A novel approach for approximating the max* operator, used in the Log-MAP decoding algorithm, is presented. In this approximation it is not necessary to use any additional correction term, as previous approximation methods require. Several decoding algorithms are obtained for both turbo and turbo trellis-coded modulation (TTCM) codes with optimal and near-optimal bit error rate (BER) performance depending on a single parameter, namely the number of piecewise-linear (PWL) approximation terms used. The decoding complexity is estimated, showing the practical implementation advantages of the proposed method against the Log-MAP algorithm.
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