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ZigBee implementation for Automotive Industry
Zatloukal, Martin ; Maršálek, Roman (referee) ; Prokopec, Jan (advisor)
This bachelor’s thesis describes possibilities of usage of ZigBee communication protocol in automotive industry, transport and logistics. Thesis also deals with ways of practical implementation of ZigBee protocol including typical cases solutions, designing and realization of necessary electrotechnical devices and modules followed by compilation of control software and experimental measurements of these devices in real traffic flow. In the first part of thesis, there are some basic features and parameters of ZigBee reminded, followed by ways of ZigBee communicator usage description and adumbrating how to perform integration with existing practical systems. The second part is about analysis of ZigBee data system construction, communication system scheme design and pre-projection of block schemes of its particular cells. The third part concretizes requested functions and features of these cells and describes ways of its hardware realization. The fourth section describes controlling software design, connection and controll of functions using PC and additional programs, using of X-CTU software offered by MaxStream Company to set up XBee parameters and using of AVR Studio 4 offered by Atmel Company to set up ATmega16 processor. The last part is taken by completation of hardware and software, tests with a few of XBee chips and network nodes in laboratory conditions and examples from the real traffic range measurement.
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Implementation of ethernet communication inteface into FPGA chip
Skibik, Petr ; Fujcik, Lukáš (referee) ; Bohrn, Marek (advisor)
The thesis deals with the implementation of Ethernet-based network communication interface into FPGA chip. VHDL programming language is used for description of the hardware. The interface includes the implementation of link-layer Ethernet protocol and network protocols such as IPv4, ARP, ICMP and UDP. The final design allows bi-directional communication on the transport-layer level of TCP/IP model. The designed interface was implemented into Virtex5 FPGA chip on development board ML506 by Xilinx.
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Design and realization of wireless interface ODBII-XBee
Zatloukal, Martin ; Frýza, Tomáš (referee) ; Prokopec, Jan (advisor)
This master’s thesis describes possibilities of usage of ZigBee communication protocol and integrated circuit ELM 327 in problem of realization universal diagnostic device, running by OBDII communication standards, which can be used to monitor function of all car´s electronic systems. Thesis also deals with design and realization of necessary electro technical devices and modules followed by compilation of control software and experimental measurements of these devices in real traffic flow. In the first part of project, there are reminded some basic features and parameters of OBDII, followed by description of ways how to use OBDII and adumbrating how to realize universal diagnostic system. The analysis of ZigBee system focused on XBee circuits follows. Construction, ways of data transfer and possibilities of controlling are described. Integrated circuits produced by ELM Electronics Company are introduced and possibilities of usage ELM 327 are described as requested by main task. Second part talks about designing of electronic circuits of this system, assembling schematic diagram and designing sources for production of PCB. Physical realization of these circuits and its first start is also included. Thesis finishes by dealing with practical experiences and measurements using real vehicles. This part talks also about means to improve system by several software solutions to reach more effective functioning of created device.
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Generation of data units in OPNET Modeler environment
Mikulica, Vladimír ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
This dissertation deals with the generating of data units at different levels of TCP/IP network model in OPNET Modeler environment. A part of the dissertation is a brief introduction to the simulation environment OPNET Modeler where important components of this comprehensive simulation software are elucidated. The structure of my dissertation reflects individual layers of the model TCP/IP, whereas the function of the process model OPNET Modeler and the data unit used at corresponding levels of TCP/IP is always described. Particular parts of communication models that were created in the simulation environment OPNET Modeler at selected layers of the network model TCP/IP are closely documented in each chapter. Relevant scenarios are described in such a way that they can be later re-arranged by eventual customers.
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Model of computer network in MATLAB/SIMULINK environment
Zedníček, Petr ; Zeman, Václav (referee) ; Kolka, Zdeněk (advisor)
The bachelor thesis deals with simulation of TCP protocol behaviour in Wireless optical environment. The thesis examines the various parameters of the protocol and evaluates their response to the transmission speed. The key objectives of the thesis are the introduction to the problems of communication, specially the description of the transport layer architecture, TCP / IP and congestion management mechanism NewReno. A large part of the thesis is devoted to modelling communication points and a model of optical wireless connections. The results will be applicable to create a new communication protocol for Wireless optical environment.
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Methods for Quality of Service measurement in Wi-Fi networks
Bachan, Jiří ; Kolka, Zdeněk (referee) ; Prokopec, Jan (advisor)
This work deals with the wireless Wi-Fi networks, that used unlicenced ISM frequency band 2,4 GHz. These wireless networks are very extended in these days and used mainly for the Internet connection. With the multimedia data transfers expanding it’s necessary to ensure the specific quality of service QoS in wireless networks mainly for applications, which are sensitive to delay or packets lost. The main aim of this work is to describe Wi-Fi networks based on IEEE 802.11b/g/n standards, description of QoS techniques according to IEEE 802.11e standard and description of parameters describing QoS for the VoIP services. The practical part is divided on a two parts. The problems of measuring the radio link quality and the creation of simple program for quality of wireless connection analysis are solved in the first part. The second part incluledes measuring of the lost packets number in Wi-Fi network with the commercial application AirMagnet Laptop Wireless LAN Analyzer and measuring of the signal noise influence with the help of spectrum analyzer and vector signal generator.
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Usage of packet wireless network analyzer Wireshark
SIROVÝ, Ladislav
This paper contains information about performing computer network analysis using Wireshark application and about wireless network security in general. This involves practical testing of various security models and measuring wireless security coverage in specific areas. The general overview of the most widely used open-source network analyzers and their comparsion is also included.
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VoIP- IP network voice communication
BERAN, Václav
The possibility for using the VoIP technology as an alternative solution for the te-lephone system is very attractive. The main reason is the widely expanded computer sites and also their higher effectiveness. The main goal of the work is to describe the VoIP technology and create the first publication in Czech republic which deals with this theme in details. First of all I concentrate on the explanation of the basic words, conceptions and principles necessary to fully understand the whole field. The main scope of the work is VoIP technology which is described in third chapter. There are described also the methods of voice coding, signalling protocols (SIP, H.323, MGCP, IAX) and issues related with QoS. The work also covers the Skype program with descriptions of it's principles, installation and control.
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Problematika firewallů
Wagner, Oto ; Čermák, Igor (advisor) ; Beneš, Jiří (referee)
Práce se zabývá problematikou firewallů a jejich vývojem. Rozdělena je na 4 hlavní části. V první (teoretické) části jsou rozpracovány některé důležité koncepty síťového provozu ? především pak ty s dopadem na zajištění bezpečného přístupu k síti. Rovněž jsou roztříděny firewally a zmíněny konkrétní dopady (přínosy) jejich nasazení. Na konci kapitoly si ještě rozebereme Standardy, které v této oblasti existují (především pak TCSEC a CC). Další část je věnována samotnému vývoji fw a především pak současným trendům posledních 5 let. Rozebrány jsou rovněž kromě jejich dopadů na bezpečnost i externality, které s nimi byly spojeny (změna chování uživatelů, rychlost, propustnost, atp.). Konec kapitoly obsahuje ještě výhledy předpokládaného vývoje v této oblasti. V praktické části se podíváme na některé nejdůležitější způsoby ochrany. V části terminace otestujeme všechny publikované metody terminace a možnosti ochrany. Nakonec v části odchozí komunikace provedeme test všech dostupných metod průniku ven ze sítě ? vyzkoušíme tedy všechny publikované techniky, jak dostat data nepozorovaně ven z počítače a zjistíme, jaké jsou možnosti obrany u konkrétní techniky. V poslední části se podíváme na některá důležitá či zajímavá praktická řešení z oblasti bezpečnosti sítí. Především pak na zabezpečení sítě Vysoké Školy Ekonomické v Praze, Checkpoint Firewall-1, a nakonec jeho nasazení na VŠE.
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