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.
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
Key words
high-speed mobile communication/reliable transmission wave/orthogonal frequency division multiplexing/orthog-onal time frequency space/bit error rate
维普
万方数据