Bondaschi, MarcoGuillen i Fabregas, AlbertDalai, Marco2021-11-062021-11-062021-11-062021-01-0110.1109/ISIT45174.2021.9517804https://infoscience.epfl.ch/handle/20.500.14299/182860WOS:000701502201039We 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 and decoding metric pairs.A full version of this paper is accessible at: https://arxiv.org/pdf/2101.10238.pdfComputer Science, Theory & MethodsEngineering, Electrical & ElectronicComputer ScienceEngineeringinformation ratesexponentstext::conference output::conference proceedings::conference paper