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added code rates 2/3, 3/4 and 5/6

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scaling factors for erasure probability derived from 1/2-rate code
This commit is contained in:
Ahmet Inan 2025-07-19 07:38:46 +02:00
commit 47e8aaf662
3 changed files with 140 additions and 12 deletions
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87
common.hh
View file

@ -152,6 +152,93 @@ struct Common
default:
return false;
}
} else if (code_rate == 1) {
switch (code_order) {
case 11:
data_bits = 1368;
frozen_bits = frozen_2048_1400;
break;
case 12:
data_bits = 2736;
frozen_bits = frozen_4096_2768;
break;
case 13:
data_bits = 5472;
frozen_bits = frozen_8192_5504;
break;
case 14:
data_bits = 10944;
frozen_bits = frozen_16384_10976;
break;
case 15:
data_bits = 21888;
frozen_bits = frozen_32768_21920;
break;
case 16:
data_bits = 43776;
frozen_bits = frozen_65536_43808;
break;
default:
return false;
}
} else if (code_rate == 2) {
switch (code_order) {
case 11:
data_bits = 1536;
frozen_bits = frozen_2048_1568;
break;
case 12:
data_bits = 3072;
frozen_bits = frozen_4096_3104;
break;
case 13:
data_bits = 6144;
frozen_bits = frozen_8192_6176;
break;
case 14:
data_bits = 12288;
frozen_bits = frozen_16384_12320;
break;
case 15:
data_bits = 24576;
frozen_bits = frozen_32768_24608;
break;
case 16:
data_bits = 49152;
frozen_bits = frozen_65536_49184;
break;
default:
return false;
}
} else if (code_rate == 3) {
switch (code_order) {
case 11:
data_bits = 1704;
frozen_bits = frozen_2048_1736;
break;
case 12:
data_bits = 3408;
frozen_bits = frozen_4096_3440;
break;
case 13:
data_bits = 6816;
frozen_bits = frozen_8192_6848;
break;
case 14:
data_bits = 13632;
frozen_bits = frozen_16384_13664;
break;
case 15:
data_bits = 27264;
frozen_bits = frozen_32768_27296;
break;
case 16:
data_bits = 54528;
frozen_bits = frozen_65536_54560;
break;
default:
return false;
}
} else {
std::cerr << "code rate " << code_rate << " not supported yet" << std::endl;
return false;

35
freezer.cc
View file

@ -27,12 +27,35 @@ void code(int N, int K, double P)
int main()
{
code<16>(65536, 32768+32, 0.42);
code<15>(32768, 16384+32, 0.40);
code<14>(16384, 8192+32, 0.39);
code<13>(8192, 4096+32, 0.38);
code<12>(4096, 2048+32, 0.37);
code<11>(2048, 1024+32, 0.34);
// call sign and mode with 16 bit CRC
code<8>(256, 47+8+16, 0.5);
// 1/2-rate payload with 32 bit CRC
code<11>(2048, 1024+32, 0.34);
code<12>(4096, 2048+32, 0.37);
code<13>(8192, 4096+32, 0.38);
code<14>(16384, 8192+32, 0.39);
code<15>(32768, 16384+32, 0.40);
code<16>(65536, 32768+32, 0.42);
// 2/3-rate payload with 32 bit CRC
code<11>(2048, 1368+32, 0.22);
code<12>(4096, 2736+32, 0.24);
code<13>(8192, 5472+32, 0.25);
code<14>(16384, 10944+32, 0.26);
code<15>(32768, 21888+32, 0.27);
code<16>(65536, 43776+32, 0.28);
// 3/4-rate payload with 32 bit CRC
code<11>(2048, 1536+32, 0.16);
code<12>(4096, 3072+32, 0.18);
code<13>(8192, 6144+32, 0.19);
code<14>(16384, 12288+32, 0.19);
code<15>(32768, 24576+32, 0.20);
code<16>(65536, 49152+32, 0.21);
// 5/6-rate payload with 32 bit CRC
code<11>(2048, 1704+32, 0.11);
code<12>(4096, 3408+32, 0.12);
code<13>(8192, 6816+32, 0.13);
code<14>(16384, 13632+32, 0.13);
code<15>(32768, 27264+32, 0.13);
code<16>(65536, 54528+32, 0.14);
return 0;
}

30
polar_tables.hh
View file

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