subject:(Satcom)

1. Tauran, Bastien. On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite.

Degree: Docteur es, Réseaux, télécom, système et architecture, 2018, Toulouse, ISAE

URL: http://www.theses.fr/2018ESAE0035

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L'accès à Internet par satellite permet de connecter des régions isolées de la terre ou des utilisateurs en mouvement, pour lesquels une solution terrestre peut… (more)

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L'accès à Internet par satellite permet de connecter des régions isolées de la terre ou des utilisateurs en mouvement, pour lesquels une solution terrestre peut s’avérer couteuse voire impossible. L’utilisation de constellations de satellite en orbite basse permet de transmettre avec des délais similaires à ceux des transmissions terrestres, permettant l’utilisation des protocoles de transport classiques comme TCP. L’utilisation d’un tel environnement engendre cependant des contraintes spécifiques à ce type de réseau, comme des délais de transmission variables et un important taux d’erreur, principalement lors de la traversée de l’atmosphère. Pour compenser ces forts taux de pertes, des mécanismes de fiabilisation doivent être introduit au niveau des couche basse. Ces mécanismes ont toutefois un impact négatif sur les performances des protocoles de transport, notamment TCP, limitant grandement le débit. Le but de cette thèse est de comprendre dans un premier temps les interactions entre les mécanismes de fiabilisation et les protocoles de transport, pour ensuite proposer des solutions permettant d’améliorer la qualité des transmissions.

LEO satellite constellations allow to connect isolated or mobile users to the Internet, when terrestrial solutions are too expensive or impossible to deploy. Using such constellations allow to connect these areas with transmission delays close to terrestrial delays, and then to use the classic transport protocols such as TCP. However, this environment brings new impairments such as variable delays and important error rate between the satellite and the ground receiver. To counteract this high error rate, reliability schemes are introduced on the link between the satellite and the ground user. However, these schemes have a negative impact on the transport protocol (TCP), mitigating the throughput, and which has not been deeply studied yet. In this thesis, we first understand the impact of the reliability schemes on the transport layer, and then propose solutions to improve the efficiency of the transmissions.

Advisors/Committee Members: Lochin, Emmanuel (thesis director), Lacan, Jérôme (thesis director).

Subjects/Keywords: TCP; Fiabilisation; Services mobiles; Liens Satcom; TCP; Reliability; Mobile services; Satcom links

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tauran, B. (2018). On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite. (Doctoral Dissertation). Toulouse, ISAE. Retrieved from http://www.theses.fr/2018ESAE0035

Chicago Manual of Style (16^th Edition):

Tauran, Bastien. “On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite.” 2018. Doctoral Dissertation, Toulouse, ISAE. Accessed January 21, 2021. http://www.theses.fr/2018ESAE0035.

MLA Handbook (7^th Edition):

Tauran, Bastien. “On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite.” 2018. Web. 21 Jan 2021.

Vancouver:

Tauran B. On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite. [Internet] [Doctoral dissertation]. Toulouse, ISAE; 2018. [cited 2021 Jan 21]. Available from: http://www.theses.fr/2018ESAE0035.

Council of Science Editors:

Tauran B. On the interaction between transport protocols and link-layer reliability schemes for satellite mobile services : Sur l'interaction entre protocoles de transport et fiabilisation couche liaison pour services mobile satellite. [Doctoral Dissertation]. Toulouse, ISAE; 2018. Available from: http://www.theses.fr/2018ESAE0035

Brno University of Technology

2. Hoferek, Jakub. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/80950

This paper deals with the modeling of receiver properties for the transfer of command information for unmanned airplanes. Advisors/Committee Members: Maršálek, Roman (advisor), Prokeš, Aleš (referee).

Subjects/Keywords: BLOS; CPM; CNPC; Matlab; SDR; Satcom; UAV}; BLOS; CPM; CNPC; Matlab; SDR; Satcom; UAV

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hoferek, J. (2019). Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/80950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hoferek, Jakub. “Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.” 2019. Thesis, Brno University of Technology. Accessed January 21, 2021. http://hdl.handle.net/11012/80950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hoferek, Jakub. “Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.” 2019. Web. 21 Jan 2021.

Vancouver:

Hoferek J. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/11012/80950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hoferek J. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/80950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Diaby, Fatimata. Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves.

Degree: Docteur es, Optique et radiofrequences, 2018, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2018GREAT125

► De nos jours, les antennes à réseaux transmetteurs attirent un grand intérêt pour de nombreuses applications civiles et militaires aux bandes de fréquence comprises entre… (more)

▼ De nos jours, les antennes à réseaux transmetteurs attirent un grand intérêt pour de nombreuses applications civiles et militaires aux bandes de fréquence comprises entre 10 et 110 GHz (réseaux de communication 5G, liens point à point, radars, etc.).Le travail de thèse vise à faire des innovations dans la modélisation et la conception d'antennes à réseaux transmetteurs pour des applications en bande Ka (28-40 GHz). Il porte plus précisément sur le développement d'outils numériques pour l’analyse théorique des réseaux transmetteurs, la conception et la démonstration de plusieurs prototypes avec des fonctionnalités avancées, telles que des réseaux transmetteurs passifs (larges bandes ou à multifaisceaux) et actifs (à reconfiguration électronique).La première partie des travaux consiste en une analyse théorique des réseaux transmetteurs. Dans un premier temps, l’impact de la méthode de compensation de phase sur les performances des réseaux transmetteurs est étudié. La loi de compensation de phase de l’onde quasi-sphérique incidente sur l’ouverture du réseau transmetteur est calculée en utilisant deux méthodes nommées compensation à phase constante et compensation par ligne à retard, et nous montrons que cette dernière permet d’augmenter la bande passante du réseau transmetteur et de corriger les erreurs de dépointage du faisceau. Dans un second temps, le principe de fonctionnement des réseaux transmetteurs facettés est décrit en détail. La simulation numérique du réseau transmetteur à trois facettes est validée au travers de simulations électromagnétiques 3-D. Pour un certain angle d’inclinaison, nous montrons que la bande passante et la capacité de dépointage du réseau transmetteur sont améliorées au détriment du gain.La suite des travaux porte sur la conception et le prototypage de deux réseaux transmetteurs passifs, dont l’un à faisceau collimaté et très large bande et l’autre à quatre faisceaux fixes. Les deux réseaux transmetteurs sont basés sur une cellule élémentaire à 3bits qui assure une double fonction à savoir la compensation de phase et la conversion de la polarisation linéaire en circulaire. Le réseau passif à faisceau collimaté présente un gain mesuré de 33,8 dBi (correspondant à une efficacité d'ouverture de 51,2%) et une bande passante à -3 dB supérieure à 15,9%. La distribution de phase du réseau transmetteur à quatre faisceaux a été optimisée par un algorithme génétique afin d’avoir des faisceaux dépointés à ± 25° dans le plan horizontal et le plan vertical à la fréquence d’optimisation.La dernière partie des travaux vise la conception d’un réseau transmetteur reconfigurable à 27-31 GHz. Dans un premier temps, une cellule élémentaire active à quatre états de phase (2 bits) en polarisation linéaire a été conçue et validée expérimentalement. Elle est composée de six couches métalliques imprimées sur trois substrats. Les éléments rayonnants sont des antennes patch rectangulaires comprenant chacun deux diodes PIN pour contrôler la phase de transmission. Le principe de fonctionnement de la cellule… Advisors/Committee Members: Dussopt, Laurent (thesis director).

Subjects/Keywords: Antennes à réseau transmetteur; Antennes à dépointage électronique; Antennes reconfigurable; Fréquences millimétriques; Bande Ka; Satcom; Transmittaray antennas; Electronically beam-Steering antenna; Reconfigurable antennas; Millimeter frequencies; Ka-Band; Satcom system; 620

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Diaby, F. (2018). Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2018GREAT125

Chicago Manual of Style (16^th Edition):

Diaby, Fatimata. “Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves.” 2018. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed January 21, 2021. http://www.theses.fr/2018GREAT125.

MLA Handbook (7^th Edition):

Diaby, Fatimata. “Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves.” 2018. Web. 21 Jan 2021.

Vancouver:

Diaby F. Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2018. [cited 2021 Jan 21]. Available from: http://www.theses.fr/2018GREAT125.

Council of Science Editors:

Diaby F. Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique : Reconfigurable transmitarrays for beam-steering and beam -forming at millimeter-waves. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2018. Available from: http://www.theses.fr/2018GREAT125

Brno University of Technology

4. Hoferek, Jakub. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/84285

► This diploma thesis deals with the simulation of the radio communication system for satellite control of unmanned aircraft, namely the command and control communication link… (more)

Subjects/Keywords: bezdrátový; BLOS; CPM; CNPC; Matlab; přijímač; rádiový kanál; SDR; simulátor; Satcom; satelit; UAV; vysílač; BLOS; channel; CPM; CNPC; Matlab; Receiver; SDR; Simulator; Satelite; Satcom; Transmitter; UAV; Wireless

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hoferek, J. (2019). Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/84285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hoferek, Jakub. “Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.” 2019. Thesis, Brno University of Technology. Accessed January 21, 2021. http://hdl.handle.net/11012/84285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hoferek, Jakub. “Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft.” 2019. Web. 21 Jan 2021.

Vancouver:

Hoferek J. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/11012/84285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hoferek J. Modelování a simulace příjímače komunikačního systému pro bezpilotní letadla: Modelling and simulation of communication system receiver for unmanned aircraft. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/84285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Pham, Trung-Kien. Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band.

Degree: Docteur es, Électronique, 2017, Rennes 1

URL: http://www.theses.fr/2017REN1S065

► Dans les systèmes de communication et de détection sans fil, l'antenne est un élément indispensable pour transformer l'énergie électrique en ondes électromagnétiques rayonnée dans l'espace,… (more)

▼ Dans les systèmes de communication et de détection sans fil, l'antenne est un élément indispensable pour transformer l'énergie électrique en ondes électromagnétiques rayonnée dans l'espace, et vice versa. Les antennes sont utilisées dans de nombreux dispositifs militaires et civils, tels que les radars (SAR, secteur automobile, détection de débris, etc.), les instruments biomédicaux, les systèmes de télécommunication (téléphones mobiles, stations de base) pour les communications point à multi-point ou point à point par exemple. Les antennes jouent aussi un rôle essentiel pour le développement de futurs réseaux connectés reliant plusieurs appareils à des utilisateurs en temps réel, par exemple pour l'Internet des objets (IoT). Les réseaux transmetteurs sont une solution attrayante pour de nombreuses applications telles que les communications par satellite (Satcom) ou les futurs réseaux 5G. L'architecture des antennes à réseau transmetteur les rend extrêmement compétitifs comparés aux réseaux phasés par exemple grâce à leur alimentation par onde d’espace et car ils ne souffrent pas du blocage induit par la source primaire, comme c’est le cas pour les réseaux réflecteurs ou les antennes à réflecteur. Grâce à leur fonctionnement en mode transmission, les réseaux transmetteurs peuvent être également facilement montés sur des plates-formes mobiles.Les applications Satcom en bande Ka constituent le secteur applicatif majeur de cette thèse. Cette bande fournit un débit de données élevé à la fois pour les liaisons descendantes et les liaisons montantes, en remplacement des systèmes actuels en bande Ku. Dans ce contexte, il convient aussi de prêter une attention particulière aux communications avec des plates-formes mobiles, par exemple les trains à grande vitesse, les avions, etc., ce qui nécessite de mettre au point des antennes à balayage de faisceau. De nombreuses propriétés avancées sont exploitées depuis ces dernières années pour accroître les débits et la flexibilité des systèmes de communication sans fil, par exemple la polarisation circulaire, la double polarisation, le fonctionnement multi-fréquence ou large bande, le dépointage électronique de faisceau. Pour réduire les coûts, des preuves de concept de réseaux transmetteurs non diélectriques sont également proposées. Cette thèse s’est déroulée dans le cadre du projet ANR TRANSMIL (Reconfigurable TRANSmitarrays for beam steering and beam forming at MILlimetre wave). Les objectifs de cette thèse sont de proposer de nouvelles architectures de réseaux transmetteurs fonctionnant en bande Ka en liaison descendante (de 17,7 GHz à 21,2 GHz) et en liaison montante (de 27,5 GHz à 31 GHz). Différents prototypes ont été conçus et fabriqués afin de valider les concepts proposés en bande X et en bande Ka. Un bon accord entre les résultats numériques et mesurés a été obtenu systématiquement. En particulier, les réseaux transmetteurs à double polarisation que nous avons conçus en bande X présentent un gain de 25 dBi et une bande passante à 3 dB de 20% à 10 GHz. Ces propriétés sont… Advisors/Committee Members: Sauleau, Ronan (thesis director).

Subjects/Keywords: Réseau transmetteur; Réseau réflecteurs; Double polarisation; Bi-Bande; Algorithme génétique; Bande Ka; Satcom; Transmitarray antennas; Reflectarray antennas; Dual-Polarization; Dual-Band; Genetic algorithm; Ka-Band; Satcom

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pham, T. (2017). Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band. (Doctoral Dissertation). Rennes 1. Retrieved from http://www.theses.fr/2017REN1S065

Chicago Manual of Style (16^th Edition):

Pham, Trung-Kien. “Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band.” 2017. Doctoral Dissertation, Rennes 1. Accessed January 21, 2021. http://www.theses.fr/2017REN1S065.

MLA Handbook (7^th Edition):

Pham, Trung-Kien. “Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band.” 2017. Web. 21 Jan 2021.

Vancouver:

Pham T. Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band. [Internet] [Doctoral dissertation]. Rennes 1; 2017. [cited 2021 Jan 21]. Available from: http://www.theses.fr/2017REN1S065.

Council of Science Editors:

Pham T. Étude et conception de réseaux transmetteurs reconfigurables en bande Ka : Study and design of reconfigurable transmitarray antennas in Ka-band. [Doctoral Dissertation]. Rennes 1; 2017. Available from: http://www.theses.fr/2017REN1S065

6. Holland, Steven S. Low-profile, Modular, Ultra-Wideband Phased Arrays.

Degree: PhD, Electrical and Computer Engineering, 2011, U of Massachusetts : PhD

URL: https://scholarworks.umass.edu/open_access_dissertations/450

► Ultrawideband (UWB) phased antenna arrays are critical to the success of future multi-functional communication, sensing, and countermeasure systems, which will utilize a few UWB… (more)

Subjects/Keywords: antenna arrays; common mode; dipole; planar arrays; SATCOM; ultrawideband; Electrical and Computer Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Holland, S. S. (2011). Low-profile, Modular, Ultra-Wideband Phased Arrays. (Doctoral Dissertation). U of Massachusetts : PhD. Retrieved from https://scholarworks.umass.edu/open_access_dissertations/450

Chicago Manual of Style (16^th Edition):

Holland, Steven S. “Low-profile, Modular, Ultra-Wideband Phased Arrays.” 2011. Doctoral Dissertation, U of Massachusetts : PhD. Accessed January 21, 2021. https://scholarworks.umass.edu/open_access_dissertations/450.

MLA Handbook (7^th Edition):

Holland, Steven S. “Low-profile, Modular, Ultra-Wideband Phased Arrays.” 2011. Web. 21 Jan 2021.

Vancouver:

Holland SS. Low-profile, Modular, Ultra-Wideband Phased Arrays. [Internet] [Doctoral dissertation]. U of Massachusetts : PhD; 2011. [cited 2021 Jan 21]. Available from: https://scholarworks.umass.edu/open_access_dissertations/450.

Council of Science Editors:

Holland SS. Low-profile, Modular, Ultra-Wideband Phased Arrays. [Doctoral Dissertation]. U of Massachusetts : PhD; 2011. Available from: https://scholarworks.umass.edu/open_access_dissertations/450

7. Watson, Dennis George. Virtual SATCOM, Long Range Broadband Digital Communications.

Degree: PhD, Electrical/Computer Engineering, 2020, Old Dominion University

URL: 9798617088559 ; https://digitalcommons.odu.edu/ece_etds/211

► The current naval strategy is based on a distributed force, networked together with high-speed communications that enable operations as an intelligent, fast maneuvering force.… (more)

▼ The current naval strategy is based on a distributed force, networked together with high-speed communications that enable operations as an intelligent, fast maneuvering force. Satellites, the existing network connector, are weak and vulnerable to attack. HF is an alternative, but it does not have the information throughput to meet the distributed warfighting need. The US Navy does not have a solution to reduce dependency on space-based communication systems while providing the warfighter with the required information speed. Virtual SATCOM is a solution that can match satellite communications (SATCOM) data speed without the vulnerable satellite. It is wireless communication on a High Frequency (HF) channel at SATCOM speed. We have developed an innovative design using high power and gain, ground-based relay systems. We transmit extremely wide-wideband HF channels from ground stations using large directional antennas. Our system starts with a highly directional antenna with a narrow beam that enables increased bandwidth without interfering with other spectrum users. The beam focus and power provide a high SNR across a wideband channel with data rates of 10 Mbps; 1000 times increase in HF data speed. Our modeling of the ionosphere shows that the ionosphere has more than adequate bandwidth to communicate at 3000 km and high speeds while avoiding detection. We designed a flexible structure adjustable to the dynamic ionosphere. Our design provides a high-speed communications path without the geo-location vulnerability of legacy HF methods. Our invention will benefit mobile users using steerable beam forming apertures with wide bandwidth signals. This dissertation will focus on three areas: an examination of the ionosphere’s ability to support the channel, design of a phased array antenna that can produce the narrow beam, and design of signal processing that can accommodate the wideband HF frequency range. Virtual SATCOM is exciting research that can reduce cost and increase access to long-range, high data rate wireless communications. Advisors/Committee Members: Linda Vahala, Dimitrie Popescu, Otilia Popescu, Jose Fernandez.

Subjects/Keywords: Communications; Ionospher; Radio frequency; SATCOM; Wide bandwidth; Wireless; Computer Engineering; Digital Communications and Networking; Signal Processing; Systems and Communications

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Watson, D. G. (2020). Virtual SATCOM, Long Range Broadband Digital Communications. (Doctoral Dissertation). Old Dominion University. Retrieved from 9798617088559 ; https://digitalcommons.odu.edu/ece_etds/211

Chicago Manual of Style (16^th Edition):

Watson, Dennis George. “Virtual SATCOM, Long Range Broadband Digital Communications.” 2020. Doctoral Dissertation, Old Dominion University. Accessed January 21, 2021. 9798617088559 ; https://digitalcommons.odu.edu/ece_etds/211.

MLA Handbook (7^th Edition):

Watson, Dennis George. “Virtual SATCOM, Long Range Broadband Digital Communications.” 2020. Web. 21 Jan 2021.

Vancouver:

Watson DG. Virtual SATCOM, Long Range Broadband Digital Communications. [Internet] [Doctoral dissertation]. Old Dominion University; 2020. [cited 2021 Jan 21]. Available from: 9798617088559 ; https://digitalcommons.odu.edu/ece_etds/211.

Council of Science Editors:

Watson DG. Virtual SATCOM, Long Range Broadband Digital Communications. [Doctoral Dissertation]. Old Dominion University; 2020. Available from: 9798617088559 ; https://digitalcommons.odu.edu/ece_etds/211

Universitat Politècnica de València

8. Ferrando Rocher, Miguel. Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications .

Degree: 2019, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/115933

► [ES] Esta tesis aborda temas de especial interés en el diseño de antenas en la banda de milimétricas. Hui en dia, implementar components passius per… (more)

▼ [ES] Esta tesis aborda temas de especial interés en el diseño de antenas en la banda de milimétricas. Hui en dia, implementar components passius per a operar en la banda de mil·limètriques i assegurar el contacte i l'alineament metàl·lic apropiat entre peces, resulta un desafiament complex. Habitualment les línies de transmissió i les guies d'ones metàl·liques són les solucions adoptades, però en el primer cas es presenten pèrdues al ser solucions impreses i en el segon cas un mal contacte metàl·lic comporta fugues de camp. Per tant, s'estan explorant nous conceptes que solucionen estos problemes. La tecnología Gap Waveguide (GW) resulta adecuada ya que no requiere de contactos metálicos. En los últimos años han surgido las agrupaciones de antenas basadas en la tecnología Gap Waveguide y son un candidato prometedor para satisfacer algunas de las necesidades mencionadas. La tecnología GW ha demostrado ser atractiva para dispositivos de milimétricas porque permite redes de distribución completamente metálicas de una manera más simple que las guías de onda convencionales. Por tanto, estas redes tienen muy bajas pérdidas pero además son simples de fabricar. Esto es posible gracias a la capacidad de las GW de confinar de forma segura la propagación de ondas electromagnéticas por medio de una estructura que no requiere de contacto. Durante la última década, se han hecho avances importantes en la tecnología GW y en la literatura se pueden encontrar un buen número de antenas basadas en GW. Esta tesis va un paso más allá en la contribución de este tipo de antenas. Aquí, no solo se presentan antenas con polarización lineal, como suelen ser las desarrolladas hasta ahora, sino también con polarización dual, circular y duales en banda. Estas aportaciones son especialmente atractivas dentro del campo de las comunicaciones por satélite en movimiento (SATCOM on-the-move). Además, se han explorado nuevas redes de distribución que permiten antenas planas más compactas, más ligeras.; [CAT] Esta tesi aborda temes d'especial interés en el disseny d'antenes en la banda de mil.limètriques. Hui en dia, implementar components passius per a operar en longituds d'onda tan xicotetes (de l'orde de mil.límetres) i assegurar el contacte i l'alineament metàl-lic apropiat entre peces, resulta un desafiament complex. Habitualment les línies de transmissió i les guia d'ones metàl.liques són les solucions adoptades, però en el primer cas es presenten pèrdues al ser solucions impreses i en el segon cas un mal contacte metàl.lic comporta fugues de camp. Per tant, s'estan explorant nous conceptes que solucionen estos problemes. La tecnologia Gap Waveguide (GW) resulta adequada ja que no requerix de contactes metàl.lics. En els últims anys han sorgit les agrupacions d'antena basades en la tecnologia Gap Waveguide i són un candidat prometedor per a satisfer algunes de les necessitats mencionades. La tecnologia GW ha demostrat ser atractiva per a dispositius de banda d'ones mil-limètriques perquè permet xarxes de distribució completament metàl-liques… Advisors/Committee Members: Herranz Herruzo, José Ignacio (advisor), Valero Nogueira, Alejandro (advisor).

Subjects/Keywords: Gap Waveguide; Array; SATCOM; Satcom-on-the-move; Ka-band; K-band; Dual-Band; Dual-Polarized; Circularly-Polarized; Antenna; Antena; Antenas; GW; Corporate-feed networks; 5G; Milimétricas; Mm-wave; Ondas; Guía de onda; Waveguide

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ferrando Rocher, M. (2019). Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/115933

Chicago Manual of Style (16^th Edition):

Ferrando Rocher, Miguel. “Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications .” 2019. Doctoral Dissertation, Universitat Politècnica de València. Accessed January 21, 2021. http://hdl.handle.net/10251/115933.

MLA Handbook (7^th Edition):

Ferrando Rocher, Miguel. “Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications .” 2019. Web. 21 Jan 2021.

Vancouver:

Ferrando Rocher M. Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2019. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10251/115933.

Council of Science Editors:

Ferrando Rocher M. Gap Waveguide Array Antennas and Corporate-Feed Networks for mm-Wave band Applications . [Doctoral Dissertation]. Universitat Politècnica de València; 2019. Available from: http://hdl.handle.net/10251/115933

9. Ogilvie, Timothy Bryan. A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band.

Degree: MS, Electrical Engineering, 2013, Cal Poly

URL: https://digitalcommons.calpoly.edu/theses/1051 ; 10.15368/theses.2013.87

► Phased arrays are electromagnetic antenna systems comprised of many radiating elements and processing electronics. Radiating elements are typically positioned in an orderly grid within… (more)

▼ Phased arrays are electromagnetic antenna systems comprised of many radiating elements and processing electronics. Radiating elements are typically positioned in an orderly grid within the antenna aperture. In the receive mode of operation, radiating elements capture some of the signal energy from incoming radiation and guide these signals to processing electronics. Signals are filtered and amplified to maintain the desired sensitivity and complexly weighted using circuits with reconfigurable amplification gain and phase delay. Finally, all signals are combined. The summation of these complexly weighted spatial samples forms a spatial filter in the same way complexly weighted temporal samples establish a temporal filter in a finite impulse response discrete-time filter. Therefore, a phased array behaves like a spatial filter that strongly favors signals arriving from a specific direction. This favored direction represents the look angle of its beam, and the shape of the beam directly relates to the complex weights applied to the signals in the array. Analogous to the flexibility offered by digital filters, phased arrays enable agile beam steering, sidelobe control, and multiple independent beams. These capabilities have revolutionized radar, radioastronomy, and communication systems. Phased arrays have increasingly employed printed circuit board (PCB) fabrication techniques and processes to maximize array channel density, achieve lower profile, and minimize component integration cost. A few applications which leverage these qualities include low-cost radar, mobile satellite communication (SATCOM), and intelligence, surveillance, and reconnaissance (ISR). Further, PCB-based arrays readily accommodate advancements in highly integrated beamforming radio frequency integrated circuits (RFICs), multi-chip modules, and RF micro-electro-mechanical system (MEMS) device technologies. On a prior effort, an integrated unit cell design was developed for a PCB-based SATCOM array application. However, the design failed to meet the requirements. The primary objective of this work is to demonstrate an improved design using systematic microwave design techniques and modern analysis tools to meet the requirements for the same application. The proposed design must improve gain, bandwidth, size, and manufacturability over the prior design. Additionally, the design must be generally extensible to phased array implementations across the SHF band (3-30 GHz). This work discusses the advantages of phased arrays over continuous apertures (e.g. reflectors), reviews phased array theory, and proposes an improved unit cell design. The proposed design is 35% smaller than a dime and consists of an orthogonally-fed, slot-coupled stacked patch antenna and dual-stage branchline coupler implemented in a multilayer PCB. Within the operating band from 10.7 to 14.5 GHz, the design achieves an average return loss of 15 dB, a uniform radiation pattern with peak realized gain of 4.8 to 7.0 dBic, cross-polarization level below -17 dB,… Advisors/Committee Members: Dennis Derickson.

Subjects/Keywords: Phased Array; Electrically Scanned Array; Unit Cell Antenna; X-Ku Band SATCOM; Printed Antenna; Electrical and Electronics; Electromagnetics and Photonics; Systems and Communications

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ogilvie, T. B. (2013). A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/1051 ; 10.15368/theses.2013.87

Chicago Manual of Style (16^th Edition):

Ogilvie, Timothy Bryan. “A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band.” 2013. Masters Thesis, Cal Poly. Accessed January 21, 2021. https://digitalcommons.calpoly.edu/theses/1051 ; 10.15368/theses.2013.87.

MLA Handbook (7^th Edition):

Ogilvie, Timothy Bryan. “A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band.” 2013. Web. 21 Jan 2021.

Vancouver:

Ogilvie TB. A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band. [Internet] [Masters thesis]. Cal Poly; 2013. [cited 2021 Jan 21]. Available from: https://digitalcommons.calpoly.edu/theses/1051 ; 10.15368/theses.2013.87.

Council of Science Editors:

Ogilvie TB. A Novel Unit Cell Antenna For Highly Integrated Phased Arrays in the SHF Band. [Masters Thesis]. Cal Poly; 2013. Available from: https://digitalcommons.calpoly.edu/theses/1051 ; 10.15368/theses.2013.87

Université du Luxembourg

10. Krivochiza, Jevgenij. End-to-end Signal Processing Algorithms for Precoded Satellite Communications.

Degree: 2020, Université du Luxembourg

URL: http://orbilu.uni.lu/handle/10993/44739

► The benefits of full frequency reuse in satellite communications consist of increased spectral efficiency, physical layer security, enhanced coverage, and improved Quality of Service. This… (more)

▼ The benefits of full frequency reuse in satellite communications consist of increased spectral efficiency, physical layer security, enhanced coverage, and improved Quality of Service. This is possible due to novel digital signal processing techniques for interference mitigation as well as signal predistortion in non-linear high-performance amplifiers. Advanced linear precoding and symbol-level precoding can jointly address the signal processing demands in the next-generation satellite communications. The real-time signal precoding increases the computational complexity handled at the gateway, thus requiring low-complexity high-performance algorithms to be developed. Additionally, extensive in-lab and field tests are required to increase the technology readiness level and industrial adaption rate. In this thesis, we focus on low-complexity precoding design and in-lab validations. We study the state-of-the-art linear and symbol-level precoding techniques and multi-user MIMO test-beds available in the literature. First, we present a novel low-complexity algorithm for sum power minimization precoding design. This technique allows to reduce transmitted power in a multi-beam satellite system and improves the quality of the received signal at user terminals. Next, we demonstrate an FPGA accelerated high-throughput precoding design. The FPGA precoding design is scalable for a different number of beams in the systems and operates in a real-time processing regime using a commercially available software defined radio platform. One of the highlights of this research is the creation of a real-time in-lab precoding test-bed. The test-bed consists of a DVB-S2X precoding enabled gateway prototype, a MIMO channel emulator, and user terminals. By using the radio frequency for transmitting and receiving the precoded signals, we can test the performance of different precoding techniques in realistic scenarios and channel impairments. We demonstrate an end-to-end symbol-level precoded real-time transmission, in which user terminals can acquire and decode the precoded signals showing an increase in performance and throughput. The in-lab validations confirm numerical results conducted alongside in this work. Advisors/Committee Members: Interdisciplinary Centre for Security, Reliability and Trust (SnT) >, SIGCOM [research center], Chatzinotas, Symeon [superviser], Ottersten, Björn [superviser], Krause, Jens [superviser], Olivares Mendez, Miguel Angel [president of the jury], Tufvesson, Fredrik [member of the jury].

Subjects/Keywords: Precoding; SATCOM; Test-bed; full frequency reuse; MIMO; FPGA; SLP; Engineering, computing & technology :: Computer science [C05]; Ingénierie, informatique & technologie :: Sciences informatiques [C05]

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Krivochiza, J. (2020). End-to-end Signal Processing Algorithms for Precoded Satellite Communications. (Doctoral Dissertation). Université du Luxembourg. Retrieved from http://orbilu.uni.lu/handle/10993/44739

Chicago Manual of Style (16^th Edition):

Krivochiza, Jevgenij. “End-to-end Signal Processing Algorithms for Precoded Satellite Communications.” 2020. Doctoral Dissertation, Université du Luxembourg. Accessed January 21, 2021. http://orbilu.uni.lu/handle/10993/44739.

MLA Handbook (7^th Edition):

Krivochiza, Jevgenij. “End-to-end Signal Processing Algorithms for Precoded Satellite Communications.” 2020. Web. 21 Jan 2021.

Vancouver:

Krivochiza J. End-to-end Signal Processing Algorithms for Precoded Satellite Communications. [Internet] [Doctoral dissertation]. Université du Luxembourg; 2020. [cited 2021 Jan 21]. Available from: http://orbilu.uni.lu/handle/10993/44739.

Council of Science Editors:

Krivochiza J. End-to-end Signal Processing Algorithms for Precoded Satellite Communications. [Doctoral Dissertation]. Université du Luxembourg; 2020. Available from: http://orbilu.uni.lu/handle/10993/44739

11. Broussard, Elliot. Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move.

Degree: Docteur es, Automatique, 2018, Lyon

URL: http://www.theses.fr/2018LYSEI090

►

Les systèmes de communication prennent de nos jours une importance de plus en plus prépondérante dans tous les aspects de la vie courante et les… (more)

▼

Les systèmes de communication prennent de nos jours une importance de plus en plus prépondérante dans tous les aspects de la vie courante et les exigences de connectivité se retrouvent dorénavant dans de très nombreux projets. Ces besoins de connexion exigent des débits de communication ainsi que des taux de couverture de plus en plus importants, poussant de ce fait vers l’utilisation de systèmes de communication par satellite (SATCOM). Les applications envisagées n’étant pas limitées à des installations fixes, celles-ci demandent de pouvoir assurer une communication par satellite depuis un porteur en mouvement. Il est donc nécessaire d’utiliser des servomécanismes de positionnement de l’antenne de façon à assurer un pointage correct de l’antenne vers le satellite. Ces positionneurs sont donc asservis de façon à orienter la ligne de visée de l’antenne vers le satellite, avec une erreur angulaire de l’ordre du dixième de degré. Cette précision a pour conséquences certaines exigences fortes sur la conception. Ces contraintes imposent l’utilisation de composants de qualité supérieure, des études mécaniques poussées ainsi que des réglages propres à chaque positionneur après assemblage. Dans le cadre de ces travaux de thèse, une stratégie de pointage différente de l’état de l’art a été conçue. Cette stratégie, nommée Helios (Hybrid Estimator of Line Of Sight), permet de lever certains verrous scientifiques spécifiques. Notamment, elle permet une diminution des performances requises de l’asservissement en position de l’antenne en fournissant une trajectoire plus facile à suivre. Cela permet une diminution des contraintes de conception, notamment mécaniques (frottements, raideurs …). Cela est rendu possible par une meilleure estimation de la direction à pointer, utilisant un plus grand nombre de mesures, sans introduire de retard dans l’estimation. Les moyens d’essais de Thales ont permis d’effectuer des essais expérimentaux sur des prototypes industriels. Ainsi, la stratégie est testée en simulation et en expérimentation sur un hexapode simulant un porteur, permettant un recalage du modèle de simulation à partir de données expérimentales. C’est ainsi que la stratégie est validée en conditions opérationnelles. Afin de réaliser ces tests expérimentaux, une étape de mise en place du moyen d’essais a été réalisée. Notamment, les outils de communication ont été mis au point (bus de terrains, liaisons série …). L’asservissement en position de la station a été réalisé à partir d’une identification non-paramétrique en boucle fermée du mécanisme. L’intégration de la station complète a été réalisée, permettant ainsi les tests en extérieur, sur un hexapode.

In military and civil application, satellite communications (SACTOM) are often needed on moving vehicles (drones, planes, land vehicles, vessels…) in order to transfer all kind of data (pictures, videos, internet …). These types of stations are called SATCOM On The Move (SOTM). In order insure high data rates, the antenna must be directional, which means that they direct…

Advisors/Committee Members: Brun, Xavier (thesis director).

Subjects/Keywords: Commande automatique; Commande innovante; Asservissement numérique; Commande asservie; Antenne satelite mobile; Système de communication sans fil; Système de communication par satellite; Servomécanismes; Satcom; Modèle de simulation; Automatic control; Innovative control system; Digital servoing; Controlled control; Mobile satelite antenna; Communication system; Satellite communication system; Servomechanisms; Satcom; Simulation; 629.804 072

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Broussard, E. (2018). Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2018LYSEI090

Chicago Manual of Style (16^th Edition):

Broussard, Elliot. “Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move.” 2018. Doctoral Dissertation, Lyon. Accessed January 21, 2021. http://www.theses.fr/2018LYSEI090.

MLA Handbook (7^th Edition):

Broussard, Elliot. “Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move.” 2018. Web. 21 Jan 2021.

Vancouver:

Broussard E. Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move. [Internet] [Doctoral dissertation]. Lyon; 2018. [cited 2021 Jan 21]. Available from: http://www.theses.fr/2018LYSEI090.

Council of Science Editors:

Broussard E. Commande innovante d’une nouvelle génération d’antenne satellite mobile : New control algorithm for Satcom on the move. [Doctoral Dissertation]. Lyon; 2018. Available from: http://www.theses.fr/2018LYSEI090

12. Battikh, Arij. Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band.

Degree: Docteur es, Electronique des Hautes Fréquences, Photonique et Systèmes, 2020, Limoges

URL: http://www.theses.fr/2020LIMO0012

►

Cette thèse réexamine l’architecture des récepteurs de station sol de télécommunications par satellites (SATCOM) en mettant en oeuvre des briques technologiques innovantes de sous-échantillonnage /… (more)

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Cette thèse réexamine l’architecture des récepteurs de station sol de télécommunications par satellites (SATCOM) en mettant en oeuvre des briques technologiques innovantes de sous-échantillonnage / numérisation RF et de duplexeur de polarisation numérique (DOMT). Un démonstrateur fonctionnant en Bande X a été étudié et conçu à partir de ces briques technologiques. Le sous-échantillonnage des signaux RF est réalisé grâce à la technologie Track and Hold Amplifier (THA) qui permet d’échantillonner des signaux dont la bande passante couvre plusieurs GHz (DC-13 GHz dans le cadre de ce travail). Une étude expérimentale a été menée pour comparer les performances en termes de dynamiques, de taux de distorsion harmonique et de facteur de bruit d’un THA avec celles d’un mélangeur équivalent. La numérisation du signal FI image basse fréquence du signal RF sous-échantillonné est ensuite assurée par un Convertisseur Analogique Numérique (CAN) haute vitesse. Le DOMT réalisé comporte une jonction tourniquet purement analogique qui permet de canaliser les signaux polarisés reçus. L’unité de traitement numérique du signal du DOMT permet de recombiner les signaux polarisés orthogonalement à partir d’un calibrage numérique. Le fonctionnement en bande X de ce concept innovant de tête de réception numérique est démontré, d’une part, théoriquement à partir d’un modèle mathématique et expérimentalement d’autre part, à travers les caractérisations du démonstrateur conçu. Les résultats obtenus en simulation comme en mesure permettent de valider le concept et d’obtenir un couplage de polarisation croisée de l’ordre de 40dB en bande X.

This thesis reconsiders the architecture of ground station receivers of satellite communications (SATCOM) thanks to the implementation of innovative technological components: theRF sub-sampling/digitization and the digital polarization duplexer (DOMT). A demonstrator operating at X-Band has been studied and designed from these technologies. The sub-sampling of the RF signals is performed using Track and Hold Amplifier (THA) technology which allows sampling signals whose bandwidth covers several GHz (DC-13 GHz in the context of this work). An experimental study has been conducted to compare the performances of a THA with those of an equivalent mixer in terms of dynamics, harmonic distortions and noise factor. The digitization of the IF signals, low frequency image of the sub-sampled RF signal, is then ensured by a high-speed Digital Analog Converter (ADC). The realized DOMT is based on the use of a purely analog turnstile junction which separates the polarized received signals. The DOMT digital signal processing unit allows recombination of orthogonally polarized signals from a digital calibration. The proper functioning of this innovative digital RF front-end concept is demonstrated at X band, theoretically from a mathematical model on the one hand and experimentally on the other hand, thanks to the characterizations of the designed demonstrator. The obtained results in both simulation and measurement…

Advisors/Committee Members: Barataud, Denis (thesis director), Neveux, Guillaume (thesis director), Chambon, Cédric (thesis director).

Subjects/Keywords: SATCOM; Radio Fréquence (RF); Radio-logicielle; Duplexeur de polarisation numérique (DOMT); Sous-échantillonnage RF; Track and Hold Amplifier (THA); Convertisseur Analogique Numérique; SNR; SFDR; THD; SATCOM; Radio Frequency (RF); Software Radio; Digital Polarization Duplexer (DOMT); RF subsampling; Track and Hold Amplifier (THA); Digital Analog Converter; SNR; SFDR; THD; 621.382 5

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Battikh, A. (2020). Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band. (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2020LIMO0012

Chicago Manual of Style (16^th Edition):

Battikh, Arij. “Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band.” 2020. Doctoral Dissertation, Limoges. Accessed January 21, 2021. http://www.theses.fr/2020LIMO0012.

MLA Handbook (7^th Edition):

Battikh, Arij. “Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band.” 2020. Web. 21 Jan 2021.

Vancouver:

Battikh A. Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band. [Internet] [Doctoral dissertation]. Limoges; 2020. [cited 2021 Jan 21]. Available from: http://www.theses.fr/2020LIMO0012.

Council of Science Editors:

Battikh A. Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X : Development of an innovative digital RF front-end for the reception on ground of satellite in the X-Band. [Doctoral Dissertation]. Limoges; 2020. Available from: http://www.theses.fr/2020LIMO0012

University of Waterloo

13. Rasti Boroujeni, Soroush. High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/16470

► The ever-increasing demand for wireless broadband connectivity requires infrastructure capable of supporting data transfer rates at multi-Gbps. To accommodate such heavy traffic, the channel capacity… (more)

▼ The ever-increasing demand for wireless broadband connectivity requires infrastructure capable of supporting data transfer rates at multi-Gbps. To accommodate such heavy traffic, the channel capacity for the given spectrum must be utilized as efficiently as possible. Wideband millimeter-wave phased-array systems can enhance the capacity of the channel by providing multiple steerable directional beams. However the cost, complexity, and high power consumption of phased-array systems are key barriers to the commercialization of such technology. Silicon-based beam-former chips and scalable phased-array technology offer promising solutions to lower the cost of phased-array systems. However, the implementation of low-power phased-array architectures is still a challenge. Millimeter-wave power generation in silicon beam-formers suffers from low efficiency. The stringent linearity requirements for multi-beam wideband arrays further limits the achievable efficiency. In scalable phased-arrays, each module consists of an antenna sub-array and a beam-former chip that feeds the antenna elements. To improve efficiency, a design methodology that considers the beam-former chip and the antenna array as one entity is necessary. In this thesis, power-efficient solutions for a millimeter-wave phased-array transmitter are studied and different high-efficiency power amplifier structures for broadband applications are proposed. Initially, the design of a novel 27-30 GHz RF front-end consisting of a variable gain amplifier, a 360 degree phase shifter, and a two-stage linear power amplifier with output power of 12 dBm is described. It is fabricated using 0.13 μ m SiGe technology. This chip serves as the RF core of a beam-former chip with eight outputs for feeding a 2 × 2 dual-feed sub-array. Such sub-arrays are used as part of large phased-arrays for SATCOM infrastructure. Measurement results show 26.7 % total efficiency for the designed chip. The chip achieves the highest efficiency among Ka-band phased-array transmitters reported in the literature. In addition, original transformer-based output matching structures are proposed for harmonic-tuned power amplifiers. Harmonic-tuned power amplifiers have high peak-efficiency but their complicated output matching structure can limit their use in beam-former RF front-ends. The proposed output matching structures have the layout footprint of a transformer, making their use in beam-former chips feasible. A 26-38 GHz power amplifier based on a non-inverting 1:1 transformer is fabricated. A measured efficiency of more than 27 % is achieved across the band with an output power of 12 dBm. Furthermore, two continuous class F^-1 power amplifiers using 1:1 inverting transformers are described. Simulation results show a peak-efficiency of 35 % and output power of 12 dBm from 24 to 30 GHz. A common-base power amplifier with inverting transformer output matching is also demonstrated. This amplifier achieves a peak-efficiency of 42 % and peak output power of 16 dBm. Finally, a…

Subjects/Keywords: 5G mobile communication; beam-former chip; GEO; millimeter wave phased-array; phase shifter; passive beam-forming; satellite communication; transmitter; variable attenuator; continuous-mode; RF Tuner; Reconfigurable Output Matching Network; transformer; power amplifier; satellite communication; non-inverting transformer; inverting transformer; antenna; active-antenna; SATCOM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rasti Boroujeni, S. (2020). High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rasti Boroujeni, Soroush. “High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters.” 2020. Thesis, University of Waterloo. Accessed January 21, 2021. http://hdl.handle.net/10012/16470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rasti Boroujeni, Soroush. “High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters.” 2020. Web. 21 Jan 2021.

Vancouver:

Rasti Boroujeni S. High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10012/16470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rasti Boroujeni S. High-Efficiency Millimeter-Wave Front-Ends for Large Phased-Array Transmitters. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

14. Hellberg, Joakim. Comparing Control Strategies fora Satcom on the Move Antenna.

Degree: Industrial Engineering and Management (ITM), 2020, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279331

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Satellite communication is a widely known method for communicating with remote or disaster-strickenplaces. Sometimes, thecommunication can be a matter of life and death,and it… (more)

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Satellite communication is a widely known method for communicating with remote or disaster-strickenplaces. Sometimes, thecommunication can be a matter of life and death,and it is thus vital that it works well. For two-way communication (such as internet) it is necessary for the antenna on Earth to point towards the satellite with a pointing error not larger than a few tenths of a degree. For example, regulations decided by the authorities in the U.S. forbid pointing errors larger than 0.5°. In some cases the antenna on Earth has to be moving while satellite communication is maintained. Such cases can be when the antenna is mounted to a vehicle, and the antenna thus has to compensate for the vehicle’s movement in order to point at the satellite. This application of satellite communication is called Satcom on the Move (SOTM). By constructing a Simulink model of an entire SOTM-system, including vehicle dynamics, satellite position, signal behavior, sensors, and actuators, different control strategies can be compared. This thesis compares the performance of an H2- and an LQG-controller for a static initial acquisition case, and a dynamic inertial stabilization case. The static initial acquisition case is performed with a search algorithm (SpiralSearch) aiming to find the satellite signalin the shortest possible time for a given initial pointing error. The dynamic inertial stabilization case is performed by allowing the simulated vehicle to drive in a slalom pattern and over uneven grounds. The controllers are designed based on modern control theory.The conclusion of this thesis is that the H2-controller performs slightly better in the static testcase,whereastheLQG-controller performs slightly better in the dynamic test cases. However, the results are greatly influenced by the tuning of the controllers, meaning that the comparison is not necessarily true for the controllers rather than the tuning parameters.

Satellitkommunikation är en allmänt känd metod för att kommunicera med avlägsna eller katastrofdrabbade platser. Ibland kan kommunikationen vara en fråga om liv och död, och det är därför viktigt att den fungerar bra. För tvåvägskommunikation (som internet) är det nödvändigt att antennen på jorden pekar mot satelliten med ett pekfel som inte är större än några tiondels grader. Exempelvis finns det lagar i USA som förbjuder pekfel större än 0,5°. I vissa fall måste antennen på jorden röra sig medan satellitkommunikation upprätthålls. Sådana fall kan vara när antennen är monterad på ett fordon och antennen således måste kompensera för fordonets rörelse för att peka mot satelliten. Denna applikation av satellitkommunikation kallas Satcom on the Move(SOTM). Genom att konstruera en simulinkmodell av ett fullständigt SOTM-system, inklusive fordonsdynamik, satellitposition, signalbeteende, sensorer och ställdon, kan olika reglerstrategier jämföras. Denna avhandling jämför en H2 - och en LQG-regulator för ett statiskt fall, samt ett dynamiskt fall. Det statiska fallet utförs med en sökalgoritm…

Subjects/Keywords: Mechatronics; Control; Satcom on-the-Move; SOTM; H2; Optimal Control; Linear QuadraticGaussian (LQG); LQR; Spiral Search; Estimator; Mekatronik; Reglerteknik; Satcomon-the-Move; SOTM; H2; OptimalReglering; LQG; LQR; Spiralsökning; Tillståndsskattare; Engineering and Technology; Teknik och teknologier

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hellberg, J. (2020). Comparing Control Strategies fora Satcom on the Move Antenna. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279331

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hellberg, Joakim. “Comparing Control Strategies fora Satcom on the Move Antenna.” 2020. Thesis, KTH. Accessed January 21, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279331.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hellberg, Joakim. “Comparing Control Strategies fora Satcom on the Move Antenna.” 2020. Web. 21 Jan 2021.

Vancouver:

Hellberg J. Comparing Control Strategies fora Satcom on the Move Antenna. [Internet] [Thesis]. KTH; 2020. [cited 2021 Jan 21]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279331.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hellberg J. Comparing Control Strategies fora Satcom on the Move Antenna. [Thesis]. KTH; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279331

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Bäckström, Hampus. Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications.

Degree: Electromagnetic Engineering, 2018, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231844

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In this master thesis, compact antenna design aimed towards naval applicationshave been designed, analyzed and evaluated. There is a recentinterest in the development of… (more)

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In this master thesis, compact antenna design aimed towards naval applicationshave been designed, analyzed and evaluated. There is a recentinterest in the development of compact antennas to be used for smallersubmarine models, and with a smaller hull on a submarine, communicationand antenna systems must be adapted and minimized, which limitsantenna design. With two limiting cylindrical volumes with maximumallowed dimensions r = 10 cm, h = 50 cm and r = 5 cm, h = 90 cm,the antennas would operate on the upper to lower V/UHF band, radiatehemispherically and have a high RHCP purity. It was found that the mostappropriate antenna structure for both volumes was QHA design. Afterthe design and analysis process was completed, it was concluded that theshorter antenna design could meet all requirements set while the longerantenna design did not meet all requirements but could still establish agood communication link on the higher frequencies. Antenna prototypesbased on the produced design were constructed and measured and, despiteminor deviations, veried that the results obtained from this thesis werereliable.

I denna mastersuppsatsen har kompakta antenner riktade mot marinaapplikationer designats, analyserats och utvarderats. Det nns ett intressefor utvecklingen av kompakta antenner som ska anvandas for mindreubatsmodeller och med ett mindre skrov pa en ubat maste kommunikationsochantennsystemen anpassas och minimeras darefter, vilket begransarantenndesignen. Med tva begransande cylindriska volymer med maximalttillatna dimensioner r = 10 cm, h = 50 cm samt r = 5 cm,h = 90 cm, skulle antennerna verka pa det ovre till lagre V/UHF-bandet,strala hemisfariskt och ha en hog RHCP-renhet. Det konstaterades attden lampligaste antennstrukturen for bada volymen var QHA-design. Efteratt design- och analysprocessen slutforts drogs slutsatsen att den kortareantenndesignen kunde uppfylla alla krav som stalldes medan den langreantenndesignen inte uppfyllde alla krav men fortfarande kunde upprattaen bra kommunikationslank pa de hogre frekvenserna. Antennprototyperbaserade pa de framtagna designerna konstruerades och mattes och, trotsmindre avvikelser, verierade att de erhallna resultaten fran denna avhandlingvar tillforlitliga.

Subjects/Keywords: Antenna design; Antenna simulations; QHA; Submarine communication; SatCom; MUOS; Legacy; Antenndesign; Antennsimulering; QHA; Ubatskommunikation; Satellitkommunikation; MUOS; Legacy; Engineering and Technology; Teknik och teknologier

…Hand Circular Polarization SatCom - Satellite Communication SGA - Standard Gain Antenna SP… …corresponding to SatCom system Legacy’s downlink) – f = [292-320] MHz (… …corresponding to SatCom system Legacy’s uplink and MUOS’s uplink) – f = [360-380] MHz… …x28;corresponding to SatCom system MUOS’s downlink) • Hemispherical coverage over the… …established. One of the major advantages of satellite communication SatCom is that it enables point…

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Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bäckström, H. (2018). Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bäckström, Hampus. “Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications.” 2018. Thesis, KTH. Accessed January 21, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bäckström, Hampus. “Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications.” 2018. Web. 21 Jan 2021.

Vancouver:

Bäckström H. Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications. [Internet] [Thesis]. KTH; 2018. [cited 2021 Jan 21]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bäckström H. Design and Evaluation of V/UHF Satellite Communication Antennas for Naval Applications. [Thesis]. KTH; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations