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Thematische Bibliographien / 802.11p / Dissertationen

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Dissertationen zum Thema „802.11p“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 26. Juli 2025

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1

Shah, Vishal, and Todor Cooklev. "THROUGHPUT AND LATENCY PERFORMANCE OF IEEE 802.11E WITH 802.11A, 802.11B, AND 802.11G PHYSICAL LAYERS." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605337.

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International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>IEEE 802.11e is an amendment of the medium-access control (MAC) layer of the standard for wireless local area networking IEEE 802.11. The goal of 802.11e is to provide 802.11 networks with Quality of Service (QoS). 802.11 has three physical layers (PHY) of practical importance: 802.11b, 802.11a, and 802.11g. 802.11a and 802.11g provide data rates between 6 and 54 Mbps, and 802.11b provides data rates of 5.5 Mbps and 11 Mbps. However these data rates are not the actual t

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Labuda, Adam. "Roaming ve WiFi sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377147.

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This work deals with roaming issues in the WiFi network. Takes options from a 802.11 standard view. Factory setting options for fast roaming from CISCO and MikroTik. It proposes to measure and test these networks.

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Pio, João Tiago Bartolomeu. "Implementation of IEEE 802.11p medium access." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/10916.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>À medida que os avanços na tecnologia vão surgindo, as comunicações sem fios são cada vez mais omnipresentes. Os progressos nesta área fizeram com que recentemente se tenha começado a explorar as comunicações entre veículos móveis, de forma a proporcionar uma viagem mais confortável e segura aos passageiros. No entanto este tipo de comunicação tem características muito específicas, distintas das já familiares redes sem fios estáticas, exigindo outros modos de funcionamento. Posto isto, há a necessidade de desenvolver um conjunto

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Lourenço, João Filipe Lopes Seabra. "Implementação em FPGA da modulação /desmodulação OFDM 802.11p." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8606.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>As comunicações veiculares começam a despertar cada vez mais interesse, muito devido às novas potencialidades oferecidas pelo desenvolvimento das comunicações sem fio. Uma das mais promissoras tecnologias dedicadas à área das comunicações veiculares é o DSRC 5.9 GHz, que associado com a recente norma IEEE 802.11p é capaz de proporcionar comunicações fiáveis e robustas entre veículos. Neste documento são mostradas as potencialidades desta tecnologia, e é apresentada a implementação de parte do sistema multiportadora OFDM, que cons

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Cruz, Cristóvão André Antunes. "Support mechanisms for deterministic MAC in IEEE 802.11p." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14471.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>Transportation systems play an extremely important role in modern society. A huge research e ort has been devoted to this eld in the past few years making them safer cleaner and more e cient, originating the so-called Intelligent Transportation Systems (ITS). While some of the enabling technologies are entering their mature phase, there are still many open problems that must be solved before such systems can be e ectively leveraged. Specifically, the medium access is regarded as being one of the most challenging issues to solve in

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Ameixieira, Carlos Eduardo Braga. "Desenvolvimento da sub-camada MAC IEEE 802.11p/1609.4." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8833.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>As comunicações veiculares visam melhorar a segurança nas estradas através da disponibilização de informação ao condutor e oferecer aos restantes ocupantes uma viagem mais agradável através de fontes de informação e entretenimento. Este cenário permite, por exemplo, o envio de mensagens de emergência, assim como o envio de um serviço disponibilizado pela internet. Esta forma de comunicação denominada Vehicular Ad-hoc NETwork (VANET), é um tipo de comunicação em que os dispositivos cooperam entre si, sem a necessidade da existência de um

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Silva, Luís Miguel Marques da. "Desenvolvimento de DSRC segundo a pré-norma IEEE 802.11p." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2193.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>Esta dissertação aborda o tema da modulação OFDM em sinais digitais, mais concretamente, a adição de uma extensão cíclica entre os símbolos OFDM. Para este trabalho, é necessária uma síntese de conhecimentos sobre o standard IEEE 802.11a e, nomeadamente, sobre a modulação OFDM bem como o DSRC, VHDL e FPGAs. A dissertação apresentada pretende dar a conhecer ao leitor noções do uso de novas tecnologias para assegurar a prevenção e melhoramento da circulação rodoviária, concretamente, uso de técnicas de modulação de sinais digitais a fim de

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Silva, João Nuno Oliveira Ramos da. "Design of a power amplifier for IEEE 802.11p applications." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/18683.

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Engenharia Eletrónica e Telecomunicações<br>Sem resumo disponível.<br>Vehicular communications in Dedicated Short Range Communications (DSRC) and Intelligent Transportation Systems (ITS) are becoming more common and used nowadays. For this type of communications to work a standard was developed as an improvement from the Wi- Fi regular standard, the IEEE 802.11p, that works in the 5.9 GHz band. In order to allow the use of such communication systems, Power Ampli ers (PAs) are one of the most important parts of the RF frontends. They have to be as linear as possible to allow high transmi

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Carvalho, Bruno Rodrigues Braz de. "Implementação da geração e detecção das sequências de treino 802.11p." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8569.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>As comunica c~oes veiculares s~ao um campo da comunica c~ao r adio ainda pouco disseminado. O tipo de comunica c~oes efectuado no ^ambito veicular, at e agora, resume-se a um conjunto muito restrito de aplica c~oes, de entre as quais se destaca o tolling. No entanto, e dada a crescente necessidade de comunica c~oes nos mais variados cen arios, o grupo de standards IEEE 802.11 desenvolveu uma norma que permitir a comunica c~ao r adio com alta largura de banda em ambientes veiculares - a norma IEEE 802.11p. Um dos maiores problemas

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Silva, Manuel José Alves Ventura da. "Co-projecto em FPGA da MAC IEEE 802.11p para comunicações veiculares." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7311.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>The advancements and dissemination of telecommunication technologies has caused them to be employed more and more in our day-to-day life. Recently, these technologies have been applied to vehicles, as a way of not only improving driving safety but also the drivers' and passengers' comfort. If vehicular communications are to become a reality, communication standards must be created in order to allow the development of compatible communication platforms, while also serving as a basys for application development. The standards IEEE W

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Nisi, Luca Gaetano. "Sperimentazione di comunicazioni veicolari ieee 802.11p per l'offloading di reti cellulari." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7925/.

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Falk, Magnus. "Snabb och säker roaming i WLAN." Thesis, Linköping University, Department of Computer and Information Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2695.

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<p>This thesis investigates how Ericsson AB should do to achieve fast and secure handover when roaming in a WLAN. It also provides a security analysis of the system that the wireless access point is part of. The reason for this is that Ericsson is selling an access point called the ABS 2200 aimed at the public hotspot market. </p><p>The premise was that they wanted a standardized way of handling the roaming issue. At the outset the 802.11F standard looked like a good alternative (in fact the only standardized alternative). Towards last stages of the work though, it was discovered that the 802.

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El, Ajaltouni Hikmat. "An Efficient QoS MAC for IEEE 802.11p Over Cognitive Multichannel Vehicular Networks." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20715.

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One of the most challenging issues facing vehicular networks lies in the design of an efficient MAC protocol due to mobile nature of nodes, delay constraints for safety applications and interference. In this thesis, I propose an efficient Multichannel QoS Cognitive MAC (MQOG). MQOG assesses the quality of channel prior to transmission employing dynamic channel allocation and negotiation algorithms to achieve significant increase in channel reliability, throughput and delay constraints while simultaneously addressing Quality of Service. The uniqueness of MQOG lies in making use of the free unli

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Skupin, Christian [Verfasser]. "Zur Steigerung der Kommunikationszuverlässigkeit von IEEE 802.11p im fahrzeugspezifischen Umfeld / Christian Skupin." Aachen : Shaker, 2014. http://d-nb.info/1049381815/34.

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Gukhool, Balkrishna Sharma. "Communication continue en mode infrastructure dans les réseaux véhiculaires utilisant IEEE 802.11P." Mémoire, Université de Sherbrooke, 2009. http://savoirs.usherbrooke.ca/handle/11143/1543.

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Les handovers sont des phénomènes inévitables dans les réseaux sans-fil mobiles. Lors du passage d'une station mobile d'un point d'accès à un autre, le handover affecte la qualité des transmissions, et ainsi, il est néfaste à la performance des réseaux sans-fil. De nombreuses techniques de réduction du délai lié au handover ont été proposées, mais la plupart ne sont pas adaptées aux attentes du nouveau type de réseau sans-fil mobile qu'est le réseau véhiculaire. Ce travail propose donc l'implémentation d'une méthode de réduction du délai encouru lors d'un handover dans les réseaux véhiculaires

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Nasrallah, Yamen. "Enhanced IEEE 802.11.p-Based MAC Protocols for Vehicular Ad hoc Networks." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36168.

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The Intelligent Transportation System (ITS) is a cooperative system that relies on reliable and robust communication schemes among vehicles and between vehicles and their surroundings. The main objective of the ITS is to ensure the safety of vehicle drivers and pedestrians. It provides an efficient and reliable transportation system that enhances traffic management, reduces congestion time, enables smooth traffic re-routing, and avoids economic losses. An essential part of the ITS is the Vehicular Ad hoc Network (VANET). VANET enables the setup of Vehicle-to-Vehicle (V2V) as well as Vehicle-t

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Boquet, Pujadas Guillem. "Contributions to Intelligent Transportation Systems. Big data analytics for reliable and valuable data." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673761.

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La indústria del transport ha entrat en l’era del big data. Part de les dades difoses pels vehicles i la infraestructura connectats està sent explotada per Intelligent Transport Systems (ITS), aplicacions avançades en què les tecnologies de la informació i la comunicació s’apliquen en el camp de la gestió del tràfic i transport per carretera. En un futur pròxim, és probable que tots els vehicles es comuniquin entre si i amb la infraestructura circumdant, per exemple, per advertir a altres sobre incidents de trànsit o les condicions de la carretera. No obstant això, els requisits de connectivit

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Abbasi, Mahdi. "Characterization of a 5GHz Modular Radio Frontend for WLAN Based on IEEE 802.11p." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-3408.

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<p>The number of vehicles has increased significantly in recent years, which causeshigh density in traffic and further problems like accidents and road congestions.A solution regarding to this problem is vehicle-to-vehicle communication, wherevehicles are able to communicate with their neighboring vehicles even in the absenceof a central base station, to provide safer and more efficient roads and toincrease passenger safety.The goal of this thesis is to investigate basic physical layer parameters of ainter-vehicle communication system, like emission power, spectral emission, errorvector magnit

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Puttagunta, Harsha. "Simulators in Vehicular Networks Research and Performance Evaluation of 802.11p in Vehicular Networks." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin161407872757092.

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Minack, Enrico. "Evaluation of the influence of channel conditions on Car2X Communication." Master's thesis, Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200501571.

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The C2X Communication is of high interest to the automotive industry. Ongoing research on this topic mainly bases on the simulation of Vehicular Ad Hoc Networks. In order to estimate the necessary level of simulation details their impact on the results needs to be examined. This thesis focuses on different channel models as the freespace, shadowing, and Ricean model, along with varying parameters. For these simulations the network simulator ns-2 is extended to provide IEEE 802.11p compliance. However, the WAVE mode is not considered since it is still under development and not finally approved.

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Joakim, Carlsson. "CloudMAC Frame Prioritization : QoS and routing of IEEE802.11 frames in a Opendaylight controlled network." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36313.

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Wireless networks are common in large organisations that can cover multiple floors and buildings. Wireless networks become expensive as they grow and more control and coordination is needed to operate and management them. This thesis describes how CloudMAC, a software defined networking solution (SDN), were implemented in OpenDaylight Hydrogen, a SDN controller. CloudMAC reduces complexity in large wireless local area networks. CloudMAC splits access points (AP) into, a physical (accesses the wireless medium) and a logical (handles the processing of data) part. These two part are then placed i

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Eian, Martin. "Robustness in Wireless Network Access Protocols." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-17479.

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Wireless network access protocols are used in numerous safety critical applications. Network availability is essential for safety critical applications,since loss of availability can cause personal or material damage. An adversary can disrupt the availability of a wireless network using denial of service (DoS) attacks. The most widely used wireless protocols are vulnerable to DoS attacks. Researchers have published DoS attacks against IEEE 802.11 local area networks (LANs), IEEE 802.16 wide area networks (WANs) and GSM andUMTS mobile networks. In this work, we analyze DoS vulnerabilities in wi

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Hauenstein, Carlos Dionísio. "Wireless LAN : a grande questão ; 802.11a ou 802.11b?" reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2002. http://hdl.handle.net/10183/3314.

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Este trabalho apresenta, inicialmente, uma análise comparativa detalhada dos dois padrões, IEEE 802.11a e IEEE802.11b, que foram apresentados recentemente pelo IEEE na área de redes sem fio (wireless). São apresentadas as principais diferenças tecnológicas dos dois padrões, no que se refere, principalmente, à arquitetura, funções de controle, segurança, desempenho e custo de implementação destas duas tecnologias de redes wireless. São avaliados também os aspectos de interoperabilidade, quando estas redes são integradas em redes corporativas fixas, que são baseadas, principalmente, em redes Eth

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Odelstav, Albin. "Evaluation of Simulated 802.11p and LTE Communication at Road Intersections and Urban Area of Self Driving Cars." Thesis, Mittuniversitetet, Institutionen för informationssystem och –teknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-42927.

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Det här arbetet har undersökt hur mycket end-to-end delay, packet reception ratio och throughput påverkas av antal bilar, bilars hastighet samt avståndet mellan bilar i en simulerad miljö när standarden IEEE 802.11p och LTE-V2X används för kommunikation. Båda teknologierna använder det licensierade Intelligent Transport System-bandet på 5,9 GHz. För att simulera IEEE 802.11p användes ramverket Veins som kombinerar nätverkssimulatorn OMNeT++ med trafiksimulatorn SUMO, och för LTE-V2X användes SimuLTE. Alla bilar skickade säkerhetsmeddelanden på 320 byte var 100 millisekund. I stadsområdet, kors

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Shooshtary, Samaneh. "Development of a MATLAB Simulation Environment for Vehicle-to-Vehicle and Infrastructure Communication Based on IEEE 802.11p." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-3463.

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<p>This thesis describes the simulation of the proposed IEEE 802.11p Physical layer (PHY). A MATLAB simulation is carried out in order to analyze baseband processing of the transceiver. Orthogonal Frequency Division Multiplexing (OFDM) is applied in this project according to the IEEE 802.11p standard, which allows transmission data rates from 3 up to 27Mbps. Distinct modulation schemes, Binary Phase Shift Keying (BPSK), Quadrate Phase Shift Keying (QPSK) and Quadrature Amplitude modulation (QAM), are used according to differing data rates. These schemes are combined with time interleaving and

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Nguyen-Minh, Huong. "Contribution to the Intelligent Transportation System : security of Safety Applications in Vehicle Ad hoc Networks." Thesis, Avignon, 2016. http://www.theses.fr/2016AVIG0212/document.

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Le développement du transport partout dans le monde a fourni un grand nombre d'avantages pour de nombreux aspects de la vie humaine. Les systèmes de transport intelligents (ITS) sont des applications avancées qui visent à rendre les réseaux de transport plus sûrs, plus pratiques et plus intelligents. Selon leurs usages, ils peuvent être classés en deux types d'applications ITS, qui sont des applications de sûreté et des applications non-sûreté. Le réseau de véhicules ad hoc (VANET) est un élément clé des systèmes ITS, car il permet la communication entre les unités de transport. Ces communicat

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Salem, Fatma. "Fiabilité et sécurité des systèmes embarqués communicants pour les transports : modélisation et optimisation." Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0034.

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Véhicule-à-tous (V2X) se réfère à un Système de Transport Intelligent (ITS) où les véhicules et l'infrastructure sont interconnectés. Cette connectivité permet une connaissance précise des conditions de circulation sur l'ensemble du réseau routier, ce qui contribue à améliorer la sécurité routière, réduire les temps d'encombrement et éviter les pertes économiques. Cette communication permet aussi une variété de nouvelles applications pour la sécurité routière et l'infodivertissement. Bien que la communauté de scientifique ait réalisé de grands progrès dans l'étude sur le V2X, il reste encore d

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LOBO, JÚNIOR Aleciano Ferreira. "Modelos para o planejamento de infraestruturas de comunicações veiculares." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18586.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-04-19T13:47:30Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Aleciano_Lobo_Junior_Dissertacao.pdf: 9925931 bytes, checksum: bcf8228c8e29cef0e7302ea7716436ec (MD5)<br>Made available in DSpace on 2017-04-19T13:47:31Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Aleciano_Lobo_Junior_Dissertacao.pdf: 9925931 bytes, checksum: bcf8228c8e29cef0e7302ea7716436ec (MD5) Previous issue date: 2016-08-24<br>CNPQ<br>A i

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Bellache-Sayah, Thiwiza. "Contrôle dynamique des communications dans un environnement v2v et v2i." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV011/document.

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Les systèmes de transport intelligents coopératifs permettent la communication des véhicules entre eux ainsi qu'avec l'infrastructure, afin d'assurer la disponibilité des informations d'une manière plus fiable sur les véhicules, leurs positions et les conditions de la route. Cet échange d'informations pertinentes permet d'améliorer la sécurité routière, réduire les incidents du trafic et d'assurer l'efficacité de la mobilité des véhicules. IEEE 802.11p est standardisé comme la technologie par défaut pour les communications des véhicules. Dans ce contexte, le standard européen ETSI s'attaque en

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Togou, Mohammed Amine. "Enhancing infotainment applications quality of service in vehicular ad hoc networks." Thèse, Troyes, 2017. http://hdl.handle.net/1866/19537.

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Les réseaux ad hoc de véhicules accueillent une multitude d’applications intéressantes. Parmi celles-ci, les applications d’info-divertissement visent à améliorer l’expérience des passagers. Ces applications ont des exigences rigides en termes de délai de livraison et de débit. De nombreuses approches ont été proposées pour assurer la qualité du service des dites applications. Elles sont réparties en deux couches : réseau et contrôle d’accès. Toutefois, ces méthodes présentent plusieurs lacunes. Cette thèse a trois volets. Le premier aborde la question du routage dans le milieu urbain. A ce

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Marušek, Michal. "Zefektivnění zabezpečení bezdrátových sítí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218098.

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Nowadays every wireless radio-communication services encompass huge type of technology used for transfer video, voice or data. Wireless communication is the most expanded branch and many companies are using this technology because of low cost and simply management. The biggest advantage is easy connection to shared wireless medium and allows users of network to move around whole covered area. The most expanded types of wireless networks are called Wireless LAN (WLAN). With rising number of WLANs is rising chance to attack shared wireless medium by hacker and many sensitive information can be s

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Shaikh, Kamil Mohiuddin. "The Performance Evaluation of OFDM Based WLAN (IEEE 802.11a and 802.11g)." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3079.

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ABSTRACT In the past decade there has been a steady growth in development and implementation of wireless Local Area Networks and emerged as in the largest sectors of the telecommunication industry. Wireless local area network (WLANs) provides connectivity, mobility, and much higher performance and achievable data rate. WLAN is a new medium of access technology in the Local Area Network (LAN) world. Mostly WLAN applications are used in public sectors such as airports, banks, hotels, offices, city centres because of the flexibility of the people. Orthongonal Frequency Division Multiplexing OFDM

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Fanciulli, Matteo. "Algoritmi distribuiti per la gestione del traffico veicolare." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1605/.

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Štohanzl, Milan. "Realizace zařízení pro komunikaci Car2X a Car2Car." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219088.

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This work explores possibilities of Car2Car and Car2X communication. It contains survey of system properties, types of transmission messages, etc. It represents architecture of the system and deals with technical expectations and limitations of system. In the light of the fact that this work is created in the time, when development of this system hasn’t finished yet, the work doesn’t contain details which would allow deeper technical view about area of vehicular communication. The work also deals with the possibility of realization of device, communicating with a similar standard. Like the mos

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Škodák, Jaroslav. "Zabezpečení bezdrátových sítí IEEE 802.11." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217503.

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This work describes available and used standards, protocols and mechanisms used to secure IEEE 802.11 wireless networks. In the next section are listed vulnerabilities and possible attacks against different types of security. The principles of individual attacks on authentication, WEP security and WPA/WPA2 personal mode are described and realized using various software especially linux program aircrack-ng. Password for WEP security is obtained by passive eavesdropping data, using ARP replay injection and by creating own frames. The last two methods are used to generate traffic on the network,

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Bouchaala, Younes. "Gestion des messages de sécurité dans les réseaux VANET." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV101/document.

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Les exigences de Qualité de Service (QoS) des applications VANET varient selon la nature et le type de l’application. Par conséquent, un protocole de communication VANET doit pouvoir répondre aux diverses exigences de QoS selon le type du trafic. Dans VANET, le canal de transmission est partagé par tous les véhicules en utilisant une même fréquence radio. Une mauvaise exploitation du canal peut donc conduire à des collisions et peut aussi engendrer un gaspillage de la bande passante. Un protocole MAC doit être alors conçu pour partager le canal entre les différents noeuds d’une manière efficac

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Balacca, Federico. "Tecnologie per telecomunicazioni tra veicoli." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Al giorno d’oggi le vetture offrono un gran numero di servizi che tempo fa non erano nemmeno immaginabili, a partire dalla sicurezza passiva fino ad arrivare alla guida semi-autonoma. Tutto questo è reso possibile grazie all’evoluzione tecnologica ed in particolare grazie ad un gran numero di sensori e centraline che raccolgono e si scambiano continuamente dati su qualunque parametro operativo del veicolo. Lo scopo di questa tesi è quello di fornire le informazioni basilari sui principali standard e tecnologie che permettono la comunicazione tra veicoli ed infrastrutture. Successivamente verrà

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Englund, Johan. "Determining suitability of the IEEE1609 standard for PRT systems." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8115.

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Personal Rapid Transit systems have high demands on its reliability and security. Many of the fundamental functions needed by a PRT system can be provided by a wireless radio communication link. The goal of this thesis is to determine if the emerging radio standard for intelligent transportation systems is suitable for providing some of the needed functions. The emphasis of this work is to understand the features of the standard that are important for a PRT system and to verify them with simulation.

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Bergh, Fredrik, and Johan Andersson. "Channel measurement and communication module for the Grand Cooperative Driving Challenge." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15329.

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Vehicular ad hoc networks (VANETs) are a hot topic in the intelligent transport system (ITS) area. The introduction of wireless communications between vehicles will enable many useful applications to enhance road traffic safety as well to increase efficiency. The standardization of IEEE 802.11p, being an amendment to IEEE 802.11 intended for VANETS, faces many challenges. In Europe a 30 MHz spectrum at 5.9 GHz have been dedicated for ITS and this spectrum has to be used to its full potential. For this reason this thesis compares a 20 MHz wide frequency channel with a 10 MHz wide through measur

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Vigo, John Louis Jr. "Wireless Intrusion Detection Sytem." ScholarWorks@UNO, 2004. http://scholarworks.uno.edu/td/203.

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The decrease in price and the ease of use of wireless network devices make them an attractive alternative to standard wired networks. However, the intrinsic insecurity of wireless media and weaknesses in the standards for use of wireless media leave wireless networks vulnerable to attacks from unauthorized users. The intrinsic insecurity of wireless media results from radio signals extending beyond the networks intended coverage area and the weaknesses in the standards result from the methods used for authorization and privacy. These insecurities restrict the use of wireless networks

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Mustovic, Adam. "Wireless Information Transfer in an Indoor Factory or Warehouse Environment." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127705.

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Wireless technologies and networks are a part of our daily lives and we are surrounded by a constant stream of wireless signals. Unfortunately, there are a lot of limitations. At Toyota Material Handling Europe, future demands and expectations are raising but the technologies available today are not adapting fast enough. Indoor factory environments, moving network nodes and rapidly changing topologies are demanding situations. In this new Internet of Things day and age, transferring information in these challenging environments, the standard master and slave configuration is not enough. This r

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Soleimani, Hossein. "LTE/LTE-Advanced for Vehicular Safety Applications." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37840.

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IEEE 802.11p, the known standard for Vehicular Adhoc NETworks (VANETs), suffers from scalability issues and unbounded delay. In addition, the desire to use networks already in existence has created motivation for using cellular networks for vehicular applications. LTE-Advanced is one of the most promising access technologies in the wireless field, providing high data rate, low latency, and a large coverage area. Thus, LTE/LTE-A can be potential access technologies for supporting vehicular applications. Vehicular safety applications are based on broadcasting messages to neighboring vehicles. T

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Giang, Anh Tuan. "Capacity of vehicular Ad-hoc NETwork." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-00989836.

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In recent years, Inter Vehicle Communication (IVC) has become an intensive research area, as part of Intelligent Transportation Systems. It supposes that all, or a subset of the vehicles is equipped with radio devices, enabling communication between them. IEEE 802.11p (standardized for vehicular communication) shows a great deal of promise. By using ad hoc mode, this radio technology allows vehicles to extend their scopes of communication and thus forming a Multi-hop wireless Ad-hoc NETwork, also called Vehicular Ad-hoc NETwork (VANET). This thesis addresses a fundamental problem of VANET: the

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Mölleborg, Gabriel, and Joel Henriksson. "Draft-N 2.0 : En jämförande studie av täckningsgrad och bandbredd i trådlösa nätverk av typ hot-spot med IEEE 802.11A/G respektive IEEE 802.11N Draft 2.0." Thesis, University of Kalmar, School of Communication and Design, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-446.

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<p>Rapporten är en jämförande studie av täckningsgrad och bandbredd i trådlösa nätverk av typ hot-spot med IEEE 802.11A/G respektive IEEE 802.11N Draft 2.0. Studien är gjord i tre olika scenarion på Kvarnholmen i Kalmar under april och maj månad 2008.</p>

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Klampár, Marián. "Návrh komunikace mezi pohybujícími se vozidly." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218734.

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The purpose of this thesis is to show up possibilities of inter-vehicle communication and to introduce new approaches in communication for the purpose of enhancing the security and the fluency of vehicle transportation. This thesis also highlights vulnerabilities in communication. The main goal is the analysis of existing technology and the design of protocol for data transfer with focus on minimizing handover time of informations. Part of the design is a simulation of communication based on acquired information.

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Žlůva, Ivan. "Optimalizace bezdrátových WiFi distribuovaných sítí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228849.

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This thesis describes theoretic proposal and two practical realization of multi - point wireless network, first for communications between two endpoints and second for wireless signal coverage of a structured space. The wireless network is realized by the equipment working in unlicenced 2,4GHz and 5GHz ISM band. The wireless device are configured in three different wireless mods: WDS, WDS bridge and AP. This paper contains short information about IEEE 802.11a/b/g/n standard and associated proprietary wireless specifications. Practical workshop describes several variants connections and present

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Hong, Wei-Jyun, and 洪維駿. "Performance comparison between IEEE 802.11a-based and IEEE 802.11p-based wireless vehicular networks." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/70961222267786987306.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>97<br>The IEEE 802.11p/1609 standards define the WAVE Independent basic service set (WIBSS) for vehicular ad-hoc networks to carry out vehicle-to-vehicle (V2V) communication. However, the design of a WIBSS cannot utilize the multi-channel property of an 802.11p/1609 network. To make use of these channels, an extra protocol is needed to negotiate and synchronize the channel used among nodes, which may complicate the design of the MAC layer. These observations motivated us to find an easy-to-implement solution for it.In this thesis, we first observed the perform

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Kao, Ruei-Sheng, and 高睿勝. "Fast Handoff in IEEE 802.11 Networks：IEEE 802.11F versus IEEE 802.11r." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/62118026528343184846.

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碩士<br>雲林科技大學<br>電機工程系碩士班<br>98<br>As wireless communication technology progresses rapidly, more and more wireless Local Area Networks (LANs) have been deployed as a mainstream connectivity solution for a broad range of users nowadays. While wireless LANs provide users in public venues such as campuses or enterprises with convenient access to the Internet, how to assure users of secure fast handoff support remains an important issue. When handoff occurs, i.e., a station switches its radio link to different access points (APs), reauthentication and re-association procedures with new APs account

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Huang, Sheng-Yeh, and 黃聖曄. "Subspace-Tracking Channel Estimation for IEEE 802.11p." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9dmw83.

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碩士<br>國立交通大學<br>電子研究所<br>106<br>In this thesis, we study downlink channel estimation based on the IEEE 802.11p system designed for vehicular communications. We investigate the performance of subspace-tracking channel estimation method in a IEEE 802.11p downlink system. And we simulate the channel estimation method with MATLAB. We use subspace-tracking channel estimation method as an intermediate step after obtaining the least-squares (LS) estimate over the pilot subcarriers, whose purpose is to increase the accuracy of the estimate over the pilot subcarriers. And this preliminary estimate is

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Chen, Yen-Hsiang, and 陳彥翔. "Slow Start Backoff Mechanism for IEEE 802.11p VANETs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/83993360430337043943.

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碩士<br>國立彰化師範大學<br>資訊工程學系<br>98<br>In recent years, the tremendous deployment and rapidly growing application of wireless access technologies. Nowadays, IEEE 802.11p protocol is also known as Wireless Accesses for the Vehicular Environment (WAVE), provides Dedicated Short Range Communication (DSRC) for future Vehicular Ad Hoc Networks (VANETs). IEEE 802.11p protocol supports Intelligent Transportation Systems (ITS) applications that inform drivers with useful information about the road condition and traffic accidents immediately. However, the protocol uses carrier sense multiple access/collisio

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