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dc.contributor.advisorRomero, Ric A.
dc.contributor.advisorHa, Tri T.
dc.contributor.advisorSu, Weilian
dc.contributor.authorAhn, Byunghyun
dc.dateDec-13
dc.date.accessioned2016-03-03T23:26:28Z
dc.date.available2016-03-03T23:26:28Z
dc.date.issued2013-12
dc.identifier.urihttp://hdl.handle.net/10945/48119
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractIn this thesis, the effect of Doppler shift on adaptive orthogonal frequency-division multiplex (OFDM) modulation in a cognitive radio (CR) application is investigated. We present Monte Carlo simulations of OFDM modulation in which a group or groups of subcarriers are modulated using quadrature phase-shift keying (QPSK) modulation and 16-ary quadrature amplitude modulations (16QAM). We show that turning off some subcarriers does not affect the performance as long as the effective Eb/No remains the same. We also present Monte Carlo simulations where the power ratio of two sets of subcarriers is changed while maintaining the same total power in order to investigate the effect on performance. Finally, we consider a two-user CR scenario and investigate the performance effect on a primary user by a secondary user in terms of various Doppler shift offsets where both the primary user and secondary user use OFDM modulations.en_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.rightsCopyright is reserved by the copyright owner.en_US
dc.titleEffect of Doppler shift on adaptive OFDM modulation for cognitive radio applicationen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineering
dc.subject.authorCognitive Radio (CR)en_US
dc.subject.authorSignal-to-Noise Ratio (SNR)en_US
dc.subject.authorSignal-to-Interference Ratio (SIR)en_US
dc.subject.authorAdaptive Orthogonal Frequency Division Multiplexing (AOFDM)en_US
dc.subject.authorFrequency Offseten_US
dc.subject.authorDoppler shiften_US
dc.subject.authorQuadrature Phase Shift Keying (QPSK)en_US
dc.subject.authorQuadrature Amplitude Modulations (QAM)en_US
dc.subject.authorSubcarrier Allocation Schemeen_US
dc.description.serviceLieutenant, Republic of Korea Navyen_US
etd.thesisdegree.nameMaster of Science in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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