Biglieri, EzioGrossi, EmanueleLops, MarcoTauste Campo, Adrià, 1982-2013-03-112013-03-112008Biglieri E, Grossi E, Lops M, Tauste-Campo A. Large-system analysis of a CDMA dynamic channel under a Markovian input process. In: Proceedings of the 2008 IEEE International Symposium on Information Theory (ISIT '08); 2008 Jul 6-11; Toronto, Ontario, Canada. [New York]: IEEE; c2008. p.1793-1797. DOI 10.1109/ISIT.2008.45952970271-4655http://hdl.handle.net/10230/20478Comunicació presentada al IEEE International Symposium on Information Theory (ISIT '08), celebrat a Toronto (Ontario, Canadà) els dies 6, 7, 8, 9, 10 i 11 de juliol de 2008, organitzat per l'Institute of Electrical and Electronics Engineers (IEEE).We study the minimum mean square error (MMSE) and the multiuser efficiency η of large dynamic multiple access communication systems in which optimal multiuser detection is performed at the receiver as the number and the identities of active users is allowed to change at each transmission time. The system dynamics are ruled by a Markov model describing the evolution of the channel occupancy and a large-system analysis is performed when the number of observations grow large. Starting on the equivalent scalar channel and the fixed-point equation tying multiuser efficiency and MMSE, we extend it to the case of a dynamic channel, and derive lower and upper bounds for the MMSE (and, thus, for η as well) holding true in the limit of large signal–to–noise ratios and increasingly large observation time T.application/pdfeng© 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works./nThe final published article can be found at http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4595297Comunicacions mòbils, Sistemes deProcessos de MarkovAccés múltiple per divisió de codiinfo:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1109/ISIT.2008.4595297info:eu-repo/semantics/openAccess