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Most existing schemes for cooperative spectrum sensing are typically vulnerable to attacks made by malicious users who transmit false sensing data. To nullify this effect, the authors propose a Fuzzy Secure Spectrum Sensing (F3S) scheme in which fuzzy logic is employed to identify malicious users. They further propose a Fuzzy Trust Level and Suspicious Level of each user based on fuzzy logic. Sensing information from secondary users is incorporated into cooperative sensing based on their fuzzy trust level, which increases robustness of cooperative sensing. Simulation results verify the effectiveness of their proposed scheme.
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