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dc.contributor.advisorLi, Geoffrey Ye
dc.contributor.authorLu, Lu
dc.date.accessioned2015-09-21T14:25:33Z
dc.date.available2015-09-21T14:25:33Z
dc.date.created2015-08
dc.date.issued2015-06-12
dc.date.submittedAugust 2015
dc.identifier.urihttp://hdl.handle.net/1853/53902
dc.description.abstractWe investigate spectral-efficient design and develop novel schemes to improve spectral efficiency of the modern wireless communications networks. Nowadays, more and more spectrum resources are required to support various high-data-rate applications while spectrum resources are limited. Moreover, static allocation and exclusive access in current spectrum assignment policy caused a lot of licensed spectrum bands to be underutilized. To deal with the problem, cognitive radio (CR) has been developed, which allows unlicensed/secondary users to transmit with licensed/primary users as long as the former ones do not generate intolerable interference to the latter ones. The coexistence of users and networks requires careful and dynamic planning to mitigate interference. Otherwise, the network performance will be severely undermined. We study both spectrum sensing and spectrum access techniques and propose several transmit schemes for different types of cognitive ratio networks, including spectrum overlay and spectrum underlay systems. The proposed algorithms can improve spectral efficiency of the networks efficiently and have potentials to be used in future wireless communications networks.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectWireless communications
dc.subjectCognitive radio
dc.subjectSpectral efficiency
dc.subjectSpectrum sensing
dc.subjectSpectrum access mode
dc.subjectSpectrum overlay
dc.subjectSpectrum underlay
dc.titleSpectral-efficient design in modern wireless communications networks
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentElectrical and Computer Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberStüber, Gordon L.
dc.contributor.committeeMemberAkyildiz, Ian F.
dc.contributor.committeeMemberMa, Xiaoli
dc.contributor.committeeMemberYu, Xingxing
dc.date.updated2015-09-21T14:25:33Z


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