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dc.contributor.authorZafar, Ammar
dc.contributor.authorAlnuweiri, Hussein
dc.contributor.authorAlouini, Mohamed-Slim
dc.contributor.authorShaqfeh, Mohammad
dc.date.accessioned2013-05-21T05:28:54Z
dc.date.available2013-05-21T05:28:54Z
dc.date.issued2013-06-18
dc.identifier.issn1536-1276
dc.identifier.doi10.1109/TW.2013.060413.121136
dc.identifier.urihttp://hdl.handle.net/10754/292459
dc.descriptionAccepted in IEEE Transactions on Wireless Communications
dc.description.abstractWe propose joint user-and-hop scheduling over dual-hop block-fading broadcast channels in order to exploit multi-user diversity gains and multi-hop diversity gains all together. To achieve this objective, the first and second hops are scheduled opportunistically based on the channel state information. The joint scheduling problem is formulated as maximizing the weighted sum of the long term achievable rates of the users under a stability constraint, which means that in the long term the rate received by the relay should equal the rate transmitted by it, in addition to power constraints. We show that this problem is equivalent to a single-hop broadcast channel by treating the source as a virtual user with an optimal weight that maintains the stability constraint. We show how to obtain the source weight either off-line based on channel statistics or on real-time based on channel measurements. Furthermore, we consider special cases including the maximum sum-rate scheduler and the proportional fair scheduler. We also show how to extend the scheme into one that allows multiple user scheduling via superposition coding with successive decoding. Numerical results demonstrate that our proposed joint scheduling scheme enlarges the rate region as compared to scheduling schemes that exploit the diversity gains partially.
dc.language.isoen
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.subjectBroadcast channels
dc.subjectdual-hop
dc.subjectblock-fading
dc.subjectmulti-hop diversity
dc.subjectmulti-user diversity
dc.subjectjoint scheduling
dc.subjectoptimal resource allocation
dc.titleExploiting Multi-user Diversity and Multi-hop Diversity in Dual-hop Broadcast Channels
dc.typeArticle
dc.contributor.departmentCommunication Theory Lab
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.identifier.journalIEEE Transactions on Wireless Communications
dc.eprint.versionPre-print
dc.contributor.institutionTexas A&M University at Qatar (TAMUQ)
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personZafar, Ammar
kaust.personAlouini, Mohamed-Slim
refterms.dateFOA2018-06-13T14:02:05Z
dc.date.published-online2013-06-18
dc.date.published-print2013-07


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