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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
*
*/
#ifndef INCLUDED_FEC_POLAR_DECODER_SC_H
#define INCLUDED_FEC_POLAR_DECODER_SC_H
#include <gnuradio/fec/api.h>
#include <gnuradio/fec/polar_decoder_common.h>
namespace gr {
namespace fec {
namespace code {
/*!
* \brief Standard successive cancellation (SC) decoder for POLAR codes
*
* \details
* It expects float input with bits mapped 1 --> 1, 0 --> -1
* Or: f = 2.0 * bit - 1.0
*
*/
class FEC_API polar_decoder_sc : public polar_decoder_common
{
public:
/*!
* \param block_size codeword size. MUST be a power of 2.
* \param num_info_bits represents the number of information
* bits in a block. Also called frame_size. <= block_size
* \param frozen_bit_positions is an integer vector which
* defines the position of all frozen bits in a block.
* Its size MUST be equal to block_size - num_info_bits.
* Also it must be sorted and every position must only
* occur once.
* \param frozen_bit_values holds an unpacked byte for every
* frozen bit position. It defines if a frozen bit is
* fixed to '0' or '1'. Defaults to all ZERO.
*/
static generic_decoder::sptr make(int block_size,
int num_info_bits,
std::vector<int> frozen_bit_positions,
std::vector<char> frozen_bit_values);
~polar_decoder_sc();
// FECAPI
void generic_work(void* in_buffer, void* out_buffer);
private:
polar_decoder_sc(int block_size,
int num_info_bits,
std::vector<int> frozen_bit_positions,
std::vector<char> frozen_bit_values);
float* d_llr_vec;
unsigned char* d_u_hat_vec;
unsigned char retrieve_bit_from_llr(float llr, const int pos);
void sc_decode(float* llrs, unsigned char* u);
};
} // namespace code
} // namespace fec
} // namespace gr
#endif /* INCLUDED_FEC_POLAR_DECODER_SC_H */
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