Primary System Detection for Cognitive Radio: Does Small-Scale Fading Help?
Erik G. Larsson, G. Regnoli · IEEE Communications Letters · 2007
We consider the effect of small-scale fading on the detection of weak signals in cognitive radio systems. We formulate a model for the detection problem taking fading into account, and give the associated likelihood ratio tests. Additionally we give an expression for the asymptotic detection performance and use this to consider the tradeoff between the detection performance and the coherence time and bandwidth of the channel.