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Ensuring the precision of channel modeling plays a pivotal role in the development of wireless communication systems, and this requirement remains a persistent challenge within the realm of networks supported by Reconfigurable Intelligent…

A reconfigurable intelligent surface (RIS) can shape the radio propagation by passively changing the directions of impinging electromagnetic waves. The optimal control of the RIS requires perfect channel state information (CSI) of all the…

信号处理 · 电气工程与系统科学 2020-02-18 Jiguang He , Markus Leinonen , Henk Wymeersch , Markku Juntti

A reconfigurable intelligent surface (RIS) can shape the radio propagation environment by virtue of changing the impinging electromagnetic waves towards any desired directions, thus, breaking the general Snell's reflection law. However, the…

信号处理 · 电气工程与系统科学 2021-01-15 Jiguang He , Henk Wymeersch , Markku Juntti

Recent research has focused on reconfigurable intelligent surface (RIS)-assisted cell-free systems with the goal of enhancing coverage and lowering the cost of cell-free networks. However, current research makes the assumption that the…

信号处理 · 电气工程与系统科学 2022-07-29 Songjie Yang , Chenfei Xie , Mingwei Wang , Zhongpei Zhang

The technology of Reconfigurable Intelligent Surfaces (RISs) is lately being considered as a boosting component for various indoor wireless applications, enabling wave propagation control and coverage extension. However, the incorporation…

信息论 · 计算机科学 2025-01-23 Fabio Cardoso , Sérgio Matos , Luís M. Pessoa , George C. Alexandropoulos

Reconfigurable intelligent surface (RIS) has been widely discussed as new technology to improve wireless communication performance. Based on the unique design of RIS, its elements can reflect, refract, absorb, or focus the incoming waves…

信号处理 · 电气工程与系统科学 2020-09-03 Salah Eddine Zegrar , Liza Afeef , Huseyin Arslan

The march towards 6G is accelerating and future wireless network architectures require enhanced performance along with significant coverage especially, to combat impairments on account of the wireless channel. Reconfigurable intelligent…

信号处理 · 电气工程与系统科学 2023-08-16 Emre Arslan , Fatih Kilinc , Ertugrul Basar , Huseyin Arslan

Reconfigurable intelligent surface (RIS) has recently gained significant interest as an emerging technology for future wireless networks thanks to its potential for improving the coverage probability in challenging propagation environments.…

信息论 · 计算机科学 2023-09-08 Trinh Van Chien , Lam Thanh Tu , Waqas Khalid , Heejung Yu , Symeon Chatzinotas , Marco Di Renzo

Reconfigurable intelligent surfaces (RISs) comprised of tunable unit cells have recently drawn significant attention due to their superior capability in manipulating electromagnetic waves. In particular, RIS-assisted wireless communications…

信号处理 · 电气工程与系统科学 2020-10-16 Wankai Tang , Ming Zheng Chen , Xiangyu Chen , Jun Yan Dai , Yu Han , Marco Di Renzo , Yong Zeng , Shi Jin , Qiang Cheng , Tie Jun Cui

Existing works mainly rely on the far-field planar-wave-based channel model to assess the performance of reconfigurable intelligent surface (RIS)-enabled wireless communication systems. However, when the transmitter and receiver are in…

信号处理 · 电气工程与系统科学 2024-03-20 Hao Jiang , Wangqi Shi , Zaichen Zhang , Cunhua Pan , Qingqing Wu , Feng Shu , Ruiqi Liu , Jiangzhou Wang

Reconfigurable intelligent surfaces (RISs) consist of many passive elements of metamaterials whose impedance can be controllable to change the characteristics of wireless signals impinging on them. Channel estimation is a critical task when…

信息论 · 计算机科学 2023-09-14 Özlem Tuğfe Demir , Emil Björnson

Reconfigurable intelligent surface (RIS) is a promising candidate technology for the upcoming Sixth Generation (6G) communication system for its ability to manipulate the wireless communication environment by controlling the coefficients of…

信息论 · 计算机科学 2023-09-29 Haochen Li , Zhiwen Pan , Bin Wang , Nan Liu , Xiaohu You

While the researchers have set their sights on future wireless networks of 2030, communications through reconfigurable intelligent surfaces (RISs) appears as one of the potential enabling technologies for 6G wireless networking. This…

信息论 · 计算机科学 2021-03-05 E. Basar , I. Yildirim

The reconfigurable intelligent surface (RIS) technology is a potential solution to enhance network capacity and coverage without significant investment in additional infrastructure in 6G networks. This work highlights the interest of the…

Reconfigurable intelligent surfaces (RISs) have attracted great attention as a potential beyond 5G technology. These surfaces consist of many passive elements of metamaterials whose impedance can be controllable to change the phase,…

信息论 · 计算机科学 2021-09-09 Özlem Tuğfe Demir , Emil Björnson

Intelligent surfaces comprising of cost effective, nearly passive, and reconfigurable unit elements are lately gaining increasing interest due to their potential in enabling fully programmable wireless environments. They are envisioned to…

信息论 · 计算机科学 2022-05-26 George C. Alexandropoulos , Evangelos Vlachos

Reconfigurable intelligent surface (RIS)-aided near-field communications is investigated. First, the necessity of investigating RIS-aided near-field communications and the advantages brought about by the unique spherical-wave-based…

信息论 · 计算机科学 2024-03-05 Xidong Mu , Jiaqi Xu , Yuanwei Liu , Lajos Hanzo

The performance characterization of communication systems assisted by large reconfigurable intelligent surfaces (RISs) significantly depends on the adopted models for the underlying channels. Under unrealistic channel models, the system…

信号处理 · 电气工程与系统科学 2023-01-18 Vahid Jamali , Walid Ghanem , Robert Schober , H. Vincent Poor

Reconfigurable intelligent surface (RIS) is an emerging technology for wireless communications. In this paper, extensive system level simulations are conducted for analyzing the performance of multi-RIS and multi-base-station (BS)…

信息论 · 计算机科学 2025-02-11 Yifei Yuan , Yuhong Huang , Xin Su , Boyang Duan , Nan Hu , Marco Di Renzo

Reconfigurable intelligent surfaces (RIS) are passive controllable arrays of small reflectors that direct electromagnetic energy towards or away from the target nodes, thereby allowing better management of signals and interference in a…

信息论 · 计算机科学 2023-01-13 Bharath Shamasundar , Negar Daryanavardan , Aria Nosratinia