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SFN and MFN networks design in DVB-T
Dostal, Radek ; Láčík, Jaroslav (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor’s thesis is focused on SFN (Single Frequency Network) and MFN (Multi Frequency Network) networks design in digital television broadcasting based on DVB-T standard. First part of the thesis is focused on the theoretical description of the MPEG-2 transport stream and basic parameters of broadcasting network, transmitters and transmission path. In practical part are introduced basic parameters of a software package for broadcast network design in RadioLab, RadioBase and Sítě SFN, and results displayed on the digital terrain map and morphologic map. Within solution of this thesis was created signal coverage model of digital transmitters in entire area of Czech Republic, so called networks no.1-4, according to its status in spring 2008. Next is focused on government order about convert from analog to digital video broadcasting terrestrial.
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Origin And Elimination Of Interference Resulting In Coexistence Of Lte, Dvb-T And Sdars
Novotny, Bohumil
The article deals with emergency of interference on newly licensed frequencies for communication in NGA 4G LTE networks, which are the source of interference with radio and television broadcasters and serves to raise awareness about the problem of interference in access networks. The article deals with the sources of interference to the licensed bands, their origins and finally provides theoretical and applied possibilities of technical solutions interference between licensed bands.
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Quality Of Service In Digital Video Broadcasting In Czech Republic
Kufa, Jan
The aim of this paper is to explore the quality of services in Digital Video Broadcasting (DVB). This work is focused on long-term measurement of individual DVB standards. Program ČT 24 is selected for more detailed analysis. There is monitored bitrate and video quality on this program. Measurement is made on the DVB-T/S/S2 standards. The study of quality in DVB systems, which are available in the Czech Republic until 1. March 2017, was the motivation for this research. After this date broadcasting will start in DVB-T2.
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Synchronized recording of sound track and hidden captions
Karas, Pavel ; Člupek, Vlastimil (referee) ; Sysel, Petr (advisor)
In my bachelor thesis I synchronized the records audio and closed captioning. This work contains the basic theory on this topic. The theory focuses on means of depositing and synchronize subtitles with the audio track. Describes the main characteristics DVB-T, technology description and multiplexes in the Czech Republic. It also describes the basic characteristics subtitles, DVD-Video and broadcast webcast. In the second part of my thesis is to study the methods of transmission captions and system design in C.
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Quality measurement of analog and digital terrestrial television broadcasting
Zach, Ondřej ; Polák, Ladislav (referee) ; Slanina, Martin (advisor)
This bachelor‘s thesis deals with the description of basic features of the analog and digital television broadcasting and suggestion of a method for objective video quality evaluation at both broadcasting types. The base of this thesis is description of picture broadcast technology in analog and digital form. Also principles of some video quality evaluation metrics are described. In this thesis, a method for video quality comparison is suggested, including a verifying of this method. According to this method, sequences at changing broadcasting conditions were recorded for both broadcasting types. The quality factors of these sequences were computed and on the basis of these factors, the analog and digital TV broadcasting were compared.
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Measurement of DVB-T transmission over simulated fading channel
Vašut, Jakub ; Kratochvíl, Tomáš (referee) ; Štukavec, Radim (advisor)
The goal of this bachelor’s thesis is to study basic functional elements of coder and modulator of standart DVB-T. Another goal is to study documentation of DVB-T modulator DTA-110T and ASI/SDI adapter DTA-145 by DekTec. Also is described software channel simulator DTC-305 and parameter settings of simulated fading channel. Fading channels are measured and assigned their effect on quality of received DVB-T signal.
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Analysis and Simulation of the Signals Transmission in the DVB-H/SH Standards
Polák, Ladislav ; Rupp, Markus (referee) ; Grgic, Songa (referee) ; Kratochvíl, Tomáš (advisor)
Tato disertační práce se zabývá analýzou, simulací a měřením zpracování a přenosu signálů digitální televize pro příjem mobilního TV vysílání ve standardech DVB-H a DVB-SH. Tyto standardy vycházejí z předpokladu, že příjem signálu je charakterizován modely přenosových kanálů s vícecestným šířením. Tyto, tzv. únikové kanály, jsou charakterizovány hlavně zpožděním a ziskem jednotlivých cest. V závislosti na dalších parametrech (rychlost přijímače, Dopplerovské spektrum), je možné rozdělit únikové kanály do třech hlavních skupin: mobilní, přenosné a fixní. Dá se předpokládat, že v různých modelech kanálů bude přenášený signál různě ovlivněn. Proto je potřebné najít optimální parametry systémů (DVB-H/SH) pro kvalitní příjem vysílaných služeb mobilní televize, což je hlavním cílem této disertační práci. Pro tento účel byly vytvořeny dvě vhodné aplikace (jedna pro DVB-H a jedna pro DVB-SH) s GUI v prostředí MATLAB, které umožňují simulovat a analyzovat míru zkreslení signálu v případě mobilních, přenosných a fixních scénářů přenosu. Navíc, tyto aplikace obsahují i druhý samostatný simulátor pro nastavení a modifikaci parametrů jednotlivých přenosových cest. Díky tomu je možné zhodnotit vliv parametrů celého systému a kanálových modelů na dosaženou chybovost (BER a MER) a kvalitu přenosu. Ve všech přenosových scénářích (v závislosti na poměru C/N) byly získané, vyhodnocené a diskutované zkreslení signálů. Navíc, u standardu DVB-H, všechny získané výsledky ze simulací byly ověřeny měřením. Rozdíly mezi dosaženými výsledky (simulace a měření) byly rovněž podrobeny diskuzi. Tuto disertační práci je možné rozdělit do čtyř hlavních částí. První část disertační práce se zabývá rešerší současného vývoje v oblasti digitálního televizního vysílání na mobilní terminály ve standardech DVB-H/SH. Na konci této části jsou jasně popsány cíle této disertační práce. Druhá část práce je zaměřená na stručný popis blokového diagramu vysílačů v obou standardech DVB-H/SH. Dále jsou stručně popsány modely přenosových kanálů, které se používají pro modelování přenosu signálu. Stručný popis vytvořených aplikací, i s vývojovým diagramem, které jsou vhodné pro simulaci a analýzu přenosu v DVB-H/SH, jsou popsány v třetí části práce. Čtvrtá a nejdelší část této disertační práce se zabývá vyhodnocením získaných výsledků ze simulací a měření.
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Measurement of DVB-T set top boxes selected parameters
Hrazděra, Tomáš ; Kratochvíl, Tomáš (referee) ; Štukavec, Radim (advisor)
This project treats of the system of the terrestrial digital TV broadcasting DVB-T. It explains the principles of source and channel encoding and the channel modulation. The analysis of parameters defined by the recommendation ETSI TR 101 290 for the purpose of measuring of the parameters of the digital TV broadcasting (set top boxes) is elaborated. Further it describes the functions of the set top box itself and executes the analysis of chosen receivers including the description of their typology. On its base the measurable parameters of commercially accessible receivers, which underwent the tests were chosen. The results are elaborated in the tabular and graphic forms, including the analysis of their influence on the quality of the received broadcast.
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Utilization of MHP platform in DVB-T
Janík, Lukáš ; Balík, Miroslav (referee) ; Kohoutek, Michal (advisor)
This bachelor‘s thesis solves the problem of digital television and set-top boxes, more precisely MHP platform and its use in DVB-T. In the first chapters I talk about analogue terrestrial broadcasting and necessity of transition to digital broadcasting. In addition, you can read about the necessity of the MHP platform implementation as the stable part of the DVB-T. I analyse this platform and describe the pros, cons and possibilities for its use at presen and in the future. I mention the different types of set-top boxes and their main manufacturers. I also describe an application development cycle, from writing the source code, despite testing in the development environment of IRT, respectively Osmosys, until loading to the real set-topbox. I also represent here the practical part of my bachelor‘s thesis, which was the development of chat client for the MHP platform and it allows two users to communicate in real time. This application I tested in the IRT and I uploaded it to the real set-top box. Next I analyze Java programming language, such as the appropriate development language for this platform. I mention the HAVi standard and its relevancy in usage of MHP platform.
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Coexistence Between DVB-T And LTE Services In a Shared Frequency Band And Their Measurement
Plaisner, D.
This work deals with exploring, measuring and evaluation of possible coexistence scenarios between Digital Video Broadcasting-Terrestrial (DVB-T) and Long-Term Evolution (LTE) mobile services, which can occur in a shared radio frequency (RF) bands. There are considered two different coexistence scenarios: partial overlapping and full overlapping RF spectrum. For the measuring, monitoring and evaluation of these scenarios, an appropriate laboratory workplace is proposed and realized. Experimental results show that the performance of DVB-T system is differently influenced by the interfering LTE services in considered coexistence scenario.
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