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#!/usr/bin/env python
#
# Copyright 2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, gr_unittest
import digital_swig as digital
import random, cmath
class test_pfb_clock_sync(gr_unittest.TestCase):
def setUp (self):
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 = 1.5
osps = 1
ntaps = 11 * int(sps*nfilts)
taps = gr.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 = 1000*[complex(1,0), complex(-1,0)]
self.src = gr.vector_source_c(data, False)
# pulse shaping interpolation filter
rrc_taps = gr.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 = gr.pfb_arb_resampler_ccf(sps, rrc_taps)
self.snk = gr.vector_sink_c()
self.tb.connect(self.src, self.rrc_filter, self.test, self.snk)
self.tb.run()
expected_result = 1000*[complex(-1,0), complex(1,0)]
dst_data = self.snk.data()
# Only compare last Ncmp samples
Ncmp = 100
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 = 1.5
osps = 1
ntaps = 11 * int(sps*nfilts)
taps = gr.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 = 1000*[1, -1]
self.src = gr.vector_source_f(data, False)
# pulse shaping interpolation filter
rrc_taps = gr.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 = gr.pfb_arb_resampler_fff(sps, rrc_taps)
self.snk = gr.vector_sink_f()
self.tb.connect(self.src, self.rrc_filter, self.test, self.snk)
self.tb.run()
expected_result = 1000*[-1, 1]
dst_data = self.snk.data()
# Only compare last Ncmp samples
Ncmp = 100
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)
if __name__ == '__main__':
gr_unittest.run(test_pfb_clock_sync, "test_pfb_clock_sync.xml")
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