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FT8: implement Gray decoding when decoding from magnitudes

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This commit is contained in:
f4exb
2024-04-06 10:46:39 +02:00
parent 1691a3dfb3
commit cd7f0c16c4
3 changed files with 35 additions and 2 deletions
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ft8/ft8.cpp
+28 -1
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@@ -1233,6 +1233,32 @@ std::vector<std::vector<float>> FT8::un_gray_code_r(const std::vector<std::vecto
return m79a;
}
//
// Generic Gray decoding for magnitudes (floats)
//
std::vector<std::vector<float>> FT8::un_gray_code_r_gen(const std::vector<std::vector<float>> &mags)
{
if (mags.size() == 0) {
return mags;
}
std::vector<std::vector<float>> magsa(mags.size());
int nsyms = mags.front().size();
for (unsigned int si = 0; si < mags.size(); si++)
{
magsa[si].resize(nsyms);
for (int bini = 0; bini < nsyms; bini++)
{
int grayi = bini ^ (bini >> 1);
magsa[si][bini] = mags[si][grayi];
}
}
return magsa;
}
//
// normalize levels by windowed median.
// this helps, but why?
@@ -1919,6 +1945,7 @@ void FT8::soft_decode_mags(FT8Params& params, const std::vector<std::vector<floa
Stats bests(params.problt_how_sig, params.log_tail, params.log_rate);
Stats all(params.problt_how_noise, params.log_tail, params.log_rate);
make_stats_gen(mags, nbSymbolBits, bests, all);
mags = un_gray_code_r_gen(mags);
int lli = 0;
int zoX = 1<<(nbSymbolBits-1);
int zoY = nbSymbolBits;
@@ -3188,7 +3215,7 @@ int FT8::one_iter1(
hz1_for_cb,
params.use_osd,
"",
m79
m79
);
if (ret) {