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The capacity of the arbitrarily varying channel revisited: positivity, constraints

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2 Author(s)
Csiszar, I. ; Math. Inst., Hungarian Acad. of Sci., Budapest, Hungary ; Narayan, P.

A well-known result of R. Ahlswede (1970) asserts that the deterministic code capacity of an arbitrarily varying channel (AVC), under the average-error-probability criterion, either equals its random code capacity or else is zero. A necessary and sufficient condition is identified for deciding between these alternative, namely, the capacity is zero if and only if the AVC is symmetrizable. The capacity of the AVC is determined with constraints on the transmitted codewords as well as on the channel state sequences, and it is demonstrated that it may be positive but less than the corresponding random code capacity. A special case of the results resolves a weakened version of a fundamental problem of coding theory

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Information Theory, IEEE Transactions on  (Volume:34 ,  Issue: 2 )