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dc.contributor.advisorHa, Tri T.
dc.contributor.advisorLebaric, Jovan
dc.contributor.authorNg, Stewart Siew Loon
dc.date.accessioned2012-03-14T17:30:31Z
dc.date.available2012-03-14T17:30:31Z
dc.date.issued2003-03
dc.description.abstractThis thesis examines a circular adaptive antenna array used at the mobile station for a typical Direct Sequence Code Division Multiple Access (DS-CDMA) cellular mobile communications system. The primary objective is to reduce co-channel interference of a wideband CDMA cellular network under a multi-path fading environment. We analyzed the performance of a randomly positioned mobile terminal with a randomly orientated adaptive antenna array in the forward channel (base-station to mobile) of a multi-cell DS-CDMA system and established four performance boundaries. A single complex circular adaptive weight in each element channel of a circular adaptive array sufficiently processes narrowband signals. However, in order to process broadband signals, a tapped-delay line (transveral filter) is required. This tapped-delay line is employed because it can adjust the frequency dependent amplitude and phase. The performance of a DS-CDMA cellular system with a mobile terminal equipped with a circular array and a tapped-delay line is analyzed. It has been demonstrated that the optimization process has been extremely computationally expensive and hence minimum taps should be used for practical considerations. The results illustrated that, in general, for a four-element circular array system, a two tapped-delay line would be sufficient to equalize the broadband signal while providing a similar performance level to that of a narrow-band adaptive array system.en_US
dc.description.urihttp://archive.org/details/smartntennindscd109451080
dc.format.extentxx, 79 p. : ill. (some col.) ;en_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsCopyright is reserved by the copyright owner.en_US
dc.subject.lcshAntennas (Electronics)en_US
dc.subject.lcshCode division multiple accessen_US
dc.subject.lcshMobile communication systemsen_US
dc.titleSmart antenna in DS-CDMA mobile communication system using circular array techniqueen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical Engineering
dc.description.serviceMajor, Republic of Singapore Air Forceen_US
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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