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A Simplification of the Modified Bahl Decoding Algorithm for Systematic Convolutional Codes

A soft-in/soft-out algorithm which estimates the a posteriori probabilities (APP) for each transmitted bit is investigated. The soft outputs can be used at the next decoding stage, which could be an outer code or another iteration in an iterative decoding process. This algorithm is estimated to have approximately four times the complexity of the Viterbi algorithm and has the advantage of providing the APP for each decoded bit.