GNU Radio 3.7.0-50 C++ API
viterbi.h
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/*
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* Copyright 2008 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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/* The path memory for each state is 32 bits. This is slightly shorter
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* than we'd like for K=7, especially since we chain back every 8 bits.
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* But it fits so nicely into a 32-bit machine word...
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*/
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#include <
gnuradio/fec/api.h
>
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struct
viterbi_state
{
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unsigned
long
path
;
/* Decoded path to this state */
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long
metric
;
/* Cumulative metric to this state */
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};
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FEC_API
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int
gen_met
(
int
mettab[2][256],
/* Metric table */
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int
amp,
/* Signal amplitude */
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double
esn0,
/* Es/N0 ratio in dB */
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double
bias,
/* Metric bias */
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int
scale);
/* Scale factor */
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FEC_API
unsigned
char
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encode
(
unsigned
char
*symbols,
unsigned
char
*data,
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unsigned
int
nbytes,
unsigned
char
encstate);
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FEC_API
void
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viterbi_chunks_init
(
struct
viterbi_state
* state);
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FEC_API
void
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viterbi_butterfly2
(
unsigned
char
*symbols,
int
mettab[2][256],
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struct
viterbi_state
*state0,
struct
viterbi_state
*state1);
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FEC_API
unsigned
char
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viterbi_get_output
(
struct
viterbi_state
*state,
unsigned
char
*outbuf);
gnuradio
gr-fec
include
gnuradio
fec
viterbi.h
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