一种认知无线电的二次频谱感知算法

摘要

在认知无线电(Cognitive Radio)系统中准确快速地频谱感知是有效通信的前提.如何均衡感知性能与感知时间是频谱感知技术面临的难题之一.现有的一次检测算法在这方面各有利弊.结合能量感知和PCA(Principal Component Analysis)感知的优势提出一种二次频谱感知的算法.首先利用双门限的能量感知算法进行初检.然后使用PCA感知算法对能量感知算法中检测值落于中间混淆区域的情况进行二次判决,以实现空闲频谱快速准确的感知.最后对该感知算法和其他传统感知算法的性能进行了仿真分析.仿真结果表明二次频谱感知算法提高了认知系统的频谱感知性能同时缩短了感知时间.%In cognitive radio systems fast and accurate spectrum sensing to communicate effectively is a prereq-uisite. How to tradeoff the throughput and detection reliability is one of difficult problems. At present the existing spectrum detection algorithms have advantages and disadvantages in this regard. The advantages of two algorithms use energy - detection of two thresholds for sensing early are combined, and then used the PCA ( Principal Compo-nent Analysis) algorithm to detect the middle of confusing area. Finally, the second spectrum detection algorithm and other traditional detection algorithm of performance are the simulation analysis. Simulation results show that the secondary spectrum sensing algorithm improves the performance of spectrum sensing of cognitive systems while re-ducing the perception of time.