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encoder and soft decoder for augmented Hadamard codes

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Ahmet Inan 2020-06-11 23:11:31 +02:00
commit 43c5d6a91a
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/*
Encoder for augmented Hadamard codes
Copyright 2020 Ahmet Inan <inan@aicodix.de>
*/
#pragma once
namespace CODE {
template <int K>
class HadamardEncoder
{
static const int W = 1 << K;
static const int N = 1 << (K - 1);
int8_t mod[W];
static bool parity(unsigned x)
{
x ^= x >> 16;
x ^= x >> 8;
x ^= x >> 4;
x ^= x >> 2;
x ^= x >> 1;
return x & 1;
}
public:
HadamardEncoder()
{
for (int i = 0; i < W; ++i)
mod[i] = 1 - 2 * parity(i);
}
void operator()(int8_t *code, int msg)
{
for (int i = 0; i < N; ++i)
code[i] = mod[msg&(i|N)];
}
};
}