高铁无线通信可靠传输波形研究与性能分析  

Research on Reliable Transmission Waveform and Performance Analysisof High-speed Railway Wireless Communication

作　　者：虞梦月 YU Mengyue(School of Traction Power,Xi’an Railway Vocational&Technical Institute,Xi’an 710026,China)

机构地区：[1]西安铁路职业技术学院,牵引动力学院,陕西西安710026

出　　处：《微型电脑应用》2024年第8期51-55,共5页Microcomputer Applications

基　　金：陕西省“十四五”教育科学规划课题(SGH22Q207);西安铁路职业技术学院院级课题(XTZY23K14)。

摘　　要：针对高速铁路应用中高动态环境大容量信息可靠传输能力提升的需求,通过分析无线通信系统因高速移动而面临的多径衰落、多普勒效应以及信道时变性等传输环境因素,分别基于正交频分复用(OFDM)和正交时频空(OTFS)设计高速铁路应用场景下的无线通信传输波形,并通过搭建模拟高速移动传输环境开展对2种传输波形在多参数可变条件下传输误码率的性能仿真实验。仿真结果证明,在120 km/h、360 km/h和500 km/h的场景下达到相同传输误码率时,所设计的OTFS传输波形比OFDM传输波形对信噪比需求分别降低了6 dB、8 dB和12 dB,表明基于OTFS的传输波形在多径时延拓展和多普勒偏移较大的情况下仍能够较好抑制快时变信道带来的衰落,实现了更可靠的数据传输。In order to improve the reliable transmission capability of large-capacity information in the high-dynamic environment of high-speed railway,the transmission environmental factors such as multi-path fading,Doppler effect and channel time variability faced by wireless communication systems due to high-speed movement are analyzed.Based on orthogonal frequency division multiplexing(OFDM)and orthogonal time frequency space(OTFS),the wireless communication transmission waveform in the application scenario of high-speed railway is designed.The simulation experiment of the bit error rate of two transmission waveforms under multi-parameter variable condition is carried out by setting up a simulated high-speed mobile transmission environment.The simulation results show that when the same bit error rate is achieved at 120 km/h,360 km/h and 500 km/h,the designed OTFS transmission waveform reduces the signal-to-noise ratio by 6 dB,8 dB and 12 dB,respectively,compared with the OFDM transmission waveform.It is shown that the OTFS-based transmission waveform can suppress the fading caused by the fast time-varying channel well and realize more reliable data transmission under the condition of multi-path delay expansion and Doppler shift.

关 键 词：高速移动通信 可靠传输波 正交频分复用 正交时频空 传输误码率 

分 类 号：TN915.852[电子电信—通信与信息系统]