基于干扰消除的LTE系统中定位参考信号时延估计  

Interference Cancellation Based Time Delay Estimation Using Position Reference Signal in LTE Systems

作　　者：王平[1] 赵卫波[1] 胡捍英[1] 

机构地区：[1]解放军信息工程大学,郑州450002

出　　处：《电子对抗》2013年第5期20-25,30,共7页Electronic Warfare

基　　金：基金支持：国家科技重大专项（2011ZX03003-003-02）

摘　　要：摘要针对LTE系统观测到达时间差定位（OTDOA）中定位参考信号（PRS）时延估计问题，提出一种利用干扰消除提高多小区环境下时延估计精度的方法。该方法针对临近基站定位信号可能会受到服务基站和其它临近基站多径定位信号的干扰，从而导致终端（UE）定位精度降低的情况，将服务基站干扰和临近基站互干扰分别进行干扰消除处理。首先利用服务基站小区参考信号（CRS）的信道估计结果重建服务基站信号并从接收信号中消去其干扰，然后利用串行干扰消除思想消除剩余临近基站的干扰，最后利用PRS信号特征将本地参考信号与接收信号做循环相关提取多径时延。仿真结果表明，所提方法可以提高时延估计精度，改善UE在服务基站附近区域的定位效果。An interference cancellation technique was proposed to improve the performance of position reference signal （PRS） time delay estimation in observed time difference of arrival （OTDOA） of LTE position location. Aimed at the accuracy degradation problem of user terminal （UE） caused by PRS interference from serving cell and other neighboring cells, the proposed algorithm cancelled the interference from serving cell and neighboring cells respectively before estimating the time delay of the target neighboring cell. First, the channel estimation result derived from cell reference signal （CRS） was used to rebuild and cancel the serving cell interference signal. Then, the residual interference from neighboring cells was cancelled through successive interference cancellation. Finally, the multi-path time delay was estimated, taking advantage of PRS characteristics, through the cyclic correlation of replica signal and received signal. Simulation results show that the estimation accuracy and UE location performance can be improved through interference cancellation.

关 键 词：长期演进 观测到达时间差定位 定位参考信号 时延估计 干扰消除 

分 类 号：TN914.53[电子电信—通信与信息系统]