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The authors present a Neyman-Pearson Composite Hypothesis Test (NPCHT) and a Wald's Sequential Probability Ratio Test (WSPRT) to detect Primary User Emulation Attacks (PUEA) in cognitive radio networks. Most approaches in the literature on PUEA assume the presence of underlying sensor networks for localization of the malicious nodes. There are no analytical studies available in the literature to study PUEA in the presence of multiple malicious users in fading wireless environments. They present an NPCHT and WSPRT based analysis to detect PUEA in fading wireless channels in the presence of multiple randomly located malicious users. They show that there is a range of network radii in which PUEA are most successful.
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