Method and system for decoding tailbiting convolution codes

Details Method and system for decoding tailbiting convolution codes Method and system for decoding tailbiting convolution codes

H - Electricity

03

M

H03M 13/41 (2006.01) H03M 13/23 (2006.01)

Patent

CA 2250602

A method and system for decoding tailbiting convolution codes are disclosed. A set of tailbiting convolutional codes is encoded by a convolutionalencoder having multiple encoding states. A first starting score is assigned to each of the encoding states. A Viterbi algorithm is then performed once on the tailbiting convolutional code to associate an ending score with each of the encoding states. A subset of these encoding states is subsequently selected, within which the ending score of each encoding state meets a certain criterion. The Viterbi algorithm is again performed on the tailbiting convolutional code for each encoding state within the subset to determine the best encoding state as the most likely initial encoding state for the tailbiting convolutional code. A Trellis path of this most likely initial encoding state is utilized to decode the tailbiting convolutional code.

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