基于SAGE的近场信道参数估计方法  

Channel Parameter Estimation Method in Near-field Radio Environment Using SAGE Algorithm

作　　者：张焱[1] 胡昕炜[1] 周世东[1] 王京[2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]清华大学信息技术研究院,北京100084

出　　处：《系统仿真学报》2011年第9期1932-1936,共5页Journal of System Simulation

基　　金：国家重点基础研究发展规划项目(2007CB310608);国际科技合作项目(2008DFA12160);新世纪优秀人才支持计划(NECT-050071)

摘　　要：在室内无线传播环境中,散射体与接收端之间的距离并不一定满足远场假设,这时到达接收端的多径信号是近场球面波形式,从而会对波达角和角度扩展的估计造成影响。对近场多径信道参数的估计需要同时考虑近场散射体与接收阵列之间的波达角和距离。基于空间交替通用期望最大化(SAGE)算法的基本思想,提出了一种的近场信道参数低复杂度估计方法,可以对近场散射体分量的时延、波达角、多普勒、复幅度等参数与距离参数进行联合估计。仿真实验验证了该算法能够准确地对近场散射体的距离和角度进行联合估计。In the indoor radio propagation environment,the distances between the scatterers and receiver may not satisfy the far-field assumption.The near-field multipath signal arrives at the receiver in the spheroidal wave form.Thus the estimation of direction of arrival（DOA） and angular spread will be affected.Both the DOAs and the distances of the near-field scatterers need to be specified for the near-field channel parameter estimation.A near-field low-complexity channel parameter estimation method was supposed on basis of the Space-Alternating Generalized Expectation-Maximization（SAGE） algorithm.This method could provide the joint estimation results of delay,DOA,Doppler frequency,complex amplitude and distance.Simulations results show that this method can provide precise estimations of the near-field scatterers＇ DOA and distance.

关 键 词：近场源 空间交替通用期望最大化 定位 波达角 

分 类 号：TN911.7[电子电信—通信与信息系统]