Module p25::coding::trellis
[−]
[src]
Implements encoding and decoding of the "trellis" convolutional error correcting code specified by P25.
Encoding is done with a state machine and decoding is done with the Viterbi algorithm, adapted from Coding Theory and Cryptography: The Essentials, Hankerson, Hoffman, et al, 2000.
Structs
| DibitHistory | |
| DibitStates |
Half-rate state machine (dibit input). |
| DibitWalks | |
| TrellisFSM |
Convolutional code finite state machine with the given transition table. Each fed-in symbol is used as the next state. |
| TribitHistory | |
| TribitStates |
3/4-rate state machine (tribit input). |
| TribitWalks | |
| ViterbiDecoder |
Decodes a received convolutional code dibit stream to a nearby codeword using the truncated Viterbi algorithm. |
| Walk |
Traits
| States | |
| WalkHistory | |
| Walks |
Type Definitions
| DibitDecoder |
Half-rate convolution ("trellis") code decoder. |
| DibitFSM |
Half-rate convolutional ("trellis") code state machine. |
| TribitDecoder |
3/4-rate convolution ("trellis") code decoder. |
| TribitFSM |
3/4-rate convolutional ("trellis") code state machine. |