Gradient Estimation for Sensitivity Analysis and Adaptive Multiuse Interface Rejection in Code-division Multiple-access Systems

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dc.citation.bibtexNamearticleen_US
dc.citation.firstpage848en_US
dc.citation.journalTitleIEEE Transactions on Communicationsen_US
dc.citation.lastpage858en_US
dc.citation.volumeNumber45en_US
dc.contributor.authorMandayam, Narayan B.en_US
dc.contributor.authorAazhang, Behnaamen_US
dc.contributor.orgCenter for Multimedia Communications (http://cmc.rice.edu/)en_US
dc.date.accessioned2007-10-31T00:52:42Zen_US
dc.date.available2007-10-31T00:52:42Zen_US
dc.date.issued1997-07-20en_US
dc.date.modified2001-10-10en_US
dc.date.submitted2001-10-10en_US
dc.descriptionJournal Paperen_US
dc.description.abstractIn this paper, we consider a direct-sequence code-division multiple-access (DS-CDMA) system in the framework of a discrete-event dynamic system (DEDS) in order to optimize the system performance. Based on this formulation, we develop infinitesimal perturbation analysis (IPA) for estimating the sensitivity of the average probability of bit error to factors ranging from near-far effects to imperfections in power control. The above estimates are shown to be unbiased, and this technique is then further incorporated into a stochastic gradient algorithm for achieving adaptive multiuser interference rejection for such systems, which is also subject to frequency nonselective slow fading. We use an IPA-based stochastic training algorithm for developing an adaptive linear detector with the average probability of error being the minimization criterion. We also develop a practical implementation of such an adaptive detector where we use a joint estimation-detection algorithm for minimizing the average probability of bit error. A sequential implementation that does not require a stochastic training sequence or a preamble is also developed.en_US
dc.identifier.citationN. B. Mandayam and B. Aazhang, "Gradient Estimation for Sensitivity Analysis and Adaptive Multiuse Interface Rejection in Code-division Multiple-access Systems," <i>IEEE Transactions on Communications,</i> vol. 45, 1997.en_US
dc.identifier.doihttp://dx.doi.org/10.1109/26.602590en_US
dc.identifier.urihttps://hdl.handle.net/1911/20082en_US
dc.language.isoengen_US
dc.subjectadaptive detectionen_US
dc.subjectdirect-sequence CDMAen_US
dc.subjectinfinitesimal perturbation analysisen_US
dc.subjectstochastic gradient algorithmen_US
dc.subject.keywordadaptive detectionen_US
dc.subject.keyworddirect-sequence CDMAen_US
dc.subject.keywordinfinitesimal perturbation analysisen_US
dc.subject.keywordstochastic gradient algorithmen_US
dc.titleGradient Estimation for Sensitivity Analysis and Adaptive Multiuse Interface Rejection in Code-division Multiple-access Systemsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
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