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Noise Analysis of Basic Circuits for Analog Signal Processing
Humpolíková, Michaela ; Sládok, Ondřej (referee) ; Kubánek, David (advisor)
The cause of noise in analog circuits is a problem of quality in output signals. There are many reasons of its occurrence, noise is caused by components connected into the circuit, and the assembly itself. This bachelor thesis summarizes the theoretical knowledge about noise analysis. Noise measurement in circuits can now be calculated with PSpice, the results are used for the design of low noise circuits. In the contained practical analysis of the circuits were achieved the results for the suitable designing of low noise circuits.
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Implementation of cryptographic algorithms on the FPGA platform
Zugárek, Adam ; Sládok, Ondřej (referee) ; Smékal, David (advisor)
This bachelor’s thesis describes methods of data encryption and author’s own implementation on FPGA. The goal of this thesis is to implement cipher on a hardware accelerated network card COMBO. In the introduction is described encryption using block ciphers. Cipher AES was chosen to implement, which is famous and most using cipher. Its detailed description is described in the first part of the thesis. In the second part is described the author’s own implementation of AES cipher in VHDL. In the next part is method of interconnecting the resulting program with a framework of the FPGA card – NetCOPE. Achieved results are in the end of this thesis. The resulting program cannot encrypt network communication. It only transforms data stored in the card, which then send to host computer.
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Pseudo-differential frequency filters operating in current mode
Velič, Ladislav ; Bečková, Zuzana (referee) ; Sládok, Ondřej (advisor)
This bachelor thesis deals with pseudo-differential frequency filters working in current mode. This thesis further describes different types of frequency filters and their characteristics. In the thesis there are described differencies between differential, non-differential and pseudo-differential filters and their schemes. The thesis then shows schemes of pseudo-differential filters working in current mode. Pseudo-differential band-pass filter is in practical part of the thesis constructed and its practical features are compared to the theoretical.
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Topology for next generation access networks
Kovář, Adam ; Sládok, Ondřej (referee) ; Grenar, David (advisor)
This thesis consists of basic requirements, application of optical fibres and final simulation of this network in specific location. This template shows ideal construction of optical fibre network for this specific location and also displays expected price of building this kind of network. In this thesis will be described this location and its problematic parts which can have critical impact on building of this network. As a part of design of this network we chose optical fibre and technology for protection of optical fibres. All of these items are collected and we can see approximate price. This thesis shows how the customer will be connected to network and also to this thesis is attached the map which shows exact position of the network. Simulation will prove networks stability and shows delay which can occur during using basic and expected applications on network.
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Pseudo-differential fractal-order frequency filters
Alkanan, Mohamad ; Dvořák, Jan (referee) ; Sládok, Ondřej (advisor)
This bachelor´s thesis deals with pseudo-differential frequency filters of fractal order. It is a proposal of non-integer order (1 + ) of pseudo-difference filter. The introduction to the theory describes the basic properties of frequency filters, their type and use. The following is a description of pseudo-differential and differential filters. The next part of the text is devoted to filters of non-integer order. Then there is a description of the current conveyors used (UCC, DVCC and DDCC). The next part of the work is devoted to the design, which is a pseudo-differential frequency filter of fractal order (1 + ) and its subsequent mathematical description in the SNAP program. The functionality and correct behavior of the filter were verified by simulations in OrCAD. The last part of the work is devoted to the practical measurement of the filter.
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Application of simulation model of access network
Szymeczek, Andrzej ; Sládok, Ondřej (referee) ; Grenar, David (advisor)
The topic of the diploma thesis is " Application of simulation model of access network". The aim of the thesis was to create a part of the access network in which were tested simulations for TCP and UDP traffic. The theoretical part of the thesis deals with general information about the GNS3 program and the possibilities which this program allows. The next part of the thesis describes the Mikrotik RouterOS program, which was used in the topology. The next section describes the types of routing in IP networks, as well as the types of packet delivery. The practical part deals with the creation of test topologies and verification of the performance of the simulation tool. Furthermore, the practical part deals with the programming of a network generator for TCP and UDP traffic in the network. The generator was created by using a Bash script and a combination of the dd and nc commands. At the end, the thesis describes the results of simulations in terms of transmission speed, network throughput, packet size distribution and in the case of TCP also bidirectional delay – RTT.
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Utilization of open source tools for access network monitoring
Gmitter, Jakub ; Sládok, Ondřej (referee) ; Grenar, David (advisor)
The bachelor thesis deals with the issue of access network monitoring, which is necessary to ensure the stability of access networks. It contains a comparison of suitable monitoring tools for their selection. The work is focused on creating scripts in the Bash language, which analyze data on the access network and implement outputs from selected monitoring tools. In this work were analyzed the transmitted packets and the achieved transmission speeds during monitoring. The final output of this work are databases created in MySQL, which contains data about the analyzed parameters and visualization of data analysis using the Grafana program. Graphs of the transmission speeds of monitoring and basic transmission statistics were created on panels during visualization.
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Priority packet queues in FPGA
Németh, František ; Sládok, Ondřej (referee) ; Smékal, David (advisor)
Master thesis is dealing with issues and problems of packet queue management in high speed packet networks. Design implementation is made in VHDL hardware description language. In theoretical part of thesis are explained different types of mechanism used for providing quality of service in communication networks. Furthermore the brief description o VHDL, FPGA and framework Netcope Development Kit is a piece of theoretical part as well. The outcome of practical part contains a design, limiting packet queues based on Tocken Bucket mechanism. Design verification was made by simulations, synthesis and real implementation on smart NIC NFB-200G2QL. All kind of verificaion results are summerized in last three chapters.
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New laboratory exercises in OMNeT++ simulation enviroment
Petrůj, Jakub ; Sládok, Ondřej (referee) ; Langhammer, Lukáš (advisor)
This Bachelor thesis illustrates a draft and creation of two lab exercises in a network simulation environment of OMNeT++ with INET Framework extension on behalf of Communication Technologie course. Initialy, simulated environment itself is defined and, including NED language and its modules, then the process of simulation and analysis of its results are presented and discused. Further more this work describes theoretical network knowledge required to create the simulation and treat its results. The first methodical part of this work compares HTTP, FTP, Telnet and VOIP protocols in simultaneous and non simultaneous running, with increased occurance of errors on line or its complete outage. The second methodical part of this work observes dynamic network configuration using DHCP protocol more in detail. Futhermore, this part studies the question of both non-efective and efective subnetting and handles issues concerning static adressing of network.
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