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The following topics are dealt with: electronic circuits; head position monitoring; CDMA transmission system; fading channel; power line communication; local area networks; radar; inductors; switch mode power supplies; electric motors; channel estimation; OFDM system; telecommunication security; VHDL; signal processing; broadcasting; antennas; TCP; radio networks; steganography; telecommunication...
The image and video sensing and processing systems are of high importance nowadays. The crucial parameter is image quality as a part of QoS or more recently QoE (Quality of Experience) as a subjective impact (perception). This invited paper deals with various qualitative aspects in imaging systems. The first part is devoted to the modeling of HVS and image quality evaluation. A model for prediction...
Paper deals with complex solutions of radio communication systems for special application especially in air traffic control ATC and integrated rescue systems IRS area. Basic customer demands for such applications are briefly described and discussed from point of view of multi band antenna systems and SW transceivers. The architecture design of an ATC and an IRS system is demonstrated including remote...
CERN - the European Organization for Nuclear Research - is the largest particle physics laboratory and one of the world's most respected scientific institutes. Currently it operates ten particle accelerators, a new linear injector for H- acceleration is under construction and two future machines are in the study and research phase. Radio frequency systems are a vital part of almost all particle accelerators...
The paper compares two basic approaches how to determine sensitivities of voltages and/or currents along multiconductor transmission lines (MTL). First continuous models are formulated in the (s,x) and (s,q) domains via one and two-dimensional Laplace transforms, respectively. Second a semidiscrete model is presented, based on the connection of generalized Pi sections in cascade while processing its...
The automatic head position monitoring system is designed for monitoring patient head after special ophthalmological operation called Vitrectomy. In the final phase of this operation a small amount of vitreous is replaced with a bubble of expansive gas or oil to push on recovering parts of the retina. Correct position of the head during recovery time is therefore important. The presented device provides...
The study in this paper underlines the importance of correct joint selection of the spreading codes at the transmitter side and detector at the receiver side in the uplink multi-carrier code division multiple access transmission system model (MC-CDMA) in the presence of frequency selective fading environment and nonlinear distortion due to high power amplifier (HPA). For the precise overall performance,...
Pulse generator with parameters controlled by microcontroller is described. All the timing circuits are included in a microcontroller, which is used to control the operation of the instrument. The amplitude of the output pulses is controlled using an adjustable power supply source of the generator output stage. Software is also briefly described.
Two versions of a portable AC current source with the frequency of the power network are presented. The output current is adjustable in steps from hundreds of mA up to 60 A. Fine current adjustment inside every step is also possible. The phase shift of the output current -60deg, 0deg and +60deg is selectable. Equations for the calculations of the necessary elements to set the desired phase shift have...
The paper presents novel current-mode (CM) quadrature oscillators (QOs) created using the recently proposed active building block (ABB), namely the current controlled current differencing transconductance amplifier (CCCDTA). Two circuits have been proposed and both of them employ minimum components, namely one multiple output CCCDTA (MO-CCCDTA) and two grounded capacitors. One of the proposed circuits...
This paper is focused to the investigation and analysis of harmful interference to the transfer properties and error rate in the LonWorks power line communication systems. Investigation is concerned to the interference between PLC modem and testing signals which are similar to signals produced by switched power supplies or for example fluorescent lamps. The results of a measurement of the transfer...
The goal of my paper is to analyze mutual effects of radars and wireless systems on each other. In practice it occurred in many cases that these systems interfered with each other in their normal mode of operation. I studied the problem on radars working in the L band (1- 2 GHz) and in the C band (4-8 GHz). In the first case we experienced that the radar created a notable loss in the quality of the...
An electron synchrotron is the most universally usable type of accelerator, constituting an intensive source of light with unique features. It is used for advanced experiments, thanks to which it is possible to gain unique information on behaviour of matter on molecular and atomic levels. Data provided by synchrotrons are important for the competitiveness of the future industry in the EU. They will...
This paper discusses the loss in the transformer and the inductor in applications of the DC/DC converters. The analysis of this loss due to eddy currents in windings conductor of these transformers and inductors is made. This eddy current loss is caused particularly by two effects: skin effect and proximity effect, which are also part of this text. The design optimization of these windings to minimize...
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