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This paper proposes new method to optimize the overall performance in hard cooperative spectrum sensing in cognitive radio. Optimization strategy is proposed in order to optimize the overall performance by variation of SNR. Here given strategy contributes to the methods in the literature by taking their performances to the peak point. Additionally, the effects of spectrum sensing technique type that used locally at each CR, the local SNR, and the total number of cooperated CRs on the optimal fusion rule are found. The energy detector (ED) spectrum sensing technique is examined as local spectrum sensing techniques. Here different error levels are founded by variation of SNR. The optimal number of CRs form minimizing the error at SNR 5,10,13,17,18,20 are found to be 4 or 5, 5, 5 or 6, 6, 8, 9 respectively.

NEW OPTIMIZATION SCHEME FOR COOPERATIVE SPECTRUM SENSING TAKING DIFFERENT SNR IN COGNITIVE RADIO NETWORKS