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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_FEC_POLAR_ENCODER_SYSTEMATIC_H
#define INCLUDED_FEC_POLAR_ENCODER_SYSTEMATIC_H
#include <gnuradio/fec/api.h>
#include <gnuradio/fec/generic_encoder.h>
#include <gnuradio/fec/polar_common.h>
namespace gr {
namespace fec {
namespace code {
/*!
* \brief systematic POLAR encoder
* for basic details see 'polar_common' class.
* \ingroup error_coding_blk
*
* \details
* expects values with MSB first. It needs a full information word and encodes it in one
* pass. Output is a codeword of block_size.
*
* Systematic encoding indicates that the info bit values are present in the codeword.
* 'info_bit_positions' may be obtained by ordering all non frozen_bit_positions in
* increasing order. One may extract them at their positions after a bit reversal
* operation. encoder -> decoder chain would need additional bit-reversal after encoding +
* before decoding. This is unnecessary.
*/
class FEC_API polar_encoder_systematic : public generic_encoder, public polar_common
{
public:
/*!
* Factory for a polar code encoder object.
*
* \param block_size defines the codeword size. It MUST be a
* power of 2.
* \param num_info_bits represents the number of information
* bits in a block. Also called frame_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. Frozen bit values will be set to ZERO!
*/
static generic_encoder::sptr
make(int block_size, int num_info_bits, std::vector<int> frozen_bit_positions);
// FECAPI
void generic_work(void* in_buffer, void* out_buffer);
double rate() { return (1.0 * get_input_size() / get_output_size()); };
int get_input_size() { return num_info_bits(); };
int get_output_size() { return block_size(); };
bool set_frame_size(unsigned int frame_size) { return false; };
~polar_encoder_systematic();
private:
polar_encoder_systematic(int block_size,
int num_info_bits,
std::vector<int> frozen_bit_positions);
void bit_reverse_and_reset_frozen_bits(unsigned char* outbuf,
const unsigned char* inbuf);
unsigned char* d_volk_syst_intermediate;
};
} // namespace code
} // namespace fec
} // namespace gr
#endif /* INCLUDED_FEC_POLAR_ENCODER_SYSTEMATIC_H */
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