Dissertations / Theses on the topic 'Wireless communication'
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Kodikara, Patabandi C. K. "Multimedia communications over 3G wireless communication systems." Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/844270/.
Full textMuhovic, Admir. "Secure Wireless Communication." Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92023.
Full textBehoven och efterfrågan av mobil och trådlös utrustning är i dagsläget allt större. Fördelarna med att använda sig av trådlös kommunikation är enkla att inse. Att kunna ha tillgång till elektroniskt lagrad information oavsett var man än befinner sig är en stor fördel. Vidare implementeras trådlös kommunikation allt mer i det vardagliga arbetet samtidigt som utrustning för denna sorts kommunikation är i ständig utveckling. I slutändan är användandet av trådlös kommunikation väldigt praktiskt samtidigt som det är effektivt. Användandet av trådlös utrustning och kommunikation medför ett risktagande då denna typ av kommunikation allmänt är osäker. Detta eftersom teknologin fortfarande är i utvecklingsfasen. De i dagsläget aktuella trådlösa protokollen är sårbara för attacker och det är dessutom enkelt att avlyssna trafiken. Felaktig installation av utrustning bidrar dessutom också till att den trådlösa kommunikationen blir sårbar. En del av den IT-utrustning som idag finns tillgänglig ute på marknaden och som alltmer används inom FMV har möjlighet att kommunicera trådlöst med omgivningen. Exempel på sådan utrustning är bärbara datorer, PDA:er, mobiltelefoner mm. Denna typ av utrustning, dvs. trådlös utrustning, skall enligt FMVs informationssäkerhetspolicy godkännas från säkerhetssynpunkt innan den får tas i bruk på FMV. Det innebär att man utför en analys av vilka risker som är förknippade med användandet av trådlös utrustning samt att man identifierar adekvata skyddsåtgärder. Till sin hjälp använder man sig av Kraven på SäkerhetsFunktioner (KSF) som består av tekniska och/eller administrativa krav. Syftet med detta examensarbete var att undersöka om det finns möjlighet att använda trådlös utrustning på FMV, dvs. att denna används på interna LAN på FMV. Med andra ord skall den trådlösa utrustningen kunna erbjuda ett skydd motsvarande högst informationssäkerhetsklassen HEMLIG/RESTRICTED (H/R). Examensarbetet innefattar en analys av vilka säkerhetsfunktioner idag finns tillgängliga ute på marknaden och utvärderar huruvida dessa säkerhetsfunktioner uppfyller kraven givna i Kraven på SäkerhetsFunktioner (KSF). Resultatet är ett förslag på de bästa säkerhetsmekanismerna inom restriktionerna av KSF och den tillgängliga utrustningen. Examensarbetet föreslår en teknisk lösning med lämpliga säkerhetsmekanismer. Dess för- och nackdelar har analyserats. Examensarbetet presenterar dessutom ett antal (administrativa) säkerhets policies som hanterar säkerhetsaspekter som inte omhändertas av KSF.
Cottingham, David Naveen. "Vehicular wireless communication." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611258.
Full textDagne, Carl, Johan Bengtsson, and Ingemar Lindgren. "Microwave Wireless Communication System." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-232.
Full textThe purpose of the project was to develop the hardware to a microwave wireless system working
at the frequency 2.45 GHz. The functionality of the system should also be easy to understand
since the system is to be used in an educational purpose. Much time has been spent impedance
matching components, a task that proved to be harder than we expected. Other work that has been
is layout of all parts, filter construction and the writing of an easy to understand thesis. After the
parts had been completed, they were tested in a network analyzer and/or spectrum analyzer.
Successful full system test has been done up to 400 meters, the length the system is to be used
for.
Herbert, Steven John. "Wireless communication in vehicles." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/280675.
Full textJiang, Junyi. "Optical wireless communication systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387239/.
Full textDu, Hao. "Optical wireless MIMO communication." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/70945/.
Full textКovalenko, Viktoriya, and Oksana Tykhenko. "Wireless communication safety analysis." Thesis, Proceedings the Seventh World Congress «Aviation in the XXI-st Century», September 19 – 21, 2016. – P. 5.4.46 – 5.4.48, 2016. http://er.nau.edu.ua/handle/NAU/29355.
Full textGao, Zihao. "Wireless Powered Communication Networks." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17169.
Full textYamashita, Shota. "Coexistence of Wireless Communication and Non-communication Systems." Kyoto University, 2018. http://hdl.handle.net/2433/232420.
Full textKrause, Wolfram O. "Wireless communication networks : structure and dynamics of wireless multi-hop ad hoc communication networks /." Lichtenberg (Odenw.) : Harland media, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015507583&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textSchuster, Ulrich G. "Wireless communication over wideband channels /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17565.
Full textLee, Kah Ping. "Turbo equalization in wireless communication." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/5844.
Full textThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 11, 2006) Includes bibliographical references.
Pakravan, Mohammad Reza. "Indoor infrared wireless communication channels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/NQ57061.pdf.
Full textRay, Adam A. Roppel Thaddeus A. "Cooperative robotics using wireless communication." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Thesis/RAY_ADAM_44.pdf.
Full textLu, Yang. "UWB antennas for wireless communication." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569654.
Full textLiu, Luyan. "Wireless Communication in Smart Housing." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-37631.
Full textBourget, Marc A. (Marc Anthony) 1979. "Expanding the wireless communication paradigm." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87185.
Full text"June 2002."
Includes bibliographical references (leaves 44-45).
by Marc A. Bourget.
M.Eng.
Music, Craig 1978. "Expanding the wireless communication paradigm." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8077.
Full textDing, Yuan. "Directional modulation secured wireless communication." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676283.
Full textSchuster, Ulrich G. "Wireless communication over wideband channels." Konstanz Hartung-Gorre, 2008. http://d-nb.info/993286984/04.
Full textAlhartomi, Mohammed. "Collaborative optical wireless communication systems." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/13153/.
Full textToni, Laura <1982>. "Adaptive wireless multimedia communication systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2117/1/Laura_Toni_tesi.pdf.
Full textToni, Laura <1982>. "Adaptive wireless multimedia communication systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2117/.
Full textCavallari, Riccardo <1986>. "Human-Centric Wireless Communication Networks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7444/1/tesi.pdf.
Full textCavallari, Riccardo <1986>. "Human-Centric Wireless Communication Networks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7444/.
Full textZHANG, LINCHAO. "Reliable Communication in Wireless Networks." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2537290.
Full textBarros, João. "Reachback communication in wireless sensor networks." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973065753.
Full textAcharya, Om Nath, and Sabin Upadhyaya. "Space Time Coding For Wireless Communication." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19424.
Full textNordberg, Jörgen. "Signal enhancement in wireless communication systems /." Ronneby : Department of Telecommunications and Signal Processing, Blekinge Institute of Technology, 2002. http://www.bth.se/fou.
Full textRen, Kui. "Communication security in wireless sensor networks." Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-040607-174308/.
Full textYu, Qiang. "Frequency synchronization techniques in wireless communication." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54596/.
Full textYuen, Hector. "An ad-hoc wireless communication system." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37398.
Full textIncludes bibliographical references (p. 77-79).
This thesis studies the challenges of providing load balancing and fault-tolerant external links between ad-hoc multicast mesh networks. The work is the gateway component of a research platform called FluidVoice, a wireless audio communication system. This system consists of nodes forming a broadcast mesh based on 802.11. Some of these nodes called Stargates have the capability to communicate to the external world. The problem is that these gateways can fail or lose capacity unexpectedly. In this work we explore the ways to provide communications to the external world under unexpected gateway node failures, and variance of load. We propose and evaluate a distributed algorithm designed to form this robust and balanced interconnection. The algorithm is designed with robustness in mind, and takes into account failures in the outbound links as well as between the gateways, and it is focused to support real-time applications running over it. In this thesis we show that by adopting this algorithm, we can provide a reliable connection to the end-user even as gateways presence or capacity varies. The prototype version has about 20ms of additional transmission time in average, with an overhead of about 5% to 35% depending on the packet size, and a recovery time of 1 to 3 seconds. The redundant traffic generated in intermediate steps of the optimization problem can grow up proportionally to the number of participating gateway nodes, and reduces quickly to only the required amount of traffic.
by Hector Yuen.
S.M.
Min, Rex K. (Rex Kee) 1976. "Energy and quality scalable wireless communication." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/28272.
Full textIncludes bibliographical references (p. 165-171).
Nodes for emerging, high-density wireless networks will face the dual challenges of continuous, multi-year operation under diverse and challenging operating conditions. The wireless communication subsystem, a substantial consumer of energy, must therefore be designed with unprecedented energy efficiency. To meet this challenge, inefficiencies once overlooked must be addressed, and the system must be designed for energy scalability, the use of graceful energy vs. quality trade-offs in response to continuous variations in operational conditions. Using a comprehensive model framework that unifies cross-disciplinary models for energy consumption and communication performance, this work explores multi-dimensional trade-offs of energy and quality for wireless communication at all levels of the system hierarchy. The circuit-level "knob" of dynamic voltage scaling is implemented on a commercial microprocessor and integrated into a power aware, prototype microsensor node. Power aware abstractions encourage collaboration between the hardware, which fundamentally dissipates the energy, and software, which controls how the hardware behaves. Accurate models of hardware energy consumption reveal inefficiencies of routing techniques such as multihop, and the models are fused with information-theoretic limits on code performance to bound the energy scalability of the hardware platform. An application-specific protocol for microsensor networks is evaluated with a new, interactive Java simulation tool created expressly for energy-conscious, high density wireless networks. Close collaboration between software and hardware layers, and across the research disciplines that compose wireless communication itself, are crucial enablers for energy-efficient wireless communication.
by Rex Kee Min.
Ph.D.
Johnson, Brent, Colin Madrid, Kevin Yiin, Hanwen Wang, Chengxi Li, and Xizhi Tan. "3D Printed Antennas for Wireless Communication." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596460.
Full textThis paper describes the details of design and critical analysis of the process of 3D printing antennas for wireless communications applications. The subjective testing methods utilized were chosen specifically based on project scope and researcher capability. Our results indicate that more work is necessary in this field but that the basic idea is feasible.
Lacerda, Neto Raul Liberato de. "Exploiting the wireless channel for communication." Nice, 2008. http://www.theses.fr/2008NICE4049.
Full textLe récent développement des communications mobiles a fait des réseaux sans fil un des secteurs technologiques les plus prometteurs. Stimulé par les avancées en traitement de l'information, le haut débit est récemment devenu le centre de la recherche dans le domaine des communications. La croissance des flux Internet et l'introduction d'une multitude d'applications ont abouti à une nouvelle ère des communications dans lesquelles les réseaux sans fil jouent un rôle très important. Cependant, l'environnement sans fil offre toujours quelques défis qui doivent être adressés avant d'atteindre les pré-requis nécessaires pour les futurs réseaux sans fils. En raison de la caractérisation imprécise du canal de transmission, une grande partie du potentiel du canal sans fil est gaspillé. En outre, les schémas de communications multi-utilisateurs actuels n'exploitent pas convenablement les différents degrés de liberté (espace et bande) du canal. Le but de cette thèse est de traiter précisément ces deux points. La première partie de cette thèse est consacrée à l'utilisation des outils de théorie des probabilités bayésiens qui permettent de générer des modèles basés seulement sur la connaissance partielle de l'environnement. A partir du principe de maximisation d'entropie, nous présentons une approche qui permet d'inférer sur les caractéristiques des canaux en choisissant les distributions de probabilité qui maximisent l'entropie sous des contraintes qui représentent l'état de la connaissance de l'environnement. Cette technique est à la base des procédés d'inférences et a connu un large succès dans différentes disciplines. Des modèles pour deux différents types d'environnement sont analysés et proposés: canaux à large bande et canaux multi-antennes (MIMO). Dans la deuxième partie, le problème d'accès multiple pour les systèmes ultra large bande (UWB) est étudié. Malgré la grande quantité de travaux effectués ces dernières années sur la technologie d'UWB, aucune technique d'accès multiple n'exploite actuellement la dispersion élevée des canaux d'UWB, ce qui engendre une faible efficacité spectrale. Un schéma innovant qui exploite les canaux des utilisateurs s'intitulant "Channel Division Multiple Access" (ChDMA) est proposé. Ce schéma fournit une solution très simple tout en obtenant une efficacité spectrale élevée
Sepasian, Mojtaba. "Multibiometric security in wireless communication systems." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/5081.
Full textFan, Ho Yin. "MIMO detection schemes for wireless communication /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20FAN.
Full textIncludes bibliographical references (leaves 64-66). Also available in electronic version. Access restricted to campus users.
Kennedy, B. Scott. "Reconfigurable multi-node wireless communication testbed." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004832.
Full textLi, Ziyi. "Wireless-Powered Communication with Energy Accumulation." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16123.
Full textMorshed, M. (Munim). "Wireless backhaul in future cellular communication." Master's thesis, University of Oulu, 2018. http://jultika.oulu.fi/Record/nbnfioulu-201809292841.
Full textAbbas, Waqas Bin. "Energy Efficient Communication in Wireless Networks." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424869.
Full textQuesta tesi indaga la comunicazione ad alta efficienza energetica nelle reti wireless. Il lavoro considera l'efficienza energetica sia da un dispositivo ed un prospettiva di rete. In primo luogo, si indaga l'efficienza energetica (EE) di un ricevitore dotato di grandi schiere di antenne. In un'architettura ricevitore, operando sia a onde millimetriche (mmWave) oa microonde (massiccia Multiple Input Multiple Output (MIMO)), l'uso di una alta risoluzione convertitore analogico-digitale (ADC) è tradizionalmente considerata come un collo di bottiglia principale ottenere un design ad alta efficienza energetica. Per risolvere questo problema, a differenza di precedenti lavori, abbiamo confrontato le prestazioni dei analogiche, ibride e beamforming digitale (ABF, HBF e DBF) architetture ricevitore based con ADC a bassa risoluzione, e mostrano che, quando il consumo di energia di tutti i componenti del ricevitore si tiene risultati considerazione DBF in una migliore efficienza spettrale, potenza ed energia rispetto ABF e HBF nella maggior parte degli scenari sia per piano di controllo e comunicazione dei dati aereo. I risultati mostrano anche che sulla base del modello di consumo energetico ADC c'è un numero ottimale di bit ADC che si traduce in un EE massimo (definito come Capacità / potenza totale assorbita). Per ridurre ulteriormente il consumo di energia di DBF, una nuova architettura di risoluzione ADC variabile viene proposto, che motiva l'uso di ADC risoluzione variabili anziché le convenzionali ADC risoluzione fissa. Per affrontare il problema del consumo energetico legato alla ricerca di cellule direzionale associato ad un grande sistema di antenne, si propone di sfruttare la disponibilità di informazioni di contesto per ridurre la Ritardo di ricerca associato con ABF e proporre un'architettura di ricevitore rete basata variatori di fase a bassa potenza che si confronta e seleziona il miglior trave in hardware analogico e richiede solo una singola catena RF. Si propone inoltre una struttura piana controllo basata banda sottoportante superiore per ridurre il consumo energetico del processo di rilevamento cellule direzionale. In secondo luogo, si studia la comunicazione ad alta efficienza energetica in una rete inondazioni multi-hop. In particolare, studiamo e analizziamo come in una rete multi-hop di un sistema ibrido automatizzato richiesta di ripetizione (HARQ) sulla base di codici a fontana in grado di ridurre la probabilità di guasto a destinazione. L'analisi viene eseguita per entrambi gli scenari di allagamento senza restrizioni e ristrette, e risultati verificare che al di sotto di un certo errore di collegamento minima probabilità inondazioni limitato esegue simile a inondazioni senza restrizioni, ma con un minor numero di trasmissioni rispetto alle inondazioni senza restrizioni. Tale riduzione del numero di trasmissioni è direttamente correlata ad un miglioramento dell'efficienza energetica di una rete complessiva. Inoltre, abbiamo anche proposto due pratiche politiche inondazioni restrizioni; 1) restrizione predeterminato, che svolge simili a inondazioni ristretta, e 2) restrizione adattivo, che adatta il suo numero di trasmissioni in base alla probabilità di guasto collegamento ed esegue simile a inondazioni senza restrizioni. Inoltre, abbiamo anche studiare le prestazioni di una rete in presenza di nodi che possono aiutare decodificare e generare pacchetti di ridondanza supplementare della rete. I risultati mostrano che l'inserimento di nodi contribuendo può ridurre ulteriormente il numero di trasmissioni rispetto al caso in cui solo la sorgente sta trasmettendo.
Wang, Shendi. "Efficient transmission design for machine type communications in future wireless communication systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23647.
Full textSohaib, Sarmad. "Energy efficient cooperative wireless communications." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/energy-efficient-cooperative-wireless-communications(a852e1e2-04ad-4311-8004-53babe529e1b).html.
Full textSun, Zhi. "Reliable and efficient communication in wireless underground sensor networks." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41150.
Full textXia, Bin, and 夏斌. "Enhanced techniques for broadband wireless communications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29144231.
Full textYin, Hujun. "Cross layer design and optimization of wireless networks /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5904.
Full textZhang, Mingliu. "Wireless communication for sparse and rural areas." Diss., Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/zhang/ZhangM0807.pdf.
Full textLiu, Lingjia. "On delay-sensitive communication over wireless systems." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2725.
Full textAli, Omar Ahmed. "Delay-sensitive communication over wireless multihop channels." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2715.
Full text