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On hybrid stack decoding algorithms for block codes

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2 Author(s)
Hguado, L.E. ; Commun. Res. Group, Manchester Univ., UK ; Farrell, P.G.

This correspondence presents sequential algorithms for soft decision decoding of linear block codes. They use a stack algorithm based on the trellis of the code. We are interested in the trellis as a means to avoid path-decoding repetitions. As well, the possibility of bidirectional decoding offers a chance to increase the likelihood of explored paths. We have developed three successive algorithms that offer a good decrement in the overall complexity, and mainly in the most complex decoding case, while giving near-maximum-likelihood performance. This is important since it determines the maximum buffer size necessary in the decoder

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Information Theory, IEEE Transactions on  (Volume:44 ,  Issue: 1 )