From f450ed2d99672832eb8ca10af4c3be9a1dc81a96 Mon Sep 17 00:00:00 2001
From: Ben Reynwar <ben@reynwar.net>
Date: Tue, 1 Feb 2011 13:02:42 -0700
Subject: Forgot to add qpsk.py in last commit.
---
.../src/python/gnuradio/blks2impl/qpsk.py | 79 ++++++++++++++++++++++
1 file changed, 79 insertions(+)
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/qpsk.py
(limited to 'gnuradio-core/src/python/gnuradio/blks2impl')
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/qpsk.py b/gnuradio-core/src/python/gnuradio/blks2impl/qpsk.py
new file mode 100644
index 0000000000..f62ae232c3
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/qpsk.py
@@ -0,0 +1,79 @@
+#
+# Copyright 2005,2006 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.
+#
+
+"""
+QPSK modulation.
+
+Demodulation is not included since the generic_mod_demod
+doesn't work for non-differential encodings.
+"""
+
+from gnuradio import gr, modulation_utils2
+from gnuradio.blks2impl.generic_mod_demod import generic_mod
+
+
+# Default number of points in constellation.
+_def_constellation_points = 4
+# Whether differential coding is used.
+_def_differential = False
+_def_gray_coded = True
+
+# /////////////////////////////////////////////////////////////////////////////
+# QPSK constellation
+# /////////////////////////////////////////////////////////////////////////////
+
+def qpsk_constellation(m=_def_constellation_points):
+ if m != _def_constellation_points:
+ raise ValueError("QPSK can only have 4 constellation points.")
+ return gr.constellation_qpsk()
+
+# /////////////////////////////////////////////////////////////////////////////
+# QPSK modulator
+# /////////////////////////////////////////////////////////////////////////////
+
+class qpsk_mod(generic_mod):
+
+ def __init__(self, constellation_points=_def_constellation_points,
+ differential=_def_differential,
+ gray_coded=_def_gray_coded,
+ *args, **kwargs):
+
+ """
+ Hierarchical block for RRC-filtered QPSK modulation.
+
+ The input is a byte stream (unsigned char) and the
+ output is the complex modulated signal at baseband.
+
+ See generic_mod block for list of parameters.
+ """
+
+ constellation = gr.constellation_qpsk()
+ if constellation_points != 4:
+ raise ValueError("QPSK can only have 4 constellation points.")
+ if differential or not gray_coded:
+ raise ValueError("This QPSK mod/demod works only for gray-coded, non-differential.")
+ super(qpsk_mod, self).__init__(constellation, differential, gray_coded, *args, **kwargs)
+
+#
+# Add these to the mod/demod registry
+#
+modulation_utils2.add_type_1_mod('qpsk', qpsk_mod)
+modulation_utils2.add_type_1_constellation('qpsk', qpsk_constellation)
--
cgit v1.2.3