多蜂窝分布式系统下行链路性能分析  

Downlink Performance Analysis of Distributed Antenna Systems in Multi-cell Environment

作　　者：刘玉玺[1] 刘琚[1,2] 郑丽娜[1] 许宏吉[1,2] 郭卫栋[1] 

机构地区：[1]山东大学信息科学与工程学院,济南250100 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《电子与信息学报》2011年第10期2287-2292,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60872024);高等学校科技创新工程重大项目培育资金(708059);移动通信国家重点实验室开放基金(2010D10);山东大学自主创新基金(2010JC007)资助课题

摘　　要：在多蜂窝分布式通信系统中,当移动用户在蜂窝内运动时,该文研究其下行链路的系统容量变化情况,并且推导出容量的闭合表达式。多数文献采用中心极限定理(CLT)把干扰加噪声项看作高斯白噪声来进行性能分析,其前提条件是干扰项足够多。当干扰项较少时,此种方法存在一定的误差。该文在放宽此限制条件的前提下,利用矩生成函数(MGF)对系统性能重新进行分析并且解决了存在重根时系统容量闭合表达式的推导问题。理论分析和数值仿真表明,此分析方法能更确切地体现信道衰落对干扰信号的影响,进而能更好地描述系统的性能。The capacity of a Mobile User （MU） is analyzed for downlink distributed communication system in multi-cell environment, when MU locates at any position within the cell. Moreover, the closed-form expression of the capacity is derived. Most papers adopt Central Limit Theory （CLT）, and the precondition of it is that the interference terms are more enough. If the interference terms are few, the CLT method has defects in system performance analysis. The contribution of the paper is that the constraint condition is relaxed. The interference plus noise is considered as Gaussian noise with fixed variance when adopting CLT. On the contrary, the variance of the interference plus noise is considered as a random variable influenced by transmit power as well as propagation pathloss in the paper. Under the relaxed condition, the system performance is re-analyzed and the repeated-root problem making use of Moment Generation Function （MGF） is overcome. Through theoretical analysis along with numerical simulations, it demonstrates that the proposed analytical method can represent the propagation pathloss effect on interference more accurately. Thus, the whole system performance is improved.

关 键 词：无线通信 分布式天线系统 系统容量 多蜂窝 小区间干扰 

分 类 号：TN929.5[电子电信—通信与信息系统]