Paper Info
Title
Reconfigurable Intelligent Surfaces For Smart Wireless Environments: Channel Estimation, System Design And Applications In 6g Networks
Abstract
Reconfigurable intelligent surface (RIS), one of the key enablers for the sixth-generation (6G) mobile communication networks, is considered by designers to smartly reconfigure the wireless propagation environment in a controllable and programmable manner. Specifically, an RIS consists of a large number of low-cost and passive reflective elements (REs) without radio frequency chains. The system gain of RIS wireless systems can be achieved by adjusting the phase shifts and amplitudes of the REs so that the desired signals can be added constructively at the receiver. However, an RIS typically has limited signal processing capability and cannot perform active transmitting/receiving in general, which leads to new challenges in the physical layer design of RIS wireless systems. In this paper, we provide an overview of the RIS-aided wireless systems, including the reflection principle, channel estimation, and system design. In particular, two types of emerging RIS systems are considered: RIS-aided wireless communications (RAWC) and RIS-based information transmission (RBIT), where the RIS plays the role of the reflector and the transmitter, respectively. We also envision the potential applications of RIS in 6G networks.
Year
DOI
Venue
2021
10.1007/s11432-020-3261-5
SCIENCE CHINA-INFORMATION SCIENCES
Keywords
DocType
Volume
reconfigurable intelligent surface, channel estimation, RIS-aided wireless communications, RIS-based information transmission, 6G
Journal
64
Issue
ISSN
Citations 
10
1674-733X
4
PageRank 
References 
Authors
0.39
0
9
Name
Order
Citations
PageRank
Liang Ying-Chang110007593.03
Jie Chen240.39
Ruizhe Long3223.36
Zhen-Qing He41458.32
Xianqi Lin540.39
Chenlu Huang640.39
Shi-Lin Liu7302.77
Xuemin Sherman Shen8136.97
Marco Di Renzo94721269.75