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dc.contributor.advisorSalt, J. Ericen_US
dc.creatorAlijan, Mehdien_US
dc.date.accessioned2010-04-05T16:42:40Zen_US
dc.date.accessioned2013-01-04T04:28:14Z
dc.date.available2011-04-16T08:00:00Zen_US
dc.date.available2013-01-04T04:28:14Z
dc.date.created2010-04en_US
dc.date.issued2010-04-16en_US
dc.date.submittedApril 2010en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-04052010-164240en_US
dc.description.abstractThere is a growing demand for the high quality TV programs such as High Definition TV (HDTV). The CATV network is often a suitable solution to address this demand using a CATV modem delivering high data rate digital signals in a cost effective manner, thereby, utilizing a complex digital modulation scheme is inevitable. Exploiting complex modulation schemes, entails a more sophisticated modulator and distribution system with much tighter tolerances. However, there are always distortions introduced to the modulated signal in the modulator degrading signal quality. In this research, the effect of distortions introduced by the RF band pass filter in the modulator will be considered which cause degradations on the quality of the output Quadrature Amplitude Modulated (QAM) signal. Since the RF filter's amplitude/group delay distortions are not symmetrical in the frequency domain, once translated into the base band they have a complex effect on the QAM signal. Using Matlab, the degradation effects of these distortions on the QAM signal such as Bit Error Rate (BER) is investigated. In order to compensate for the effects of the RF filter distortions, two different methods are proposed. In the first method, a complex base band compensation filter is placed after the pulse shaping filter (SRRC). The coefficients of this complex filter are determined using an optimization algorithm developed during this research. The second approach, uses a pre-equalizer in the form of a Feed Forward FIR structure placed before the pulse shaping filter (SRRC). The coefficients of this pre-equalizer are determined using the equalization algorithm employed in a test receiver, with its tap weights generating the inverse response of the RF filter. The compensation of RF filter distortions in base band, in turn, improves the QAM signal parameters such as Modulation Error Ratio (MER). Finally, the MER of the modulated QAM signal before and after the base band compensation is compared between the two methods, showing a significant enhancement in the RF modulator performance.en_US
dc.language.isoen_USen_US
dc.subjectAmplitude distortionen_US
dc.subjectEqualizationen_US
dc.subjectFIRen_US
dc.subjectIIRen_US
dc.subjectQuasi Newton Algorithmen_US
dc.subjectOptimizationen_US
dc.subjectCATVen_US
dc.subjectDSPen_US
dc.subjectDOCSISen_US
dc.subjectRF filteren_US
dc.subjectSRRCen_US
dc.subjectBERen_US
dc.subjectModulatoren_US
dc.subjectQAMen_US
dc.subjectConjugate symmetryen_US
dc.subjectMSEen_US
dc.subjectLMSen_US
dc.subjectMERen_US
dc.subjectComplex distortionen_US
dc.subjectGroup Delay distortionen_US
dc.titleDSP compensation for distortion in RF filtersen_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberHanson, J.en_US
dc.contributor.committeeMemberDaku, B.en_US
dc.contributor.committeeMemberKlymyshyn, D.en_US
dc.contributor.committeeMemberLynch, D.en_US


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