基于熵最小化的协作式随机检测宽带频谱的策略  

Least entropy based randomized strategy for wideband spectrum sensing with cooperation

作　　者：麦磊鑫[1] 秦晓卫[1] 戴旭初[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230027

出　　处：《通信学报》2010年第11期130-137,共8页Journal on Communications

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(2007CB310602);国家科技支撑计划基金资助项目(2008BAH30B11);广东省中国科学院全面战略合作基金资助项目(2009B091300010)~~

摘　　要：针对认知无线电中的宽带频谱检测,从信息熵角度分析了信道状态估计的准确性与熵的关系,进而提出一种基于熵最小化的协作式随机检测宽带频谱的策略。该策略充分利用了信道状态的先验信息和实际检测所得信息,选择使系统信息熵最小化的信道进行检测,从而自动调节各个信道检测时间间隔。性能分析和仿真实验表明,基于熵最小化的检测策略有效地提高了信道状态估计准确性和检测的效率。To study the strategy for wideband spectrum sensing in cognitive radio system,the relation between the accuracy of channel state estimation and entropy was analyzed from the perspective of information entropy.And then a least entropy based randomized strategy（LERS） for wideband spectrum sensing with cooperation was proposed.By fully utilizing priori information and actually sensed results of channel states,the proposed strategy could select sensing channels to minimize total entropy,and the spectrum sensing interval of each channel was automatically regulated.Theoretic analyses and simulation results show that the least entropy based strategy effectively improves the accuracy of channel state estimation and the efficiency of spectrum sensing.

关 键 词：认知无线电 频谱检测策略 信道状态估计 检测时间间隔 熵最小化 

分 类 号：TN92[电子电信—通信与信息系统]