认知频谱共享中最佳协作用户的选择  

Cooperative Spectrum Sharing Protocol with Best Secondary User Selection

作　　者：谢萍[1] 李立华[1] 田辉[1] 靳进[1] 朱莹[1] 

机构地区：[1]北京邮电大学泛网无线通信教育部重点实验室,北京100876

出　　处：《北京邮电大学学报》2013年第4期27-32,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(NSFC-AF 60911130512);国家科技重大专项项目(2012ZX03003012-004;2013ZX03003016);创新研究群体国家科学自然基金项目(61121001);长江学者和创新团队发展计划项目(PCSIRT IRT1049)

摘　　要：提出了一种基于主用户最佳中继选择的两阶段式协作传输协议.认知网络中包含1对主用户和K对二级用户,K对二级用户之间相互竞争主用户所拥有的频谱资源,在满足二级用户服务质量条件下,主用户选取1个二级发射作为其中继来转发信号.中继选择准则是使主用户获得最大的信号与干扰和噪声比.充当中继的二级发射在辅助译码转发主用户信号的同时,也给相应的二级接收传送所需信号.理论分析了主用户的中断性能,仿真结果验证了所提出的协作传输协议的有效性,即该传输策略在提高主用户服务质量的同时,也为二级用户提供使用授权频谱的机会.此外,也说明了随着二级用户个数的增加,主用户的中断性能有所提升.A two-phase cooperative transmission protocol based on best-relay selection for primary system is proposed in cognitive radio network, which consists of a primary transmitter-receiver pair and K see- ondary transmitter-receiver pairs. In the proposed protocol, with the transmission quality of service （QoS） constraints of secondary users, one of the secondary users coexisting in the same spectrum as the primary can be selected to serve as a decode-and-forward relay for primary system. The selection criterion is to maximize the ratio of signal to interference plus noise for the primary system. The outage perform- ance of the primary system is analyzed. Simulation confirms that the efficiency of the proposed spectrum sharing protocol, i. e. , the primary performance is improved. Meanwhile, the access opportunity for sec- ondary users can be also guaranteed. In addition, it is indicated that the primary user can achieve better outage performance as K increases.

关 键 词：频谱共享 协作传输 最佳中继选择 中断概率 

分 类 号：TN929.53[电子电信—通信与信息系统]