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authorjcorgan2008-04-15 21:31:29 +0000
committerjcorgan2008-04-15 21:31:29 +0000
commita52f9a19581901beabc9111917965b9817231014 (patch)
tree5e12980ed7d22dbc8c0f963579e3855b88df5897 /gnuradio-core/src/python
parent42b48770e756f1c082f5dfc9e757fafe69263496 (diff)
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Merged r8195:8205 from jcorgan/ecc into trunk. Adds convolutional encoder
and decoder corresponding to the R=1/2, K=7 CCSDS standard ("Voyager"). This code is a GNU Radio wrapper around a 1995-era KA9Q portable-C implementation, and is designed for continuous streaming data, not packets. The encoder takes MSB packed bytes and outputs channel symbols 0 or 1. The decoder uses soft-decision Viterbi decoding on a floating point stream of (possibly noise corrupted) [1.0, 1.0] symbols, and outputs MSB packed decoded bytes. Benchmarking on a 2.16 GHz Intel Core 2 Duo shows 4.7 Mbps decoding rate at 100% CPU usage (single core). (There is a newer KA9Q library that implements SIMD speed ups with correspondingly faster performance.) The KA9Q library is placed into src/lib/viterbi. It could use some cleanup, file/function renaming, and refactoring, or even replacement with the newer libfec code that is available. git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@8206 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gnuradio-core/src/python')
-rw-r--r--gnuradio-core/src/python/gnuradio/gr/Makefile.am1
-rwxr-xr-xgnuradio-core/src/python/gnuradio/gr/qa_ecc_ccsds_27.py50
2 files changed, 51 insertions, 0 deletions
diff --git a/gnuradio-core/src/python/gnuradio/gr/Makefile.am b/gnuradio-core/src/python/gnuradio/gr/Makefile.am
index 5aaef2540..7a317a1a3 100644
--- a/gnuradio-core/src/python/gnuradio/gr/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/gr/Makefile.am
@@ -49,6 +49,7 @@ noinst_PYTHON = \
qa_agc.py \
qa_argmax.py \
qa_bin_statistics.py \
+ qa_ecc_ccsds27.py \
qa_cma_equalizer.py \
qa_complex_to_xxx.py \
qa_constellation_decoder_cb.py \
diff --git a/gnuradio-core/src/python/gnuradio/gr/qa_ecc_ccsds_27.py b/gnuradio-core/src/python/gnuradio/gr/qa_ecc_ccsds_27.py
new file mode 100755
index 000000000..f02c1a323
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/gr/qa_ecc_ccsds_27.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+#
+# Copyright 2004,2007 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 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
+
+class test_ccsds_27 (gr_unittest.TestCase):
+
+ def setUp (self):
+ self.tb = gr.top_block ()
+
+ def tearDown (self):
+ self.tb = None
+
+ def test_ccsds_27 (self):
+ src_data = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+ expected = (0, 0, 0, 0, 1, 2, 3, 4, 5, 6)
+ src = gr.vector_source_b(src_data)
+ enc = gr.encode_ccsds_27_bb()
+ b2f = gr.char_to_float()
+ add = gr.add_const_ff(-0.5)
+ mul = gr.multiply_const_ff(2.0)
+ dec = gr.decode_ccsds_27_fb()
+ dst = gr.vector_sink_b()
+ self.tb.connect(src, enc, b2f, add, mul, dec, dst)
+ self.tb.run()
+ dst_data = dst.data()
+ self.assertEqual(expected, dst_data)
+
+
+if __name__ == '__main__':
+ gr_unittest.main ()