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dc.contributor.advisorHa, Tri T.
dc.contributor.advisorBorden, Brett H.
dc.contributor.authorSegkos, Michail
dc.dateJune 2004
dc.date.accessioned2012-03-14T17:32:08Z
dc.date.available2012-03-14T17:32:08Z
dc.date.issued2004-06
dc.identifier.urihttp://hdl.handle.net/10945/1514
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractOFDM systems have experienced increased attention in recent years and have found applications in a number of diverse areas including telephone-line based ADSL links, digital audio and video broadcasting systems, and wireless local area networks (WLAN). Orthogonal frequency-division multiplexing (OFDM) is a powerful technique for high data-rate transmission over fading channels. However, to deploy OFDM in a WLAN environment, precise frequency synchronization must be maintained and tricky frequency offsets must be handled. In this thesis, various techniques to improve the data throughput of OFDM WLAN are investigated. A simulation tool was developed in Matlab to evaluate the performance of the IEEE 802.11a physical layer. We proposed a rapid time and frequency synchronization algorithm using only the short training sequence of the IEEE 802.11a standard, thus reducing the training overhead to 50%. Particular attention was paid to channel coding, block interleaving and antenna diversity. Computer simulation showed that drastic improvement in error rate performance is achievable when these techniques are deployed.en_US
dc.description.urihttp://archive.org/details/advancedtechniqu109451514
dc.format.extentxxii, 111 p. : ill. (some col.) ;en_US
dc.publisherMonterey California. Naval Postgraduate Schoolen_US
dc.rightsCopyright is reserved by the copyright owneren_US
dc.subject.lcshWireless LANsen_US
dc.subject.lcshMultiplexingen_US
dc.titleAdvanced techniques to improve the performance of OFDM Wireless LANen_US
dc.typeThesisen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentDepartment of Electrical Engineering
dc.contributor.departmentDepartment of Physics
dc.subject.authorOFDMen_US
dc.subject.authorWLANen_US
dc.subject.authorIEEE 802.11aen_US
dc.subject.authorExponential channel modelen_US
dc.subject.authorPacket detectionen_US
dc.subject.authorFrame synchronizationen_US
dc.subject.authorFrequency synchronizationen_US
dc.subject.authorCarrier offseten_US
dc.subject.authorPhase noiseen_US
dc.subject.authorPilot phase trackingen_US
dc.subject.authorChannel estimationen_US
dc.subject.authorEqualizationen_US
dc.subject.authorScramblingen_US
dc.subject.authorConvolutional codingen_US
dc.subject.authorInterleavingen_US
dc.subject.authorMaximal ratio combiningen_US
dc.subject.authorSelection diversityen_US
dc.subject.authorViterbi algorithmen_US
dc.subject.authorSoft decision decodingen_US
dc.subject.authorPuncturingen_US
dc.description.serviceLieutenant, Hellenic Navyen_US
dc.identifier.oclc56088774
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.nameM.S. in Applied Physicsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.disciplineApplied Physicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
etd.verifiednoen_US


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