mirror of
https://github.com/hb9fxq/gr-digitalhf
synced 2024-12-22 15:10:00 +00:00
115 lines
3 KiB
C++
115 lines
3 KiB
C++
/* -*- c++ -*- */
|
|
/*
|
|
* Copyright 2018 hcab14@mail.com.
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This software is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this software; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <boost/format.hpp>
|
|
|
|
#include <gnuradio/math.h>
|
|
#include <gnuradio/expj.h>
|
|
#include <gnuradio/io_signature.h>
|
|
#include <gnuradio/logger.h>
|
|
|
|
#include <volk/volk.h>
|
|
|
|
#include "viterbi39_impl.h"
|
|
|
|
namespace gr {
|
|
namespace digitalhf {
|
|
|
|
viterbi39::sptr
|
|
viterbi39::make(std::uint32_t pol0,
|
|
std::uint32_t pol1,
|
|
std::uint32_t pol2)
|
|
{
|
|
return sptr(new viterbi39_impl(pol0, pol1, pol2));
|
|
}
|
|
|
|
viterbi39_impl::viterbi39_impl(std::uint32_t pol0,
|
|
std::uint32_t pol1,
|
|
std::uint32_t pol2)
|
|
: _v({pol0, pol1, pol2})
|
|
, _quality(0)
|
|
, _num_bits(0)
|
|
, _bits()
|
|
{
|
|
}
|
|
|
|
viterbi39_impl::~viterbi39_impl()
|
|
{
|
|
}
|
|
|
|
void viterbi39_impl::reset() {
|
|
_v.reset();
|
|
_quality = 0;
|
|
}
|
|
|
|
|
|
const std::vector<std::uint8_t>& viterbi39_impl::udpate(const std::vector<float>& soft_dec) {
|
|
size_t symb_len = soft_dec.size();
|
|
float const *sd = &soft_dec[0];
|
|
|
|
size_t const num_bits = symb_len/3;
|
|
_bits.resize(num_bits);
|
|
std::vector<uint8_t>::iterator iterator_bits = _bits.begin();
|
|
|
|
size_t bits_per_frame = 5*9; // 5 times constraint length
|
|
_v.resize(bits_per_frame);
|
|
|
|
size_t num_frames = num_bits/bits_per_frame;
|
|
|
|
_quality = 0;
|
|
int i = 0;
|
|
for (; i<num_frames; ++i) {
|
|
for (int j=0; j<bits_per_frame; ++j) {
|
|
std::array<std::uint8_t, 3> const symb = {
|
|
table_lookup(sd[3*(i*bits_per_frame+j) ]),
|
|
table_lookup(sd[3*(i*bits_per_frame+j)+1]),
|
|
table_lookup(sd[3*(i*bits_per_frame+j)+2])
|
|
};
|
|
_v.update(j, symb);
|
|
}
|
|
_quality += _v.chainback(iterator_bits, iterator_bits+bits_per_frame);
|
|
iterator_bits += bits_per_frame;
|
|
}
|
|
|
|
size_t remaining_bits = num_bits - bits_per_frame*num_frames;
|
|
_v.resize(remaining_bits);
|
|
for (int j=0; j<remaining_bits; ++j) {
|
|
std::array<std::uint8_t, 3> const symb = {
|
|
table_lookup(sd[3*(i*bits_per_frame+j) ]),
|
|
table_lookup(sd[3*(i*bits_per_frame+j)+1]),
|
|
table_lookup(sd[3*(i*bits_per_frame+j)+2])
|
|
};
|
|
_v.update(j, symb);
|
|
}
|
|
_quality += _v.chainback(iterator_bits, iterator_bits+remaining_bits);
|
|
return _bits;
|
|
}
|
|
|
|
float viterbi39_impl::quality() {
|
|
return _quality;
|
|
}
|
|
|
|
} // namespace digitalhf
|
|
} // namespace gr
|