Now showing items 1-12 of 12

  • 60 GHz Band Propagation Experiments on Terrestrial Paths in Sydney and Praha 

    Timms, G.; Kvicera, V.; Grabner, M. (Společnost pro radioelektronické inženýrství, 2005-12)
    Two studies of the outdoor propagation of 60 GHz microwaves are described. The focus of this paper is the relationship between rainfall and measured attenuation of the microwave signal. Experimental data are presented and ...
  • Analysis of Propagation of Electromagnetic Waves in Atmospheric Hydrometeors on Low-Elevation Paths 

    Grabner, M.; Pechac, P.; Valtr, P. (Společnost pro radioelektronické inženýrství, 2018-04)
    Attenuation of electromagnetic waves in millimeter wave bands is analyzed by means of experimental measurement of received signal fluctuations on terrestrial radio links operating in frequency bands 58, 94 and 122 GHz. ...
  • BER and Availability Measured on FSO Link 

    Kvicala, R.; Kvicera, V.; Grabner, M.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2007-09)
    The BER and the availability belong among the basic qualitative parameters of free space optical (FSO) links. The BER parameter is usually mentioned by FSO manufacturers, but it is not defined what conditions a certain ...
  • Clear-Air Propagation Modeling using Parabolic Equation Method 

    Grabner, M.; Kvicera, V. (Společnost pro radioelektronické inženýrství, 2003-12)
    Propagation of radio waves under clear-air conditions is affected by the distribution of atmospheric refractivity between the transmitter and the receiver. The measurement of refractivity was carried out on the TV Tower ...
  • Empirical Relations for Optical Attenuation Prediction from Liquid Water Content of Fog 

    Khan, M. S.; Grabner, M.; Muhammad, S. S.; Awan, M. S.; Leitgeb, E.; Kvicera, V.; Nebuloni, R. (Společnost pro radioelektronické inženýrství, 2012-09)
    Simultaneous measurements of the liquid water content (LWC) and optical attenuation have been analyzed to predict optical attenuation caused by fog particles. Attenuation has been measured at two different wavelengths, 830 ...
  • Generator of Time Series of Rain Attenuation: Results of Parameter Extraction 

    Grabner, M.; Fiebig, U.-C.; Kvicera, V. (Společnost pro radioelektronické inženýrství, 2005-04)
    Rain attenuation has a significant impact on the availability of millimeter wave communication systems. In order to dynamically simulate such radio systems, several generators of artificial time series of rain attenuation ...
  • Measurement of the Structure Constant of Refractivity at Optical Wavelengths Using a Scintillometer 

    Grabner, M.; Kvicera, V. (Společnost pro radioelektronické inženýrství, 2012-04)
    The structure constant of the atmospheric refractive index is used for characterizing the turbulence strength and for predicting the scintillation of electromagnetic waves in atmosphere. It is measured continuously in ...
  • Precise Characterization and Multiobjective Optimization of Low Noise Amplifiers 

    Dobes, J.; Michal, J.; Popp, J.; Cerny, D.; Grabner, M.; Vejrazka, F.; Kakona, J.; Matejka, S. (Společnost pro radioelektronické inženýrství, 2015-09)
    Although practically all function blocks of the satellite navigation receivers are realized using the CMOS digital integrated circuits, it is appropriate to create a separate low noise antenna preamplifier based on a low ...
  • Propagation Characteristics and Availability Performance Assessment for Simulated Terrestrial Hybrid 850 nm/58 GHz System 

    Kvicera, V.; Grabner, M.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2010-06)
    Results of a propagation study on a free space optical link at 850 nm on a path 853 meters long and on a parallel 58 GHz radio link obtained over a 3-year period of observation are presented. The cumulative distributions ...
  • Rain Intensity Statistical Processing and Comparison with ITU-R Recommendations 

    Kvicera, V.; Grabner, M.; Hlavaty, M. (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 ...
  • Refractive Index Measurement at TV Tower Prague 

    Grabner, M.; Kvicera, V. (Společnost pro radioelektronické inženýrství, 2003-04)
    Propagation related parameters are used for design and frequency planning of microwave networks. Atmospheric refractive index is the important parameter that influences the propagation of electromagnetic waves during ...
  • A Terrestrial Multiple-Receiver Radio Link Experiment at 10.7 GHz - Comparisons of Results with Parabolic Equation Calculations 

    Valtr, P.; Pechač, Pavel; Kvicera, V.; Grabner, M. (Společnost pro radioelektronické inženýrství, 2010-04)
    This work presents the results of a terrestrial multiple-receiver radio link experiment at 10.7 GHz. Results are shown in the form of the power levels recorded at several antennas attached to a receiving mast. Comparisons ...