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Efficient Doppler mitigation for high-speed rail communications

机译：高铁通信的有效多普勒缓解

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Since the high-speed rail (HSR) communications are suffering from the huge Doppler shift, an efficient Doppler mitigation method is proposed in this paper. The proposed method mainly concerns about the mitigation of Doppler shift in OFDM based systems, especially for the case of employing mmWave with very high mobility. The proposed method can be used for both downlink and uplink of the system and it is quite robust to the time-varying mobility. Furthermore, the pilot-aided channel estimation for Doppler compensation is not necessary in most of the cases, which indicates the pilot density in time-domain can be reduced. Simulation results show that by using the proposed method, the residual Doppler shift can be compressed to 0 Hz with the probability of 90%.
机译：由于高铁通信正遭受巨大的多普勒频移，因此本文提出了一种有效的多普勒缓解方法。所提出的方法主要涉及基于OFDM的系统中多普勒频移的减轻，特别是在采用具有很高移动性的mmWave的情况下。所提出的方法可以用于系统的下行链路和上行链路，并且对于时变移动性是相当鲁棒的。此外，在大多数情况下，不需要用于多普勒补偿的导频辅助信道估计，这表明可以降低时域中的导频密度。仿真结果表明，该方法可以将剩余的多普勒频移压缩到0 Hz，概率为90％。

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