Approved for public release, distribution is unlimited / The objective of this research is to analyze the network performance and sensor functionality, efficacy and usability of IEEE 802.x wireless MESH networks within a DoD Tactical network environment. Multiple sensor configurations operating with wireless MESH network technologies will be researched and analyzed for performance in expeditionary environment situations. Specifically, this thesis will attempt establish the foundation for the development of wireless MESH "network health" models by examining the performance of sensors operating within a MESH network and define which network performance metrics equate to good quality of service. This research will experiment with different application, sensor, and network configurations of currently available COTS components, such as, voice, video and data hardware. This thesis will lay the groundwork for wireless network MESH predictability, which will enable the optimal use of sensors within a tactical network environment. / Lieutenant Commander, United States Navy

Approved for public release; distribution is unlimited / This thesis derives design tools for determining and improving performances of communication links that use M - QAM coherent demodulators associated with Viterbi soft-decision decoding (SDD) in Additive White Gaussian Noise (AWGN) and Nakagami-m channels. Performance analyses for 16-QAM, 64-QAM, QPSK and BPSK associated with up to three convolutional codes, including the one used by the IEEE 802.11a standard and the dual-k code, are presented as practical applications. The main tools relate to the analytical derivation of upper bounds of the probability of bit error (Pb) for any M -ary coherent demodulator followed by SDD, a methodology for improving an upper bound of Pb tightening it to realistic data, and the obtaining of the specific ( ) d b spectrum for any convolutional code intended to operate with a certain M-symbol modulation. All derivations involve statistical considerations over the AWGN and Nakagami-m channels, as well as in-depth analyses of modulator constellations. The tools and models developed can provide great optimization to bandwidth-limited system designs that require high data rates, especially the wireless ones. Consequently, they have great application to many fields of digital communications, such as cellular telephony, wireless networking, satellite links, ship-to-shore and ship -to-ship communications. / http://hdl.handle.net/10945/1090 / Lieutenant Commander, Brazilian Navy

Approved for public release; distribution is unlimited. / Wireless networks can be broadly classified into two types - infrastructure based networks and ad hoc networks. The former uses fixed base stations (infrastructure) which are responsible for coordinating communication between the mobile hosts (nodes). These base stations are interconnected by wired back bones, where as mobile nodes communicate with the base station through the wireless media. The latter one consists of mobile nodes which communicate with each other through wireless medium without any fixed infrastructure. Hence there is no centralized infrastructure that takes care of the routing of information among the participants in the network. There has been a growing interest in ad hoc network in recent years as mobile devices have become more powerful and are capable of processing data like their desktop counterparts. When such a capability is available these devices should be able to share information among them without reliance on existing network infrastructure. Mobile devices are self configurable into either infrastructure or ad hoc mode. Protocols and software have been developed to enable mobile devices to connect to an infrastructure node, where as the same is not the case in the ad hoc environment. Host mobility causes frequent and unpredictable topological changes in a wireless environment. Finding and maintaining routes in ad hoc networks is a non trivial task. This thesis will develop collaborative services in an ad hoc (802.11) wireless environment. / Major, Indian Air Force

University of the Witwatersrand Faculty of Engineering and the Built Environment School of Information and Electrical Engineering / Mobile Broadband is now more of a necessity than a luxury, especially amongst the younger generation, irrespective of where they live. Mobile WiMax and LTE, the latest and fastest Mobile Broadband technologies, mark significant improvements over 3G networks because they use IP (Internet Protocol) end-to-end. To end-users, this means faster network speeds, better quality services, and increased coverage area. To the Network Operators, this means simplified network architectures, efficient use of resources, and improved security. In this report, the different issues and challenges related to deploying Mobile WiMax (802.16e or 802.16m) in rural South Africa, were identifed and explored. In this project, Atoll, SONAR, and Touch Point analysis tools were used to determine which Mobile Broadband technology is economically and technically suited for rural South Africa. It was found that LTE yields superior performance results than WiMax, which in turn yields superior performance results to all other existing 3G technologies. However it will take time for LTE to reach rural areas therefore WiMax can be considered as a solution to extend Broadband services to rural South Africa and thus assist in bridging the digital divide. Recommendations on how best to deploy Mobile WiMax are made based on observations made from the experimental work. / MT2017

L'objectif de cette thèse CIFRE est de contribuer à la communication véhiculaire autonome et au développement de la mobilité urbaine. Les travaux sont basés sur les limitations et défis de la communication par radio pour les applications de sécurité et envisagent de déployer le système d'éclairage des véhicules en tant que solution de communication de soutien pour le platooning d'IVC-activées par VC Véhicules autonomes. L'objectif principale de cette recherche doctorale consiste à intégrer le système VLC dans l'architecture existante de C-ITS en développant un prototype VLC, ainsi que des algorithmes de transfert suffisants permettant VLC, RF et des solutions basées sur la perception afin d'assurer les exigences de sécurité maximales et l'échange continu d'informations entre les véhicules. La faisabilité et l'efficacité de la mise en oeuvre du système et des algorithmes de transfert ont fait l'objet de recherches approfondies sur six chapitres, destinés à faciliter une progression logique des matériaux et permettre un accès relativement facile. En plus de l'amélioration de la capacité routière en utilisant les systèmes de conduite autonome à la base de convoi. Les simulations réalisées ainsi que les résultats expérimentaux ont montré que l'intégration de VLC avec les solutions existantes RF a un avantage certain dans la qualité du canal de communication et les exigences de sécurité d'un système de platooning quand un algorithme approprié est utilisé. / This thesis effort contributes to the autonomous vehicular communication and urban mobility improvements. The work addresses the main radio-based V2V communication limitations and challenges for ITS hard-safety applications and intends to deploy the vehicular lighting system as a supportive communication solution for platooning of IVC-enabled autonomous vehicles. The ultimate objectives of this Ph.D research are to integrate the VLC system within the existing C-ITS architecture by developing a VLC prototype, together with sufficient, hand-over algorithms enabling VLC, RF, and perception-based solutions in order to ensure the maximum safety requirements and the continuous information exchange between vehicles. The feasibility and efficiency of the VLC-RF system implementation and hand-over algorithms were subjects to deep investigations over six self-contained chapters meant to facilitate a logical progression of materials and to enable a relatively easy access. In addition to the improvement in road capacity by utilizing the convoy-based autonomous driving systems. The carried out simulations followed-up by experimental results proved that the integration of VLC with the existed RF solutions lead to a definite benefit in the communication channel quality and safety requirements of a platooning system when a proper hand-over algorithm is utilized.

L'utilisation de la communication sans fil dans les applications de contrôle offre de nombreux avantages comme la mobilité. Toutefois, la communication sans fil souffre de nombreux inconvénients tels que la perte d'information, délais aléatoires. Ces problèmes sont essentiellement induits par le non déterministe du comportement de la communication sans fil qui peut avoir un impact négatif sur la performance du système. L'objectif de ce travail porte sur l'amélioration des performances de Systèmes Discrets Contrôlés via un Réseau Sans fil. Ses systèmes sont caractérisés par une commande logique distribuée sur des automates programmables et des boîtiers d'entrées/sorties déportés communiquant via un réseau de communication sans fil, IEEE 802.11. L'approche proposée repose sur un processus de co-conception basé : un, sur une modélisation conjointe des comportements de la commande et du réseau au travers de modèles SED déterministes pour la commande et stochastiques pour le réseau, et sur la simulation pour évaluer les performances des SDCR sans fil et notamment leur temps de réponse. Deux, la proposition d'un algorithme qui alloue dynamiquement les priorités définies par l'IEEE 802.11e sur les trafics de communication en fonction des besoins et des états de la commande; cet algorithme est évalué sur un cas d'étude, pour lequel la communication sans fil induit des risques de collision entre des équipements d'une installation industrielle, en utilisant l'environnement de simulation précédemment défini. Les simulations montrent une amélioration de la performance du système surtout dans des cas où le réseau est très chargé / Using wireless communication in the control system introduces many advantages like reduced wiring costs but also many drawbacks such as the delays, packet losses... which may disturb the system performance. The objective of this thesis is to improve the performance of a Wireless Networked Discrete Control System. This kind of system is characterized with a logic command distributed among PLC and plant part communicating through a wireless network, IEEE 802.11. The proposed approach is based on a co-design concept by simultaneously modeling the behavior of the command part (deterministic), and network part (non deterministic). Simulation tools do not cope with this co-design point of view because they are generally either ?control design? or ?network analysis? dedicated. Two solutions are explored: first, by integrating the network model into a control-oriented tool, Matlab-Truetime library and second, by integrating the discrete control system behavior into a network-oriented tool, OPNET. Comparisons between these tools confirm the possibility of modeling a WNDCS using Matlab-Truetime (with some modifications) and OPNET. Moreover, an algorithm is proposed to improve the global system performance; it dynamically allocates IEEE 802.11e priorities to the communication traffic with regard to the control requirements and the current state of the system, but also by taking into account the current quality of service provided by the network. Simulations of a case study performed using OPNET have highlighted the efficiency of the proposed algorithm

Made available in DSpace on 2016-04-04T18:25:00Z (GMT). No. of bitstreams: 1 Everton Dias de Oliveira.pdf: 3326034 bytes, checksum: 1cbd1cf1a33f81db24d9e630a5cddb94 (MD5) Previous issue date: 2015-12-14 / This paper presents the development of a system for monitoring surfasse temperature and air temperature in buildings in urban areas, using wireless data transmission with the IEEE 802.11 and IEEE 802.15.4 standards. This monitoring system includes the development of low sensors that can monitor the temperature of non-destructively, i.e. without the need to reform the building. Deals with the analysis of the use of wireless transmission networks with the IEEE 802.11 standard and the IEEE 802.15.4 standard, as a possible solution for temperature monitoring in buildings using wireless networks. Discusses the development of a technological application capable of performing the monitoring of the air temperature and surface buildings using standard wireless networks IEEE 802.15.4. It also presents a solution for temperature monitoring in intelligent buildings, using the IEEE 802.11 standard. / O presente trabalho apresenta, o desenvolvimento de um sistema para o monitoramento da temperatura de superf?cie e da temperatura do ar em edifica??es no meio urbano, utilizando transmiss?o de dados sem fio com os padr?es IEEE 802.11 e IEEE 802.15.4. Esse sistema de monitoramento compreende o desenvolvimento de sensores de baixo que possam monitorar a temperatura de forma n?o destrutiva, ou seja, sem a necessidade de reformas na edifica??o. Trata da an?lise da utiliza??o das redes de transmiss?o sem fio com o padr?o IEEE 802.11 e com o padr?o IEEE 802.15.4, como possibilidade de solu??o para o monitoramento da temperatura em edifica??es usando redes sem fio. Discorre sobre o desenvolvimento de uma aplica??o tecnol?gica capaz de realizar o monitoramento da temperatura do ar e de superf?cie em edifica??es usando redes sem fio padr?o IEEE 802.15.4. E tamb?m apresenta uma solu??o para o monitoramento da temperatura em edif?cios inteligentes, utilizando o padr?o IEEE 802.11.

En esta tesis se estudia la tecnología 802.11n, detallando las modificaciones realizadas en la capa MAC y Física respecto de las tecnologías legadas. Así mismo, cuales serán los resultados como solución de acceso en redes de área local y como podría influir esta tecnología como solución de enlaces punto a punto y punto multipunto de banda ancha en zonas no urbanas. Para esto se analizarán las condiciones de adaptación que deben ser consideradas para lograr los escenarios propuestos en zonas no urbanas de difícil acceso. Finalmente siguiendo los parámetros del último draft se determinará si esta tecnología podría ser en un futuro una solución paralela a otras tecnologías para realizar un enlace de banda ancha de larga distancia. / Tesis

Gao Yan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 70-73). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Literature Survey and Background --- p.6 / Chapter 2.1 --- Capacity of Wireless Networks --- p.6 / Chapter 2.2 --- Physical Layer Techniques --- p.8 / Chapter 2.2.1 --- Radio Propagation Models --- p.8 / Chapter 2.2.2 --- Multiple Access Techniques --- p.11 / Chapter 2.3 --- MAC layer --- p.13 / Chapter 2.3.1 --- An Introduction to the IEEE 802.11 protocol --- p.13 / Chapter 2.3.2 --- Performance Analysis of the IEEE 802.11 protocol in single cell networks --- p.15 / Chapter 3 --- Model and Methodology --- p.18 / Chapter 3.1 --- System Model --- p.18 / Chapter 3.1.1 --- DCF Model --- p.19 / Chapter 3.1.2 --- The Problems of Hidden Node --- p.21 / Chapter 3.2 --- A Methodology to Compute Throughput Capacity --- p.23 / Chapter 3.2.1 --- Constructing a Contention Graph --- p.24 / Chapter 3.2.2 --- Determining the Link Capacity Ei --- p.27 / Chapter 3.2.3 --- Determining the Channel Idle Probability zi --- p.30 / Chapter 3.2.4 --- Detennining the Collision Probability γi --- p.32 / Chapter 3.3 --- Throughput Analysis of a Chain network --- p.35 / Chapter 4 --- Applications of the Proposed Methodology --- p.38 / Chapter 4.1 --- Application 1: Determining the End-to-End Throughput Capacity in Multi-hop Networks --- p.38 / Chapter 4.1.1 --- Routing Optimization --- p.40 / Chapter 4.1.2 --- Offered Load Control --- p.45 / Chapter 4.2 --- Application 2: Determining the Equilibrium Throughput of onehop Networks --- p.47 / Chapter 4.2.1 --- Throughput Capacity of One-Hop Networks --- p.49 / Chapter 4.3 --- Application 3: Optimal Hop Distance in Multi-hop Networks --- p.51 / Chapter 4.3.1 --- Analysis of Regular One-Dimension Network --- p.51 / Chapter 4.3.2 --- Optimal Hop Distance --- p.53 / Chapter 5 --- Simulation and Validation --- p.55 / Chapter 5.1 --- Simulation Environment --- p.55 / Chapter 5.2 --- MAC layer Collisions --- p.56 / Chapter 5.3 --- Single Flow Capacity: --- p.58 / Chapter 5.4 --- Neighboring Traffic Effect: --- p.59 / Chapter 5.5 --- Routing Optimization: --- p.60 / Chapter 5.6 --- Optimal Offered Load Control: --- p.62 / Chapter 5.7 --- Optimal Hop Distance --- p.63 / Chapter 5.7.1 --- One-Source ROD Network --- p.63 / Chapter 5.7.2 --- Two-Source ROD Network --- p.64 / Chapter 5.7.3 --- Simulation Investigation on Hop Distance --- p.65 / Chapter 6 --- Related Work --- p.68 / Chapter 7 --- Conclusion --- p.69

" IEEE 802.11 wireless access points (APs) act as the central communication hub inside homes, connecting all networked devices to the Internet. Home users run a variety of network applications with diverse Quality-of-Service requirements (QoS) through their APs. However, wireless APs are often the bottleneck in residential networks as broadband connection speeds keep increasing. Because of the lack of QoS support and complicated configuration procedures in most off-the-shelf APs, users can experience QoS degradation with their wireless networks, especially when multiple applications are running concurrently. This dissertation presents CATNAP, Classification And Treatment iN an AP , to provide better QoS support for various applications over residential wireless networks, especially timely delivery for real-time applications and high throughput for download-based applications. CATNAP consists of three major components: supporting functions, classifiers, and treatment modules. The supporting functions collect necessary flow level statistics and feed it into the CATNAP classifiers. Then, the CATNAP classifiers categorize flows along three-dimensions: response-based/non-response-based, interactive/non-interactive, and greedy/non-greedy. Each CATNAP traffic category can be directly mapped to one of the following treatments: push/delay, limited advertised window size/drop, and reserve bandwidth. Based on the classification results, the CATNAP treatment module automatically applies the treatment policy to provide better QoS support. CATNAP is implemented with the NS network simulator, and evaluated against DropTail and Strict Priority Queue (SPQ) under various network and traffic conditions. In most simulation cases, CATNAP provides better QoS supports than DropTail: it lowers queuing delay for multimedia applications such as VoIP, games and video, fairly treats FTP flows with various round trip times, and is even functional when misbehaving UDP traffic is present. Unlike current QoS methods, CATNAP is a plug-and-play solution, automatically classifying and treating flows without any user configuration, or any modification to end hosts or applications. "