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Inherent nature of Cognitive Radio (CR) networks has imposed some serious threats to wireless communications. One of the common threats is Primary User Emulation Attack (PUEA). In PUEA, some malicious users try to imitate primary signal characteristics and defraud CR users to prevent them from accessing the spectrum holes. As a countermeasure against PUEA, we propose Maximum Utility Detection (MUD) approach. A 3-level hypotheses test is considered and maximum utility criterion is applied to choose the hold hypothesis. Simulation results are provided to indicate the superiority of the proposed MUD method against PUEA compared with conventional method. General Terms Security, Spectrum Sensing, Cognitive Radio

Maximum Utility Function Approach for Detection of Primary User Emulation Attack in Cognitive Radio Networks