Empirical detection for spread spectrum and code division multiple access (CDMA) communications

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dc.contributor.advisorJohnson, Don H.en_US
dc.creatorLee, Yuan Kangen_US
dc.date.accessioned2009-06-04T08:13:15Zen_US
dc.date.available2009-06-04T08:13:15Zen_US
dc.date.issued1998en_US
dc.description.abstractIn this thesis, the method of "classification with empirically observed statistics"--also known as empirical classification, empirical detection, universal classification, and type-based detection--is configured and applied to the despreading/detection receiver operation of a spread-spectrum (SS), code division multiple access (CDMA) communications system. In static and Rayleigh-fading environments, the empirical detector is capable of adapting to unknown noise environments in a superior manner than the linear matched-filter despreader/detector, and done with reasonable amounts of training. Compared to the optimum detector, when known, the empirical detector always approaches optimal performance, again, with reasonable amounts of training. In an interference-limited channel, we show that the single-user likelihood-ratio detector, which is the optimum single-user detector, can greatly outperform the matched filter in certain imperfect power-control situations. The near optimality of the empirical detector implies that it, too, will outperform the matched filter in these situations. Although the empirical detector has the added cost of requiring chip-based phase synchronization, its consistent and superior performance in all environments strongly suggests its application in lieu of the linear detector for SS/CDMA systems employing long, pseudo-random spreading. In order to apply empirical classification to digital communications, we derive the empirical forced-decision detector and show that it is asymptotically optimal over a large class of empirical classifiers.en_US
dc.format.extent147 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS E.E. 1998 LEEen_US
dc.identifier.citationLee, Yuan Kang. "Empirical detection for spread spectrum and code division multiple access (CDMA) communications." (1998) Diss., Rice University. <a href="https://hdl.handle.net/1911/19280">https://hdl.handle.net/1911/19280</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/19280en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectStatisticsen_US
dc.subjectElectronicsen_US
dc.subjectElectrical engineeringen_US
dc.titleEmpirical detection for spread spectrum and code division multiple access (CDMA) communicationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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