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Signal propagation in wireless communication systems IEEE 802.11
Vyčítal, Jaroslav ; Fliegel, Karel (referee) ; Polák, Ladislav (advisor)
This paper deals with the propagation of waves. Here is the wavelength distribution according to the wavelength. It focuses on the UHF and SHF band in which IEEE802.11n operates. Contains model breakdown by cell type. Describes which propagation methods are dominant in the cell type. Several propagation patterns are presented, which are then modeled in Matlab environment.The models are then compared to experimental measurements.
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Performance analysis of SFNs transmitters of DVB-T2
Bárta, Vojtěch ; Miloš, Jiří (referee) ; Polák, Ladislav (advisor)
The diploma thesis deals with the design and analysis of Single Frequency Networks (SFNs) transmitters for Digital Video Broadcasting – second generation of the Terrestrial (DVB-T2). In this thesis, the software of the Czech company CRC data is used. Main attention is focused on the SFN Networks computational system for the analysis and design od DVB-T2 SFN networks, in which a series of simulations of the transmitting Multiplex 21 (CH26) have been performed. The simulation-based results are used to identify locations with lower signal coverage or interfering sources as well as to find appropriate approaches to solve these issues. The rightness of the performed simulations is verified by field measurements in cooperation with the Czech Telecommunications Office (CTU), and finally a discussion on how to improve the performance of SFN networks follows.
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LoRa-based indoor localization
Šimka, Marek ; Staněk, Miroslav (referee) ; Polák, Ladislav (advisor)
This diploma thesis focuses on possible utilization of LoRa (Long Range) technology for indoor localization purposes. In this thesis, the starter kit SK-iM282A is used to create a LoRa-based wireless link in the 2.4 GHz ISM band. Main attention is focused on the experimental localization using the RSSI method in the various transmission environments, including a description of the localization principle, the procedure of processing the measured data and the evaluation of localized coordinates. The rightness of the proposed measurement setup and methodology is verified by extensive measurements in various environments and compared with state-of-the-art article.
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Simulation of the DVB-H and DVB-SH Transmission
Arvai, Luboš ; Ulovec, Karel (referee) ; Polák, Ladislav (advisor)
The paper deals with the channel coding and modulation in DVB-H and DVB-SH and with the simulation of the components in MATLAB. In the case of DVB-H the document also discuss the influence of different types of transmission channels on the transmission process. The first part of this work describes the channel coding and inner modulation in DVB-H and DVB-SH. The next part describes applications created in MATLAB for settings and simulation of the transmission in the standards DVB-H and DVB-SH. The last part of this document graphically presents selected results of the simulation of the transmission and discuss them.
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Audio DSP processor for laboratory measurements
Navrátil, Jiří ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor's thesis's content is designing and constructing a device for laboratory teaching in the Audio Electronics class. The audio DSP processor ADAU1701 from Analog Devices with integrated A/D and D/A converters is used. The SigmaStudio program is used to set up the processor, and communication is mediated by a programmer board connected to a computer via a USB connector.
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Microphone Cable Tester
Vanek, Pavel ; Polak, Ladislav
This work deals with the design and development of a time domain reflectometry method based handheld tester for microphone cables. The main aim of the work is to adopt a suitable measuring method for locating faults in microphone cables, develop electrical design and realize its practical implementation. Next, firmware for the microcontroller unit is also created. The measurement is based on a time-to-digital converter integrated circuit used in Light Detection and Ranging (LIDAR) applications. First experimental results confirmed the functionality of the proposed concept.
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Advanced Algorithms for Compression of Videos with Ultra High Resolution
Soukenik, Ondrej ; Polak, Ladislav ; Kufa, Jan
In this paper, attention is devoted to advanced video codecs (HEVC, VVC, VP9 and AV1) and their utilization for compression of videos with Ultra High Resolution (UHD), also marked as 4K and 8K. A Python-based program employing FFmpeg multimedia framework is created to explore compression performances of such video codecs. It allows to automate encoding process and record all important information during the video compression (e.g. the required CPU time, time consumption, RAM usage). The performance of the video compression algorithms is evaluated in terms of objective quality metrics. First experimental results show that video codecs VVC and AV1 could replace HEVC and VP9 for 4K and 8K videos in the future.
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Microphone cable tester
Vaněk, Pavel ; Kufa, Jan (referee) ; Polák, Ladislav (advisor)
This bachelor work deals with the electricial design and development of a handheld measuring device for microphone cables using time domain reflectometry method. The main aim of the work is to choose a suitable measuring method for locating faults on cables, develop electricial design and create its practical implementation. The build of firmware for the microcontroller unit is also the part of works. The measurement is based on a time-to-digital converter integrated circuit used in Light Detection and Ranging (LIDAR) applications. The designed device was completely implemented and tested by a set of practical measurements.
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