Level Crossing Rates of Interference in Cognitive Radio Networks

Details Level Crossing Rates of Interference in Cognitive Radio Networks Level Crossing Rates of Interference in Cognitive Radio Networks

2009-05-22

arxiv.org/abs/0905.3602v1

Computer Science

Information Theory

submitted to the IEEE Transactions on Wireless Communications

Scientific paper

The future deployment of cognitive radios is critically dependent on the fact that the incumbent primary user system must remain as oblivious as possible to their presence. This in turn heavily relies on the fluctuations of the interfering cognitive radio signals. In this letter we compute the level crossing rates of the cumulative interference created by the cognitive radios. We derive analytical formulae for the level crossing rates in Rayleigh and Rician fast fading conditions. We approximate Rayleigh and Rician level crossing rates using fluctuation rates of gamma and scaled noncentral $\chi^2$ 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.

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