Direct Link-Aware Relay Selection for Average Interference-Constrained Underlay Cognitive Radio

Das, Priyanka and Mehta, Neelesh B (2015) Direct Link-Aware Relay Selection for Average Interference-Constrained Underlay Cognitive Radio. In: IEEE International Conference on Communications (ICC), JUN 08-12, 2015, London, ENGLAND, pp. 2221-2226.

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Abstract

Cooperative relaying combined with selection exploits spatial diversity to significantly improve the performance of interference-constrained secondary users in an underlay cognitive radio network. We present a novel and optimal relay selection (RS) rule that minimizes the symbol error probability (SEP) of an average interference-constrained underlay secondary system that uses amplify-and-forward relays. A key point that the rule highlights for the first time is that, for the average interference constraint, the signal-to-interference-plus-noise-ratio (SINR) of the direct source-to-destination (SI)) link affects the choice of the optimal relay. Furthermore, as the SINR increases, the odds that no relay transmits increase. We also propose a simpler, more practical, and near-optimal variant of the optimal rule that requires just one bit of feedback about the state of the SD link to the relays. Compared to the SD-unaware ad hoc RS rules proposed in the literature, the proposed rules markedly reduce the SEP by up to two orders of magnitude.

Item Type:	Conference Proceedings
Series.:	IEEE International Conference on Communications
Publisher:	IEEE
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	23 Apr 2016 07:45
Last Modified:	23 Apr 2016 07:45
URI:	http://eprints.iisc.ac.in/id/eprint/53703

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