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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "scl_list.h"
#include <gnuradio/fec/polar_decoder_sc_list.h>
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
#include <algorithm>
#include <cmath>
namespace gr {
namespace fec {
namespace code {
generic_decoder::sptr polar_decoder_sc_list::make(int max_list_size,
int block_size,
int num_info_bits,
std::vector<int> frozen_bit_positions,
std::vector<uint8_t> frozen_bit_values)
{
return generic_decoder::sptr(new polar_decoder_sc_list(max_list_size,
block_size,
num_info_bits,
frozen_bit_positions,
frozen_bit_values));
}
polar_decoder_sc_list::polar_decoder_sc_list(int max_list_size,
int block_size,
int num_info_bits,
std::vector<int> frozen_bit_positions,
std::vector<uint8_t> frozen_bit_values)
: polar_decoder_common(
block_size, num_info_bits, frozen_bit_positions, frozen_bit_values)
{
d_scl = new polar::scl_list(max_list_size, block_size, block_power());
}
polar_decoder_sc_list::~polar_decoder_sc_list() { delete d_scl; }
void polar_decoder_sc_list::generic_work(void* in_buffer, void* out_buffer)
{
const float* in = (const float*)in_buffer;
unsigned char* out = (unsigned char*)out_buffer;
initialize_list(in);
const unsigned char* temp = decode_list();
extract_info_bits(out, temp);
}
void polar_decoder_sc_list::initialize_list(const float* in_buf)
{
polar::path* init_path = d_scl->initial_path();
initialize_decoder(init_path->u_vec, init_path->llr_vec, in_buf);
}
const unsigned char* polar_decoder_sc_list::decode_list()
{
for (int u_num = 0; u_num < block_size(); u_num++) {
decode_bit(u_num);
}
return d_scl->optimal_path()->u_vec;
}
void polar_decoder_sc_list::decode_bit(const int u_num)
{
calculate_llrs_for_list(u_num);
set_bit_in_list(u_num);
}
void polar_decoder_sc_list::calculate_llrs_for_list(const int u_num)
{
for (unsigned int i = 0; i < d_scl->active_size(); i++) {
polar::path* current_path = d_scl->next_active_path();
butterfly(current_path->llr_vec, current_path->u_vec, 0, u_num, u_num);
}
}
void polar_decoder_sc_list::set_bit_in_list(const int u_num)
{
// 1. if frozen bit, update with known value
if (is_frozen_bit(u_num)) {
const unsigned char frozen_bit = next_frozen_bit();
d_scl->set_frozen_bit(frozen_bit, u_num);
}
// 2. info bit
else {
d_scl->set_info_bit(u_num);
}
}
} /* namespace code */
} /* namespace fec */
} /* namespace gr */
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