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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_COMMON_H
#define INCLUDED_FEC_POLAR_COMMON_H
#include <gnuradio/fec/api.h>
// Forward declaration for those objects. SWIG doesn't like them to be #include'd.
namespace gr {
namespace blocks {
namespace kernel {
class unpack_k_bits;
}
}
}
namespace gr {
namespace fec {
/*!
* \brief POLAR code common operations and attributes
* Erdal Arikan "Channel Polarization: A Method for Contructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels", 2009
* \ingroup error_coding_blk
*
* \details
* polar codes are based on this paper by Erdal Arikan
* "Channel Polarization: A Method for Contructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels", 2009
*
* class holds common info. It is common to all encoders and decoders.
* block_size: MUST be a power of 2.
* num_info_bits: any integer <= block_size
* frozen_bit_positions: elements specify position of frozen bits in each frame. size MUST be equal to block_size - num_info_bits
* frozen_bit_values: desired frozen bit values. '0' appended if smaller than frozen_bit_positions.
*/
class FEC_API polar_common
{
public:
polar_common(int block_size, int num_info_bits, std::vector<int> frozen_bit_positions, std::vector<char> frozen_bit_values);
~polar_common();
protected:
const int block_size()const {return d_block_size;};
const int block_power()const {return d_block_power;};
const int num_info_bits() const {return d_num_info_bits;};
// helper functions
long bit_reverse(long value, int active_bits) const;
void print_packed_bit_array(const unsigned char* printed_array, const int num_bytes) const;
void print_unpacked_bit_array(const unsigned char* bits, const unsigned int num_bytes) const;
std::vector<int> d_frozen_bit_positions;
std::vector<char> d_frozen_bit_values;
std::vector<int> d_info_bit_positions;
private:
int d_block_size; // depending on paper called 'N' or 'm'
int d_block_power;
int d_num_info_bits; // mostly abbreviated by 'K'
void initialize_info_bit_position_vector();
gr::blocks::kernel::unpack_k_bits *d_unpacker; // convenience for 'print_packed_bit_array' function.
};
} // namespace fec
} // namespace gr
#endif /* INCLUDED_FEC_POLAR_COMMON_H */
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