基于分形相关盒维数的分步合作频谱感知方法  

Step By Step Cooperative Spectrum Sensing Based on Related Box Dimension

作　　者：刘文涛[1] 陈红[1] 蔡晓霞[1] 

机构地区：[1]解放军电子工程学院,合肥230037

出　　处：《火力与指挥控制》2014年第6期97-99,103,共4页Fire Control & Command Control

摘　　要：提出一种基于分形相关盒维数的分步合作频谱感知方法,通过对信号进行自相关运算,然后求取其盒维数值,利用恒虚警检测得到判决门限进行判决,在所有认知用户中随机选择参与运算的认知用户,并反馈有益信息。仿真结果表明,该方法在保证检测准确率的同时,降低了认知系统合作频谱感知所带来的额外开销和频谱检测时长,减轻合作控制中心的负荷,整体上提高了认知系统的检测性能。This paper presents a CFAR（constant false alarm）detection method based on fractal box dimension. By the experiment fitting,it is know the box dimension of noise basically obeys the Gaussian distribution. The threshold by the constant false alarm detection can be gotten. Simulation results show that by the threshold based on the constant false alarm detection can a same probability of false-alarm as that we set be gotten. This method improves the credibility of spectrum sensing and the reliability of the algorithm.

关 键 词：频谱感知 相关盒维数 恒虚警 判决门限 

分 类 号：TN92[电子电信—通信与信息系统]