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limit the amount of damage clipping can do

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This commit is contained in:
Ahmet Inan 2023-12-15 12:39:05 +01:00
commit a37246b7a0
1 changed files with 14 additions and 5 deletions
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19
encode.cc
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@ -74,12 +74,21 @@ struct Encoder
tdom[i] /= sqrt(pwr);
}
fwd(temp, tdom);
for (int i = 0; i < symbol_len; ++i)
if (norm(fdom[i]))
temp[i] /= symbol_len;
else
for (int i = 0; i < symbol_len; ++i) {
if (norm(fdom[i])) {
temp[i] /= std::sqrt(value(symbol_len/4));
cmplx err = temp[i] - fdom[i];
value mag = abs(err);
value lim = 0.1;
if (mag > lim)
temp[i] -= ((mag - lim) / mag) * err;
} else {
temp[i] = 0;
}
}
bwd(tdom, temp);
for (int i = 0; i < symbol_len; ++i)
tdom[i] /= std::sqrt(value(symbol_len*4));
}
void tone_reservation()
{
@ -99,7 +108,7 @@ struct Encoder
{
bwd(tdom, fdom);
for (int i = 0; i < symbol_len; ++i)
tdom[i] /= std::sqrt(value(4*symbol_len));
tdom[i] /= std::sqrt(value(symbol_len*4));
if (papr_reduction) {
clipping_and_filtering();
tone_reservation();