1 files changed, 93 insertions, 0 deletions
diff --git a/gr-digital/python/digital/qa_cpm.py b/gr-digital/python/digital/qa_cpm.py
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+++ b/gr-digital/python/digital/qa_cpm.py
@@ -0,0 +1,93 @@
+#!/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 as digital
+import analog_swig as analog
+import blocks_swig as blocks
+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.cpmmod_bc(type, 0.5, sps, L)
+        arg = blocks.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(analog.cpm.LRC, 'LREC')
+
+    def test_001_lrc(self):
+        self.do_check_phase_shift(analog.cpm.LRC, 'LRC')
+
+    def test_001_lsrc(self):
+        self.do_check_phase_shift(analog.cpm.LSRC, 'LSRC')
+
+    def test_001_ltfm(self):
+        self.do_check_phase_shift(analog.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.gmskmod_bc(sps, L, bt)
+        arg = blocks.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 = analog.cpm.phase_response(analog.cpm.LREC, 2, 4)
+        self.assertAlmostEqual(numpy.sum(phase_response), 1)
+
+
+if __name__ == '__main__':
+    gr_unittest.run(test_cpm, "test_cpm.xml")
+