Now showing items 1-20 of 50

  • Dual Band High Efficiency Power Amplifier Based on CRLH Lines 

    Jimenez-Martin, J. L.; Gonzalez-Posadas, V.; Arques, F. J.; Garcia-Munoz, L. E.; Segovia-Vargas, D. (Společnost pro radioelektronické inženýrství, 2009-12)
    In this paper we propose the use of Composite Right/Left Hand (CRLH) and Extended Composite Right/Left Hand (ECRLH) transmission lines for the design of dual band high efficiency power amplifiers working in CE class. The ...
  • Modeling of Transmission Functions and Crosstalk in Metallic Cables for Implementation of MIMO Concept 

    Lafata, Pavel; Vodrazka, Jiri (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 ...
  • Fast Keyword Spotting in Telephone Speech 

    Nouza, Jan; Silovsky, Jan (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: ...
  • An Ultra-Low-Voltage and Ultra-Low-Power 2.4 GHz LNA Design 

    Liu, Baimei; Wang, Chunhua; Ma, Minglin; Guo, Shengqiang (Společnost pro radioelektronické inženýrství, 2009-12)
    In this paper, ultra-low-voltage and ultra-low-power circuit techniques are presented for CMOS RF front-ends. By employing a modified current-reused architecture, the low-noise amplifier (LNA) can operate at a very low ...
  • Audio Surveillance through Known Event Classification 

    Grezl, Frantisek; Cernocky, Jan (Společnost pro radioelektronické inženýrství, 2009-12)
    The way of audio surveillance through known event classification is presented introducing simple yet efficient framework. The use of the proposed system for unknown event detection is also suggested and evaluated. Further, ...
  • Utilization of Birefringent Fiber as Sensor of Temperature Field Disturbance 

    Dvorak, Filip; Maschke, Jon; Vlcek, Cestmir (Společnost pro radioelektronické inženýrství, 2009-12)
    The paper deals with utilization of induced birefringence sensitivity to temperature field in birefringent optical fibers. The propagating optical wave and optical fibers are described by means of coherency and Jones ...
  • A High-Capacity Image Data Hiding Scheme Using Adaptive LSB Substitution 

    Yang, Hengfu; Sun, Xingming; Sun, Guang (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 ...
  • Evaluation of a Mutually Coupled Diversity Receiver 

    Volmer, Christian; Stephan, Ralf; Hein, Matthias A. (Společnost pro radioelektronické inženýrství, 2009-12)
    A quick, reliable, and simple evaluation of mutual coupling effects is essential for the optimization of antenna arrays for small mobile communications devices. In recent papers we have proposed novel figures of merit that ...
  • Multilateral Interoperability Programme 

    Burita, Ladislav (Společnost pro radioelektronické inženýrství, 2009-12)
    The Multilateral Interoperability Programme (MIP) is a voluntary and independent activity in NATO environment by the participating nations and organizations. The MIP concept is based on data exchange in form of common ...
  • Characterization of Antennas on Dielectric and Magnetic Substrates Effective Medium Approximation 

    Rialet, Damien; Sharaiha, Ala; Tarot, Anne-Claude; Castel, Xavier; Delaveaud, Christophe (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 ...
  • State-of-the-Art System Solutions for Unmanned Underwater Vehicles 

    Yildiz, Ozgur; Yilmaz, Asim Egemen; Gokalp, Bulent (Společnost pro radioelektronické inženýrství, 2009-12)
    Unmanned Underwater Vehicles (UUVs) have gained popularity for the last decades, especially for the purpose of not risking human life in dangerous operations. On the other hand, underwater environment introduces numerous ...
  • EMC Specific Problems of Frequency Converters Used at Interlocking Device 

    Novak, Jaroslav; Dolecek, Radovan; Cerny, Ondrej (Společnost pro radioelektronické inženýrství, 2009-12)
    The paper deals with problems of electromagnetic compatibility (EMC) of frequency control drive of electromotive switch actuator of railway switch. The frequency converter with Pulse Width Modulation (PWM) and the output ...
  • Maximum Available Accuracy of FM-CW Radars 

    Ricny, Vaclav (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 ...
  • Circuit Based Optimization of Radiation Characteristics of Single and Multi-Port Antennas 

    Karlsson, Kristian; Carlsson, Jan (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 ...
  • Dual Band a-Si:H Solar-Slot Antenna for 2.4/5.2GHz WLAN Applications 

    Shynus, S., V; Ons, Maria J. Roo; Ammann, Max J.; Norton, Brian (Společnost pro radioelektronické inženýrství, 2009-12)
    A simple and compact design of solar-slot antenna for dual band 2.4/5.2GHz wireless local area networks (WLAN) applications is proposed. The design employs amorphous silicon (a-Si:H) solar cells in polyimide substrate with ...
  • Comparison of Pilot Symbol Embedded Channel Estimation Algorithms 

    Kadlec, Petr; Kejik, Petr; Raida, Zbynek (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 ...
  • Impact of Finger Placement on the Correlation Properties of Rake Combined Signals 

    Baltzis, Konstantinos B. (Společnost pro radioelektronické inženýrství, 2009-12)
    3G mobile devices and base stations employ rake receivers. An important issue in the design of such receivers is finger allocation. This paper explores the relationship between finger placement and the correlation properties ...
  • Two-Element PIFA Array Structure for Polarization Diversity in UMTS Mobile Phones 

    Ferrero, Fabien; Diallo, Aliou; Luxey, Cyril; Derat, Benoit; Hamouz, Pavel; Hazdra, Pavel; Rahola, Jussi (Společnost pro radioelektronické inženýrství, 2009-12)
    In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100x40 mm2 metallic ground plane acting as the ...
  • Considerations on Configurable Multi-Standard Antennas for Mobile Terminals Realized in LTCC Technology 

    Manteuffel, Dirk; Arnold, Matthias; Uhlig, Peter (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper is an extended version of a paper presented at the EuCAP 2009 conference [1]. We present part of a long term research project that aims on designing a (re-)configurable multi-standard antenna element for 4G (4th ...
  • Shielded Micro-Coplanar CRLH TL Zeroth-Order Resonator Antenna: Critical Performance Evaluation 

    Polivka, Milan; Vrba, David (Společnost pro radioelektronické inženýrství, 2009-12)
    The attention of this paper is focused on the four unit cell zeroth-order resonator antenna (ZORA), manufactured on a shielded micro-coplanar composite right/left-handed (CRLH) transmission line structure. The antenna was ...