From 5784b0c53c6d19b7a74f82e57c816beecd8b5edb Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Mon, 29 Aug 2011 17:58:25 -0400
Subject: digital: fixing qa code to test new dqpsk; a few minor formatting
changes.
---
gr-digital/lib/digital_constellation.cc | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
(limited to 'gr-digital/lib/digital_constellation.cc')
diff --git a/gr-digital/lib/digital_constellation.cc b/gr-digital/lib/digital_constellation.cc
index ed6d32bcb0..3dfc70273d 100644
--- a/gr-digital/lib/digital_constellation.cc
+++ b/gr-digital/lib/digital_constellation.cc
@@ -463,12 +463,16 @@ digital_make_constellation_dqpsk()
digital_constellation_dqpsk::digital_constellation_dqpsk ()
{
+ // This constellation is not gray coded, which allows
+ // us to use differential encodings (through gr_diff_encode and
+ // gr_diff_decode) on the symbols.
d_constellation.resize(4);
d_constellation[0] = gr_complex(+SQRT_TWO, +SQRT_TWO);
d_constellation[1] = gr_complex(-SQRT_TWO, +SQRT_TWO);
d_constellation[2] = gr_complex(-SQRT_TWO, -SQRT_TWO);
d_constellation[3] = gr_complex(+SQRT_TWO, -SQRT_TWO);
+ // Use this mapping to convert to gray code before diff enc.
d_pre_diff_code.resize(4);
d_pre_diff_code[0] = 0x0;
d_pre_diff_code[1] = 0x1;
@@ -481,10 +485,12 @@ digital_constellation_dqpsk::digital_constellation_dqpsk ()
calc_arity();
}
-#include <cstdio>
unsigned int
digital_constellation_dqpsk::decision_maker(const gr_complex *sample)
{
+ // Slower deicison maker as we can't slice along one axis.
+ // Maybe there's a better way to do this, still.
+
bool a = real(*sample) > 0;
bool b = imag(*sample) > 0;
if(a) {
--
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