基于定向天线和中继随机分布的AF协作通信系统  

Multi-relay AF cooperative communication system with randomly distributed relays and directional antennas

作　　者：王明伟[1,2] 张会生[2] 李立欣[2] 李强华[1] 何立风 

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

出　　处：《陕西科技大学学报（自然科学版）》2017年第2期165-170,共6页Journal of Shaanxi University of Science & Technology

基　　金：中国博士后科学基金资助项目(2014M552489);中央高校基本科研业务费专项基金资助项目(3102014JCQ01052);陕西省科技厅基础研究计划项目(2016JM6062);陕西省咸阳市科技计划项目(2015K03-17)

摘　　要：研究采用定向天线并结合机会中继AF协作策略的多中继协作通信系统性能.假设中继节点在定向天线波束覆盖范围内满足二维泊松点过程随机分布,并且考虑到天线波束宽度与辐射功率、由于距离产生的信号衰减等因素,推导出了系统中断概率确切表达式并进行了仿真分析.结果表明:对于中继节点满足泊松点过程随机分布条件,采用定向天线并结合机会中继协作策略的AF协作通信系统可以有效降低协作通信系统中断概率,提高频谱效率.最后指出源节点和中继节点的发射功率对系统性能有重要影响,等功率分配方案不能保证系统性能最优.Combined the directional antennas with opportunistic relaying AF strategy,the performance of multi-relay cooperative communication system is studied.The exact expression for the outage probability of the system is derived for Rayleigh fading environment and the case where the directional antennas are used and the relaying nodes are assumed to be distributed as a homogeneous Poisson point random process with fixed density.Theoretical analysis and simulation results show that combined the directional antennas with opportunistic relaying AF strategy can effectively reduce the cooperative communication system outage probability,improve the spectrum efficiency.It is pointed out further that the transmission power of the source node and the relay node has an important effect on the performance of the system,and the equal power allocation scheme cannot guarantee the system with the best performance.

关 键 词：协作通信 定向天线 机会中继 中断概率 放大转发 

分 类 号：TN914[电子电信—通信与信息系统]