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Cognitive radios are proposed to be the technology that will alleviate the problem of spectrum scarcity by using the underutilized radio frequency opportunistically on non-interfering basis. For this purpose the cognitive radio user must be able detect the available spectrum opportunity reliably and efficiently. In this paper, the authors consider the problem of spectrum sensing in Rayleigh fading environment for opportunistic access using energy detection in cognitive radio. The authors present the simulation results for cooperating Cognitive Radios (CR) in mobile and static environment in order to determine performance gain in terms of probability of detection, SNR, mobility and number of CR users.
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