#!/usr/bin/env python
# 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.
#
import numpy
from gnuradio import gr, gr_unittest
try: import pmt
except: from gruel import pmt
import digital_swig as digital
class qa_ofdm_frame_equalizer_vcvc (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_001_simple (self):
""" Very simple functionality testing """
fft_len = 8
equalizer = digital.ofdm_equalizer_static(fft_len)
n_syms = 3
len_tag_key = "frame_len"
tx_data = (1,) * fft_len * n_syms
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(n_syms)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, (1,) * fft_len)
src = gr.vector_source_c(tx_data, False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), len_tag_key)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
# Check data
self.assertEqual(tx_data, sink.data())
for tag in sink.tags():
self.assertEqual(pmt.pmt_symbol_to_string(tag.key), len_tag_key)
self.assertEqual(pmt.pmt_to_long(tag.value), n_syms)
def test_002_static (self):
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
len_tag_key = "frame_len"
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(4)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, channel[:fft_len])
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), len_tag_key, True)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
for tag in sink.tags():
if pmt.pmt_symbol_to_string(tag.key) == len_tag_key:
self.assertEqual(pmt.pmt_to_long(tag.value), 4)
if pmt.pmt_symbol_to_string(tag.key) == "ofdm_sync_chan_taps":
self.assertEqual(list(pmt.pmt_c32vector_elements(tag.value)), channel[-fft_len:])
def test_002_simpledfe (self):
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_simpledfe(
fft_len, cnst.base(), occupied_carriers, pilot_carriers, pilot_symbols, 0, 0.01
)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
len_tag_key = "frame_len"
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(4)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, channel[:fft_len])
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), len_tag_key, True)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
for tag in sink.tags():
if pmt.pmt_symbol_to_string(tag.key) == len_tag_key:
self.assertEqual(pmt.pmt_to_long(tag.value), 4)
if pmt.pmt_symbol_to_string(tag.key) == "ofdm_sync_chan_taps":
self.assertComplexTuplesAlmostEqual(list(pmt.pmt_c32vector_elements(tag.value)), channel[-fft_len:], places=1)
if __name__ == '__main__':
gr_unittest.run(qa_ofdm_frame_equalizer_vcvc, "qa_ofdm_frame_equalizer_vcvc.xml")