一种多载波激励信号下信道多径参数估计方法  

Estimation Method for Multipath Parameters with Multi-carrier Excitation Signal

作　　者：朱芮[1] 陶成[1,2] 欧阳刚[1] 刘留[1,2] 周涛[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《铁道学报》2015年第7期51-57,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(61371070);北京市自然科学基金(4142041);中央高校基本科研业务费(2014JBZ001);东南大学移动通信国家重点实验室开放研究基金(2012D07)

摘　　要：准确估计多径强度和多径相对时延是信道测量活动的目的之一,也是后续建立准确信道模型的基础。本文基于多载波激励信号的信道测量,研究了定时误差和多径相对时延的归一化非整数问题对估计多径参数的影响,并提出了一种新的多径强度和多径相对时延的估计方法。该方法利用定时误差和多径相对时延与功率时延谱之间的关系,能够准确的估计多径相对时延及各径强度,消除了归一化非整数的影响。仿真及实际测试结果表明,该方法较传统算法有较好的抗噪能力,在信噪比-10dB以上性能优良,对多径参数估计更为准确。An accurate estimation of the multipath signal strength and the multipath relative time delay,as one of the purposes of channel measurement campaigns,is the fundament of the subsequent establishment of an accurate channel model.Based on channel measurement with multi-carrier excitation signal,this article analyzes the effect of normalized non-integer of timing error and multipath relative time delay on the estimation of multipath parameters,and presents a new estimation method of multipath signal strength and the multipath relative time delay.Utilizing the relationships between the timing error,power delay profile and the multipath relative delay,this method estimates the relative time delay and the strength of multipath signal accurately,eliminating the influence of normalized non-integer.Simulations and actual experiments show that the method is better than traditional algorithm in terms of noise immunity,meaning that the method can achieve a good performance while SNRis above-10 dB,and provides more accurate multipath parameter estimation.

关 键 词：信道测量 多径强度 多径相对时延 功率时延谱 正交频分复用 

分 类 号：TN929.5[电子电信—通信与信息系统]