Now showing items 1-20 of 50

  • Comparison of Pilot Symbol Embedded Channel Estimation Algorithms 

    Kadlec, P.; Kejik, P.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2009-12)
    In the paper, algorithms of the pilot symbol embedded channel estimation are compared. Attention is turned to the Least Square (LS) channel estimation and the Sliding Correlator (SC) algorithm. Both algorithms are implemented ...
  • Derivation of Criterion Suitable for Evaluation of Multichannel Noise Reduction Systems for Speech Processing 

    Bolom, V.; Ingerle, J.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper deals with the theoretical derivation of the Noise Reduction criterion suitable for evaluation of multichannel noise reduction system performance. This criterion is suitable for noise suppression assessment and ...
  • Enhanced Receivers for Interference Cancellation in 3G Systems 

    Kejik, P.; Hanus, S. (Společnost pro radioelektronické inženýrství, 2009-12)
    Interference cancellation and multiuser detection in CDMA systems are still actual research topics. These techniques enable us to deal with interference and to increase system capacity. In this paper, a so-called Generalized ...
  • Channel Capacity Enhancement by Pattern Controlled Handset Antenna 

    Arai, H.; Ohno, J. (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper presents a radiation pattern controlled antenna for handset terminals to reduce the correlation coefficient between antennas and enhance the channel capacity in MIMO applications. A pair of small inverted-F ...
  • Axial Vircator for Electronic Warfare Applications 

    Drazan, L.; Vrana, R. (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper deals with a high power microwave generator with virtual cathode – vircator in axial release for electronic warfare applications. The classification of directed energy weapons microwave (DEWM) is introduced ...
  • Antenna-User Interaction in MIMO-Enabled Laptops 

    Guterman, J.; Moreira, A.; Peixeiro, C.; Rahmat-Samii, Y. (Společnost pro radioelektronické inženýrství, 2009-12)
    The operation of wireless personal communication terminals very close to the user inherently faces the problem of electromagnetic (EM) coupling between the device and the biological tissues. In this paper the effects of ...
  • Fast Keyword Spotting in Telephone Speech 

    Nouza, J.; Silovsky, J. (Společnost pro radioelektronické inženýrství, 2009-12)
    In the paper, we present a system designed for detecting keywords in telephone speech. We focus not only on achieving high accuracy but also on very short processing time. The keyword spotting system can run in three modes: ...
  • Repeatable Performance Measurements of MIMO Systems in Connected Reverberation Chambers with Controlled Keyhole Effect 

    Orlenius, C.; Andersson, M. (Společnost pro radioelektronické inženýrství, 2009-12)
    A straightforward, fast, and repeatable procedure for measuring the system performance of the antennas in a MIMO system is presented. Due to the use of two connected reverberation chambers, the so called keyhole effect is ...
  • Maximum Available Accuracy of FM-CW Radars 

    Ricny, V. (Společnost pro radioelektronické inženýrství, 2009-12)
    This article deals with the principles and above all with the maximum available measuring accuracy analyse of FM-CW (Frequency Modulated Continuous Wave) radars, which are usually employed for distance and velocity ...
  • A High-Capacity Image Data Hiding Scheme Using Adaptive LSB Substitution 

    Yang, H.; Sun, X.; Sun, G. (Společnost pro radioelektronické inženýrství, 2009-12)
    Many existing steganographic methods hide more secret data into edged areas than smooth areas in the host image, which does not differentiate textures from edges and causes serious degradation in actual edge areas. To avoid ...
  • Efficient Procedure for the Calculation of Electric and Magnetic Energies in Vacuum 

    Vandenbosch, G. A. E. (Společnost pro radioelektronické inženýrství, 2009-12)
    New expressions are derived to calculate the reactive energy stored in the electromagnetic field surrounding an electromagnetic device. The resulting expressions are 1. very simple to interpret, 2. general, 3. rigorous in ...
  • Characterization of Antennas on Dielectric and Magnetic Substrates Effective Medium Approximation 

    Rialet, D.; Sharaiha, A.; Tarot, A.; Castel, X.; Delaveaud, C. (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper presents a study of the effective medium approximation of a monopole antenna printed on either a dielectric or a magnetic substrate. Simple analytical formulas to determine the effective permeability of such an ...
  • Embedded Platform for Automatic Testing and Optimizing of FPGA Based Cryptographic True Random Number Generators 

    Varchola, M.; Drutarovsky, M. (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper deals with an evaluation platform for cryptographic True Random Number Generators (TRNGs) based on the hardware implementation of statistical tests for FPGAs. It was developed in order to provide an automatic ...
  • Performance of Predictor Based Link Adaptation Algorithms 

    Wieser, V.; Psenak, V. (Společnost pro radioelektronické inženýrství, 2009-12)
    The presented paper deals with the link adaptation algorithms in mobile radio access networks based on Wideband Code Division Multiple Access (WCDMA). The mobile radio channel has a significant impact on the transmitted ...
  • Modeling of Transmission Functions and Crosstalk in Metallic Cables for Implementation of MIMO Concept 

    Lafata, P.; Vodrazka, J. (Společnost pro radioelektronické inženýrství, 2009-12)
    The new promising wireless networks based on multi-carrier modulations (MCM) and multiple-input multiple-output concept (MIMO) will soon offer high-speed digital connections. Their access points are mostly connected by ...
  • A CPW-Fed Novel Planar Ultra-Wideband Antenna with a Band-Notch Characteristic 

    Yu, F.; Wang, C. (Společnost pro radioelektronické inženýrství, 2009-12)
    A coplanar waveguide (CPW) fed novel planar ultra-wideband antenna with a band-notch characteristic is presented. The proposed antenna consists of a rectangular metal radiation patch and a tapered arc-shaped ground plane. ...
  • Analyses of Real Email Traffic Properties 

    Malinka, K.; Hanacek, P.; Cvrcek, D. (Společnost pro radioelektronické inženýrství, 2009-12)
    In this paper, we perform an empirical analysis of email traffic logs obtained from a large university to better understand its impact on the effectiveness and efficiency of anonymous mix remailers. We analyzed data ...
  • A Miniaturization Technique of a Compact Omnidirectional Antenna 

    Sufyar, S.; Delaveaud, C. (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper discusses a miniaturization technique of a compact omnidirectional antenna. A slot loading technique is applied to a well-known low-profile antenna structure whose radiation characteristics are similar to ...
  • Circuit Based Optimization of Radiation Characteristics of Single and Multi-Port Antennas 

    Karlsson, K.; Carlsson, J. (Společnost pro radioelektronické inženýrství, 2009-12)
    A method for analyzing and optimizing multiport antennas is presented and exemplified. The method was first presented in [1]-[3] and uses data from full wave electromagnetic field (EM) solvers in combination with circuit ...
  • Efficient Testing of Wireless Devices from 800 MHz to 18 GHz 

    Foged, L. J.; Scannavini, A. (Společnost pro radioelektronické inženýrství, 2009-12)
    Small antennas and other modern communication applications are using increasingly higher frequencies while demanding shorter development time and very rapid testing cycles. A fast and accurate way to exhaustively determine ...