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replaced reserved tones with pilot tones

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This commit is contained in:
Ahmet Inan 2025-07-10 17:45:07 +02:00
commit 04beed4a4c
3 changed files with 16 additions and 61 deletions
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12
decode.cc
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@ -49,7 +49,7 @@ struct Decoder : Common
DSP::BipBuffer<cmplx, buffer_len> input_hist;
DSP::TheilSenEstimator<value, tone_count> tse;
SchmidlCox<value, cmplx, search_pos, symbol_len, guard_len> correlator;
CODE::HadamardDecoder<6> hadamard_decoder;
CODE::HadamardDecoder<7> hadamard_decoder;
CODE::PolarListDecoder<mesg_type, code_max> polar_decoder;
mesg_type mesg[bits_max];
code_type code[bits_max], perm[bits_max];
@ -251,7 +251,6 @@ struct Decoder : Common
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());
@ -294,20 +293,17 @@ struct Decoder : Common
chan[i] *= DSP::polar<value>(1, tse(i+tone_off));
if (differential) {
for (int i = 0; i < tone_count; ++i)
if (i % block_length != reserved_off)
chan[i] = fdom[bin(i+tone_off)];
chan[i] = fdom[bin(i+tone_off)];
} else {
for (int i = pilot_off; i < tone_count; i += block_length)
chan[i] = DSP::lerp(chan[i], tone[i], value(0.5));
}
CODE::MLS seq(0x163, meta_data);
for (int i = 0; i < tone_count; ++i)
if (i % block_length != pilot_off && i % block_length != reserved_off)
if (i % block_length != pilot_off)
demod[i] *= nrz(seq());
value sp = 0, np = 0;
for (int i = 0, l = k; i < tone_count; ++i) {
if (i % block_length == reserved_off)
continue;
cmplx hard(1, 0);
if (i % block_length != pilot_off) {
int bits = mod_bits;
@ -329,8 +325,6 @@ struct Decoder : Common
for (int i = 0; i < tone_count; ++i) {
if (i % block_length == pilot_off)
continue;
if (i % block_length == reserved_off)
continue;
int bits = mod_bits;
if (oper_mode >= 7 && oper_mode <= 9 && k % 32 == 30)
bits = 2;