Optimal randomization of signal constellations on downlink of a multiuser DS-CDMA system

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buir.contributor.authorArıkan, Orhan
buir.contributor.authorGezici, Sinan
buir.contributor.orcidArıkan, Orhan|0000-0002-3698-8888
dc.citation.epage4891en_US
dc.citation.issueNumber10en_US
dc.citation.spage4878en_US
dc.citation.volumeNumber12en_US
dc.contributor.authorTutay, M. E.en_US
dc.contributor.authorGezici, Sinanen_US
dc.contributor.authorArıkan, Orhanen_US
dc.date.accessioned2015-07-28T12:00:55Z
dc.date.available2015-07-28T12:00:55Z
dc.date.issued2013-10en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractIn this study, the jointly optimal power control with signal constellation randomization is proposed for the downlink of a multiuser communications system. Unlike a conventional system in which a fixed signal constellation is employed for all the bits of a user (for given channel conditions and noise power), power control with signal constellation randomization involves randomization/time- sharing among different signal constellations for each user. A formulation is obtained for the problem of optimal power control with signal constellation randomization, and it is shown that the optimal solution can be represented by a randomization among (K+1) or fewer distinct signal constellations for each user, where K denotes the number of users. In addition to the original nonconvex formulation, an approximate solution based on convex relaxation is derived. Then, detailed performance analysis is presented when the receivers employ symmetric signaling and sign detectors. Specifically, the maximum asymptotical improvement ratio is shown to be equal to the number of users, and the conditions under which the maximum and minimum asymptotical improvement ratios are achieved are derived. Numerical examples are presented to investigate the theoretical results, and to illustrate performance improvements achieved via the proposed approach. © 2002-2012 IEEE.en_US
dc.identifier.doi10.1109/TW.2013.081413.121418en_US
dc.identifier.issn1536-1276
dc.identifier.urihttp://hdl.handle.net/11693/12285
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TW.2013.081413.121418en_US
dc.source.titleIEEE Trans on Wireless Communicationsen_US
dc.subjectDownlinken_US
dc.subjectMinimaxen_US
dc.subjectMultiuseren_US
dc.subjectProbability Of Erroren_US
dc.subjectRandomizationen_US
dc.subjectTime-sharingen_US
dc.titleOptimal randomization of signal constellations on downlink of a multiuser DS-CDMA systemen_US
dc.typeArticleen_US

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