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165 results on '"Kourogiorgas, Charilaos"'

1. Flexible Capacity Allocation in Smart Gateway Diversity Satellite Systems Using Matching Theory

Author

Roumeliotis, Anargyros J., Kourogiorgas, Charilaos I., Kyrgiazos, Argyrios, Panagopoulos, Athanasios D., Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Pillai, Prashant, editor, Sithamparanathan, Kandeepan, editor, Giambene, Giovanni, editor, Vázquez, Miguel Ángel, editor, and Mitchell, Paul Daniel, editor

Published
2018
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2. Monthly and Seasonal CFLOS Statistics for Optical GEO Feeder Links Design

Author

Lyras, Nikolaos K., Kourogiorgas, Charilaos I., Panagopoulos, Athanasios D., Liolis, Konstantinos P., Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Pillai, Prashant, editor, Sithamparanathan, Kandeepan, editor, Giambene, Giovanni, editor, Vázquez, Miguel Ángel, editor, and Mitchell, Paul Daniel, editor

Published
2018
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3. Large Scale Site Diversity Experimental Campaign Between Greece and UK Using ALPHASAT: First Results

Author

Papafragkakis, Apostolos Z., Kourogiorgas, Charilaos I., Panagopoulos, Athanasios D., Ventouras, Spiros, Arapoglou, Pantelis-Daniel, Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Pillai, Prashant, editor, Sithamparanathan, Kandeepan, editor, Giambene, Giovanni, editor, Vázquez, Miguel Ángel, editor, and Mitchell, Paul Daniel, editor

Published
2018
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4. Propagation Elements for the Link Budget of Broadband Satellite Systems in Ka and Q/V Band

Author

Ventouras, Spiros, Crawford, Paul S., Kourogiorgas, Charilaos I., Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Pillai, Prashant, editor, Sithamparanathan, Kandeepan, editor, Giambene, Giovanni, editor, Vázquez, Miguel Ángel, editor, and Mitchell, Paul Daniel, editor

Published
2018
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24. Ground‐to‐GEO optical feeder links for very high throughput satellite networks: Accent on diversity techniques

Author

Interdisciplinary Centre for Security, Reliability and Trust (SnT) > SIGCOM [research center], FNR, Ministry of Economy [sponsor], Mengali, Alberto, Kourogiorgas, Charilaos, Lyras, Nikolaos, Mysore Rama Rao, Bhavani Shankar, Kayhan, Farbod, Panagopoulos, Athanasios, Bäumer, Thomas, Liolis, Konstantinos, Interdisciplinary Centre for Security, Reliability and Trust (SnT) > SIGCOM [research center], FNR, Ministry of Economy [sponsor], Mengali, Alberto, Kourogiorgas, Charilaos, Lyras, Nikolaos, Mysore Rama Rao, Bhavani Shankar, Kayhan, Farbod, Panagopoulos, Athanasios, Bäumer, Thomas, and Liolis, Konstantinos

Abstract

This paper studies the use of optical feeder links in very high throughput satellites (VHTS) networks with emphasis on gateway diversity techniques to mitigate the inherent propagation losses in optical frequencies. Focusing on a GEO scenario, the paper considers a system‐wide approach investigating various challenges of optical feeder links. These include transmission schemes amenable for transparent on‐board processing, optical channel models taking into account blockage by clouds and fading caused by atmospheric turbulence in addition to complexity of on‐board and on‐ground processing. The channel models are then used to dimension the ground segment towards ensuring a given availability percentage (e.g., 99.9%). The channel model and payload complexity further influence the choice of link layer techniques used for counteracting fading due to atmospheric turbulence in the absence of blockage. An elaborate end‐to‐end simulator incorporating the proposed channel models capturing the nuances of various processing blocks like optical‐electrical conversion is developed. The system performance results provide interesting insights and a framework for assessing the feasibility and advantages of optical feeder links in VHTS systems.

Published
2020

28. Assessment of spatial and temporal properties of Ka/Q band earth‐space radio channel across Europe using Alphasat Aldo Paraboni payload

Author

Ventouras, Spiros, primary, Martellucci, Antonio, additional, Reeves, Richard, additional, Rumi, Emal, additional, Fontan, Fernando P., additional, Machado, Fernando, additional, Pastoriza, Vicente, additional, Rocha, Armando, additional, Mota, Susana, additional, Jorge, Flavio, additional, Panagopoulos, Athanasios D., additional, Papafragkakis, Apostolos Z., additional, Kourogiorgas, Charilaos I., additional, Fiser, Ondrej, additional, Pek, Viktor, additional, Pesice, Petr, additional, Grabner, Martin, additional, Vilhar, Andrej, additional, Kelmendi, Arsim, additional, Hrovat, Andrej, additional, Vanhoenacker‐Janvier, Danielle, additional, Quibus, Laurent, additional, Goussetis, George, additional, Costouri, Alexios, additional, and Nessel, James, additional

Published
2019
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32. Mobile Satellite Channel Characterization

Author

Kourogiorgas Charilaos and Athanasios D. Panagopoulos

Subjects
Virtual Reference Station, Satellite channel, Computer science, Satellite navigation, Remote sensing, Characterization (materials science)
Published
2017
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42. Precoding, Scheduling and Link Adaptation in Mobile Interactive Multibeam Satellite Systems

Author

Vazquez, Miguel-Angel, Shankar, Bhavani, Kourogiorgas, Charilaos, Arapoglou, Pantelis-Daniel, Icolari, Vincenzo, Chatzinotas, Symeon, Panagopoulos, Athanasios, Perez-Neira, Ana, Vazquez, Miguel-Angel, Shankar, Bhavani, Kourogiorgas, Charilaos, Arapoglou, Pantelis-Daniel, Icolari, Vincenzo, Chatzinotas, Symeon, Panagopoulos, Athanasios, and Perez-Neira, Ana

Abstract

This paper deals with the problem of precoding, scheduling and link adaptation in next generation mobile interactive multibeam satellite systems. In contrast to the fixed satellite services, when the user terminals move across the coverage area, additional challenges appear. Due to the time varying channel, the gateway has only access to a delayed version of the channel state information (CSI) which can eventually limit the overall system performance. However, in contrast to general multiuser multipleinput- multiple-output terrestrial systems, the CSI degradation in multibeam mobile applications has a very limited impact for typical fading channel and system assumptions. Under realistic conditions, the numerical results show that precoding can offer an attractive gain in the system throughput compared to conservative frequency reuse allocations.

Published
2018

43. Precoding, scheduling and link adaptation in mobile interactive multibeam satellite systems

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Vázquez Oliver, Miguel Ángel, Bhavani Shankar, M. R., Kourogiorgas, Charilaos, Arapoglou, Pantelis-Daniel, Icolari, Vicenzo, Chatzinotas, Symeon, Panagopoulos, Athanasios D., Pérez Neira, Ana Isabel, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Vázquez Oliver, Miguel Ángel, Bhavani Shankar, M. R., Kourogiorgas, Charilaos, Arapoglou, Pantelis-Daniel, Icolari, Vicenzo, Chatzinotas, Symeon, Panagopoulos, Athanasios D., and Pérez Neira, Ana Isabel

Abstract

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works, This paper deals with the problem of precoding, scheduling and link adaptation in next generation mobile interactive multibeam satellite systems. In contrast to the fixed satellite services, when the user terminals move across the coverage area, additional challenges appear. Due to the time varying channel, the gateway has only access to a delayed version of the channel state information (CSI) which can eventually limit the overall system performance. However, in contrast to general multiuser multipleinput- multiple-output terrestrial systems, the CSI degradation in multibeam mobile applications has a very limited impact for typical fading channel and system assumptions. Under realistic conditions, the numerical results show that precoding can offer an attractive gain in the system throughput compared to conservative frequency reuse allocations., Peer Reviewed, Postprint (author's final draft)

Published
2018

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