En Masse relay selection algorithms for multi-source, multi-relay, decode-and-forward cooperative systems

Karthik, A and Mehta, Neelesh B (2013) En Masse relay selection algorithms for multi-source, multi-relay, decode-and-forward cooperative systems. In: IEEE Transactions on Communications, 61 (8). pp. 3170-3180.

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Abstract

Opportunistic relay selection in a multiple source-destination (MSD) cooperative system requires quickly allocating to each source-destination (SD) pair a suitable relay based on channel gains. Since the channel knowledge is available only locally at a relay and not globally, efficient relay selection algorithms are needed. For an MSD system, in which the SD pairs communicate in a time-orthogonal manner with the help of decode-and-forward relays, we propose three novel relay selection algorithms, namely, contention-free en masse assignment (CFEA), contention-based en masse assignment (CBEA), and a hybrid algorithm that combines the best features of CFEA and CBEA. En masse assignment exploits the fact that a relay can often aid not one but multiple SD pairs, and, therefore, can be assigned to multiple SD pairs. This drastically reduces the average time required to allocate an SD pair when compared to allocating the SD pairs one by one. We show that the algorithms are much faster than other selection schemes proposed in the literature and yield significantly higher net system throughputs. Interestingly, CFEA is as effective as CBEA over a wider range of system parameters than in single SD pair systems.

Item Type:	Journal Article
Publication:	IEEE Transactions on Communications
Publisher:	IEEE-Institute of Electrical and Electronics Engineers
Additional Information:	Copyright of this article belongs to IEEE-Institute of Electrical and Electronics Engineers.
Keywords:	Relay Selection; Multiple Source-Destination Networks; Splitting Algorithms; Cooperative Communications; Cross-Layer Design; Fading Channels; Multiple Access
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	04 Oct 2013 05:39
Last Modified:	04 Oct 2013 05:39
URI:	http://eprints.iisc.ac.in/id/eprint/47496

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