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#!/usr/bin/env python
#
# Copyright 2007,2010,2012 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.
#
from gnuradio import gr, gr_unittest
import digital_swig as digital
class test_glfsr_source(gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_000_make_b(self):
src = digital.glfsr_source_b(16)
self.assertEquals(src.mask(), 0x8016)
self.assertEquals(src.period(), 2**16-1)
def test_001_degree_b(self):
self.assertRaises(RuntimeError,
lambda: gr.glfsr_source_b(0))
self.assertRaises(RuntimeError,
lambda: gr.glfsr_source_b(33))
def test_002_correlation_b(self):
for degree in range(1,11): # Higher degrees take too long to correlate
src = digital.glfsr_source_b(degree, False)
b2f = digital.chunks_to_symbols_bf((-1.0,1.0), 1)
dst = gr.vector_sink_f()
del self.tb # Discard existing top block
self.tb = gr.top_block()
self.tb.connect(src, b2f, dst)
self.tb.run()
self.tb.disconnect_all()
actual_result = dst.data()
R = auto_correlate(actual_result)
self.assertEqual(R[0], float(len(R))) # Auto-correlation peak at origin
for i in range(len(R)-1):
self.assertEqual(R[i+1], -1.0) # Auto-correlation minimum everywhere else
def test_003_make_f(self):
src = digital.glfsr_source_f(16)
self.assertEquals(src.mask(), 0x8016)
self.assertEquals(src.period(), 2**16-1)
def test_004_degree_f(self):
self.assertRaises(RuntimeError,
lambda: gr.glfsr_source_f(0))
self.assertRaises(RuntimeError,
lambda: gr.glfsr_source_f(33))
def test_005_correlation_f(self):
for degree in range(1,11): # Higher degrees take too long to correlate
src = digital.glfsr_source_f(degree, False)
dst = gr.vector_sink_f()
del self.tb # Discard existing top block
self.tb = gr.top_block()
self.tb.connect(src, dst)
self.tb.run()
actual_result = dst.data()
R = auto_correlate(actual_result)
self.assertEqual(R[0], float(len(R))) # Auto-correlation peak at origin
for i in range(len(R)-1):
self.assertEqual(R[i+1], -1.0) # Auto-correlation minimum everywhere else
def auto_correlate(data):
l = len(data)
R = [0,]*l
for lag in range(l):
for i in range(l):
R[lag] += data[i]*data[i-lag]
return R
if __name__ == '__main__':
gr_unittest.run(test_glfsr_source, "test_glfsr_source.xml")
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