Class-Based Expurgation Attains Csiszár's Expurgated Source-Channel Exponent

Published 4 Jul 2025 in cs.IT, math.IT, and math.PR | (2507.03481v1)

Abstract: This paper studies expurgated error exponents for joint source-channel coding for discrete memoryless sources and channels. We consider a partition of the source messages into classes, where the codeword distributions depend on the class. We show that two carefully chosen classes suffice to achieve Csisz\'ar's expurgated exponent.

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