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#!/usr/bin/env python
#
# Copyright 2007,2010,2012,2013 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gr, gr_unittest, digital, blocks
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.assertEqual(src.mask(), 0x8016)
self.assertEqual(src.period(), 2**16 - 1)
def test_001_degree_b(self):
self.assertRaises(RuntimeError,
lambda: digital.glfsr_source_b(0))
self.assertRaises(RuntimeError,
lambda: digital.glfsr_source_b(65))
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 = blocks.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)
# Auto-correlation peak at origin
self.assertEqual(R[0], float(len(R)))
for i in range(len(R) - 1):
# Auto-correlation minimum everywhere else
self.assertEqual(R[i + 1], -1.0)
def test_003_make_f(self):
src = digital.glfsr_source_f(16)
self.assertEqual(src.mask(), 0x8016)
self.assertEqual(src.period(), 2**16 - 1)
def test_004_degree_f(self):
self.assertRaises(RuntimeError,
lambda: digital.glfsr_source_f(0))
self.assertRaises(RuntimeError,
lambda: digital.glfsr_source_f(65))
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 = blocks.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)
# Auto-correlation peak at origin
self.assertEqual(R[0], float(len(R)))
for i in range(len(R) - 1):
# Auto-correlation minimum everywhere else
self.assertEqual(R[i + 1], -1.0)
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)
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