CUED Publications database

Multiuser Random Coding Techniques for Mismatched Decoding

Scarlett, J and Martinez, A and Guillen Fabregas, A (2016) Multiuser Random Coding Techniques for Mismatched Decoding. IEEE Transactions on Information Theory, 62. pp. 3950-3970. ISSN 0018-9448

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© 2016 IEEE. This paper studies multiuser random coding techniques for channel coding with a given (possibly suboptimal) decoding rule. For the mismatched discrete memoryless multiple-access channel, an error exponent is obtained that is tight with respect to the ensemble average, and positive within the interior of Lapidoth's achievable rate region. This exponent proves the ensemble tightness of the exponent of Liu and Hughes in the case of maximum-likelihood decoding. An equivalent dual form of Lapidoth's achievable rate region is given, and the latter is shown to immediately extend to channels with infinite and continuous alphabets. In the setting of single-user mismatched decoding, similar analysis techniques are applied to a refined version of superposition coding, which is shown to achieve rates at least as high as standard superposition coding for any set of random-coding parameters.

Item Type: Article
Uncontrolled Keywords: Mismatched decoding multiple-access channel superposition coding random coding error exponents ensemble tightness Lagrange duality maximum-likelihood decoding
Divisions: Div F > Signal Processing and Communications
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:56
Last Modified: 07 Mar 2019 14:31
DOI: 10.1109/TIT.2016.2555317