decode_ccsds_27_fb.h

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/* -*- c++ -*- */
/*
 * Copyright 2012 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */
 
#ifndef INCLUDED_FEC_DECODE_CCSDS_27_FB_H
#define INCLUDED_FEC_DECODE_CCSDS_27_FB_H
 
#include <gnuradio/fec/api.h>
#include <gnuradio/sync_decimator.h>
 
namespace gr {
namespace fec {
 
/*! \brief A rate 1/2, k=7 convolutional decoder for the CCSDS standard
 * \ingroup error_coding_blk
 *
 * \details
 * This block performs soft-decision convolutional decoding using the Viterbi
 * algorithm.
 *
 * The input is a stream of (possibly noise corrupted) floating point values
 * nominally spanning [-1.0, 1.0], representing the encoded channel symbols
 * 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.
 *
 * The output is MSB first packed bytes of decoded values.
 *
 * As a rate 1/2 code, there will be one output byte for every 16 input symbols.
 *
 * This block is designed for continuous data streaming, not packetized data.
 * The first 32 bits out will be zeroes, with the output delayed four bytes
 * from the corresponding inputs.
 */
 
class FEC_API decode_ccsds_27_fb : virtual public sync_decimator
{
public:
    // gr::fec::decode_ccsds_27_fb::sptr
    typedef std::shared_ptr<decode_ccsds_27_fb> sptr;
 
    static sptr make();
};
 
} /* namespace fec */
} /* namespace gr */
 
#endif /* INCLUDED_FEC_DECODE_CCSDS_27_FB_H */