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针对时变信道下的OFDM系统的性能分析,通常采用信道在一个符号持续时间内保持不变的假设为前提。然而,这种假设在某些情况下并不合理。随着载波频率的提高,终端移动速度的加快以及符号长度的增加,由多普勒效应导致的载波间的串扰变得更加严重。本文分析了多普勒效应对最大可传送速率和信干比的影响,并且分别设计了使信干比和最大可传送速率最大化的符号长度。数值仿真结果进一步证实了作者的理论结果。
For the performance analysis of OFDM systems under time-varying channels, it is usually assumed that the channel remains unchanged for one symbol duration. However, this assumption is not reasonable in some cases. As the carrier frequency increases, the terminal moves faster and the symbol length increases, crosstalk between carriers caused by the Doppler effect becomes more severe. This paper analyzes the effect of Doppler effect on the maximum transmittable rate and the signal to interference ratio, and designs the symbol length that maximizes the signal to interference ratio and the maximum transmittable rate respectively. Numerical simulation results further confirm the author’s theoretical results.