随机桥过程研究短程无线信道的空时特性  

Applications of Stochastic Bridge Processes to Modeling Space-Time Characteristics of Short Range Wireless Propagation Channels

作　　者：扈罗全[1] 王正斌[1] 朱洪波[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003

出　　处：《电子与信息学报》2007年第8期1934-1937,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重点项目(60432040;60572024);教育部新世纪优秀人才支持计划(NCET-04-0519);教育部博士点基金项目(200509230031)资助课题

摘　　要：使用随机桥过程的样本建模短程无线信道中多径分量的传播轨迹。由随机桥过程的样本构造出基本随机变量,在一定的映射规则下由基本随机变量的样本得到反映无线信道空时特性的多径时延、多径信号抽头增益、多径信号的波达方向等参量。使用随机桥过程的特例布朗桥过程,分别对散射体均匀分布的信道传播环境和有约束的无线信道传播环境的空时特性进行仿真分析。仿真结果表明,在这两种传播环境中,多径分量的波达方向在仰角和水平角维度上均存在一定的局部偏好性,不满足均匀分布的假设。在仰角-水平角-多径分量到达时延这3个自由度的空间中,多径分量的分布表现出一定的规律性。The samples of stochastic bridge processes are employed to model propagation trajectories of Multi-Path Components （MPCs） in short range wireless propagation channels. Under some specialized mapping rules, the basic random variables constructed from samples of stochastic bridge processes are used to model the parameters of space-time channels, such as time delay, gains, direction-of-arrivals, etc. The Brownian bridge process, as a special example of stochastic bridge processes, is utilized to simulate the space-time characteristics both in the environment filled with scatterers randomly and in the special bounded propagation environment. The simulation results demonstrate that the direction-of-arrival of MPCs described by the elevation and the azimuth are slightly locally favorable in two propagation environment. Their distribution can not be regarded as uniform. And there is some regularity in the domain of elevation-azimuth-time delay.

关 键 词：无线通信 矢量信道模型 随机桥过程 信道特性 

分 类 号：TN92[电子电信—通信与信息系统]