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ISM band wireless transmission
Juráň, Jeroným ; Nešpor, Dušan (referee) ; Friedl, Martin (advisor)
This document summarizes the basic possibilities of communication using ISM bands. It also includes extracts from the ČTÚ regulation concerning usage of ISM bands. The theoretical part describes mainly the functions of chosen transmitter and receiver module. Secondly it describes the design and realization of transmitter and receiver devices including the C libraries for basic use, usable distance measurement and example application using developed devices.
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Receiving RTTY decoder
Šuňal, Štefan ; Caha, Tomáš (referee) ; Lattenberg, Ivo (advisor)
This thesis deals with designing and implementing autonomous decoder for RTTY communication. Theoretical part of the thesis deals with researching the RTTY technology and FSK modulation, which it uses, focusing mainly on the methods of demodulation. Next part of the thesis compares suitability of available platforms. Practical part of the thesis describes the design and implementation of circuit board, firmware and computer application. The device is using STM32 microcontroller. Firmware was developed in C++ using Arduino. The computer application was created by using C\# and WPF. 3 methods of FSK demodulations were implmented. One is using a FFT algorithm. Other two calculate frequency based on the period of square signal.
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Speed Measurement Using Radar
Martinů, Lukáš ; Široký, Vít (referee) ; Maršík, Lukáš (advisor)
Bachelor's thesis is focused on method of object's speed detection using a low-cost continuous wave radar module. In the first section, it describes differences between basic types of radar modules and their fundamental principles. The main part of thesis is dedicated to signal processing of radar modules K-MC1, K-MC4, that contents data to analyze moving objects. Doppler effect is used to determine the object's relative speed. Moreover, there is used FSK technique to measure the distance and there are solved issues associated with cosine factor. To verify the performance and stability, the application is tested on a several appropriate objects. In the end, the implemented application is evaluated and the possible continuation of this work is stated.
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Analysis of digital modulation robustness at various types of interference
Uher, Tomáš ; Šilhavý, Pavel (referee) ; Kubánková, Anna (advisor)
This bachelor thesis concisely describes essential type of modulation technique for transmission of binary signal. In first part there are summarized advantages and disadvantages for each described modulation technique. There are described proceeding of modulation and demodulation too. Selected digital modulations are tested for Gaussian, Rice and Rayleigh transmission channels. In final part there are compared theoretical and measured values and summarized analysis.
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FSK modem with AX.25 protocol
Vojtek, Michal ; Šebesta, Jan (referee) ; Fuchs, Michal (advisor)
The purpose of this thesis is to design FSK modem for Packet communication. In accordance with accessible literature was constructed functioning circuit schema and subsequently there was constructed a motherboard which is mainly assembled from SMD technology. It makes this modem mobile and very easy usable in terrain. Modem communicates with PC via USB bus. Also this bus is used as power source for this device. Communication between modem and PC is realized by KISS protocol and connection with tranciever is realized by AX.25 protocol.
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Model of communication system with the PLC channel
Kovařík, Tomáš ; Krajsa, Ondřej (referee) ; Mlýnek, Petr (advisor)
The aim of this work was to develop a model of a communication system with the PLC channel. The model contains different types of modulations with the possibility of their settings. The impact of a disturbance on different numbers of states QAM modulation has been evaluated. The theoretical part describes the PLC technology with its functions and the most widely used narrowband modulation.
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Design of new laboratory exercises in the course Access and transport networks
Ťupa, Martin ; Kyselák, Martin (referee) ; Škorpil, Vladislav (advisor)
In my final project there are proposed two new laboratory tasks for the subject Access and transport network. These tasks are focused on the problem of shift keyings. There are a lot of types of shift keyings, however, I directed my attention at the following ones – the Amplitude shift keying ASK, the Frequency shift keying FSK and the Phase shift keying PSK. I used TutorTIMS training system for measurement and observation. The aim of my final work is to collect both practical and theoretical information based on the shift keyings and help the Access and transport network students in the future.
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The Influence of Modulations in optical networks based on OTDM
Kočí, Lukáš ; Šifta, Radim (referee) ; Münster, Petr (advisor)
The bachelor thesis inquires into influence of modulations to transfer in optical nets, with the 320 Gbit/s zone width, based on the OTDM principle. There are also explained effects impacting on the signal transfer by optical fiber, single-mode and multi-mode op- tical fibers are described here and also principles of used technologies of multiplexing are explained. There is compiled the proposal of transmission system, which is subsequently simulated in the OptSim programme. On the initial simulation model there are the mo- dulation formats tested progressively, patterned on theoretic knowledges and its influence on the transmission quality is evaluated.
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Receiving RTTY decoder
Šuňal, Štefan ; Caha, Tomáš (referee) ; Lattenberg, Ivo (advisor)
This thesis deals with designing and implementing autonomous decoder for RTTY communication. Theoretical part of the thesis deals with researching the RTTY technology and FSK modulation, which it uses, focusing mainly on the methods of demodulation. Next part of the thesis compares suitability of available platforms. Practical part of the thesis describes the design and implementation of circuit board, firmware and computer application. The device is using STM32 microcontroller. Firmware was developed in C++ using Arduino. The computer application was created by using C\# and WPF. 3 methods of FSK demodulations were implmented. One is using a FFT algorithm. Other two calculate frequency based on the period of square signal.
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Analysis of digital modulation robustness at various types of interference
Uher, Tomáš ; Šilhavý, Pavel (referee) ; Kubánková, Anna (advisor)
This bachelor thesis concisely describes essential type of modulation technique for transmission of binary signal. In first part there are summarized advantages and disadvantages for each described modulation technique. There are described proceeding of modulation and demodulation too. Selected digital modulations are tested for Gaussian, Rice and Rayleigh transmission channels. In final part there are compared theoretical and measured values and summarized analysis.
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