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dc.contributor.advisorAtalar, Abdullah
dc.contributor.authorAslan, Makbule Pehlivan
dc.date.accessioned2016-01-08T18:08:59Z
dc.date.available2016-01-08T18:08:59Z
dc.date.issued2008
dc.identifier.urihttp://hdl.handle.net/11693/14828
dc.descriptionAnkara : The Department of Electrical and electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2008.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2008.en_US
dc.descriptionIncludes bibliographical references leaves 75-77.en_US
dc.description.abstractHigh power amplification of linear modulation schemes which exhibit fluctuating envelopes, invariably leads to the generation of distortion and intermodulation products. In order to avoid these effects, maintaining both power and spectral efficiency, it is necessary to use linearization techniques. By using linearization techniques, the amplifier can be operated near the saturation with good efficiency and linearity. The technique proposed here is predistortion based on a look-up table (LUT) method using input and output signal envelopes. The predistortion is implemented using a LUT and an address generation block that selects the appropriate coefficient from the LUT, given the magnitude of the input signal. The testing of the predistorter is done by using a baseband system model which consists of a 16-QAM modulator, an upsampler, a raised cosine filter, the predistorter and a baseband behavioural amplifier model. The performance of the predistorter with a new LUT update method is evaluated in terms of power efficiency and spectrum efficiency. MATLAB simulations show that to obtain up to 25-30 dB improvement in power spectrum is possible and sufficiently large LUT size is needed to reduce the background noise level. Furthermore, the performance of the predistorter in the case of an amplifier with memory is also investigated. The algorithms have been implemented on an FPGA chip. The performance of the system is as predicted in MATLAB simulations.en_US
dc.description.statementofresponsibilityAslan, Makbule Pehlivanen_US
dc.format.extentxii, 77 leaves, tables and graphsen_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectAptive Digital Predistortionen_US
dc.subjectLook-up Table Predistortionen_US
dc.subjectLinearizationen_US
dc.subjectAmplifier Nonlinearityen_US
dc.subjectSpectrum Efficiencyen_US
dc.subjectFPGAen_US
dc.subject.lccT57.8 .A85 2008en_US
dc.subject.lcshNonlinear programming.en_US
dc.subject.lcshPower amplifiers.en_US
dc.titleAdaptive digital predistortion for power amplifier linearizationen_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US
dc.identifier.itemidBILKUTUPB111780


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