Tail-biting turbo-code encoder and associated decoder

Details Tail-biting turbo-code encoder and associated decoder Tail-biting turbo-code encoder and associated decoder

H - Electricity

04

L

H04L 1/22 (2006.01) H03M 13/23 (2006.01) H03M 13/27 (2006.01) H03M 13/29 (2006.01) H03M 13/41 (2006.01) H03M 13/45 (2006.01)

Patent

CA 2273418

A method of creating tail-biting recursive systematic convolutional and turbo codes, and the associated encoders and decoders, are described herein. According to the method, symbols from the set of data to be transmitted are used to preset the starting state of the encoder, and are replaced in a systematic set by an equivalent number of tail--biting symbols that force the ending state of the encoder to be the same as the starting state. The presetting of the starting state allows for simpler calculations in computing the tail-biting codewords, and allows a message to be transmitted with a reduced number of symbols. The reduction in the number of symbols used for overhead in this invention provides an increase in the data transmission rate.

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