基于定向天线的多中继DF协作通信系统性能分析  

Performance analysis of multi-relay DF cooperative communication system based on directional antenna

作　　者：王明伟[1,2] 张会生[1] 李立欣[1] 何立风 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072 [2]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《电信科学》2016年第6期129-135,共7页Telecommunications Science

基　　金：中国博士后科学基金资助项目(No.2014M552489);中央高校基本科研业务费专项资金资助项目(No.3102014JCQ01052);陕西省科技厅基础研究项目(No.2016JM6062);陕西省咸阳市科技局自然科学专项基金资助项目(No.2015K03-17)~~

摘　　要：为提高多中继协作通信系统可靠性,将定向天线和多中继协作通信系统相结合,提出基于定向天线的解码转发最佳中继选择协作策略。首先理论推导出定向发送—定向接收模式下通信系统中断概率闭合表达式,并推导出定向发送—全向接收、全向发送—全向接收模式下的系统中断概率计算式。然后对3种模式下,协作通信系统中断概率和信噪比、中继节点数、天线增益、信道衰落系数以及信道容量之间的关系进行了数值仿真分析。理论分析和仿真结果表明,采用定向天线的协作通信系统可以有效降低协作通信系统中断概率,提高频谱利用率,并且存在最佳中继节点和最优功率分配系数使得中断概率进一步下降。In order to achieve reliable communication in multi-relay cooperative communication, the directionalantenna combining multi-relay cooperative communication system and optimal relay selection decode-and-forwardcooperative strategy was presented. Firstly, the theoretical closed form of outage probability of the communicationsystem using directional antenna operating in the three modes of DT-DR, DT-O R and OT-OR were presented. Thenfor three kinds mode, the collaboration communication system interrupt probability and signal-to-noise ratio, thenum ber of relay nodes, the antenna gain channel fading efficiency and relationship between the channel capacity wereanalyzed in numerical simulation. These findings reveal that excellent performance of cooperative communicationsystem with directional antennas could be achieved such as smaller outage probability and improved by best relaynodes and optimal power allocation coefficient.

关 键 词：协作通信 定向天线 机会中继 中断概率 解码转发 

分 类 号：TN914[电子电信—通信与信息系统]