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Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on

Date 4-7 May 2003

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Displaying Results 1 - 25 of 161
  • Source separation based on a double affine projection algorithm

    Publication Year: 2003, Page(s):2039 - 2042 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB) | HTML iconHTML

    In a variety of contexts, observations are made of the outputs of an unknown multiple-input multiple-output linear system from witch it is of interest to identify the system to recover its input signals. This often arises, for example, in adaptive noise cancellation (ANC), and in data communications in presence of cross-coupling effect between the transmission channels. We consider the separation ... View full abstract»

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  • Two-dimensional local discriminant basis algorithm for texture classification

    Publication Year: 2003, Page(s):2035 - 2038 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB) | HTML iconHTML

    Local discriminant basis (LDB) is known as a powerful and efficient feature extractor for signal classification. As LDB is based on wavelet transform it can effectively represent a nonstationary signal with a few number of significant coefficients. On the other hand the redundant orthogonal basis which comes with wavelet packet transform, makes it quite attractive for classification. In this paper... View full abstract»

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  • Antennas for wireless indoor millimeter-waves applications

    Publication Year: 2003, Page(s):1877 - 1880 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB) | HTML iconHTML

    The use of highly shaped-beam antennas in millimeter-wave for indoor wireless local area network (WLAN) may contribute to significantly enhance system performance. The antenna can be used for millimeter-wave equipment for cable-television (CATV), as well as terrestrial and satellite-broadcast systems. This paper describes the design and experimental results for the antenna at 62 GHz band. View full abstract»

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  • Improved strategy for adaptive rank estimation with spherical subspace trackers

    Publication Year: 2003, Page(s):2029 - 2034 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB) | HTML iconHTML

    An improved adaptive rank detection algorithm for on-line estimation and tracking of the signal subspace dimension in applications of spherical subspace trackers is presented. The proposed algorithm uses different adaptive thresholds for the rank increase (up) and decrease (down) tests as well as a special set of fast tracking eigenvalue estimates in the rank decrease test, which can be obtained a... View full abstract»

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  • Joint ownership verification for digital images

    Publication Year: 2003, Page(s):1937 - 1940 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB) | HTML iconHTML

    Many image watermarking schemes for copyright protection have been proposed in recent years, but they seldom deal with the problem of joint ownership verification if an image is created collaboratively. This paper addresses this problem by applying a secret sharing scheme to the watermarking scheme so that the secret key, which determines the embedded watermark, is shared among the multiple owners... View full abstract»

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  • A new back-to-back slot bow-tie antenna for millimeter-wave applications

    Publication Year: 2003, Page(s):1433 - 1436 vol.3
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB) | HTML iconHTML

    This paper presents a design and simulation results of back-to-back bow-tie slot antenna fed by a coplanar waveguide (CPW) to operate at Ka band around a center frequency of 38 GHz. The coupling from the coplanar line to the both slot radiating elements is accomplished via an aperture located within the ground plane to which the coplanar line is connected. This configuration provides omnidirection... View full abstract»

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  • Wireless water quality monitoring system based on field point technology and Kohonen maps

    Publication Year: 2003, Page(s):1873 - 1876 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB) | HTML iconHTML

    Designing and implementing a distributed measurement system for water quality (WQ) monitoring characterized by multiparameter measurement capabilities, wireless data communication, and advanced processing of data sensor based on auto-associative neural networks (Kohonen maps) is the aim of the work reported in the present paper. The WQ sensors considered are pH, temperature, conductivity and turbi... View full abstract»

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  • LPM-based RST invariant digital image watermarking

    Publication Year: 2003, Page(s):1951 - 1954 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (467 KB) | HTML iconHTML

    Based on log-polar mapping (LPM), this paper presents a novel digital image watermarking scheme that is invariant to rotation, scaling, and translation (RST). We embed watermark in the log-polar mapping (LPM) of the Fourier magnitude spectrum of original image to simplify the effects of RST transformations into simple shifts. For watermark embedding, the approximate ILPM is employed to replace ILP... View full abstract»

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  • Adaptive modeling of laser diode nonlinearity with memory

    Publication Year: 2003, Page(s):2025 - 2028 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB) | HTML iconHTML

    Direct modulation of laser diode in radio-over-fiber applications offers a cost effective solution compared to modulation by external devices. Laser diode nonlinearity is the biggest challenge, however, with direct modulation. Previous work has proposed adaptive pre/post compensation of laser diode nonlinearity based on a third order Volterra filter without memory. In this paper, the memory effect... View full abstract»

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  • An efficient resource reservation mechanism in ad hoc networks

    Publication Year: 2003, Page(s):1655 - 1658 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    In this paper, we propose an efficient resource reservation mechanism called the neighborhood reservation (NR) for ad hoc networks. When a node reserves bandwidth for a QoS flow, corresponding bandwidth reservation must be done in all its neighborhood nodes simultaneously to eliminate the impact on reserved bandwidth caused by channel contention. Thus the reserved bandwidth for the QoS flow can be... View full abstract»

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  • Video transcoding gateway for wireless video access

    Publication Year: 2003, Page(s):1775 - 1778 vol.3
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (438 KB) | HTML iconHTML

    In this paper, we review several typical video transcoding architectures and major applications of video transcoding. We identify issues involved in access video streams through handheld devices and wireless networks. To handle these issues, we propose a video transcoding gateway system for intelligently transcoding preencoded video for different user devices and network connections. The main func... View full abstract»

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  • Prototypes stability analysis in the design of fuzzy classifiers to assess the severity of scoliosis

    Publication Year: 2003, Page(s):1465 - 1468 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB) | HTML iconHTML

    The purpose of this paper was to develop and test a fuzzy classifier system to assess and monitor the severity of scoliosis. To design a reliable fuzzy classifier system, a notion of prototypes stability was introduced. Prototypes, which can be seen as representatives of information granules, need to be stable (i.e., they should not differ significantly in spite of small fluctuations occurring wit... View full abstract»

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  • Analysis of turbo decoders for UMTS systems

    Publication Year: 2003, Page(s):1693 - 1698 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB) | HTML iconHTML

    This article introduces channel coding in the 3G mobile communication system. The study relates initially to the conventional coding and is followed by a study on turbo code. A comparative study is carried out between convolutional coding and turbo coding and between different iterative coding algorithms (turbo coding). The study puts in evidence the contribution of the soft decoding methods (soft... View full abstract»

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  • A channel-based mobile-assisted fairly-shared packet scheduling scheme for nonreal-time applications in CDMA networks

    Publication Year: 2003, Page(s):1577 - 1580 vol.3
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    In this paper, we propose a fair packet scheduling scheme called CB+MA+FS for nonreal-time applications in a cellular CDMA network. Our research is motivated by the need to provide increased throughput in downlinks of a cellular CDMA system while ensuring fairness to users in terms of delivered throughput over time. The following packet scheduling schemes are investigated in this paper: channel ba... View full abstract»

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  • An optimal wavelet for raw SAR data compression

    Publication Year: 2003, Page(s):2071 - 2074 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    Synthetic aperture radar (SAR) is a sophisticated remote sensing tool that is capable of providing high resolution images from a moving platform. Due to the very poor correlation and high entropy of SAR raw data, redundancy reduction techniques have not proven successful and a lossy compression is necessary. In a previous work, we have presented a compression of the raw SAR signal using five kinds... View full abstract»

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  • A simple multiuser detector employing adaptive filters

    Publication Year: 2003, Page(s):1675 - 1678 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (542 KB) | HTML iconHTML

    Blind multiuser detection employs linear adaptive filters to produce a decision variable with improved signal to interference ratio. In this paper, we employ linear adaptive filters on each user's signal before the decision variables are input to either a decorrelator or a multistage detector to improve the bit error rate performance compared to simply using the decorrelator or multistage detector... View full abstract»

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  • A 5 GHz CMOS RF mixer in 0.18 μm CMOS technology

    Publication Year: 2003, Page(s):1905 - 1908 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB) | HTML iconHTML

    In this paper, we present in this paper a CMOS down-conversion double balanced mixer for 5 GHz radio applications. The mixer is derived from the basic Gilbert cell multiplier and has been implemented in a standard 0.18 μm CMOS technology. The proposed topology does not contain any tail current branches, but include on-chip bias circuit. It has been designed for low power highly integrated appli... View full abstract»

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  • A fast three-step search algorithm by the utilization of multilevel vector partial sums

    Publication Year: 2003, Page(s):1981 - 1984 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (330 KB) | HTML iconHTML

    Due to the high computational requirement of the full-search algorithm for block motion estimation, fast block motion estimation algorithms are needed for real-time implementations of the video coding standards. Recently, a three-step search algorithm for block motion estimation has been proposed in the literature. In this paper, a fast three-step search algorithm is proposed to further reduce the... View full abstract»

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  • Analysis of manuscript characters by the moments of wavelet packets

    Publication Year: 2003, Page(s):1933 - 1936 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (331 KB) | HTML iconHTML

    The extraction of characteristics is one of the principal components of all form recognition systems. This work relates to the use of wavelet moments as characteristics for the recognition of manuscript characters. We propose here new families and new methods of treatment of this type of characteristic. Encouraging experimental results were obtained: the most discriminating 39 characteristics amon... View full abstract»

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  • Joint deinterleaving/recognition of radar pulses

    Publication Year: 2003, Page(s):2009 - 2014 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB) | HTML iconHTML

    An electronic support measures (ESM) system consists of a passive radar receiver that receives and measures the monopulse parameters of pulses emitted by radars in its instantaneous view, and a deinterleaver that sorts these pulses and groups them into individual cells. The cell parameters are compared with those stored in the threat library of the electronic warfare (EW) system to identify the in... View full abstract»

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  • Nanoscale grid based positioning system for miniature instrumented robots

    Publication Year: 2003, Page(s):1831 - 1834 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB) | HTML iconHTML

    To position an autonomous wireless robot (NanoWalker) over a sample's single atom so it can be imaged or manipulated, a scanning tunnelling microscope (STM) is to be mounted on the robot itself. To do so a custom-built positioning system is developed. This requires the use of two sub-systems. The first to provide coarse positioning of the mobile unit in the micrometer range over a sample. To enabl... View full abstract»

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  • Performance evaluation of Bluetooth system in the presence of WLAN IEEE802.11 system

    Publication Year: 2003, Page(s):1633 - 1636 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB) | HTML iconHTML

    This paper uses the protocols of IEEE 802.15 (Bluetooth) and IEEE 802.11 wireless local area network (WLAN) to develop a Bluetooth radio system on an OPNET platform. Typically, this wireless model is an indoor model of the Bluetooth TM technology implemented in C programming language and assisted by a Matlab programming language. We evaluate the performance of voice in the presence of interference... View full abstract»

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  • Performance study of adaptive modulation/coding in MIMO-OFDM system

    Publication Year: 2003, Page(s):1559 - 1562 vol.3
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (409 KB) | HTML iconHTML

    MIMO/OFDM is one of the promising technologies to improve the spectral efficiency, enhance system capacity and mitigate intersymbol interference in the fourth generation broadband mobile communication system. In this paper, we aim at the study of a communication system that employs both MIMO-OFDM and adaptive modulation/coding technologies. In this article, the performance of different modulation ... View full abstract»

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  • Implementation of the model and synthesis of a law of control for commutation of compensators for a commercial aircraft

    Publication Year: 2003, Page(s):1753 - 1756 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB) | HTML iconHTML

    The object of this work is to conceive a control law for an autopilot of a commercial aircraft, valid for all flight envelopes. The control structure consists of commutating between various controllers according to the flying conditions of the aircraft. The control method used for the concept of individual controllers is the H{sub(infinity)} synthesis. For ensuring the commutations between the dif... View full abstract»

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  • Design of a novel two-element phased array for wireless applications

    Publication Year: 2003, Page(s):1429 - 1432 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (329 KB) | HTML iconHTML

    In this contribution, the design of a novel two-element phased array for mitigation of interference effects in digital mobile communications is presented. This new antenna system is designed for applications at the handset level. To control the phased array, a new version of on-off algorithm is developed and implemented. The phase array adaptation is blind since no priori knowledge of spatial sign... View full abstract»

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