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17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003.

1-3 Oct. 2003

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Displaying Results 1 - 25 of 109
  • Active suppression of electromagnetic fields using a MIMO antenna system

    Publication Year: 2003, Page(s):403 - 406
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1414 KB) | HTML iconHTML

    Active suppression of noise and vibrations is a well established field of research with many applications in acoustic and mechanical industries. In this paper we test some of these active control methods in order to assess their validity and performance when applied to electromagnetic fields. The application that we evaluated is a model of a mobile telephone equipped with one ordinary transmitting... View full abstract»

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  • Downlink transmitting array for indoor channel equalization

    Publication Year: 2003, Page(s):399 - 402
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1420 KB) | HTML iconHTML

    A smart antenna system for indoor base stations is proposed and its capabilities verified. The theory is derived using the reciprocity theorem and the radio channel equalization. It is shown that such an array can remove deep fades due to destructive multipath interference at the terminal antenna side. The proposed antenna array is tested on theoretical Rayleigh channel model as well as on measure... View full abstract»

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  • ICECom 2003-electromagnetic scattering analysis in indoor and outdoor environments by applying FDTD method

    Publication Year: 2003, Page(s):241 - 244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1692 KB)

    Economical and efficient means to obtain the characterization of radio channels have been investigated a lot since mobile communication devices became popular. So, this article presents solutions and results for two electromagnetic scattering problems: an outdoor environment simulation, solved by applying the two-dimensional FDTD formulation and an indoor environment radiation scattering simulatio... View full abstract»

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  • A new stopping rule for turbo decoders

    Publication Year: 2003, Page(s):95 - 98
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1421 KB) | HTML iconHTML

    The iterative decoding process to decode turbo codes is rather time consuming and stopping rules are applied to prematurely quit the process, for the decoder might have already reached a decision in an earlier iteration. In this paper we set up a new soft stopping rule based on probability density evolution of the extrinsic information. We adopted a model in which the evolution is expressed throug... View full abstract»

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  • Small multiband antenna for personal communications devices

    Publication Year: 2003, Page(s):395 - 398
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1471 KB) | HTML iconHTML

    The advent of new, multistandard mobile phone devices is a real challenge for antenna designers, as they have to implement integrated multiband within a volume, which is rapidly shrinking. In this paper, some investigations concerning the input return loss and current distributions of a novel internal, quadband patch antenna are presented. View full abstract»

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  • The convergence of genetic algorithms in GSM network optimization

    Publication Year: 2003, Page(s):91 - 94
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1406 KB) | HTML iconHTML

    This paper deals with the monitoring of the genetic algorithms convergence. GSM network parameters such as the radio channel and emitted power of the transmitters are the object of the optimization. Signal to noise ratio is the criterion of optimization. The best setting of the algorithm parameters has been looked for on the basis of many random trials. The probability of mutation and of crossover... View full abstract»

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  • Electromagnetic model for twin slot terahertz mixers

    Publication Year: 2003, Page(s):316 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1475 KB) | HTML iconHTML

    Twin slot antennas coupled to superconducting devices are currently being developed for terahertz mixers and direct detectors for astronomical observations. Although these mixers show promising performance in terms of noise temperature, they usually also show a considerable downward shift in the center frequency, especially when compared with calculations obtained with commonly used simplified mod... View full abstract»

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  • A stereo vision system for pedestrian navigation

    Publication Year: 2003, Page(s):30 - 33
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1438 KB) | HTML iconHTML

    In this paper we present the application of a stereo vision system for pedestrian navigation. Corner detection, stereo matching, triangulation, tracking, and robust ego-motion estimation are used to estimate incremental ego-motion of the stereo cameras with particular focus on implementation on pedestrians. A novel robust ego-motion estimation algorithm was utilized to eliminate outliers, which ar... View full abstract»

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  • BER performance of a receiver diversity scheme with channel estimation

    Publication Year: 2003, Page(s):87 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1340 KB) | HTML iconHTML

    The purpose of this paper is to analyze and determine analytically the BER (bit error ratio) performance for multiamplitude constellations with in-phase and quadrature components, thus avoiding the need for extensive, time-consuming computer simulations. This paper describes new theory approach, which leads to the original solution, for calculating the BER performance of a 1Tx-MRx "1 transmitter-M... View full abstract»

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  • BEYOND 3G radio technologies

    Publication Year: 2003, Page(s):387 - 390
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1391 KB) | HTML iconHTML

    Future wireless networks will provide mobile access anywhere and anytime, with a seamless integration of all available wireless and mobile technologies. Mobility management enables roaming and seamless handover between different wireless technologies, while maintaining security and quality of service aspects. The resulting technology will set a framework for the development of a next generation of... View full abstract»

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  • Theoretical cutoff frequencies in optical fiber using a variational technique

    Publication Year: 2003, Page(s):266 - 269
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB) | HTML iconHTML

    A numerical method for calculating the cutoff frequencies of modes in optical fibers with arbitrary refractive index profile is presented. Using a variational technique, the cutoff problem is transformed into a generalized eigenvalue problem whose eigenvalues are the cutoff frequencies. A similar variational technique has already been used for determining both the propagation constants and fields ... View full abstract»

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  • Analysis of conformal antennas using spectral domain approach

    Publication Year: 2003, Page(s):312 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1439 KB) | HTML iconHTML

    The purpose of the paper is to review the main ideas of spectral domain approach in analyzing conformal antennas. The main advantage of transforming the original problem in the spectral domain is that the original three-dimensional problem is reduced to a spectrum of one-dimensional problems. Therefore, the Green's functions needed for applying the moment method, as well as the elements of the mom... View full abstract»

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  • Design of a microstrip conform GPS patch antenna

    Publication Year: 2003, Page(s):201 - 204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1394 KB) | HTML iconHTML

    A design and investigation of a small conform microstrip GPS patch antenna is carried out. A cavity and TLM models are used to find the initial dimensions of the antenna. A NURBS model together with surface equivalence principle is applied for electromagnetic simulation of the antenna model with the FEKO® (C.A. Balanis 1997) moment method software. The antenna is tested experimental... View full abstract»

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  • Comparative study of JPEG and JPEG2000 image coders

    Publication Year: 2003, Page(s):109 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1418 KB) | HTML iconHTML

    The objective of this paper is to provide a comparison of JPEG and JPEG2000 image coders focusing on low bit rates. Coders are evaluated in rate-distortion sense. The influences of different image contents and compression ratios are assessed. Two picture quality measures are used: peak signal to noise ratio (PSNR) as traditional objective picture quality measure, and picture quality scale (PQS) as... View full abstract»

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  • A new approach to remote fiber testing in optical networks

    Publication Year: 2003, Page(s):278 - 281
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1433 KB) | HTML iconHTML

    A novel remote fiber testing system (RFTS) for error detection in optical networks is presented in this paper. The proposed measurement system is applicable to access and local optical networks for which the standard RFTS is too expensive. The basic idea lies in replacing expensive optical switches with more affordable optical power splitters. Consequently, all fibers are simultaneously tested and... View full abstract»

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  • The optimal link expansion in mobile satellite networks

    Publication Year: 2003, Page(s):26 - 29
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1413 KB) | HTML iconHTML

    Traffic from mobiles over satellite can be routed through different satellite links (if more than one satellite is visible) or through various channel types on the same satellite link. The efficient heuristic algorithm for sizing of N satellite capacity types (on the land Earth station side of the link) in mobile networks during exploitation is being developed, minimizing the total expansion cost.... View full abstract»

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  • Transmit-receive isolation in phased array antennas for duplex communication systems

    Publication Year: 2003, Page(s):360 - 365
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1492 KB) | HTML iconHTML

    In this paper we identify the generic coupling mechanism between transmit and receive channels in phased array antennas providing full duplex communication links to multiple users. The transmitter-to-receiver coupling degrades the receive S/N and produces unwanted spurious signals in the receive band. Both effects can be reduced to sufficiently low level by increasing isolation between the transmi... View full abstract»

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  • Analysis of monopole antenna by FDTD method using Beowulf cluster

    Publication Year: 2003, Page(s):437 - 440
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1386 KB) | HTML iconHTML

    As far as we are concerned, the implementation of the finite differences in the time domain (FDTD) method requires, for the solutions of several practical problems in electromagnetism, a long process time and a large amount of memory, what makes it impracticable in various cases, principally when the serial process is used. The current work deals with the conception of a Beowulf cluster and it aim... View full abstract»

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  • MM-wave meteoradars: development, design, and research data

    Publication Year: 2003, Page(s):13 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1505 KB) | HTML iconHTML

    A review is given of recent activities undertaken in the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine for the development of millimeter-wave meteorological radars. Both, 36 GHz and 95 GHz Doppler polarimetric radars have been developed and produced. The radars are capable to perform real-time, high-resolution measurements of various parameters of clouds and precipita... View full abstract»

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  • Energy limitation as method of electrical apparatus explosion protection

    Publication Year: 2003, Page(s):45 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1429 KB) | HTML iconHTML

    Hazardous areas are present in refineries, pharmaceutical industry, food industry, power plants, petrol stations, platforms and many other industries. Wherever it's possible, electrical apparatus should be mounted outside hazardous areas. If not so, adequate selection of explosion protected electrical apparatus and their proper installation is of the vital importance for the health of people in th... View full abstract»

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  • FDTD modeling and characterization of the indoor radio propagation channel in the 434 MHz ISM band

    Publication Year: 2003, Page(s):217 - 220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1422 KB) | HTML iconHTML

    In this paper the fundamental aspects of indoor radio propagation are presented and the possibility to characterize a dynamic channel by means of a static model based on the finite difference time domain method (FDTD) is examined. A 3D office environment is simulated in the 434 MHz ISM band for the characterization of channel operation according to the dominating distortions. The obtained results,... View full abstract»

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  • Novel telegrapher equations with radiation parameters for a double step microstrip discontinuity

    Publication Year: 2003, Page(s):83 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1411 KB) | HTML iconHTML

    In this paper, a new analysis for a double step microstrip discontinuity is presented by using a novel kind of telegrapher equations with radiation parameters. The new telegrapher equations are derived from circuit theory while equation coefficients are determined from full-wave numerical solutions. In comparison with the conventional telegrapher equations, the new equations have two additional te... View full abstract»

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  • Education in antennas-phased antenna arrays

    Publication Year: 2003, Page(s):383 - 386
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1422 KB) | HTML iconHTML

    The paper describes the new tasks related to the subjects taught at the department of the electromagnetic field. These tasks demonstrate the influences of supply amplitudes, supply phases, antenna element placement and antenna element parameters. View full abstract»

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  • Application of the finite-difference beam-propagation method to optical waveguide analysis

    Publication Year: 2003, Page(s):262 - 265
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1408 KB) | HTML iconHTML

    The finite-difference beam-propagation method (BPM) is applied to the eigenmode, propagating beam and time-domain analyses of optical waveguides. First, the eigenmode of a bent waveguide is calculated with the aid of the imaginary-distance procedure. Second, the wavelength demultiplexer based on the multimode interference coupler is investigated through the propagating beam analysis. Finally, a wa... View full abstract»

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  • Comparison between different types of green's function factorization for the BMIA/AIM method

    Publication Year: 2003, Page(s):308 - 311
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1383 KB) | HTML iconHTML

    Three different formulations that allow to extend the BMIA/AIM method to the analysis of large dielectric stratified structures are introduced. These techniques lead to an approximate form of the multilayer Green's function, valid in the region where the thickness of the substrate can be considered small compared to its transverse dimension. This approximate form results as the product of three te... View full abstract»

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