Optimization of threshold for local spectrum sensing with energy detector |
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| Authors: | ZHAI Xu-ping HE Hai-gen ZHENG Guo-xin |
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| Institution: | Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, P. R. China |
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| Abstract: | 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. |
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| Keywords: | spectrum sensing energy detector optimal threshold dynamic threshold scheme |
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