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trimmed modes to free some bits in first symbol

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This commit is contained in:
Ahmet Inan 2025-07-13 08:23:34 +02:00
commit 34abccdf6e
7 changed files with 32 additions and 224 deletions
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19
decode.cc
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@ -140,12 +140,7 @@ struct Decoder : Common
}
void shuffle(code_type *dest, const code_type *src)
{
if (code_order == 11) {
CODE::XorShiftMask<int, 11, 1, 3, 4, 1> seq;
dest[0] = src[0];
for (int i = 1; i < 2048; ++i)
dest[seq()] = src[i];
} else if (code_order == 12) {
if (code_order == 12) {
CODE::XorShiftMask<int, 12, 1, 1, 4, 1> seq;
dest[0] = src[0];
for (int i = 1; i < 4096; ++i)
@ -238,13 +233,13 @@ struct Decoder : Common
seq1();
}
int mode = hadamard_decoder(meta);
if (mode < 0 || mode > 27) {
if (mode < 0 || mode > 7) {
std::cerr << "operation mode " << mode << " unsupported." << std::endl;
continue;
}
setup(mode);
std::cerr << "oper mode: " << oper_mode << std::endl;
if (oper_mode >= 10) {
if (oper_mode >= 3) {
for (int i = 0; i < tone_count; ++i)
tone[i] *= DSP::polar<value>(1, tse(i+tone_off));
for (int i = 0; i < tone_count; ++i)
@ -339,9 +334,9 @@ struct Decoder : Common
cmplx hard(1, 0);
if (i % block_length != meta_off && i % block_length != seed_off) {
int bits = mod_bits;
if (oper_mode >= 7 && oper_mode <= 9 && l % 32 == 30)
if (oper_mode == 2 && l % 32 == 30)
bits = 2;
if (oper_mode >= 21 && oper_mode <= 23 && l % 64 == 60)
if (oper_mode == 6 && l % 64 == 60)
bits = 4;
demap_hard(perm+l, demod[i], bits);
hard = map_bits(perm+l, bits);
@ -357,9 +352,9 @@ struct Decoder : Common
for (int i = 0; i < tone_count; ++i) {
if (i % block_length != meta_off && i % block_length != seed_off) {
int bits = mod_bits;
if (oper_mode >= 7 && oper_mode <= 9 && k % 32 == 30)
if (oper_mode == 2 && k % 32 == 30)
bits = 2;
if (oper_mode >= 21 && oper_mode <= 23 && k % 64 == 60)
if (oper_mode == 6 && k % 64 == 60)
bits = 4;
demap_soft(perm+k, demod[i], precision, bits);
k += bits;