Performance Analysis of Emerging Solutions to RF Spectrum Scarcity Problem in Wireless Communications

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dc.contributor.authorUsman, Muneer
dc.contributor.supervisorYang, Hong-Chuan
dc.date.accessioned2014-10-29T15:05:12Z
dc.date.available2014-10-29T15:05:12Z
dc.date.copyright2014en_US
dc.date.issued2014-10-29
dc.degree.departmentDepartment of Electrical and Computer Engineering
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractWireless communication is facing an increasingly severe spectrum scarcity problem. Hybrid free space optical (FSO)/ millimetre wavelength (MMW) radio frequency (RF) systems and cognitive radios are two candidate solutions. Hybrid FSO/RF can achieve high data rate transmission for wireless back haul. Cognitive radio transceivers can opportunistically access the underutilized spectrum resource of existing systems for new wireless services. In this work we carry out accurate performance analysis on these two transmission techniques. In particular, we present and analyze a switching based transmission scheme for a hybrid FSO/RF system. Specifically, either the FSO or RF link will be active at a certain time instance, with the FSO link enjoying a higher priority. We consider both a single threshold case and a dual threshold case for FSO link operation. Analytical expressions are obtained for the outage probability, average bit error rate and ergodic capacity for the resulting system. We also investigate the delay performance of secondary cognitive transmission with interweave implementation. We first derive the exact statistics of the extended delivery time, that includes both transmission time and waiting time, for a fixed-size secondary packet. Both work-preserving strategy (i.e. interrupted packets will resume transmission from where interrupted) and non-work-preserving strategy (i.e. interrupted packets will be retransmitted) are considered with various sensing schemes. Finally, we consider a M/G/1 queue set-up at the secondary user and derive the closed-form expressions for the expected delay with Poisson traffic. The analytical results will greatly facilitate the design of the secondary system for particular target application.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/5713
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectHydrid FSO/RFen_US
dc.subjectFree-space optical communicationen_US
dc.subjectRadio frequencyen_US
dc.subjectPerformance analysisen_US
dc.subjectCognitive radioen_US
dc.subjectspectrum accessen_US
dc.subjectsingle-channel sensingen_US
dc.subjecttraffic modelen_US
dc.subjectprimary useren_US
dc.subjectsecondary useren_US
dc.subjectM/G/1 Queueen_US
dc.titlePerformance Analysis of Emerging Solutions to RF Spectrum Scarcity Problem in Wireless Communicationsen_US
dc.typeThesisen_US

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