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Microwave Modulators Based on Sixports
Dušek, Martin ; Bezoušek, Pavel (referee) ; Galajda, Pavol (referee) ; Šebesta, Jiří (advisor)
This doctoral thesis is focused on problems of modulators based on six-ports. It begins with description of current state of the art of six-ports used like modulators, their transfer functions and SIW technology. A design part of this thesis consists from experimental six-port based on substrate integrated waveguide (SIW) technology. There is presented step-by-step development of this six-port using this technology and also there is introduced micro-strip technology based six-port. Final design of six-ports and variable impedances were measured, the results are discussed and compared with expected ones in next chapters. Second part of this thesis deals with influences of internal parameters of six-ports to final signal transmission and derives theirs transfer functions for more than one reflection in structure. The computation results are compared with experimental measurements for fixed loads. With using of ideal loads sweeps, modulations with shaped input signals were calculated. For designed variables impedances, there was founded the optimal biasing points for demanded IQ diagram and discussed which from tested active circuit is suitable. In the last part there are shown results of experiment with these variable loads connected to both types of designed six-ports.
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Transmission of Digital Information over Audio
Bujnovský, Michael ; Malenovský, Vladimír (referee) ; Černocký, Jan (advisor)
Cílem této práce je umožnit přenést binární informace mezi dvěma zařízeními jen za pomocí zvuku. Práce začíná analýzou existujících řešení. Dále popisuje různé techniky digitální modulace, věnuje se synchronizaci a vlastnímu protokolu zapouzdřující data. Velkou částí práce jsou testy úspěšnosti přenosu za užití různých nastavení frekvencí a prostředí. Na základě výsledků testů je implementovaná uživatelská aplikace, umožňující demonstraci systému.
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Transmission of Digital Information over Audio
Bujnovský, Michael ; Malenovský, Vladimír (referee) ; Černocký, Jan (advisor)
Cílem této práce je umožnit přenést binární informace mezi dvěma zařízeními jen za pomocí zvuku. Práce začíná analýzou existujících řešení. Dále popisuje různé techniky digitální modulace, věnuje se synchronizaci a vlastnímu protokolu zapouzdřující data. Velkou částí práce jsou testy úspěšnosti přenosu za užití různých nastavení frekvencí a prostředí. Na základě výsledků testů je implementovaná uživatelská aplikace, umožňující demonstraci systému.
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DOCSIS Technology in Access Networks
Pirohanič, Lukáš ; Šilhavý, Pavel (referee) ; Horváth, Tomáš (advisor)
This bachelor thesis explains the design and implementation of data communication between a central unit and a cable modem. Suitable transfer medium and intermediate devices for signal forking and amplification are chosen in practical part of the work. The upstream and downstream channel transfer rates are tested using modulation techniques and also testing the DOCSIS Network for qualitative parameters and laboratory task dealing with the DOCSIS standard. The theoretical part describes DOCSIS standard, CATV network architecture and signal modulation during transmission.
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Microwave Modulators Based on Sixports
Dušek, Martin ; Bezoušek, Pavel (referee) ; Galajda, Pavol (referee) ; Šebesta, Jiří (advisor)
This doctoral thesis is focused on problems of modulators based on six-ports. It begins with description of current state of the art of six-ports used like modulators, their transfer functions and SIW technology. A design part of this thesis consists from experimental six-port based on substrate integrated waveguide (SIW) technology. There is presented step-by-step development of this six-port using this technology and also there is introduced micro-strip technology based six-port. Final design of six-ports and variable impedances were measured, the results are discussed and compared with expected ones in next chapters. Second part of this thesis deals with influences of internal parameters of six-ports to final signal transmission and derives theirs transfer functions for more than one reflection in structure. The computation results are compared with experimental measurements for fixed loads. With using of ideal loads sweeps, modulations with shaped input signals were calculated. For designed variables impedances, there was founded the optimal biasing points for demanded IQ diagram and discussed which from tested active circuit is suitable. In the last part there are shown results of experiment with these variable loads connected to both types of designed six-ports.
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Analysis of Converged Networks by Simulations
Gardáš, Vít ; Novotný, Bohumil (referee) ; Škorpil, Vladislav (advisor)
The primary purpose of this study is to analyze converged high-speed networks with the usage of Matlab and Simuling. To set problematic area in the field of high-speed networks and solve this problem by creating a model of measurement and simulation of this model. A laboratory exercise is afterwards created on the specific problem.
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Telecommunication Education Environment and its Optimal Usage
Al Salman, Ahmed Nasser M ; Vychodil, Petr (referee) ; Škorpil, Vladislav (advisor)
Students in introductory communication theory classes can benefit from a well-planned laboratory component. Such that TIMS lap equipments which can handle a wide variety of experiments ranging from analog baseband to pass-band digital communications. These papers describe three advanced laboratory tasks with their optimized manuals designed by Al Salman Ahmed at Brno University of technology. Two are based on the simulation software TutorTIMS to implement Eye patterns, Signal Constellations, and the third is based on the Biskit hardware to implement Quadrature phase shift keying (QPSK).
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Signal Processing in Flarion System
Szajkó, Juraj ; Kejík, Petr (referee) ; Hanus, Stanislav (advisor)
Cílem bakalářské práce Zpracování signálů v systému Flarion bylo prostudovat způsoby zpracování signálu ve fyzické vrstvě a architekturu sítě Flarion. Na základě získaných poznatků při studiu fyzické vrstvy bylo za úkolem sestavit v prostředí Matlab model systému a simulace BER v závislosti na poměr vysílaného výkonu a výkonu rušivého signálu. V první části práce je detailní popis fyzické vrstvy Flarionu, probrána je baseband a OFDM modulace, LDPC kódování a frekvenční skákání. V druhém části práce je prostudována architektura sítě, ekvalizace, řízení výkonu, radiových zdrojů, a způsob handoffu. Ve třetí části práce je vytvoření downlink a uplink modelu v Matlab, dále je provedena simulace BER v závislosti na poměr vysílaného výkonu a výkonu rušivého signálu.
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Modulator and demodulator for microwave link
Martinec, Matěj ; Frydrych, Jiří (referee) ; Záplata, Filip (advisor)
This work is dealing with the design of intermediate part of transmitter and reciever that use digital BPSK and QPSK modulations for microwave link that works in 24 – 26 GHz bands. Besides choosing the suitable modulator and demodulator there was need to provide proper connection of this part with transceiver Nortel CTR26-01M. Input and output of this intermediate part was take out to baseband, where was need to ensure the transfer of diferential inputs of modulator and demodulator to symetric leading for reason of data communication with PC, for which was created the algorithms to provide transmitting and receiving data. Complete structure controlled by the microcontroller has been enliven and furthemore there was created the measurement of chosen parameteres.
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