多天线蜂窝系统中基站协作机会调度  

Cooperative Opportunistic Scheduling for Base Stations in Multiple Antenna Cellular Systems

作　　者：雷俊[1] 石明军[2] 赵明[3] 李云洲[1] 姚彦[1] 

机构地区：[1]微波与数字通信技术国家重点实验室,北京100084 [2]清华信息科学与技术国家实验室,北京100084 [3]清华大学电子工程系,北京100084

出　　处：《北京邮电大学学报》2009年第4期30-34,39,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家高技术研究发展计划项目(2006AA01Z274);国家重点基础研究发展规划项目(2007CB310608)

摘　　要：为了降低多天线蜂窝系统中的小区间干扰,基于干扰受限两小区模型提出了多个基站协作机会调度算法.计算证明干扰信号功率呈指数分布,并利用极值理论框架分析了使用协作机会调度得到的平均速率;利用简明的平均速率近似闭式解,得到使用协作机会调度所获得的多用户分集增益;针对实际蜂窝系统中分析了不同因素对协作机会调度算法和性能的影响.仿真结果表明,基站协作机会调度可以有效降低小区间干扰,提高系统性能.特别地,在每小区用户数为K的系统中,非协作机会调度得到的多用户分集增益为lglgK,而使用协作机会调度可以将多用户分集增益提高到lgK.Cooperative scheduling between base stations is proposed to reduce inter-cell interference in multiple antenna cellular communication systems. Based on interference-limited two-cell model, cooperative opportunistic scheduler is proposed and analyzed. The interference signal power is proven to be exponentially distributed. The concise expression of the approximated average rate and the multiuser diversity gain are derived by utilizing extreme value theory. Furthermore, the impact of several factors on the cooperative opportunistic scheduling in practical cellular systems is discussed. The multiuser diversity gain of noncooperative opportunistic scheduling is shown as withusers per cell, whereas that achieved by the proposed cooperative opportunistic scheduler is. Simulation shows that the proposed cooperative opportunistic scheduler can effectively reduce inter-cell interference and achieve significant gain.

关 键 词：无线通信 多天线蜂窝系统 基站协作 机会调度 极值理论 多用户分集 

分 类 号：TN929.53[电子电信—通信与信息系统]