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diff --git a/gr-digital/python/digital/qa_ofdm_txrx.py b/gr-digital/python/digital/qa_ofdm_txrx.py
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+++ b/gr-digital/python/digital/qa_ofdm_txrx.py
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+#!/usr/bin/env python
+#
+# 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.
+# 
+
+import random
+import numpy
+
+from gnuradio import gr, gr_unittest, digital, blocks, channels
+from gnuradio.digital.ofdm_txrx import ofdm_tx, ofdm_rx
+from gnuradio.digital.utils import tagged_streams
+
+# Set this to true if you need to write out data
+LOG_DEBUG_INFO=False
+
+class ofdm_tx_fg (gr.top_block):
+    def __init__(self, data, len_tag_key):
+        gr.top_block.__init__(self, "ofdm_tx")
+        tx_data, tags = tagged_streams.packets_to_vectors((data,), len_tag_key)
+        src = blocks.vector_source_b(data, False, 1, tags)
+        self.tx = ofdm_tx(packet_length_tag_key=len_tag_key, debug_log=LOG_DEBUG_INFO)
+        self.sink = blocks.vector_sink_c()
+        self.connect(src, self.tx, self.sink)
+
+    def get_tx_samples(self):
+        return self.sink.data()
+
+class ofdm_rx_fg (gr.top_block):
+    def __init__(self, samples, len_tag_key, channel=None, prepend_zeros=100):
+        gr.top_block.__init__(self, "ofdm_rx")
+        if prepend_zeros:
+            samples = (0,) * prepend_zeros + tuple(samples)
+        src = blocks.vector_source_c(tuple(samples) + (0,) * 1000)
+        self.rx = ofdm_rx(frame_length_tag_key=len_tag_key, debug_log=LOG_DEBUG_INFO)
+        if channel is not None:
+            self.connect(src, channel, self.rx)
+        else:
+            self.connect(src, self.rx)
+        self.sink = blocks.vector_sink_b()
+        self.connect(self.rx, self.sink)
+
+    def get_rx_bytes(self):
+        return self.sink.data()
+
+class test_ofdm_txrx (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+
+    def tearDown (self):
+        self.tb = None
+
+    def test_001_tx (self):
+        """ Just make sure the Tx works in general """
+        len_tag_key = 'frame_len'
+        n_bytes = 52
+        n_samples_expected = (numpy.ceil(1.0 * (n_bytes + 4) / 6) + 3) * 80
+        test_data = [random.randint(0, 255) for x in range(n_bytes)]
+        tx_data, tags = tagged_streams.packets_to_vectors((test_data,), len_tag_key)
+        src = blocks.vector_source_b(test_data, False, 1, tags)
+        tx = ofdm_tx(packet_length_tag_key=len_tag_key)
+        tx_fg = ofdm_tx_fg(test_data, len_tag_key)
+        tx_fg.run()
+        self.assertEqual(len(tx_fg.get_tx_samples()), n_samples_expected)
+
+    def test_002_rx_only_noise(self):
+        """ Run the RX with only noise, check it doesn't crash
+        or return a burst. """
+        len_tag_key = 'frame_len'
+        samples = (0,) * 1000
+        channel = channels.channel_model(0.1)
+        rx_fg = ofdm_rx_fg(samples, len_tag_key, channel)
+        rx_fg.run()
+        self.assertEqual(len(rx_fg.get_rx_bytes()), 0)
+
+    def test_003_tx1packet(self):
+        """ Transmit one packet, with slight AWGN and slight frequency + timing offset.
+        Check packet is received and no bit errors have occurred. """
+        len_tag_key = 'frame_len'
+        n_bytes = 21
+        fft_len = 64
+        test_data = tuple([random.randint(0, 255) for x in range(n_bytes)])
+        # 1.0/fft_len is one sub-carrier, a fine freq offset stays below that
+        freq_offset = 1.0 / fft_len * 0.7
+        #channel = channels.channel_model(0.01, freq_offset)
+        channel = None
+        # Tx
+        tx_fg = ofdm_tx_fg(test_data, len_tag_key)
+        tx_fg.run()
+        tx_samples = tx_fg.get_tx_samples()
+        # Rx
+        rx_fg = ofdm_rx_fg(tx_samples, len_tag_key, channel, prepend_zeros=100)
+        rx_fg.run()
+        rx_data = rx_fg.get_rx_bytes()
+        self.assertEqual(tuple(tx_fg.tx.sync_word1), tuple(rx_fg.rx.sync_word1))
+        self.assertEqual(tuple(tx_fg.tx.sync_word2), tuple(rx_fg.rx.sync_word2))
+        self.assertEqual(test_data, rx_data)
+
+    def test_004_tx1packet_large_fO(self):
+        """ Transmit one packet, with slight AWGN and large frequency offset.
+        Check packet is received and no bit errors have occurred. """
+        fft_len = 64
+        len_tag_key = 'frame_len'
+        n_bytes = 21
+        test_data = tuple([random.randint(0, 255) for x in range(n_bytes)])
+        #test_data = tuple([255 for x in range(n_bytes)])
+        # 1.0/fft_len is one sub-carrier
+        frequency_offset = 1.0 / fft_len * 2.5
+        channel = channels.channel_model(0.00001, frequency_offset)
+        # Tx
+        tx_fg = ofdm_tx_fg(test_data, len_tag_key)
+        tx_fg.run()
+        tx_samples = tx_fg.get_tx_samples()
+        # Rx
+        rx_fg = ofdm_rx_fg(tx_samples, len_tag_key, channel, prepend_zeros=100)
+        rx_fg.run()
+        rx_data = rx_fg.get_rx_bytes()
+        self.assertEqual(test_data, rx_data)
+
+if __name__ == '__main__':
+    gr_unittest.run(test_ofdm_txrx, "test_ofdm_txrx.xml")
+