共存式频谱共享认知中继网络的中断性能研究  

Outage performance of cognitive relay networks with underlay spectrum sharing

作　　者：洪浩[1,2] 肖立民[2] 张焱[2,3] 王京[2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]清华信息科学与技术国家实验室,北京100084 [3]北京理工大学信息与电子学院,北京100081

出　　处：《电波科学学报》2013年第5期805-809,共5页Chinese Journal of Radio Science

基　　金：国家"九七三"重点基础研究项目(2012CB316000);国家863项目资助(2012AA011402);国家科技合作项目(2012DFG12010);国家自然科学基金重点项目(60832008);国家自然科学基金创新研究群体(61021001)

摘　　要：在共存式频谱共享的认知中继网络中,为了保证主用户的通信质量,会严格限制次用户的发送功率,使次用户的性能很难得到保证.中断概率是评估次用户性能的最重要参数之一.本文对采用"选择-最优中继放大转发"协议的多中继认知无线网络的中断性能进行了分析,分别给出了中断概率在广播阶段和中继阶段的精确表达式,并推导了接收端信噪比非独立时的联合概率密度.基于此,得到了在满足主用户对干扰功率限制的条件下,次用户网络中断概率的理论下界.通过数值仿真,验证了该理论分析的合理性.In cognitive relay networks with underlay spectrum sharing, the trans- mission power of secondary users is strictly confined, for protecting primary usersp quality of service （QoS）. Hence, the transmission performance of secondary users is difficult to be guaranteed. Outage probability is one of the most important meas- urements to evaluate system performance. In this paper, the outage performance is analyzed in the multiple-relay cognitive radio networks, which employs ＂selective- best relay amplify-and-forward （AF）＂ scheme. And the exact outage probability expressions in both broadcasting phase and relaying phase are obtained. Moreover, the joint probability density function is derived when the received signal-to-noise ra- tios （SNRs） are dependent. Based on that, the lower bound on outage probability is given, in the case that interference power to primary users is limited. Finally, through numerical simulation, the theoretical analysis is validated.

关 键 词：认知中继 中断概率 中继选择 功率受限 

分 类 号：TN929.5[电子电信—通信与信息系统]