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Novel Relay Selection Rules for Average Interference-Constrained Cognitive AF Relay Networks

Das, Priyanka and Mehta, Neelesh B and Singh, Gagandeep (2015) Novel Relay Selection Rules for Average Interference-Constrained Cognitive AF Relay Networks. In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 14 (8). pp. 4304-4315.

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Official URL: http://dx.doi.org/10.1109/TWC.2015.2419221


Cooperative relaying combined with selection exploits spatial diversity to significantly improve the performance of interference-constrained secondary users in an underlay cognitive radio (CR) network. However, unlike conventional relaying, the state of the links between the relay and the primary receiver affects the choice of the relay. Further, while the optimal amplify-and-forward (AF) relay selection rule for underlay CR is well understood for the peak interference-constraint, this is not so for the less conservative average interference constraint. For the latter, we present three novel AF relay selection (RS) rules, namely, symbol error probability (SEP)-optimal, inverse-of-affine (IOA), and linear rules. We analyze the SEPs of the IOA and linear rules and also develop a novel, accurate approximation technique for analyzing the performance of AF relays. Extensive numerical results show that all the three rules outperform several RS rules proposed in the literature and generalize the conventional AF RS rule.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords: Underlay cognitive radio; interference constraint; cooperative communications; relays; amplify-and-forward; selection; symbol error probability
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 11 Sep 2015 04:54
Last Modified: 11 Sep 2015 04:54
URI: http://eprints.iisc.ac.in/id/eprint/52335

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