Review of Rate Regions for Interference Channels
IZS '06 Proceedings of the 2006 International Zurich Seminar on Communications
On the primary exclusive region of cognitive networks
IEEE Transactions on Wireless Communications
Cognitive radio: an information-theoretic perspective
IEEE Transactions on Information Theory
Interference and deployment issues for cognitive radio systems in shadowing environments
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Capacity of a Class of Cognitive Radio Channels: Interference Channels With Degraded Message Sets
IEEE Transactions on Information Theory
Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs
IEEE Communications Magazine
Estimation of radio capacity of a spread spectrum cognitive radio Rayleigh fading system
Proceedings of the 17th Panhellenic Conference on Informatics
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In this paper we consider the capacity of the cognitive radio (CR) channel in different fading environments under a "low interference regime". First we derive the probability that the "low interference regime" holds under shadow fading as well as Rayleigh and Rician fast fading conditions. We demonstrate that this is the dominant case, especially in certain practical CR deployment scenarios. The capacity of the CR channel depends critically on a power loss parameter, α, which governs how much transmit power the CR dedicates to relaying the primary message. We derive a simple, accurate approximation to α in Rayleigh and Rician fading environments which gives considerable insight into system capacity. We also investigate the effects of system parameters and propagation environment on α and the CR capacity. In all cases, the use of the approximation is shown to be extremely accurate.