A5078213890- Advanced Wireless Communication Technologies
- UAV Applications and Optimization
- Satellite Communication Systems
- Energy Harvesting in Wireless Networks
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Optical Wireless Communication Technologies
- Energy Efficient Wireless Sensor Networks
- Historical Astronomy and Related Studies
- Metamaterials and Metasurfaces Applications
- Mobile Agent-Based Network Management
- Opportunistic and Delay-Tolerant Networks
- History and Developments in Astronomy
- Indoor and Outdoor Localization Technologies
- Distributed Control Multi-Agent Systems
- Advanced Optical Sensing Technologies
- PAPR reduction in OFDM
- Modular Robots and Swarm Intelligence
- Underwater Vehicles and Communication Systems
- IoT Networks and Protocols
- Full-Duplex Wireless Communications
- Advanced Mathematical Theories
- Radar Systems and Signal Processing
- Advanced Wireless Communication Techniques
- Advanced MIMO Systems Optimization
Aristotle University of Thessaloniki
2021-2025
Technical University of Crete
2023-2024
Meta-surfaces intend to improve the performance of future wireless networks significantly by controlling propagation and shaping radio waves according generalized Snell's law. A recent application meta-surfaces are reconfigurable intelligent surfaces that mainly proposed for reflection steering impinging signal. In this article, we introduce randomly (RRSs) aiming diffuse incoming wave characterize an RRS-assisted communication network. To facilitate analysis network, first, present novel...
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) 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...
The requirement of the upcoming sixth-generation (6G) wireless communication systems to significantly elevate services enhanced mobile broadband (eMBB) and massive machine-type communications (mMTC) necessitates design investigation appropriate multiple access schemes. This paper investigates impact random source deployment on performance uplink systems, emphasizing implications non-orthogonality in contention-free contention-based For latter scheme, we combine strengths slotted ALOHA...
Dynamic spectrum allocation for diverse future applications is anticipated to be supported by sixth-generation (6G) wireless networks. Specifically, automatic modulation classification (AMC) has been highlighted as a technique enhance spectral utilization. However, its accuracy influenced not only additive white Gaussian noise and channel fading but also phase imperfections (PI) coming from unsynchronized local oscillators imperfect state information (CSI), leading degraded performance. To...
To compensate for severe blockages and achieve flexible pervasive network access, UAV-mounted RISs have recently attracted research interest. In this work, a solar-powered RIS (SUR) system is investigated, where solar cells are utilized to provide supplementary propulsion power. maximize the energy efficiency of SUR system, optimal joint active passive beamforming, as well energy-constrained UAV trajectory, i.e., its velocity placement, derived in closed form. Furthermore, subject size,...
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...
A key service of the sixth generation (6G) wireless networks is envisioned to be native Artificial Intelligence, which calls for radical changes way nodes communicate and perform computations, as well role environment. For this purpose, over-the-air computing (AirComp) a promising technique ultra low-latency data aggregation, enabled by waveform superposition properties multiple access channel. In letter, synergy decentralized AirComp, reconfigurable intelligent surfaces (RISs) machine...
A primary objective of the forthcoming sixth generation (6G) wireless networking is to support demanding applications, while ensuring energy efficiency. Programmable environments (PWEs) have emerged as a promising solution, leveraging reconfigurable intelligent surfaces (RISs), control propagation and deliver exceptional quality-of-service. In this paper, we analyze performance network supported by <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Future connected vehicles will require high-performance communication technologies for advanced cooperative driving applications such as maneuvering and perception. mmWave communications can meet the bandwidth requirements of applications, but typically harsh propagation conditions vehicular environments hinder broad adoption devices on cars. Reconfigurable intelligent surfaces (RISs) help mitigate this problem by enabling reflection signals in a configurable direction. In turn, result more...
The effective integration of unmanned aerial vehicles (UAVs) in future wireless communication systems depends on the conscious use their limited energy, which constrains flight time. Reconfigurable intelligent surfaces (RISs) can be used combination with UAVs aim to improve performance without increasing complexity at UAVs' side. In this letter, we propose a synergetic UAV-RIS system, utilizing UAV highly directional antenna aiming RIS. proposed scenario applied all air-to-ground...
We present a new approach to Extended Reality (XR), denoted as iCOPYWAVES, which seeks offer naturally low-latency operation and cost effectiveness, overcoming the critical scalability issues faced by existing solutions. iCOPYWAVES is enabled emerging PWEs, recently proposed technology in wireless communications. Empowered intelligent (meta)surfaces, PWEs transform wave propagation phenomenon into software-defined process. leverage to: i) create, then ii) selectively copy scattered RF...
The sixth generation of wireless networks envisions intelligent and adaptive environments capable meeting the demands emerging applications such as immersive extended reality, advanced healthcare, metaverse. However, this vision requires overcoming critical challenges, including limitations conventional technologies in mitigating path loss dynamically adapting to diverse user needs. Among proposed reconfigurable technologies, pinching antenna systems (PASs) offer a novel way turn into...
Future communication systems are envisioned to support applications that require very high data rates in an energy efficient manner. To this direction, the use of hexagonal quadrature amplitude modulation (HQAM) provides and power efficiency, due its compact allocation symbols on 2D plane. However, because lattice, it is difficult, if not impossible, evaluate exactly error probability. In letter, we propose a tight upper bound as well closed-form approximation for symbol probability HQAM,...
Future cooperative autonomous vehicles will require high-performance communication means to support functions such as maneuvering and perception. The high-bandwidth requirements of these can be met through mmWave communications, whose utilization is often hindered by the harsh propagation conditions typical vehicular environments. A solution this problem use reconfigurable intelligent surfaces (RISs), which enable reflection signals in a configurable direction, have recently gained attention...
Internet of Things (IoT) networks are expected to be a key enabler technology for smart cities, due their ability offer real-time monitoring. In this work, we propose novel medium access control (MAC) protocol, inspired by the synergy slotted ALOHA and hybrid automatic repeat request with code combining (HARQ-CC), termed as (CCSA), improve performance IoT multiple randomly deployed sensors. Specifically, provide analytical closed-form expressions network's outage probability well its average...
Future cooperative autonomous vehicles will be able to organize into flexible platoons improve both the efficiency and safety of driving. However, platooning requires dependable coordination through periodic wireless exchange control messages. Therefore, challenging propagation scenarios as found, e.g., in dense urban areas, may hinder lead undesirable vehicle behavior. While reconfigurable intelligent surfaces (RISs) have been advocated a solution improper coverage issues, no system-level...
In this work, we focus on the theoretical modeling and experimental evaluation of UAV-mounted absorbing metasurfaces as facilitators for secure wireless communication channels. Specifically, present a network architecture based conduct comprehensive analysis its components. Furthermore, by utilizing physical optics, develop path loss model that accurately calculates diffraction wavefronts with arbitrary configurations, which enables quantification mobility effects, including pointing...
Massive IoT deployments in smart cities pose a significant challenge to the data collection due harsh wireless channel conditions of dense urban environments. Aerial reconfigurable intelligent surfaces (RIS) carried by Unmanned Vehicles (UAVs) can improve communication thanks their high mobility that provides line-of-sight propagation. In this paper, we investigate impact aerial RIS deriving outage probability randomly-deployed devices, while taking into account imperfect state and UAV...
The rapidly growing demand for vast numbers of Internet Things (IoT), in both urban and rural areas, necessitates their ceaseless automatic energy supply. This is particularly vital cases where the IoT sensors are deployed distant or dangerous locations outside human reach. In this direction, unmanned aerial vehicles (UAVs) with wireless power transfer (WPT) capabilities can address issue, due to flexible deployment. To end, we devise an architecture which a UAV swarm covers network, while...