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skew pilot and reserved tones

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This commit is contained in:
Ahmet Inan 2025-07-01 08:26:28 +02:00
commit 838155c063
2 changed files with 16 additions and 9 deletions
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7
encode.cc
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@ -40,6 +40,7 @@ struct Encoder
static const int reserved_tones = 32;
static const int tone_count = data_tones + pilot_tones + reserved_tones;
static const int block_length = 10;
static const int block_skew = 3;
static const int pilot_offset = 4;
static const int reserved_offset = 9;
DSP::WritePCM<value> *pcm;
@ -354,10 +355,12 @@ struct Encoder
shuffle(perm, code);
CODE::MLS seq1(mls1_poly);
for (int j = 0, k = 0; j < symbol_count; ++j) {
int poff = (block_skew * j + pilot_offset) % block_length;
int roff = (block_skew * j + reserved_offset) % block_length;
for (int i = 0, m = 0; i < tone_count; ++i) {
if (i % block_length == pilot_offset) {
if (i % block_length == poff) {
tone[i] = nrz(seq1()) * mode[m++];
} else if (i % block_length == reserved_offset) {
} else if (i % block_length == roff) {
tone[i] = 0;
} else {
tone[i] = mod_map(perm+k);