+#!/usr/bin/env python
+#
+# Copyright 2007 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 2, 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
+
+class test_glfsr_source(gr_unittest.TestCase):
+
+ def setUp (self):
+ self.fg = gr.flow_graph ()
+
+ def tearDown (self):
+ self.fg = None
+
+ def test_000_make_b(self):
+ src = gr.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 = gr.glfsr_source_b(degree, False)
+ b2f = gr.chunks_to_symbols_bf((-1.0,1.0), 1)
+ dst = gr.vector_sink_f()
+ self.fg.connect(src, b2f, dst)
+ self.fg.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 test_003_make_f(self):
+ src = gr.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 = gr.glfsr_source_f(degree, False)
+ dst = gr.vector_sink_f()
+ self.fg.connect(src, dst)
+ self.fg.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.main ()