Poslední příspěvky

  • Estimation of Spread Spectrum Signal Parameters Utilizing Wavelet Transform Analysis 

    Leonis, N.; Katsoulis, G.; Amditis, A.; Uzunoglu, N. (Společnost pro radioelektronické inženýrství, 2005-04)
    This paper investigates the application of wavelet transform (WT) to the extraction of particular features of direct sequence spread spectrum signals. The WT is exploited to the point that not only its capabilities but ...
  • Analysis of Rain Rate Spatial Cross-Correlation Coefficients in the Basque Country Area 

    Romo, J. A.; Anitzine, I. F.; Fontan, F. P.; Marino, P. (Společnost pro radioelektronické inženýrství, 2005-04)
    This paper reports on a study on the spatial characteristics of rain rates recorded in the Basque region in northern Spain. To perform this study a network of eighty raingauges spread throughout the region has been used. ...
  • Detection of Acoustic Change-Points in Audio Streams and Signal Segmentation 

    Zdansky, J. (Společnost pro radioelektronické inženýrství, 2005-04)
    This contribution proposes an efficient method for the detection of relevant changes in continuous stream of sound. The detected change-points can then serve for the segmentation of long audio recordings into shorter and ...
  • Codebook Code Division Multiple Access Image Steganography 

    Levicky, D.; Surin, S. (Společnost pro radioelektronické inženýrství, 2005-04)
    In this paper, a new modification of spread spectrum image steganography (SSIS) is presented. The proposed modification of SSIS hides and recovers a message of substantial length within digital image while maintaining the ...
  • 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 ...
  • Impact of Ultra Wide Band (UWB) on Macrocell Downlink of DCS-1800 and GSM-900 Systems 

    Taha-Ahmed, B.; Calvo-Ramon, M.; Haro-Ariet, L. D. (Společnost pro radioelektronické inženýrství, 2005-04)
    The effect of UWB interference on the DCS-1800 and GSM-900 downlink is studied for different UWB power density. For high UWB power density (-70 dBm/MHz), the effect of UWB signals is very high when the distance between UWB ...
  • Methods for Speech SNR Estimation: Evaluation Tool and Analysis of VAD Dependency 

    Vondrasek, M.; Pollak, P. (Společnost pro radioelektronické inženýrství, 2005-04)
    The dynamic range of broadband digital system is mostly limited by harmonics and spurious arising from ADC nonlinearity. The nonlinearity may be described in several ways. The distinction between static and dynamic ...
  • An Adaptive Block-Based Eigenvector Equalization for Time-Varying Multipath Fading Channels 

    Landquist, R.; Mohammed, A. (Společnost pro radioelektronické inženýrství, 2005-04)
    In this paper we present an adaptive Block-Based EigenVector Algorithm (BBEVA) for blind equalization of time-varying multipath fading channels. In addition we assess the performance of the new algorithm for different ...
  • Intelligent FDSS Overlay on GSM System (Uplink Analysis) 

    Taha-Ahmed, B.; Calvo-Ramon, M.; Haro-Ariet, L. D. (Společnost pro radioelektronické inženýrství, 2005-04)
    The overlay of an intelligent frequency diversity spread spectrum system (FDSS) on the (GSM) system is studied. The uplink capacity of both systems is given using a model of 36 hexagonal macrocells. Performance of GSM and ...
  • An Efficient and Effective Pilot Space-Time Adaptive Algorithm for Mobile Communication Systems 

    Landquist, R.; Mohammed, A. (Společnost pro radioelektronické inženýrství, 2005-04)
    In this paper we present a new adaptive space-time algorithm for mitigating the effects of CCI and ISI and minimizing the probability of error in mobile communication systems, and evaluate its performance for different ...
  • Static and Dynamic Nonlinearity of A/D Converters 

    Halamek, J.; Viscor, I.; Kasal, M.; Villa, M. (Společnost pro radioelektronické inženýrství, 2005-04)
    The dynamic range of broadband digital system is mostly limited by harmonics and spurious arising from ADC nonlinearity. The nonlinearity may be described in several ways. The distinction between static and dynamic ...