GNU Radio 3.6.2 C++ API
gr_decode_ccsds_27_fb.h
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/* -*- c++ -*- */
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/*
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* Copyright 2008 Free Software Foundation, Inc.
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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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#ifndef INCLUDED_GR_DECODE_CCSDS_27_FB_H
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#define INCLUDED_GR_DECODE_CCSDS_27_FB_H
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#include <
gr_core_api.h
>
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#include <
gr_sync_decimator.h
>
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extern
"C"
{
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#include <
viterbi.h
>
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}
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class
gr_decode_ccsds_27_fb
;
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typedef
boost::shared_ptr<gr_decode_ccsds_27_fb>
gr_decode_ccsds_27_fb_sptr
;
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GR_CORE_API
gr_decode_ccsds_27_fb_sptr
gr_make_decode_ccsds_27_fb
();
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/*! \brief A rate 1/2, k=7 convolutional decoder for the CCSDS standard
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* \ingroup ecc
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*
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* This block performs soft-decision convolutional decoding using the Viterbi
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* algorithm.
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*
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* The input is a stream of (possibly noise corrupted) floating point values
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* nominally spanning [-1.0, 1.0], representing the encoded channel symbols
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* 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.
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*
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* The output is MSB first packed bytes of decoded values.
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*
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* As a rate 1/2 code, there will be one output byte for every 16 input symbols.
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*
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* This block is designed for continuous data streaming, not packetized data.
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* The first 32 bits out will be zeroes, with the output delayed four bytes
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* from the corresponding inputs.
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*/
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class
GR_CORE_API
gr_decode_ccsds_27_fb
:
public
gr_sync_decimator
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{
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private
:
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friend
GR_CORE_API
gr_decode_ccsds_27_fb_sptr
gr_make_decode_ccsds_27_fb
();
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gr_decode_ccsds_27_fb
();
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// Viterbi state
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int
d_mettab[2][256];
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struct
viterbi_state
d_state0[64];
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struct
viterbi_state
d_state1[64];
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unsigned
char
d_viterbi_in[16];
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int
d_count;
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public
:
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~
gr_decode_ccsds_27_fb
();
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int
work
(
int
noutput_items,
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gr_vector_const_void_star
&input_items,
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gr_vector_void_star
&output_items);
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};
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#endif
/* INCLUDED_GR_DECODE_CCSDS_27_FB_H */
gnuradio-core
src
lib
general
gr_decode_ccsds_27_fb.h
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