LTE系统中采用干扰消除技术的TDOA定位方法  

A TDOA location scheme using interference cancellation in LTE systems

作　　者：赵军辉[1,4] 赵聪[2] 束锋[3] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京邮电大学电子工程学院,北京100876 [3]南京理工大学电子工程与光电技术学院,南京210094 [4]东南大学移动通信国家重点实验室,南京210096

出　　处：《高技术通讯》2012年第6期566-570,共5页Chinese High Technology Letters

基　　金：国家自然科学基金（61172073）,中央高校基本科研业务费和东南大学移动通信国家重点实验室资助项目.

摘　　要：为长期演进计划（LTE）通信系统提出了一种采用干扰消除技术来改进信号到达时间差（TDOA）的移动台定位方法。该方法针对移动台在靠近小区中心时接收邻近小区基站信号会受到服务基站和其他基站信号以及噪声的干扰，从而导致定位精度下降的情况，首先在信号接收端重建干扰并且从接收信号中对其进行消除，然后基于正交频分复用（OFDM）通信系统使用相关估计法估算信号传播时间，最后通过加权最小二乘法估算移动台的位置坐标。在多径传播以及非视距（NLOS）传播无线环境中，仿真实验证明，采用该方法可以有效改善靠近小区中心的移动台的定位精度。A time difference of arrival （TDOA） location algorithm using the interference cancellation technique to localize mobile stations for LTE （ the long-term evolution） communication systems. Aiming at the problem that a mobile sta- tion＇ s received signals from neighbor base stations would be easily disturbed by the serving base station, other base stations and noise, especially when it is near to the serving base station, hence the location precision would be de- graded by the interference, the proposed algorithm reconstructs the above interference and subtracts it from the re- ceived signals, and then, the signal propagation time is estimated by using a correlation method based on the or- thogonal frequency division multiplexing （OFDM） communication system, and finally, the location of the mobile station is calculated by the weighted least square （WLS） method. The simulation results validated the proposed al- gorithm and showed that the location accuracy of the mobile station nearby the serving base station could be signifi- cantly improved by using the interference cancellation technique.

关 键 词：无线定位 到达时间差(TDOA) 干扰消除 非视距(NLOS) 

分 类 号：TN914[电子电信—通信与信息系统]