Wyświetlanie pozycji 1-20 z 23

  • Analysis and Implementation of Polarization Schemes for Polarimetric Radar Systems 

    Majurec, N.; Bonefacic, D. (Společnost pro radioelektronické inženýrství, 2007-09)
    Polarization schemes recently employed in atmospheric radar systems are described and compared. The considered polarization schemes are: the switching polarization scheme, the hybrid polarization scheme, and the extended ...
  • UMTS Network Model for Interference Analysis - Optimization of Spreading Codes Order 

    Ruzicka, Z.; Hanus, S. (Společnost pro radioelektronické inženýrství, 2007-09)
    This article deals with mathematical modeling of UMTS network. The presented model is designed for interference analysis in this network. The paper presents the set of simulations based on an idea of a specific order of ...
  • Wideband Rectangular Microstrip Patch Antenna Using L-Probe Feeding System 

    Hazdra, P.; Mazanek, M.; Cermak, J. (Společnost pro radioelektronické inženýrství, 2007-09)
    Paper focuses on so-called L-probe feeding technique suitable for wideband (30% relative bandwidth) driving of microstrip patch antennas. Physical explanation, simulation and measurement are presented. Further modification ...
  • A Robust Chaos-Based True Random Number Generator Embedded in Reconfigurable Switched-Capacitor Hardware 

    Drutarovsky, M.; Galajda, P. (Společnost pro radioelektronické inženýrství, 2007-09)
    This paper presents a new chaos-based True Random Number Generator (TRNG) with a decreased voltage supply sensitivity. Contrary to the traditionally used sources of randomness it uses a well-defined deterministic ...
  • Iterative Unsupervised GMM Training for Speaker Indexing 

    Paralic, M.; Jarina, R. (Společnost pro radioelektronické inženýrství, 2007-09)
    The paper addresses a novel algorithm for speaker searching and indexation based on unsupervised GMM training. The proposed method doesn\'t require a predefined set of generic background models, and the GMM speaker models ...
  • Combined Calibration Method and its Realization for Direction Finding Antenna Systems with Patch Antennas 

    Magyar, A.; Miko, G.; Seller, R. (Společnost pro radioelektronické inženýrství, 2007-09)
    A novel radio channel compensation method aiming to give optimal calibration for microstrip antenna array systems is presented in this paper, realized for an actual DOA measurement antenna system using microstrip antennas ...
  • Spreading Sequences Generated Using Asymmetrical Integer-Number Maps 

    Sebesta, V. (Společnost pro radioelektronické inženýrství, 2007-09)
    Chaotic sequences produced by piecewise linear maps can be transformed to binary sequences. The binary sequences are optimal for the asynchronous DS/CDMA systems in case of certain shapes of the maps. This paper is devoted ...
  • Routing Protocol for Mobile Ad-hoc Wireless Networks 

    Nogales, I. M. B. (Společnost pro radioelektronické inženýrství, 2007-09)
    Bluetooth is a cutting-edge technology used for implementing wireless ad hoc networks. In order to provide an overall scheme for mobile ad hoc networks, this paper deals with scatternet topology formation and routing ...
  • Examination of Newton's Method Used for Indirect Frequency Offset Estimation 

    Dzubera, J. (Společnost pro radioelektronické inženýrství, 2007-09)
    This paper deals with the topic of an indirect carrier frequency offset estimation and elimination. The main goal is to modify a conventional method as an attempt to develop a different approach and then to compare the ...
  • The Conformal Correction in the Strip Centered Coaxial Line Analysis 

    Sadek, V. (Společnost pro radioelektronické inženýrství, 2007-09)
    The presented work reports on the novel analysis of the strip-centered coaxial line. The conformal mapping method is used. For a narrow central strip a very easy conformal mapping is described that maps this structure onto ...
  • Quantum Description of Optical Devices Used in Interferometry 

    Kucera, P. (Společnost pro radioelektronické inženýrství, 2007-09)
    A quantum-mechanical description of the phase shifters, retarders, mirrors and beam splitters is given in the paper. The description is then applied on two types of states. On a coherent state, a classical-like state, and ...
  • Mathematical Representation of VoIP Connection Delay 

    Baronak, I.; Halas, M. (Společnost pro radioelektronické inženýrství, 2007-09)
    The main topic of this article is to define mathematical formulation of VoIP connection delay model. It handles about all partial delay components, the mechanism of their generation, facilities and their mathematical ...
  • Biquads Based on Single Negative Impedance Converter Implemented by Classical Current Conveyor 

    Dostal, T.; Axman, V. (Společnost pro radioelektronické inženýrství, 2007-09)
    The paper deals with continuous-time ARC biquadratic (second-order) filters based on the single classical three-port current conveyors, so called second generation CC II. A unique application of the CC II is discussed, ...
  • New Statistics for Texture Classification Based on Gabor Filters 

    Bandzi, P.; Oravec, M.; Pavlovicova, J. (Společnost pro radioelektronické inženýrství, 2007-09)
    The paper introduces a new method of texture segmentation efficiency evaluation. One of the well known texture segmentation methods is based on Gabor filters because of their orientation and spatial frequency character. ...
  • Software for CATV Design and Frequency Plan Optimization 

    Hala, O. (Společnost pro radioelektronické inženýrství, 2007-09)
    The paper deals with the structure of a software medium used for design and sub-optimization of frequency plan in CATV networks, their description and design method. The software performance is described and a simple design ...
  • Analysis of Analog Neural Network Model with CMOS Multipliers 

    Docheva, L.; Bekiarski, A.; Dochev, I. (Společnost pro radioelektronické inženýrství, 2007-09)
    The analog neural networks have some very useful advantages in comparison with digital neural network, but recent implementation of discrete elements gives not the possibility for realizing completely these advantages. The ...
  • Quadric Resistive Sheet Profile for Wideband Antennas 

    Reznicek, Z.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2007-09)
    A new type of a nonreflecting resistive dipole antenna with quadric continuous resistivity profile is presented in this paper. The antenna is mathematically described and compared with the antenna originally proposed by ...
  • Mean-Adaptive Real-Coding Genetic Algorithm and its Applications to Electromagnetic Optimization (Part Two) 

    Otevrel, V.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2007-09)
    In the paper, a novel instance of the real-coding genetic algorithm (RCGA), called the Mean-adaptive real-coding genetic algorithm (MAD-RCGA), is applied along with other RCGAs, to selected problems in microwaves. The ...
  • Mean-Adaptive Real-Coding Genetic Algorithm and its Applications to Electromagnetic Optimization (Part One) 

    Otevrel, V.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2007-09)
    In the paper, a novel instance of the real-coding steady-state genetic algorithm, called the Mean-adaptive real-coding genetic algorithm, is put forward. In this instance, three novel implementations of evolution operators ...
  • 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 ...