首页|Optimization of threshold for local spectrum sensing with energy detector
Optimization of threshold for local spectrum sensing with energy detector
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Spectrum sensing is the first step of cognitive radio (CR).In this area, previous researches mostly consider distributed local nodes which are under identical channel conditions, hence uniform and fixed detection threshold is set with energy detector.However, the distributions of nodes in real environments are not quite the same.In this paper, the optimal threshold to minimize the total detection error over additive white Gaussion noise (AWGN) channel is derived firstly.Then the dynamic threshold scheme is proposed to reduce the average total detection error.Simulations have shown that, with this scheme, sensing performance is improved.
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, P. R. China
Shanghai Leading Academic Discipline ProjectScience and Technology Commission of Shanghai Municiplity国家自然科学基金
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