A5054811310- Metamaterials and Metasurfaces Applications
- Advanced Wireless Communication Technologies
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Opportunistic and Delay-Tolerant Networks
- Millimeter-Wave Propagation and Modeling
- Molecular Communication and Nanonetworks
- UAV Applications and Optimization
- Network Traffic and Congestion Control
- Software-Defined Networks and 5G
- Modular Robots and Swarm Intelligence
- Distributed systems and fault tolerance
- Interconnection Networks and Systems
- Cooperative Communication and Network Coding
- Caching and Content Delivery
- Peer-to-Peer Network Technologies
- Satellite Communication Systems
- Wireless Communication Networks Research
- Plasmonic and Surface Plasmon Research
- Advanced Wireless Network Optimization
- Optical Wireless Communication Technologies
- Energy Efficient Wireless Sensor Networks
- Algorithms and Data Compression
- Advanced Data Storage Technologies
University of Ioannina
2020-2025
Foundation for Research and Technology Hellas
2016-2025
Huawei Technologies (Germany)
2022
FORTH Institute of Electronic Structure and Laser
2021
FORTH Institute of Computer Science
2015-2019
Czech Academy of Sciences, Institute of Computer Science
2015-2019
Aristotle University of Thessaloniki
2009-2018
Centre for Research and Technology Hellas
2018
University of Crete
2017
Hella (Germany)
2016
Electromagnetic waves undergo multiple uncontrollable alterations as they propagate within a wireless environment. Free space path loss, signal absorption, well reflections, refractions, and diffractions caused by physical objects the environment highly affect performance of communications. Currently, such effects are intractable to account for treated probabilistic factors. This article proposes radically different approach, enabling deterministic, programmable control over behavior...
Abstract Metasurfaces, the ultrathin, 2D version of metamaterials, have recently attracted a surge attention for their capability to manipulate electromagnetic waves. Recent advances in reconfigurable and programmable metasurfaces greatly extended scope reach into practical applications. Such functional sheet materials can enormous impact on imaging, communication, sensing applications, serving as artificial skins that shape fields. Motivated by these opportunities, this progress report...
Programmable wireless environments use unique customizable software processes rather than traditional rigid channel models.
Wireless communication environments are unaware of the ongoing data exchange efforts within them. Moreover, their effect on quality is intractable in all but simplest cases. The present work proposes a new paradigm, where indoor scattering becomes software-defined and, subsequently, optimizable across wide frequency ranges. controlled can surpass natural behavior, exemplary overriding Snell's law, reflecting waves towards any custom angle (including negative ones). Thus, path loss and...
In this paper we present the theoretical considerations and design evolution of a proof-of-concept reconfigurable metasurface, primarily used as tunable microwave absorber, but also wavefront manipulation polarization conversion device in reflection. We outline all taken into account, from selection patch shape, unit cell size, substrate, to topology structure that realizes desired tunability. The presented conforms fabrication restrictions is co-designed work with an integrated circuit chip...
Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over waves, from microwave to visible range. With tunability added the programmable metasurfaces enable us benefit multiple unique functionalities controlled by external stimuli. In this review paper, we will discuss recent progress in field of elaborate on different approaches realize them, global aspects, local software-defined...
Data collection in massive Internet of Things networks requires novel and flexible methods. Unmanned aerial vehicles (UAVs) are foreseen as a means to collect data rapidly even remote areas without static telecommunication infrastructure. In this direction, UAV-mounted reconfigurable intelligent surfaces (RISs) aid reducing the hardware requirements signal processing complexity at UAV side, while increasing network’s energy efficiency coverage. Hence, paper, we propose utilization RIS for...
Reconfigurable Intelligent Surfaces (RIS) are well established as a promising solution to the blockage problem in millimeter-wave (mm-wave) and terahertz (THz) communications, envisioned serve demanding networking applications, such 6G vehicular. HyperSurfaces (HSF) is revolutionary enabling technology for RIS, complementing Software Defined Metasurfaces (SDM) with an embedded network of controllers enhance intelligence autonomous operation wireless networks. In this work, we consider...
This paper introduces a class of programmable metamaterials, whose electromagnetic properties can be controlled via software. These software defined metamaterials (SDMs) stem from utilizing in combination with nanonetworks. Metamaterials are artificial structures that may not found nature. Since their initial advent, they have inspired ground-breaking applications to range research topics, such as invisibility objects (cloaking), radiation absorption, filtering light and sound well efficient...
Metamaterials are artificial structures which have recently enabled the realization of novel electromagnetic components with engineered and even unnatural functionalities. Existing metamaterials specifically designed for a single application working under preset conditions (e.g. cloaking fixed angle incidence) cannot be reused. Software-Defined (SDMs) much sought-after paradigm shift, exhibiting properties that can reconfigured at runtime using set software primitives. To enable this new...
Software-defined metasurfaces (SDMs) comprise a dense topology of basic elements called meta-atoms, exerting the highest degree control over surface currents among intelligent panel technologies. As such, they can transform impinging electromagnetic (EM) waves in complex ways, modifying their direction, power, frequency spectrum, polarity and phase. A well-defined software interface allows for applying such functionalities to inter-networking SDMs, while abstracting underlying physics....
Over the last few years, analysis and modeling of networks as well networked dynamical systems, has attracted considerable interdisciplinary interest, especially using complex systems theory. These efforts are driven by fact that diverse genetic or Internet can be effectively described networks. Contrary, despite unprecedented evolution technology, basic issues fundamental principles related to structural evolutionary properties communication still remain largely unaddressed. The situation...
Programmable wireless environments enable the software-defined propagation of waves within them, yielding exceptional performance potential. Several building-block technologies have been implemented and evaluated at physical layer. The present work contributes a network-layer scheme to configure such for multiple users objectives, any physical-layer technology. Supported objectives include combination Quality Service power transfer optimization, eavesdropping Doppler effect mitigation, in...
Distributed link-flooding attacks constitute a new class of with the potential to segment large areas Internet. Their distributed nature makes detection and mitigation very hard. This work proposes novel framework for analytical modeling optimal such attacks. The is modeled as problem relational algebra, representing association attackers (bots) targets. analysis seeks optimally dissolve all but malevolent associations. implemented at level online Traffic Engineering (TE), which naturally...
Software-defined metasurfaces are electromagnetically ultra-thin, artificial components that can provide engineered and externally controllable functionalities. The control over these functionalities is enabled by the metasurface tunability, which implemented embedded electronic circuits modify locally surface resistance reactance. Integrating controllers within able them to intercommunicate adaptively reconfigure, thus imparting a desired electromagnetic operation, opens path towards...
Programmable metasurfaces have garnered significant attention as they confer unprecedented control over the electromagnetic (EM) response of any surface. Such feature has given rise to novel design paradigms such Software-Defined Metamaterials (SDM) and Reconfigurable Intelligent Surfaces (RIS) with multiple groundbreaking applications. However, development programmable tailored particularities a potentially large application pool becomes daunting task because space remarkably large. This...
Reconfigurable intelligent surfaces (RIS) have been presented as a solution to realize the concept of smart radio environments, wherein uninterrupted coverage and extremely high quality service can be ensured. In this letter, assuming that multiple RIS are deployed in propagation environment, performance cascaded network affected by imperfect phase estimation is evaluated. Specifically, we derive closed-form expressions for outage probability, ergodic capacity average symbol error...
Programmable wireless environments (PWEs) utilize internetworked intelligent metasurfaces to transform propagation into a software-controlled resource. In this article, the interplay is explored between user devices, metasurfaces, and PWE control system from theory end-to-end implementation. This article first discusses metasurface hardware software, covering complete workflow device initialization its final service via PWE. Furthermore, be compatible with 5G 6G systems, software-defined...
The present paper introduces a joint coordinate and routing system (CORONA) which can be deployed dynamically on 2D ad-hoc nanonetwork. User-selected nodes are used as anchor-points at the setup phase. All then measure their distances, in number of hops, from these anchors, obtaining sense geolocation. At operation phase, employs appropriate subset selected by sender packet. CORONA requires minimal overhead simple integer-based calculations only, imposing limited requirements for trustworthy...
Metasurfaces (MSs) have been utilized to manipulate different properties of electromagnetic waves. By combining local control over the wave amplitude, phase, and polarization into a single tunable structure, multi-functional reconfigurable metasurface can be realized, capable full incident radiation. Here, we experimentally validate architecture for microwave regime, where in principle variable loads are connected behind backplane reconfigurably shape complex surface impedance. As...
In the evolving landscape of sixth-generation (6G) wireless networks, unmanned aerial vehicles (UAVs) have emerged as transformative tools for dynamic and adaptive connectivity. However, dynamically adjusting their position to offer favorable communication channels introduces operational challenges in terms energy consumption, especially when integrating advanced technologies like reconfigurable intelligent surfaces (RISs) full-duplex relays (FDRs). To this end, by recognizing pivotal role...
Link-flooding attacks have the potential to disconnect even entire countries from Internet. Moreover, newly proposed indirect link-flooding attacks, such as ``Crossfire'', are extremely hard expose and, subsequently, mitigate effectively. Traffic Engineering (TE) is network's natural way of mitigating link overload events, balancing load and restoring connectivity. This work poses question: Do we need a new kind TE an attack well? The key idea that carefully crafted, attack-aware could force...
Tunable metasurfaces are ultra-thin, artificial electromagnetic components that provide engineered and externally adjustable functionalities. The programmable metasurface, the HyperSurFace, concept consists in integrating controllers within metasurface interact locally communicate globally to obtain a given behaviour. Here, we address design constraints introduced by both functions accommodated i.e., desired operation unit cells wireless communication enabling such functionality. process for...