论文标题
RIS辅助毫米波系统的光束训练和对齐
Beam Training and Alignment for RIS-Assisted Millimeter Wave Systems:State of the Art and Beyond
论文作者
论文摘要
可重构的智能表面（RIS）最近成为未来蜂窝网络的有希望的范式。具体而言，由于其重塑繁殖环境的能力，RI被引入以解决毫米波（MMWave）甚至Terahertz（THZ）通信中的阻塞问题。但是，RIS的部署使系统体系结构变得复杂，并对光束训练（BT）/梁对准（BA）构成了重大挑战，该过程是建立发射器和接收器之间可靠链接所需的过程。在本文中，我们首先回顾了针对RIS辅助MMWave系统的几种最先进的光束训练解决方案，并讨论了它们各自的优势和局限性。我们还提出了一种新的多向BT方法，该方法只能通过少量的培训开销来实现不错的BA性能。最后，我们概述了RIS辅助MMWave系统的BT中的几个重要开放问题。
Reconfigurable intelligent surface (RIS) has recently emerged as a promising paradigm for future cellular networks. Specifically, due to its capability in reshaping the propagation environment, RIS was introduced to address the blockage issue in millimeter Wave (mmWave) or even Terahertz (THz) communications. The deployment of RIS, however, complicates the system architecture and poses a significant challenge for beam training (BT)/ beam alignment (BA), a process that is required to establish a reliable link between the transmitter and the receiver. In this article, we first review several state-of-the-art beam training solutions for RIS-assisted mmWave systems and discuss their respective advantages and limitations. We also present a new multi-directional BT method, which can achieve a decent BA performance with only a small amount of training overhead. Finally, we outline several important open issues in BT for RIS-assisted mmWave systems.
