1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
#!/usr/bin/env python
#
# Copyright 2010 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
import numpy
class test_cpm(gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def do_check_phase_shift(self, type, name):
sps = 2
L = 1
in_bits = (1,) * 20
src = gr.vector_source_b(in_bits, False)
cpm = digital_swig.cpmmod_bc(type, 0.5, sps, L)
arg = gr.complex_to_arg()
sink = gr.vector_sink_f()
self.tb.connect(src, cpm, arg, sink)
self.tb.run()
symbol_phases = numpy.array(sink.data()[sps*L-1::sps])
phase_diff = numpy.mod(numpy.subtract(symbol_phases[1:], symbol_phases[:-1]),
(2*numpy.pi,) * (len(symbol_phases)-1))
self.assertFloatTuplesAlmostEqual(tuple(phase_diff), (0.5 * numpy.pi,) * len(phase_diff), 5,
msg="Phase shift was not correct for CPM method " + name)
def test_001_lrec(self):
self.do_check_phase_shift(gr.cpm.LRC, 'LREC')
def test_001_lrc(self):
self.do_check_phase_shift(gr.cpm.LRC, 'LRC')
def test_001_lsrc(self):
self.do_check_phase_shift(gr.cpm.LSRC, 'LSRC')
def test_001_ltfm(self):
self.do_check_phase_shift(gr.cpm.TFM, 'TFM')
def test_001_lgmsk(self):
sps = 2
L = 5
bt = 0.3
in_bits = (1,) * 20
src = gr.vector_source_b(in_bits, False)
gmsk = digital_swig.gmskmod_bc(sps, bt, L)
arg = gr.complex_to_arg()
sink = gr.vector_sink_f()
self.tb.connect(src, gmsk, arg, sink)
self.tb.run()
symbol_phases = numpy.array(sink.data()[sps*L-1::sps])
phase_diff = numpy.mod(numpy.subtract(symbol_phases[1:], symbol_phases[:-1]),
(2*numpy.pi,) * (len(symbol_phases)-1))
self.assertFloatTuplesAlmostEqual(tuple(phase_diff), (0.5 * numpy.pi,) * len(phase_diff), 5,
msg="Phase shift was not correct for GMSK")
def test_phase_response(self):
phase_response = gr.cpm.phase_response(gr.cpm.LREC, 2, 4)
self.assertAlmostEqual(numpy.sum(phase_response), 1)
if __name__ == '__main__':
gr_unittest.run(test_cpm, "test_cpm.xml")
|
