RIS-Aided Next-Generation High-Speed Train Communications: Challenges, Solutions, and Future Directions

TL;DR

This paper explores the integration of reconfigurable intelligent surfaces (RIS) into high-speed train communications, addressing challenges like fast channel variation and penetration loss, and proposing solutions for efficient signal processing and resource management.

Contribution

It introduces a novel RIS-aided HST communication paradigm, discusses its challenges, and outlines practical solutions and future research directions.

Findings

RIS can improve spectral and energy efficiency in HST systems

Proposed solutions enhance signal processing and resource management

Future directions aim to inspire further research

Abstract

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.