+ ENABLE_GNURADIO_RUNTIME

+ ENABLE_GR_BLOCKS

+ ENABLE_GR_FILTER

+# Copyright 2012,2013 Free Software Foundation, Inc.

+ src = blocks.vector_source_b(data, False)

+ self.sink = blocks.vector_sink_f()

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <timestamp>Sun Mar 17 21:08:14 2013</timestamp>

+ <key>qtgui_const_sink_x</key>

+ <value>qtgui_const_sink_x_0</value>

+ <key>type</key>

+ <value>complex</value>

+ <key>name</key>

+ <value>QT GUI Plot</value>

+ <key>size</key>

+ <value>1024</value>

+ <key>ymin</key>

+ <value>-2</value>

+ <key>ymax</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>xmin</key>

+ <value>-2</value>

+ </param>

+ <param>

+ <key>xmax</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>nconnections</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>update_time</key>

+ <value>0.10</value>

+ </param>

+ <param>

+ <key>gui_hint</key>

+ <value>notebook@0</value>

+ <value>(810, 184)</value>

+ <key>qtgui_freq_sink_x</key>

+ <value>qtgui_freq_sink_x_0</value>

+ <key>name</key>

+ <value>QT GUI Plot</value>

+ </param>

+ <param>

+ <key>fftsize</key>

+ <value>1024</value>

+ </param>

+ <param>

+ <key>wintype</key>

+ <value>firdes.WIN_BLACKMAN_hARRIS</value>

+ </param>

+ <param>

+ <key>fc</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>bw</key>

+ <key>ymin</key>

+ <value>-140</value>

+ </param>

+ <param>

+ <key>ymax</key>

+ <value>10</value>

+ </param>

+ <param>

+ <key>nconnections</key>

+ <key>update_time</key>

+ <value>0.10</value>

+ </param>

+ <param>

+ <key>gui_hint</key>

+ <value>notebook@1</value>

+ </param>

+ <param>

+ <value>(810, 65)</value>

+ <key>digital_dxpsk_mod</key>

+ <value>digital_dxpsk_mod_0</value>

+ <value>dqpsk</value>

+ <key>samples_per_symbol</key>

+ <value>samps_per_sym</value>

+ <key>excess_bw</key>

+ <value>0.35</value>

+ <key>mod_code</key>

+ <value>"gray"</value>

+ <key>verbose</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>log</key>

+ <value>False</value>

+ <value>(361, 119)</value>

+ <key>blocks_throttle</key>

+ <value>blocks_throttle_0</value>

+ <key>samples_per_second</key>

+ <value>samp_rate</value>

+ <key>vlen</key>

+ <value>1</value>

+ <key>_coordinate</key>

+ <value>(597, 142)</value>

+ <key>_rotation</key>

+ </block>

+ <block>

+ <key>channels_channel_model</key>

+ <key>id</key>

+ <value>channels_channel_model_0</value>

+ <key>_enabled</key>

+ <value>True</value>

+ <key>noise_voltage</key>

+ <value>noise</value>

+ <key>freq_offset</key>

+ <value>freq_off</value>

+ </param>

+ <param>

+ <key>epsilon</key>

+ <value>1.0</value>

+ </param>

+ <param>

+ <key>taps</key>

+ <value>1.0 + 1.0j</value>

+ </param>

+ <param>

+ <key>seed</key>

+ <value>0</value>

+ <value>(494, 263)</value>

+ <source_block_id>blocks_throttle_0</source_block_id>

+ <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>

+ <source_block_id>blocks_throttle_0</source_block_id>

+ <sink_block_id>qtgui_const_sink_x_0</sink_block_id>

+ <source_block_id>digital_dxpsk_mod_0</source_block_id>

+ <sink_block_id>channels_channel_model_0</sink_block_id>

+ <source_block_id>channels_channel_model_0</source_block_id>

+ <sink_block_id>blocks_throttle_0</sink_block_id>

+ <timestamp>Sun Mar 17 21:08:58 2013</timestamp>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+ <value>wxgui.TRIG_MODE_AUTO</value>

+# Copyright 2011-2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+from gnuradio import channels

+ self.src = blocks.vector_source_c(data.tolist(), False)

+ self.chn = channels.channel_model(noise, foffset, toffset)

+ self.vsnk_src = blocks.vector_sink_c()

+ self.vsnk_cst = blocks.vector_sink_c()

+ self.vsnk_frq = blocks.vector_sink_f()

+# Copyright 2011-2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+from gnuradio import channels

+ self.src = blocks.vector_source_c(data.tolist(), False)

+ self.chn = channels.channel_model(noise, foffset, toffset)

+ self.vsnk_src = blocks.vector_sink_c()

+ self.vsnk_fll = blocks.vector_sink_c()

+ self.vsnk_frq = blocks.vector_sink_f()

+ self.vsnk_phs = blocks.vector_sink_f()

+ self.vsnk_err = blocks.vector_sink_f()

+# Copyright 2011-2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+from gnuradio import channels

+ self.src = blocks.vector_source_c(data.tolist(), False)

+ self.chn = channels.channel_model(noise, foffset, toffset)

+ self.vsnk_err = blocks.vector_sink_f()

+ self.vsnk_rat = blocks.vector_sink_f()

+ self.vsnk_phs = blocks.vector_sink_f()

+ self.vsnk_err = blocks.vector_sink_f()

+ self.vsnk_src = blocks.vector_sink_c()

+ self.vsnk_clk = blocks.vector_sink_c()

+# Copyright 2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ src = blocks.lfsr_32k_source_s()

+ head = blocks.head(gr.sizeof_short, 2048)

+ self.dst = blocks.vector_sink_s()

+ self.src = blocks.file_source(gr.sizeof_gr_complex, ifile)

+ self.snk = blocks.file_sink(gr.sizeof_gr_complex, ofile)

+# Copyright 2010,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self.source = blocks.file_source(gr.sizeof_gr_complex, options.from_file)

+ self.source = blocks.null_source(gr.sizeof_gr_complex)

+# Copyright 2010,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self.sink = blocks.file_sink(gr.sizeof_gr_complex, options.to_file)

+ self.sink = blocks.null_sink(gr.sizeof_gr_complex)

+# Copyright 2008,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self._source = blocks.file_source(gr.sizeof_gr_complex, options.from_file)

+ self._source = blocks.null_source(gr.sizeof_gr_complex)

+# Copyright 2008,2011,2013 Free Software Foundation, Inc.

+ self._bits = blocks.vector_source_b([1,], True) # Infinite stream of ones

+ self._sink = blocks.file_sink(gr.sizeof_gr_complex, options.to_file)

+ self._sink = blocks.null_sink(gr.sizeof_gr_complex)

+# Copyright 2005,2006,2009,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self.source = blocks.file_source(gr.sizeof_gr_complex, options.from_file)

+ self.source = blocks.null_source(gr.sizeof_gr_complex)

+# Copyright 2005-2007,2009,2011,2013 Free Software Foundation, Inc.

+ self.sink = blocks.file_sink(gr.sizeof_gr_complex, options.to_file)

+ self.sink = blocks.null_sink(gr.sizeof_gr_complex)

+ self.src = blocks.file_source(gr.sizeof_gr_complex, ifile)

+ self.snk = blocks.file_sink(gr.sizeof_gr_complex, ofile)

+# Copyright 2006,2007,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self.source = blocks.file_source(gr.sizeof_gr_complex, options.from_file)

+ self.source = blocks.null_source(gr.sizeof_gr_complex)

+# Copyright 2005,2006,2011,2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+ self.sink = blocks.file_sink(gr.sizeof_gr_complex, options.to_file)

+ self.sink = blocks.null_sink(gr.sizeof_gr_complex)

+<?xml version='1.0' encoding='ASCII'?>

+<flow_graph>

+ <timestamp>Thu Feb 14 15:49:35 2013</timestamp>

+ <block>

+ <key>options</key>

+ <param>

+ <key>id</key>

+ <value>rx_ofdm</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>title</key>

+ <value>OFDM Rx</value>

+ </param>

+ <param>

+ <key>author</key>

+ <value></value>

+ </param>

+ <param>

+ <key>description</key>

+ <value>Example of an OFDM receiver</value>

+ </param>

+ <param>

+ <key>window_size</key>

+ <value>1280, 1024</value>

+ </param>

+ <param>

+ <key>generate_options</key>

+ <value>wx_gui</value>

+ </param>

+ <param>

+ <key>category</key>

+ <value>Custom</value>

+ </param>

+ <param>

+ <key>run_options</key>

+ <value>prompt</value>

+ </param>

+ <param>

+ <key>run</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>max_nouts</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>realtime_scheduling</key>

+ <value></value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(0, -1)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_symbols_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((100,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(762, 64)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_carriers</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((0,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(557, 64)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>header_formatter</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.packet_header_ofdm(occupied_carriers, 1, length_tag_name)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(876, 64)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_symbols</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((100,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(659, 64)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>occupied_carriers</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + range(8, 21) + range(22, 27),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(404, 64)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>analog_noise_source_x</key>

+ <param>

+ <key>id</key>

+ <value>analog_noise_source_x_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>noise_type</key>

+ <value>analog.GR_GAUSSIAN</value>

+ </param>

+ <param>

+ <key>amp</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>seed</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(-1, 185)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_sync_sc_cfb</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_sync_sc_cfb_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>cp_len</key>

+ <value>fft_len/4</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(368, 178)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>analog_frequency_modulator_fc</key>

+ <param>

+ <key>id</key>

+ <value>analog_frequency_modulator_fc_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>sensitivity</key>

+ <value>-2.0/fft_len</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(692, 175)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_multiply_xx</key>

+ <param>

+ <key>id</key>

+ <value>blocks_multiply_xx_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>num_inputs</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(885, 223)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_delay</key>

+ <param>

+ <key>id</key>

+ <value>blocks_delay_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>delay</key>

+ <value>fft_len+fft_len/4</value>

+ </param>

+ <param>

+ <key>num_ports</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(368, 253)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>samp_rate</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>3200000</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(0, 91)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>import</key>

+ <param>

+ <key>id</key>

+ <value>import_1</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>import</key>

+ <value>from gnuradio.digital.utils import tagged_streams</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(163, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>sync_word</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>[0, 0, 0, 0, 0, 0, 0, -1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, -1.0, 0, 1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, -1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 0, 0, 0, 0, 0]</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(165, 46)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>header_mod</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.constellation_bpsk()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(655, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>payload_mod</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.constellation_qpsk()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(813, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>n_sync_symbols</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(168, 108)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_throttle</key>

+ <param>

+ <key>id</key>

+ <value>blocks_throttle_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>samples_per_second</key>

+ <value>samp_rate</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(181, 200)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_constellation_decoder_cb</key>

+ <param>

+ <key>id</key>

+ <value>digital_constellation_decoder_cb_0_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>constellation</key>

+ <value>header_mod.base()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(854, 343)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_frame_equalizer_vcvc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_frame_equalizer_vcvc_0_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>equalizer</key>

+ <value>digital.ofdm_equalizer_simpledfe(fft_len, header_mod.base(), occupied_carriers, pilot_carriers, pilot_symbols).base()</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>propagate_channel_state</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(421, 320)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_packet_headerparser_b</key>

+ <param>

+ <key>id</key>

+ <value>digital_packet_headerparser_b_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>header_formatter</key>

+ <value>header_formatter.formatter()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(651, 466)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>fft_vxx</key>

+ <param>

+ <key>id</key>

+ <value>fft_vxx_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>fft_size</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>forward</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>window</key>

+ <value></value>

+ </param>

+ <param>

+ <key>shift</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>nthreads</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(53, 429)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>64</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(301, -1)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>"frame_len"</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(367, -1)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_constellation_decoder_cb</key>

+ <param>

+ <key>id</key>

+ <value>digital_constellation_decoder_cb_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>constellation</key>

+ <value>payload_mod.base()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(718, 635)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_null_sink</key>

+ <param>

+ <key>id</key>

+ <value>blocks_null_sink_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(938, 638)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_frame_equalizer_vcvc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_frame_equalizer_vcvc_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>equalizer</key>

+ <value>digital.ofdm_equalizer_simpledfe(fft_len, header_mod.base(), occupied_carriers, pilot_carriers, pilot_symbols, n_sync_symbols).base()</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_key</value>

+ </param>

+ <param>

+ <key>propagate_channel_state</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(265, 612)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>fft_vxx</key>

+ <param>

+ <key>id</key>

+ <value>fft_vxx_0_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>fft_size</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>forward</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>window</key>

+ <value></value>

+ </param>

+ <param>

+ <key>shift</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>nthreads</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(57, 605)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_serializer_vcc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_serializer_vcc_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>occupied_carriers</key>

+ <value>occupied_carriers</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>packet_len_tag_key</key>

+ <value>""</value>

+ </param>

+ <param>

+ <key>symbols_skipped</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>input_is_shifted</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(649, 305)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_serializer_vcc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_serializer_vcc_1</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>occupied_carriers</key>

+ <value>occupied_carriers</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_key</value>

+ </param>

+ <param>

+ <key>packet_len_tag_key</key>

+ <value>""</value>

+ </param>

+ <param>

+ <key>symbols_skipped</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>input_is_shifted</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(496, 597)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_chanest_vcvc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_chanest_vcvc_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>sync_symbol1</key>

+ <value>sync_word</value>

+ </param>

+ <param>

+ <key>sync_symbol2</key>

+ <value>()</value>

+ </param>

+ <param>

+ <key>n_data_symbols</key>

+ <value>n_sync_symbols</value>

+ </param>

+ <param>

+ <key>eq_noise_red_len</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>max_carr_offset</key>

+ <value>-1</value>

+ </param>

+ <param>

+ <key>force_one_symbol</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(52, 305)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_header_payload_demux</key>

+ <param>

+ <key>id</key>

+ <value>digital_header_payload_demux_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>header_len</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>items_per_symbol</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>guard_interval</key>

+ <value>fft_len/4</value>

+ </param>

+ <param>

+ <key>length_tag_key</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>trigger_tag_key</key>

+ <value>""</value>

+ </param>

+ <param>

+ <key>output_symbols</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(340, 461)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <connection>

+ <source_block_id>fft_vxx_0</source_block_id>

+ <sink_block_id>digital_ofdm_chanest_vcvc_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>analog_frequency_modulator_fc_0</source_block_id>

+ <sink_block_id>blocks_multiply_xx_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_sync_sc_cfb_0</source_block_id>

+ <sink_block_id>analog_frequency_modulator_fc_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>analog_noise_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_throttle_0</source_block_id>

+ <sink_block_id>digital_ofdm_sync_sc_cfb_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_delay_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>blocks_delay_0</source_block_id>

+ <sink_block_id>blocks_multiply_xx_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>1</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_constellation_decoder_cb_0_0</source_block_id>

+ <sink_block_id>digital_packet_headerparser_b_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_serializer_vcc_0</source_block_id>

+ <sink_block_id>digital_constellation_decoder_cb_0_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_sync_sc_cfb_0</source_block_id>

+ <sink_block_id>digital_header_payload_demux_0</sink_block_id>

+ <source_key>1</source_key>

+ <sink_key>1</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_chanest_vcvc_0</source_block_id>

+ <sink_block_id>digital_ofdm_frame_equalizer_vcvc_0_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_frame_equalizer_vcvc_0_0</source_block_id>

+ <sink_block_id>digital_ofdm_serializer_vcc_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_packet_headerparser_b_0</source_block_id>

+ <sink_block_id>digital_header_payload_demux_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>2</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_header_payload_demux_0</source_block_id>

+ <sink_block_id>fft_vxx_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_header_payload_demux_0</source_block_id>

+ <sink_block_id>fft_vxx_0_0</sink_block_id>

+ <source_key>1</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>blocks_multiply_xx_0</source_block_id>

+ <sink_block_id>digital_header_payload_demux_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_constellation_decoder_cb_0</source_block_id>

+ <sink_block_id>blocks_null_sink_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_frame_equalizer_vcvc_0</source_block_id>

+ <sink_block_id>digital_ofdm_serializer_vcc_1</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_serializer_vcc_1</source_block_id>

+ <sink_block_id>digital_constellation_decoder_cb_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>fft_vxx_0_0</source_block_id>

+ <sink_block_id>digital_ofdm_frame_equalizer_vcvc_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+</flow_graph>

+<?xml version='1.0' encoding='ASCII'?>

+<flow_graph>

+ <timestamp>Tue Feb 5 14:47:32 2013</timestamp>

+ <block>

+ <key>options</key>

+ <param>

+ <key>id</key>

+ <value>tx_ofdm</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>title</key>

+ <value>OFDM Tx</value>

+ </param>

+ <param>

+ <key>author</key>

+ <value></value>

+ </param>

+ <param>

+ <key>description</key>

+ <value>Example of an OFDM Transmitter</value>

+ </param>

+ <param>

+ <key>window_size</key>

+ <value>1280, 1024</value>

+ </param>

+ <param>

+ <key>generate_options</key>

+ <value>no_gui</value>

+ </param>

+ <param>

+ <key>category</key>

+ <value>Custom</value>

+ </param>

+ <param>

+ <key>run_options</key>

+ <value>run</value>

+ </param>

+ <param>

+ <key>run</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>max_nouts</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>realtime_scheduling</key>

+ <value></value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(0, -1)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>import</key>

+ <param>

+ <key>id</key>

+ <value>import_1</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>import</key>

+ <value>from gnuradio.digital.utils import tagged_streams</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(164, 45)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>"packet_len"</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(399, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_symbols_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((100,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(735, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>occupied_carriers</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + range(8, 21) + range(22, 27),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(377, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_symbols</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((100,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(632, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>pilot_carriers</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>((0,),)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(530, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>64</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(311, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>header_mod</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.constellation_bpsk()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(620, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>payload_mod</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.constellation_qpsk()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(783, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_throttle</key>

+ <param>

+ <key>id</key>

+ <value>blocks_throttle_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>samples_per_second</key>

+ <value>bit_rate/8</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(234, 167)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>import</key>

+ <param>

+ <key>id</key>

+ <value>import_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>import</key>

+ <value>import numpy</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(164, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>import</key>

+ <param>

+ <key>id</key>

+ <value>import_0_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>import</key>

+ <value>import random</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(-1, 90)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>sync_word</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>[0, 0, 0, 0, 0, 0, 0, -1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, -1.0, 0, 1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, -1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, 1.0, 0, -1.0, 0, 1.0, 0, -1.0, 0, 0, 0, 0, 0, 0]</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(95, 90)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>rolloff</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(234, 91)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>header_formatter</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>digital.packet_header_ofdm(occupied_carriers, 1, length_tag_name)</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(849, 63)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_vector_source_x</key>

+ <param>

+ <key>id</key>

+ <value>blocks_vector_source_x_1</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>vector</key>

+ <value>range(packet_len)</value>

+ </param>

+ <param>

+ <key>tags</key>

+ <value>tagged_streams.make_lengthtags((packet_len,), (0,), length_tag_name)</value>

+ </param>

+ <param>

+ <key>repeat</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(-1, 152)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>packet_len</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>96</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(528, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_packet_headergenerator_bb</key>

+ <param>

+ <key>id</key>

+ <value>digital_packet_headergenerator_bb_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>header_formatter</key>

+ <value>header_formatter.formatter()</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(761, 167)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>variable</key>

+ <param>

+ <key>id</key>

+ <value>bit_rate</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>value</key>

+ <value>3200000</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(311, 0)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_repack_bits_bb</key>

+ <param>

+ <key>id</key>

+ <value>blocks_repack_bits_bb_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>k</key>

+ <value>8</value>

+ </param>

+ <param>

+ <key>l</key>

+ <value>payload_mod.bits_per_symbol()</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>align_output</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(516, 228)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_chunks_to_symbols_xx</key>

+ <param>

+ <key>id</key>

+ <value>digital_chunks_to_symbols_xx_0_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>in_type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>out_type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>symbol_table</key>

+ <value>payload_mod.points()</value>

+ </param>

+ <param>

+ <key>dimension</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>num_ports</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(279, 243)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_chunks_to_symbols_xx</key>

+ <param>

+ <key>id</key>

+ <value>digital_chunks_to_symbols_xx_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>in_type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>out_type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>symbol_table</key>

+ <value>header_mod.points()</value>

+ </param>

+ <param>

+ <key>dimension</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>num_ports</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(319, 305)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_tagged_stream_mux</key>

+ <param>

+ <key>id</key>

+ <value>blocks_tagged_stream_mux_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>ninputs</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>lengthtagname</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(44, 254)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_carrier_allocator_cvc</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_carrier_allocator_cvc_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>occupied_carriers</key>

+ <value>occupied_carriers</value>

+ </param>

+ <param>

+ <key>pilot_carriers</key>

+ <value>pilot_carriers</value>

+ </param>

+ <param>

+ <key>pilot_symbols</key>

+ <value>pilot_symbols</value>

+ </param>

+ <param>

+ <key>len_tag_key</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(56, 453)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_vector_source_x</key>

+ <param>

+ <key>id</key>

+ <value>sync_word_source</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>vector</key>

+ <value>numpy.array(sync_word) * numpy.sqrt(2)</value>

+ </param>

+ <param>

+ <key>tags</key>

+ <value>tagged_streams.make_lengthtags((len(sync_word)/fft_len,), (0,), length_tag_name)</value>

+ </param>

+ <param>

+ <key>repeat</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(56, 356)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_tagged_stream_mux</key>

+ <param>

+ <key>id</key>

+ <value>blocks_tagged_stream_mux_1</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>ninputs</key>

+ <value>2</value>

+ </param>

+ <param>

+ <key>lengthtagname</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(374, 382)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>fft_vxx</key>

+ <param>

+ <key>id</key>

+ <value>fft_vxx_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>fft_size</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>forward</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>window</key>

+ <value></value>

+ </param>

+ <param>

+ <key>shift</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>nthreads</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(765, 498)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_ofdm_cyclic_prefixer</key>

+ <param>

+ <key>id</key>

+ <value>digital_ofdm_cyclic_prefixer_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>input_size</key>

+ <value>fft_len</value>

+ </param>

+ <param>

+ <key>output_size</key>

+ <value>fft_len+fft_len/4</value>

+ </param>

+ <param>

+ <key>rolloff</key>

+ <value>rolloff</value>

+ </param>

+ <param>

+ <key>tagname</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(488, 505)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>wxgui_fftsink2</key>

+ <param>

+ <key>id</key>

+ <value>wxgui_fftsink2_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>title</key>

+ <value>FFT Plot</value>

+ </param>

+ <param>

+ <key>samp_rate</key>

+ <value>1.0</value>

+ </param>

+ <param>

+ <key>baseband_freq</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>y_per_div</key>

+ <value>10</value>

+ </param>

+ <param>

+ <key>y_divs</key>

+ <value>10</value>

+ </param>

+ <param>

+ <key>ref_level</key>

+ <value>50</value>

+ </param>

+ <param>

+ <key>ref_scale</key>

+ <value>2.0</value>

+ </param>

+ <param>

+ <key>fft_size</key>

+ <value>1024</value>

+ </param>

+ <param>

+ <key>fft_rate</key>

+ <value>15</value>

+ </param>

+ <param>

+ <key>peak_hold</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>average</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>avg_alpha</key>

+ <value>0</value>

+ </param>

+ <param>

+ <key>win</key>

+ <value>None</value>

+ </param>

+ <param>

+ <key>win_size</key>

+ <value></value>

+ </param>

+ <param>

+ <key>grid_pos</key>

+ <value></value>

+ </param>

+ <param>

+ <key>notebook</key>

+ <value></value>

+ </param>

+ <param>

+ <key>freqvar</key>

+ <value>None</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(291, 460)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_null_sink</key>

+ <param>

+ <key>id</key>

+ <value>blocks_null_sink_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>complex</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(438, 633)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>180</value>

+ </param>

+ </block>

+ <block>

+ <key>digital_crc32_bb</key>

+ <param>

+ <key>id</key>

+ <value>digital_crc32_bb_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>check</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>lengthtagname</key>

+ <value>length_tag_name</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(472, 159)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <block>

+ <key>blocks_tag_debug</key>

+ <param>

+ <key>id</key>

+ <value>blocks_tag_debug_0</value>

+ </param>

+ <param>

+ <key>_enabled</key>

+ <value>True</value>

+ </param>

+ <param>

+ <key>type</key>

+ <value>byte</value>

+ </param>

+ <param>

+ <key>name</key>

+ <value>tdb</value>

+ </param>

+ <param>

+ <key>num_inputs</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>vlen</key>

+ <value>1</value>

+ </param>

+ <param>

+ <key>display</key>

+ <value>False</value>

+ </param>

+ <param>

+ <key>_coordinate</key>

+ <value>(819, 232)</value>

+ </param>

+ <param>

+ <key>_rotation</key>

+ <value>0</value>

+ </param>

+ </block>

+ <connection>

+ <source_block_id>blocks_vector_source_x_1</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_throttle_0</source_block_id>

+ <sink_block_id>digital_crc32_bb_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_crc32_bb_0</source_block_id>

+ <sink_block_id>digital_packet_headergenerator_bb_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>blocks_tagged_stream_mux_0</source_block_id>

+ <sink_block_id>digital_ofdm_carrier_allocator_cvc_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_carrier_allocator_cvc_0</source_block_id>

+ <sink_block_id>blocks_tagged_stream_mux_1</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>1</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>sync_word_source</source_block_id>

+ <sink_block_id>blocks_tagged_stream_mux_1</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_packet_headergenerator_bb_0</source_block_id>

+ <sink_block_id>digital_chunks_to_symbols_xx_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_chunks_to_symbols_xx_0_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_chunks_to_symbols_xx_0</source_block_id>

+ <sink_block_id>blocks_tagged_stream_mux_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_chunks_to_symbols_xx_0_0</source_block_id>

+ <sink_block_id>blocks_tagged_stream_mux_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>1</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_crc32_bb_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_tagged_stream_mux_1</source_block_id>

+ <sink_block_id>fft_vxx_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_cyclic_prefixer_0</source_block_id>

+ <sink_block_id>wxgui_fftsink2_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>fft_vxx_0</source_block_id>

+ <sink_block_id>digital_ofdm_cyclic_prefixer_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_ofdm_cyclic_prefixer_0</source_block_id>

+ <sink_block_id>blocks_null_sink_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+ <connection>

+ <source_block_id>digital_crc32_bb_0</source_block_id>

+ <sink_block_id>blocks_tag_debug_0</sink_block_id>

+ <source_key>0</source_key>

+ <sink_key>0</sink_key>

+ </connection>

+</flow_graph>

+# Copyright 2011-2013 Free Software Foundation, Inc.

+from gnuradio import blocks

+from gnuradio import channels

+ gr_src = blocks.vector_source_c(bits.tolist(), False)

+ gr_chn = channels.channel_model(1.0/scale)

+ gr_snk = blocks.null_sink(gr.sizeof_gr_complex)

+Requires: gnuradio-runtime

+install(FILES ${xml_files}

+ DESTINATION ${GRC_BLOCKS_DIR} COMPONENT "digital_python"

+)

+ Copyright 2011,2012 Free Software Foundation, Inc.

+ <block>digital_descrambler_bb</block>

+ <block>digital_binary_slicer_fb</block>

+ <block>digital_bytes_to_syms</block>

+ <block>digital_chunks_to_symbols_xx</block>

+ <block>digital_clock_recovery_mm_xx</block>

+ <block>digital_cma_equalizer_cc</block>

+ <block>digital_constellation_decoder_cb</block>

+ <block>digital_constellation_receiver_cb</block>

+ <block>digital_correlate_access_code_bb</block>

+ <block>digital_costas_loop_cc</block>

+ <block>digital_crc32_bb</block>

+ <block>digital_descrambler_bb</block>

+ <block>digital_fll_band_edge_cc</block>

+ <block>digital_glfsr_source_x</block>

+ <block>digital_header_payload_demux</block>

+ <block>digital_kurtotic_equalizer_cc</block>

+ <block>digital_lms_dd_equalizer_cc</block>

+ <block>digital_map_bb</block>

+ <block>digital_mpsk_receiver_cc</block>

+ <block>digital_mpsk_snr_est_cc</block>

+ <block>digital_packet_headergenerator_bb</block>

+ <block>digital_packet_headergenerator_bb_default</block>

+ <block>digital_packet_headerparser_b</block>

+ <block>digital_packet_headerparser_b_default</block>

+ <block>digital_pfb_clock_sync_xxx</block>

+ <block>digital_pn_correlator_cc</block>

+ <block>digital_probe_density_b</block>

+ <block>digital_probe_mpsk_snr_est_c</block>

+ <name>OFDM</name>

+ <block>digital_ofdm_mod2</block>

+ <block>digital_ofdm_carrier_allocator_cvc</block>

+ <block>digital_ofdm_chanest_vcvc</block>

+ <block>digital_ofdm_frame_equalizer_vcvc</block>

+ <block>digital_ofdm_serializer_vcc</block>

+ <block>digital_ofdm_sync_sc_cfb</block>

+<block>

+ <name>Stream CRC32</name>

+ <key>digital_crc32_bb</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.crc32_bb($check, $lengthtagname)</make>

+ <param>

+ <name>Mode</name>

+ <key>check</key>

+ <type>enum</type>

+ <option>

+ <name>Generate CRC</name>

+ <key>False</key>

+ </option>

+ <option>

+ <name>Check CRC</name>

+ <key>True</key>

+ </option>

+ </param>

+ <param>

+ <name>Length tag name</name>

+ <key>lengthtagname</key>

+ <value>"packet_len"</value>

+ <type>string</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>byte</type>

+ </source>

+</block>

+<block>

+ <name>Header payload demux</name>

+ <key>digital_header_payload_demux</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.header_payload_demux($header_len, $items_per_symbol, $guard_interval, $length_tag_key, $trigger_tag_key, $output_symbols, $(type.itemsize))</make>

+ <param>

+ <name>Header Length (Symbols)</name>

+ <key>header_len</key>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Items per symbol</name>

+ <key>items_per_symbol</key>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Guard Interval (items)</name>

+ <key>guard_interval</key>

+ <value>0</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Length tag key</name>

+ <key>length_tag_key</key>

+ <value>"frame_len"</value>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Trigger tag key</name>

+ <key>trigger_tag_key</key>

+ <value>""</value>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Output Format</name>

+ <key>output_symbols</key>

+ <type>enum</type>

+ <option>

+ <name>Items</name>

+ <key>False</key>

+ </option>

+ <option>

+ <name>Symbols</name>

+ <key>True</key>

+ </option>

+ </param>

+ <param>

+ <name>IO Type</name>

+ <key>type</key>

+ <type>enum</type>

+ <option>

+ <name>Complex</name>

+ <key>complex</key>

+ <opt>itemsize:gr.sizeof_gr_complex</opt>

+ </option>

+ <option>

+ <name>Float</name>

+ <key>float</key>

+ <opt>itemsize:gr.sizeof_float</opt>

+ </option>

+ <option>

+ <name>Int</name>

+ <key>int</key>

+ <opt>itemsize:gr.sizeof_int</opt>

+ </option>

+ <option>

+ <name>Short</name>

+ <key>short</key>

+ <opt>itemsize:gr.sizeof_short</opt>

+ </option>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>$type</type>

+ </sink>

+ <sink>

+ <name>trigger</name>

+ <type>byte</type>

+ </sink>

+ <sink>

+ <name>header_data</name>

+ <type>message</type>

+ </sink>

+ <source>

+ <name>out_hdr</name>

+ <type>$type</type>

+ <vlen>{True: $items_per_symbol, False: 1}[$output_symbols]</vlen>

+ </source>

+ <source>

+ <name>out_payload</name>

+ <type>$type</type>

+ <vlen>{True: $items_per_symbol, False: 1}[$output_symbols]</vlen>

+ </source>

+</block>

+<?xml version="1.0"?>

+<block>

+ <name>OFDM Carrier Allocator</name>

+ <key>digital_ofdm_carrier_allocator_cvc</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_carrier_allocator_cvc($fft_len, $occupied_carriers, $pilot_carriers, $pilot_symbols, $sync_words, $len_tag_key)</make>

+ <param>

+ <name>FFT length</name>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Occupied Carriers</name>

+ <key>occupied_carriers</key>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Pilot Carriers</name>

+ <key>pilot_carriers</key>

+ <value>()</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Pilot Symbols</name>

+ <key>pilot_symbols</key>

+ <value>()</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Sync Words</name>

+ <key>sync_words</key>

+ <value>()</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Length tag key</name>

+ <key>len_tag_key</key>

+ <value>"packet_len"</value>

+ <type>string</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>complex</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>complex</type>

+ <vlen>$fft_len</vlen>

+ </source>

+</block>

+<?xml version="1.0"?>

+<block>

+ <name>OFDM channel &amp; coarse frequency offset estimation</name>

+ <key>digital_ofdm_chanest_vcvc</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_chanest_vcvc($sync_symbol1, $sync_symbol2, $n_data_symbols, $eq_noise_red_len, $max_carr_offset, $force_one_symbol)</make>

+ <param>

+ <name>Synchronisation preamble symbol 1</name>

+ <key>sync_symbol1</key>

+ <type>complex_vector</type>

+ </param>

+ <param>

+ <name>Synchronisation preamble symbol 2</name>

+ <key>sync_symbol2</key>

+ <value>()</value>

+ <type>complex_vector</type>

+ </param>

+ <param>

+ <name>Number of data symbols</name>

+ <key>n_data_symbols</key>

+ <value>1</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Channel taps noise reduction length</name>

+ <key>eq_noise_red_len</key>

+ <value>0</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Maximum carrier offset</name>

+ <key>max_carr_offset</key>

+ <value>-1</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Force One Synchronisation Symbol</name>

+ <key>force_one_symbol</key>

+ <type>enum</type>

+ <option>

+ <name>No</name>

+ <key>False</key>

+ </option>

+ <option>

+ <name>Yes</name>

+ <key>True</key>

+ </option>

+ </param>

+ <check>len($sync_symbol1)</check>

+ <check>len($sync_symbol2) == 0 or len($sync_symbol2) == len($sync_symbol1)</check>

+ <sink>

+ <name>in</name>

+ <type>complex</type>

+ <vlen>len($sync_symbol1)</vlen>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>complex</type>

+ <vlen>len($sync_symbol1)</vlen>

+ </source>

+</block>

+ <make>digital.ofdm_cyclic_prefixer($input_size, $output_size, $rolloff, $tagname)</make>

+ <name>FFT Length</name>

+ <value>fft_len</value>

+ <name>Output Size (FFT length + CP length)</name>

+ <value>fft_len+fft_len/4</value>

+ <param>

+ <name>Rolloff</name>

+ <key>rolloff</key>

+ <value>0</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Length Tag Key</name>

+ <key>tagname</key>

+ <value>"frame_len"</value>

+ <type>string</type>

+ </param>

+<block>

+ <name>OFDM Frame Equalizer</name>

+ <key>digital_ofdm_frame_equalizer_vcvc</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_frame_equalizer_vcvc($equalizer, $len_tag_key, $propagate_channel_state)</make>

+ <param>

+ <name>FFT length</name>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Equalizer</name>

+ <key>equalizer</key>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Length Tag Key</name>

+ <key>len_tag_key</key>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Propagate Channel State</name>

+ <key>propagate_channel_state</key>

+ <type>enum</type>

+ <option>

+ <name>Yes</name>

+ <key>True</key>

+ </option>

+ <option>

+ <name>No</name>

+ <key>False</key>

+ </option>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>complex</type>

+ <vlen>$fft_len</vlen>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>complex</type>

+ <vlen>$fft_len</vlen>

+ </source>

+</block>

+<block>

+ <name>OFDM Mod 2</name>

+ <key>digital_ofdm_mod2</key>

+ <category>OFDM</category>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_mod2(fft_len=$fft_len,

+ cp_len=$cp_len,

+ length_tag_name=$length_tag_name,

+ occupied_carriers=$occupied_carriers,

+ pilot_carriers=$pilot_carriers,

+ pilot_symbols=$pilot_symbols,

+ sync_sequence=$sync_sequence,

+ )

+ </make>

+ <param>

+ <name>Cyclic Prefix Length</name>

+ <key>cp_len</key>

+ <value>16</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>FFT Length</name>

+ <key>fft_len</key>

+ <value>64</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Length Tag Name</name>

+ <key>length_tag_name</key>

+ <value>length</value>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Occupied Carriers</name>

+ <key>occupied_carriers</key>

+ <value>(range(1, 27) + range(38, 64),)</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Pilot Carriers</name>

+ <key>pilot_carriers</key>

+ <value>((0,),)</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Pilot Symbols</name>

+ <key>pilot_symbols</key>

+ <value>((100,),)</value>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Synchronization Sequence</name>

+ <key>sync_sequence</key>

+ <value>None</value>

+ <type>raw</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>complex</type>

+ </source>

+</block>

+<?xml version="1.0"?>

+<block>

+ <name>OFDM Serializer</name>

+ <key>digital_ofdm_serializer_vcc</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_serializer_vcc($fft_len, $occupied_carriers, $len_tag_key, $packet_len_tag_key, $symbols_skipped, $input_is_shifted)</make>

+ <param>

+ <name>FFT length</name>

+ <key>fft_len</key>

+ <value>fft_len</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Occupied Carriers</name>

+ <key>occupied_carriers</key>

+ <type>raw</type>

+ </param>

+ <param>

+ <name>Length Tag Key</name>

+ <key>len_tag_key</key>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Packet Length Tag Key</name>

+ <key>packet_len_tag_key</key>

+ <value>""</value>

+ <type>string</type>

+ </param>

+ <param>

+ <name>Symbols skipped</name>

+ <key>symbols_skipped</key>

+ <value>0</value>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Input is shifted</name>

+ <key>input_is_shifted</key>

+ <value>True</value>

+ <type>bool</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>complex</type>

+ <vlen>$fft_len</vlen>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>complex</type>

+ </source>

+</block>

+<?xml version="1.0"?>

+<block>

+ <name>Schmidl &amp; Cox OFDM synchronisation</name>

+ <key>digital_ofdm_sync_sc_cfb</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.ofdm_sync_sc_cfb($fft_len, $cp_len)</make>

+ <param>

+ <name>FFT length</name>

+ <key>fft_len</key>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Cyclic Prefix length</name>

+ <key>cp_len</key>

+ <type>int</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>complex</type>

+ </sink>

+ <source>

+ <name>freq_offset</name>

+ <type>float</type>

+ </source>

+ <source>

+ <name>detect</name>

+ <type>byte</type>

+ </source>

+</block>

+<block>

+ <name>Packet Header Generator</name>

+ <key>digital_packet_headergenerator_bb</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.packet_headergenerator_bb($header_formatter)</make>

+ <param>

+ <name>Formatter Object</name>

+ <key>header_formatter</key>

+ <type>raw</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>byte</type>

+ </source>

+</block>

+<block>

+ <name>Packet Header Generator</name>

+ <key>digital_packet_headergenerator_bb_default</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.packet_headergenerator_bb($header_len, $len_tag_key)</make>

+ <param>

+ <name>Header Length</name>

+ <key>header_len</key>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Length Tag Name</name>

+ <key>len_tag_key</key>

+ <value>"packet_len"</value>

+ <type>string</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>byte</type>

+ </source>

+</block>

+

+<block>

+ <name>Packet Header Parser</name>

+ <key>digital_packet_headerparser_b</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.packet_headerparser_b($header_formatter)</make>

+ <param>

+ <name>Formatter Object</name>

+ <key>header_formatter</key>

+ <type>raw</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>header_data</name>

+ <type>message</type>

+ </source>

+</block>

+<block>

+ <name>Packet Header Parser (Default)</name>

+ <key>digital_packet_headerparser_b_default</key>

+ <import>from gnuradio import digital</import>

+ <make>digital.packet_headerparser_b($header_len, $len_tag_key)</make>

+ <param>

+ <name>Header Length</name>

+ <key>header_len</key>

+ <type>int</type>

+ </param>

+ <param>

+ <name>Length Tag Name</name>

+ <key>len_tag_key</key>

+ <value>"packet_len"</value>

+ <type>string</type>

+ </param>

+ <sink>

+ <name>in</name>

+ <type>byte</type>

+ </sink>

+ <source>

+ <name>out</name>

+ <type>message</type>

+ </source>

+</block>

+

+sys.path.append('${GR_RUNTIME_PYTHONPATH}')

+ api.h

+ constellation.h

+ constellation_receiver_cb.h

+ cpmmod_bc.h

+ crc32.h

+ crc32_bb.h

+ framer_sink_1.h

+ glfsr.h

+ header_payload_demux.h

+ lfsr.h

+ mpsk_snr_est.h

+ ofdm_carrier_allocator_cvc.h

+ ofdm_chanest_vcvc.h

+ ofdm_equalizer_base.h

+ ofdm_equalizer_simpledfe.h

+ ofdm_equalizer_static.h

+ ofdm_frame_equalizer_vcvc.h

+ ofdm_serializer_vcc.h

+ ofdm_sync_sc_cfb.h

+ packet_header_default.h

+ packet_header_ofdm.h

+ packet_headergenerator_bb.h

+ packet_headerparser_b.h

+ simple_framer.h

+ simple_framer_sync.h

+ header_payload_demux.h

+#include <attributes.h>

+ virtual void calc_metric(const gr_complex *sample, float *metric, gr::digital::trellis_metric_type_t type);

+#include <blocks/control_loop.h>

+ class DIGITAL_API costas_loop_cc

+ : virtual public gr_sync_block,

+ virtual public blocks::control_loop

+/* -*- c++ -*- */

+/*

+ * Copyright 2013 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_DIGITAL_CRC32_BB_H

+#define INCLUDED_DIGITAL_CRC32_BB_H

+

+#include <digital/api.h>

+#include <gr_tagged_stream_block.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Byte-stream CRC block

+ * \ingroup digital

+ *

+ * Input: stream of bytes, which form a packet. The first byte of the packet

+ * has a tag with key "length" and the value being the number of bytes in the

+ * packet.

+ *

+ * Output: The same bytes as incoming, but trailing a CRC32 of the packet.

+ * The tag is re-set to the new length.

+ */

+ class DIGITAL_API crc32_bb : virtual public gr_tagged_stream_block

+ {

+ public:

+ typedef boost::shared_ptr<crc32_bb> sptr;

+

+ /*!

+ * \param check Set to true if you want to check CRC, false to create CRC.

+ * \param lengthtagname Length tag key

+ */

+ static sptr make(bool check=false, const std::string& lengthtagname="packet_len");

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_CRC32_BB_H */

+

+#include <blocks/control_loop.h>

+ virtual public blocks::control_loop

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_HEADER_PAYLOAD_DEMUX_H

+#define INCLUDED_DIGITAL_HEADER_PAYLOAD_DEMUX_H

+

+#include <digital/api.h>

+#include <gr_block.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Header/Payload demuxer.

+ * \ingroup digital

+ *

+ * This block is designed to handle packets from a bursty transmission.

+ * Input 0 takes a continuous transmission of samples.

+ * If used, input 1 is a trigger signal. In this case, a 1 on input 1

+ * is a trigger. Otherwise, a tag with the key specified in \p trigger_tag_key

+ * is used as a trigger (its value is irrelevant).

+ *

+ * Until a trigger signal is detected, all samples are dropped onto the floor.

+ * Once a trigger is detected, a total of \p header_len items are copied to output 0.

+ * The block then stalls until it receives a message on the message port

+ * \p header_data. The message must be a PMT dictionary; all key/value pairs are

+ * copied as tags to the first item of the payload (which is assumed to be the

+ * first item after the header).

+ * The value corresponding to the key specified in \p length_tag_key is read

+ * and taken as the payload length. The payload, together with the header data

+ * as tags, is then copied to output 1.

+ *

+ * If specified, \p guard_interval items are discarded before every symbol.

+ * This is useful for demuxing bursts of OFDM signals.

+ *

+ * Any tags on the input stream are copied to the corresponding output *if* they're

+ * on an item that is propagated. Note that a tag on the header items is copied to the

+ * header stream; that means the header-parsing block must handle these tags if they

+ * should go on the payload.

+ * A special case are tags on items that make up the guard interval. These are copied

+ * to the first item of the following symbol.

+ */

+ class DIGITAL_API header_payload_demux : virtual public gr_block

+ {

+ public:

+ typedef boost::shared_ptr<header_payload_demux> sptr;

+

+ /*!

+ * \param header_len Number of symbols per header

+ * \param items_per_symbol Number of items per symbol

+ * \param guard_interval Number of items between two consecutive symbols

+ * \param length_tag_key Key of the frame length tag

+ * \param trigger_tag_key Key of the trigger tag

+ * \param output_symbols Output symbols (true) or items (false)?

+ * \param itemsize Item size (bytes per item)

+ */

+ static sptr make(

+ int header_len,

+ int items_per_symbol,

+ int guard_interval=0,

+ const std::string &length_tag_key="frame_len",

+ const std::string &trigger_tag_key="",

+ bool output_symbols=false,

+ size_t itemsize=sizeof(gr_complex)

+ );

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_HEADER_PAYLOAD_DEMUX_H */

+

+/* -*- c++ -*- */

+/*

+ * Copyright 2013 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_DIGITAL_OFDM_CARRIER_ALLOCATOR_CVC_H

+#define INCLUDED_DIGITAL_OFDM_CARRIER_ALLOCATOR_CVC_H

+

+#include <digital/api.h>

+#include <gr_tagged_stream_block.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Create frequency domain OFDM symbols from complex values, add pilots.

+ * \ingroup ofdm_blk

+ *

+ * This block turns a stream of complex, scalar modulation symbols into vectors

+ * which are the input for an IFFT in an OFDM transmitter. It also supports the

+ * possibility of placing pilot symbols onto the carriers.

+ *

+ * The carriers can be allocated freely, if a carrier is not allocated, it is set

+ * to zero. This allows doing OFDMA-style carrier allocations.

+ *

+ * Input: A tagged stream of complex scalars. The first item must have a tag

+ * containing the number of complex symbols in this frame.

+ * Output: A tagged stream of complex vectors of length fft_len. This can directly

+ * be connected to an FFT block. Make sure to set this block to 'reverse'

+ * for the IFFT. If \p output_is_shifted is true, the FFT block must activate

+ * FFT shifting, otherwise, set shifting to false. If given, sync words are

+ * prepended to the output. Note that sync words are prepended verbatim,

+ * make sure they are shifted (or not).

+ *

+ * Carrier indexes are always such that index 0 is the DC carrier (note: you should

+ * not allocate this carrier). The carriers below the DC carrier are either indexed

+ * with negative numbers, or with indexes larger than \p fft_len/2. Index -1 and index

+ * \p fft_len-1 both identify the carrier below the DC carrier.

+ *

+ */

+ class DIGITAL_API ofdm_carrier_allocator_cvc : virtual public gr_tagged_stream_block

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_carrier_allocator_cvc> sptr;

+

+ virtual std::string len_tag_key() = 0;

+ virtual const int fft_len() = 0;

+ virtual std::vector<std::vector<int> > occupied_carriers() = 0;

+

+ /*

+ * \param fft_len FFT length, is also the maximum width of the OFDM symbols, the

+ * output vector size and maximum value for elements in

+ * \p occupied_carriers and \p pilot_carriers.

+ * \param occupied_carriers A vector of vectors of indexes. Example: if

+ * occupied_carriers = ((1, 2, 3), (1, 2, 4)), the first

+ * three input symbols will be mapped to carriers 1, 2

+ * and 3. After that, a new OFDM symbol is started. The next

+ * three input symbols will be placed onto carriers 1, 2

+ * and 4 of the second OFDM symbol. The allocation then

+ * starts from the beginning.

+ * Order matters! The first input symbol is always mapped

+ * onto occupied_carriers[0][0].

+ * \param pilot_carriers The position of the pilot symbols. Same as occupied_carriers,

+ * but the actual symbols are taken from pilot_symbols instead

+ * of the input stream.

+ * \param pilot_symbols The pilot symbols which are placed onto the pilot carriers.

+ * pilot_symbols[0][0] is placed onto the first OFDM symbol, on

+ * carrier index pilot_carriers[0][0] etc.

+ * \param sync_words OFDM symbols that are prepended to the OFDM frame (usually for

+ * synchronisation purposes, e.g. OFDM symbols with every second

+ * sub-carrier being idle). Is a vector of complex vectors of length

+ * \p fft_len

+ * \param len_tag_key The key of the tag identifying the length of the input packet.

+ */

+ static sptr make(

+ int fft_len,

+ const std::vector<std::vector<int> > &occupied_carriers,

+ const std::vector<std::vector<int> > &pilot_carriers,

+ const std::vector<std::vector<gr_complex> > &pilot_symbols,

+ const std::vector<std::vector<gr_complex> > &sync_words,

+ const std::string &len_tag_key = "packet_len",

+ const bool output_is_shifted=true);

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_OFDM_CARRIER_ALLOCATOR_CVC_H */

+

+/* -*- c++ -*- */

+/*

+ * Copyright 2013 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_DIGITAL_OFDM_CHANEST_VCVC_H

+#define INCLUDED_DIGITAL_OFDM_CHANEST_VCVC_H

+

+#include <digital/api.h>

+#include <gr_block.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Estimate channel and coarse frequency offset for OFDM from preambles

+ * \ingroup ofdm_blk

+ * \ingroup sync_blk

+ *

+ * Input: OFDM symbols (in frequency domain). The first one (or two) symbols are expected

+ * to be synchronisation symbols, which are used to estimate the coarse freq offset

+ * and the initial equalizer taps (these symbols are removed from the stream).

+ * The following \p n_data_symbols are passed through unmodified (the actual equalisation

+ * must be done elsewhere).

+ * Output: The data symbols, without the synchronisation symbols.

+ * The first data symbol passed through has two tags:

+ * 'ofdm_sync_carr_offset' (integer), the coarse frequency offset as number of carriers,

+ * and 'ofdm_sync_eq_taps' (complex vector).

+ * Any tags attached to the synchronisation symbols are attached to the first data

+ * symbol. All other tags are propagated normally.

+ *

+ * This block assumes the frequency offset is even (i.e. an integer multiple of 2).

+ *

+ * [1] Schmidl, T.M. and Cox, D.C., "Robust frequency and timing synchronization for OFDM",

+ * Communications, IEEE Transactions on, 1997.

+ * [2] K.D. Kammeyer, "Nachrichtenuebertragung," Chapter. 16.3.2.

+ */

+ class DIGITAL_API ofdm_chanest_vcvc : virtual public gr_block

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_chanest_vcvc> sptr;

+

+ /*

+ * \param sync_symbol1 First synchronisation symbol in the frequency domain. Its length must be

+ * the FFT length. For Schmidl & Cox synchronisation, every second sub-carrier

+ * has to be zero.

+ * \param sync_symbol2 Second synchronisation symbol in the frequency domain. Must be equal to

+ * the FFT length, or zero length if only one synchronisation symbol is used.

+ * Using this symbol is how synchronisation is described in [1]. Leaving this

+ * empty forces us to interpolate the equalizer taps.

+ * If you are using an unusual sub-carrier configuration (e.g. because of OFDMA),

+ * this sync symbol is used to identify the active sub-carriers. If you only

+ * have one synchronisation symbol, set the active sub-carriers to a non-zero

+ * value in here, and also set \p force_one_sync_symbol parameter to true.

+ * \param n_data_symbols The number of data symbols following each set of synchronisation symbols.

+ * Must be at least 1.

+ * \param eq_noise_red_len If non-zero, noise reduction for the equalizer taps is done according

+ * to [2]. In this case, it is the channel influence time in number of

+ * samples. A good value is usually the length of the cyclic prefix.

+ * \param max_carr_offset Limit the number of sub-carriers the frequency offset can maximally be.

+ * Leave this zero to try all possibilities.

+ * \param force_one_sync_symbol See \p sync_symbol2.

+ */

+ static sptr make(

+ const std::vector<gr_complex> &sync_symbol1,

+ const std::vector<gr_complex> &sync_symbol2,

+ int n_data_symbols,

+ int eq_noise_red_len=0,

+ int max_carr_offset=-1,

+ bool force_one_sync_symbol=false

+ );

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_OFDM_CHANEST_VCVC_H */

+

+/*

+ * Copyright 2013 Free Software Foundation, Inc.

+#include <gr_tagged_stream_block.h>

+

+ * \brief Adds a cyclic prefix and performs pulse shaping on OFDM symbols.

+ *

+ * Input: OFDM symbols (in the time domain, i.e. after the IFFT). Optionally,

+ * entire frames can be processed. In this case, \p len_tag_key must be

+ * specified which holds the key of the tag that denotes how

+ * many OFDM symbols are in a frame.

+ * Output: A stream of (scalar) complex symbols, which include the cyclic prefix

+ * and the pulse shaping.

+ * Note: If complete frames are processed, and \p rolloff_len is greater

+ * than zero, the final OFDM symbol is followed by the delay line of

+ * the pulse shaping.

+ *

+ * The pulse shape is a raised cosine in the time domain.

+ class DIGITAL_API ofdm_cyclic_prefixer : virtual public gr_tagged_stream_block

+ public:

+ * \param input_size FFT length (i.e. length of the OFDM symbols)

+ * \param output_size FFT length + cyclic prefix length (in samples)

+ * \param rolloff_len Length of the rolloff flank in samples

+ * \param len_tag_key For framed processing the key of the length tag

+ static sptr make(

+ size_t input_size,

+ size_t output_size,

+ int rolloff_len=0,

+ const std::string &len_tag_key=""

+ );

+ } // namespace digital

+} // namespace gr

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_OFDM_EQUALIZER_BASE_H

+#define INCLUDED_DIGITAL_OFDM_EQUALIZER_BASE_H

+

+#include <digital/api.h>

+#include <gr_tags.h>

+#include <gr_complex.h>

+#include <boost/enable_shared_from_this.hpp>

+

+namespace gr {

+ namespace digital {

+

+ /* \brief Base class for implementation details of frequency-domain OFDM equalizers.

+ * \ingroup ofdm_blk

+ * \ingroup eq_blk

+ */

+ class DIGITAL_API ofdm_equalizer_base

+ : public boost::enable_shared_from_this<ofdm_equalizer_base>

+ {

+ protected:

+ int d_fft_len;

+ int d_carr_offset;

+

+ public:

+ typedef boost::shared_ptr<ofdm_equalizer_base> sptr;

+

+ ofdm_equalizer_base(int fft_len);

+ ~ofdm_equalizer_base();

+

+ //! Reset the channel information state knowledge

+ virtual void reset() = 0;

+ //! Set the carrier offset in integer multiples

+ void set_carrier_offset(int offset) { d_carr_offset = offset; };

+ virtual void equalize(

+ gr_complex *frame,

+ int n_sym,

+ const std::vector<gr_complex> &initial_taps = std::vector<gr_complex>(),

+ const std::vector<gr_tag_t> &tags = std::vector<gr_tag_t>()) = 0;

+ //! Return the current channel state

+ virtual void get_channel_state(std::vector<gr_complex> &taps) = 0;

+ int fft_len() { return d_fft_len; };

+ sptr base() { return shared_from_this(); };

+ };

+

+

+ /* \brief Base class for implementation details of 1-dimensional OFDM FDEs which use pilot tones.

+ * \ingroup digital

+ *

+ */

+ class DIGITAL_API ofdm_equalizer_1d_pilots : public ofdm_equalizer_base

+ {

+ protected:

+ //! If \p d_occupied_carriers[k][l] is true, symbol k, carrier l is carrying data.

+ // (this is a different format than occupied_carriers!)

+ std::vector<bool> d_occupied_carriers;

+ //! If \p d_pilot_carriers[k][l] is true, symbol k, carrier l is carrying data.

+ // (this is a different format than pilot_carriers!)

+ std::vector<std::vector<bool> > d_pilot_carriers;

+ //! If \p d_pilot_carriers[k][l] is true, d_pilot_symbols[k][l] is its tx'd value.

+ // (this is a different format than pilot_symbols!)

+ std::vector<std::vector<gr_complex> > d_pilot_symbols;

+ //! In case the frame doesn't begin with OFDM symbol 0, this is the index of the first symbol

+ int d_symbols_skipped;

+ //! The current position in the set of pilot symbols

+ int d_pilot_carr_set;

+ //! Vector of length d_fft_len saving the current channel state (on the occupied carriers)

+ std::vector<gr_complex> d_channel_state;

+

+ public:

+ typedef boost::shared_ptr<ofdm_equalizer_1d_pilots> sptr;

+

+ ofdm_equalizer_1d_pilots(

+ int fft_len,

+ const std::vector<std::vector<int> > &occupied_carriers,

+ const std::vector<std::vector<int> > &pilot_carriers,

+ const std::vector<std::vector<gr_complex> > &pilot_symbols,

+ int symbols_skipped,

+ bool input_is_shifted);

+ ~ofdm_equalizer_1d_pilots();

+

+ void reset();

+ void get_channel_state(std::vector<gr_complex> &taps);

+ };

+

+ } /* namespace digital */

+} /* namespace gr */

+

+#endif /* INCLUDED_DIGITAL_OFDM_EQUALIZER_BASE_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_OFDM_EQUALIZER_SIMPLEDFE_H

+#define INCLUDED_DIGITAL_OFDM_EQUALIZER_SIMPLEDFE_H

+

+#include <digital/api.h>

+#include <digital/constellation.h>

+#include <digital/ofdm_equalizer_base.h>

+

+namespace gr {

+ namespace digital {

+

+ /* \brief Simple decision feedback equalizer for OFDM.

+ * \ingroup ofdm_blk

+ * \ingroup eq_blk

+ *

+ * Equalizes an OFDM signal symbol by symbol using knowledge of the

+ * complex modulations symbols.

+ * For every symbol, the following steps are performed:

+ * - On every sub-carrier, decode the modulation symbol

+ * - Use the difference between the decoded symbol and the received symbol

+ * to update the channel state on this carrier

+ * - Whenever a pilot symbol is found, it uses the known pilot symbol to

+ * update the channel state.

+ *

+ * This equalizer makes a lot of assumptions:

+ * - The initial channel state is good enough to decode the first

+ * symbol without error (unless the first symbol only consists of pilot

+ * tones)

+ * - The channel changes only very slowly, such that the channel state

+ * from one symbol is enough to decode the next

+ * - SNR low enough that equalization will always suffice to correctly

+ * decode a symbol

+ * If these assumptions are not met, the most common error is that the

+ * channel state is estimated incorrectly during equalization; after that,

+ * all subsequent symbols will be completely wrong.

+ *

+ * Note that the equalized symbols are *exact points* on the constellation.

+ * This means soft information of the modulation symbols is lost after the

+ * equalization, which is suboptimal for channel codes that use soft decision.

+ *

+ */

+ class DIGITAL_API ofdm_equalizer_simpledfe : public ofdm_equalizer_1d_pilots

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_equalizer_simpledfe> sptr;

+

+ ofdm_equalizer_simpledfe(

+ int fft_len,

+ const gr::digital::constellation_sptr &constellation,

+ const std::vector<std::vector<int> > &occupied_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<int> > &pilot_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<gr_complex> > &pilot_symbols = std::vector<std::vector<gr_complex> >(),

+ int symbols_skipped = 0,

+ float alpha = 0.1,

+ bool input_is_shifted = true);

+

+ ~ofdm_equalizer_simpledfe();

+

+ void equalize(gr_complex *frame,

+ int n_sym,

+ const std::vector<gr_complex> &initial_taps = std::vector<gr_complex>(),

+ const std::vector<gr_tag_t> &tags = std::vector<gr_tag_t>());

+

+ /*

+ * \param fft_len FFT length

+ * \param constellation The constellation object describing the modulation used

+ * on the subcarriers (e.g. QPSK). This is used to decode

+ * the individual symbols.

+ * \param occupied_carriers List of occupied carriers, see ofdm_carrier_allocator

+ * for a description.

+ * \param pilot_carriers Position of pilot symbols, see ofdm_carrier_allocator

+ * for a description.

+ * \param pilot_symbols Value of pilot symbols, see ofdm_carrier_allocator

+ * for a description.

+ * \param alpha Averaging coefficient (in a nutshell, if \f$H_{i,k}\f$ is the channel

+ * state for carrier i and symbol k,

+ * \f$H_{i,k+1} = \alpha H_{i,k} + (1 - \alpha) H_{i,k+1}\f$. Make this

+ * larger if there's more noise, but keep in mind that larger values

+ * of alpha mean slower response to channel changes).

+ * \param symbols_skipped Starting position within occupied_carriers and pilot_carriers.

+ * If the first symbol of the frame was removed (e.g. to decode the

+ * header), set this make sure the pilot symbols are correctly

+ * identified.

+ * \param input_is_shifted Set this to false if the input signal is not shifted, i.e.

+ * the first input items is on the DC carrier.

+ * Note that a lot of the OFDM receiver blocks operate on shifted

+ * signals!

+ */

+ static sptr make(

+ int fft_len,

+ const gr::digital::constellation_sptr &constellation,

+ const std::vector<std::vector<int> > &occupied_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<int> > &pilot_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<gr_complex> > &pilot_symbols = std::vector<std::vector<gr_complex> >(),

+ int symbols_skipped=0,

+ float alpha=0.1,

+ bool input_is_shifted=true

+ );

+

+ private:

+ gr::digital::constellation_sptr d_constellation;

+ //! Averaging coefficient

+ float d_alpha;

+ };

+

+ } /* namespace digital */

+} /* namespace gr */

+

+#endif /* INCLUDED_DIGITAL_OFDM_EQUALIZER_SIMPLEDFE_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_OFDM_EQUALIZER_STATIC_H

+#define INCLUDED_DIGITAL_OFDM_EQUALIZER_STATIC_H

+

+#include <digital/api.h>

+#include <digital/constellation.h>

+#include <digital/ofdm_equalizer_base.h>

+

+namespace gr {

+ namespace digital {

+

+ /* \brief Very simple static equalizer for OFDM.

+ * \ingroup ofdm_blk

+ * \ingroup eq_blk

+ *

+ * This is an extremely simple equalizer. It will only work for high-SNR, very, very

+ * slowly changing channels.

+ * It simply divides the signal with the currently known channel state. Whenever

+ * a pilot symbol comes around, it updates the channel state on that particular

+ * carrier by dividing the received symbol with the known pilot symbol.

+ */

+ class DIGITAL_API ofdm_equalizer_static : public ofdm_equalizer_1d_pilots

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_equalizer_static> sptr;

+

+ ofdm_equalizer_static(

+ int fft_len,

+ const std::vector<std::vector<int> > &occupied_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<int> > &pilot_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<gr_complex> > &pilot_symbols = std::vector<std::vector<gr_complex> >(),

+ int symbols_skipped = 0,

+ bool input_is_shifted = true

+ );

+ ~ofdm_equalizer_static();

+

+ /*! \brief Divide the input signal with the current channel state.

+ *

+ * Does the following (and nothing else):

+ * - Divide every OFDM symbol with the current channel state

+ * - If a pilot symbol is found, re-set the channel state by dividing the received

+ * symbol with the known pilot symbol

+ */

+ void equalize(gr_complex *frame,

+ int n_sym,

+ const std::vector<gr_complex> &initial_taps = std::vector<gr_complex>(),

+ const std::vector<gr_tag_t> &tags = std::vector<gr_tag_t>());

+

+ /*

+ * \param fft_len FFT length

+ * \param occupied_carriers List of occupied carriers, see ofdm_carrier_allocator

+ * for a description.

+ * \param pilot_carriers Position of pilot symbols, see ofdm_carrier_allocator

+ * for a description.

+ * \param pilot_symbols Value of pilot symbols, see ofdm_carrier_allocator

+ * for a description.

+ * \param symbols_skipped Starting position within occupied_carriers and pilot_carriers.

+ * If the first symbol of the frame was removed (e.g. to decode the

+ * header), set this make sure the pilot symbols are correctly

+ * identified.

+ * \param input_is_shifted Set this to false if the input signal is not shifted, i.e.

+ * the first input items is on the DC carrier.

+ * Note that a lot of the OFDM receiver blocks operate on shifted

+ * signals!

+ */

+ static sptr make(

+ int fft_len,

+ const std::vector<std::vector<int> > &occupied_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<int> > &pilot_carriers = std::vector<std::vector<int> >(),

+ const std::vector<std::vector<gr_complex> > &pilot_symbols = std::vector<std::vector<gr_complex> >(),

+ int symbols_skipped = 0,

+ bool input_is_shifted = true

+ );

+ };

+

+ } /* namespace digital */

+} /* namespace gr */

+

+#endif /* INCLUDED_DIGITAL_OFDM_EQUALIZER_STATIC_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_OFDM_FRAME_EQUALIZER_VCVC_H

+#define INCLUDED_OFDM_FRAME_EQUALIZER_VCVC_H

+

+#include <digital/api.h>

+#include <digital/ofdm_equalizer_base.h>

+#include <gr_tagged_stream_block.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief OFDM frame equalizer

+ * \ingroup ofdm

+ *

+ * Performs equalization in one or two dimensions on a tagged OFDM frame.

+ * Input: a tagged series of OFDM symbols.

+ * Output: The same as the input, but equalized.

+ */

+ class DIGITAL_API ofdm_frame_equalizer_vcvc : virtual public gr_tagged_stream_block

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_frame_equalizer_vcvc> sptr;

+

+ /*!

+ * \param equalizer The equalizer object that will do the actual work

+ * \param len_tag_key Length tag key

+ * \param propagate_channel_state If true, the channel state after the last symbol

+ * will be added to the first symbol as a tag

+ */

+ static sptr make(

+ ofdm_equalizer_base::sptr equalizer,

+ const std::string &len_tag_key = "frame_len",

+ bool propagate_channel_state=false

+ );

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_OFDM_FRAME_EQUALIZER_VCVC_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_OFDM_SERIALIZER_VCC_H

+#define INCLUDED_DIGITAL_OFDM_SERIALIZER_VCC_H

+

+#include <digital/api.h>

+#include <gr_tagged_stream_block.h>

+#include <digital/ofdm_carrier_allocator_cvc.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Serializes complex modulations symbols from OFDM sub-carriers

+ * \ingroup ofdm_blk

+ *

+ * This is the inverse block to the carrier_allocator_cvc. It outputs the

+ * complex data symbols as a tagged stream, discarding the pilot symbols.

+ *

+ * If given, two different tags are parsed: The first key (\p len_tag_key)

+ * specifies the number of OFDM symbols in the frame at the input. The

+ * second key (\p packet_len_tag_key) specifies the number of complex symbols

+ * that are coded into this frame. If given, this second key is then used

+ * at the output, otherwise, \p len_tag_key is used.

+ * If both are given, the packet length specifies the maximum number of

+ * output items, and the frame length specifies the exact number of

+ * consumed input items.

+ *

+ * Input: Complex vectors of length \p fft_len

+ * Output: Complex scalars, in the same order as specified in occupied_carriers.

+ */

+ class DIGITAL_API ofdm_serializer_vcc : virtual public gr_tagged_stream_block

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_serializer_vcc> sptr;

+

+ /*!

+ * \param fft_len FFT length

+ * \param occupied_carriers See ofdm_carrier_allocator_cvc.

+ * \param len_tag_key The key of the tag identifying the length of the input frame in OFDM symbols.

+ * \param packet_len_tag_key The key of the tag identifying the number of complex symbols in this packet.

+ * \param symbols_skipped If the first symbol is not allocated as in \p occupied_carriers[0], set this

+ * \param input_is_shifted If the input has the DC carrier on index 0 (i.e. it is not FFT shifted), set this to false

+ */

+ static sptr make(

+ int fft_len,

+ const std::vector<std::vector<int> > &occupied_carriers,

+ const std::string &len_tag_key="frame_len",

+ const std::string &packet_len_tag_key="",

+ int symbols_skipped=0,

+ bool input_is_shifted=true

+ );

+

+ /*!

+ * \param allocator The carrier allocator block of which this shall be the inverse

+ * \param packet_len_tag_key The key of the tag identifying the number of complex symbols in this packet.

+ * \param symbols_skipped If the first symbol is not allocated as in \p occupied_carriers[0], set this

+ * \param input_is_shifted If the input has the DC carrier on index 0 (i.e. it is not FFT shifted), set this to false

+ */

+ static sptr make(

+ const gr::digital::ofdm_carrier_allocator_cvc::sptr &allocator,

+ const std::string &packet_len_tag_key="",

+ int symbols_skipped=0,

+ bool input_is_shifted=true

+ );

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_OFDM_SERIALIZER_VCC_H */

+

+/* -*- c++ -*- */

+/*

+ * Copyright 2013 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_DIGITAL_OFDM_SYNC_SC_CFB_H

+#define INCLUDED_DIGITAL_OFDM_SYNC_SC_CFB_H

+

+#include <digital/api.h>

+#include <gr_hier_block2.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Schmidl & Cox synchronisation for OFDM

+ * \ingroup ofdm_blk

+ * \ingroup sync_blk

+ *

+ * Input: complex samples.

+ * Output 0: Fine frequency offset, scaled by the OFDM symbol duration.

+ * This is \f$\hat{\varphi}\f$ in [1]. The normalized frequency

+ * offset is then 2.0*output0/fft_len.

+ * Output 1: Beginning of the first OFDM symbol after the first (doubled) OFDM

+ * symbol. The beginning is marked with a 1 (it's 0 everywhere else).

+ *

+ * The evaluation of the coarse frequency offset is *not* done in this block.

+ * Also, the initial equalizer taps are not calculated here.

+ *

+ * Note that we use a different normalization factor in the timing metric than

+ * the authors do in their original work[1]. If the timing metric (8) is

+ * \f[

+ * M(d) = \frac{|P(d)|^2}{(R(d))^2},

+ * \f]

+ * we calculate the normalization as

+ * \f[

+ * R(d) = \frac{1}{2} \sum_{k=0}^{N-1} |r_{k+d}|^2,

+ * \f]

+ * i.e., we estimate the energy from *both* half-symbols. This avoids spurious detects

+ * at the end of a burst, when the energy level suddenly drops.

+ *

+ * [1] Schmidl, T.M. and Cox, D.C., "Robust frequency and timing synchronization for OFDM",

+ * Communications, IEEE Transactions on, 1997.

+ */

+ class DIGITAL_API ofdm_sync_sc_cfb : virtual public gr_hier_block2

+ {

+ public:

+ typedef boost::shared_ptr<ofdm_sync_sc_cfb> sptr;

+

+ /*! \param fft_len FFT length

+ * \param cp_len Length of the guard interval (cyclic prefix) in samples

+ */

+ static sptr make(int fft_len, int cp_len);

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_OFDM_SYNC_SC_CFB_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_PACKET_HEADER_DEFAULT_H

+#define INCLUDED_DIGITAL_PACKET_HEADER_DEFAULT_H

+

+#include <gr_tags.h>

+#include <digital/api.h>

+#include <boost/enable_shared_from_this.hpp>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Default header formatter for digital packet transmission.

+ * \ingroup digital

+ *

+ * For bursty/packetized digital transmission, packets are usually prepended

+ * with a packet header, containing the number of bytes etc.

+ * This class is not a block, but a tool to create these packet header.

+ *

+ * This is a default packet header (see header_formatter()) for a description

+ * on the header format). To create other header, derive packet header creator

+ * classes from this function.

+ *

+ * gr::digital::packet_headergenerator_bb uses header generators derived from

+ * this class to create packet headers from data streams.

+ */

+ class DIGITAL_API packet_header_default : public boost::enable_shared_from_this<gr::digital::packet_header_default>

+ {

+ public:

+ typedef boost::shared_ptr<packet_header_default> sptr;

+

+ packet_header_default(

+ long header_len,

+ const std::string &len_tag_key="packet_len",

+ const std::string &num_tag_key="packet_num",

+ int bits_per_byte=1);

+ ~packet_header_default();

+

+ sptr base() { return shared_from_this(); };

+ sptr formatter() { return shared_from_this(); };

+

+ void set_header_num(unsigned header_num) { d_header_number = header_num; };

+ long header_len() { return d_header_len; };

+ pmt::pmt_t len_tag_key() { return d_len_tag_key; };

+

+ /*!

+ * \brief Encodes the header information in the given tags into bits and places them into \p out

+ *

+ * Uses the following header format:

+ * Bits 0-11: The packet length (what was stored in the tag with key \p len_tag_key)

+ * Bits 12-27: The header number (counts up everytime this function is called)

+ * Bit 28: Even parity bit

+ * All other bits: Are set to zero

+ *

+ * If the header length is smaller than 29, bits are simply left out. For this

+ * reason, they always start with the LSB.

+ */

+ bool header_formatter(

+ long packet_len,

+ unsigned char *out,

+ const std::vector<gr_tag_t> &tags=std::vector<gr_tag_t>()

+ );

+

+ /*!

+ * \brief Inverse function to header_formatter().

+ *

+ * Reads the bit stream in \in and writes a corresponding tag into \p tags.

+ *

+ */

+ bool header_parser(

+ const unsigned char *header,

+ std::vector<gr_tag_t> &tags);

+

+ static sptr make(

+ long header_len,

+ const std::string &len_tag_key="packet_len",

+ const std::string &num_tag_key="packet_num",

+ int bits_per_byte=1);

+

+ protected:

+ long d_header_len;

+ pmt::pmt_t d_len_tag_key;

+ pmt::pmt_t d_num_tag_key;

+ int d_bits_per_byte;

+ unsigned d_header_number;

+ unsigned d_mask;

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_PACKET_HEADER_DEFAULT_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_PACKET_HEADER_OFDM_H

+#define INCLUDED_DIGITAL_PACKET_HEADER_OFDM_H

+

+#include <vector>

+#include <digital/api.h>

+#include <digital/packet_header_default.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Header utility for OFDM signals.

+ * \ingroup ofdm_blk

+ *

+ */

+ class DIGITAL_API packet_header_ofdm : public packet_header_default

+ {

+ public:

+ typedef boost::shared_ptr<packet_header_ofdm> sptr;

+

+ packet_header_ofdm(

+ const std::vector<std::vector<int> > &occupied_carriers,

+ int n_syms,

+ const std::string &len_tag_key="packet_len",

+ const std::string &frame_len_tag_key="frame_len",

+ const std::string &num_tag_key="packet_num",

+ int bits_per_sym=1);

+ ~packet_header_ofdm();

+

+ /*!

+ * \brief Inverse function to header_formatter().

+ *

+ * Does the same as packet_header_default::header_parser(), but

+ * adds another tag that stores the number of OFDM symbols in the

+ * packet.

+ * Note that there is usually no linear connection between the number

+ * of OFDM symbols and the packet length, because, a packet might

+ * finish mid-OFDM-symbol.

+ */

+ bool header_parser(

+ const unsigned char *header,

+ std::vector<gr_tag_t> &tags);

+

+ static sptr make(

+ const std::vector<std::vector<int> > &occupied_carriers,

+ int n_syms,

+ const std::string &len_tag_key="packet_len",

+ const std::string &frame_len_tag_key="frame_len",

+ const std::string &num_tag_key="packet_num",

+ int bits_per_sym=1);

+

+

+ protected:

+ pmt::pmt_t d_frame_len_tag_key;

+ const std::vector<std::vector<int> > d_occupied_carriers; //!< Which carriers/symbols carry data

+ int d_syms_per_set; //!< Helper variable: Total number of elements in d_occupied_carriers

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_PACKET_HEADER_OFDM_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_PACKET_HEADERGENERATOR_BB_H

+#define INCLUDED_PACKET_HEADERGENERATOR_BB_H

+

+#include <digital/api.h>

+#include <gr_tagged_stream_block.h>

+#include <digital/packet_header_default.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Generates a header for a tagged, streamed packet.

+ * \ingroup digital

+ *

+ * Input: A tagged stream. This is consumed entirely, it is not appended

+ * to the output stream.

+ * Output: An tagged stream containing the header. The details on the header

+ * are set in a header formatter object (of type packet_header_default

+ * or a subclass thereof). If only a number of bits is specified, a

+ * default header is generated (see packet_header_default).

+ */

+ class DIGITAL_API packet_headergenerator_bb : virtual public gr_tagged_stream_block

+ {

+ public:

+ typedef boost::shared_ptr<packet_headergenerator_bb> sptr;

+

+ /* \param header_formatter A header formatter object.

+ * \param len_tag_key Length tag key. Note that for header generation,

+ * it is irrelevant which tag names are set in the

+ * formatter object, only this value is relevant!

+ */

+ static sptr make(

+ const packet_header_default::sptr &header_formatter,

+ const std::string &len_tag_key="packet_len"

+ );

+

+ /* \param header_len If this value is given, a packet_header_default

+ * object is used to generate the header. This is

+ * the number of bits per header.

+ * \param len_tag_key Length tag key.

+ */

+ static sptr make(

+ long header_len,

+ const std::string &len_tag_key = "packet_len");

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_PACKET_HEADERGENERATOR_BB_H */

+

+/* -*- c++ -*- */

+/* Copyright 2012 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_DIGITAL_PACKET_HEADERPARSER_B_H

+#define INCLUDED_DIGITAL_PACKET_HEADERPARSER_B_H

+

+#include <digital/api.h>

+#include <gr_sync_block.h>

+#include <digital/packet_header_default.h>

+

+namespace gr {

+ namespace digital {

+

+ /*!

+ * \brief Post header metadata as a PMT

+ * \ingroup digital

+ *

+ * In a sense, this is the inverse block to packet_headergenerator_bb.

+ * The difference is, the parsed header is not output as a stream,

+ * but as a PMT dictionary, which is published to message port with

+ * the id "header_data".

+ * The dictionary consists of the tags created by the header formatter

+ * object. You should be able to use the exact same formatter object

+ * as used on the Tx side in the packet_headergenerator_bb.

+ *

+ * If only a header length is given, this block uses the default header

+ * format.

+ */

+ class DIGITAL_API packet_headerparser_b : virtual public gr_sync_block

+ {

+ public:

+ typedef boost::shared_ptr<packet_headerparser_b> sptr;

+

+ /*!

+ * \param header_formatter Header object. This should be the same as used for

+ * packet_headergenerator_bb.

+ */

+ static sptr make(const gr::digital::packet_header_default::sptr &header_formatter);

+

+ /*!

+ * \param header_len Number of bytes per header

+ * \param len_tag_key Length Tag Key

+ */

+ static sptr make(long header_len, const std::string &len_tag_key);

+ };

+

+ } // namespace digital

+} // namespace gr

+

+#endif /* INCLUDED_DIGITAL_PACKET_HEADERPARSER_B_H */

+

+ ${GR_BLOCKS_INCLUDE_DIRS}

+ ${GNURADIO_RUNTIME_INCLUDE_DIRS}

+ ${LOG4CPP_INCLUDE_DIRS}

+link_directories(${LOG4CPP_LIBRARY_DIRS})

+sys.path.append('${GR_RUNTIME_PYTHONPATH}')

+ constellation.cc

+ constellation_receiver_cb_impl.cc

+ crc32.cc

+ crc32_bb_impl.cc

+ glfsr.cc

+ header_payload_demux_impl.cc

+ mpsk_snr_est.cc

+ ofdm_carrier_allocator_cvc_impl.cc

+ ofdm_chanest_vcvc_impl.cc

+ ofdm_equalizer_base.cc

+ ofdm_equalizer_simpledfe.cc

+ ofdm_equalizer_static.cc

+ ofdm_frame_equalizer_vcvc_impl.cc

+ ofdm_serializer_vcc_impl.cc

+ ofdm_sync_sc_cfb_impl.cc

+ packet_header_default.cc

+ packet_header_ofdm.cc

+ packet_headergenerator_bb_impl.cc

+ packet_headerparser_b_impl.cc

+ simple_framer_impl.cc

+ header_payload_demux_impl.cc

+ gnuradio-runtime

+ ${LOG4CPP_LIBRARIES}

+

+add_dependencies(

+ gnuradio-digital

+ digital_generated_includes

+ digital_generated_swigs

+ gnuradio-runtime

+ gnuradio-filter

+ gnuradio-analog

+ gnuradio-blocks

+)

+ blocks::control_loop(loop_bw, fmax, fmin),

+#include <attributes.h>

+#include <blocks/control_loop.h>

+ : public constellation_receiver_cb, blocks::control_loop

+ blocks::control_loop(loop_bw, 1.0, -1.0),

+ class costas_loop_cc_impl : public costas_loop_cc

+/* -*- c++ -*- */

+/*

+ * Copyright 2013 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 <gr_io_signature.h>

+#include "crc32_bb_impl.h"

+#include <digital/crc32.h>

+

+namespace gr {

+ namespace digital {

+

+ crc32_bb::sptr

+ crc32_bb::make(bool check, const std::string& lengthtagname)

+ {

+ return gnuradio::get_initial_sptr (new crc32_bb_impl(check, lengthtagname));

+ }

+

+ crc32_bb_impl::crc32_bb_impl(bool check, const std::string& lengthtagname)

+ : gr_tagged_stream_block("crc32_bb",

+ gr_make_io_signature(1, 1, sizeof (char)),

+ gr_make_io_signature(1, 1, sizeof (char)),

+ lengthtagname),

+ d_check(check)

+ {

+ set_tag_propagation_policy(TPP_DONT);

+ }

+

+ crc32_bb_impl::~crc32_bb_impl()

+ {

+ }

+

+ int

+ crc32_bb_impl::calculate_output_stream_length(const gr_vector_int &ninput_items)

+ {

+ if (d_check) {

+ return ninput_items[0] - 4;

+ } else {

+ return ninput_items[0] + 4;

+ }

+ }

+

+ int

+ crc32_bb_impl::work (int noutput_items,

+ gr_vector_int &ninput_items,

+ gr_vector_const_void_star &input_items,

+ gr_vector_void_star &output_items)

+ {

+ const unsigned char *in = (const unsigned char *) input_items[0];

+ unsigned char *out = (unsigned char *) output_items[0];

+ long packet_length = ninput_items[0];

+ int packet_size_diff = d_check ? -4 : 4;

+ unsigned int crc;

+

+ if (d_check) {

+ crc = gr::digital::crc32(in, packet_length-4);

+ if (crc != *(unsigned int *)(in+packet_length-4)) { // Drop package

+ return 0;

+ }

+ memcpy((void *) out, (const void *) in, packet_length-4);

+ } else {

+ crc = gr::digital::crc32(in, packet_length);

+ memcpy((void *) out, (const void *) in, packet_length);

+ memcpy((void *) (out + packet_length), &crc, 4); // FIXME big-endian/little-endian, this might be wrong

+ }

+