Exploiting Multi-user Diversity and Multi-hop Diversity in Dual-hop Broadcast Channels

Handle URI:
http://hdl.handle.net/10754/292459
Title:
Exploiting Multi-user Diversity and Multi-hop Diversity in Dual-hop Broadcast Channels
Authors:
Zafar, Ammar ( 0000-0001-8382-7625 ) ; Alnuweiri, Hussein; Alouini, Mohamed-Slim ( 0000-0003-4827-1793 ) ; Shaqfeh, Mohammad
Abstract:
We 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.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Communication Theory Lab
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Transactions on Wireless Communications
Issue Date:
21-May-2013
DOI:
10.1109/TW.2013.060413.121136
Type:
Article
Description:
Accepted in IEEE Transactions on Wireless Communications
ISSN:
1536-1276
Appears in Collections:
Articles; Communication Theory Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZafar, Ammaren
dc.contributor.authorAlnuweiri, Husseinen
dc.contributor.authorAlouini, Mohamed-Slimen
dc.contributor.authorShaqfeh, Mohammaden
dc.date.accessioned2013-05-21T05:28:54Z-
dc.date.available2013-05-21T05:28:54Z-
dc.date.issued2013-05-21en
dc.identifier.issn1536-1276en
dc.identifier.doi10.1109/TW.2013.060413.121136en
dc.identifier.urihttp://hdl.handle.net/10754/292459en
dc.descriptionAccepted in IEEE Transactions on Wireless Communicationsen
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.en
dc.language.isoenen
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectBroadcast channelsen
dc.subjectdual-hopen
dc.subjectblock-fadingen
dc.subjectmulti-hop diversityen
dc.subjectmulti-user diversityen
dc.subjectjoint schedulingen
dc.subjectoptimal resource allocationen
dc.titleExploiting Multi-user Diversity and Multi-hop Diversity in Dual-hop Broadcast Channelsen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentCommunication Theory Laben
dc.identifier.journalIEEE Transactions on Wireless Communicationsen
dc.eprint.versionPre-printen
dc.contributor.institutionTexas A&M University at Qatar (TAMUQ)en
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorZafar, Ammaren
kaust.authorAlouini, Mohamed-Slimen
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