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dc.contributor.authorQaraqe, Khalid A.
dc.contributor.authorBouida, Zied
dc.contributor.authorAbdallah, Mohamed M.
dc.contributor.authorAlouini, Mohamed-Slim
dc.date.accessioned2015-08-04T06:24:22Z
dc.date.available2015-08-04T06:24:22Z
dc.date.issued2011
dc.identifier.isbn9781936968190
dc.identifier.doi10.4108/icst.crowncom.2011.246248
dc.identifier.urihttp://hdl.handle.net/10754/564345
dc.description.abstractUnder the scenario of an underlay cognitive radio network, we propose in this paper an adaptive scheme using switched transmit diversity and adaptive modulation in order to minimize the average number of switched branches at the secondary transmitter while increasing the capacity of the secondary link. The proposed switching efficient scheme (SES) uses the scan and wait (SWC) combining technique where a transmission occurs only when a branch with an acceptable performance is found, otherwise data is buffered. In our scheme, the modulation constellation size and the used transmit branch are determined to achieve the highest spectral efficiency with a minimum processing power, given the fading channel conditions, the required error rate performance, and a peak interference constraint to the primary receiver. Selected numerical examples show that the SES scheme minimizes the average number of switched branches for the average and the high secondary signal-to-noise ratio range. This improvement comes at the expense of a small delay introduced by the SWC technique. For reference, we also compare the performance of the SES scheme to the selection diversity scheme (SDS) where the best branch verifying the modulation mode and the interference constraint is always selected. © 2011 ICST.
dc.publisherEuropean Alliance for Innovation n.o.
dc.subjectAdaptive Modulation
dc.subjectPerformance Analysis
dc.subjectSpectrum Sharing
dc.subjectSwitched Diversity
dc.titleJoint switched transmit diversity and adaptive modulation in spectrum sharing systems
dc.typeConference Paper
dc.contributor.departmentCommunication Theory Lab
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalProceedings of the 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications
dc.conference.date1 June 2011 through 3 June 2011
dc.conference.name2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011
dc.conference.locationOsaka
dc.contributor.institutionDepartment of Electrical and Computer Engineering, Texas A and M University at Qatar, Doha, Qatar
kaust.personAlouini, Mohamed-Slim


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