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moved initial metric of hard decision to the top

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This commit is contained in:
Ahmet Inan 2020-06-09 12:54:47 +02:00
commit 0ebdada99a
1 changed files with 12 additions and 3 deletions
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15
short_bch_code_decoder.hh
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@ -71,10 +71,19 @@ public:
int cw = 0;
for (int i = 0; i < N; ++i)
cw |= (code[i] < 0) << i;
int word = (*this)(cw);
// hard decision
if (0)
return (*this)(cw);
int word = 0, best = 0;
return word;
int best = 0;
// metric of hard decision
if (1) {
int lol = 8 * sizeof(word) - 1;
int sum = 0;
for (int i = 0; i < N; ++i)
sum += ((word << (lol-i)) >> lol) * code[i];
best = sum;
}
// flip each bit and see ..
if (0) {
for (int j = 0; j < N; ++j) {
@ -111,7 +120,7 @@ public:
worst[3] = i;
}
}
for (int j = 0; j < (1 << num); ++j) {
for (int j = 1; j < (1 << num); ++j) {
int tmp = 0;
for (int i = 0; i < num; ++i)
tmp |= ((j>>i)&1) << worst[i];