725 citations · 3k across the 227 of their papers we have counts for
81 papers · 1 filter
Revolutionizing 6G Wireless Networks with RISs: Enhancements in Sensing and Communications
Jiguang He, Yuwen Cao, Charles Vanwynsberghe +5
Reconfigurable intelligent surfaces (RISs) have emerged as one of the most promising technologies for the next-generation wireless networks, offering advantages such as cost effici…
An Operational Leakage Metric for Eavesdropping in Joint Sensing and Communications Systems
Nanchi Su, Xiaoye Jing, Fan Liu +3
In upcoming integrated sensing and communications (ISAC) systems, security depends on whether an eavesdropper (Eve) can recover data symbols or infer sensing information from a com…
Cross-View Vision-Aided Proactive BS Selection and Beam Prediction for mmWave V2I Communications
Zijiao Hu, Haiyao Yu, Gaoyang Pang +6
This paper investigates environmental-sensing-aided proactive base station (BS) selection and beam prediction for millimeter-wave (mmWave) vehicle-to-infrastructure (V2I) wireless…
Uplink Channel Estimation for Multi-User MISO Systems Assisted by a Fluid Reconfigurable Intelligent Surface
Amarilton L. Magalhães, André L. F. de Almeida, George C. Alexandropoulos
Fluid reconfigurable intelligent surfaces (FRISs) have recently emerged as a promising paradigm for wireless communications, wherein the reflecting elements can dynamically select…
Control Plane for Reconfigurable Intelligent Surfaces
Fabio Saggese, Victor Croisfelt, Kyriakos Stylianopoulos +2
Research on reconfigurable intelligent surfaces (RISs) has predominantly focused on purely physical (PHY)-layer aspects, particularly, on how signals are dynamically shaped by a co…
Mismatch Analysis and Cooperative Calibration of Array Beam Patterns for ISAC Systems
Hui Chen, Mengting Li, Alireza Pourafzal +6
Integrated sensing and communication (ISAC) is a key technology for enabling a wide range of applications in future wireless systems. However, the sensing performance is often degr…
SORIS: A Self-Organized Reconfigurable Intelligent Surface Architecture for Wireless Communications
Evangelos Koutsonas, Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis +3
In this paper, a new reconfigurable intelligent surface (RIS) hardware architecture, called self-organized RIS (SORIS), is proposed. The architecture incorporates a microcontroller…
Decentralized Cooperative Beamforming for BDRIS-Assisted Cell-Free MIMO OFDM Systems
Konstantinos D. Katsanos, George C. Alexandropoulos
In this paper, a wideband cell-free multi-stream multi-user Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system is considered operating w…
Robust Consensus-Based Distributed Beamforming for Wideband Cell-free Multi-RIS MISO Systems
Konstantinos D. Katsanos, George C. Alexandropoulos
The cell-free networking paradigm constitutes a revolutionary architecture for future generations of wireless networks, which has been recently considered in synergy with Reconfigu…
Over-the-Air Goal-Oriented Communications
Kyriakos Stylianopoulos, Paolo Di Lorenzo, George C. Alexandropoulos
Goal-oriented communications offer an attractive alternative to the Shannon-based communication paradigm, where the data is never reconstructed at the Receiver (RX) side. Rather, f…
Over-the-Air Semantic Alignment with Stacked Intelligent Metasurfaces
Mario Edoardo Pandolfo, Kyriakos Stylianopoulos, George C. Alexandropoulos +1
Semantic communication systems aim to transmit task-relevant information between devices capable of artificial intelligence, but their performance can degrade when heterogeneous tr…
RIS-Aided Localization and Sensing
Dimitris Kompostiotis, Dimitris Vordonis, Konstantinos D. Katsanos +3
High-precision localization and environmental sensing are essential for a new wave of applications, ranging from industrial automation and autonomous systems to augmented reality a…
Sensing-Aided Near-Field Beam Tracking
Panagiotis Gavriilidis, George C. Alexandropoulos
The interplay between large antenna apertures and high carrier frequencies in future wireless systems gives rise to near-field communications, where the curvature of spherical wave…
Near-Field Multipath MIMO Channels: Modeling Reflectors and Exploiting NLOS Paths
Mohamadreza Delbari, George C. Alexandropoulos, Robert Schober +2
Near-field (NF) communications is receiving renewed interest in the context of multiple-input multiple-output (MIMO) systems involving large physical apertures with respect to the…
MIMO Communications with 1-bit RIS: Asymptotic Analysis and Over-the-Air Channel Diagonalization
Panagiotis Gavriilidis, Kyriakos Stylianopoulos, George C. Alexandropoulos
This paper presents an asymptotic analysis of Multiple-Input Multiple-Output (MIMO) systems assisted by a 1-bit Reconfigurable Intelligent Surface (RIS) under Ricean fading conditi…
AI-Aided Annealed Langevin Dynamics for Rapid Optimization of Programmable Channels
Tomer Shaked, Philipp del Hougne, George C. Alexandropoulos +1
Emerging technologies such as Reconfigurable Intelligent Surfaces (RIS) make it possible to optimize some parameters of wireless channels. Conventional approaches require relating…
Leaky Wave Antennas for Next Generation Wireless Applications in sub-THz Frequencies: Current Status and Research Challenges
Natalie Lang, Atsutse K. Kludze, Nir Shlezinger +4
The ever-growing demand for ultra-high data rates, massive connectivity, and joint communication-sensing capabilities in future wireless networks is driving research into sub-terah…
Hybrid RISs for Simultaneous Tunable Reflections and Sensing
George C. Alexandropoulos, Nir Shlezinger, Ioannis Gavras +1
The concept of smart wireless environments envisions dynamic programmable propagation of information-bearing signals through the deployment of Reconfigurable Intelligent Surfaces (…
Optimizing Indoor RIS-Aided Physical-Layer Security: A Codebook-Generation Methodology and Measurement-Based Analysis
Dimitris Kompostiotis, Dimitris Vordonis, Vassilis Paliouras +1
Sixth-Generation (6G) wireless networks aim to support innovative Internet-of-Things (IoT) applications that demand faster and more secure data transmission. While higher Open Syst…
Receiving RISs: Enabling Channel Estimation and Autonomous Configuration
George C. Alexandropoulos, Konstantinos D. Katsanos, Evangelos Vlachos
This chapter focuses on a hardware architecture for semi-passive Reconfigurable Intelligent Surfaces (RISs) and investigates its consideration for boosting the performance of Multi…
Distributed Intelligent Sensing and Communications for 6G: Architecture and Use Cases
Kyriakos Stylianopoulos, Giyyarpuram Madhusudan, Guillaume Jornod +8
The Distributed Intelligent Sensing and Communication (DISAC) framework redefines Integrated Sensing and Communication (ISAC) for 6G by leveraging distributed architectures to enha…
Blinding the Wiretapper: RIS-Enabled User Occultation in the ISAC Era
Getuar Rexhepi, Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu +1
An undesirable consequence of the foreseeable proliferation of sophisticated integrated sensing and communications (ISAC) technologies is the enabling of spoofing, by malicious age…
Universal Approximation with XL MIMO Systems: OTA Classification via Trainable Analog Combining
Kyriakos Stylianopoulos, George C. Alexandropoulos
In this paper, we show that an eXtremely Large (XL) Multiple-Input Multiple-Output (MIMO) wireless system with appropriate analog combining components exhibits the properties of a…
Active Reconfigurable Intelligent Surfaces: Circuit Modeling and Reflection Amplification Optimization
Panagiotis Gavriilidis, Deepak Mishra, Besma Smida +3
Reconfigurable Intelligent Surfaces (RISs) constitute a promising emerging technology that enables wireless systems to control the propagation environment to enhance diverse commun…