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Simultaneous Secure Communications and Sensing Privacy with Full Duplex MIMO Radios
Ioannis Gavras, George C. Alexandropoulos
This paper proposes a Full Duplex (FD) framework for safeguarding Integrated Sensing and Communications (ISAC) against a passive multi-antenna Eavesdropper (Eve). The adversary is…
Wideband Sensing with Dynamic Metasurface Antennas under Realistic Phase Response Modeling
Ioannis Gavras, George C. Alexandropoulos
This paper investigates the impact of practical features of the emerging antenna array technology of Dynamic Metasurface Antennas (DMAs) when used for wideband sensing. By adopting…
RIS-Enabled Spoofing Against Adversary Sensing: CRB-Maximizing Design and Decoying Analysis
Ioannis Gavras, Giuseppe Thadeu Freitas de Abreu, George C. Alexandropoulos
This paper studies the capability of a Reconfigurable Intelligent Surface (RIS), when transparently covering a User Equipment (UE), to deceive an adversary monostatic radar system.…
RIS-Enabled Smart Wireless Environments: Fundamentals and Distributed Optimization
George C. Alexandropoulos, Kostantinos D. Katsanos, George Stamatelis +1
This chapter overviews the concept of Smart Wireless Environments (SWEs) motivated by the emerging technology of Reconfigurable Intelligent Surfaces (RISs). The operating principle…
2D Waveguide-Fed Metasurface Antenna Arrays: Modeling and Optimization for Bistatic Sensing
Ioannis Gavras, Panagiotis Gavriilidis, George C. Alexandropoulos
This paper presents a physics-consistent framework for bistatic sensing incorporating a 2-Dimensional (2D) waveguide-fed metasurface antenna array capable of realizing eXtremely-La…
Electromagnetics-Compliant Optimization of Dynamic Metasurface Antennas for Bistatic Sensing
Ioannis Gavras, George C. Alexandropoulos
Dynamic Metasurface Antennas (DMAs) are recently attracting considerable research interests due to their potential to enable low-cost, reconfigurable, and highly scalable antenna a…
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 (…
Communications-Centric Secure ISAC with Hybrid Reconfigurable Intelligent Surfaces
Ioannis Gavras, George C. Alexandropoulos
Hybrid reconfigurable intelligent surfaces (HRISs) constitute an emerging paradigm of metasurfaces that empowers the concept of smart wireless environments, inherently supporting s…
Tracking-Aided Multi-User MIMO Communications with Hybrid Reconfigurable Intelligent Surfaces
Ioannis Gavras, George C. Alexandropoulos
Hybrid Reconfigurable Intelligent Surfaces (HRISs) constitute a new paradigm that redefines smart metasurfaces, not only offering tunable reflections of incoming signals, but also…
DMA Reception for Simultaneous Area-Wide Sensing and Multi-User Uplink Communications
Ioannis Gavras, George C. Alexandropoulos
The recent surge in deploying extremely large antenna arrays is expected to play a vital role in future sixth generation wireless networks, enabling advanced radar target localizat…
Near-Field Localization with Dynamic Metasurface Antennas at THz: A CRB Minimizing Approach
Ioannis Gavras, George C. Alexandropoulos
The recent trend for extremely massive antenna arrays and high frequencies facilitates localization and sensing, offering increased angular and range resolution. In this letter, we…
Circuit-Compliant Optimization of Dynamic Metasurface Antennas for Near-Field Localization
Ioannis Gavras, George C. Alexandropoulos
This paper presents an optimization framework for near-field localization with Dynamic Metasurface Antenna (DMA) receivers. This metasurface technology offers enhanced angular and…
Simultaneous Communications and Sensing with Hybrid Reconfigurable Intelligent Surfaces
Ioannis Gavras, George C. Alexandropoulos
Hybrid Reconfigurable Intelligent Surfaces (HRISs) constitute a new paradigm of truly smart metasurfaces with the additional features of signal reception and processing, which have…
Simultaneous Near-Field THz Communications and Sensing with Full Duplex Metasurface Transceivers
Ioannis Gavras, George C. Alexandropoulos
In this paper, a Full Duplex (FD) eXtremely Large (XL) Multiple-Input Multiple-Output (MIMO) node equipped with reconfigurable metasurface antennas at its transmission and receptio…