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quick and dirty packed bits for the BCH encoder

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This commit is contained in:
Ahmet Inan 2018-09-22 14:50:25 +02:00
commit 1f354379d3
2 changed files with 101 additions and 5 deletions
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40
tests/bch_encoder_test.cc
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@ -12,9 +12,43 @@ Copyright 2018 Ahmet Inan <inan@aicodix.de>
int main()
{
if (1) {
// NASA INTRO BCH(15, 5) T=3
typedef CODE::BoseChaudhuriHocquenghemEncoder<15, 5> BCH;
const int L = (BCH::N + 7) / 8;
BCH encode({0b10011, 0b11111, 0b00111});
uint8_t code[L] = { 0b11001000 };
uint8_t target[L] = { 0b11001000, 0b11110100 };
encode(code);
for (int i = 0; i < L; ++i)
assert(code[i] == target[i]);
}
if (1) {
// DVB-S2 FULL BCH(65535, 65343) T=12
typedef CODE::BoseChaudhuriHocquenghemEncoder<65535, 65343> BCH;
const int L = (BCH::N + 7) / 8;
BCH *encode = new BCH({0b10000000000101101, 0b10000000101110011, 0b10000111110111101, 0b10101101001010101, 0b10001111100101111, 0b11111011110110101, 0b11010111101100101, 0b10111001101100111, 0b10000111010100001, 0b10111010110100111, 0b10011101000101101, 0b10001101011100011});
uint8_t *target = new uint8_t[L];
for (int i = 0; i < L; ++i)
target[i] = 0;
for (int i = 0, s = 0; i < BCH::K; ++i, s=(s*(s*s*51767+71287)+35149)&0xffffff)
target[i/8] |= ((s^=s>>7)&1) << (7-i%8);
uint8_t *code = new uint8_t[L];
for (int i = 0; i < L; ++i)
code[i] = target[i];
bool parity[BCH::NP] = { 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 < BCH::NP; ++i)
target[(BCH::K+i)/8] |= parity[i] << (7-(BCH::K+i)%8);
(*encode)(code);
for (int i = 0; i < L; ++i)
assert(code[i] == target[i]);
delete[] target;
delete[] code;
delete encode;
}
if (0) {
// NASA INTRO BCH(15, 5) T=3
typedef CODE::GaloisField<4, 0b10011, uint8_t> GF;
typedef CODE::BoseChaudhuriHocquenghemEncoder<6, 1, 5, GF> BCH;
typedef CODE::BoseChaudhuriHocquenghemEncoderReference<6, 1, 5, GF> BCH;
GF instance;
BCH encode({0b10011, 0b11111, 0b00111});
uint8_t code[BCH::N] = { 1, 1, 0, 0, 1 };
@ -23,10 +57,10 @@ int main()
for (int i = 0; i < BCH::N; ++i)
assert(code[i] == target[i]);
}
if (1) {
if (0) {
// DVB-S2 FULL BCH(65535, 65343) T=12
typedef CODE::GaloisField<16, 0b10000000000101101, uint16_t> GF;
typedef CODE::BoseChaudhuriHocquenghemEncoder<24, 1, 65343, GF> BCH;
typedef CODE::BoseChaudhuriHocquenghemEncoderReference<24, 1, 65343, GF> BCH;
GF *instance = new GF();
BCH *encode = new BCH({0b10000000000101101, 0b10000000101110011, 0b10000111110111101, 0b10101101001010101, 0b10001111100101111, 0b11111011110110101, 0b11010111101100101, 0b10111001101100111, 0b10000111010100001, 0b10111010110100111, 0b10011101000101101, 0b10001101011100011});
uint16_t *code = new uint16_t[BCH::N];