Now showing items 1-20 of 34

  • Novel Approach to Design Ultra Wideband Microwave Amplifiers: Normalized Gain Function Method 

    Kopru, R.; Kuntman, H.; Yarman, B. S. (Společnost pro radioelektronické inženýrství, 2013-09)
    In this work, we propose a novel approach called as “Normalized Gain Function (NGF) method” to design low/medium power single stage ultra wide band microwave amplifiers based on linear S parameters of the active device. ...
  • Application of the CBF Method to the Scattering by Combinations of Bodies of Revolution and Arbitrarily Shaped Structures 

    Kucharski, A. A. (Společnost pro radioelektronické inženýrství, 2013-09)
    In this paper, an algorithm is described which enables efficient analysis of electromagnetic scattering by configurations consisting of arbitrarily shaped conducting bodies and conducting bodies of revolution (BoR). The ...
  • Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances 

    Kumar, P.; Tripathi, C. C. (Společnost pro radioelektronické inženýrství, 2013-09)
    Film bulk acoustic wave resonators (FBARs) are of great interest for wireless applications due to its inherent advantages at microwave frequencies. However, the presence of spurious modes near the main resonance degrades ...
  • Compact and Broadband Microstrip-Line-Fed Modified Rhombus Slot Antenna 

    Pan, C. Y.; Jan, J. Y.; Wang, L. C. (Společnost pro radioelektronické inženýrství, 2013-09)
    The printed microstrip-line-fed broadband rhombus slot antenna is investigated in this paper. With the use of the offset microstrip feed line and the corner-truncated protruded ground plane, the bandwidth enhancement and ...
  • Distributed Extended Kalman Filter for Position, Velocity, Time, Estimation in Satellite Navigation Receivers 

    Jakubov, O.; Kovar, P.; Kacmarik, P.; Vejrazka, F. (Společnost pro radioelektronické inženýrství, 2013-09)
    Common techniques for position-velocity-time estimation in satellite navigation, iterative least squares and the extended Kalman filter, involve matrix operations. The matrix inversion and inclusion of a matrix library ...
  • A Powerful Optimization Tool for Analog Integrated Circuits Design 

    Kubar, M.; Jakovenko, J. (Společnost pro radioelektronické inženýrství, 2013-09)
    This paper presents a new optimization tool for analog circuit design. Proposed tool is based on the robust version of the differential evolution optimization method. Corners of technology, temperature, voltage and current ...
  • Novel Resistorless Mixed-Mode PID Controller with Improved Low-Frequency Performance 

    Silaruam, V.; Lorsawatsiri, A.; Wongtaychatham, C. (Společnost pro radioelektronické inženýrství, 2013-09)
    This paper introduces a new resistorless mixed-mode proportional-integral-derivative (PID) controller. It employs six simple transconductors and only two grounded capacitors. The proposed PID controller offers several ...
  • Ultra Low-Power Analog Median Filters 

    Diaz-Sanchez, A.; Lemus-Lopez, J.; Rocha Perez, J. M.; Ramirez-Angulo, J.; Molinar Solis, J. E.; Vazquez-Leal, H. (Společnost pro radioelektronické inženýrství, 2013-09)
    The design and implementation of three analog median filter topologies, whose transistors operate in the deep weak-inversion region, is described. The first topology is a differential pairs array, in which drain currents ...
  • Fade Depth Prediction Using Human Presence for Real Life WSN Deployment 

    Horvat, G.; Rimac-Drlje, S.; Zagar, D. (Společnost pro radioelektronické inženýrství, 2013-09)
    Current problem in real life WSN deployment is determining fade depth in indoor propagation scenario for link power budget analysis using (fade margin parameter). Due to the fact that human presence impacts the performance ...
  • Modeling and Analysis of Sub-Banding the Secondary Users’ Channel in Cognitive Radio Networks 

    Homayouni, S.; Ghorashi, S. A. (Společnost pro radioelektronické inženýrství, 2013-09)
    Modern cognitive radio systems employ dynamic spectrum access techniques and these networks allow more efficient usage of scarce spectrum. Secondary users are supposed to operate in primary users’ channels without interfering ...
  • Directional Relays for Multi-Hop Cooperative Cognitive Radio Networks 

    Nouri, N.; Noori, N. (Společnost pro radioelektronické inženýrství, 2013-09)
    In this paper, we investigate power allocation and beamforming in a relay assisted cognitive radio (CR) network. Our objective is to maximize the performance of the CR network while limiting interference in the direction ...
  • An Efficient Sparse Representation Algorithm for Direction-of-Arrival Estimation 

    Sun, L.; Wang, H.-L.; Xu, G.-J (Společnost pro radioelektronické inženýrství, 2013-09)
    This paper presents an efficient sparse representation approach to direction-of-arrival (DOA) estimation using uniform linear arrays. The proposed approach constructs the jointly sparse model in real domain by exploiting ...
  • Robust Power and Subcarrier Allocation for OFDM-based Cognitive Radio Networks Considering Spectrum Sensing Uncertainties 

    Fathi, H.; Sadough, S. M.-S. (Společnost pro radioelektronické inženýrství, 2013-09)
    ‎In this paper‎, ‎we address power and subcarrier allocation for cooperative cognitive radio (CR) networks in the presence of spectrum sensing errors‎. ‎First‎, ‎we derive the mutual interference of primary and secondary ...
  • Beamforming Network Using Dual Band-Dual Beam Reduced Size Butler Matrices 

    Jizat, N. M.; Rahim, S. K. A.; Nor, M. Z. M.; Abdulrahman, Y.; Sabran, M. I.; Jamlos, M. F. (Společnost pro radioelektronické inženýrství, 2013-09)
    The results of reduced- size cascaded Butler matrices developed for dual-band and dual-beam applications are presented in this paper. The meander-line technique, an acceptable approach for reducing the size of the radio ...
  • HAPS Gateway Link in the 5850-7075 MHz and Coexistence with Fixed Satellite Service 

    Ahmed, M.; Rahman, T.; Abdalla, Y. (Společnost pro radioelektronické inženýrství, 2013-09)
    Gateway link is essential to connect HAPS platform to terrestrial based networks. This crucial link is incorporated in HAPS fixed service spectrum allocation in considerably high frequencies, renders the link for more ...
  • Connectivity-Based Self-Localization in WSNs 

    Kenyeres, J.; Kenyeres, M.; Rupp, M.; Farkas, P. (Společnost pro radioelektronické inženýrství, 2013-09)
    Efficient localization methods are among the major challenges in wireless sensor networks today. In this paper, we present our so-called connectivity based approach i.e, based on local connectivity information, to tackle ...
  • Cost-Efficient Development of Acoustic Models for Speech Recognition of Related Languages 

    Nouza, J.; Cerva, P.; Kucharova, M. (Společnost pro radioelektronické inženýrství, 2013-09)
    When adapting an existing speech recognition system to a new language, major development costs are associated with the creation of an appropriate acoustic model (AM). For its training, a certain amount of recorded and ...
  • A Compressed Sensing-Based Low-Density Parity-Check Real-Number Code 

    He, Zaixing; Ogawa, Takahiro; Haseyama, Miki; Zhao, Xinyue; Zhang, Shuyou (Společnost pro radioelektronické inženýrství, 2013-09)
    In this paper, we propose a novel low-density parity-check real-number code, based on compressed sensing. A real-valued message is encoded by a coding matrix (with more rows than columns) and transmitted over an erroneous ...
  • Codes Cross-Correlation Impact on S-curve Bias and Data-Pilot Code Pairs Optimization for CBOC Signals 

    Yang, Z.; Huang, Z.; Geng, S. (Společnost pro radioelektronické inženýrství, 2013-09)
    The aim of this paper is to analyze the impact of spreading codes cross-correlation on code tracking performance, and to optimize the data-pilot code pairs of Galileo E1 Open Service (OS) Composite Binary Offset Carrier ...
  • Segmentation of Sedimentary Grain in Electron Microscopy Image 

    Krupka, A.; Riha, K.; Krizova, L. (Společnost pro radioelektronické inženýrství, 2013-09)
    This paper describes a novel method developed for the segmentation of sedimentary grains in electron microscopy images. The algorithm utilizes the approach of region splitting and merging. In the splitting stage, the ...