Variable code rate and signal constellation turbo trellis...

Details Variable code rate and signal constellation turbo trellis... Variable code rate and signal constellation turbo trellis...

2006-08-15

2006-08-15

Lamarre, Guy J. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S796000, C375S265000, C375S279000, C375S295000, C375S298000, C375S316000, C375S308000, C375S329000

Reexamination Certificate

active

07093187

ABSTRACT:
Variable code rate and signal constellation turbo trellis coded modulation (TTCM) codec. A common trellis is employed at both ends of a communication system (in an encoder and decoder) to code and decode data at different rates. The encoding employs a single TTCM encoder whose output bits may be selectively punctured to support multiple modulations (constellations and mappings) according to a rate control sequence. A single TTCM decoder is operable to decode each of the various rates at which the data is encoded by the TTCM encoder. The rate control sequence may include a number of rate controls arranged in a period that is repeated during encoding and decoding. Either one or both of the encoder and decoder may adaptively select a new rate control sequence based on operating conditions of the communication system, such as a change in signal to noise ratio (SNR).

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