_free(llr_vec);
+            volk_free(u_vec);
+          }
+        }
+
+      } /* namespace polar */
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
diff --git a/gr-fec/lib/scl_list.h b/gr-fec/lib/scl_list.h
new file mode 100644
index 0000000000..8f3fa66ac1
--- /dev/null
+++ b/gr-fec/lib/scl_list.h
@@ -0,0 +1,87 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2015 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_FEC_SCL_LIST_H
+#define INCLUDED_FEC_SCL_LIST_H
+
+#include <vector>
+
+namespace gr {
+  namespace fec {
+    namespace code {
+      namespace polar {
+
+        struct path {
+          path();
+          ~path();
+          float path_metric;
+          bool owns_vectors;
+          bool is_active;
+          float* llr_vec;
+          unsigned char* u_vec;
+        };
+
+        /*!
+         * \brief List implementation for Successive Cancellation List decoders
+         *
+         */
+        class scl_list{
+          const unsigned int d_list_size;
+          const unsigned int d_block_size;
+          const unsigned int d_block_power;
+          const unsigned int d_num_buff_elements;
+          std::vector<path*> d_path_list;
+          unsigned int d_active_path_counter;
+          unsigned int d_active_pos;
+
+          float update_path_metric(const float last_pm, const float llr, const float ui) const;
+          void duplicate_path(path* target, const path* original);
+          void branch_paths(path* target, path* original, const float llr);
+          void steal_vector_ownership(path* target, path* original);
+          void reset();
+
+          // comparator for std::sort
+          static bool path_compare(path* first, path* second) {
+            return first->path_metric < second->path_metric;
+          };
+
+        public:
+          scl_list(const unsigned int list_size, const unsigned int block_size,
+                   const unsigned int block_power);
+          virtual
+          ~scl_list();
+          const unsigned int size() const {return d_list_size;};
+          const unsigned int active_size() const {return d_active_path_counter;};
+
+          path* initial_path() const {return d_path_list[0];};
+          path* next_active_path(){return d_path_list[d_active_pos++];};
+          void set_frozen_bit(const unsigned char frozen_bit, const int bit_pos);
+          void set_info_bit(const int bit_pos);
+          const path* optimal_path();
+        };
+
+      } /* namespace polar */
+    } /* namespace code */
+  } /* namespace fec */
+} /* namespace gr */
+
+#endif /* INCLUDED_FEC_SCL_LIST_H */
diff --git a/gr-fec/python/fec/CMakeLists.txt b/gr-fec/python/fec/CMakeLists.txt
index 032816866d..d5bebd7638 100644
--- a/gr-fec/python/fec/CMakeLists.txt
+++ b/gr-fec/python/fec/CMakeLists.txt
@@ -39,6 +39,8 @@ GR_PYTHON_INSTALL(
     COMPONENT "fec_python"
 )
 
+add_subdirectory(polar)
+
 ########################################################################
 # Handle the unit tests
 ########################################################################
diff --git a/gr-fec/python/fec/polar/CMakeLists.txt b/gr-fec/python/fec/polar/CMakeLists.txt
new file mode 100644
index 0000000000..1362ce18bb
--- /dev/null
+++ b/gr-fec/python/fec/polar/CMakeLists.txt
@@ -0,0 +1,41 @@
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+
+########################################################################
+include(GrPython)
+
+GR_PYTHON_INSTALL(
+    FILES
+    __init__.py
+    channel_construction.py
+    channel_construction_bsc.py
+    channel_construction_bec.py
+    helper_functions.py
+    DESTINATION ${GR_PYTHON_DIR}/gnuradio/fec/polar
+    COMPONENT "fec_python"
+)
+
+GR_PYTHON_INSTALL(
+    PROGRAMS
+    polar_channel_construction
+    DESTINATION ${GR_RUNTIME_DIR}
+    COMPONENT "fec_python"
+)
+
+
diff --git a/gr-fec/python/fec/polar/README.md b/gr-fec/python/fec/polar/README.md
new file mode 100644
index 0000000000..d425e8650d
--- /dev/null
+++ b/gr-fec/python/fec/polar/README.md
@@ -0,0 +1,9 @@
+POLAR Code Python test functions module
+===========
+
+This directory contains all the necessary files for POLAR code testcode.
+It serves as a reference for C++ implementations.
+
+'polar_channel_construction' exposes functionality to calculate polar channels for different sizes.
+It may be used to calculate Bhattacharyya parameters once and store them in a file in '~/.gnuradio/polar'.
+Frozen bit positions are recalculated on every run.
+\ No newline at end of file
diff --git a/gr-fec/python/fec/polar/__init__.py b/gr-fec/python/fec/polar/__init__.py
new file mode 100644
index 0000000000..0b9c264a77
--- /dev/null
+++ b/gr-fec/python/fec/polar/__init__.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+
+# turn this folder into a Python module
+
+import channel_construction as cc
+from channel_construction_bec import bhattacharyya_bounds
+from helper_functions import is_power_of_two
+
+
+CHANNEL_TYPE_BSC = 'BSC'
+CHANNEL_TYPE_BEC = 'BEC'
+
+def get_z_params(is_prototype, channel, block_size, design_snr, mu):
+    print('POLAR code channel construction called with parameters channel={0}, blocksize={1}, design SNR={2}, mu={3}'.format(channel, block_size, design_snr, mu))
+    if not (channel == 'BSC' or channel == 'BEC'):
+        raise ValueError("channel is {0}, but only BEC and BSC are supported!".format(channel))
+    if not is_power_of_two(block_size):
+        raise ValueError("block size={0} is not a power of 2!".format(block_size))
+    if design_snr < -1.5917:
+        raise ValueError("design SNR={0} < -1.5917. MUST be greater!".format(design_snr))
+    if not mu > 0:
+        raise ValueError("mu={0} < 1. MUST be > 1!".format(mu))
+    if not is_prototype and channel == 'BSC':
+        z_params = cc.load_z_parameters(block_size, design_snr, mu)
+        print('Read Z-parameter file: {0}'.format(cc.default_dir() + cc.generate_filename(block_size, design_snr, mu)))
+        return z_params
+    return bhattacharyya_bounds(design_snr, block_size)
+
+
+def load_frozen_bits_info(is_prototype, channel, block_size, num_info_bits, design_snr, mu):
+    num_frozen_bits = block_size - num_info_bits
+    if not mu > 0:
+        mu = 2
+    z_params = get_z_params(is_prototype, channel, block_size, design_snr, mu)
+    data_set = {
+        'positions': cc.get_frozen_bit_indices_from_z_parameters(z_params, num_frozen_bits),
+        'values': [0, ] * num_frozen_bits,
+        'block_size': block_size,
+        'num_info_bits': num_info_bits,
+        'num_frozenbits': num_frozen_bits,
+        'design_snr': design_snr,
+        'channel': channel,
+        'mu': mu,
+        }
+    return data_set
diff --git a/gr-fec/python/fec/polar/bit_reversed_polar_encoding_scheme.svg b/gr-fec/python/fec/polar/bit_reversed_polar_encoding_scheme.svg
new file mode 100644
index 0000000000..84849c994e
--- /dev/null
+++ b/gr-fec/python/fec/polar/bit_reversed_polar_encoding_scheme.svg
@@ -0,0 +1,1160 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
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+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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diff --git a/gr-fec/python/fec/polar/channel_construction.py b/gr-fec/python/fec/polar/channel_construction.py
new file mode 100644
index 0000000000..a7f048c5b9
--- /dev/null
+++ b/gr-fec/python/fec/polar/channel_construction.py
@@ -0,0 +1,139 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+'''
+[0] Erdal Arikan: 'Channel Polarization: A Method for Constructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels', 2009
+foundational paper for polar codes.
+'''
+
+
+from channel_construction_bec import calculate_bec_channel_capacities
+from channel_construction_bec import design_snr_to_bec_eta
+from channel_construction_bec import bhattacharyya_bounds
+from channel_construction_bsc import tal_vardy_tpm_algorithm
+from helper_functions import *
+import matplotlib.pyplot as plt
+
+
+Z_PARAM_FIRST_HEADER_LINE = "Bhattacharyya parameters (Z-parameters) for a polar code"
+
+
+def get_frozen_bit_indices_from_capacities(chan_caps, nfrozen):
+    indexes = np.array([], dtype=int)
+    while indexes.size < nfrozen:
+        index = np.argmin(chan_caps)
+        indexes = np.append(indexes, index)
+        chan_caps[index] = 2.0  # make absolutely sure value is out of range!
+    return np.sort(indexes)
+
+
+def get_frozen_bit_indices_from_z_parameters(z_params, nfrozen):
+    indexes = np.array([], dtype=int)
+    while indexes.size < nfrozen:
+        index = np.argmax(z_params)
+        indexes = np.append(indexes, index)
+        z_params[index] = -1.0
+    return np.sort(indexes)
+
+
+def get_bec_frozen_indices(nblock, kfrozen, eta):
+    bec_caps = calculate_bec_channel_capacities(eta, nblock)
+    positions = get_frozen_bit_indices_from_capacities(bec_caps, kfrozen)
+    return positions
+
+
+def get_frozen_bit_mask(frozen_indices, block_size):
+    frozen_mask = np.zeros(block_size, dtype=int)
+    frozen_mask[frozen_indices] = 1
+    return frozen_mask
+
+
+def frozen_bit_positions(block_size, info_size, design_snr=0.0):
+    if not design_snr > -1.5917:
+        print('bad value for design_nsr, must be > -1.5917! default=0.0')
+        design_snr = 0.0
+    eta = design_snr_to_bec_eta(design_snr)
+    return get_bec_frozen_indices(block_size, block_size - info_size, eta)
+
+
+def generate_filename(block_size, design_snr, mu):
+    filename = "polar_code_z_parameters_N" + str(int(block_size))
+    filename += "_SNR" + str(float(design_snr)) + "_MU" + str(int(mu)) + ".polar"
+    return filename
+
+
+def default_dir():
+    dir_def = "~/.gnuradio/polar/"
+    import os
+    path = os.path.expanduser(dir_def)
+
+    try:
+        os.makedirs(path)
+    except OSError:
+        if not os.path.isdir(path):
+            raise
+    return path
+
+
+def save_z_parameters(z_params, block_size, design_snr, mu):
+    path = default_dir()
+    filename = generate_filename(block_size, design_snr, mu)
+    header = Z_PARAM_FIRST_HEADER_LINE + "\n"
+    header += "Channel construction method: Tal-Vardy algorithm\n"
+    header += "Parameters:\n"
+    header += "block_size=" + str(block_size) + "\n"
+    header += "design_snr=" + str(design_snr) + "\n"
+    header += "mu=" + str(mu)
+    np.savetxt(path + filename, z_params, header=header)
+
+
+def load_z_parameters(block_size, design_snr, mu):
+    path = default_dir()
+    filename = generate_filename(block_size, design_snr, mu)
+    full_file = path + filename
+    import os
+    if not os.path.isfile(full_file):
+        z_params = tal_vardy_tpm_algorithm(block_size, design_snr, mu)
+        save_z_parameters(z_params, block_size, design_snr, mu)
+    z_params = np.loadtxt(full_file)
+    return z_params
+
+
+def main():
+    np.set_printoptions(precision=3, linewidth=150)
+    print 'channel construction Bhattacharyya bounds by Arikan'
+    n = 10
+    m = 2 ** n
+    k = m // 2
+    design_snr = 0.0
+    mu = 32
+
+    z_params = load_z_parameters(m, design_snr, mu)
+    z_bounds = bhattacharyya_bounds(design_snr, m)
+    print(z_params[-10:])
+    plt.plot(z_params)
+    plt.plot(z_bounds)
+    plt.show()
+
+
+if __name__ == '__main__':
+    main()
+
+
diff --git a/gr-fec/python/fec/polar/channel_construction_bec.py b/gr-fec/python/fec/polar/channel_construction_bec.py
new file mode 100644
index 0000000000..f8f960dfe7
--- /dev/null
+++ b/gr-fec/python/fec/polar/channel_construction_bec.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import numpy as np
+import helper_functions as hf
+
+
+def bec_channel(eta):
+    '''
+    binary erasure channel (BEC)
+    for each y e Y
+    W(y|0) * W(y|1) = 0 or W(y|0) = W(y|1)
+    transistions are 1 -> 1 or 0 -> 0 or {0, 1} -> ? (erased symbol)
+    '''
+    # looks like BSC but should be interpreted differently.
+    w = np.array((1 - eta, eta, 1 - eta), dtype=float)
+    return w
+
+
+def odd_rec(iwn):
+    return iwn ** 2
+
+
+def even_rec(iwn):
+    return 2 * iwn - iwn ** 2
+
+
+def calc_one_recursion(iw0):
+    iw1 = np.zeros(2 * len(iw0))  # double values
+    for i in range(len(iw0)):
+        # careful indices screw you because paper is '1' based :(
+        iw1[2 * i] = odd_rec(iw0[i])
+        iw1[2 * i + 1] = even_rec(iw0[i])
+    return iw1
+
+
+def calculate_bec_channel_capacities(eta, block_size):
+    # compare [0, Arikan] eq. 6
+    iw = 1 - eta  # holds for BEC as stated in paper
+    iw = np.array([iw, ], dtype=float)
+    lw = hf.power_of_2_int(block_size)
+    for i in range(lw):
+        iw = calc_one_recursion(iw)
+    return iw
+
+
+def calculate_z_parameters_one_recursion(z_params):
+    z_next = np.zeros(2 * z_params.size)
+    for i in range(z_params.size):
+        z_sq = z_params[i] ** 2
+        z_next[2 * i] = 2 * z_params[i] - z_sq
+        z_next[2 * i + 1] = z_sq
+    return z_next
+
+
+def calculate_bec_channel_z_parameters(eta, block_size):
+    # compare [0, Arikan] eq. 38
+    block_power = hf.power_of_2_int(block_size)
+    z_params = np.array([eta, ], dtype=float)
+    for block_size in range(block_power):
+        z_params = calculate_z_parameters_one_recursion(z_params)
+    return z_params
+
+
+def design_snr_to_bec_eta(design_snr):
+    s = 10. ** (design_snr / 10.)
+    return np.exp(-s)
+
+
+def bhattacharyya_bounds(design_snr, block_size):
+    '''
+    Harish Vangala, Emanuele Viterbo, Yi Hong: 'A Comparative Study of Polar Code Constructions for the AWGN Channel', 2015
+    In this paper it is called Bhattacharyya bounds channel construction and is abbreviated PCC-0
+    Best design SNR for block_size = 2048, R = 0.5, is 0dB.
+    Compare with Arikan: 'Channel Polarization: A Method for Constructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels.
+    Proposition 5. inequalities turn into equalities for BEC channel. Otherwise they represent an upper bound.
+    Also compare [0, Arikan] eq. 6 and 38
+    For BEC that translates to capacity(i) = 1 - bhattacharyya(i)
+    :return Z-parameters in natural bit-order. Choose according to desired rate.
+    '''
+    # minimum design snr = -1.5917 corresponds to BER = 0.5
+    s = 10 ** (design_snr / 10)  # 'initial z parameter'.
+    eta = np.exp(-s)
+    return calculate_bec_channel_z_parameters(eta, block_size)
+
+
+def main():
+    print 'channel construction main'
+    n = 10
+    block_size = 2 ** n
+    design_snr = 1.0
+    eta = design_snr_to_bec_eta(design_snr)
+    print(calculate_bec_channel_z_parameters(eta, block_size))
+    print(calculate_bec_channel_capacities(eta, block_size))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-fec/python/fec/polar/channel_construction_bsc.py b/gr-fec/python/fec/polar/channel_construction_bsc.py
new file mode 100755
index 0000000000..e16813fcb7
--- /dev/null
+++ b/gr-fec/python/fec/polar/channel_construction_bsc.py
@@ -0,0 +1,280 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+'''
+Based on 2 papers:
+[1] Ido Tal, Alexander Vardy: 'How To Construct Polar Codes', 2013
+for an in-depth description of a widely used algorithm for channel construction.
+
+[2] Harish Vangala, Emanuele Viterbo, Yi Hong: 'A Comparative Study of Polar Code Constructions for the AWGN Channel', 2015
+for an overview of different approaches
+'''
+
+
+from scipy.optimize import fsolve
+from scipy.special import erfc
+from helper_functions import *
+import matplotlib.pyplot as plt
+from channel_construction_bec import bhattacharyya_bounds
+
+
+def bsc_channel(p):
+    '''
+    binary symmetric channel (BSC)
+    output alphabet Y = {0, 1} and
+    W(0|0) = W(1|1) and W(1|0) = W(0|1)
+
+    this function returns a prob's vector for a BSC
+    p denotes an erroneous transistion
+    '''
+    if not (p >= 0.0 and p <= 1.0):
+        print "given p is out of range!"
+        return np.array([], dtype=float)
+
+    # 0 -> 0, 0 -> 1, 1 -> 0, 1 -> 1
+    W = np.array([[1 - p, p], [p, 1 - p]], dtype=float)
+    return W
+
+
+def solver_equation(val, s):
+    cw_lambda = codeword_lambda_callable(s)
+    ic_lambda = instantanious_capacity_callable()
+    return lambda y: ic_lambda(cw_lambda(y)) - val
+
+
+def solve_capacity(a, s):
+    eq = solver_equation(a, s)
+    res = fsolve(eq, 1)
+    return np.abs(res[0])  # only positive values needed.
+
+
+def codeword_lambda_callable(s):
+    return lambda y: np.exp(-2 * y * np.sqrt(2 * s))
+
+
+def codeword_lambda(y, s):
+    return codeword_lambda_callable(s)(y)
+
+
+def instantanious_capacity_callable():
+    return lambda x : 1 - np.log2(1 + x) + (x * np.log2(x) / (1 + x))
+
+
+def instantanious_capacity(x):
+    return instantanious_capacity_callable()(x)
+
+
+def q_function(x):
+    # Q(x) = (1 / sqrt(2 * pi) ) * integral (x to inf) exp(- x ^ 2 / 2) dx
+    return .5 * erfc(x / np.sqrt(2))
+
+
+def discretize_awgn(mu, design_snr):
+    '''
+    needed for Binary-AWGN channels.
+    in [1] described in Section VI
+    in [2] described as a function of the same name.
+    in both cases reduce infinite output alphabet to a finite output alphabet of a given channel.
+    idea:
+    1. instantaneous capacity C(x) in interval [0, 1]
+    2. split into mu intervals.
+    3. find corresponding output alphabet values y of likelihood ratio function lambda(y) inserted into C(x)
+    4. Calculate probability for each value given that a '0' or '1' is was transmitted.
+    '''
+    s = 10 ** (design_snr / 10)
+    a = np.zeros(mu + 1, dtype=float)
+    a[-1] = np.inf
+    for i in range(1, mu):
+        a[i] = solve_capacity(1. * i / mu, s)
+
+    factor = np.sqrt(2 * s)
+    tpm = np.zeros((2, mu))
+    for j in range(mu):
+        tpm[0][j] = q_function(factor + a[j]) - q_function(factor + a[j + 1])
+        tpm[1][j] = q_function(-1. * factor + a[j]) - q_function(-1. * factor + a[j + 1])
+    return tpm
+
+
+def instant_capacity_delta_callable():
+    return lambda a, b: -1. * (a + b) * np.log2((a + b) / 2) + a * np.log2(a) + b * np.log2(b)
+
+
+def capacity_delta_callable():
+    c = instant_capacity_delta_callable()
+    return lambda a, b, at, bt: c(a, b) + c(at, bt) - c(a + at, b + bt)
+
+
+def quantize_to_size(tpm, mu):
+    # This is a degrading merge, compare [1]
+    calculate_delta_I = capacity_delta_callable()
+    L = np.shape(tpm)[1]
+    if not mu < L:
+        print('WARNING: This channel gets too small!')
+
+    # lambda works on vectors just fine. Use Numpy vector awesomeness.
+    delta_i_vec = calculate_delta_I(tpm[0, 0:-1], tpm[1, 0:-1], tpm[0, 1:], tpm[1, 1:])
+
+    for i in range(L - mu):
+        d = np.argmin(delta_i_vec)
+        ap = tpm[0, d] + tpm[0, d + 1]
+        bp = tpm[1, d] + tpm[1, d + 1]
+        if d > 0:
+            delta_i_vec[d - 1] = calculate_delta_I(tpm[0, d - 1], tpm[1, d - 1], ap, bp)
+        if d < delta_i_vec.size - 1:
+            delta_i_vec[d + 1] = calculate_delta_I(ap, bp, tpm[0, d + 1], tpm[1, d + 1])
+        delta_i_vec = np.delete(delta_i_vec, d)
+        tpm = np.delete(tpm, d, axis=1)
+        tpm[0, d] = ap
+        tpm[1, d] = bp
+    return tpm
+
+
+def upper_bound_z_params(z, block_size, design_snr):
+    upper_bound = bhattacharyya_bounds(design_snr, block_size)
+    z = np.minimum(z, upper_bound)
+    return z
+
+
+def tal_vardy_tpm_algorithm(block_size, design_snr, mu):
+    block_power = power_of_2_int(block_size)
+    channels = np.zeros((block_size, 2, mu))
+    channels[0] = discretize_awgn(mu, design_snr) * 2
+
+    print('Constructing polar code with Tal-Vardy algorithm')
+    print('(block_size = {0}, design SNR = {1}, mu = {2}'.format(block_size, design_snr, mu))
+    show_progress_bar(0, block_size)
+    for j in range(0, block_power):
+        u = 2 ** j
+        for t in range(u):
+            show_progress_bar(u + t, block_size)
+            # print("(u={0}, t={1}) = {2}".format(u, t, u + t))
+            ch1 = upper_convolve(channels[t], mu)
+            ch2 = lower_convolve(channels[t], mu)
+            channels[t] = quantize_to_size(ch1, mu)
+            channels[u + t] = quantize_to_size(ch2, mu)
+
+    z = np.zeros(block_size)
+    for i in range(block_size):
+        # z[i] = np.sum(channels[i][1])
+        z[i] = bhattacharyya_parameter(channels[i])
+
+    z = z[bit_reverse_vector(np.arange(block_size), block_power)]
+    z = upper_bound_z_params(z, block_size, design_snr)
+    show_progress_bar(block_size, block_size)
+    print('')
+    print('channel construction DONE')
+    return z
+
+
+def merge_lr_based(q, mu):
+    lrs = q[0] / q[1]
+    vals, indices, inv_indices = np.unique(lrs, return_index=True, return_inverse=True)
+    # compare [1] (20). Ordering of representatives according to LRs.
+    temp = np.zeros((2, len(indices)), dtype=float)
+    if vals.size < mu:
+        return q
+    for i in range(len(indices)):
+        merge_pos = np.where(inv_indices == i)[0]
+        sum_items = q[:, merge_pos]
+        if merge_pos.size > 1:
+            sum_items = np.sum(q[:, merge_pos], axis=1)
+        temp[0, i] = sum_items[0]
+        temp[1, i] = sum_items[1]
+    return temp
+
+
+def upper_convolve(tpm, mu):
+    q = np.zeros((2, mu ** 2))
+    idx = -1
+    for i in range(mu):
+        idx += 1
+        q[0, idx] = (tpm[0, i] ** 2 + tpm[1, i] ** 2) / 2
+        q[1, idx] = tpm[0, i] * tpm[1, i]
+        for j in range(i + 1, mu):
+            idx += 1
+            q[0, idx] = tpm[0, i] * tpm[0, j] + tpm[1, i] * tpm[1, j]
+            q[1, idx] = tpm[0, i] * tpm[1, j] + tpm[1, i] * tpm[0, j]
+            if q[0, idx] < q[1, idx]:
+                q[0, idx], q[1, idx] = swap_values(q[0, idx], q[1, idx])
+
+    idx += 1
+    q = np.delete(q, np.arange(idx, np.shape(q)[1]), axis=1)
+    q = merge_lr_based(q, mu)
+    q = normalize_q(q, tpm)
+    return q
+
+
+def lower_convolve(tpm, mu):
+    q = np.zeros((2, mu * (mu + 1)))
+    idx = -1
+    for i in range(0, mu):
+        idx += 1
+        q[0, idx] = (tpm[0, i] ** 2) / 2
+        q[1, idx] = (tpm[1, i] ** 2) / 2
+        if q[0, idx] < q[1, idx]:
+            q[0, idx], q[1, idx] = swap_values(q[0, idx], q[1, idx])
+        idx += 1
+        q[0, idx] = tpm[0, i] * tpm[1, i]
+        q[1, idx] = q[0, idx]
+
+        for j in range(i + 1, mu):
+            idx += 1
+            q[0, idx] = tpm[0, i] * tpm[0, j]
+            q[1, idx] = tpm[1, i] * tpm[1, j]
+            if q[0, idx] < q[1, idx]:
+                q[0, idx], q[1, idx] = swap_values(q[0, idx], q[1, idx])
+            idx += 1
+            q[0, idx] = tpm[0, i] * tpm[1, j]
+            q[1, idx] = tpm[1, i] * tpm[0, j]
+            if q[0, idx] < q[1, idx]:
+                q[0, idx], q[1, idx] = swap_values(q[0, idx], q[1, idx])
+    idx += 1
+    q = np.delete(q, np.arange(idx, np.shape(q)[1]), axis=1)
+    q = merge_lr_based(q, mu)
+    q = normalize_q(q, tpm)
+    return q
+
+
+def swap_values(first, second):
+    return second, first
+
+
+def normalize_q(q, tpm):
+    original_factor = np.sum(tpm)
+    next_factor = np.sum(q)
+    factor = original_factor / next_factor
+    return q * factor
+
+
+def main():
+    print 'channel construction BSC main'
+    n = 8
+    m = 2 ** n
+    design_snr = 0.0
+    mu = 16
+
+    z_params = tal_vardy_tpm_algorithm(m, design_snr, mu)
+    print(z_params)
+    plt.plot(z_params)
+    plt.show()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-fec/python/fec/polar/common.py b/gr-fec/python/fec/polar/common.py
new file mode 100644
index 0000000000..b4b152de61
--- /dev/null
+++ b/gr-fec/python/fec/polar/common.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+
+import numpy as np
+from helper_functions import *
+
+'''
+PolarCommon holds value checks and common initializer code for both Encoder and Decoder.
+'''
+
+
+class PolarCommon:
+    def __init__(self, n, k, frozen_bit_position, frozenbits=None):
+        if not is_power_of_two(n):
+            raise ValueError("n={0} is not a power of 2!".format(n))
+        if frozenbits is None:
+            frozenbits = np.zeros(n - k, dtype=np.int)
+        if not len(frozenbits) == n - k:
+            raise ValueError("len(frozenbits)={0} is not equal to n-k={1}!".format(len(frozenbits), n - k))
+        if not frozenbits.dtype == np.int:
+            frozenbits = frozenbits.astype(dtype=int)
+        if not len(frozen_bit_position) == (n - k):
+            raise ValueError("len(frozen_bit_position)={0} is not equal to n-k={1}!".format(len(frozen_bit_position), n - k))
+        if not frozen_bit_position.dtype == np.int:
+            frozen_bit_position = frozen_bit_position.astype(dtype=int)
+
+        self.bit_reverse_positions = self._vector_bit_reversed(np.arange(n, dtype=int), int(np.log2(n)))
+        self.N = n
+        self.power = int(np.log2(self.N))
+        self.K = k
+        self.frozenbits = frozenbits
+        self.frozen_bit_position = frozen_bit_position
+        self.info_bit_position = np.delete(np.arange(self.N), self.frozen_bit_position)
+
+    def _insert_frozen_bits(self, u):
+        prototype = np.empty(self.N, dtype=int)
+        prototype[self.frozen_bit_position] = self.frozenbits
+        prototype[self.info_bit_position] = u
+        return prototype
+
+    def _extract_info_bits(self, y):
+        return y[self.info_bit_position]
+
+    def _reverse_bits(self, vec):
+        return vec[self.bit_reverse_positions]
+
+    def _vector_bit_reversed(self, vec, n):
+        return bit_reverse_vector(vec, n)
+
+    def info_print(self):
+        print "POLAR code ({0}, {1})".format(self.N, self.K)
diff --git a/gr-fec/python/fec/polar/decoder.py b/gr-fec/python/fec/polar/decoder.py
new file mode 100644
index 0000000000..10eef9b6ed
--- /dev/null
+++ b/gr-fec/python/fec/polar/decoder.py
@@ -0,0 +1,269 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import numpy as np
+from common import PolarCommon
+
+# for dev
+from encoder import PolarEncoder
+from matplotlib import pyplot as plt
+
+
+class PolarDecoder(PolarCommon):
+    def __init__(self, n, k, frozen_bit_position, frozenbits=None):
+        PolarCommon.__init__(self, n, k, frozen_bit_position, frozenbits)
+
+        self.error_probability = 0.1  # this is kind of a dummy value. usually chosen individually.
+        self.bsc_lr = ((1 - self.error_probability) / self.error_probability, self.error_probability / (1 - self.error_probability))
+        self.bsc_llrs = np.log(self.bsc_lr)
+
+    def _llr_bit(self, bit):
+        return self.bsc_llrs[bit]
+
+    def _llr_odd(self, la, lb):
+        # this functions uses the min-sum approximation
+        # exact formula: np.log((np.exp(la + lb) + 1) / (np.exp(la) + np.exp(lb)))
+        return np.sign(la) * np.sign(lb) * np.minimum(np.abs(la), np.abs(lb))
+
+    _f_vals = np.array((1.0, -1.0), dtype=float)
+
+    def _llr_even(self, la, lb, f):
+        return (la * self._f_vals[f]) + lb
+
+    def _llr_bit_decision(self, llr):
+        if llr < 0.0:
+            ui = int(1)
+        else:
+            ui = int(0)
+        return ui
+
+    def _retrieve_bit_from_llr(self, lr, pos):
+        f_index = np.where(self.frozen_bit_position == pos)[0]
+        if not f_index.size == 0:
+            ui = self.frozenbits[f_index][0]
+        else:
+            ui = self._llr_bit_decision(lr)
+        return ui
+
+    def _lr_bit(self, bit):
+        return self.bsc_lr[bit]
+
+    def _lr_odd(self, la, lb):
+        # la is upper branch and lb is lower branch
+        return (la * lb + 1) / (la + lb)
+
+    def _lr_even(self, la, lb, f):
+        # la is upper branch and lb is lower branch, f is last decoded bit.
+        return (la ** (1 - (2 * f))) * lb
+
+    def _lr_bit_decision(self, lr):
+        if lr < 1:
+            return int(1)
+        return int(0)
+
+    def _get_even_indices_values(self, u_hat):
+        # looks like overkill for some indexing, but zero and one based indexing mix-up gives you haedaches.
+        return u_hat[1::2]
+
+    def _get_odd_indices_values(self, u_hat):
+        return u_hat[0::2]
+
+    def _calculate_lrs(self, y, u):
+        ue = self._get_even_indices_values(u)
+        uo = self._get_odd_indices_values(u)
+        ya = y[0:y.size//2]
+        yb = y[(y.size//2):]
+        la = self._lr_decision_element(ya, (ue + uo) % 2)
+        lb = self._lr_decision_element(yb, ue)
+        return la, lb
+
+    def _lr_decision_element(self, y, u):
+        if y.size == 1:
+            return self._llr_bit(y[0])
+        if u.size % 2 == 0:  # use odd branch formula
+            la, lb = self._calculate_lrs(y, u)
+            return self._llr_odd(la, lb)
+        else:
+            ui = u[-1]
+            la, lb = self._calculate_lrs(y, u[0:-1])
+            return self._llr_even(la, lb, ui)
+
+    def _retrieve_bit_from_lr(self, lr, pos):
+        f_index = np.where(self.frozen_bit_position == pos)[0]
+        if not f_index.size == 0:
+            ui = self.frozenbits[f_index][0]
+        else:
+            ui = self._lr_bit_decision(lr)
+        return ui
+
+    def _lr_sc_decoder(self, y):
+        # this is the standard SC decoder as derived from the formulas. It sticks to natural bit order.
+        u = np.array([], dtype=int)
+        for i in range(y.size):
+            lr = self._lr_decision_element(y, u)
+            ui = self._retrieve_bit_from_llr(lr, i)
+            u = np.append(u, ui)
+        return u
+
+    def _llr_retrieve_bit(self, llr, pos):
+        f_index = np.where(self.frozen_bit_position == pos)[0]
+        if not f_index.size == 0:
+            ui = self.frozenbits[f_index][0]
+        else:
+            ui = self._llr_bit_decision(llr)
+        return ui
+
+    def _butterfly_decode_bits(self, pos, graph, u):
+        bit_num = u.size
+        llr = graph[pos][0]
+        ui = self._llr_retrieve_bit(llr, bit_num)
+        # ui = self._llr_bit_decision(llr)
+        u = np.append(u, ui)
+        lower_right = pos + (self.N // 2)
+        la = graph[pos][1]
+        lb = graph[lower_right][1]
+        graph[lower_right][0] = self._llr_even(la, lb, ui)
+        llr = graph[lower_right][0]
+        # ui = self._llr_bit_decision(llr)
+        ui = self._llr_retrieve_bit(llr, u.size)
+        u = np.append(u, ui)
+        return graph, u
+
+    def _lr_sc_decoder_efficient(self, y):
+        graph = np.full((self.N, self.power + 1), np.NaN, dtype=float)
+        for i in range(self.N):
+            graph[i][self.power] = self._llr_bit(y[i])
+        decode_order = self._vector_bit_reversed(np.arange(self.N), self.power)
+        decode_order = np.delete(decode_order, np.where(decode_order >= self.N // 2))
+        u = np.array([], dtype=int)
+        for pos in decode_order:
+            graph = self._butterfly(pos, 0, graph, u)
+            graph, u = self._butterfly_decode_bits(pos, graph, u)
+        return u
+
+    def _stop_propagation(self, bf_entry_row, stage):
+        # calculate break condition
+        modulus = 2 ** (self.power - stage)
+        # stage_size = self.N // (2 ** stage)
+        # half_stage_size = stage_size // 2
+        half_stage_size = self.N // (2 ** (stage + 1))
+        stage_pos = bf_entry_row % modulus
+        return stage_pos >= half_stage_size
+
+    def _butterfly(self, bf_entry_row, stage, graph, u):
+        if not self.power > stage:
+            return graph
+
+        if self._stop_propagation(bf_entry_row, stage):
+            upper_right = bf_entry_row - self.N // (2 ** (stage + 1))
+            la = graph[upper_right][stage + 1]
+            lb = graph[bf_entry_row][stage + 1]
+            ui = u[-1]
+            graph[bf_entry_row][stage] = self._llr_even(la, lb, ui)
+            return graph
+
+        # activate right side butterflies
+        u_even = self._get_even_indices_values(u)
+        u_odd = self._get_odd_indices_values(u)
+        graph = self._butterfly(bf_entry_row, stage + 1, graph, (u_even + u_odd) % 2)
+        lower_right = bf_entry_row + self.N // (2 ** (stage + 1))
+        graph = self._butterfly(lower_right, stage + 1, graph, u_even)
+
+        la = graph[bf_entry_row][stage + 1]
+        lb = graph[lower_right][stage + 1]
+        graph[bf_entry_row][stage] = self._llr_odd(la, lb)
+        return graph
+
+    def decode(self, data, is_packed=False):
+        if not len(data) == self.N:
+            raise ValueError("len(data)={0} is not equal to n={1}!".format(len(data), self.N))
+        if is_packed:
+            data = np.unpackbits(data)
+        data = self._lr_sc_decoder_efficient(data)
+        data = self._extract_info_bits(data)
+        if is_packed:
+            data = np.packbits(data)
+        return data
+
+
+def test_reverse_enc_dec():
+    n = 16
+    k = 8
+    frozenbits = np.zeros(n - k)
+    frozenbitposition = np.array((0, 1, 2, 3, 4, 5, 8, 9), dtype=int)
+    bits = np.random.randint(2, size=k)
+    encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+    decoder = PolarDecoder(n, k, frozenbitposition, frozenbits)
+    encoded = encoder.encode(bits)
+    print 'encoded:', encoded
+    rx = decoder.decode(encoded)
+    print 'bits:', bits
+    print 'rx  :', rx
+    print (bits == rx).all()
+
+
+def compare_decoder_impls():
+    print '\nthis is decoder test'
+    n = 8
+    k = 4
+    frozenbits = np.zeros(n - k)
+    # frozenbitposition16 = np.array((0, 1, 2, 3, 4, 5, 8, 9), dtype=int)
+    frozenbitposition = np.array((0, 1, 2, 4), dtype=int)
+    bits = np.random.randint(2, size=k)
+    print 'bits:', bits
+    encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+    decoder = PolarDecoder(n, k, frozenbitposition, frozenbits)
+    encoded = encoder.encode(bits)
+    print 'encoded:', encoded
+    rx_st = decoder._lr_sc_decoder(encoded)
+    rx_eff = decoder._lr_sc_decoder_efficient(encoded)
+    print 'standard :', rx_st
+    print 'efficient:', rx_eff
+    print (rx_st == rx_eff).all()
+
+
+def main():
+    power = 3
+    n = 2 ** power
+    k = 4
+    frozenbits = np.zeros(n - k, dtype=int)
+    frozenbitposition = np.array((0, 1, 2, 4), dtype=int)
+    frozenbitposition4 = np.array((0, 1), dtype=int)
+
+
+    encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+    decoder = PolarDecoder(n, k, frozenbitposition, frozenbits)
+
+    bits = np.ones(k, dtype=int)
+    print "bits: ", bits
+    evec = encoder.encode(bits)
+    print "froz: ", encoder._insert_frozen_bits(bits)
+    print "evec: ", evec
+
+    evec[1] = 0
+    deced = decoder._lr_sc_decoder(evec)
+    print 'SC decoded:', deced
+
+    test_reverse_enc_dec()
+    compare_decoder_impls()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-fec/python/fec/polar/encoder.py b/gr-fec/python/fec/polar/encoder.py
new file mode 100644
index 0000000000..3b5eea2a94
--- /dev/null
+++ b/gr-fec/python/fec/polar/encoder.py
@@ -0,0 +1,114 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import numpy as np
+from common import PolarCommon
+import helper_functions as hf
+
+
+class PolarEncoder(PolarCommon):
+    def __init__(self, n, k, frozen_bit_position, frozenbits=None):
+        PolarCommon.__init__(self, n, k, frozen_bit_position, frozenbits)
+        self.G = hf.get_Fn(n)
+
+    def get_gn(self):
+        return self.G
+
+    def _prepare_input_data(self, vec):
+        vec = self._insert_frozen_bits(vec)
+        vec = self._reverse_bits(vec)
+        return vec
+
+    def _encode_matrix(self, data):
+        data = np.dot(data, self.G) % 2
+        data = data.astype(dtype=int)
+        return data
+
+    def _encode_efficient(self, vec):
+        n_stages = int(np.log2(self.N))
+        pos = np.arange(self.N, dtype=int)
+        for i in range(n_stages):
+            splitted = np.reshape(pos, (2 ** (i + 1), -1))
+            upper_branch = splitted[0::2].flatten()
+            lower_branch = splitted[1::2].flatten()
+            vec[upper_branch] = (vec[upper_branch] + vec[lower_branch]) % 2
+        return vec
+
+    def encode(self, data, is_packed=False):
+        if not len(data) == self.K:
+            raise ValueError("len(data)={0} is not equal to k={1}!".format(len(data), self.K))
+        if is_packed:
+            data = np.unpackbits(data)
+        if np.max(data) > 1 or np.min(data) < 0:
+            raise ValueError("can only encode bits!")
+        data = self._prepare_input_data(data)
+        data = self._encode_efficient(data)
+        if is_packed:
+            data = np.packbits(data)
+        return data
+
+
+def compare_results(encoder, ntests, k):
+    for n in range(ntests):
+        bits = np.random.randint(2, size=k)
+        preped = encoder._prepare_input_data(bits)
+        menc = encoder._encode_matrix(preped)
+        fenc = encoder._encode_efficient(preped)
+        if (menc == fenc).all() == False:
+            return False
+    return True
+
+
+def test_pseudo_rate_1_encoder(encoder, ntests, k):
+    for n in range(ntests):
+        bits = np.random.randint(2, size=k)
+        u = encoder._prepare_input_data(bits)
+        fenc = encoder._encode_efficient(u)
+        u_hat = encoder._encode_efficient(fenc)
+        if not (u_hat == u).all():
+            print('rate-1 encoder/decoder failed')
+            print u
+            print u_hat
+            return False
+    return True
+
+
+def test_encoder_impls():
+    print('Compare encoder implementations, matrix vs. efficient')
+    ntests = 1000
+    n = 16
+    k = 8
+    frozenbits = np.zeros(n - k)
+    # frozenbitposition8 = np.array((0, 1, 2, 4), dtype=int)  # keep it!
+    frozenbitposition = np.array((0, 1, 2, 3, 4, 5, 8, 9), dtype=int)
+    encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+    print 'result:', compare_results(encoder, ntests, k)
+
+    print('Test rate-1 encoder/decoder chain results')
+    r1_test = test_pseudo_rate_1_encoder(encoder, ntests, k)
+    print 'Test rate-1 encoder/decoder:', r1_test
+
+
+def main():
+    test_encoder_impls()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-fec/python/fec/polar/helper_functions.py b/gr-fec/python/fec/polar/helper_functions.py
new file mode 100644
index 0000000000..ca66bf4a50
--- /dev/null
+++ b/gr-fec/python/fec/polar/helper_functions.py
@@ -0,0 +1,169 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import numpy as np
+import time, sys
+import copy
+
+
+def power_of_2_int(num):
+    return int(np.log2(num))
+
+
+def is_power_of_two(num):
+    if type(num) != int:
+        return False  # make sure we only compute integers.
+    return num != 0 and ((num & (num - 1)) == 0)
+
+
+def bit_reverse(value, n):
+    # is this really missing in NumPy???
+    seq = np.int(value)
+    rev = np.int(0)
+    rmask = np.int(1)
+    lmask = np.int(2 ** (n - 1))
+    for i in range(n // 2):
+        shiftval = n - 1 - (i * 2)
+        rshift = np.left_shift(np.bitwise_and(seq, rmask), shiftval)
+        lshift = np.right_shift(np.bitwise_and(seq, lmask), shiftval)
+        rev = np.bitwise_or(rev, rshift)
+        rev = np.bitwise_or(rev, lshift)
+        rmask = np.left_shift(rmask, 1)
+        lmask = np.right_shift(lmask, 1)
+    if not n % 2 == 0:
+        rev = np.bitwise_or(rev, np.bitwise_and(seq, rmask))
+    return rev
+
+
+def bit_reverse_vector(vec, n):
+    return np.array([bit_reverse(e, n) for e in vec], dtype=vec.dtype)
+
+
+def get_Bn(n):
+    # this is a bit reversal matrix.
+    lw = power_of_2_int(n)  # number of used bits
+    indexes = [bit_reverse(i, lw) for i in range(n)]
+    Bn = np.zeros((n, n), type(n))
+    for i, index in enumerate(indexes):
+        Bn[i][index] = 1
+    return Bn
+
+
+def get_Fn(n):
+    # this matrix defines the actual channel combining.
+    if n == 1:
+        return np.array([1, ])
+    nump = power_of_2_int(n) - 1  # number of Kronecker products to calculate
+    F2 = np.array([[1, 0], [1, 1]], np.int)
+    Fn = F2
+    for i in range(nump):
+        Fn = np.kron(Fn, F2)
+    return Fn
+
+
+def get_Gn(n):
+    # this matrix is called generator matrix
+    if not is_power_of_two(n):
+        print "invalid input"
+        return None
+    if n == 1:
+        return np.array([1, ])
+    Bn = get_Bn(n)
+    Fn = get_Fn(n)
+    Gn = np.dot(Bn, Fn)
+    return Gn
+
+
+def unpack_byte(byte, nactive):
+    if np.amin(byte) < 0 or np.amax(byte) > 255:
+        return None
+    if not byte.dtype == np.uint8:
+        byte = byte.astype(np.uint8)
+    if nactive == 0:
+        return np.array([], dtype=np.uint8)
+    return np.unpackbits(byte)[-nactive:]
+
+
+def pack_byte(bits):
+    if len(bits) == 0:
+        return 0
+    if np.amin(bits) < 0 or np.amax(bits) > 1:  # only '1' and '0' in bits array allowed!
+        return None
+    bits = np.concatenate((np.zeros(8 - len(bits), dtype=np.uint8), bits))
+    res = np.packbits(bits)[0]
+    return res
+
+
+def show_progress_bar(ndone, ntotal):
+    nchars = 50
+
+    fract = (1. * ndone / ntotal)
+    percentage = 100. * fract
+    ndone_chars = int(nchars * fract)
+    nundone_chars = nchars - ndone_chars
+    sys.stdout.write('\r[{0}{1}] {2:5.2f}% ({3} / {4})'.format('=' * ndone_chars, ' ' * nundone_chars, percentage, ndone, ntotal))
+
+
+
+def mutual_information(w):
+    '''
+    calculate mutual information I(W)
+    I(W) = sum over y e Y ( sum over x e X ( ... ) )
+    .5 W(y|x) log frac { W(y|x) }{ .5 W(y|0) + .5 W(y|1) }
+    '''
+    ydim, xdim = np.shape(w)
+    i = 0.0
+    for y in range(ydim):
+        for x in range(xdim):
+            v = w[y][x] * np.log2(w[y][x] / (0.5 * w[y][0] + 0.5 * w[y][1]))
+            i += v
+    i /= 2.0
+    return i
+
+
+def bhattacharyya_parameter(w):
+    '''bhattacharyya parameter is a measure of similarity between two prob. distributions'''
+    # sum over all y e Y for sqrt( W(y|0) * W(y|1) )
+    dim = np.shape(w)
+    ydim = dim[0]
+    z = 0.0
+    for y in range(ydim):
+        z += np.sqrt(w[0, y] * w[1, y])
+    # need all
+    return z
+
+
+def main():
+    print 'helper functions'
+
+    for i in range(9):
+        print(i, 'is power of 2: ', is_power_of_two(i))
+    n = 6
+    m = 2 ** n
+
+
+    pos = np.arange(m)
+    rev_pos = bit_reverse_vector(pos, n)
+    print(pos)
+    print(rev_pos)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-fec/python/fec/polar/polar_channel_construction b/gr-fec/python/fec/polar/polar_channel_construction
new file mode 100644
index 0000000000..0aca9c7ddc
--- /dev/null
+++ b/gr-fec/python/fec/polar/polar_channel_construction
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+""" A tool for POLAR code channel construction."""
+
+from optparse import OptionParser
+import gnuradio.fec.polar as cc
+
+
+def setup_parser():
+    """ Init the option parser. If derived classes need to add options,
+    override this and call the parent function. """
+    parser = OptionParser(add_help_option=False)
+    parser.usage = '%prog [blocksize] [designsnr] [mu]'
+
+    parser.add_option("-h", "--help", action="help", help="Displays this help message.")
+
+    parser.add_option("-c", "--channel", action="store", type="string", dest="channel",
+                      help="specify channel, currently BEC or BSC (default='BEC')", default='BEC')
+    parser.add_option("-b", "--blocksize", action="store", type="int", dest="block_size",
+                      help="specify block size of polar code (default=16)", default=16)
+    parser.add_option("-s", "--desgin-snr", action="store", type="float", dest="design_snr",
+                      help="specify design SNR of polar code (default=0.0)", default=0.0)
+    parser.add_option("-k", "--mu", action="store", type="int", dest="mu",
+                      help="specify block size of polar code (default=2)", default=2)
+
+    return parser
+
+
+def main():
+    """ Here we go. Parse command, choose class and run. """
+    print('POLAR code channel constructor commandline tool')
+    parser = setup_parser()
+    (options, args) = parser.parse_args()
+
+    channel = str(options.channel)
+    block_size = int(options.block_size)
+    design_snr = float(options.design_snr)
+    mu = int(options.mu)
+
+    if len(args) > 0:
+        channel = str(args[0])
+    if len(args) > 1:
+        block_size = int(args[1])
+    if len(args) > 2:
+        design_snr = float(args[2])
+    if len(args) == 4:
+        mu = int(args[3])
+
+    z_params = cc.get_z_params(False, channel, block_size, design_snr, mu)
+    print(z_params)
+
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass
diff --git a/gr-fec/python/fec/polar/testbed.py b/gr-fec/python/fec/polar/testbed.py
new file mode 100755
index 0000000000..d60c83e776
--- /dev/null
+++ b/gr-fec/python/fec/polar/testbed.py
@@ -0,0 +1,360 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+
+from encoder import PolarEncoder
+from decoder import PolarDecoder
+import channel_construction as cc
+from helper_functions import *
+
+import matplotlib.pyplot as plt
+
+
+def get_frozen_bit_position():
+    # frozenbitposition = np.array((0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 16, 17, 18, 20, 24), dtype=int)
+    # frozenbitposition = np.array((0, 1, 2, 3, 4, 5, 8, 9), dtype=int)
+    m = 256
+    n_frozen = m // 2
+    frozenbitposition = cc.get_frozen_bit_indices_from_z_parameters(cc.bhattacharyya_bounds(0.0, m), n_frozen)
+    print(frozenbitposition)
+    return frozenbitposition
+
+
+def test_enc_dec_chain():
+    ntests = 100
+    n = 256
+    k = n // 2
+    frozenbits = np.zeros(n - k)
+    frozenbitposition = get_frozen_bit_position()
+    for i in range(ntests):
+        bits = np.random.randint(2, size=k)
+        encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+        decoder = PolarDecoder(n, k, frozenbitposition, frozenbits)
+        encoded = encoder.encode(bits)
+        rx = decoder.decode(encoded)
+        if not is_equal(bits, rx):
+            raise ValueError('Test #', i, 'failed, input and output differ', bits, '!=', rx)
+            return
+
+
+def is_equal(first, second):
+    if not (first == second).all():
+        result = first == second
+        for i in range(len(result)):
+            print '{0:4}: {1:2} == {2:1} = {3}'.format(i, first[i], second[i], result[i])
+        return False
+    return True
+
+
+def exact_value(la, lb):
+    return np.log((np.exp(la + lb) + 1) / (np.exp(la) + np.exp(lb)))
+
+
+def approx_value(la, lb):
+    return np.sign(la) * np.sign(lb) * np.minimum(np.abs(la), np.abs(lb))
+
+
+def path_metric_exact(last_pm, llr, ui):
+    return last_pm + np.log(1 + np.exp(-1. * llr * (1 - 2 * ui)))
+
+
+def path_metric_approx(last_pm, llr, ui):
+    if ui == int(.5 * (1 - np.sign(llr))):
+        return last_pm
+    return last_pm + np.abs(llr)
+
+
+def calculate_path_metric_vector(metric, llrs, us):
+    res = np.zeros(llrs.size)
+    res[0] = metric(0, llrs[0], us[0])
+    for i in range(1, llrs.size):
+        res[i] = metric(res[i - 1], llrs[i], us[i])
+    return res
+
+
+def test_1024_rate_1_code():
+    # effectively a Monte-Carlo simulation for channel polarization.
+    ntests = 10000
+    n = 256
+    k = n
+    transition_prob = 0.11
+    num_transitions = int(k * transition_prob)
+    frozenbits = np.zeros(n - k)
+    frozenbitposition = np.array((), dtype=int)
+    encoder = PolarEncoder(n, k, frozenbitposition, frozenbits)
+    decoder = PolarDecoder(n, k, frozenbitposition, frozenbits)
+
+    channel_counter = np.zeros(k)
+    possible_indices = np.arange(n, dtype=int)
+    for i in range(ntests):
+        bits = np.random.randint(2, size=k)
+        tx = encoder.encode(bits)
+        np.random.shuffle(possible_indices)
+        tx[possible_indices[0:num_transitions]] = (tx[possible_indices[0:num_transitions]] + 1) % 2
+        rx = tx
+        recv = decoder.decode(rx)
+        channel_counter += (bits == recv)
+
+    print channel_counter
+    print(np.min(channel_counter), np.max(channel_counter))
+
+    np.save('channel_counter_' + str(ntests) + '.npy', channel_counter)
+
+
+def find_good_indices(res, nindices):
+    channel_counter = np.copy(res)
+    good_indices = np.zeros(channel_counter.size)
+
+    for i in range(nindices):
+        idx = np.argmax(channel_counter)
+        good_indices[idx] = 1
+        channel_counter[idx] = 0
+    return good_indices
+
+
+def channel_analysis():
+    ntests = 10000
+    filename = 'channel_counter_' + str(ntests) + '.npy'
+    channel_counter = np.load(filename)
+    print(np.min(channel_counter), np.max(channel_counter))
+    channel_counter[0] = np.min(channel_counter)
+    good_indices = find_good_indices(channel_counter, channel_counter.size // 2)
+    info_bit_positions = np.where(good_indices > 0)
+    print(info_bit_positions)
+    frozen_bit_positions = np.delete(np.arange(channel_counter.size), info_bit_positions)
+    print(frozen_bit_positions)
+    np.save('frozen_bit_positions_n256_k128_p0.11.npy', frozen_bit_positions)
+    good_indices *= 2000
+    good_indices += 4000
+
+    plt.plot(channel_counter)
+    plt.plot(good_indices)
+    plt.show()
+
+
+def merge_first_stage(init_mask):
+    merged_frozen_mask = []
+    for e in range(0, len(init_mask), 2):
+        v = [init_mask[e]['value'][0], init_mask[e + 1]['value'][0]]
+        s = init_mask[e]['size'] * 2
+        if init_mask[e]['type'] == init_mask[e + 1]['type']:
+            t = init_mask[e]['type']
+            merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+        else:
+            t = 'RPT'
+            merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+    return merged_frozen_mask
+
+
+def merge_second_stage(init_mask):
+    merged_frozen_mask = []
+    for e in range(0, len(init_mask), 2):
+        if init_mask[e]['type'] == init_mask[e + 1]['type']:
+            t = init_mask[e]['type']
+            v = init_mask[e]['value']
+            v.extend(init_mask[e + 1]['value'])
+            s = init_mask[e]['size'] * 2
+            merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+        elif init_mask[e]['type'] == 'ZERO' and init_mask[e + 1]['type'] == 'RPT':
+            t = init_mask[e + 1]['type']
+            v = init_mask[e]['value']
+            v.extend(init_mask[e + 1]['value'])
+            s = init_mask[e]['size'] * 2
+            merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+        elif init_mask[e]['type'] == 'RPT' and init_mask[e + 1]['type'] == 'ONE':
+            t = 'SPC'
+            v = init_mask[e]['value']
+            v.extend(init_mask[e + 1]['value'])
+            s = init_mask[e]['size'] * 2
+            merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+        else:
+            merged_frozen_mask.append(init_mask[e])
+            merged_frozen_mask.append(init_mask[e + 1])
+    return merged_frozen_mask
+
+
+def merge_stage_n(init_mask):
+    merged_frozen_mask = []
+    n_elems = len(init_mask) - (len(init_mask) % 2)
+    for e in range(0, n_elems, 2):
+        if init_mask[e]['size'] == init_mask[e + 1]['size']:
+            if (init_mask[e]['type'] == 'ZERO' or init_mask[e]['type'] == 'ONE') and init_mask[e]['type'] == init_mask[e + 1]['type']:
+                t = init_mask[e]['type']
+                v = init_mask[e]['value']
+                v.extend(init_mask[e + 1]['value'])
+                s = init_mask[e]['size'] * 2
+                merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+            elif init_mask[e]['type'] == 'ZERO' and init_mask[e + 1]['type'] == 'RPT':
+                t = init_mask[e + 1]['type']
+                v = init_mask[e]['value']
+                v.extend(init_mask[e + 1]['value'])
+                s = init_mask[e]['size'] * 2
+                merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+            elif init_mask[e]['type'] == 'SPC' and init_mask[e + 1]['type'] == 'ONE':
+                t = init_mask[e]['type']
+                v = init_mask[e]['value']
+                v.extend(init_mask[e + 1]['value'])
+                s = init_mask[e]['size'] * 2
+                merged_frozen_mask.append({'value': v, 'type': t, 'size': s})
+            else:
+                merged_frozen_mask.append(init_mask[e])
+                merged_frozen_mask.append(init_mask[e + 1])
+        else:
+            merged_frozen_mask.append(init_mask[e])
+            merged_frozen_mask.append(init_mask[e + 1])
+    if n_elems < len(init_mask):
+        merged_frozen_mask.append(init_mask[-1])
+    return merged_frozen_mask
+
+
+def print_decode_subframes(subframes):
+    for e in subframes:
+        print(e)
+
+
+def find_decoder_subframes(frozen_mask):
+    stages = power_of_2_int(len(frozen_mask))
+    block_size = 2 ** stages
+
+    lock_mask = np.zeros(block_size, dtype=int)
+    sub_mask = []
+
+    for e in frozen_mask:
+        if e == 1:
+            sub_mask.append(0)
+        else:
+            sub_mask.append(1)
+    sub_mask = np.array(sub_mask, dtype=int)
+
+    for s in range(0, stages):
+        stage_size = 2 ** s
+        mask = np.reshape(sub_mask, (-1, stage_size))
+        lock = np.reshape(lock_mask, (-1, stage_size))
+        for p in range(0, (block_size // stage_size) - 1, 2):
+            l0 = lock[p]
+            l1 = lock[p + 1]
+            first = mask[p]
+            second = mask[p + 1]
+            print(l0, l1)
+            print(first, second)
+            if np.all(l0 == l1):
+                for eq in range(2):
+                    if np.all(first == eq) and np.all(second == eq):
+                        mask[p].fill(eq)
+                        mask[p + 1].fill(eq)
+                        lock[p].fill(s)
+                        lock[p + 1].fill(s)
+
+                if np.all(first == 0) and np.all(second == 2):
+                    mask[p].fill(2)
+                    mask[p + 1].fill(2)
+                    lock[p].fill(s)
+                    lock[p + 1].fill(s)
+
+                if np.all(first == 3) and np.all(second == 1):
+                    mask[p].fill(3)
+                    mask[p + 1].fill(3)
+                    lock[p].fill(s)
+                    lock[p + 1].fill(s)
+
+            if s == 0 and np.all(first == 0) and np.all(second == 1):
+                mask[p].fill(2)
+                mask[p + 1].fill(2)
+                lock[p].fill(s)
+                lock[p + 1].fill(s)
+
+            if s == 1 and np.all(first == 2) and np.all(second == 1):
+                mask[p].fill(3)
+                mask[p + 1].fill(3)
+                lock[p].fill(s)
+                lock[p + 1].fill(s)
+
+        sub_mask = mask.flatten()
+        lock_mask = lock.flatten()
+
+    words = {0: 'ZERO', 1: 'ONE', 2: 'RPT', 3: 'SPC'}
+    ll = lock_mask[0]
+    sub_t = sub_mask[0]
+    for i in range(len(frozen_mask)):
+        v = frozen_mask[i]
+        t = words[sub_mask[i]]
+        l = lock_mask[i]
+        # if i % 8 == 0:
+        #     print
+        if not l == ll or not sub_mask[i] == sub_t:
+            print('--------------------------')
+        ll = l
+        sub_t = sub_mask[i]
+        print('{0:4} lock {1:4} value: {2} in sub {3}'.format(i, 2 ** (l + 1), v, t))
+
+
+def load_file(filename):
+    z_params = []
+    with open(filename, 'r') as f:
+        for line in f:
+            if 'Bhattacharyya:' in line:
+                l = line.split(' ')
+                l = l[10:-2]
+                l = l[0][:-1]
+                l = float(l)
+                z_params.append(l)
+    return np.array(z_params)
+
+
+def main():
+    n = 8
+    m = 2 ** n
+    k = m // 2
+    n_frozen = n - k
+    # n = 16
+    # k = 8
+    # frozenbits = np.zeros(n - k)
+    # frozenbitposition8 = np.array((0, 1, 2, 4), dtype=int)
+    # frozenbitposition = np.array((0, 1, 2, 3, 4, 5, 8, 9), dtype=int)
+    # print frozenbitposition
+
+    # test_enc_dec_chain()
+    # test_1024_rate_1_code()
+    # channel_analysis()
+
+    frozen_indices = cc.get_bec_frozen_indices(m, n_frozen, 0.11)
+    frozen_mask = cc.get_frozen_bit_mask(frozen_indices, m)
+    find_decoder_subframes(frozen_mask)
+
+    frozen_mask = np.zeros(m, dtype=int)
+    frozen_mask[frozen_indices] = 1
+
+    # filename = 'channel_z-parameters.txt'
+    # ido = load_file(filename)
+    # ido_frozen = cc.get_frozen_bit_indices_from_z_parameters(ido, k)
+    # ido_mask = np.zeros(m, dtype=int)
+    # ido_mask[ido_frozen] = 1
+    #
+    #
+    # plt.plot(ido_mask)
+    # plt.plot(frozen_mask)
+    # for i in range(m):
+    #     if not ido_mask[i] == frozen_mask[i]:
+    #         plt.axvline(i, color='r')
+    # plt.show()
+
+
+if __name__ == '__main__':
+    main()
+\ No newline at end of file
diff --git a/gr-fec/python/fec/qa_polar_decoder_sc.py b/gr-fec/python/fec/qa_polar_decoder_sc.py
new file mode 100644
index 0000000000..1ef458082a
--- /dev/null
+++ b/gr-fec/python/fec/qa_polar_decoder_sc.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest, blocks
+import fec_swig as fec
+
+import numpy as np
+from extended_decoder import extended_decoder
+from polar.encoder import PolarEncoder
+import polar.channel_construction as cc
+
+# import os
+# print('PID:', os.getpid())
+# raw_input('tell me smth')
+
+
+class test_polar_decoder_sc(gr_unittest.TestCase):
+
+    def setUp(self):
+        self.tb = gr.top_block()
+
+    def tearDown(self):
+        self.tb = None
+
+    def test_001_setup(self):
+        block_size = 16
+        num_info_bits = 8
+        frozen_bit_positions = np.arange(block_size - num_info_bits)
+        frozen_bit_values = np.array([],)
+
+        polar_decoder = fec.polar_decoder_sc.make(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+
+        self.assertEqual(num_info_bits, polar_decoder.get_output_size())
+        self.assertEqual(block_size, polar_decoder.get_input_size())
+        self.assertFloatTuplesAlmostEqual((float(num_info_bits) / block_size, ), (polar_decoder.rate(), ))
+        self.assertFalse(polar_decoder.set_frame_size(10))
+
+    def test_002_one_vector(self):
+        block_power = 10
+        block_size = 2 ** block_power
+        num_info_bits = 2 ** (block_power - 1)
+        num_frozen_bits = block_size - num_info_bits
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([0] * num_frozen_bits,)
+
+        bits, gr_data = self.generate_test_data(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values, 1, True)
+
+        polar_decoder = fec.polar_decoder_sc.make(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        src = blocks.vector_source_f(gr_data, False)
+        dec_block = extended_decoder(polar_decoder, None)
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, dec_block)
+        self.tb.connect(dec_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(bits))
+
+    def test_003_stream(self):
+        nframes = 3
+        block_power = 8
+        block_size = 2 ** block_power
+        num_info_bits = 2 ** (block_power - 1)
+        num_frozen_bits = block_size - num_info_bits
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([0] * num_frozen_bits,)
+
+        bits, gr_data = self.generate_test_data(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values, nframes, False)
+
+        polar_decoder = fec.polar_decoder_sc.make(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        src = blocks.vector_source_f(gr_data, False)
+        dec_block = extended_decoder(polar_decoder, None)
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, dec_block)
+        self.tb.connect(dec_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(bits))
+
+    def generate_test_data(self, block_size, num_info_bits, frozen_bit_positions, frozen_bit_values, nframes, onlyones):
+        encoder = PolarEncoder(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        bits = np.array([], dtype=int)
+        data = np.array([], dtype=int)
+        for n in range(nframes):
+            if onlyones:
+                b = np.ones(num_info_bits, dtype=int)
+            else:
+                b = np.random.randint(2, size=num_info_bits)
+            d = encoder.encode(b)
+            bits = np.append(bits, b)
+            data = np.append(data, d)
+        gr_data = 2.0 * data - 1.0
+        return bits, gr_data
+
+
+if __name__ == '__main__':
+    gr_unittest.run(test_polar_decoder_sc)
+
+
diff --git a/gr-fec/python/fec/qa_polar_decoder_sc_list.py b/gr-fec/python/fec/qa_polar_decoder_sc_list.py
new file mode 100644
index 0000000000..adbb736f01
--- /dev/null
+++ b/gr-fec/python/fec/qa_polar_decoder_sc_list.py
@@ -0,0 +1,130 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest, blocks
+import fec_swig as fec
+import numpy as np
+
+from extended_decoder import extended_decoder
+from polar.encoder import PolarEncoder
+import polar.channel_construction as cc
+
+# import os
+# print('PID:', os.getpid())
+# raw_input('tell me smth')
+
+
+class test_polar_decoder_sc_list(gr_unittest.TestCase):
+
+    def setUp(self):
+        self.tb = gr.top_block()
+
+    def tearDown(self):
+        self.tb = None
+
+    def test_001_setup(self):
+        block_size = 16
+        num_info_bits = 8
+        max_list_size = 4
+        frozen_bit_positions = np.arange(block_size - num_info_bits)
+        frozen_bit_values = np.array([],)
+
+        polar_decoder = fec.polar_decoder_sc_list.make(max_list_size, block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+
+        self.assertEqual(num_info_bits, polar_decoder.get_output_size())
+        self.assertEqual(block_size, polar_decoder.get_input_size())
+        self.assertFloatTuplesAlmostEqual((float(num_info_bits) / block_size, ), (polar_decoder.rate(), ))
+        self.assertFalse(polar_decoder.set_frame_size(10))
+
+    def test_002_one_vector(self):
+        print "test_002_one_vector"
+        expo = 6
+        block_size = 2 ** expo
+        num_info_bits = 2 ** (expo - 1)
+        max_list_size = 2 ** (expo - 2)
+        num_frozen_bits = block_size - num_info_bits
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([0] * num_frozen_bits,)
+
+        bits = np.random.randint(2, size=num_info_bits)
+        encoder = PolarEncoder(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        data = encoder.encode(bits)
+        gr_data = 2.0 * data - 1.0
+
+        polar_decoder = fec.polar_decoder_sc_list.make(max_list_size, block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        src = blocks.vector_source_f(gr_data, False)
+        dec_block = extended_decoder(polar_decoder, None)
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, dec_block)
+        self.tb.connect(dec_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+
+        print("\ninput -> result -> bits")
+        print(data)
+        print(res)
+        print(bits)
+
+        self.assertTupleEqual(tuple(res), tuple(bits))
+
+    def test_003_stream(self):
+        print "test_003_stream"
+        nframes = 5
+        expo = 8
+        block_size = 2 ** expo
+        num_info_bits = 2 ** (expo - 1)
+        max_list_size = 2 ** (expo - 2)
+        num_frozen_bits = block_size - num_info_bits
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([0] * num_frozen_bits,)
+
+        encoder = PolarEncoder(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+
+        ref = np.array([], dtype=int)
+        data = np.array([], dtype=int)
+        for i in range(nframes):
+            b = np.random.randint(2, size=num_info_bits)
+            d = encoder.encode(b)
+            data = np.append(data, d)
+            ref = np.append(ref, b)
+        gr_data = 2.0 * data - 1.0
+
+        polar_decoder = fec.polar_decoder_sc_list.make(max_list_size, block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+        src = blocks.vector_source_f(gr_data, False)
+        dec_block = extended_decoder(polar_decoder, None)
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, dec_block)
+        self.tb.connect(dec_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(ref))
+
+
+if __name__ == '__main__':
+    gr_unittest.run(test_polar_decoder_sc_list)
+
+
+
diff --git a/gr-fec/python/fec/qa_polar_encoder.py b/gr-fec/python/fec/qa_polar_encoder.py
new file mode 100644
index 0000000000..22d9b11fae
--- /dev/null
+++ b/gr-fec/python/fec/qa_polar_encoder.py
@@ -0,0 +1,125 @@
+#!/usr/bin/env python
+#
+# Copyright 2015 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest, blocks
+import fec_swig as fec
+import numpy as np
+
+from extended_encoder import extended_encoder
+from polar.encoder import PolarEncoder
+import polar.channel_construction as cc
+
+# import os
+# print('PID:', os.getpid())
+# raw_input('tell me smth')
+
+
+class test_polar_encoder(gr_unittest.TestCase):
+
+    def setUp(self):
+        self.tb = gr.top_block()
+
+    def tearDown(self):
+        self.tb = None
+
+    def test_001_setup(self):
+        block_size = 16
+        num_info_bits = 8
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([],)
+
+        polar_encoder = fec.polar_encoder.make(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+
+        self.assertEqual(block_size, polar_encoder.get_output_size())
+        self.assertEqual(num_info_bits, polar_encoder.get_input_size())
+        self.assertFloatTuplesAlmostEqual((float(num_info_bits) / block_size, ), (polar_encoder.rate(), ))
+        self.assertFalse(polar_encoder.set_frame_size(10))
+
+    def test_002_work_function_packed(self):
+        is_packed = True
+        block_size = 256
+        num_info_bits = block_size // 2
+
+        data, ref, polar_encoder = self.get_test_data(block_size, num_info_bits, 1, is_packed)
+        src = blocks.vector_source_b(data, False)
+        enc_block = extended_encoder(polar_encoder, None, '11')
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, enc_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(ref))
+
+    def test_003_work_function_unpacked(self):
+        is_packed = False
+        block_size = 256
+        num_info_bits = block_size // 2
+
+        data, ref, polar_encoder = self.get_test_data(block_size, num_info_bits, 1, is_packed)
+        src = blocks.vector_source_b(data, False)
+        enc_block = extended_encoder(polar_encoder, None, '11')
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, enc_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(ref))
+
+    def test_004_big_input(self):
+        is_packed = False
+        num_blocks = 30
+        block_size = 1024
+        num_info_bits = block_size // 8
+
+        data, ref, polar_encoder = self.get_test_data(block_size, num_info_bits, num_blocks, is_packed)
+        src = blocks.vector_source_b(data, False)
+        enc_block = extended_encoder(polar_encoder, None, '11')
+        snk = blocks.vector_sink_b(1)
+
+        self.tb.connect(src, enc_block, snk)
+        self.tb.run()
+
+        res = np.array(snk.data()).astype(dtype=int)
+        self.assertTupleEqual(tuple(res), tuple(ref))
+
+    def get_test_data(self, block_size, num_info_bits, num_blocks, is_packed):
+        # helper function to set up test data and together with encoder object.
+        num_frozen_bits = block_size - num_info_bits
+        frozen_bit_positions = cc.frozen_bit_positions(block_size, num_info_bits, 0.0)
+        frozen_bit_values = np.array([0] * num_frozen_bits,)
+        python_encoder = PolarEncoder(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
+
+        data = np.array([], dtype=int)
+        ref = np.array([], dtype=int)
+        for i in range(num_blocks):
+            d = np.random.randint(2, size=num_info_bits)
+            data = np.append(data, d)
+            ref = np.append(ref, python_encoder.encode(d))
+        polar_encoder = fec.polar_encoder.make(block_size, num_info_bits, frozen_bit_positions, frozen_bit_values, is_packed)
+        return data, ref, polar_encoder
+
+
+if __name__ == '__main__':
+    gr_unittest.run(test_polar_encoder)
+
diff --git a/gr-fec/swig/fec_swig.i b/gr-fec/swig/fec_swig.i
index abc78e3ced..a33e8d1efe 100644
--- a/gr-fec/swig/fec_swig.i
+++ b/gr-fec/swig/fec_swig.i
@@ -62,6 +62,11 @@
 #include "gnuradio/fec/ldpc_decoder.h"
 #include "gnuradio/fec/tpc_encoder.h"
 #include "gnuradio/fec/tpc_decoder.h"
+#include "gnuradio/fec/polar_encoder.h"
+#include "gnuradio/fec/polar_decoder_sc.h"
+#include "gnuradio/fec/polar_common.h"
+#include "gnuradio/fec/polar_decoder_sc_list.h"
+#include "gnuradio/fec/polar_decoder_common.h"
 %}
 
 %include "gnuradio/fec/generic_decoder.h"
@@ -104,3 +109,8 @@ GR_SWIG_BLOCK_MAGIC2(fec, conv_bit_corr_bb);
 GR_SWIG_BLOCK_MAGIC2(fec, puncture_bb);
 GR_SWIG_BLOCK_MAGIC2(fec, puncture_ff);
 GR_SWIG_BLOCK_MAGIC2(fec, depuncture_bb);
+%include "gnuradio/fec/polar_encoder.h"
+%include "gnuradio/fec/polar_decoder_sc.h"
+%include "gnuradio/fec/polar_common.h"
+%include "gnuradio/fec/polar_decoder_sc_list.h"
+%include "gnuradio/fec/polar_decoder_common.h"
author	Johnathan Corgan <johnathan@corganlabs.com>	2015-09-23 07:25:23 -0700
committer	Johnathan Corgan <johnathan@corganlabs.com>	2015-09-23 07:25:23 -0700
commit	45faa98d307f84c6000fe32d69f6c12eb8efd180 (patch)
tree	c9d1ec5f869028b5eca99bc6a49da825083d3395 /gr-fec
parent	ffbd9d9c6c9d8c122d90462a96fc0f0f92a3c2b8 (diff)
parent	ad3a02f6c829e9b3ba9ebaef437e1a6087978855 (diff)