Type
Conference PaperKAUST Department
Communication Theory LabComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Date
2013-03-20Online Publication Date
2013-03-20Print Publication Date
2012-12Permanent link to this record
http://hdl.handle.net/10754/244151
Metadata
Show full item recordAbstract
In this paper, 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 and as a prerequisite we assume that the relay, which is half-duplex and operates using decode-and-forward, is capable of storing the received packets from the source until the channel condition of the destined user becomes good to be scheduled. We formulate the joint scheduling problem as maximizing the weighted sum of the long term achievable rates by the users under a stability constraint, which means that on the long term the rate received by the relay should equal the rate transmitted by it, in addition to constant or variable 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 priority 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 demonstrate via numerical results that our proposed joint scheduling scheme enlarges the rate region as compared with a scheme that employs multi-user scheduling alone.Description
This paper has been accepted in Proceedings of the 8th Broadband Wireless Access Workshop (BWA) in conjunction with IEEE Global Communications Conference (GLOBECOM) 2012.Citation
Zafar, A., Shaqfeh, M., Alouini, M.-S., & Alnuweiri, H. (2012). Joint scheduling for dual-hop block-fading broadcast channels. 2012 IEEE Globecom Workshops. doi:10.1109/glocomw.2012.6477559Journal
2012 IEEE Globecom WorkshopsConference/Event name
2012 IEEE Globecom Workshops, GC Wkshps 2012ae974a485f413a2113503eed53cd6c53
10.1109/GLOCOMW.2012.6477559
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