Search Results for author: Angeliki Alexiou

Found 14 papers, 0 papers with code

Perceptive, Resilient, and Efficient Networks assisted by Reconfigurable Intelligent Surfaces

no code implementations2 Dec 2023 Giorgos Stratidakis, Sotiris Droulias, Angeliki Alexiou

Wireless communications are nowadays shifting to higher operation frequencies with the aim to meet the ever-increasing demand for bandwidth.

Training Terahertz Wireless Systems to Battle I/Q Imbalance

no code implementations2 Jun 2023 Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou

Two training approaches are implemented, namely: i) conventional that requires a considerable amount of data for training, and ii) a reinforcement learning based one, which demands a shorter dataset in comparison to the former.

Analytical characterization of RIS-aided terahertz links in the presence of beam misalignment

no code implementations12 Dec 2022 Evangelos N. Papasotiriou, Sotiris Droulias, Angeliki Alexiou

The terahertz (THz) frequency band has recently attracted considerable attention in wireless communications as potential candidate for providing the necessary high bandwidth for demanding applications.

Throughput analysis of RIS-assisted UAV wireless systems under disorientation and misalignment

no code implementations10 Dec 2022 Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou, Marco Di Renzo

Reconfigurable intelligent surface (RIS)-assisted unmanned areal vehicles (UAV) communications have been identified as a key enabler of a number of next-generation applications.

Artificial Intelligence Empowered Multiple Access for Ultra Reliable and Low Latency THz Wireless Networks

no code implementations17 Aug 2022 Alexandros-Apostolos A. Boulogeorgos, Edwin Yaqub, Rachana Desai, Tachporn Sanguanpuak, Nikos Katzouris, Fotis Lazarakis, Angeliki Alexiou, Marco Di Renzo

In more detail, a fast and centralized joint user association, radio resource allocation, and blockage avoidance by means of a novel metaheuristic-machine learning framework is documented, that maximizes the THz networks performance, while minimizing the association latency by approximately three orders of magnitude.

Management

Performance Analysis of Multi-Reconfigurable Intelligent Surface-Empowered THz Wireless Systems

no code implementations13 Feb 2022 Alexandros-Apostolos A. Boulogeorgos, Nestor Chatzidiamantis, Harilaos G. Sandalidis, Angeliki Alexiou, Marco Di Renzo

In this paper, we introduce a theoretical framework for analyzing the performance of multi-reconfigurable intelligence surface (RIS) empowered terahertz (THz) wireless systems subject to turbulence and stochastic beam misalignment.

Outage performance analysis of RIS-assisted UAV wireless systems under disorientation and misalignment

no code implementations28 Jan 2022 Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou, Marco Di Renzo

In this paper, we analyze the performance of a reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicle (UAV) wireless system that is affected by mixture-gamma small-scale fading, stochastic disorientation, and misalignment, as well as transceivers hardware imperfections.

Cascaded Composite Turbulence and Misalignment: Statistical Characterization and Applications to Reconfigurable Intelligent Surface-Empowered Wireless Systems

no code implementations29 Jun 2021 Alexandros-Apostolos A. Boulogeorgos, Nestor Chatzidiamantis, Harilaos G. Sandalidis, Angeliki Alexiou, Marco Di Renzo

Building upon the derived analytical expressions, we present novel closed-form formulas that quantify the joint impact of turbulence and misalignment on the outage performance for two scenarios of high interest namely cascaded multi-RIS-empowered free space optics (FSO) and terahertz (THz) wireless systems.

Pathloss modeling of reconfigurable intelligent surface assisted THz wireless systems

no code implementations17 Feb 2021 Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou

This paper presents an analytical pathloss model for reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems.

Reconfigurable Intelligent Surface Optimal Placement in Millimeter-Wave Networks

no code implementations19 Nov 2020 Konstantinos Ntontin, Alexandros A. Boulogeorgos, Dimitrios Selimis, Fotis Lazarakis, Angeliki Alexiou, Symeon Chatzinotas

Subsequently, based on the model we derive the end-to-end expression of the received signal power and, furthermore, provide approximate closed-form expressions in the case that the RIS size is either much smaller or at least equal to the transmission beam footprint.

Information Theory Signal Processing Information Theory

Performance Evaluation of Reconfigurable Intelligent Surface Assisted D-band Wireless Communication

no code implementations14 Aug 2020 Evangelos N. Papasotiriou, Alexandros-Apostolos A. Boulogeorgos, Antigone Stratakou, Angeliki Alexiou

The system performance is evaluated in terms of pathgain and capacity considering the RIS design parameters, the TX/RX-RIS distance and the elevation angles from the center of the RIS to the transceivers.

Ergodic capacity analysis of reconfigurable intelligent surface assisted wireless systems

no code implementations5 Aug 2020 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.

Outage Probability Analysis of THz Relaying Systems

no code implementations14 Jul 2020 Alexandros-Apostolos A. Boulogeorgos, Angeliki Alexiou

This paper focuses on quantifying the outage performance of terahertz (THz) relaying systems.

A Low-Overhead Hierarchical Beam-tracking Algorithm for THz Wireless Systems

no code implementations4 May 2020 Giorgos Stratidakis, Georgia D. Ntouni, Alexandros-Apostolos A. Boulogeorgos, Dimitrios Kritharidis, Angeliki Alexiou

In this paper, a novel hierarchical beamtracking approach, which is suitable for terahertz (THz) wireless systems, is presented.

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