基于中继放大转发的多天线基站下行传输性能分析  

Performance Analysis of Downlink Systems with a Multi-Antenna Base Station Based on Amplify-and-Forward Relaying Strategy

作　　者：李光平[1,2] 张广驰[1] 崔苗[3] 冯久超[2] 

机构地区：[1]广东工业大学信息工程学院,广东广州510006 [2]华南理工大学电子与信息学院,广东广州510641 [3]中国电子科技集团公司第7研究所,广东广州510310

出　　处：《电子学报》2013年第7期1305-1312,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61102070);广东省自然科学基金(No.S2011040004135)

摘　　要：研究基站具有多根天线、中继与用户具有单天线的中继放大转发多用户系统,利用正交空时分组编码和机会主义调度策略同时获得空间分集和多用户分集.针对自适应增益和固定增益转发策略,首先导出独立不同分布瑞利衰落下系统中断概率和误码率的闭合表达式;随后根据高信噪比下系统的渐近性能确定系统的分集阶数,分析空间分集和多用户分集对系统性能的联合影响,并与单跳多天线基站下行传输系统进行性能比较;最后利用计算机仿真验证理论分析结果的正确性.A multiuser Amplify-and-Forward（AF） relay system is considered in which the source is equipped with multiple antennas,while the relay and each of multiple destinations have a single antenna.Orthogonal Space-Time Block Coding（OSTBC） is employed to achieve spatial diversity and opportunistic scheduling is used to obtain multiuser diversity.Closed-form expressions for outage probability and average Symbol Error Rate（SER） in independent but not identically distributed（i.n.i.d.） Rayleigh fading multiuser environments are derived for adaptive-gain and fixed-gain relaying methods.Asymptotic expressions for outage probability and average SER at high SNR are presented and used to determine the diversity order of the two relaying systems.The combined effect of spatial and multiuser diversity is quantified for the proposed system.Monte Carlo simulations demonstrate the accuracy of the analyses presented.Comparisons among the relaying methods and multiuser point-to-point systems are provided along with insights.

关 键 词：多天线系统 无线中继转发系统 正交空时分组编码 多用户分集 

分 类 号：TN911.5[电子电信—通信与信息系统]