Forgot to add qpsk.py in last commit.

1 files changed, 79 insertions, 0 deletions

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 000000000..f62ae232c
--- /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)