Reconfigurable intelligent surfaces for wireless communications:Overview of hardware designs,channel models,and estimation techniques

作     者：Mengnan Jian George C.Alexandropoulos Ertugrul Basar Chongwen Huang Ruiqi Liu Yuanwei Liu Chau Yuen 

作者机构：the Wireless Research InstituteZTE CorporationBeijing 100029China the State Key Laboratory of Mobile Network and Mobile Multimedia TechnologyShenzhen 518055China Department of Informatics and TelecommunicationsNational and Kapodistrian University of AthensAthens 15784Greece Communications Research and Innovation Laboratory(CoreLab)Department of Electrical and Electronics EngineeringKoçUniversityIstanbul 34450Turkey College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China School of Electronic Engineering and Computer ScienceQueen Mary University of LondonLondonE14NSUK. the Engineering Product Development(EPD)PillarSingapore University of Technology and DesignSingapore 487372Singapore 

出 版 物：《Intelligent and Converged Networks》 (智能与融合网络（英文）)

年 卷 期：2022年第3卷第1期

页      面：1-32页

核心收录：

学科分类：0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0835[工学-软件工程] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the EU H2020 Industrial Leadership Project(No.101017011) the Scientific and Technological Research Council of Turkey(TUBITAK)(No.120E401). 

主　　题：reconfigurable intelligent surfaces beyond 5G 6G channel modeling hardware architecture channel estimation smart wireless environment standardization 

摘      要：The demanding objectives for the future sixth generation(6G)of wireless communication networks have spurred recent research efforts on novel materials and radio-frequency front-end architectures for wireless connectivity,as well as revolutionary communication and computing paradigms.Among the pioneering candidate technologies for 6G belong the reconfigurable intelligent surfaces(RISs),which are artificial planar structures with integrated electronic circuits that can be programmed to manipulate the incoming electromagnetic field in a wide variety of functionalities.Incorporating RISs in wireless networks have been recently advocated as a revolutionary means to transform any wireless signal propagation environment to a dynamically programmable one,intended for various networking objectives,such as coverage extension and capacity boosting,spatiotemporal focusing with benefits in energy efficiency and secrecy,and low electromagnetic field exposure.Motivated by the recent increasing interests in the field of RISs and the consequent pioneering concept of the RIS-enabled smart wireless environments,in this paper,we overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation.We also present a thorough overview of the channel estimation approaches for RIS-empowered communications systems,which constitute a prerequisite step for the optimized incorporation of RISs in future wireless networks.Finally,we discuss the relevance of the RIS technology in the latest wireless communication standards,and highlight the current and future standardization activities for the RIS technology and the consequent RIS-empowered wireless networking approaches.