High-speed train (HST) communication is a very challenging scenario in wireless communication systems due to its fast time-varying channels and significant penetration loss. Thanks to the low cost and smart channel reconfiguration ability, reconfigurable intelligent surface (RIS) has been proposed as a promising technology to solve the aforementioned challenges cost-effectively and to achieve high spectral and energy-efficiency in the next-generation HST communication systems. In this article, we first provide a novel RIS-aided HST wireless communication paradigm, including its main challenges and application scenarios. Then, we propose practical solutions are provided to realize efficient signal processing and resource management in the considered system. Finally, future directions of RIS-aided HST communication systems are pointed out to inspire further investigation in future work.

翻译：高速列车(HST)通信是无线通信系统的一个极具挑战性的情景,原因是其时间变化很快,渗透性损失巨大,由于低成本和智能频道重组能力,人们提议重新配置智能表面(RIS),作为一种大有希望的技术,以具有成本效益的方式解决上述挑战,并在下一代HST通信系统中实现高光谱和高能效。在这一条中,我们首先提供了新型的RIS辅助的HST无线通信模式,包括其主要挑战和应用方案。然后,我们提出了切实可行的解决办法,以便在考虑的系统中实现高效的信号处理和资源管理。最后,指出由RIS辅助的HST通信系统的未来方向,激励未来工作的进一步调查。