Papers by Alexandros Apostolos Boulogeorgos
Zenodo (CERN European Organization for Nuclear Research), May 1, 2023
High-end components that conduct complicated tasks automatically are a part of modern industrial ... more High-end components that conduct complicated tasks automatically are a part of modern industrial systems. However, in order for these parts to function at the desired level, they need to be maintained by qualified experts. Solutions based on Augmented Reality (AR) have been established with the goal of raising production rates and quality while lowering maintenance costs. With the introduction of two unique interaction interfaces based on wearable targets and human face orientation, we are proposing hands-free advanced interactive solutions in this study with the goal of reducing the bias towards certain users. Using traditional devices in real time, a comparison investigation using alternative interaction interfaces is conducted. The suggested solutions are supported by various AI powered methods such as novel gravity-map based motion adjustment that is made possible by predictive deep models that reduce the bias of traditional hand-or finger-based interaction interfaces.
arXiv (Cornell University), Jun 29, 2023
High-end components that conduct complicated tasks automatically are a part of modern industrial ... more High-end components that conduct complicated tasks automatically are a part of modern industrial systems. However, in order for these parts to function at the desired level, they need to be maintained by qualified experts. Solutions based on Augmented Reality (AR) have been established with the goal of raising production rates and quality while lowering maintenance costs. With the introduction of two unique interaction interfaces based on wearable targets and human face orientation, we are proposing hands-free advanced interactive solutions in this study with the goal of reducing the bias towards certain users. Using traditional devices in real time, a comparison investigation using alternative interaction interfaces is conducted. The suggested solutions are supported by various AI powered methods such as novel gravity-map based motion adjustment that is made possible by predictive deep models that reduce the bias of traditional hand-or finger-based interaction interfaces.
2023 IEEE/ACM 23rd International Symposium on Cluster, Cloud and Internet Computing Workshops (CCGridW)
GLOBECOM 2022 - 2022 IEEE Global Communications Conference
The transformation of the conventional electrical grid into a digital ecosystem brings significan... more The transformation of the conventional electrical grid into a digital ecosystem brings significant benefits, such as two-way communication between energy consumers and utilities, self-monitoring and pervasive controls. However, the advent of the smart electrical grid raises severe cybersecurity and privacy concerns, given the presence of legacy systems and communications protocols. This paper focuses on False Data Injection (FDI) cyberattacks against a low-voltage distribution system, taking full advantage of Man In The Middle (MITM) actions. The first cyberattack targets the communication between a smart meter and an Active Distribution Management System (ADMS), while the second FDI cyberattack targets the communication between a smart inverter and ADMS. In both cases, the cyberattacks affect the operation of the distribution transformer, thus resulting in devastating consequences. Moreover, this paper provides an Artificial Intelligence (AI)-based Intrusion Detection System (IDS), detecting and mitigating the above cyberattacks in a timely manner. The evaluation results demonstrate the efficiency of the proposed IDS.
IEEE Transactions on Vehicular Technology
Reconfigurable intelligent surfaces (RISs) empowered high-frequency (HF) wireless systems are exp... more Reconfigurable intelligent surfaces (RISs) empowered high-frequency (HF) wireless systems are expected to become the supporting pillar for several reliability and datarate hungry applications. Such systems are, however, sensitive to misalignment and atmospheric phenomena including turbulence. Most of the existing studies on the performance assessment of RIS-empowered wireless systems ignore the impact of the aforementioned phenomena. Motivated by this, the current contribution presents a theoretical framework for analyzing the performance of multi-RIS empowered HF wireless systems. More specifically, we statistically characterize the cascaded composite turbulence and misalignment channels in terms of probability density and cumulative distribution functions. Building upon the derived analytical expressions, we present novel closedform 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. In addition, we provide an insightful outage probability upper-bound for a third scenario that considers parallel multi-RIS-empowered FSO systems. Our results highlight the importance of accurately modeling both turbulence and misalignment when assessing the performance of such systems.
The next generation wireless networks are envisioned to deal with the expected thousand-fold incr... more The next generation wireless networks are envisioned to deal with the expected thousand-fold increase in total mobile broadband data and the hundred-fold increase in connected devices. In order to provide higher data rates, improved end-to-end performance, low latency, and low energy consumption at a low cost per transmission, the fifth generation (5G) systems are required to overcome various handicaps of current cellular networks and wireless links. One of the key handicaps of 5G systems is the performance degradation of the communication link, due to the use of low-cost transceiver in high data rate. Motivated by this in this paper, we discuss the impact of transceiver front-end hardware imperfections on the spectrum sensing performance of cognitive radios.
This thesis investigates the influence of interference in wireless systems, revisits promising in... more This thesis investigates the influence of interference in wireless systems, revisits promising interference management solutions, as well as studies the impact of interference, caused by hardware imperfections, on the performance of the wireless link and propose countermeasures. The thesis is divided into two parts. In the first part of the thesis, different types of interference and modern interference management solutions, which are expected to be used in the future wireless networks, are reviewed. Moreover, the influence of fading and interference, due to the existence of multiple possible users operating simultaneously in the same carrier frequency, on the spectrum sensing capability of an energy detector (ED) is investigated. Analytical tools for the performance evaluation of this problem are derived, while the problem of appropriately selecting the detection threshold and the sensing duration, in order to satisfy a specific requirement, is discussed. The offered analytical fra...
This deliverable includes the work conducted within Task 1.1 "Use cases definition and syste... more This deliverable includes the work conducted within Task 1.1 "Use cases definition and system requirements specification". The main objective of this task is to define the use cases and a set of requirements that will be the basis for all further work. Each use case contains scenarios in order to organize the technical work efficiently and focus on ARIADNE challenges and innovations. Thus, Deliverable 1.1 presents an overview of the ARIADNE system concept, a detailed description of each use case and corresponding scenarios, the resulting analysis on the definition of the main Key Performance Indicators (KPI) that each use case and the ARIADNE system target to satisfy and, finally, a description of how the machine learning techniques will be applied in the framework of ARIADNE.
In this letter, we introduce a novel mixed terahertz (THz)-radio frequency (RF) wireless system a... more 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 the theoretical framework for its performance assessment. In more detail, after identifying the main design parameters and characteristics, we derive novel closed-form expressions for the end-to-end signal-to-noise ratio cumulative density function, the outage probability, and the symbol error rate, assuming that the system experiences the joint effect of fading and stochastic antenna misalignment. The derived analytical framework is verified through simulations and quantifies the system's effectiveness and reliability. Finally, our results contribute to the extraction of useful design guidelines.
a variety of challenging telecommunication topics ranging from background fields like signals, tr... more a variety of challenging telecommunication topics ranging from background fields like signals, traffic, coding, communication basics up to large communication systems and networks, fixed, mobile and integrated, etc. Applications, services, system and network management issues also received significant attention. The spectrum of 21st Century telecommunications is marked by the arrival of new business models, new platforms, new architectures and new customer profiles. Next generation networks, IP multimedia systems, IPTV, and converging network and services are new telecommunications paradigms. Technology achievements in terms of coexistence of IPv4 and IPv6, multiple access technologies, IP-MPLS network design driven methods, multicast and high speed require innovative approaches to design and develop large scale telecommunications networks. Mobile and wireless communications add profit to large spectrum of technologies and services. We witness the evolution 2G, 2.5G, 3G and beyond, ...
IEEE Communications Magazine, 2021
This article discusses the fundamental architectures for optical wireless systems for biomedical ... more This article discusses the fundamental architectures for optical wireless systems for biomedical applications. After summarizing the main applications and reporting their requirements, we describe the characteristics of the transdermal and inbody optical channels as well as the challenges that they impose in the design of communication systems. In more detail, we provide three possible architectures for transdemal communications, namely electro-optical (EO) monitoring, opto-electrical (OE) and all-optical (AO) for neural stimulation, which are currently under investigation, whereas for in-body communications, we provide a nano-scale AO (NAO) concept. For each architecture, we discuss the main operation principles, the technology enablers and research directions for their development. Finally, we highlight the necessity of designing an information theoretic framework for the analysis and design of the physical (PHY) and medium access control (MAC) layers, which takes into account the channels' characteristics.
IEEE Access, 2020
Over the recent years, an increasing amount of research effort has been directed toward the devel... more Over the recent years, an increasing amount of research effort has been directed toward the development and optimization of optical cell stimulation (OCS) techniques, while electrical cell stimulation (ECS) has been perfected. This article investigates the existing ECS and OCS methods from a communication perspective and, after summarizing the main breakthroughs in both fields, introduces a novel system model that treats the stimulation as a communication process. Additionally, we discuss the main particularities of ECS and OCS models and conduct a comparative analysis that quantifies the performance of the aforementioned methods based on suitable engineering metrics such as average latency, power consumption, transmission distance, as well as stimulation frequency, pulse width, and amplitude. Finally, future research directions emerge from the provided insightful discussion.
2018 7th International Conference on Modern Circuits and Systems Technologies (MOCAST), 2018
In this paper, we study the performance of the transdermal optical wireless communications (OWCs)... more In this paper, we study the performance of the transdermal optical wireless communications (OWCs). In order to provide a quantified understanding of the link's parameters, we establish an appropriate theoretical framework that takes into account the channel particularities, the integration area of the internal unit, the transmitter-receiver misalignment, and the characteristics of the optical units. In more detail, we present closed-form expressions for the instantaneous and average signal to noise ratio (SNR) of the OWCs transdermal link. The findings reveal that misalignment fading drastically affects the reliability and effectiveness of the transdermal link.
IEEE Transactions on Molecular, Biological and Multi-Scale Communications, 2020
In the present work, we introduce a novel cochlear implant (CI) architecture, namely all-optical ... more 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 stimulating the cochlear neurons. First, we describe the building-blocks (BBs) of the AOCI, and explain their functionalities as well as their interconnections. Next, we present a comprehensive system model that incorporates the technical characteristics and constraints of each BB, the transdermal-optical-channel particularities, i.e., optical path-loss and external-implanted device stochastic pointing-errors, and the cochlear neurons biological properties. Additionally, in order to prove the feasibility of the AOCI architecture, we conduct a link-budget analysis that outputs novel closed-form expressions for the instantaneous and average photon flux that is emitted on the cochlear neurons. Likewise, we define three new key-performance-indicators (KPIs), namely probability of hearing, probability of false-hearing, ...
The present white paper focuses on the system requirements of TERRANOVA. Initially details the ke... more The present white paper focuses on the system requirements of TERRANOVA. Initially details the key use cases for the TERRANOVA technology and presents the description of the network architecture. In more detail, the use cases are classified into two categories, namely backhaul & fronthaul and access and small cell backhaul. The first category refers to fibre extender, point-to-point and redundancy applications, whereas the latter is designed to support backup connection for small and medium-sized enterprises (SMEs), internet of things (IoT) dense environments, data centres, indoor wireless access, ad hoc networks, and last mile access. Then, it provides the networks architecture for the TERRANOVA system as well as the network elements that need to be deployed. The use cases are matched to specific technical scenarios, namely outdoor fixed point-to-point (P2P), outdoor/indoor individual point-to-multipoint (P2MP), and outdoor/indoor "quasi"-omnidirection, and the key perfor...
Polar codes have been proven to be capacity achieving for any binary-input discrete memoryless ch... more 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 over the single-input single-output wireless channel. However, the use of polar codes to secure multiple-antenna transmission and reception has not yet been reported in the open literature. In this paper, we assume a multiple-input multiple-output wiretap channel, where the legitimate receiver and the eavesdropper are equipped with the same number of antennas. We introduce a protocol that exploits the properties of both physical and media access control layer security by employing polar coding and encryption techniques in a hybrid manner in order to guarantee secure transmission. A novel security technique is also proposed, where a cryptographic key is generated based on the information transmitted and renewed every transmission block without the need for a separate key exchange method. Finally, to illustrat...
Internet of things (IoT) changes significantly the requirements for connectivity, mainly with reg... more Internet of things (IoT) changes significantly the requirements for connectivity, mainly with regards to long battery life, low device cost, low deployment cost, extended coverage and support for a massive number of devices. Driven from these requirements, several different cellular and non-cellular low power wide area network (LPWAN) solutions are emerging and competing for IoT business and the overall connectivity market. Motivated by this, in this paper, we review and compare the design specifications of different LPWAN solutions, as well as, we discuss their suitability for different IoT applications. Finally, we present the challenges, future trends, and potential research directions for LPWANs.
This paper presents an analytical pathloss model for reconfigurable intelligent surface (RIS) ass... more This paper presents an analytical pathloss model for reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems. Specifically, the model accommodates both the THz link and the RIS particularities. Finally, we derive a closed-form expression that returns the optimal phase shifting of each RIS reflection unit. The derived pathloss model is validated through extensive electromagnetic simulations and is expected to play a key role in the design of RIS-assisted THz wireless systems.
Uploads
Papers by Alexandros Apostolos Boulogeorgos