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[Commit-gnuradio] r4066 - gnuradio/branches/developers/jcorgan/hier/gnur
From: |
jcorgan |
Subject: |
[Commit-gnuradio] r4066 - gnuradio/branches/developers/jcorgan/hier/gnuradio-core/src/python/gnuradio/blksimpl |
Date: |
Tue, 12 Dec 2006 00:12:05 -0700 (MST) |
Author: jcorgan
Date: 2006-12-12 00:12:05 -0700 (Tue, 12 Dec 2006)
New Revision: 4066
Modified:
gnuradio/branches/developers/jcorgan/hier/gnuradio-core/src/python/gnuradio/blksimpl/dqpsk.py
Log:
Revert file to trunk copy.
Modified:
gnuradio/branches/developers/jcorgan/hier/gnuradio-core/src/python/gnuradio/blksimpl/dqpsk.py
===================================================================
---
gnuradio/branches/developers/jcorgan/hier/gnuradio-core/src/python/gnuradio/blksimpl/dqpsk.py
2006-12-12 07:00:49 UTC (rev 4065)
+++
gnuradio/branches/developers/jcorgan/hier/gnuradio-core/src/python/gnuradio/blksimpl/dqpsk.py
2006-12-12 07:12:05 UTC (rev 4066)
@@ -239,13 +239,13 @@
# Costas loop (carrier tracking)
if self._costas_alpha is None: # If no alpha value was specified by
the user
- alpha_dir = {2:0.075, 3:0.075, 4:0.105, 5:0.105, 6:0.125, 7:0.130}
+ alpha_dir = {2:0.075, 3:0.09, 4:0.09, 5:0.095, 6:0.10, 7:0.105}
self._costas_alpha = alpha_dir[self._samples_per_symbol]
costas_order = 4
- # The value of beta is now set to be overdamped; this value can have a
huge impact on the
+ # The value of beta is now set to be underdamped; this value can have
a huge impact on the
# performance of QPSK. Set to 0.25 for critically damped or higher for
underdamped responses.
- beta = .15 * self._costas_alpha * self._costas_alpha
+ beta = .35 * self._costas_alpha * self._costas_alpha
self.costas_loop = gr.costas_loop_cc(self._costas_alpha, beta, 0.02,
-0.02, costas_order)
# RRC data filter
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