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TitleRobust cognitive radio cooperative beamforming
Publication TypeJournal Article
Year of Publication2014
AuthorsSingh, S., Teal P.D., Dmochowski P.A., and Coulson A.J.
JournalIEEE Transactions on Wireless Communications
Pagination6370 - 6381
Date Published2014
ISSN15361276 (ISSN)
KeywordsBeamforming, Channel state information, Cognitive radio, Convex optimisation, Convex optimization, Cooperative beamforming, Distribution functions, Fading (radio), Fading channels, Interference management, Optimization, Outage probability, Outages, Power control, Radio transmission, Rayleigh fading, relay, Robust beamforming, Semidefinite relaxation, Signal interference, Signal receivers, Signal to noise ratio, Spurious signal noise
AbstractWe consider a cognitive radio (CR) relay network consisting of a cognitive source, a cognitive destination and a number of cognitive relay nodes that share spectrum with a primary transmitter and receiver. Due to poor channel conditions, the cognitive source is unable to communicate directly with the cognitive destination and hence employs the cognitive relays for assistance. We assume that perfect channel state information (CSI) for all links is not available to the CR. Under the assumption of partial and imperfect CSI at the CR system, we propose new robust CR cooperative relay beamformers where either the total relay transmit power or the cognitive destination signal-to-interference-and-noise ratio (SINR) is optimized subject to a constraint on the primary receiver outage probability. We formulate the robust total relay power minimisation and the cognitive destination SINR maximisation optimisation problems as a convex second order cone program and a semidefinite program, respectively. Cumulative distribution functions of primary receiver and cognitive destination receiver SINR for Rayleigh fading channels are presented. © 2002-2012 IEEE.

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