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The Haroutunian exponent arises in the study of channel reliability functions for both block coding with feedback and fixed-delay coding without feedback. For asymmetric channels, such as the $Z$ -channel, the Haroutunian exponent is strictly larger than the sphere-packing exponent. The sphere-packing exponent is believed to be an upper bound for the reliability function in the two aforementioned...
The issue of whether feedback can significantly increase reliability in the fixed-length channel code setting is further investigated. This paper considers the problem of error exponents for block codes with noiseless, delayed feedback used over discrete memoryless channels (DMCs) - including asymmetric channels with and without zeros in their transition matrix. We show that when output feedback is...
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