认知无线电中改进的低复杂度联合检测方法  

A Joint Spectral Detection Algorithm with Low Complexity in Cognitive Radio

作　　者：李映雪[1] 沈树群[1] 袁超伟[2] 王秋才[2] 

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]北京邮电大学信息与通信工程学院,北京100876

出　　处：《北京邮电大学学报》2013年第2期89-92,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60872149)

摘　　要：认知无线电频谱检测中能量检测算法在低信噪比下检测效率低,而似然比检测(LRT)算法复杂度过高.对此,首先在低信噪比下对LRT算法进行了化简,并给出了化简LRT算法性能参数的闭合表达式;提出了一种联合检测算法,在低信噪比条件下采用能量与简化LRT二次检测,在其他条件下则采用能量检测.理论分析和仿真结果均表明,所提算法在低信噪比下能对主用户信号有效检测,且实现复杂度低,检测性能优于LRT算法.For the problem of energy detection＇s inability of weak signals and the likelihood ratio test （LRT）＇s high computational complexity in cognitive radio, the LRT algorithm is simplified under low sig- nal-to-noise ratio （SNR） and its performance parameters are calculated. A spectrum joint detection algo- rithm is presented based on the simplified LRT, in which the energy detector and the simplified LRT un- der low SNR are used. Simulation shows that the algorithm detects the primary user signal effectively un- der low SNR condition, and performs close performance with lower complexity than that of the well-known LRT.

关 键 词：认知无线电 似然比检测 联合频谱检测 能量检测 

分 类 号：TN929.53[电子电信—通信与信息系统]