725 citations · 3k across the 227 of their papers we have counts for
15 papers · 1 filter
Hybrid RIS-Empowered Reflection and Decode-and-Forward Relaying for Coverage Extension
Ibrahim Yildirim, Fatih Kilinc, Ertugrul Basar +1
In this letter, we introduce two hybrid transmission schemes combining a passive reconfigurable intelligent surface (RIS) with decode-and-forward relaying in a synergistic manner.…
Joint Channel Estimation and Signal Recovery in RIS-Assisted Multi-User MISO Communications
Li Wei, Chongwen Huang, George C. Alexandropoulos +3
Reconfigurable Intelligent Surfaces (RISs) have been recently considered as an energy-efficient solution for future wireless networks. Their dynamic and low-power configuration ena…
Simultaneous Data Communication and Channel Estimation in Multi-User Full Duplex MIMO Systems
Md Atiqul Islam, George C. Alexandropoulos, Besma Smida
In this paper, we study Simultaneous Communication of Data and Control (SCDC) information signals in Full Duplex (FD) Multiple-Input Multiple-Output (MIMO) wireless systems. In par…
Near-field Localization with a Reconfigurable Intelligent Surface Acting as Lens
Zohair Abu-Shaban, Kamran Keykhosravi, Musa Furkan Keskin +3
Exploiting wavefront curvature enables localization with limited infrastructure and hardware complexity. With the introduction of reconfigurable intelligent surfaces (RISs), new op…
Phase Configuration Learning in Wireless Networks with Multiple Reconfigurable Intelligent Surfaces
George C. Alexandropoulos, Sumudu Samarakoon, Mehdi Bennis +1
Reconfigurable Intelligent Surfaces (RISs) are recently gaining remarkable attention as a low-cost, hardware-efficient, and highly scalable technology capable of offering dynamic c…
Hybrid Beamforming for RIS-Empowered Multi-hop Terahertz Communications: A DRL-based Method
Chongwen Huang, Zhaohui Yang, George C. Alexandropoulos +4
Wireless communication in the TeraHertz band (0.1--10 THz) is envisioned as one of the key enabling technologies for the future six generation (6G) wireless communication systems.…
Reconfigurable Intelligent Surfaces with Reflection Pattern Modulation: Beamforming Design and Performance Analysis
Shaoe Lin, Beixiong Zheng, George C. Alexandropoulos +3
Recent considerations for reconfigurable intelligent surfaces (RISs) assume that RISs can convey information by reflection without the need of transmit radio frequency chains, whic…
Channel Estimation for RIS-Empowered Multi-User MISO Wireless Communications
Li Wei, Chongwen Huang, George C. Alexandropoulos +3
Reconfigurable Intelligent Surfaces (RISs) have been recently considered as an energy-efficient solution for future wireless networks due to their fast and low-power configuration,…
Reconfigurable Intelligent Surfaces and Metamaterials: The Potential of Wave Propagation Control for 6G Wireless Communications
George C. Alexandropoulos, Geoffroy Lerosey, Merouane Debbah +1
The future 6G of wireless communication networks will have to meet multiple requirements in increasingly demanding levels, either individually or in combinations in small groups. T…
Dynamic Metasurface Antennas for 6G Extreme Massive MIMO Communications
Nir Shlezinger, George C. Alexandropoulos, Mohammadreza F. Imani +2
Next generation wireless base stations and access points will transmit and receive using extremely massive numbers of antennas. A promising technology for realizing such massive ar…
Safeguarding MIMO Communications with Reconfigurable Metasurfaces and Artificial Noise
George C. Alexandropoulos, Konstantinos Katsanos, Miaowen Wen +1
Wireless communications empowered by Reconfigurable Intelligent (meta)Surfaces (RISs) are recently gaining remarkable research attention due to the increased system design flexibil…
Simultaneous Downlink Data Transmission and Uplink Channel Estimation with Reduced Complexity Full Duplex MIMO Radios
Md Atiqul Islam, George C. Alexandropoulos, Besma Smida
In this paper, we study Full Duplex (FD) Multiple-Input Multiple-Output (MIMO) radios for simultaneous data communication and control information exchange. Capitalizing on a recent…
Full Duplex Hybrid A/D Beamforming with Reduced Complexity Multi-Tap Analog Cancellation
George C. Alexandropoulos, Md Atiqul Islam, Besma Smida
Although the hardware complexity of the analog self-interference canceller in full duplex Multiple Input Multiple Output (MIMO) designs does not necessarily scale with the number o…
A Hardware Architecture for Reconfigurable Intelligent Surfaces with Minimal Active Elements for Explicit Channel Estimation
George C. Alexandropoulos, Evangelos Vlachos
Intelligent surfaces comprising of cost effective, nearly passive, and reconfigurable unit elements are lately gaining increasing interest due to their potential in enabling fully…
Parallel Factor Decomposition Channel Estimation in RIS-Assisted Multi-User MISO Communication
Li Wei, Chongwen Huang, George C. Alexandropoulos +1
Reconfigurable Intelligent Surfaces (RISs) have been recently considered as an energy-efficient solution for future wireless networks due to their fast and low power configuration…