Directional Beamforming for High-Speed Railway Communications with Frequency Offset Precorrection  

作　　者：CAO Yuan WEN Yinghong XU Wei XIE Xin 

机构地区：[1]School of Electronics and Information Engineering, National Engineering Research Center of Rail Transportation Operation and Control System, Beijing Jiaotong University [2]State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University [3]National Mobile Communications Research Lab., Southeast University

出　　处：《Chinese Journal of Electronics》2014年第1期163-168,共6页电子学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.2012JBM023);the State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University(No.RCS2011K003);the 973 program(No.2013CB329204);the National Natural Science Foundation of China(No.61101087);the Specialized Research Fund for the Doctoral Program of Higher Education(No.20110092120011,No.20120009120004)

摘　　要：This paper considers a multi-antenna transmission strategy for high speed railway communications. In order to achieve better performance than conventional space-frequency block coding schemes, we propose a directional beamforming strategy for the High-speed railway(HSR) communication by exploiting some characteristic of the railway system including predetermined moving tracks and real-time positioning information. Moreover,for alleviating the effect of Doppler shift due to the moving train, a frequency offset precorrection method is also incorporated with direction beamforming. Theoretical Signalto-noise ratio(SNR) gain of the proposed beamforming scheme over traditional HSR communication schemes is also derived for illustrating the performance enhancement.Numerical results verify the effectiveness of our proposed scheme even with some kind of imperfect position information available at the transmitter.This paper considers a multi-antenna transmission strategy for high speed railway communica- tions. In order to achieve better performance than conven- tional space-frequency block coding schemes, we propose a directional beamforming strategy for the High-speed rail- way （HSR） communication by exploiting some characteris- tic of the railway system including predetermined moving tracks and real-time positioning information. Moreover, for alleviating the effect of Doppler shift due to the moving train, a frequency offset precorrection method is also incor- porated with direction beamforming. Theoretical Signal- to-noise ratio （SNR） gain of the proposed beamforming scheme over traditional HSR communication schemes is also derived for illustrating the performance enhancement. Numerical results verify the effectiveness of our proposed scheme even with some kind of imperfect position infor- mation available at the transmitter.

关 键 词：Multiple-input multiple-output （MIMO） Directional beamforming High-speed railway communica-tions Frequency offset precorrection. 

分 类 号：U285[交通运输工程—交通信息工程及控制]