Adaptive digital predistortion for linearization of power amplifier

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buir.advisorAtalar, Abdullah
dc.contributor.authorŞekerlisoy, Burak
dc.date.accessioned2016-01-08T18:10:09Z
dc.date.available2016-01-08T18:10:09Z
dc.date.issued2009
dc.descriptionAnkara : The Department of Electrical and electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical references leaves 55.en_US
dc.description.abstractIn most communication systems, power amplifiers are used to obtain high output power. The nonlinear characteristics of the power amplifier leads to the distortion of the output signal. This distortion affects the efficiency of the power amplifier. The way to reduce this effect is to linearize the power amplifier near the saturation region where it is nonlinear. The widely used technique for the linearization of power amplifiers is predistortion. The proposed technique for predistortion uses a LUT(look-up-table), a complex multiplier, an address calculator, delay elements and an adaptation logic. A new adaptation logic to update the LUT coefficients, is used. The predistorter is simulated in Matlab software using a baseband model for the power amplifier. 16-QAM baseband modulation is used to simulate the predistorter. In order to see the performance of the proposed predistorter, hardware logic is implemented in FPGA and experimental setup with RF circuits and RF power amplifier is used. For different LUT sizes, the algorithm is tested and for the LUT size of 64, nearly 15 dB improvement in power spectrum is observed. The LUT size of 64 is observed to be the optimal LUT size in the experiments.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:10:09Z (GMT). No. of bitstreams: 1 0003823.pdf: 12599045 bytes, checksum: 77c38fdbfea4f8c6017fd14dab050f30 (MD5)en
dc.description.statementofresponsibilityŞekerlisoy, Buraken_US
dc.format.extentxi, 55 leaves, tables and graphsen_US
dc.identifier.itemidBILKUTUPB116725
dc.identifier.urihttp://hdl.handle.net/11693/14876
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectAdaptive Digital Predistortionen_US
dc.subjectLook-up Table Predistortionen_US
dc.subjectLinearizationen_US
dc.subjectAmplifier Nonlinearityen_US
dc.subjectFPGAen_US
dc.subject.lccT57.8 .S45 2009en_US
dc.subject.lcshNonlinear programming.en_US
dc.subject.lcshPower amplifiers.en_US
dc.titleAdaptive digital predistortion for linearization of power amplifieren_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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