20 hasil untuk "Athanasios D. Panagopoulos"
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Artikel Jurnal Teks lengkap
Coexistence of Satellite Ground Stations in Teleport Facilities: Interference Assessment, Real Application Scenario and Measurements
This article introduces a unified and detailed methodology for interference assessment between coexisting fixed satellite service (FSS) and broadcast satellite service (BSS) with spectrum sharing at the Ka-band. The interference analysis is presented along with a step-by-step algorithm for the…
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Artikel Jurnal Teks lengkap
Dynamic Lognormal Shadowing Framework for the Performance Evaluation of Next Generation Cellular Systems
Performance evaluation tools for wireless cellular systems are very important for the establishment and testing of future internet applications. As the complexity of wireless networks keeps growing, wireless connectivity becomes the most critical requirement in a variety of applications (considered…
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Artikel Jurnal Teks lengkap
Power Allocation for Reliable and Energy-Efficient Optical LEO-to-Ground Downlinks with Hybrid ARQ Schemes
Satellites in low earth orbit (LEO) are currently being deployed for numerous communication, positioning, space and Earth-imaging missions. To provide higher data rates in direct-to-user links and earth observation downlinks, the free-space optics technology can be employed for LEO-to-ground…
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Artikel Jurnal
A Robust Machine Learning Approach to Path Loss Prediction for a Low Altitude UAV-to-Ground Urban Scenario
This paper presents a machine learning-based approach for the prediction of path loss of a $2\times 2$ dual-polarized (DP) multiple-input-multiple-output (MIMO) channel. The communication scenario takes into account the link established between an unmanned aerial vehicle (UAV) and a ground terminal…
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Artikel Jurnal Teks lengkap
A Survey of Path Loss Prediction and Channel Models for Unmanned Aerial Systems for System-Level Simulations
Unmanned aerial systems (UAS) have recently gained popularity, and they are envisioned as an integral parts of the current and future wireless and mobile-radio networks. Despite the exhaustive research on air-to-ground channels, there are insufficient studies, experimental campaigns and general…
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Artikel Jurnal
A Survey on Contemporary Terrestrial and Handheld Multimedia Broadcasting Networks
Digital video broadcasting (DVB) transmission technologies are suitable for wireless delivery of multimedia content both to static and mobile end-users. On the one hand, DVB-T standard has been adopted for digital terrestrial television (DTT) and it has been further developed into a newer standard…
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Artikel Jurnal Teks lengkap
Minimization of nth Order Rate Matching in Satellite Networks with One to Many Pairings
This paper studies the minimization of nth (positive integer) order rate matching in high-throughput multi-beam satellite systems, based on one-to-many capacity allocation pairings, for the first time in the literature. The offered and requested capacities of gateways and users’ beams are…
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Artikel Jurnal
Multi-Satellite MIMO Communications at Ku-Band and Above: Investigations on Spatial Multiplexing for Capacity Improvement and Selection Diversity for Interference Mitigation
This paper investigates the applicability of multiple-input multiple-output (MIMO) technology to satellite communications at the Ku-band and above. After introducing the possible diversity sources to form a MIMO matrix channel in a satellite environment, particular emphasis is put on satellite…
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Artikel Jurnal
Dynamic Optimal Vehicle Selection for Cooperative Positioning Using Low-Cost GNSS Receivers
The recent developments in the Global Navigation Satellite Systems (GNSS) and the advent of Intelligent Transportation Systems (ITS) have accelerated the need for accurate, reliable, and robust land vehicle positioning. Current low-cost, single-frequency GNSS receivers are universally available and…
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Artikel Jurnal
An Analytical Prediction Model of Time Diversity Performance for Earth-Space Fade Mitigation
Time diversity (TD) has recently attracted attention as a promising and cost-efficient solution for high-frequency broadcast satellite applications. The present work proposes a general prediction model for the application of TD by approximating the time dynamics of rain attenuation through the use…
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Artikel Jurnal Teks lengkap
Cooperative D-GNSS Aided with Multi Attribute Decision Making Module: A Rigorous Comparative Analysis
Satellite positioning lies within the very core of numerous Intelligent Transportation Systems (ITS) and Future Internet applications. With the emergence of connected vehicles, the performance requirements of Global Navigation Satellite Systems (GNSS) are constantly pushed to their limits. To this…
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A Review of ARIMA vs. Machine Learning Approaches for Time Series Forecasting in Data Driven Networks
In the broad scientific field of time series forecasting, the ARIMA models and their variants have been widely applied for half a century now due to their mathematical simplicity and flexibility in application. However, with the recent advances in the development and efficient deployment of…
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Artikel Jurnal
Performance analysis of multiuser dual-hop satellite relaying systems
Abstract In this study, we investigate the outage probability (OP) of a multiuser dual-hop satellite relaying system with decode-and-forward (DF) protocol, where both uplink and downlink experience Shadowed Rician (SR) fading. Specifically,by taking the effects of antenna pattern and path loss into…
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Artikel Jurnal Teks lengkap
Time Series Irradiance Synthesizer for Optical GEO Satellite Downlinks in 5G Networks
Next generation 5G networks generate a need for broadband, low latency and power efficient backhauling and data-relay services. In this paper, optical satellite communications links, as an integrated component of 5G networks, are studied. More specifically, the Geostationary (GEO)…
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Artikel Jurnal Teks lengkap
Toward Converged Satellite/Fiber 1550 nm DS-BB84 QKD Networks: Feasibility Analysis and System Requirements
Satellite-based QKD is currently being developed to revolutionize global cryptographic key exchange by facilitating secure communication among remote parties at a global scale. By overcoming the exponential loss of fiber transmission, satellite-to-Earth communication can seamlessly interconnect…
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Artikel Jurnal Teks lengkap
LEO Satellites Constellation-to-Ground QKD Links: Greek Quantum Communication Infrastructure Paradigm
Quantum key distribution (QKD) has gained a lot of attention over the past few years, but the implementation of quantum security applications is still challenging to accomplish with the current technology. Towards a global-scale quantum-secured network, satellite communications seem to be a…
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Artikel Jurnal
Feasibility of C‐Band Converged Satellite‐Fibre QKD Links Through Telescope‐to‐SMF Coupling
ABSTRACT This study presents a comprehensive feasibility analysis of low Earth orbit (LEO) satellite‐to‐ground downlink communication for quantum key distribution (QKD), focusing on 1550 nm wavelength. This wavelength is selected for its compatibility with terrestrial fibre‐optic networks, allowing…
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Artikel Jurnal
Practical approach to last-mile converged free-space and fiber QKD for secure city-scale networks
Abstract Current Free-Space Optical Quantum Key Distribution (FSO-QKD) systems are mainly focusing on the development of critical components needed towards the realization of satellite-based QKD, relying on bulky optical telescopes equipped with expensive optical systems. The cost and complexity of…