TY - JOUR
T1 - Beam Training and Alignment for RIS-Assisted Millimeter-Wave Systems
T2 - State of the Art and Beyond
AU - Wang, Peilan
AU - Fang, Jun
AU - Zhang, Weizheng
AU - Chen, Zhi
AU - Li, Hongbin
AU - Zhang, Wei
N1 - Publisher Copyright:
© 2002-2012 IEEE.
PY - 2022/12/1
Y1 - 2022/12/1
N2 - 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 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 multidirectional BT method, which can achieve 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.
AB - 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 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 multidirectional BT method, which can achieve 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.
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U2 - 10.1109/MWC.006.2100517
DO - 10.1109/MWC.006.2100517
M3 - Article
AN - SCOPUS:85132538623
SN - 1536-1284
VL - 29
SP - 64
EP - 71
JO - IEEE Wireless Communications
JF - IEEE Wireless Communications
IS - 6
ER -