A5022533728- Advanced MIMO Systems Optimization
- Energy Efficient Wireless Sensor Networks
- IoT and Edge/Fog Computing
- Advanced Wireless Communication Technologies
- Wireless Networks and Protocols
- Cooperative Communication and Network Coding
- Mobile Ad Hoc Networks
- Millimeter-Wave Propagation and Modeling
- IPv6, Mobility, Handover, Networks, Security
- Power Line Communications and Noise
- Network Traffic and Congestion Control
- Software-Defined Networks and 5G
- Smart Grid Security and Resilience
- Vehicular Ad Hoc Networks (VANETs)
- Opportunistic and Delay-Tolerant Networks
- Advanced Wireless Network Optimization
- Microwave Engineering and Waveguides
- Bluetooth and Wireless Communication Technologies
- Peer-to-Peer Network Technologies
- Wireless Communication Networks Research
- Image and Video Quality Assessment
- Smart Grid Energy Management
- Security in Wireless Sensor Networks
- Network Time Synchronization Technologies
- IoT Networks and Protocols
National and Kapodistrian University of Athens
2019-2024
Technological Educational Institute of Central Greece
2010-2018
Technological Educational Institute of Thessaly
2014-2015
National Centre of Scientific Research "Demokritos"
2005-2012
Institute of Informatics & Telecommunications
2005-2009
National Technical University of Athens
2002-2007
The digitization of manufacturing industry has led to leaner and more efficient production, under the Industry 4.0 concept. Nowadays, datasets collected from shop floor assets information technology (IT) systems are used in data-driven analytics efforts support informed business intelligence decisions. However, these results currently only isolated dispersed parts production process. At same time, full integration artificial (AI) all is lacking. In this context, goal manuscript present a...
Driven by the emerging trend for transparent, open and programmable communications, Open Radio Access Network (O-RAN) constitutes dominant architectural approach deploying future wireless networks. Towards standardizing specifying building blocks principles of O-RAN, a coordinated global effort has been observed, mainly comprised O-RAN Alliance, operators several research activities. This paper presents aspects current status deployments, integrating both existing ongoing activities from...
The full deployment of sixth-generation (6G) networks is inextricably connected with a holistic network redesign able to deal various emerging challenges, such as integration heterogeneous technologies and devices, well support latency bandwidth demanding applications. In complex environment, resource optimization, security privacy enhancement can be quite demanding, due the vast diverse data generation endpoints associated hardware elements. Therefore, efficient collection mechanisms are...
The diversity of applications that current and emerging Wireless Sensor Networks (WSNs) are called to support imposes different requirements on the underlying network with respect delay loss, while at same time WSN its own intricacies. satisfaction these highly depends metric upon which forwarding routes decided. In this view, IETF ROLL group has proposed RPL routing protocol, can flexibly work various metrics, as long they hold specific properties. system implementer/user is free decide...
The provision of high data rate services to mobile users combined with improved quality experience (i.e., zero latency multimedia content) drives technological evolution towards the design and implementation fifth generation (5G) broadband wireless networks. To this end, a dynamic network approach is adopted whereby topology configured according service demands. In parallel, many private companies are interested in developing their own 5G networks, also referred as non-public networks...
The energy sector represents undoubtedly one of the most significant "test cases" for 5G enabling technologies, due to need addressing a huge range very diverse requirements deal with across variety applications (stringent capacity smart metering/AMI versus latency supervisory control and fault localization).However, effectively support utilities along their transition towards more decentralized renewable-oriented systems, several open issues still remain as networks management automation,...
As the discussions on sixth generation (6G) wireless networks progress at a rapid pace, various approaches have emerged over last years regarding new architectural concepts that can support 6G vision. Therefore, goal of this work is to highlight most important technological efforts in relation definition concept. To end, primary challenges are firstly described, which be viewed as driving forces for standardization. Afterwards, novel discussed concept, such introduction artificial...
The majority of research and development efforts in the area Wireless Sensor Networks (WSNs) focus on WSN systems that are dedicated for a specific application. However, this trend is currently being replaced by resource-rich deployments expected to provide capabilities excess any application's requirements. In regard, concept virtual sensor networking an emerging approach enables decoupling physical deployment from applications running top it, allowing way dynamic collaboration subset nodes...
The goal of this paper is to evaluate the performance an adaptive beamforming approach in fifth-generation millimeter-wave multicellular networks, where massive multiple-input multiple-output configurations are employed all active base stations considered orientations. In context, performed with help a predefined set that can deal various traffic scenarios by properly generating highly directional beams on demand. parallel, machine learning (ML) based k-nearest neighbors (<i>k</i>-NN)...
With vehicle-to-vehicle and vehicle-to-infrastructure communications gaining momentum, immense opportunities for developing a new application gamut open up. These range from applications targeting security/safety efficient transportation to in-car entertainment enjoying multi-player mixed-reality games. The potential of VANETs has been recognized by standardization bodies other stakeholders, including car manufacturers, that have established multiple consortia initiatives explore the...
Power allocation is strongly related to the coverage and capacity of wireless networks, playing a critical role in development 5G networks. This paper proposes Demand-Driven Allocation (DDPA) algorithm aiming fulfill requested throughput individual users accommodate their needs. DDPA based on model-free Deep Reinforcement Learning (DRL) approaches has ability proactively adjust power levels network transmitters. The performance developed evaluated for variety simulation parameters variable...
The goal of this paper is the performance evaluation a deep learning approach when deployed in fifth-generation (5G) millimeter wave (mmWave) multicellular networks. To end, optimum beamforming configuration defined by two neural networks (NNs) that are properly trained, according to mean square error (MSE) minimization. first network has as input requested spectral efficiency (SE) per active sector, while second corresponding energy (EE). Hence, channel and power variations can now be taken...
The key enabling function for seamless mobility and service continuity among a variety of wireless access technologies is the handover. Handovers within same radio system are addressed by standardization bodies involved in development corresponding (e.g., 3GPP, 3GPP2, IEEE, DVB), while handovers between heterogeneous systems managed protocols developed IETF. However, interoperability that required to realize vision Beyond 3G calls coordinated actions integrated solutions combining individual...
SUMMARY The paper focuses on the concept of vertical handover (VHO) among collaborative wireless networks, which is necessary driver for seamless mobility and thus ability user to be always best connected. discusses required enabling architecture distributed VHO decision making that based principles IEEE 1900.4 standard key media‐independent signaling procedure related 802.21 standard. proposed framework combines ‘lower‐layer’ ‘higher layer’ intelligence in a unified way, drive decisions...
This paper presents the architecture of VITRO system concept developed under project for realization Virtual Sensor Networks. The aim proposed is to enable scalable, flexible, adaptive, energy-efficient and trust-aware Network platforms, focusing on reduction deployment complexity advanced interoperability mechanisms. efforts have been put towards specifying a Service Provisioning mechanisms sensor middleware design.
Wireless Sensor Networks (WSNs) often need to operate under strict requirements on energy consumption and be capable of self-adapting the presence non-trusted nodes which do not fully cooperate in packet forwarding operation. In such an environment, mechanism employed for calculation routing paths minimum cost terms number transmissions executed reliable communication between data source sink is essential prevent unnecessary nodes' depletion help prolong network's lifetime. this paper, we...
Smart grid is not a system, application, network, or single device. It no surprise that there unique definition of the Grid (SG): ABB says an evolved system manages electricity demand in sustainable, reliable and economic manner, built on advanced infrastructure tuned to facilitate integration all involved elements. However, definitions from authoritative organizations follow common theme: grids utilize information communication technologies manage energy distribution optimize transmission...
Hardware complexity reduction is a key concept towards the design and implementation of next generation broadband wireless networks. To this end, goal study presented in paper to evaluate performance an adaptive hybrid analog-digital beamforming approach fifth-generation (5G) massive multiple input output (MIMO) millimeter wave (mmWave) cellular orientations. In context, generated beams are formed dynamically according traffic demands, via on-off analog activation radiating elements per...
The goal of the study presented in this paper is to evaluate performance a proposed adaptive beamforming approach cell-free massive multiple input output (CF-mMIMO) orientations. To end, mobile stations (MSs) can be served by access points (APs) simultaneously. In same context, dynamic physical resource block (PRB) allocation evaluated as well, where set assigned PRBs per active MS constantly updated according their signal strength and amount interference that cause rest co-channel MSs....
The complexity of the power grid, in conjunction with ever increasing demand for electricity, creates need efficient analysis and control system. evolution legacy system towards new smart grid intensifies this due to large number sensors actuators that must be monitored controlled, types distributed energy sources integrated loads supported. At same time, integration human-activity awareness into is emerging will allow monitor, share manage information actions on business, as well real...
The availability of multiple collocated wireless networks and the multi-radio capabilities contemporary terminals open potential for optimized connectivity over heterogeneous environment. Vertical Handover (VHO) operations play a central role in such setting, enabling dynamic association users with most appropriate among those available, towards improved effectiveness according to host relevant criteria. At same time, efficiency executing VHO themselves is also factor affecting overall...
The goal of the study presented in this paper is to evaluate performance a proposed transmission scheme multiuser multiple-input multiple-output (MIMO) configurations, via code reuse. Hence, non-orthogonal multiple access (NOMA) performed. To end, correlation matrix received data constructed at transmitter, with feedback as only primary eigenvector equivalent channel matrix, which derived after principal component analysis (PCA) receiver. Afterwards, users experiencing improved quality...