Details

Autor(en) / Beteiligte

• Liang, Ying-Chang
• Chen, Jie
• Long, Ruizhe
• He, Zhen-Qing
• Lin, Xianqi
• Huang, Chenlu
• Liu, Shilin
• Shen, Xuemin Sherman
• Di Renzo, Marco

Titel

Reconfigurable intelligent surfaces for smart wireless environments: channel estimation, system design and applications in 6G networks

Ist Teil von

• Science China. Information sciences, 2021-10, Vol.64 (10), p.200301, Article 200301

Ort / Verlag

Beijing: Science China Press

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.