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fec.cpp
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fec.cpp
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// This program 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 as version 3 of the License, or //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string.h>
#include "fec.h"
namespace DSDcc
{
const unsigned char Hamming_7_4::m_G[7*4] = {
1, 0, 0, 0, 1, 0, 1,
0, 1, 0, 0, 1, 1, 1,
0, 0, 1, 0, 1, 1, 0,
0, 0, 0, 1, 0, 1, 1,
};
const unsigned char Hamming_7_4::m_H[7*3] = {
1, 1, 1, 0, 1, 0, 0,
0, 1, 1, 1, 0, 1, 0,
1, 1, 0, 1, 0, 0, 1
// 0 1 2 3 <- correctable bit positions
};
// ========================================================================================
const unsigned char Hamming_12_8::m_G[12*8] = {
1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0,
0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1,
0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1,
0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1,
};
const unsigned char Hamming_12_8::m_H[12*4] = {
1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0,
1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0,
1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0,
0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1
// 0 1 2 3 4 5 6 7 <- correctable bit positions
};
// ========================================================================================
const unsigned char Hamming_15_11::m_G[15*11] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1,
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1,
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1,
};
const unsigned char Hamming_15_11::m_H[15*4] = {
1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0,
0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0,
1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1,
// 0 1 2 3 4 5 6 7 8 9 10 <- correctable bit positions
};
// ========================================================================================
const unsigned char Hamming_16_11_4::m_G[16*11] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1,
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0,
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1,
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1
};
const unsigned char Hamming_16_11_4::m_H[16*5] = {
1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0,
0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0,
1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0,
1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1
};
// ========================================================================================
const unsigned char Golay_20_8::m_G[20*8] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0,
0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1,
0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1,
0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0,
0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1,
0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1,
};
const unsigned char Golay_20_8::m_H[20*12] = {
0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,
0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
};
// ========================================================================================
const unsigned char Golay_23_12::m_G[23*12] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0,
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1,
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0,
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1,
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1,
};
const unsigned char Golay_23_12::m_H[23*11] = {
1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,
0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
};
// ========================================================================================
const unsigned char Golay_24_12::m_G[24*12] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1,
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1,
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0,
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1,
};
const unsigned char Golay_24_12::m_H[24*12] = {
1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,
1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
};
// ========================================================================================
const unsigned char QR_16_7_6::m_G[16*7] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1,
0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1,
0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0,
0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1,
0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1,
};
const unsigned char QR_16_7_6::m_H[16*9] = {
0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0,
0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0,
1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1,
};
// ========================================================================================
Hamming_7_4::Hamming_7_4()
{
init();
}
Hamming_7_4::~Hamming_7_4()
{
}
void Hamming_7_4::init()
{
// correctable bit positions given syndrome bits as index (see above)
memset(m_corr, 0xFF, 8); // initialize with all invalid positions
m_corr[0b101] = 0;
m_corr[0b111] = 1;
m_corr[0b110] = 2;
m_corr[0b011] = 3;
m_corr[0b100] = 4;
m_corr[0b010] = 5;
m_corr[0b001] = 6;
}
// Not very efficient but encode is used for unit testing only
void Hamming_7_4::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 7);
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 7; j++)
{
encodedBits[j] += origBits[i] * m_G[7*i + j];
}
}
for (int i = 0; i < 7; i++)
{
encodedBits[i] %= 2;
}
}
bool Hamming_7_4::decode(unsigned char *rxBits) // corrects in place
{
unsigned int syndromeI = 0; // syndrome index
for (int is = 0; is < 3; is++)
{
syndromeI += (((rxBits[0] * m_H[7*is + 0])
+ (rxBits[1] * m_H[7*is + 1])
+ (rxBits[2] * m_H[7*is + 2])
+ (rxBits[3] * m_H[7*is + 3])
+ (rxBits[4] * m_H[7*is + 4])
+ (rxBits[5] * m_H[7*is + 5])
+ (rxBits[6] * m_H[7*is + 6])) % 2) << (2-is);
}
if (syndromeI > 0)
{
if (m_corr[syndromeI] == 0xFF)
{
return false;
}
else
{
rxBits[m_corr[syndromeI]] ^= 1; // flip bit
}
}
return true;
}
// ========================================================================================
Hamming_12_8::Hamming_12_8()
{
init();
}
Hamming_12_8::~Hamming_12_8()
{
}
void Hamming_12_8::init()
{
// correctable bit positions given syndrome bits as index (see above)
memset(m_corr, 0xFF, 16); // initialize with all invalid positions
m_corr[0b1110] = 0;
m_corr[0b0111] = 1;
m_corr[0b1010] = 2;
m_corr[0b0101] = 3;
m_corr[0b1011] = 4;
m_corr[0b1100] = 5;
m_corr[0b0110] = 6;
m_corr[0b0011] = 7;
m_corr[0b1000] = 8;
m_corr[0b0100] = 9;
m_corr[0b0010] = 10;
m_corr[0b0001] = 11;
}
// Not very efficient but encode is used for unit testing only
void Hamming_12_8::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 12);
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 12; j++)
{
encodedBits[j] += origBits[i] * m_G[12*i + j];
}
}
for (int i = 0; i < 12; i++)
{
encodedBits[i] %= 2;
}
}
bool Hamming_12_8::decode(unsigned char *rxBits, unsigned char *decodedBits, int nbCodewords)
{
bool correctable = true;
for (int ic = 0; ic < nbCodewords; ic++)
{
// calculate syndrome
int syndromeI = 0; // syndrome index
for (int is = 0; is < 4; is++)
{
syndromeI += (((rxBits[12*ic + 0] * m_H[12*is + 0])
+ (rxBits[12*ic + 1] * m_H[12*is + 1])
+ (rxBits[12*ic + 2] * m_H[12*is + 2])
+ (rxBits[12*ic + 3] * m_H[12*is + 3])
+ (rxBits[12*ic + 4] * m_H[12*is + 4])
+ (rxBits[12*ic + 5] * m_H[12*is + 5])
+ (rxBits[12*ic + 6] * m_H[12*is + 6])
+ (rxBits[12*ic + 7] * m_H[12*is + 7])
+ (rxBits[12*ic + 8] * m_H[12*is + 8])
+ (rxBits[12*ic + 9] * m_H[12*is + 9])
+ (rxBits[12*ic + 10] * m_H[12*is + 10])
+ (rxBits[12*ic + 11] * m_H[12*is + 11])) % 2) << (3-is);
}
// correct bit
if (syndromeI > 0) // single bit error correction
{
if (m_corr[syndromeI] == 0xFF) // uncorrectable error
{
correctable = false;
}
else
{
rxBits[m_corr[syndromeI]] ^= 1; // flip bit
}
}
// move information bits
memcpy(&decodedBits[8*ic], &rxBits[12*ic], 8);
}
return correctable;
}
// ========================================================================================
Hamming_16_11_4::Hamming_16_11_4()
{
init();
}
Hamming_16_11_4::~Hamming_16_11_4()
{
}
void Hamming_16_11_4::init()
{
// correctable bit positions given syndrome bits as index (see above)
memset(m_corr, 0xFF, 32); // initialize with all invalid positions
m_corr[0b10011] = 0;
m_corr[0b11010] = 1;
m_corr[0b11111] = 2;
m_corr[0b11100] = 3;
m_corr[0b01110] = 4;
m_corr[0b10101] = 5;
m_corr[0b01011] = 6;
m_corr[0b10110] = 7;
m_corr[0b11001] = 8;
m_corr[0b01101] = 9;
m_corr[0b00111] = 10;
m_corr[0b10000] = 11;
m_corr[0b01000] = 12;
m_corr[0b00100] = 13;
m_corr[0b00010] = 14;
m_corr[0b00001] = 15;
}
// Not very efficient but encode is used for unit testing only
void Hamming_16_11_4::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 16);
for (int i = 0; i < 11; i++)
{
for (int j = 0; j < 16; j++)
{
encodedBits[j] += origBits[i] * m_G[16*i + j];
}
}
for (int i = 0; i < 16; i++)
{
encodedBits[i] %= 2;
}
}
bool Hamming_16_11_4::decode(unsigned char *rxBits, unsigned char *decodedBits, int nbCodewords)
{
bool correctable = true;
for (int ic = 0; ic < nbCodewords; ic++)
{
// calculate syndrome
int syndromeI = 0; // syndrome index
for (int is = 0; is < 5; is++)
{
syndromeI += (((rxBits[16*ic + 0] * m_H[16*is + 0])
+ (rxBits[16*ic + 1] * m_H[16*is + 1])
+ (rxBits[16*ic + 2] * m_H[16*is + 2])
+ (rxBits[16*ic + 3] * m_H[16*is + 3])
+ (rxBits[16*ic + 4] * m_H[16*is + 4])
+ (rxBits[16*ic + 5] * m_H[16*is + 5])
+ (rxBits[16*ic + 6] * m_H[16*is + 6])
+ (rxBits[16*ic + 7] * m_H[16*is + 7])
+ (rxBits[16*ic + 8] * m_H[16*is + 8])
+ (rxBits[16*ic + 9] * m_H[16*is + 9])
+ (rxBits[16*ic + 10] * m_H[16*is + 10])
+ (rxBits[16*ic + 11] * m_H[16*is + 11])
+ (rxBits[16*ic + 12] * m_H[16*is + 12])
+ (rxBits[16*ic + 13] * m_H[16*is + 13])
+ (rxBits[16*ic + 14] * m_H[16*is + 14])
+ (rxBits[16*ic + 15] * m_H[16*is + 15])) % 2) << (4-is);
}
// correct bit
if (syndromeI > 0) // single bit error correction
{
if (m_corr[syndromeI] == 0xFF) // uncorrectable error
{
correctable = false;
break;
}
else
{
rxBits[m_corr[syndromeI]] ^= 1; // flip bit
}
}
// move information bits
if (decodedBits)
{
memcpy(&decodedBits[11*ic], &rxBits[16*ic], 11);
}
}
return correctable;
}
// ========================================================================================
Hamming_15_11::Hamming_15_11()
{
init();
}
Hamming_15_11::~Hamming_15_11()
{
}
void Hamming_15_11::init()
{
// correctable bit positions given syndrome bits as index (see above)
memset(m_corr, 0xFF, 16); // initialize with all invalid positions
m_corr[0b1001] = 0;
m_corr[0b1101] = 1;
m_corr[0b1111] = 2;
m_corr[0b1110] = 3;
m_corr[0b0111] = 4;
m_corr[0b1010] = 5;
m_corr[0b0101] = 6;
m_corr[0b1011] = 7;
m_corr[0b1100] = 8;
m_corr[0b0110] = 9;
m_corr[0b0011] = 10;
m_corr[0b1000] = 11;
m_corr[0b0100] = 12;
m_corr[0b0010] = 13;
m_corr[0b0001] = 14;
}
// Not very efficient but encode is used for unit testing only
void Hamming_15_11::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 15);
for (int i = 0; i < 11; i++)
{
for (int j = 0; j < 15; j++)
{
encodedBits[j] += origBits[i] * m_G[15*i + j];
}
}
for (int i = 0; i < 15; i++)
{
encodedBits[i] %= 2;
}
}
bool Hamming_15_11::decode(unsigned char *rxBits, unsigned char *decodedBits, int nbCodewords)
{
bool correctable = true;
for (int ic = 0; ic < nbCodewords; ic++)
{
// calculate syndrome
int syndromeI = 0; // syndrome index
for (int is = 0; is < 4; is++)
{
syndromeI += (((rxBits[15*ic + 0] * m_H[15*is + 0])
+ (rxBits[15*ic + 1] * m_H[15*is + 1])
+ (rxBits[15*ic + 2] * m_H[15*is + 2])
+ (rxBits[15*ic + 3] * m_H[15*is + 3])
+ (rxBits[15*ic + 4] * m_H[15*is + 4])
+ (rxBits[15*ic + 5] * m_H[15*is + 5])
+ (rxBits[15*ic + 6] * m_H[15*is + 6])
+ (rxBits[15*ic + 7] * m_H[15*is + 7])
+ (rxBits[15*ic + 8] * m_H[15*is + 8])
+ (rxBits[15*ic + 9] * m_H[15*is + 9])
+ (rxBits[15*ic + 10] * m_H[15*is + 10])
+ (rxBits[15*ic + 11] * m_H[15*is + 11])
+ (rxBits[15*ic + 12] * m_H[15*is + 12])
+ (rxBits[15*ic + 13] * m_H[15*is + 13])
+ (rxBits[15*ic + 14] * m_H[15*is + 14])) % 2) << (3-is);
}
// correct bit
if (syndromeI > 0) // single bit error correction
{
if (m_corr[syndromeI] == 0xFF) // uncorrectable error
{
correctable = false;
break;
}
else
{
rxBits[m_corr[syndromeI]] ^= 1; // flip bit
}
}
// move information bits
if (decodedBits)
{
memcpy(&decodedBits[11*ic], &rxBits[15*ic], 11);
}
}
return correctable;
}
// ========================================================================================
Golay_20_8::Golay_20_8()
{
init();
}
Golay_20_8::~Golay_20_8()
{
}
void Golay_20_8::init()
{
memset (m_corr, 0xFF, 3*4096);
for (int i1 = 0; i1 < 8; i1++)
{
for (int i2 = i1+1; i2 < 8; i2++)
{
for (int i3 = i2+1; i3 < 8; i3++)
{
// 3 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 12; ir++)
{
syndromeI += ((m_H[20*ir + i1] + m_H[20*ir + i2] + m_H[20*ir + i3]) % 2) << (11-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
m_corr[syndromeI][2] = i3;
}
// 2 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 12; ir++)
{
syndromeI += ((m_H[20*ir + i1] + m_H[20*ir + i2]) % 2) << (11-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
// 1 possible bit flip left in the parity part
for (int ip = 0; ip < 12; ip++)
{
int syndromeIP = syndromeI ^ (1 << (11-ip));
m_corr[syndromeIP][0] = i1;
m_corr[syndromeIP][1] = i2;
m_corr[syndromeIP][2] = 8 + ip;
}
}
// single bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 12; ir++)
{
syndromeI += m_H[20*ir + i1] << (11-ir);
}
m_corr[syndromeI][0] = i1;
for (int ip1 = 0; ip1 < 12; ip1++) // 1 more bit flip in parity
{
int syndromeIP1 = syndromeI ^ (1 << (11-ip1));
m_corr[syndromeIP1][0] = i1;
m_corr[syndromeIP1][1] = 8 + ip1;
for (int ip2 = ip1+1; ip2 < 12; ip2++) // 1 more bit flip in parity
{
int syndromeIP2 = syndromeIP1 ^ (1 << (11-ip2));
m_corr[syndromeIP2][0] = i1;
m_corr[syndromeIP2][1] = 8 + ip1;
m_corr[syndromeIP2][2] = 8 + ip2;
}
}
}
// no bit patterns (in message) -> all in parity
for (int ip1 = 0; ip1 < 12; ip1++) // 1 bit flip in parity
{
int syndromeIP1 = (1 << (11-ip1));
m_corr[syndromeIP1][0] = 8 + ip1;
for (int ip2 = ip1+1; ip2 < 12; ip2++) // 1 more bit flip in parity
{
int syndromeIP2 = syndromeIP1 ^ (1 << (11-ip2));
m_corr[syndromeIP2][0] = 8 + ip1;
m_corr[syndromeIP2][1] = 8 + ip2;
for (int ip3 = ip2+1; ip3 < 12; ip3++) // 1 more bit flip in parity
{
int syndromeIP3 = syndromeIP2 ^ (1 << (11-ip3));
m_corr[syndromeIP3][0] = 8 + ip1;
m_corr[syndromeIP3][1] = 8 + ip2;
m_corr[syndromeIP3][2] = 8 + ip3;
}
}
}
}
// Not very efficient but encode is used for unit testing only
void Golay_20_8::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 20);
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 20; j++)
{
encodedBits[j] += origBits[i] * m_G[20*i + j];
}
}
for (int i = 0; i < 20; i++)
{
encodedBits[i] %= 2;
}
}
bool Golay_20_8::decode(unsigned char *rxBits)
{
unsigned int syndromeI = 0; // syndrome index
for (int is = 0; is < 12; is++)
{
syndromeI += (((rxBits[0] * m_H[20*is + 0])
+ (rxBits[1] * m_H[20*is + 1])
+ (rxBits[2] * m_H[20*is + 2])
+ (rxBits[3] * m_H[20*is + 3])
+ (rxBits[4] * m_H[20*is + 4])
+ (rxBits[5] * m_H[20*is + 5])
+ (rxBits[6] * m_H[20*is + 6])
+ (rxBits[7] * m_H[20*is + 7])
+ (rxBits[8] * m_H[20*is + 8])
+ (rxBits[9] * m_H[20*is + 9])
+ (rxBits[10] * m_H[20*is + 10])
+ (rxBits[11] * m_H[20*is + 11])
+ (rxBits[12] * m_H[20*is + 12])
+ (rxBits[13] * m_H[20*is + 13])
+ (rxBits[14] * m_H[20*is + 14])
+ (rxBits[15] * m_H[20*is + 15])
+ (rxBits[16] * m_H[20*is + 16])
+ (rxBits[17] * m_H[20*is + 17])
+ (rxBits[18] * m_H[20*is + 18])
+ (rxBits[19] * m_H[20*is + 19])) % 2) << (11-is);
}
if (syndromeI > 0)
{
int i = 0;
for (; i < 3; i++)
{
if (m_corr[syndromeI][i] == 0xFF)
{
break;
}
else
{
rxBits[m_corr[syndromeI][i]] ^= 1; // flip bit
}
}
if (i == 0)
{
return false;
}
}
return true;
}
// ========================================================================================
Golay_23_12::Golay_23_12()
{
init();
}
Golay_23_12::~Golay_23_12()
{
}
void Golay_23_12::init()
{
memset (m_corr, 0xFF, 3*2048);
for (int i1 = 0; i1 < 12; i1++)
{
for (int i2 = i1+1; i2 < 12; i2++)
{
for (int i3 = i2+1; i3 < 12; i3++)
{
// 3 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 11; ir++) {
syndromeI += ((m_H[23*ir + i1] + m_H[23*ir + i2] + m_H[23*ir + i3]) % 2) << (10-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
m_corr[syndromeI][2] = i3;
}
// 2 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 11; ir++) {
syndromeI += ((m_H[23*ir + i1] + m_H[23*ir + i2]) % 2) << (10-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
// 1 possible bit flip left in the parity part
for (int ip = 0; ip < 11; ip++)
{
int syndromeIP = syndromeI ^ (1 << (10-ip));
m_corr[syndromeIP][0] = i1;
m_corr[syndromeIP][1] = i2;
m_corr[syndromeIP][2] = 12 + ip;
}
}
// single bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 11; ir++) {
syndromeI += m_H[23*ir + i1] << (10-ir);
}
m_corr[syndromeI][0] = i1;
for (int ip1 = 0; ip1 < 11; ip1++) // 1 more bit flip in parity
{
int syndromeIP1 = syndromeI ^ (1 << (10-ip1));
m_corr[syndromeIP1][0] = i1;
m_corr[syndromeIP1][1] = 12 + ip1;
for (int ip2 = ip1+1; ip2 < 11; ip2++) // 1 more bit flip in parity
{
int syndromeIP2 = syndromeIP1 ^ (1 << (10-ip2));
m_corr[syndromeIP2][0] = i1;
m_corr[syndromeIP2][1] = 12 + ip1;
m_corr[syndromeIP2][2] = 12 + ip2;
}
}
}
// no bit patterns (in message) -> all in parity
for (int ip1 = 0; ip1 < 11; ip1++) // 1 bit flip in parity
{
int syndromeIP1 = (1 << (10-ip1));
m_corr[syndromeIP1][0] = 12 + ip1;
for (int ip2 = ip1+1; ip2 < 11; ip2++) // 1 more bit flip in parity
{
int syndromeIP2 = syndromeIP1 ^ (1 << (10-ip2));
m_corr[syndromeIP2][0] = 12 + ip1;
m_corr[syndromeIP2][1] = 12 + ip2;
for (int ip3 = ip2+1; ip3 < 11; ip3++) // 1 more bit flip in parity
{
int syndromeIP3 = syndromeIP2 ^ (1 << (10-ip3));
m_corr[syndromeIP3][0] = 12 + ip1;
m_corr[syndromeIP3][1] = 12 + ip2;
m_corr[syndromeIP3][2] = 12 + ip3;
}
}
}
}
// Not very efficient but encode is used for unit testing only
void Golay_23_12::encode(unsigned char *origBits, unsigned char *encodedBits)
{
memset(encodedBits, 0, 23);
for (int i = 0; i < 12; i++) // orig bits
{
for (int j = 0; j < 23; j++) // codeword bits
{
encodedBits[j] += origBits[i] * m_G[23*i + j];
}
}
for (int i = 0; i < 23; i++)
{
encodedBits[i] %= 2;
}
}
bool Golay_23_12::decode(unsigned char *rxBits)
{
unsigned int syndromeI = 0; // syndrome index
for (int is = 0; is < 11; is++)
{
syndromeI += (((rxBits[0] * m_H[23*is + 0])
+ (rxBits[1] * m_H[23*is + 1])
+ (rxBits[2] * m_H[23*is + 2])
+ (rxBits[3] * m_H[23*is + 3])
+ (rxBits[4] * m_H[23*is + 4])
+ (rxBits[5] * m_H[23*is + 5])
+ (rxBits[6] * m_H[23*is + 6])
+ (rxBits[7] * m_H[23*is + 7])
+ (rxBits[8] * m_H[23*is + 8])
+ (rxBits[9] * m_H[23*is + 9])
+ (rxBits[10] * m_H[23*is + 10])
+ (rxBits[11] * m_H[23*is + 11])
+ (rxBits[12] * m_H[23*is + 12])
+ (rxBits[13] * m_H[23*is + 13])
+ (rxBits[14] * m_H[23*is + 14])
+ (rxBits[15] * m_H[23*is + 15])
+ (rxBits[16] * m_H[23*is + 16])
+ (rxBits[17] * m_H[23*is + 17])
+ (rxBits[18] * m_H[23*is + 18])
+ (rxBits[19] * m_H[23*is + 19])
+ (rxBits[20] * m_H[23*is + 20])
+ (rxBits[21] * m_H[23*is + 21])
+ (rxBits[22] * m_H[23*is + 22])) % 2) << (10-is);
}
if (syndromeI > 0)
{
int i = 0;
for (; i < 3; i++)
{
if (m_corr[syndromeI][i] == 0xFF)
{
break;
}
else
{
rxBits[m_corr[syndromeI][i]] ^= 1; // flip bit
}
}
if (i == 0)
{
return false;
}
}
return true;
}
// ========================================================================================
Golay_24_12::Golay_24_12()
{
init();
}
Golay_24_12::~Golay_24_12()
{
}
void Golay_24_12::init()
{
memset (m_corr, 0xFF, 3*4096);
for (int i1 = 0; i1 < 12; i1++)
{
for (int i2 = i1+1; i2 < 12; i2++)
{
for (int i3 = i2+1; i3 < 12; i3++)
{
// 3 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 12; ir++)
{
syndromeI += ((m_H[24*ir + i1] + m_H[24*ir + i2] + m_H[24*ir + i3]) % 2) << (11-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
m_corr[syndromeI][2] = i3;
}
// 2 bit patterns
int syndromeI = 0;
for (int ir = 0; ir < 12; ir++)
{
syndromeI += ((m_H[24*ir + i1] + m_H[24*ir + i2]) % 2) << (11-ir);
}
m_corr[syndromeI][0] = i1;
m_corr[syndromeI][1] = i2;
// 1 possible bit flip left in the parity part