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This commit is contained in:
Ahmet Inan 2025-07-19 11:34:08 +02:00
commit 3d61323f1b
1 changed files with 25 additions and 4 deletions
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29
common.hh
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@ -15,7 +15,7 @@ struct Common
static const int mod_max = 12;
static const int code_max = 16;
static const int bits_max = 1 << code_max;
static const int data_max = 4096;
static const int data_max = 8192;
static const int symbols_max = 26 + 1;
static const int mls0_poly = 0x331;
static const int mls0_seed = 214;
@ -59,6 +59,7 @@ struct Common
std::cerr << "analog mode not supported yet" << std::endl;
return false;
}
std::cerr << "modulation: ";
int modulation = (mode >> 4) & 7;
switch (modulation) {
case 0:
@ -66,54 +67,64 @@ struct Common
symbol_count = 8;
differential = true;
code_order = 11;
std::cerr << "DBPSK";
break;
case 1:
mod_bits = 2;
symbol_count = 4;
differential = true;
code_order = 11;
std::cerr << "DQPSK";
break;
case 2:
mod_bits = 3;
symbol_count = 11;
differential = true;
code_order = 13;
std::cerr << "D8PSK";
break;
case 3:
mod_bits = 4;
symbol_count = 4;
differential = false;
code_order = 12;
std::cerr << "QAM16";
break;
case 4:
mod_bits = 6;
symbol_count = 11;
differential = false;
code_order = 14;
std::cerr << "QAM64";
break;
case 5:
mod_bits = 8;
symbol_count = 8;
differential = false;
code_order = 14;
std::cerr << "QAM256";
break;
case 6:
mod_bits = 10;
symbol_count = 13;
differential = false;
code_order = 15;
std::cerr << "QAM1024";
break;
case 7:
mod_bits = 12;
symbol_count = 11;
differential = false;
code_order = 15;
std::cerr << "QAM4096";
break;
default:
return false;
}
bool frame_length = mode & 1;
if (frame_length) {
std::cerr << std::endl;
bool frame_size = mode & 1;
std::cerr << "frame size: " << (frame_size ? "normal" : "short") << std::endl;
if (frame_size) {
if (symbol_count == 4) {
symbol_count *= 4;
code_order += 2;
@ -123,7 +134,9 @@ struct Common
}
}
int code_rate = (mode >> 1) & 7;
std::cerr << "code rate: ";
if (code_rate == 0) {
std::cerr << "1/2";
switch (code_order) {
case 11:
data_bits = 1024;
@ -153,6 +166,7 @@ struct Common
return false;
}
} else if (code_rate == 1) {
std::cerr << "2/3";
switch (code_order) {
case 11:
data_bits = 1368;
@ -182,6 +196,7 @@ struct Common
return false;
}
} else if (code_rate == 2) {
std::cerr << "3/4";
switch (code_order) {
case 11:
data_bits = 1536;
@ -211,6 +226,7 @@ struct Common
return false;
}
} else if (code_rate == 3) {
std::cerr << "5/6";
switch (code_order) {
case 11:
data_bits = 1704;
@ -240,11 +256,16 @@ struct Common
return false;
}
} else {
std::cerr << "code rate " << code_rate << " not supported yet" << std::endl;
std::cerr << "unsupported" << std::endl;
return false;
}
std::cerr << std::endl;
oper_mode = mode;
data_bytes = data_bits / 8;
float duration = 41. / 300. * (3 + symbol_count);
std::cerr << "duration: " << duration << "s" << std::endl;
std::cerr << "payload: " << data_bytes << "B" << std::endl;
std::cerr << "bitrate: " << data_bits / duration / 1000. << "kb/s" << std::endl;
return true;
}
};