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added payload sizes and bitrates for the new modes

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Ahmet Inan 2025-07-19 13:35:23 +02:00
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@ -41,7 +41,7 @@ diff -s uncoded.dat decoded.dat
### Supported Modes
All modes need a bandwidth of 2400 Hz.
All modes need a bandwidth of 2400 Hz and there are two frame sizes.
These are the durations for each differential modulation scheme:
@ -61,33 +61,109 @@ And these are the durations for each coherent modulation scheme:
| QAM1024 | 2.2s | 4.0s |
| QAM4096 | 1.9s | 3.4s |
Currently all digital modes use a 1/2-rate forward error correction code.
These are the numbers for the short modes with a 1/2 code rate:
Therefore we have the following byte payloads for each modulation:
| Modulation | Short | Normal |
| ---------- | ----- | ------ |
| DBPSK | 128B | 256B |
| DQPSK | 128B | 512B |
| D8PSK | 512B | 1024B |
| QAM16 | 256B | 1024B |
| QAM64 | 1024B | 2048B |
| QAM256 | 1024B | 2048B |
| QAM1024 | 2048B | 4096B |
| QAM4096 | 2048B | 4096B |
Which give us the following bitrates for each modulation:
| Modulation | Short | Normal |
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 681b/s | 789b/s |
| DQPSK | 1070b/s | 1577b/s |
| D8PSK | 2141b/s | 2398b/s |
| QAM16 | 2141b/s | 3155b/s |
| QAM64 | 4282b/s | 4795b/s |
| QAM256 | 5449b/s | 6310b/s |
| QAM1024 | 7493b/s | 8268b/s |
| QAM4096 | 8563b/s | 9591b/s |
| DBPSK | 128B | 0.7kb/s |
| DQPSK | 128B | 1.1kb/s |
| D8PSK | 512B | 2.1kb/s |
| QAM16 | 256B | 2.1kb/s |
| QAM64 | 1024B | 4.3kb/s |
| QAM256 | 1024B | 5.4kb/s |
| QAM1024 | 2048B | 7.5kb/s |
| QAM4096 | 2048B | 8.6kb/s |
These are the numbers for the normal modes with a 1/2 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 256B | 0.8kb/s |
| DQPSK | 512B | 1.6kb/s |
| D8PSK | 1024B | 2.4kb/s |
| QAM16 | 1024B | 3.2kb/s |
| QAM64 | 2048B | 4.8kb/s |
| QAM256 | 2048B | 6.3kb/s |
| QAM1024 | 4096B | 8.3kb/s |
| QAM4096 | 4096B | 9.6kb/s |
These are the numbers for the short modes with a 2/3 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 171B | 0.9kb/s |
| DQPSK | 171B | 1.4kb/s |
| D8PSK | 684B | 2.9kb/s |
| QAM16 | 342B | 2.9kb/s |
| QAM64 | 1368B | 5.7kb/s |
| QAM256 | 1368B | 7.3kb/s |
| QAM1024 | 2736B |10.0kb/s |
| QAM4096 | 2736B |11.4kb/s |
These are the numbers for the normal modes with a 2/3 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 342B | 1.1kb/s |
| DQPSK | 684B | 2.1kb/s |
| D8PSK | 1368B | 3.2kb/s |
| QAM16 | 1368B | 4.2kb/s |
| QAM64 | 2736B | 6.4kb/s |
| QAM256 | 2736B | 8.4kb/s |
| QAM1024 | 5472B |11.0kb/s |
| QAM4096 | 5472B |12.8kb/s |
These are the numbers for the short modes with a 3/4 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 192B | 1.0kb/s |
| DQPSK | 192B | 1.6kb/s |
| D8PSK | 768B | 3.2kb/s |
| QAM16 | 384B | 3.2kb/s |
| QAM64 | 1536B | 6.4kb/s |
| QAM256 | 1536B | 8.2kb/s |
| QAM1024 | 3072B |11.2kb/s |
| QAM4096 | 3072B |12.8kb/s |
These are the numbers for the normal modes with a 3/4 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 384B | 1.2kb/s |
| DQPSK | 768B | 2.4kb/s |
| D8PSK | 1536B | 3.6kb/s |
| QAM16 | 1536B | 4.7kb/s |
| QAM64 | 3072B | 7.2kb/s |
| QAM256 | 3072B | 9.5kb/s |
| QAM1024 | 6144B |12.4kb/s |
| QAM4096 | 6144B |14.4kb/s |
These are the numbers for the short modes with a 5/6 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 213B | 1.1kb/s |
| DQPSK | 213B | 1.8kb/s |
| D8PSK | 852B | 3.6kb/s |
| QAM16 | 426B | 3.6kb/s |
| QAM64 | 1704B | 7.1kb/s |
| QAM256 | 1704B | 9.1kb/s |
| QAM1024 | 3408B |12.5kb/s |
| QAM4096 | 3408B |14.2kb/s |
These are the numbers for the normal modes with a 5/6 code rate:
| Modulation | Payload | Bitrate |
| ---------- | ------- | ------- |
| DBPSK | 426B | 1.3kb/s |
| DQPSK | 852B | 2.6kb/s |
| D8PSK | 1704B | 4.0kb/s |
| QAM16 | 1704B | 5.2kb/s |
| QAM64 | 3408B | 8.0kb/s |
| QAM256 | 3408B |10.5kb/s |
| QAM1024 | 6816B |13.8kb/s |
| QAM4096 | 6816B |16.0kb/s |
### Simulating