An information-theoretic framework for unequal error protection is developed in terms of the exponential error bounds. The fundamental difference between the bit-wise and message-wise unequal error protection ( UEP) is demonstrated, for fixed-length block codes on discrete memoryless channels (DMCs) without feedback. Effect of feedback is investigated via variable-length block codes. It is shown that, feedback results in a significant improvement in both bit-wise and message-wise UEPs (except the single message case for missed detection). The distinction between false-alarm and missed-detection formalizations for message-wise UEP is also considered. All results presented are at rates close to capacity. Index Terms-Block codes, blowing-up lemma, error exponents, false alarm, feedback, missed detection, unequal error protection (UEP), variable-length block coding.
In REF , Borade, Nakiboglu, and Zheng study "bit"-wise and "message"-wise unequal error protection (UEP) problems and error exponents.
Unequal Error Protection: An Information-Theoretic Perspective
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Computer Science Mathematics