双门限协作能量检测性能分析

传统的单门限能量检测，如果有突发噪声或者其它因素，产生误检的概率会比较大。使用基于OR准则的双门限协作能量检测算法，检测时对每个用户设定两个判决门限，利用多个用户检测结果进行OR准则协作判决，提升检测性能。数值仿真结果表明，这一方法能够提高频谱检测概率、抑制漏检率。当信噪比较低、认知用户数N=5时，双门限性能最高要比单门限高出22％；认知用户数N=10时，双门限性能最高要比单门限高出17％。实际应用中，低信噪比的恶劣环境居多，因此双门限检测具有不可比拟的优势，应用空间非常广阔。

Performance Analysis of Double-Threshold Cooperation Energy Detection

It has shown that single - threshold energy detection algorithm maybe cause serious detection performance while sudden noise and other interference factors existing. We used a double - threshold energy detection algorithm based on the OR rule to al- leviate the interference. This algorithm set two detection thresholds to every user and cooperative detect through ＇all users＇ detec- tion results based on OR rule. It can increase detection performance. The simulation results indicated that this algorithm could improve the probability of spectrum detection, and simultaneously depress the probability of missing detection. When tile number of cognitive users was N = 5, double - threshold performance was 22% higher than single - threshold while signal to noise ratio （SNR） was lower; when the number of cognitive users was N = 10, double -threshold performance was 17% higher than single - threshold. In practical situation, environment of low SNR is mostly harsh. So double - threshold algorithm has imponderable advantages and broad applications.