CMMB主用户信号的能量检测技术研究  

Energy Detection for CMMB Primary User Signal

作　　者：刘会衡 罗倩倩 王正强 LIU Hui-heng;LUO Qian-qian;WANG Zheng-qiang(School of Physics and Electronic Engineering, Hubei University of Arts and Science, Xiangyang Hubei 441053, China)

机构地区：[1]湖北文理学院物理与电子工程学院,湖北襄阳441053

出　　处：《通信技术》2017年第12期2722-2726,共5页Communications Technology

基　　金：湖北省教育厅科学研究计划项目(No.D20162603);湖北文理学院科研基金项目资助(No.2016ZK020)~~

摘　　要：认知无线电是提高频谱利用率的有效手段。CMMB是一种移动多媒体广播制式。当CMMB主用户不在线时,次用户可以使用该频段进行通信,前提是检测出频谱空洞。在基于认知无线电的系统中,研究和分析CMMB主用户信号的本地能量检测技术,给出了检测概率和虚警概率表达式,并推导了等增益合并(EGC)方式下的协作检测概率。仿真结果表明,EGC软合并方式的检测性能优于OR规则硬合并方式和本地能量检测技术,但增加了网络开销。Cognitive radio is one of the most effective techniques to improve the spectrum utilization efficiency,while CMMB a kind of mobile multimedia broadcasting system.When the CMMB primary user is not online,the secondary user can use the frequency band for communication by detecting the spectrum holes.The local energy detection technologies of CMMB primary user signal in the system based on cognitive radio are discussed and analyzed and the expressions of detection probability and false-alarm probability also given.Then the cooperative detection probability of EGC(Equal Gain Combining)method for CMMB primary user signal is derived.The simulation results indicate that the detection performance of EGC soft combination method outperforms those of the hard combination of OR rule and local energy detection scheme.However,the network overhead of EGC scheme is also increased.

关 键 词：能量检测 CMMB 等增益合并 OR规则 认知无线电 

分 类 号：TN911[电子电信—通信与信息系统]