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added Reed Solomon error correction

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lifted from my FEC project:
https://github.com/xdsopl/FEC
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Ahmet Inan 2018-09-20 18:04:23 +02:00
commit 01db8f516e
10 changed files with 846 additions and 1 deletions
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tests/bch_decoder_test.cc Normal file
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/*
Test for the Bose Chaudhuri Hocquenghem Decoder
Copyright 2018 Ahmet Inan <inan@aicodix.de>
*/
#include <cassert>
#include <random>
#include <iostream>
#include "galois_field.hh"
#include "bose_chaudhuri_hocquenghem_decoder.hh"
int main()
{
std::random_device rd;
std::default_random_engine generator(rd());
if (1) {
// NASA INTRO BCH(15, 5) T=3
typedef CODE::GaloisField<4, 0b10011, uint8_t> GF;
typedef CODE::BoseChaudhuriHocquenghemDecoder<6, 1, 5, GF> BCH;
GF instance;
BCH decode;
uint8_t target[15] = { 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0 };
uint8_t code[15];
for (int i = 0; i < 15; ++i)
code[i] = target[i];
std::uniform_int_distribution<uint8_t> distribution(0, 15);
auto noise = std::bind(distribution, generator);
for (int i = 0; i < 3; ++i)
code[noise()] ^= 1;
decode(code);
for (int i = 0; i < 15; ++i)
assert(code[i] == target[i]);
}
if (1) {
// DVB-S2 FULL BCH(65535, 65343) T=12
typedef CODE::GaloisField<16, 0b10000000000101101, uint16_t> GF;
typedef CODE::BoseChaudhuriHocquenghemDecoder<24, 1, 65343, GF> BCH;
GF *instance = new GF();
BCH *decode = new BCH();
uint16_t *target = new uint16_t[65535];
for (int i = 0, s = 0; i < 65343; ++i, s=(s*(s*s*51767+71287)+35149)&0xffffff)
target[i] = (s^=s>>7)&1;
uint16_t parity[192] = { 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0 };
for (int i = 0; i < 192; ++i)
target[65343+i] = parity[i];
uint16_t *code = new uint16_t[65535];
for (int i = 0; i < 65535; ++i)
code[i] = target[i];
std::uniform_int_distribution<uint16_t> distribution(0, 65535);
auto noise = std::bind(distribution, generator);
for (int i = 0; i < 12; ++i)
code[noise()] ^= 1;
(*decode)(code);
for (int i = 0; i < 65535; ++i)
assert(code[i] == target[i]);
delete[] target;
delete[] code;
delete decode;
delete instance;
}
std::cerr << "Bose Chaudhuri Hocquenghem Decoder test passed!" << std::endl;
return 0;
}