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On memory redundancy in the BCJR algorithm for nonrecursive shift register processes

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2 Author(s)
Schmidt, M. ; Tech. Univ. Dresden, Germany ; Fettweis, G.P.

For computation of a posteriori probabilities (APPs), the well-known Bahl, Cocke, Jelinek, and Raviv (1974) algorithm is often applied. If the underlying model is a nonrecursive shift register process, it is shown that this algorithm obtains a general memory redundancy if the computation is performed over a commutative semiring with an absorbing zero element. The result is of particular interest for the BCJR algorithm carried out in the max-log domain

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Information Theory, IEEE Transactions on  (Volume:46 ,  Issue: 4 )