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Dissertations / Theses on the topic 'Decentralized wireless communications'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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1

Ge, Feng. "Software Radio-Based Decentralized Dynamic Spectrum Access Networks: A Prototype Design and Enabling Technologies." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29981.

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Dynamic spectrum access (DSA) wireless networks focus on using RF spectrum more efficiently and dynamically. Significant progress has been made during the past few years. For example, many measurements of current spectrum utilization are available. Theoretical analyses and computational simulations of DSA networks also abound. In sharp contrast, few network systems, particularly those with a decentralized structure, have been built even at a small scale to investigate the performance, behavior, and dynamics of DSA networks under different scenarios. This dissertation provides the theory, desig
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2

Perlaza, Samir. "Le Partage du Spectre dans les Réseaux Décentralisés Auto-Configurables : Une approche par la Théorie des Jeux." Phd thesis, Ecole nationale supérieure des telecommunications - ENST, 2011. http://tel.archives-ouvertes.fr/tel-00667124.

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Les travaux de cette thèse s'inscrivent tous dans la thématique " traitement du signal pour les réseaux de communications distribués ". Le réseau est dit distribué au sens de la décision. Dans ce cadre, le problème générique et important que nous avons approfondi est le suivant. Comment un terminal, qui a accès à plusieurs canaux de communications, doit-il répartir (de manière autonome) sa puissance d'émission entre ses canaux et l'adapter dans le temps en fonction de la variabilité des conditions de communications ? C'est le problème de l'allocation de ressources adaptative et distribuée. Nou
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3

Zhang, Lu. "Decentralized cooperative communication for wireless relaying networks." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 202 p, 2009. http://proquest.umi.com/pqdweb?did=1885757461&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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4

Topham, Debra Ann. "Decentralised wireless data dissemination for vehicle-to-vehicle communications." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3335/.

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This thesis is concerned with inter-vehicle communications supporting the deployment of future safety-related applications. Through use case analysis of the specific communica- tions requirements of safety related and traffic efficiency applications, a data dissemination framework is proposed that is able to meet the various message delivery requirements. More specifically, this thesis focuses on the subset of the proposed framework, which provides geocasting, i.e. addressing a geographical area on the road network, and local zone connectivity, providing neighbour awareness, for safety related
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5

Yackoski, Justin. "High performance medium access control protocols for decentralized wireless networks using local coordination." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 156 p, 2009. http://proquest.umi.com/pqdweb?did=1833647411&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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6

Asgharimoghaddam, H. (Hossein). "Decentralized coordinated transceiver design with large antenna arrays." Master's thesis, University of Oulu, 2013. http://urn.fi/URN:NBN:fi:oulu-201310161794.

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The benefits of MIMO technology have made it a solution for the present and future wireless networking demands. Increasing the number of antennas is an intuitive approach for boosting the network capacity; however, processing load and implementation limitations put a practical bound on this goal. Recently a solution known as massive MIMO has shown that a very large antenna array at the base station can simplify the processing, in a way that even matched filter (MF) can be used for detection purpose. The ultimate performance of massive MIMO can be achieved only under some optimistic assumption
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7

Gottipati, Naga Sravani. "Design and Implementation of Communication Platform for Autonomous Decentralized Systems." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc33156/.

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This thesis deals with the decentralized autonomous system, in which individual nodes acting like peers, communicate and participate in collaborative tasks and decision making processes. An experimental test-bed is created using four Garcia robots. The robots act like peers and interact with each other using user datagram protocol (UDP) messages. Each robot continuously monitors for messages coming from other robots and respond accordingly. Each robot broadcasts its location to all the other robots within its vicinity. Robots do not have built-in global positioning system (GPS). So, an indoor
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8

Tunaru, Iulia. "Physical layer secret key generation for decentralized wireless networks." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S081/document.

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Dans cette thèse on s’est intéressé aux méthodes de génération de clés secrètes symétriques en utilisant la couche physique ultra large bande impulsionnelle (IR-UWB). Les travaux ont été réalisés selon trois axes, les deux premiers concernant la communication point-à-point et le dernier, les communications coopératives. Tout d’abord, la quantification des signaux typiques IR-UWB (soit directement échantillonnés, soit estimés) a été investiguée, principalement du point de vue du compromis entre la robustesse (ou réciprocité) des séquences binaires obtenues et leur caractère aléatoire. Différent
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9

Bazco, Nogueras Antonio. "Fundamental Limits and Algorithms in Decentralized and Cooperative Wireless Networks." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS172.

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La coopération en réseau est connue pour apporter des gains multiplicatifs sous certaines hypothèses idéales. Cependant, les réseaux sans-fil actuels font face à de nombreuses contraintes, telles que des contraintes de délai serrées ou des liaisons de retour à débit limité. L'impact sur la performance de la transgression des hypothèses idéales a suscité un grand intérêt dans le milieu de la recherche. Néanmoins, l'accent a été mis sur des situations dans lesquelles l'information imparfaite est partagée par tous les nœuds, ce qui n'est pas réalisable dans de nombreux scénarios. Cette thèse vise
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10

Bai, Chumeng. "Evaluation and Improvement of Decentralized Congestion Control for Multiplatooning Application." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232849.

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Platooning has the potential to be a breakthrough in increasing road capacity and reducing fuel consumption, as it allows a chain of vehicles to closely follow each other on the road. When the number of vehicles increases, platoons will follow one another in what is referred to as multiplatooning. Many Cooperative Intelligent Transportation Systems (C-ITS) applications rely on periodically exchanged beacons among vehicles to improve traffic safety. However, as the number of connected vehicles increases, the network may become congested due to periodically exchanged beacons. Therefore, without
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11

Pham, Tran Anh Quang. "Algorithms and optimization for quality of experience aware routing in wireless networks : from centralized to decentralized solutions." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S002/document.

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Les WMNs comportent des nœuds qui sont capables de recevoir et de transmettre des données vers de multiples destinations dans le réseau. De ce fait, les WMNs sont capables de s'auto-organiser et auto-configurer dynamiquement [5]. Chaque nœud crée et maintient la connectivité avec ses voisins. La disponibilité du mode ad-hoc basée sur la norme IEEE 802.11 permet une mise en œuvre de WMNs à faible coût. Les WMNs présentent cependant deux inconvénients majeurs liés aux interférences d'une part et à la scalabilité d'autre part [6]. (D1) Le problème des interférences (D2) Le problème de scalabilité
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12

Dalce, Rejane. "Méthodes de localisation par le signal de communication dans les réseaux de capteurs sans fil en intérieur." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0020/document.

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Depuis quelques années, la thématique de la localisation a connu un regain d’intérêt,motivé en grande partie par le développement des réseaux de capteurs sans fil. Lespropositions ayant pour objectif d’apporter une réponse à cette problématique peuvent êtreclassées en deux catégories : les méthodes range-based, retenues pour cette thèse, dont lacaractéristique est de se fonder sur des mesures en temps réel du signal pour générer uneestimation relativement fiable de la distance, et les solutions range-free, économes enressources car se limitant à l’exploitation d’hypothèses concernant la connec
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13

Lin, Yunfeng. "Decentralized Coding in Unreliable Communication Networks." Thesis, 2010. http://hdl.handle.net/1807/24816.

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Many modern communication networks suffer significantly from the unreliable characteristic of their nodes and links. To deal with failures, traditionally, centralized erasure codes have been extensively used to improve reliability by introducing data redundancy. In this thesis, we address several issues in implementing erasure codes in a decentralized way such that coding operations are spread to multiple nodes. Our solutions are based on fountain codes and randomized network coding, because of their capability of being amenable to decentralized implementation originated from their simplicity
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14

Olwal, Thomas Otieno. "Decentralized dynamic power control for wireless backbone Mesh networks." Thesis, 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000499.

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D. Tech. Engineering: Electrical.<br>The remarkable evolution of wireless networks into the next generation to provide ubiquitous and seamless broadband applications has recently triggered the emergence of Wireless Mesh Networks (WMNs). The WMNs comprise stationary Wireless Mesh Routers (WMRs) forming Wireless Backbone Mesh Networks (WBMNs) and mobile Wireless Mesh Clients (WMCs) forming the WMN access. While WMCs are limited in function and radio resources, the WMRs are expected to support heavy duty applications: that is, WMRs have gateway and bridge functions to integrate WMNs with other ne
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15

Mapoka, Trust T., Haider M. AlSabbagh, Yousef A. S. Dama, et al. "A multi-service cluster-based decentralized group key management scheme for high mobility users." 2015. http://hdl.handle.net/10454/9189.

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No<br>Previous cluster based group key management schemes for wireless mobile multicast communication lack efficiency in rekeying the group key if high mobility users concurrently subscribe to multiple multicast services that co-exist in the same network. This paper proposes an efficient multi-service group key management scheme suitable for high mobility users which perform frequent handoffs while participating seamlessly in multiple multicast services. The users are expected to drop subscriptions after multiple cluster visits hence inducing huge key management overhead due to rekeying the pr
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