11 Apr
2017
11 Apr
'17
2:36 a.m.
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http://cgit.osmocom.org/libosmocore/commit/?id=35536807ab9a4265c6eb9ec62793…
commit 35536807ab9a4265c6eb9ec62793d0c06b9b662b
Author: Tom Tsou <tom.tsou(a)ettus.com>
Date: Thu Nov 24 19:24:32 2016 +0700
core/conv: implement optimized Viterbi decoder
Add a separate, faster convolution decoding implementation for rates
up to N=4 and constraint lengths of K=5 and K=7, which covers the
most GSM code uses. The decoding algorithm exploits the symmetric
structure of the Viterbi add-compare-select (ACS) operation - commonly
known as the ACS butterfly. This shift-register optimization can be
found in the well-known text by Dave Forney.
Forney, G.D., "The Viterbi Algorithm," Proc. of the IEEE, March 1973.
Implementation is non-architecture specific and improves performance on
x86 as well as ARM processors. Existing API is unchanged with optimized
code being called internally for supported codes.
The original code was relicensed under GPLv2-or-later with permission
of copyright holder - Tom Tsou.
Change-Id: I74d355274b4176a7d924f91ef3c96912ce338fb2
-----------------------------------------------------------------------
Summary of changes:
src/Makefile.am | 3 +-
src/conv.c | 9 +
src/viterbi.c | 602 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/viterbi_gen.c | 193 +++++++++++++++++
4 files changed, 806 insertions(+), 1 deletion(-)
create mode 100644 src/viterbi.c
create mode 100644 src/viterbi_gen.c
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An utility library for Open Source Mobile Communications