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added encoder and syndrome decoder for short BCH codes

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Ahmet Inan 2020-06-07 18:28:25 +02:00
commit 5d944ca7a9
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tests/short_bch_code_decoder_test.cc Normal file
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/*
Test for the short BCH codes decoder
Copyright 2020 Ahmet Inan <inan@aicodix.de>
*/
#include <cassert>
#include <random>
#include <iostream>
#include <functional>
#include "short_bch_code_decoder.hh"
int main()
{
std::random_device rd;
std::default_random_engine generator(rd());
if (1) {
// Perfect binary Golay code using x^11+x^9+x^7+x^6+x^5+x+1
const int N = 23, K = 12, T = 3, POLY = 0b101011100011;
CODE::ShortBCHCodeDecoder<N, K> decode(POLY, T);
int target = 0b10101101101111011111001;
int damaged = target;
typedef std::uniform_int_distribution<int> distribution;
auto epos = std::bind(distribution(0, N-1), generator);
for (int i = 0; i < T; ++i)
damaged ^= 1 << epos();
int recovered = decode(damaged);
assert(recovered == target);
}
if (1) {
// Perfect binary Golay code using x^11+x^10+x^6+x^5+x^4+x^2+1
const int N = 23, K = 12, T = 3, POLY = 0b110001110101;
CODE::ShortBCHCodeDecoder<N, K> decode(POLY, T);
int target = 0b10101101101100100010101;
int damaged = target;
typedef std::uniform_int_distribution<int> distribution;
auto epos = std::bind(distribution(0, N-1), generator);
for (int i = 0; i < T; ++i)
damaged ^= 1 << epos();
int recovered = decode(damaged);
assert(recovered == target);
}
if (1) {
// NASA INTRO BCH(15, 5) T=3
const int N = 15, K = 5, T = 3, POLY = 0b10100110111;
CODE::ShortBCHCodeDecoder<N, K> decode(POLY, T);
int target = 0b110010001111010;
int damaged = target;
typedef std::uniform_int_distribution<int> distribution;
auto epos = std::bind(distribution(0, N-1), generator);
for (int i = 0; i < T; ++i)
damaged ^= 1 << epos();
int recovered = decode(damaged);
assert(recovered == target);
}
std::cerr << "Short BCH code decoder test passed!" << std::endl;
return 0;
}