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

M Jian, GC Alexandropoulos, E Basar… - Intelligent and …, 2022 - ieeexplore.ieee.org
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 …

Pervasive machine learning for smart radio environments enabled by reconfigurable intelligent surfaces

GC Alexandropoulos, K Stylianopoulos… - Proceedings of the …, 2022 - ieeexplore.ieee.org
The emerging technology of reconfigurable intelligent surfaces (RISs) is provisioned as an
enabler of smart wireless environments, offering a highly scalable, low-cost, hardware …

A reconfigurable intelligent surface with integrated sensing capability

I Alamzadeh, GC Alexandropoulos, N Shlezinger… - Scientific reports, 2021 - nature.com
Reconfigurable reflective surfaces can alter the propagation environment to improve
wireless communication and power transfer. Paramount to this operation—which has …

Channel estimation with hybrid reconfigurable intelligent metasurfaces

H Zhang, N Shlezinger… - IEEE transactions on …, 2023 - ieeexplore.ieee.org
Reconfigurable Intelligent Surfaces (RISs) are envisioned to play a key role in future
wireless communications, enabling programmable radio propagation environments. They …

Hybrid reinforcement learning for STAR-RISs: A coupled phase-shift model based beamformer

R Zhong, Y Liu, X Mu, Y Chen, X Wang… - IEEE Journal on …, 2022 - ieeexplore.ieee.org
A simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)
assisted multi-user downlink multiple-input single-output (MISO) communication system is …

Applications of absorptive reconfigurable intelligent surfaces in interference mitigation and physical layer security

F Wang, AL Swindlehurst - IEEE Transactions on Wireless …, 2023 - ieeexplore.ieee.org
This paper explores the use of reconfigurable intelligent surfaces (RIS) in mitigating cross-
system interference in spectrum sharing and secure wireless applications. Unlike …

Transmit power minimization for STAR-RIS-empowered uplink NOMA system

H Ma, H Wang, H Li, Y Feng - IEEE Wireless Communications …, 2022 - ieeexplore.ieee.org
Different from conventional reconfigurable intelligent surface, simultaneously transmitting
and reflecting reconfigurable intelligent surface (STAR-RIS) can provide service for the …

Hybrid reconfigurable intelligent surfaces-assisted near-field localization

X Zhang, H Zhang - IEEE Communications Letters, 2022 - ieeexplore.ieee.org
Reconfigurable intelligent metasurface (RIS) assisted user localization has been a hot topic
along with the development of the sixth generation wireless communications. The …

CSI acquisition in RIS-assisted mobile communication systems

Y Han, W Tang, X Li, M Matthaiou… - National Science …, 2023 - academic.oup.com
Reconfigurable intelligent surface-(RIS) assisted mobile communication is a promising
technological paradigm thanks to the attractive advantages of low cost and flexible control of …

Sensing and reconfigurable reflection of electromagnetic waves from a metasurface with sparse sensing elements

I Alamzadeh, MF Imani - IEEE Access, 2022 - ieeexplore.ieee.org
Reconfigurable reflective surfaces can form prescribed radiation patterns given a known
incident signal, a capability with widespread use for beamforming in radar and imaging …