无线信道中多簇散射参数估计  

Multiple Clusters Scattering Parameters Estimation in Wireless Channel

作　　者：刘杉坚[1,2] 张焱[2] 芮艳华[2] 周世东[2] 王庭昌[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210016 [2]清华大学信息科学技术国家实验室,北京100084

出　　处：《系统仿真学报》2009年第13期4125-4128,4134,共5页Journal of System Simulation

基　　金：新世纪优秀人才计划(NECT-050071);国家自然科学基金(90204001);863项目(2006AA01Z282)

摘　　要：由于无线信道环境中,散射物并非均匀分布,而是趋向于在集中在某个区域,信号的传播过程中经过多次反射、散射,到达接收端的多条路径在时间和空间上会成簇的现象,因而在信道建模中如何准确刻画簇的传播特征,对于通信系统的参数设计显得非常关键。对同一簇内多径信号的空间传播特征,可以用来波方向波达角的中心波达方向(均值)和角度扩展(或者方差)两个统计参数描述。针对如何提取信道环境中多个簇内多径分量的空间传播参数,提出通过一种低复杂度串行一维搜索算法代替联合最大似然估计算法,通过实际测量数据对算法进行了验证,实验表明所提出的低复杂度算法能准确地描述实际传播信道环境。For the radio channel environment, it is a well-established fact that the scatterer locations are nor distributed uniformly over space, but tend to be concentrated in certain region. By the multiple reflection and dispersion, the multipaths may be shown as a cluster in spatial and delay domain. In channel model, it is crucial for system parameters design to depict the cluster propagation characteristic accurately. The multipaths of the same cluster can be described with two parameters, the nominal azimuth and the angular extension. A low complexity sequential searching algorithm was introduced to estimate the two parameters of the multiple clusters. The emulation of the actual channel measurement result illustrates the proposed algorithm can accurately characterize the radio propagation channel and reduce the computation complexity.

关 键 词：多簇 串行搜索 参数估计 无线信道 

分 类 号：TN911.7[电子电信—通信与信息系统]