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TitleInterference management in cognitive radio systems - A convex optimisation approach
Publication TypeConference Paper
Year of Publication2012
AuthorsSingh, S., Teal P.D., Dmochowski P.A., and Coulson A.J.
Conference NameIEEE International Conference on Communications
Date Published2012
KeywordsConvex programming, Cumulative distribution function, Geometric program, Interference management, Optimisations, Optimization, Peak-power constraints, Power allocations, Problem formulation, Quality of service, Radio systems, Signal interference, Signal-to-interference and noise ratios, Spurious signal noise
AbstractWe consider a cognitive radio system with N secondary user (SU) pairs and a pair of primary users (PU). The SU power allocation problem is formulated as a rate maximisation problem under PU and SU quality of service and SU peak power constraints. We show our problem formulation is a geometric program and can be solved with convex optimisation techniques. We examine the effect of PU transmissions in our formulations. Solutions for both low and high signal-to-interference-and-noise ratio (SINR) scenarios are provided. We show that including the PU rate in the optimisation problem leads to increased PU performance while not significantly degrading SU rate. Achievable rate cumulative distribution functions for various Rayleigh fading channels are produced. © 2012 IEEE.

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