Research on Reliable Transmission Waveform and Performance Analysis of High-speed Railway Wireless Communication
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 varia-bility faced by wireless communication systems due to high-speed movement are analyzed.Based on orthogonal frequency divi-sion 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 en-vironment.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.
high-speed mobile communicationreliable transmission waveorthogonal frequency division multiplexingorthog-onal time frequency spacebit error rate
万方数据
维普
