认知中继选择系统发射功率受限时的性能研究  

Research on property of cognitive relay selection system with transmission power constraint

作　　者：姬士龙 郭辉[1] 王利红[1] 

机构地区：[1]河南理工大学计算机科学与技术学院,河南焦作454000

出　　处：《传感器与微系统》2016年第8期63-66,共4页Transducer and Microsystem Technologies

基　　金：河南省教育厅科学技术研究重点项目(12B510011;12A520022);河南理工大学博士基金资助项目(B2013-036;B2009-21)

摘　　要：基于译码转发协议,对一个双跳认知中继选择系统的中断性能进行了研究。该系统采用半双工的通信模式,所有节点均配置单个天线,次级系统同时受到来自于主接收用户最大干扰功率和最大传输功率的双重限制。在独立非同一分布的瑞利信道环境下,推导出了中断概率的准确闭合表达式和高传输功率时的渐进闭合表达式,并利用蒙特卡罗仿真实验对理论分析结果的正确性进行了验证。实验结果表明:中继个数的增加降低了中断概率,提升了系统的性能,但是提升空间有限。另外,最大干扰门限和最大传输功率的变化关系给系统性能的提升带来瓶颈。Break off performance of a dual-hop cognitive relay selection system is researched based on decodeand-forward（ DF） protocol. The system uses half-duplex communication mode and all nodes are equipped with single antenna. Also,both the maximum interference power from primary receiver and the maximum transmission power constraint secondary system. Moreover,both the exact closed-form expression for break off probability and high transmission power asymptotic closed-form expressions are derived in non-identical Rayleigh fading channel environments. The correctness of theoretical analysis result is verified via Monte-Carlo simulations. Experimental results show that break off probability is reduced and the system performance is improved as numbers of relays increase,but improvement is limited. Moreover,changing relationship between the maximum interference threshold and the maximum transmission power brings bottleneck to improvement of system.

关 键 词：认知协作通信 译码转发 瑞利衰落 最大传输功率 干扰限制 

分 类 号：TN929.5[电子电信—通信与信息系统]