Poslední příspěvky

  • An Interference Cancellation Scheme for TFI-OFDM in Time-Variant Large Delay Spread Channel 

    Ida, Y.; Ahn, C.; Kamio, T.; Fujisaka, H.; Haeiwa, K. (Společnost pro radioelektronické inženýrství, 2009-04)
    In the mobile radio environment, signals are usually impaired by fading and multipath delay phenomenon. In such channels, severe fading of the signal amplitude and inter-symbol-interference (ISI) due to the frequency ...
  • An Empirical Ultra Wideband Channel Model for Indoor Laboratory Environments 

    Noori, N.; Karimzadeh-Baee, R.; Abolghasemi, A. (Společnost pro radioelektronické inženýrství, 2009-04)
    Channel measurement and modeling is an important issue when designing ultra wideband (UWB) communication systems. In this paper, the results of some UWB time-domain propagation measurements performed in modern laboratory ...
  • Modeling of Atmospheric Turbulence Effect on Terrestrial FSO Link 

    Prokes, A. (Společnost pro radioelektronické inženýrství, 2009-04)
    Atmospheric turbulence results in many effects causing fluctuation in the received optical power. Terrestrial laser beam communication is affected above all by scintillations. The paper deals with modeling the influence ...
  • Effects of Spreading Sequences on the Performance of MC-CDMA System with Nonlinear Models of HPA 

    Drotar, P.; Gazda, J.; Kocur, D.; Galajda, P. (Společnost pro radioelektronické inženýrství, 2009-04)
    Performance evaluation and comparison of multi-carrier code division multiple access (MC-CDMA) system model for different spreading sequences at the presence of Saleh and Rapp model of high power amplifier (HPA) is ...
  • A New Current Mode SIMO-Type Universal Biquad Employing Multi-Output Current Conveyors (MOCCIIs) 

    Wang, C.; Zhao, Y.; Zhang, Q.; Du, S. (Společnost pro radioelektronické inženýrství, 2009-04)
    This study presents a new current-mode singleinput and multi-output (SIMO) type universal biquad circuit using second generation multi-output current conveyors (MOCCII) as the active components. The proposed circuit employs ...
  • A Novel Frequency Synchronization Algorithm and its Cramer Rao Bound in Practical UWB Environment for MB-OFDM Systems 

    Sen, D.; Dasgupta, R.; Chakrabarti, S.; Kumar, R. V. R. (Společnost pro radioelektronické inženýrství, 2009-04)
    This paper presents an efficient time-domain coarse frequency offset (FO) synchronizer (TCFS) for multi-band orthogonal frequency division multiplexing (MB-OFDM) systems effective for practical ultra-wideband (UWB) ...
  • Simple Electromagnetic Modeling of Small Airplanes: Neural Network Approach 

    Koudelka, V.; Raida, Zbyněk; Tobola, P. (Společnost pro radioelektronické inženýrství, 2009-04)
    The paper deals with the development of simple electromagnetic models of small airplanes, which can contain composite materials in their construction. Electromagnetic waves can penetrate through the surface of the aircraft ...
  • Genetic Homogenization of Composite Materials 

    Jilkova, J.; Raida, Zbyněk; Tobola, P. (Společnost pro radioelektronické inženýrství, 2009-04)
    The paper is focused on numerical studies of electromagnetic properties of composite materials used for the construction of small airplanes. Discussions concentrate on the genetic homogenization of composite layers and ...
  • Homogeneous Dielectric Equivalents of Composite Material Shields 

    Zvolensky, T.; Raida, Zbyněk; Tobola, P. (Společnost pro radioelektronické inženýrství, 2009-04)
    The paper deals with the methodology of replacing complicated parts of an airplane skin by simple homogeneous equivalents, which can exhibit similar shielding efficiency. On one hand, the airplane built from the virtual ...
  • Application of the Global Optimization Approaches to Planar Near-Field Antenna Phaseless Measurements 

    Puskely, J.; Novacek, Z. (Společnost pro radioelektronické inženýrství, 2009-04)
    This paper deals with a method of the radiation pattern determination of the directional antennas. The method combining both the functional minimization method and the Fourier iterative algorithm is based on the phaseless ...
  • Radiation Efficiency Improvement of Zeroth-Order Resonator Antenna 

    Vrba, D.; Polivka, M. (Společnost pro radioelektronické inženýrství, 2009-04)
    The radiation as well as antenna efficiency of very thin profile zeroth-order resonator (ZOR) antenna, implemented in negative phase velocity (NPV) microstrip transmission line (TL) structure, has been solved by the method ...
  • Laguerre Polynomials’ Scheme of Transient Analysis: Scale Factor and Number of Temporal Basis Functions 

    Lacik, J. (Společnost pro radioelektronické inženýrství, 2009-04)
    The paper is focused on two important parameters of the scheme with weighted Laguerre polynomials: the scale factor of time axis and the number of temporal basis functions. In the first part of the paper, the approach for ...
  • Improved Analysis of Propagation over Irregular Terrain 

    Schejbal, V. (Společnost pro radioelektronické inženýrství, 2009-04)
    An improved analysis of propagation over irregular terrain using physical optics approximation of vector problem is presented. It offers more reliable numerical simulations for low altitude propagation and diffraction field ...