高速铁路移动通信中的一种频偏校正方法  

A frequency offset correction method in high speed rail mobile communication

作　　者：李美艳[1] 

机构地区：[1]西安外事学院工学院,陕西西安710077

出　　处：《陕西理工学院学报（自然科学版）》2013年第3期14-17,27,共5页Journal of Shananxi University of Technology:Natural Science Edition

摘　　要：高速铁路移动通信中对LTE系统性能影响最大的因素是多普勒效应。因此,频偏估计与频偏补偿是高速铁路移动通信中一个最主要的研究内容。为了抑制高速铁路移动通信中较大的多普勒频偏所带来的系统解调性能恶化,保证高速铁路移动通信中的网络覆盖质量,基站接收机必须能够对上行接收数据的频偏进行实时跟踪校正。分析高速铁路移动通信中多普勒频偏对LTE系统带来的影响,提出一种自适应的频偏校正方法。仿真结果表明校正方法明显地提升了基站的解调性能,能够有效地解决高速铁路移动通信中由于高速移动而带来的多普勒大频偏问题。Doppler effect is the factor that exerts greatest impact on the performance of LTE in high- speed rail mobile communication system. Therefore, frequency offset estimation and compensation is a key re- search issue in high-speed rail mobile communication. In order to restrain the deterioration of the demodulation performance from large Doppler frequency shift in high speed rail mobile communication, and ensure network coverage ＆ quality, the base station receiver must be able to perform frequency offset estimation and compen- sation for received data on the uplink in real time. Based on an analysis of the Doppler shift in high-speed rail mobile communication impact on the LTE system, the paper proposes a frequency offset correction. The simu- lation results show that the correction method for baseband demodulation performance has improved significant- ly, and the high-speed rail traffic problems in the Doppler shift are effectively solved.

关 键 词：高铁移动通信 长期技术演进 多普勒效应 频偏校正 

分 类 号：TN929.5[电子电信—通信与信息系统]