64 citations · 258 across the 43 of their papers we have counts for
15 papers · 1 filter
Coalition Formation for Heterogeneous Federated Learning Enabled Channel Estimation in RIS-assisted Cell-free MIMO
Nan Qi, Haoxuan Liu, Theodoros A. Tsiftsis +4
Downlink channel estimation remains a significant bottleneck in reconfigurable intelligent surface-assisted cell-free multiple-input multiple-output communication systems. Conventi…
Active-RIS-Aided Covert Communications in NOMA-Inspired ISAC Wireless Systems
Miaomiao Zhu, Pengxu Chen, Liang Yang +3
Non-orthogonal multiple access (NOMA)-inspired integrated sensing and communication (ISAC) facilitates spectrum sharing for radar sensing and NOMA communications, whereas facing pr…
Power-Optimal HARQ Protocol for Reliable Free Space Optical Communication
Georgios D. Chondrogiannis, Nikos A. Mitsiou, Nestor D. Chatzidiamantis +2
This paper investigates the usage of hybrid automatic repeat request (HARQ) protocols for power-efficient and reliable communications over free space optical (FSO) links. By exploi…
On the Ergodic Secrecy Capacity of Reconfigurable Intelligent Surface Aided Wireless Systems Under Mixture Gamma Fading
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
This paper presents a quantified assessment of the physical layer security capabilities of reconfigurable intelligent surface (RIS)-aided wireless systems under eavesdropping. Spec…
Autonomous Reconfigurable Intelligent Surfaces Through Wireless Energy Harvesting
Konstantinos Ntontin, Alexandros-Apostolos A. Boulogeorgos, Emil Björnson +7
In this paper, we examine the potential for a reconfigurable intelligent surface (RIS) to be powered by energy harvested from information signals. This feature might be key to reap…
Reconfigurable Intelligent Surface Optimal Placement in Millimeter-Wave Networks
Konstantinos Ntontin, Alexandros-Apostolos A. Boulogeorgos, Dimitrios Selimis +3
This work discusses the optimal reconfigurable intelligent surface placement in highly-directional millimeter wave links. In particular, we present a novel system model that takes…
Analytical Performance Evaluation of Beamforming Under Transceivers Hardware Imperfections
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
In this paper, we provide the mathematical framework to evaluate and quantify the performance of wireless systems, which employ beamforming, in the presence of hardware imperfectio…
Analytical Performance Evaluation of THz Wireless Fiber Extenders
Alexandros-Apostolos A. Boulogeorgos, Evangelos N. Papasotiriou, Angeliki Alexiou
This paper presents the theoretical framework for the performance evaluation of terahertz (THz) wireless fiber extender in the presence of misalignment and multipath fading. In mor…
Ergodic capacity evaluation of wireless THz fiber extenders
Evangelos N. Papasotiriou, Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
This paper focuses on delivering quantified results for the evaluation of the aggregated impact of stochastic antenna misalignment, multipath fading and hardware imperfections on t…
Performance evaluation of THz wireless systems under the joint impact of misalignment fading and phase noise
Evangelos N. Papsotiriou, Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
In this paper, we investigate the joint impact of misalignment fading and local oscillator (LO) phase noise (PHN) in multi-carrier terahertz (THz) wireless systems. In more detail,…
Physical Layer Security in the Presence of Interference
Dimitrios S. Karas, Alexandros-Apostolos A. Boulogeorgos, George K. Karagiannidis
We evaluate and quantify the joint effect of fading and multiple interferers on the physical-layer (PHY) security of a system consisted of a base-station (BS), a legitimate user, a…
Spectrum Sensing with Multiple Primary Users over Fading Channels
Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis, George K. Karagiannidis
We investigate the impact of multiple primary users (PUs) and fading on the spectrum sensing of a classical energy detector (ED). Specifically, we present novel closed-form express…
Spectrum Sensing Under Hardware Constraints
Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis, George K. Karagiannidis
Direct-conversion radio (DCR) receivers can offer highly integrated low-cost hardware solutions for spectrum sensing in cognitive radio systems. However, DCR receivers are suscepti…
Securing the MIMO Wiretap Channel with Polar Codes and Encryption
Dimitrios S. Karas, Alexandros-Apostolos A. Boulogeorgos, Sotirios K. Mihos +2
Polar codes have been proven to be capacity achieving for any binary-input discrete memoryless channel, while at the same time they can reassure secure and reliable transmission ov…
I/Q-Imbalance Self-Interference Coordination
Alexandros-Apostolos A. Boulogeorgos, Vasileios M. Kapinas, George K. Karagiannidis +1
In this paper, we present a novel low-complexity scheme, which improves the performance of single-antenna multi-carrier communication systems, suffering from in-phase and quadratur…