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Protection of data transmission against long error bursts
Malach, Roman ; Lambertová, Petra (referee) ; Němec, Karel (advisor)
This Master´s thesis discuses the protection of data transmission against long error bursts. The data is transmited throught the channel with defined error rate. Parameters of the channel are error-free interval 2000 bits and length of burst error 250 bits. One of the aims of this work is to make a set of possible methods for the realization of a system for data correction. The basic selection is made from most known codes. These codes are divided into several categories and then the best one is chosen for higher selection. Of course interleaving is used too. Only one code from each category can pass on to the higher level of the best code selection. At the end the codes are compared and the best three are simulated using the Matlab program to check correct function. From these three options, one is chosen as optimal regarding practical realization. Two options exist, hardware or software realization. The second one would seem more useful. The real codec is created in validator language C. Nowadays, considering language C and from a computer architecture point of view the 8 bits size of element unit is convenient. That´s why the code RS(255, 191), which works with 8 bits symbols, is optimal. In the next step the codec of this code is created containing the coder and decoder of the code above. The simulation of error channel is ensured by last program. Finally the results are presented using several examples.
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Optimization of data communication over high-voltage lines
Minárik, Peter ; Krajsa, Ondřej (referee) ; Mlýnek, Petr (advisor)
The thesis deals with analysis of the PLC (Power Line Communication) system for data communications through powerlines. In the introduction describes the technology of data transmission through the energy network and is divided into categories corresponding with the explanation of the various specifications and features. Different types of coding, affecting the transmitted signal interference and modulation techniques used in a PLC are also described. The practical part is made up of telecommunications network model with transmission channel realized as additive white noise. The model can setup different types of modulation and coding in relate with the signal to noise ratio and bit error rates. The individual blocks settings are described in detail. The model was simulated. The results of simulation are displayed and evaluated at the end of work.
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On Board Diagnostics
Račanský, David ; Šebesta, Jiří (referee) ; Dřínovský, Jiří (advisor)
This bachelor thesis deals with design of a simple diagnostic board computer of a car. The solution is divided into 2 parts. The first part is focused on the hardware implementation, which is based on the use of integrated circuit ELM323. This circuit contains 6 basic communication protocols for diagnostic purposes. Communication here has been modified from the original version of RS232 on USB with the help of FTDI. The proposed software solution was realized in C++ Builder 6.0 programming tool. It contains 9 modes, which include all types of vehicles subject to the ISO 9141 and ISO 14230 communication standards for automotive diagnostics. It can detect the type of defect, if defined and listed in the relevant table. Storage and retrieval of gained data are obvious.
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Remote-controlled switching of information systems - part II
Prečan, David ; Kapoun, Vladimír (referee) ; Herman, Ivo (advisor)
This bachelor´s thesis deals with remote communication over Ethernet interface. First, a brief survey of the existing solutions is presented. Then a remote temperature measurement using data transmission over Ethernet network is proposed. The proposed solution is described in detail including hardware and software design of an equipment for data transmission and evaluation that is based on ATmega 162/30 processor. This equipment communicates with a PC where the measured temperature is displayed. A functional sample of this equipment, which was used to verify the design, is described.
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Secured data transfer between client and server using hessian protocol
Hořejš, Jan ; Uher, Václav (referee) ; Burget, Radim (advisor)
The objective of this work was the choice and creating of a secure communication protocols between server and a client in order to transmit sensitive medical data through an unsecured network. The first part is focused on a theoretical description and the properties of both client and server applications, metaprotocols, their purpose and thein appropriate use. The second part describes creation of secure communication and creation of demonstration application for secure data transmission. It is demonstrated by setting the server, creation of client applications and compilation of the certificate, including its installation.
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Software for assuming control over the computer
Kostelník, Jan ; Kouřil, Jiří (referee) ; Polívka, Michal (advisor)
The introduction of this Master’s thesis describes a historical and technological evolution of the terminal application, including its advantages and disadvantages. In the following part, a general description of the services and their understanding are mentioned. The benefits and general advantages of the terminal services are described. For the each type of the terminal service, all the functions, options, exact advantages and disadvantages are described. Consequently, the study of the suitability of the compression is presented. On the demo application, the impact of an excessive (voluntary) loss of information is demonstrated. In the next part, the thesis deals with the most frequently used remote-control applications. The tests and comparisons are made as well. The fifth chapter is the fundamental part of this work. The design approach of the workbench is presented there. Consequently, the design approach and system implementation intended for the supervision and control is described. This system makes the user possible to observe other user’s activities and also to control their workstations. The supervising user can also access their drives and other memory devices, which are located in the monitored workstation. The communication is compressed and encrypted. The symmetric and asymmetric encryption algorithms are used there. In the following part, there are two supplementary applications mentioned – application for the key generating and network file manager. In the end of my work, the results of the performance test and also the design of other improvements are presented.
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Error protection of data transmission using BCH Codes
Kašpar, Jaroslav ; Křivánek, Vítězslav (referee) ; Němec, Karel (advisor)
The thesis Data transmission error-protection with BCH codes deals with a large class of random-error correcting cyclic codes which are able to protect binary data and can be used for example in data storages, high speed modems. Bose, Chaudhuri and Hocquenghem (BCH) codes operate over algebraic structures called Galois fields. The BCH encoding is the same as cyclic encoding and can be done with linear feedback shift register but decoding is more complex and can be done with different algorithms - in this thesis there are two algorithms for decoding Peterson and Berlekam-Massey mentioned. The aim of this thesis is to find BCH code which is able to correct t = 6 independent errors in up to data sequence n = 150 bits, then peruse possible realizations of the codecs and set criteria for the best realization, then design and test this realization. This thesis is split into three main parts. In the first part there are encoding and decoding methods of the BCH code generally described. The second part deals with selecting of the right code and realization. There was chosen BCH (63,30) code and realization with FPGA chip. In the last part is described design of BCH encoder and decoder and compilation in the Altera design software.
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Energy Aware Data Processing on Wireless Sensor Nodes
Červenka, Vladimír ; Zdrálek, Jaroslav (referee) ; Vaněk, Tomáš (referee) ; Komosný, Dan (advisor)
This thesis focuses on energy efficiency of particular aspects of data processing on wireless sensor nodes and deals with methods aiming to decrease energy consumption of wireless sensor network (WSN) applications requiring high processing power. The work presents comprehensive analysis of mesh protocols and available hardware platforms in terms of energy efficiency. A new energy efficient sensor node with high processing capability is presented and utilized to evaluate the proposed system for autonomous data transmission in WSN. Finally, an implementation of real-time operation system supporting mesh communication and very strict energy requirements through energy profiles is also presented. A valuable finding is that further increase of energy efficiency is only possible through a holistic approach in software and hardware architecture design, so that hardware and software/ firmware are tightly coupled. The output of this research might be applied in industry or academy field without necessity of any change or prior knowledge of WSN. The autonomous system of data transmission opens new research possibilities to decrease energy requirements of WNS.
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Data buses in the automotive industry
Plíšek, Marek ; Míša, Jiří (referee) ; Zháňal, Lubor (advisor)
The topic of the bachelor thesis is data buses in cars. The aim of the work is to describe data buses and compare their key properties and functional parameters. Sources for bus comparison are drawn from domestic and foreign sources. The work brings a complete comparison of all commonly used data buses: CAN, LIN, FlexRay, MOST, Ethernet. The output of the analysis is a clear table of properties and parameters of buses with a description of their advantages and disadvantages. The work is supplemented by a reflection on the future development of communication systems in cars.
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Wireless data collection form engine control units
Procházka, Miroslav ; Kejík, Petr (referee) ; Prokopec, Jan (advisor)
This thesis deals with implementation of a wireless interface for a module providing communication between computer and electronic control unit of an automobile. The 802.11 standard, wireless network structures and MAC sublayer were described. The thesis suggests selection of the most suitable WLAN module, testing of module's features used and the WLAN module implementation. Modifications for the next device version were developed and programs for device operation were implemented.
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