Optimization of Soft Interference Cancellation in DS-CDMA Receivers

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dc.contributor.authorRenucci, Pascal G.en
dc.contributor.committeechairWoerner, Brian D.en
dc.contributor.committeememberBostian, Charles W.en
dc.contributor.committeememberRappaport, Theodore S.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:51:30Zen
dc.date.adate1998-06-18en
dc.date.available2014-03-14T20:51:30Zen
dc.date.issued1998-05-22en
dc.date.rdate1998-06-18en
dc.date.sdate1998-05-22en
dc.description.abstractParallel interference cancellation for DS-CDMA has been shown to suffer from biased amplitude estimates if a matched-filter estimator is used. The bias magnitude is proportional to the number of interfering users. For heavy system loads, the bias has been shown to adversely effect the accuracy of the interference cancellation process, thereby impairing BER after cancellation. Empirical simulation work has demonstrated that weighting down interference estimates can improve BER performance. This thesis substantiates these BER improvements by modelling and analyzing a soft interference cancellation technique which mitigates the effects of the bias by minimizing BER after cancellation in a bit-synchronous parallel interference cancellation CDMA receiver. We analyze system decision metrics with down-scaled interference estimates and determine both the mean and variance of the biased decision statistics. From these two metric moments, system BER is evaluated, and the optimal interference scaling function which minimizes BER is derived. We demonstrate BER performance enhancements by simulating this soft interference cancellation technique in systems under perfect power control and in the near-far situation. We further discuss the applicability of the results to asynchronous systems.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-42598-1795en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-42598-1795/en
dc.identifier.urihttp://hdl.handle.net/10919/36700en
dc.publisherVirginia Techen
dc.relation.haspartrenucci.pdfen
dc.relation.haspartrenucci.pdf.olden
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcode division multiple accessen
dc.subjectmultiuser receiversen
dc.subjectinterference cancellationen
dc.subjectspread spectrum communicationsen
dc.subjectmobile radioen
dc.titleOptimization of Soft Interference Cancellation in DS-CDMA Receiversen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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