Browsing 2013/4 by Title

Now showing items 1-20 of 42

  • Adaptive Distance Estimation Based on RSSI in 802.15.4 Network 

    Botta, Miroslav; Simek, Milan (Společnost pro radioelektronické inženýrství, 2013-12)
    This paper deals with the distance estimation issue in 802.15.4 wireless sensor networks. On a basis of signal strength of received frames a distance between two sensor nodes using the log-normal shadowing radio propagation ...

  • Broadband RCS Reduction of Microstrip Patch Antenna Using Bandstop Frequency Selective Surface 

    Yang, Huan-huan; Cao, Xiang-yu; Zheng, Qiu-rong; Ma, Jia-jun; Li, Wen-qiang (Společnost pro radioelektronické inženýrství, 2013-12)
    In this article, a simple and effective approach is presented to reduce the Radar Cross Section (RCS) of microstrip patch antenna in ultra broad frequency band. This approach substitutes a metallic ground plane of a ...

  • Channel Parameters Estimation Algorithm Based on The Characteristic Function under Impulse Noise Environment 

    Xu, Zhijiang; Wang, Kang; Meng, Limin (Společnost pro radioelektronické inženýrství, 2013-12)
    Under communication environments, such as wireless sensor networks, the noise observed usually exhibits impulsive as well as Gaussian characteristics. In the initialization of channel iterative decoder, such as low density ...

  • Circuital and Numerical Models for Calculation of Shielding Effectiveness of Enclosure with Apertures and Monitoring Dipole Antenna Inside 

    Milutinovic, Vesna; Cvetkovic, Tatjana; Doncov, Nebojsa; Milovanovic, Bratislav (Společnost pro radioelektronické inženýrství, 2013-12)
    In this paper, circuital and numerical models of metal In this paper, circuital and numerical models of metal enclosure with apertures are considered for the purpose of accurate shielding effectiveness calculation. An ...

  • Closed-Form Approximation for Parallel-Plate Waveguide Coefficients 

    Valtr, Pavel; Pechac, Pavel (Společnost pro radioelektronické inženýrství, 2013-12)
    Simple closed-form formulas for calculating coefficients of modes excited in a parallel-plate waveguide illuminated by a planar wave are presented. The mode-matching technique and Green’s formula are used to arrive at a ...

  • Cramer-Rao Bound for Target Localization for Widely Separated MIMO Radar 

    Kalkan, Yilmaz (Společnost pro radioelektronické inženýrství, 2013-12)
    In this paper, we derive the Cramer-Rao Bounds (CRBs) for the 2-dimensional (2D) target localization and velocity estimations for widely separated Multiple-Input Multiple-Output (MIMO) radar. The transmitters emit signals ...

  • Design and Investigation of Photonic Remote Antenna Units for Bidirectional Transmission in the Last Mile Wireless over Fiber System 

    Lysiuk, Anna; Godziszewski, Konrad; Yashchyshyn, Yevhen; Modelski, Jozef (Společnost pro radioelektronické inženýrství, 2013-12)
    In the article three different photonic Remote Antenna Units (RAU) in the last mile Wireless over Fiber links are presented. For construction of RAU commercially available optoelectronic devices were used. The solutions ...

  • Design of a Compact Wideband Antenna Array for Microwave Imaging Applications 

    Puskely, Jan; Mikulasek, Tomas; Raida, Zbynek (Společnost pro radioelektronické inženýrství, 2013-12)
    In the paper, wideband antenna arrays aimed at microwave imaging applications and SAR applications operating at Ka band were designed. The antenna array feeding network is realized by a low-loss SIW technology. Moreover, ...

  • Design of Compact BPF and Planar Diplexer for UMTS using Embedded-scheme Resonator 

    Zong, Bin-Feng; Wang, Guang-Ming; Wang, Ya-Wei; Wu, Fan (Společnost pro radioelektronické inženýrství, 2013-12)
    A compact planar diplexer utilizing embedded-scheme resonator (ESR) is designed for universal mobile telecommunications system (UMTS). The ESR is formed by embedding interdigital resonators into an open loop resonator. ...

  • The Design of Polymer Planar Optical Triplexer with MMI Filter and Directional Coupler 

    Jerabek, Vitezslav; Busek, Karel; Prajzler, Vaclav; Mares, David; Svoboda, Rudolf (Společnost pro radioelektronické inženýrství, 2013-12)
    Optical bidirectional WDM transceiver is a key component of the Passive Optical Network of the Fiber to the Home topology. Essential parts of such transceivers are filters that combine multiplexing and demultiplexing ...

  • Digitally Programmable High-Q Voltage Mode Universal Filter 

    Singh, Devesh; Afzal, Neelofer (Společnost pro radioelektronické inženýrství, 2013-12)
    A new low-voltage low-power CMOS current feedback amplifier (CFA) is presented in this paper. This is used to realize a novel digitally programmable CFA (DPCFA) using transistor arrays and MOS switches. The proposed ...

  • Effect of Location Accuracy and Shadowing on the Probability of Non-Interfering Concurrent Transmissions in Cognitive Ad Hoc Networks 

    Montejo, Samuel; Souza, Richard Demo; Fernandez, Evelio M. G.; Alfonso, Vitalio; Godoy, Walter (Společnost pro radioelektronické inženýrství, 2013-12)
    Cognitive radio ad hoc systems can coexist with a primary network in a scanning-free region, which can be dimensioned by location awareness. This coexistence of networks improves system throughput and increases the efficiency ...

  • An Efficient Forensic Method for Copy–move Forgery Detection based on DWT-FWHT 

    Yang, Bin; Sun, Xingming; Chen, Xianyi; Zhang, Jianjun; Li, Xu (Společnost pro radioelektronické inženýrství, 2013-12)
    As the increased availability of sophisticated image processing software and the widespread use of Internet, digital images are easy to acquire and manipulate. The authenticity of the received images is becoming more and ...

  • An Efficient Method for GPS Multipath Mitigation Using the Teager-Kaiser-Operator-based MEDLL 

    Hui, Yi; Song, Maozhong; Meng, Bin; Dang, Xiaoyu (Společnost pro radioelektronické inženýrství, 2013-12)
    An efficient method for GPS multipath mitigation is proposed. The motivation for this proposed method is to integrate the Teager-Kaiser Operator (TKO) with the Multipath Estimating Delay Lock Loop (MEDLL) module to mitigate ...

  • Electronically Tunable Resistorless Mixed Mode Biquad Filters 

    Yesil, Abdullah; Kacar, Firat (Společnost pro radioelektronické inženýrství, 2013-12)
    This paper presents a new realization of elec¬tronically tunable mixed mode (including transadmittance- and voltage-modes) biquad filter with single input, three outputs or three inputs, single output using voltage ...

  • An Improved Slant Path Attenuation Prediction Method in Tropical Climates 

    Abdulrahman, A. Y.; Rahman, T. A.; Islam, M. R.; Olufeagba, B. J.; Yussuff, A.; Khamis, N. H. Haji (Společnost pro radioelektronické inženýrství, 2013-12)
    An improved method for predicting slant path attenuation in tropical climates is presented in this paper. The proposed approach is based on rain intensity data R_0.01 (mm/h) from 37 tropical and equatorial stations; and ...

  • Independent Component Analysis of Complex Valued Signals Based on First-order Statistics 

    Xu, Peng-cheng; Shen, Yue-hong; Li, Hui; Wang, Jiang-gong; Wu, Kun (Společnost pro radioelektronické inženýrství, 2013-12)
    This paper proposes a novel method based on first-order statistics, aims to solve the problem of the independent component extraction of complex valued signals in instantaneous linear mixtures. Single-step and iterative ...

  • Influence of High Level Features of HVS on Performance of FSIM 

    Dostal, Petr; Krasula, Lukas; Klima, Milos (Společnost pro radioelektronické inženýrství, 2013-12)
    In this paper the influence of information about high level features of Human Visual System (HVS) on objective quality assessment is studied. This was done by extending the existing full-reference objective image quality ...

  • Inverter-Based Low-Voltage CCII- Design and Its Filter Application 

    Hwang, Yuh-Shyan; Ku, Yi-Tsen; Chen, Jiann-Jong; Yu, Cheng-Chieh (Společnost pro radioelektronické inženýrství, 2013-12)
    This paper presents a negative type second-generation current conveyor (CCII-). It is based on an inverter-based low-voltage error amplifier, and a negative current mirror. The CCII- could be operated in a very low supply ...

  • IR Thermometer with Automatic Emissivity Correction 

    Dobesch, Ales; Poliak, Juraj (Společnost pro radioelektronické inženýrství, 2013-12)
    The paper describes the design and implementation of an infrared (IR) thermometer with automatic emissivity correction. The temperature measurement is carried out by the simple digital thermopile sensor MLX90614. The ...