Poslední příspěvky

  • Resource Planning for Voice over Wireless Both-Way Transmission Media 

    Tsankov, B.; Pachamanov, R.; Pachamanova, D. (Společnost pro radioelektronické inženýrství, 2008-04)
    The medium in IEEE 802.11- and IEEE 802.16-based networks for voice communications can be considered “both-way” - for transmission and reception. Therefore, the packet arrivals for voice dialogue services in such networks ...
  • Broadband Measurement of Complex Permittivity Using Reflection Method and Coaxial Probes 

    Zajicek, R.; Oppl, L.; Vrba, J. (Společnost pro radioelektronické inženýrství, 2008-04)
    This paper describes and evaluates a method for determining complex permittivity, and presents results of permittivity measurement of some substances. Complex permittivity of a phantom of biological muscle tissue, of some ...
  • Common Virtual Path and Its Expedience for VBR Video Traffic 

    Chromy, E.; Baronak, I. (Společnost pro radioelektronické inženýrství, 2008-04)
    The paper deals with utilization of common Virtual Path (VP) for variable bit rate (VBR) video service. Video service is one of the main services for broadband networks. Research is oriented to statistical properties of ...
  • Design of Primary Feeds for 32m KDDI Antenna System IBA-4 in Cassegrain Configuration 

    Galuscak, R.; Watanabe, M.; Hazdra, P.; Takeda, S.; Seki, K.; Prochazka, M.; Uchiyama, Y. (Společnost pro radioelektronické inženýrství, 2008-04)
    Physically large dimensional dish antennas in Cassegrain configuration have played an important role in satellite communications during the past several decades. Recently, however, emerging new technologies have begun to ...
  • Recognition of OFDM Modulation Method 

    Ulovec, K. (Společnost pro radioelektronické inženýrství, 2008-04)
    This contribution deals with asynchronous noncoherent recognition of modulation types. The main aim is to recognize OFDM modulation method from some other single-carrier analog and digital modulation types in the presence ...
  • Wavelet Based Hilbert Transform with Digital Design and Application to QCM-SS Watermarking 

    Maity, S. P.; Maity, S. (Společnost pro radioelektronické inženýrství, 2008-04)
    In recent time, wavelet transforms are used extensively for efficient storage, transmission and representation of multimedia signals. Hilbert transform pairs of wavelets is the basic unit of many wavelet theories such as ...
  • Time-Frequency Decomposition of an Ultrashort Pulse: Wavelet Decomposition 

    Khelladi, M.; Seddiki, O.; Bendimerad, F. T. (Společnost pro radioelektronické inženýrství, 2008-04)
    An efficient numerical algorithm is presented for the numerical modeling of the propagation of ultrashort pulses with arbitrary temporal and frequency characteristics through linear homogeneous dielectrics. The consequences ...
  • Planar Tri-Band Antenna Design 

    Pokorny, M.; Horak, J.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2008-04)
    The paper briefly uncovers techniques used for a design of compact planar antennas in order to achieve the wideband and the multi-band capability. The main topic is aimed to the multi-objective optimization using genetic ...
  • Provision of 3G Mobile Services in Sparsely Populated Areas Using High Altitude Platforms 

    Holis, J.; Pechač, Pavel (Společnost pro radioelektronické inženýrství, 2008-04)
    This paper deals with the application of High Altitude Platforms for the provision of third generation mobile services in sparsely-populated areas or in developing countries. It focuses on the behavior of large cells ...
  • Ultra-Wideband Coplanar-Fed Monopoles: A Comparative Study 

    Jilkova, J.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2008-04)
    The paper provides an experimental comparison of four types of ultra-wideband coplanar-fed planar monopole antennas. Parameters of the open stub completed by an L-shaped monopole and the cross monopole were adopted from ...
  • S-Parameter Uncertainties in Network Analyzer Measurements with Application to Antenna Patterns 

    Yannopoulou, N.; Zimourtopoulos, P. (Společnost pro radioelektronické inženýrství, 2008-04)
    An analytical method was developed to estimate uncertainties in full two-port Vector Network Analyzer measurements, using total differentials of S-parameters. System error uncertainties were also estimated from total ...
  • Analysis of a New Three-Dimensional Quadratic Chaotic System 

    Elhadj, Z. (Společnost pro radioelektronické inženýrství, 2008-04)
    This paper has reported the finding of a new simple three dimensional quadratic chaotic system with three nonlinearities obtained by adding a cross-product nonlinear term to the first equation of the Lu system. Basic ...