2004/2

 

Recent Submissions

  • On the High Altitude Platform (HAP) W-CDMA System Capacity 

    Taha-Ahmed, Bazil; Calvo-Ramon, Miguel; de Haro-Ariet, Leandro (Společnost pro radioelektronické inženýrství, 2004-06)
    The performance of a downlink power control model, based on a n-th power distance law, is evaluated for high altitude platform station (HAPS) W-CDMA systems. The downlink capacity using this model is compared with the ...

  • Modeling Broadband Microwave Structures by Artificial Neural Networks 

    Raida, Zbynek; Lukes, Zbynek; Otevrel, Viktor (Společnost pro radioelektronické inženýrství, 2004-06)
    The paper describes the exploitation of feed-forward neural networks and recurrent neural networks for replacing full-wave numerical models of microwave structures in complex microwave design tools. Building a neural model, ...

  • Nonlinear Resistor with Polynomial AV Characteristics and Its Application in Chaotic Oscillator 

    Petrzela, Jiri; Pospisil, Vaclav (Společnost pro radioelektronické inženýrství, 2004-06)
    This paper shows the realization of two terminal devices with an arbitrary polynomial nonlinearity up to the fifth order. The proposed design procedure is completely systematic using minimum of components. The very heart ...

  • Asymptotic Analysis of Optimal Piecewise Uniform Polar Quantization 

    Peric, Zoran H.; Bogosavljevic, Srdjan M. (Společnost pro radioelektronické inženýrství, 2004-06)
    In this paper, a simple and complete asymptotical analysis is given for a mean square error (MSE) piecewise uniform polar quantizer (PUPQ). We show that PUPQ has the same performance as the asymptotic nonuniform polar ...

  • Rain Intensity Statistical Processing and Comparison with ITU-R Recommendations 

    Kvicera, Vaclav; Grabner, Martin; Hlavaty, Michal (Společnost pro radioelektronické inženýrství, 2004-06)
    Rain intensities have been measured since February 1992 by means of a heated siphon raingauge. Rain intensity data gathered over 11-year period were statistically processed, cumulative distributions of rain intensities ...

  • Frequency Stability Improvement in Direct Digital Frequency Synthesis 

    Stofanik, Vladimr; Balaz, Igor (Společnost pro radioelektronické inženýrství, 2004-06)
    The paper describes a digital frequency synthesizer that incorporates a novel method of the clock signal frequency versus temperature dependency compensation. The clock signal is derived directly from a dual mode crystal ...

  • Reduction of Elastomagnetic Sensor Errors by Using Neural Networks 

    Vojtko, Jozef (Společnost pro radioelektronické inženýrství, 2004-06)
    This article deals with possibilities of reduction of elastomagnetic sensor errors. Elastomagnetic sensors are used for measuring of massive pressure force (of range about 200 kN). At the same time with demands on sensor ...

  • S-Parameter Measurements in the Time Domain 

    Tkadlec, Roman (Společnost pro radioelektronické inženýrství, 2004-06)
    The paper provides a basic overview of the theory of time-domain measurements. Results of the use time-domain techniques to obtain S-parameter are here presented. Advantages and disadvantages of this technique compared to ...