On Reliability Functions for Single-Message Unequal Error Protection
Single-message Unequal Error Protection (UEP) is a channel coding scheme that protects one special message differently from other (regular) messages. This induces three different types of errors in the system: miss (where the authors decode the special codeword as a regular codeword), false alarm (where they decode a regular codeword as the special codeword), and decoding error (where they decode a regular codeword to another regular codeword). In this paper, they investigate the fundamental limits of single-message UEP, in the context of Discrete Memoryless Channels (DMCs) without feedback. Similar to Borade et al., they use error exponents as the performance metric, and discuss maximizing the miss error exponent and the false alarm error exponent, respectively.