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Design and simulation of passive optical network PON
Mikauš, Jiří ; Krajsa, Ondřej (referee) ; Reichert, Pavel (advisor)
The aim of master's thesis was to demonstrate chosen PON network in simulation software OPNET Modeler. The work deals with passive optical networks. In particular, solutions that are based on the transmission of Ethernet frames. EPON and 10GEPON standards are described in theoretical section. EPON Standard was introduced already in 2004. Newer 10GEOPN is back compatible, which is ideal as a suitable solution for modern network with a high data rates demands. The practical part describes process of developing network nodes for passive optical network. EPON model was developed in simulation tool, that demonstrates basic features of the standard IEEE 802.3ah. The simulation results are demonstrated in last section.
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Network service testing with WAN network emulator and load simulators
Kocáb, Marek ; Krajsa, Ondřej (referee) ; Novotný, Vít (advisor)
The main task of this thesis was to explore the requirements of different telecommunications services on the network parameter, that are packet delay, packet loss, throughput, jitter. Make to test network service with WAN network emulator and load simulators. Next focus was to explore TCP congestion avoidance algorithms and focus on their throughput. The purpose of the first chapter is to introduce Quality of Service (QoS) for VoIP, video conversation, streaming audio, streaming video and data. The second chapter are to explore various types of delay, that are created from the sender through network device, transmission media to the recipient. The third chapter is to introduce NetDisturb application. It is application, that can emulate real properties of the data network and incoming traffic affect example packet delay, packet loss, bandwidth limit and so on. The key objectives of the fourth and fifth part is TCP protocol and TCP congestion avoidance algorithms. Hier are to introduce TCP protocol basic properties, congestion avoidance mechanisms and analysis of TCP congestion avoidance algorithms. In the practical part are created two laboratory exercises. First laboratory exercise is designed on the implementation QoS for various types of traffic. Second laboratory exercise is focused on the analysis TCP congestion avoidance algorithms and their throughput.
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Comparison of decoding algorithms of Reed-Solomon code
Šicner, Jiří ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
The work deals with the encoding and decoding of Reed-Solomon codes. There is generally described algebraic decoding of Reed-Solomon codes, and then described four methods of decoding, namely Massey-Berlekamp algorithm, Euclidean algoritus, Peterson-Gorenstein-Zierler algorithm and the direct method. These methods are then compared, and some of them are implemented in Matlab.
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Server management application
Smahel, Petr ; Pelka, Tomáš (referee) ; Krajsa, Ondřej (advisor)
This thesis deals with the management of computer servers. The theoretical part describes the client-server architecture, operating system GNU/Linux and server management tools. The second chapter is devoted to design an own application to manage servers. The next chapter describes the design and implementation of individual modules from which application is build. In the fourth chapter there is described how to install and configure the application on the GNU/Linuw operating system. The penultimate chapter is written as a user manual and acquaints reader with application control. In the last section there are results obtained in testing the application presented and commented.
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Turbo-convolution and turbo-block codes
Šedý, Jakub ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
The aim is to explain the Turbo convolutional and block turbo codes and decoding the secure message. The practical part focuses on the design of a demonstration program in Matlab. The work is divided into four parts. The first two deal with theoretical analysis of coding and decoding. The third section contains a description created a demonstration program that allows you to navigate the process of encoding and decoding. The fourth is devoted to simulation and performance of turbo codes.
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Echo suppressor according to G.168 recommendation
Lajtkep, Tomáš ; Krajsa, Ondřej (referee) ; Sysel, Petr (advisor)
This master’s thesis deals with conditions and procedures of testing network echo cancellers according to recommendation ITU-T G.168. The point of it’s interest is design of test application which will perform the objective testing their basic and extended features in MATLAB. Theoretical section is concentrated on declaration the ground of echo cancellers and conditions of their testing. Procedures of particular tests follow in next part. The last section designs the testing function which results in entire application which tests submitted canceller and in chosen file write out the report and is also able to display results like graph.
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Power line parameters
Kavan, Pavel ; Krajsa, Ondřej (referee) ; Mlýnek, Petr (advisor)
At the beginning is diploma thesis focused on a distribute power line parameters measurement and examination changes of this parameters depending on using of various power line cables. On the basis of measurements is made a transmission channel in Matlab & Simulink, where are executed simulations with power transmission line. The simulated power line is based on measured distribute parameters or physical proportions of cabels. By changing different parts of simulated communication channel is a symbol error rate expressed on the lenght of transmission line.
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Measuring device connected over USB
Flek, Tomáš ; Strašil, Ivo (referee) ; Krajsa, Ondřej (advisor)
In essence, this master’s thesis focuses on search and project on optimal electrical scheme, which will substitute for digital oscilloscope function. The thesis consist of three parts, first part is about problems associated with oscilloscope signal sampling and data bus descriptions, second part where are selected particular circuits, electrical scheme, eventually shown different options which could be used. Third part consists of software function description developed for controlling microprocessor. In choosing of analog devices, are focused on parameters like maximal input voltage on which the device has most ideal parameters, but also parameters, which are critical for particular block, like for example input impedance, device noise, operating amplifier input voltage and current offset. All devices were chosen with battery supply possibility, so what the lowest possible power consumption. In this thesis is theoretically described each circuit block and reasons for their selection.
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Head Pose Estimation and Tracking
Pospíšil, Aleš ; Krajsa, Ondřej (referee) ; Přinosil, Jiří (advisor)
Diplomová práce je zaměřena na problematiku detekce a sledování polohy hlavy v obraze jako jednu s možností jak zlepšit možnosti interakce mezi počítačem a člověkem. Hlavním přínosem diplomové práce je využití inovativních hardwarových a softwarových technologií jakými jsou Microsoft Kinect, Point Cloud Library a CImg Library. Na úvod je představeno shrnutí předchozích prací na podobné téma. Následuje charakteristika a popis databáze, která byla vytvořena pro účely diplomové práce. Vyvinutý systém pro detekci a sledování polohy hlavy je založený na akvizici 3D obrazových dat a registračním algoritmu Iterative Closest Point. V závěru diplomové práce je nabídnuto hodnocení vzniklého systému a jsou navrženy možnosti jeho budoucího zlepšení.
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Vehicle detection in images
Pálka, Zbyněk ; Přinosil, Jiří (referee) ; Krajsa, Ondřej (advisor)
This thesis dissert on traffic monitoring. There are couple of different methods of background extraction and four methods vehicle detection described here. Furthermore there is one method that describes vehicle counting. All of these methods was realized in Matlab where was created graphical user interface. One whole chapter is dedicated to process of practical realization. All methods are compared by set of testing videos. These videos are resulting in statistics which diagnoses about efficiency of single one method.
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