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signal mode using pilots of the first symbol only

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This commit is contained in:
Ahmet Inan 2025-07-07 22:38:36 +02:00
commit 3755c666aa
2 changed files with 15 additions and 9 deletions
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16
decode.cc
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@ -214,6 +214,8 @@ struct Decoder : Common
setup(oper_mode);
std::cerr << "Es/N0 (dB):";
for (int j = 0, k = 0; j < symbol_count; ++j) {
pilot_off = (block_skew * j + first_pilot) % block_length;
reserved_off = (block_skew * j + first_reserved) % block_length;
if (j) {
for (int i = 0; i < extended_len; ++i)
correlator(buf = next_sample());
@ -222,18 +224,20 @@ struct Decoder : Common
for (int i = 0; i < guard_len; ++i)
osc();
fwd(fdom, tdom);
for (int i = 0; i < tone_count; ++i)
tone[i] = fdom[bin(i+tone_off)];
} else {
for (int i = 0; i < symbol_pos+symbol_len+extended_len; ++i)
correlator(buf = next_sample());
seq1.reset();
hadamard_encoder(mode, oper_mode);
for (int i = 0; i < tone_count; ++i)
tone[i] = fdom[bin(i+tone_off)];
for (int i = 0; i < pilot_tones; ++i)
tone[block_length*i+pilot_off] *= mode[i];
seq1.reset();
}
for (int i = 0; i < tone_count; ++i)
tone[i] = fdom[bin(i+tone_off)];
pilot_off = (block_skew * j + first_pilot) % block_length;
reserved_off = (block_skew * j + first_reserved) % block_length;
for (int i = 0; i < pilot_tones; ++i)
tone[block_length*i+pilot_off] *= nrz(seq1()) * mode[i];
tone[block_length*i+pilot_off] *= nrz(seq1());
for (int i = 0; i < tone_count; ++i)
demod[i] = demod_or_erase(tone[i], chan[i]);
for (int i = 0; i < pilot_tones; ++i) {