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This paper analysis performance of energy detection technique for cognitive radio which implies spectrum sensing. Main objective is to reduce interference occur in the cognitive radio systems. Spectrum detection schemes are based on fixed threshold these are sensitive to noise; the energy detection based on dynamic threshold can improve the resistance of noise and get a good performance of detection while without increasing the complexity and improves detection performance. At the same time, security issues of cognitive radio have received more attentions recently since the inherent Properties of CR networks would pose new challenges to wireless communications.
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