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Pseudo-random sequencies in UWB systems
Laška, Richard ; Maršálek, Roman (referee) ; Prokeš, Aleš (advisor)
This master´s thesis deals with Ultra-wideband and reveals present stage of this technology and situation on marketplace. In this work I will mention the milestones of its history and describe main fundamentals of communication and modulation methods in UWB systems. This work provides an overview of methods in pseudo-noise code design. The practical part includes UWB system simulation based on BPSK modulation and Directsequence multi-access scenario. This work presents BPSK modulated signal behavior in UWB channel model, where AWGN noise and multi-path energy is taken into account. Only physical layer was tested. At the end of this thesis, the summary and conclusion simulation results will be discussed. Bit error rate characteristic is a product of this testing.
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Methods for quadrature modulator imbalance compensation
Povalač, Karel ; Valenta, Václav (referee) ; Maršálek, Roman (advisor)
Quadrature modulator (demodulator) is used in transmitting (receiving) part of many devices. Unwanted imbalance can influence amplitude, phase or DC offset of modulator (demodulator). Correction of imbalance was a main subject of thesis. Simulations of these methods were created in MATLAB and results were compared. Basics of methods were implement on programmable logic field by program Xilinx ISE. Development kit V2MB1000 with analogue board Memec P160 was chosen for this purpose. In the last part were compare simulation results with practical measurement.
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Digital predistorters for amplifier linearization
Kroužil, Miroslav ; Valenta, Václav (referee) ; Maršálek, Roman (advisor)
In this work I describe digital predistortion in baseband used for amplifier linearization. Non-linearity is one of the worst disadvantages of Power amplifiers and decreasing of its is useful from many reasons. Work examines system which contains: Data source, which is represented by QPSK or OFDM modulator, predistorter, Power amplifier (model of non-linearity) and unit used to update coeficients for predistorter adaptation. System is simulated in MATLAB and Xilinx (simulation by ModelSim). Results are compared, described and commented.
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Adaptive Control of a DC Drive
Krkoška, Roman ; Huták, Petr (referee) ; Skalický, Jiří (advisor)
The master’s thesis deals with method of adaptive control of electrical drives. It aims at control of DC motor with using self tunning controller (STC) and gain-schedulink in simulative enviroment of MATLAB. The first part of the thesis deals with of basic methods adaptive control of electrical drives and with of basic identification methods, computation of controller parameters and control laws of controllers. The second part of the thesis is aimed at applying adaptive controllers to mathematical model of controlled system. Include monitoring parameters of identification The thesis contains originate programs include source files.
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MathScript in LabVIEW
Selinger, Michal ; Keprt, Jiří (referee) ; Čejka, Miloslav (advisor)
SELINGER, M. MathScript in LabVIEW. Brno: Brno University of Technology, The Faculty of Electrical Engineering and Communication, 2008. 92 pages. Supervisor Ing. Miloslav Čejka, CSc. The main goal of this Thesis is to examine the portability of the m-scripts between The National Instruments LabVIEW MathScript and The MathWorks MATLAB development programs. The Thesis deals with function differences execution speeds and giving overview of using The National Instruments LabVIEW MathScript programme.
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Wavelet analysis and enhancement of MR tomography and ultrasound images
Matoušek, Luděk ; Bartušek, Karel (referee) ; Smékal, Zdeněk (advisor)
Tomographic MR (Magnetic Resonance) and sonographic biosignal processing are important non-invasive diagnostic methods used in a medicine. A noise added into processed data by an amplifier of tomograph receiving part and by circuits of sonograph is resulting in a body organ diagnosis degradation. Image data are stored in a standardized DICOM medical file format. Methods using wavelet analysis for noise suppression in image data have been designed and their comparation with classical methods has been made in this work. The MATLAB was utilized for data processing and data rewriting back to the DICOM format.
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Analysis of Heart Rate Variability
Škrtel, Karol ; Kolářová, Jana (referee) ; Provazník, Ivo (advisor)
The project describes the methods useful for observe changes of heart rate in ECG signal. Heart rate variability become (HRV) the conventionally accepted term to describe variations of NN intervals between consecutive heart beats and generally it is function of instantaneous heart rate or NN interval on time. HRV may be evaluated by time domain or frequency domain measures. In Matlab was developed algorithm, realized like function, which counts HRV parameters from ECG signal series. Analysis in time domain adverts to high correlation between statistic and geometric parameters and similarly with signal HRV. Results of frequency domain analysis shows similarity of power spectral density, which was calculated by two different ways (from interpolated and no interpolated signal HRV). Functionality of developed algorithm was verified on each signal. Project results have signification in progress of analysis ECG signal methods with a view to observe pathological changes in heart rate.
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FIELD II - modelling of the ultrasound field
Štrbík, Jiří ; Čížek, Martin (referee) ; Kolář, Radim (advisor)
This bachelor thesis presents the way of modelling the ultrasonic field with FIELD II package implemented in MATLAB 7 enterprise. The first part of the thesis provides the theoretical information about supersound. It describes the main properties of supersound and the processes that composse ultrasonic pulse. The principle and the significance of Doppler effect is also cleared up in this section. Finally, this part deals with ultrasonic probes, with their subdivision and their main parameters. In the second part of the thesis the FIELD II package is described. This part provides the information on the installation of the package and about the usage of the functions for modelling the ultrasonic field. This part also shows examples that illustrate the utilization of the package for teaching purposes.
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Sensitivity analysis in distributed-parameter systems
Kapusta, Ján ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
The aim of this bachelor’s thesis was to familiarize with calculation of modified nodal analysis and its application in distributed-parameter systems. Realize evaluation of sensitivities with respect to a primary parameters R0,L0,C0,G0 and length l of transmission line. Then apply this technique on example in Matlab language using graphical user interface GUIDE. Selected technique is accelerated method based on efficient computation of matrix exponential function. The results are sensitivities of circuit values with respect to a primary parameters R0,L0,C0,G0 and length l of transmission line.
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Electromyography, measurement of muscle electric activity
Kořínek, Peter ; Provazník, Ivo (referee) ; Kolářová, Jana (advisor)
The task of this thesis was to become acquainted with the issue of measuring of muscle electric activity.In the theoretical part we became familiar with the computer measuringsystem BIOPAC and its options to measure monitored magnitudes. This continue with practical part, in which we watch the problematic according to a theory in a group of people. We learned data with BIOPAC according to protocol of the result of physicaleffort influence on EMG. In the end the results were statistically analysed. The data as a product offallowing research were verified by hypothesis. In thelast step, the data are presented in graphical user interface development environment. After loading of the EMG of measured person, the process are displayed-without, with and after the power with onus. It is possible to choose from different analyses.
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