Modified Structures of Viterbi Alogrithm for Forced-State Method in Concatenated Coding System of ISDB-T
Iterative decoding based on forced-state method is applied for improving the decoding performance for concatenated coding system. In the application targeted here, this iterative decoding method is proposed for channel decoding of Japan Terrestrial Digital TV (ISDB-T). Modified structure of Viterbi algorithm that operates on quantized data with regard to implementation of the iterative decoding is presented. In general, knowledge about the implementation of conventional Viterbi algorithm can be applied to the modified Viterbi algorithm. The computational kernel of the proposed structure is the path metric calculation and the trace back for Viterbi algorithm with forced-state method based on quantized data.
KeywordsISDB-T Concatenated coding Convolutional codes Reed-Solomon codes Viterbi algortihm BM algorithm forced-state decoding
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