64 citations · 258 across the 43 of their papers we have counts for
22 papers · 1 filter
Reliable ORIS-assisted FSO Communications via HARQ
Georgios D. Chondrogiannis, Athanasios P. Chrysologou, Vasilis K. Papanikolaou +3
This paper studies a free-space optical (FSO) link assisted by an optical reconfigurable intelligent surface (ORIS) and enhanced by a hybrid automatic repeat request (HARQ) scheme.…
On the Performance of THz Wireless Systems over - Channels with Beam Misalignment, Mobility and Hardware Impairments
Wamberto J. L. Queiroz, Higo T. P. Silva, Hugerles S. Silva +1
This paper investigates the performance of terahertz (THz) wireless systems over the - fading channels with beam misalignment, mobility and hardware impairments. Ne…
Spiking Neural Networks for Resource Allocation in UAV-Enabled Wireless Networks
Vasileios Kouvakis, Stylianos E. Trevlakis, Ioannis Arapakis +1
This work presents a new spiking neural network (SNN)-based approach for user equipment-base station (UE-BS) association in non-terrestrial networks (NTNs). With the introduction o…
Optical RIS-enabled Multiple Access Communications
Georgios D. Chondrogiannis, Athanasios P. Chrysologou, Alexandros-Apostolos A. Boulogeorgos +2
In this paper, we identify optical reconfigurable intelligent surfaces (ORISs) as key enablers of next-generation free-space optical (FSO) multiple access systems. By leveraging th…
Modeling blockage in high directional wireless. systems
Evangelos Koutsonas, Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis +2
While the wireless word moves towards higher frequency bands, new challenges arises, due to the inherent characteristics of the transmission links, such as high path and penetratio…
On the Reliability and Security of Ambient Backscatter Uplink NOMA Networks
Athanasios P. Chrysologou, Nestor D. Chatzidiamantis, Alexandros-Apostolos A. Boulogeorgos +1
A fundamental objective of the forthcoming sixth-generation wireless networks is to concurrently serve a vast array of devices many of which, such as Internet-of-Things (IoT) senso…
Training Terahertz Wireless Systems to Battle I/Q Imbalance
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
Due to the non-ideality of analog components, transceivers experience high levels of hardware imperfections, like in-phase and quadrature imbalance (IQI), which manifests itself as…
Can graph neural network-based detection mitigate the impact of hardware imperfections?
Lamprini Mitsiou, Stylianos Trevlakis, Argiris Tsiolas +3
Until recently, researchers used machine learning methods to compensate for hardware imperfections at the symbol level, indicating that optimum radio-frequency transceiver performa…
Channel modeling for in-body optical wireless communications
Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis +1
Next generation in-to-out-of body biomedical applications have adopted optical wireless communications (OWCs). However, by delving into the published literature, a gap is recognise…
Cascaded Composite Turbulence and Misalignment: Statistical Characterization and Applications to Reconfigurable Intelligent Surface-Empowered Wireless Systems
Alexandros-Apostolos A. Boulogeorgos, Nestor Chatzidiamantis, Harilaos G. Sandalidis +2
Reconfigurable intelligent surfaces (RISs) empowered high-frequency (HF) wireless systems are expected to become the supporting pillar for several reliability and data rate hungry…
Pathloss modeling of reconfigurable intelligent surface assisted THz wireless systems
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
This paper presents an analytical pathloss model for reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems. Specifically, the model accommodates both t…
Performance Evaluation of Reconfigurable Intelligent Surface Assisted D-band Wireless Communication
Evangelos N. Papasotiriou, Alexandros-Apostolos A. Boulogeorgos, Antigone Stratakou +1
In the recent years, the proliferation of wireless data traffic has led the scientific community to explore the use of higher unallocated frequency bands, such as the millimeter wa…
Ergodic capacity analysis of reconfigurable intelligent surface assisted wireless systems
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
This paper presents the analytic framework for evaluating the ergodic capacity (EC) of the reconfigurable intelligent surface (RIS) assisted systems. Moreover, high-signal-to-noise…
Outage Probability Analysis of THz Relaying Systems
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
This paper focuses on quantifying the outage performance of terahertz (THz) relaying systems. In this direction, novel closed-form expressions for the outage probability of a dual-…
All-Optical Cochlear Implants
Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis +1
In the present work, we introduce a novel cochlear implant (CI) architecture, namely all-optical CI (AOCI), which directly converts acoustic to optical signals capable of stimulati…
Metasurface-Coated Devices: A New Paradigm for Energy-Efficient and Secure 6G Communications
Theodoros A. Tsiftsis, Constantinos Valagiannopoulos, Hongwu Liu +2
The sixth-generation (6G) era comes with the challenge of offering highly energy-efficient and autonomous communications securely. In this direction, we report energy efficiency (E…
A Low-Overhead Hierarchical Beam-tracking Algorithm for THz Wireless Systems
Giorgos Stratidakis, Georgia D. Ntouni, Alexandros-Apostolos A. Boulogeorgos +2
In this paper, a novel hierarchical beamtracking approach, which is suitable for terahertz (THz) wireless systems, is presented. The main idea is to employ a prediction based algor…
Optical wireless communications for in-body and transdermal biomedical applications
Alexandros-Apostolos A. Boulogeorgos, Stylianos E. Trevlakis, Nestor D. Chatzidiamantis
This article discusses the fundamental architectures for optical wireless systems for biomedical applications. After summarizing the main applications and reporting their requireme…
Relay-Based Blockage and Antenna Misalignment Mitigation in THz Wireless Communications
Giorgos Stratidakis, Evangelos N. Papasotiriou, Haralampos Konstantinis +2
The proliferation of wireless devices in recent years has caused a spectrum shortage, which led the scientific community to explore the potential of using terahertz (THz) communica…
Error analysis of mixed THz0RF wireless systems
Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
In this letter, we introduce a novel mixed terahertz (THz)-radio frequency (RF) wireless system architecture, which can be used for backhaul/fronthaul applications, and we deliver…
A cooperative localization-aided tracking algorithm for THz wireless systems
Giorgos Stratidakis, Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou
In this paper, a novel cooperation-aided localization and tracking approach, suitable for terahertz (THz) wireless systems is presented. It combines an angle of arrival (AoA) track…
Optical Wireless Cochlear Implants
Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Paschalis C. Sofotasios +2
In the present contribution, we introduce a wireless optical communication-based system architecture which is shown to significantly improve the reliability and the spectral and po…