Poslední příspěvky

  • Co-channel and Adjacent Channel Interference Measurement of UMTS and GSM/EDGE Systems in 900 MHz Radio Band 

    Gleissner, F.; Hanus, S. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper is concerned with inter-system and intra-system interference measurements of 2.5G and 3G mobile communication systems. The both systems UMTS and GSM/EDGE are assumed to operate in a common radio band of 900 MHz. ...
  • Preamble Design Problematic with 802.11a IEEE Standard (Minn’s Training Sequence Approach) 

    Oni, R. R. A. (Společnost pro radioelektronické inženýrství, 2008-09)
    Generally OFDM systems use a predefined signal pattern, called preamble [2] [3], which helps the receiver to achieve a better signal detection (coarse, fine time synchronization) with the frequency offset and channel ...
  • Bistatic and Multistatic Radar Systems 

    Bezousek, P.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    Radar systems, based on bistatic radar concept attracted a substantial attention in the recent years. Passive coherent location systems using \"transmitters of opportunity\" like radio or TV broadcasters, GSM base stations, ...
  • Detection of Glaucomatous Eye via Color Fundus Images Using Fractal Dimensions 

    Kolar, R.; Jan, J. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper describes a method for glaucomatous eye detection based on fractal description, followed by classification. Two methods for fractal dimensions estimation, which give a different image/tissue description, are ...
  • DVB-T Digital Terrestrial Television Transmission over Fading Channels 

    Kratochvil, T.; Stukavec, R. (Společnost pro radioelektronické inženýrství, 2008-09)
    The paper deals with the transmission of the digital television signal according to the DVB-T standard in SFN network over fading channels for the fixed reception. The laboratory transmission system for the real broadcasting ...
  • Bluetooth and IEEE 802.11b/g Coexistence Simulation 

    Mikulka, J.; Hanus, S. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper deals with the coexistence simulation of Bluetooth and Wi-Fi physical layers. Bluetooth and Wi-Fi systems share the same ISM 2.4 GHz frequency band and therefore using both systems in the same area may cause ...
  • Interfering DC Component, Suppression and Influence to Digital Signal Processing 

    Stranak, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    The article concentrates on effects of a digitized audio signal DC component on a typical A/D converter and its influence on further signal processing. This article analyses reasons of the interfering DC component emergence ...
  • Performance of Advanced Hybrid Link Adaptation Algorithms in Mobile Radio Channel 

    Wieser, V.; Psenak, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    The fast power adaptation is essential for WCDMA based mobile radio networks, as 3G UMTS. Although the first version of UMTS has been released in 1999 (Release 99) evolution was not finished yet. Quality of Service (QoS) ...
  • Estimating PSNR in High Definition H.264/AVC Video Sequences Using Artificial Neural Networks 

    Slanina, M.; Ricny, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    The paper presents a video quality metric designed for the H.264/AVC codec. The metric operates directly on the encoded H.264/AVC bit stream, parses the encoding parameters and processes them using an artificial neural ...
  • Extraction of Facial Features from Color Images 

    Oravec, M.; Kristof, B.; Kolarik, M.; Pavlovicova, J. (Společnost pro radioelektronické inženýrství, 2008-09)
    In this paper, a method for localization and extraction of faces and characteristic facial features such as eyes, mouth and face boundaries from color image data is proposed. This approach exploits color properties of human ...
  • Joint Source-Channel CELP Coding 

    Pleshkova-Bekiarska, S. G. (Společnost pro radioelektronické inženýrství, 2008-09)
    The method of speech coding CELP is extensively used in much voice communication-, multimedia-, video conference and other systems. There are a lot of papers related to CELP coding characteristics improvement for a better ...
  • Dispersion and Pulse Interferences Investigation for UWB Signal Propagation 

    Urban, R.; Zvanovec, S. (Společnost pro radioelektronické inženýrství, 2008-09)
    The Ultra WideBand (UWB) technology utilizing nanosecond pulses has been one of the main phenomena in communications and radar applications for several years. This paper discusses the basic measurement techniques of impulse ...
  • Modeling of Microwave Semiconductor Diodes 

    Pokorny, M.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2008-09)
    The paper deals with the multi-physical mode-ling of microwave diodes. The electrostatic, drift-diffusion and thermal phenomena are considered in the physical model of the components. The basic semiconductor equati-ons are ...
  • On the Modal Superposition Lying under the MoM Matrix Equations 

    Hazdra, P.; Hamouz, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper shows an interesting sight on the correspondence between total current solution obtained by the Method of Moments and by the Characteristic modes respectively. Derivation is based on representation of a matrix ...
  • Dual-band Loop Feed with Enhanced Performance 

    Galuscak, R.; Hazdra, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper is aimed on specific problems of electrically small and deep dish parabolic antennas. Since these antennas may suffer with low efficiency authors describe design and optimization of simple dual-band loop prime-focus ...
  • Errors in Measurement of Microwave Interferograms Using Antenna Matrix 

    Zela, J.; Hoffmann, K.; Hudec, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    New antenna matrices for both scalar and vector measurement of microwave interferograms for the frequency 2.45 GHz were developed and used for an analysis of sources of measurement errors. Influence of mutual coupling ...
  • Gain Estimation of Doubly Curved Reflector Antenna 

    Pidanic, J.; Cermak, D.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    A simple formula of approximate gain estimation is verified for the doubly curved reflector antenna. Numerical simulations using physical optics and experimental results of the shaped-beam doubly curved reflector antenna ...
  • Isotropic Single Negative Metamaterials 

    Machac, J.; Protiva, P.; Rytir, M.; Blaha, M.; Zehentner, J. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper presents the application of simple, and therefore cheap, planar resonators for building 3D isotropic metamaterials. These resonators are: a broadside-coupled split ring resonator with a magnetic response providing ...
  • Conservative Chaos Generators with CCII+ Based on Mathematical Model of Nonlinear Oscillator 

    Petrzela, J.; Slezak, J. (Společnost pro radioelektronické inženýrství, 2008-09)
    In this detailed paper, several novel oscillator\'s configurations which consist only of five positive second generation current conveyors (CCII+) are presented and experimentally verified. Each network is able to generate ...
  • Potential Worst-case System for Testing EMI Filters Tested on Simple Filter Models 

    Drinovsky, J.; Svacina, J.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper deals with the approximate worst-case test method for testing the insertion loss of the EMI filters. The systems with 0.1 Ω and 100 Ω impedances are usually used for this testing. These systems are required by ...

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