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convolve message bits only for now

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This commit is contained in:
Ahmet Inan 2025-12-22 22:22:30 +01:00
commit 9e085cc2fd
2 changed files with 72 additions and 46 deletions
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13
pac_encoder.hh
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@ -18,13 +18,22 @@ class PACEncoder
{
return (bits[idx/32] >> (idx%32)) & 1;
}
static bool conv(int *state, bool input)
{
bool s1 = *state & 1;
bool s2 = *state & 2;
bool output = input ^ s1 ^ s2;
*state = (s1 << 1) | output;
return output;
}
public:
void operator()(TYPE *codeword, const TYPE *message, const uint32_t *frozen, int level)
{
int length = 1 << level;
int state = 0;
for (int i = 0; i < length; i += 2) {
TYPE msg0 = get(frozen, i) ? PH::one() : *message++;
TYPE msg1 = get(frozen, i+1) ? PH::one() : *message++;
TYPE msg0 = get(frozen, i) ? PH::one() : 1 - 2 * conv(&state, *message++ < 0);
TYPE msg1 = get(frozen, i+1) ? PH::one() : 1 - 2 * conv(&state, *message++ < 0);
codeword[i] = PH::qmul(msg0, msg1);
codeword[i+1] = msg1;
}