Mirror/aicodix___modem
1
0
Fork 0
mirror of https://github.com/aicodix/modem.git synced 2026-04-27 22:35:41 +00:00
Code Issues Projects Releases Packages Wiki Activity

added mls2_poly

Browse source
This commit is contained in:
Ahmet Inan 2025-07-11 10:40:56 +02:00
commit 5343144b3c
3 changed files with 6 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

1
common.hh
View file

@ -19,6 +19,7 @@ struct Common
static const int mls0_poly = 0x331;
static const int mls0_seed = 214;
static const int mls1_poly = 0x43;
static const int mls2_poly = 0x163;
static const int data_tones = 256;
static const int pilot_tones = 64;
static const int tone_count = data_tones + pilot_tones;

4
decode.cc
View file

@ -298,10 +298,10 @@ struct Decoder : Common
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);
CODE::MLS seq2(mls2_poly, meta_data);
for (int i = 0; i < tone_count; ++i)
if (i % block_length != pilot_off)
demod[i] *= nrz(seq());
demod[i] *= nrz(seq2());
value sp = 0, np = 0;
for (int i = 0, l = k; i < tone_count; ++i) {
cmplx hard(1, 0);

6
encode.cc
View file

@ -86,12 +86,12 @@ struct Encoder : public Common
if (symbol_number >= 0) {
int meta_data = symbol_number ? trial : (oper_mode | (trial << 5));
hadamard_encoder(meta, meta_data);
CODE::MLS seq(0x163, meta_data);
CODE::MLS seq2(mls2_poly, meta_data);
for (int i = 0, m = 0; i < tone_count; ++i)
if (i % block_length == pilot_off)
temp[i] *= meta[m++];
else
temp[i] *= nrz(seq());
temp[i] *= nrz(seq2());
}
for (int i = 0; i < symbol_len; ++i)
fdom[i] = 0;
@ -143,7 +143,7 @@ struct Encoder : public Common
}
void leading_noise(int num = 1)
{
CODE::MLS noise(0x163);
CODE::MLS noise(mls2_poly);
for (int j = 0; j < num; ++j) {
for (int i = 0; i < tone_count; ++i)
tone[i] = nrz(noise());