Spectral Efficiency Optimization for Hybrid Relay-Reflecting Intelligent Surface [PDF]
, 2021 We propose a novel concept of hybrid relay-reflecting intelligent surface (HR-RIS), in which a single or few elements are deployed with power amplifiers (PAs) to serve as active relays, while the remaining elements only reflect the incident signals.
Juntti, Markku +3 more
core +1 more source
Hybrid Active–Passive Reconfigurable Intelligent Surface for Cooperative Transmission Systems
Applied Sciences, 2023 Reconfigurable intelligent surfaces (RISs) are acknowledged as one of the key technologies for the next-generation communication systems due to their low cost, high-energy efficiency, and the ability to intelligently control the wireless propagation ...
Wenhe Wang, Kang Song
doaj +1 more source
Corrections to “WiThRay: A Versatile Ray-Tracing Simulator for Smart Wireless Environments”
IEEE Access, 2023 In the above article [1], the reconfigurable intelligent surface (RIS) response model in (17) needs to be modified as follows:
Hyuckjin Choi +4 more
doaj +1 more source
On the performance of reconfigurable intelligent surface-assisted UAV-to-ground communication systems [PDF]
, 2023 In this study, to reduce the average symbol error rate, and improve coverage and reliability of unmanned aerial vehicles (UAVs) to ground communication systems.
Ai, Duong Huu +3 more
core +2 more sources
STAR‐RIS‐assisted scheme for enhancing physical layer security in NOMA systems
IET Communications, 2022 Simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR‐RIS) is capable of achieving full coverage area compared with conventional reflection‐only reconfigurable intelligent surface (RIS).
Shu Xu +4 more
doaj +1 more source
Energy efficiency maximisation for STAR‐RIS assisted full‐duplex communications
IET Communications, 2023 Reconfigurable intelligent surface (RIS) has emerged as a promising technique for enhancing the performance of wireless networks. However, the traditional reflecting‐only RIS requires that the transmitter and receiver ought to be on the same side of the ...
Pengxin Guan +3 more
doaj +1 more source
IEEE Access, 2022 Reconfigurable intelligent surface (RIS) has been proven to be a promising technology for improving the performance of future wireless systems. However, since conventional RIS can only reflect or transmit (i.e., refract) incident signals, it limits the ...
Yiru Wang +3 more
doaj +1 more source
MIMO Evolution Beyond 5G Through Reconfigurable Intelligent Surfaces and Fluid Antenna Systems [PDF]
, 2022 With massive deployment, multiple-input–multiple-output (MIMO) systems continue to take mobile communications to new heights, but the ever-increasing demands mean that there is a need to look beyond MIMO and pursue the next disruptive wireless ...
Chu, Zhiyuan +9 more
core +1 more source
Hybrid Precoding Applied to Multi-Beam Transmitting Reconfigurable Intelligent Surfaces (T-RIS)
Electronics, 2023 In this work, we study hybrid precoding techniques applied to multi-user Transmitting Reconfigurable Intelligent Surface (T-RIS) systems. The T-RIS considered here is a large array of electronically reconfigurable antenna elements illuminated by a small set of active sources.
David Demmer +6 more
openaire +2 more sources
A Review of Phase-Change Materials and Their Potential for Reconfigurable Intelligent Surfaces
Micromachines, 2023 Phase-change materials (PCMs) and metal-insulator transition (MIT) materials have the unique feature of changing their material phase through external excitations such as conductive heating, optical stimulation, or the application of electric or magnetic
Randy Matos, Nezih Pala
doaj +1 more source