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use a shorter MLS for leading noise

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This commit is contained in:
Ahmet Inan 2025-07-01 23:41:18 +02:00
commit 53593d3350
2 changed files with 6 additions and 7 deletions
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2
decode.cc
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@ -46,7 +46,7 @@ struct Decoder
static const int bits_max = 1 << code_max;
static const int data_max = 4096;
static const int symbols_max = 44;
static const int mls0_poly = 0b1100110001;
static const int mls0_poly = 0x331;
static const int mls0_seed = 214;
static const int mls1_poly = 0x25;
static const int buffer_len = 5 * extended_len;

11
encode.cc
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@ -31,10 +31,9 @@ struct Encoder
static const int symbol_len = guard_len * 16;
static const int bits_max = 65536;
static const int data_max = 4096;
static const int mls0_poly = 0b1100110001;
static const int mls0_poly = 0x331;
static const int mls0_seed = 214;
static const int mls1_poly = 0x25;
static const int mls2_poly = 0b100101010001;
static const int data_tones = 256;
static const int pilot_tones = 32;
static const int reserved_tones = 32;
@ -148,11 +147,11 @@ struct Encoder
for (int i = 0; i < guard_len; ++i)
guard[i] = tdom[i];
}
void pilot_block()
void leading_noise()
{
CODE::MLS seq2(mls2_poly);
CODE::MLS noise(0x163);
for (int i = 0; i < tone_count; ++i)
tone[i] = nrz(seq2());
tone[i] = nrz(noise());
symbol(false);
}
void schmidl_cox()
@ -369,7 +368,7 @@ struct Encoder
setup(oper_mode, freq_off);
guard_interval_weights();
papr_min = 1000, papr_max = -1000;
pilot_block();
leading_noise();
hadamardenc(mode, oper_mode);
if (!oper_mode) {
schmidl_cox();