Bondaschi, MarcoFabregas, Albert Guillen, IDalai, Marco2022-03-142022-03-142022-03-142022-03-0110.1109/TIT.2021.3131646https://infoscience.epfl.ch/handle/20.500.14299/186363WOS:000757850700009We derive an upper bound on the reliability function of mismatched decoding for zero-rate codes. The bound is based on a result by Komlos that shows the existence of a subcode with certain symmetry properties. The bound is shown to coincide with the expurgated exponent at rate zero for a broad family of channel-decoding metric pairs.Computer Science, Information SystemsEngineering, Electrical & ElectronicComputer ScienceEngineeringdecodingmeasurementreliabilityupper boundcapacity planningcodesrandom variableserror exponentsmismatched decodinginformation ratesexponentscapacitytext::journal::journal article::research article