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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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include <gnuradio/fec/polar_common.h>
#include <gnuradio/blocks/pack_k_bits.h>
#include <gnuradio/blocks/unpack_k_bits.h>
#include <cmath>
#include <stdexcept>
#include <iostream>
#include <vector>
namespace gr
{
namespace fec
{
polar_common::polar_common(int block_size, int num_info_bits,
std::vector<int> frozen_bit_positions,
std::vector<char> frozen_bit_values, bool is_packed) :
d_block_size(block_size), d_block_power((int) log2(float(block_size))), d_num_info_bits(num_info_bits), d_is_packed(is_packed),
d_frozen_bit_positions(frozen_bit_positions), d_frozen_bit_values(frozen_bit_values)
{
if(pow(2, d_block_power) != d_block_size) {
throw std::runtime_error("block_size MUST be a power of 2!");
}
unsigned int num_frozen_bits = d_block_size - d_num_info_bits;
if(num_frozen_bits != d_frozen_bit_positions.size()) {
throw std::runtime_error(
"number of frozen bit positions must equal block_size - num_info_bits");
}
// According to papers frozen bits default to '0'.
while(d_frozen_bit_values.size() < num_frozen_bits) {
d_frozen_bit_values.push_back(0);
}
initialize_info_bit_position_vector();
d_packer = new gr::blocks::kernel::pack_k_bits(8);
d_unpacker = new gr::blocks::kernel::unpack_k_bits(8);
}
std::vector<int>
polar_common::info_bit_position_vector()
{
return d_info_bit_positions;
}
void
polar_common::initialize_info_bit_position_vector()
{
int num_frozen_bit = 0;
int frozen_pos = d_frozen_bit_positions.at(num_frozen_bit);
for(int i = 0; i < block_size(); i++) {
if(i != frozen_pos) {
d_info_bit_positions.push_back((int) i);
}
else {
num_frozen_bit++;
num_frozen_bit = std::min(num_frozen_bit, (int) (d_frozen_bit_positions.size() - 1));
frozen_pos = d_frozen_bit_positions.at(num_frozen_bit);
}
}
if((int) d_info_bit_positions.size() != num_info_bits()) {
throw std::runtime_error("polar_common: number of info bit positions MUST equal num_info_bits (K)!");
}
}
polar_common::~polar_common()
{
delete d_packer;
delete d_unpacker;
}
long
polar_common::bit_reverse(long value, int active_bits) const
{
long r = 0;
for(int i = 0; i < active_bits; i++) {
r <<= 1;
r |= value & 1;
value >>= 1;
}
return r;
}
void
polar_common::print_packed_bit_array(const unsigned char* printed_array,
const int num_bytes) const
{
int num_bits = num_bytes << 3;
unsigned char* temp = new unsigned char[num_bits];
unpacker()->unpack(temp, printed_array, num_bytes);
std::cout << "[";
for(int i = 0; i < num_bits; i++) {
std::cout << (int) *(temp + i) << " ";
}
std::cout << "]" << std::endl;
delete [] temp;
}
void
polar_common::print_unpacked_bit_array(const unsigned char* bits,
const unsigned int num_bytes) const
{
std::cout << "( ";
for(unsigned int i = 0; i < num_bytes; i++){
std::cout << (int) *bits++ << ", ";
}
std::cout << ")" << std::endl;
}
} /* namespace fec */
} /* namespace gr */
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