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#!/usr/bin/env python
#
# Copyright 2011,2013 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
import random
import cmath
import time
from gnuradio import gr, gr_unittest, filter, digital, blocks
class test_pfb_clock_sync(gr_unittest.TestCase):
def setUp(self):
random.seed(0)
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
def test01(self):
# Test BPSK sync
excess_bw = 0.35
sps = 4
loop_bw = cmath.pi / 100.0
nfilts = 32
init_phase = nfilts / 2
max_rate_deviation = 0.5
osps = 1
ntaps = 11 * int(sps * nfilts)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw, ntaps)
self.test = digital.pfb_clock_sync_ccf(sps, loop_bw, taps,
nfilts, init_phase,
max_rate_deviation,
osps)
data = 10000 * [complex(1, 0), complex(-1, 0)]
self.src = blocks.vector_source_c(data, False)
# pulse shaping interpolation filter
rrc_taps = filter.firdes.root_raised_cosine(
nfilts, # gain
nfilts, # sampling rate based on 32 filters in resampler
1.0, # symbol rate
excess_bw, # excess bandwidth (roll-off factor)
ntaps)
self.rrc_filter = filter.pfb_arb_resampler_ccf(sps, rrc_taps)
self.snk = blocks.vector_sink_c()
self.tb.connect(self.src, self.rrc_filter, self.test, self.snk)
self.tb.run()
expected_result = 10000 * [complex(1, 0), complex(-1, 0)]
dst_data = self.snk.data()
# Only compare last Ncmp samples
Ncmp = 1000
len_e = len(expected_result)
len_d = len(dst_data)
expected_result = expected_result[len_e - Ncmp:]
dst_data = dst_data[len_d - Ncmp:]
# for e,d in zip(expected_result, dst_data):
# print e, d
self.assertComplexTuplesAlmostEqual(expected_result, dst_data, 1)
def test02(self):
# Test real BPSK sync
excess_bw = 0.35
sps = 4
loop_bw = cmath.pi / 100.0
nfilts = 32
init_phase = nfilts / 2
max_rate_deviation = 0.5
osps = 1
ntaps = 11 * int(sps * nfilts)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw, ntaps)
self.test = digital.pfb_clock_sync_fff(sps, loop_bw, taps,
nfilts, init_phase,
max_rate_deviation,
osps)
data = 10000 * [1, -1]
self.src = blocks.vector_source_f(data, False)
# pulse shaping interpolation filter
rrc_taps = filter.firdes.root_raised_cosine(
nfilts, # gain
nfilts, # sampling rate based on 32 filters in resampler
1.0, # symbol rate
excess_bw, # excess bandwidth (roll-off factor)
ntaps)
self.rrc_filter = filter.pfb_arb_resampler_fff(sps, rrc_taps)
self.snk = blocks.vector_sink_f()
self.tb.connect(self.src, self.rrc_filter, self.test, self.snk)
self.tb.run()
expected_result = 10000 * [1, -1]
dst_data = self.snk.data()
# Only compare last Ncmp samples
Ncmp = 1000
len_e = len(expected_result)
len_d = len(dst_data)
expected_result = expected_result[len_e - Ncmp:]
dst_data = dst_data[len_d - Ncmp:]
# for e,d in zip(expected_result, dst_data):
# print e, d
self.assertFloatTuplesAlmostEqual(expected_result, dst_data, 1)
def test03(self):
# Test resting of taps
excess_bw0 = 0.35
excess_bw1 = 0.22
sps = 4
loop_bw = cmath.pi / 100.0
nfilts = 32
init_phase = nfilts / 2
max_rate_deviation = 0.5
osps = 1
ntaps = 11 * int(sps * nfilts)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw0, ntaps)
self.test = digital.pfb_clock_sync_ccf(sps, loop_bw, taps,
nfilts, init_phase,
max_rate_deviation,
osps)
self.src = blocks.null_source(gr.sizeof_gr_complex)
self.snk = blocks.null_sink(gr.sizeof_gr_complex)
self.tb.connect(self.src, self.test, self.snk)
self.tb.start()
time.sleep(0.1)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw1, ntaps)
self.test.update_taps(taps)
self.tb.stop()
self.tb.wait()
self.assertTrue(True)
def test03_f(self):
# Test resting of taps
excess_bw0 = 0.35
excess_bw1 = 0.22
sps = 4
loop_bw = cmath.pi / 100.0
nfilts = 32
init_phase = nfilts / 2
max_rate_deviation = 0.5
osps = 1
ntaps = 11 * int(sps * nfilts)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw0, ntaps)
self.test = digital.pfb_clock_sync_fff(sps, loop_bw, taps,
nfilts, init_phase,
max_rate_deviation,
osps)
self.src = blocks.null_source(gr.sizeof_float)
self.snk = blocks.null_sink(gr.sizeof_float)
self.tb.connect(self.src, self.test, self.snk)
self.tb.start()
time.sleep(0.1)
taps = filter.firdes.root_raised_cosine(nfilts, nfilts * sps,
1.0, excess_bw1, ntaps)
self.test.update_taps(taps)
self.tb.stop()
self.tb.wait()
self.assertTrue(True)
if __name__ == '__main__':
gr_unittest.run(test_pfb_clock_sync)
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