Principles of mobile communication (2nd ed.)
Principles of mobile communication (2nd ed.)
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
Switching Rate and Dwell Time in M-of-N Selection Diversity
IEEE Transactions on Wireless Communications
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The future deployment of cognitive radios (CRs) is critically dependent on the fact that the incumbent primary user (PU) system must remain as oblivious as possible to their presence. This in turn heavily relies on the fluctuations of the interfering CR signals. In this letter we compute the level crossing rates (LCRs) of the cumulative interference created by the CRs. We derive analytical formulae for the LCRs in Rayleigh and Rician fast fading conditions. We approximate Rayleigh and Rician LCRs using fluctuation rates of gamma and scaled noncentral x2 processes respectively. The analytical results and the approximations used in their derivations are verified by Monte Carlo simulations and the analysis is applied to a particular CR allocation strategy.