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1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)

22-24 Aug. 1999

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  • 1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)

    Publication Year: 1999
    Request permission for commercial reuse | PDF file iconPDF (584 KB)
    Freely Available from IEEE
  • Author's index

    Publication Year: 1999, Page(s):0_3 - 0_5
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    Freely Available from IEEE
  • Client mobility and fault tolerance in a distributed network data system

    Publication Year: 1999, Page(s):593 - 596
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    As wireless and ubiquitous computing become increasingly affordable and widespread, traditional client-server models for distributing data fail to offer the flexibility needed in mobile computing environments. Although systems have been proposed to address these concerns, most rely on changes to existing infrastructures. The article describes a server hierarchy that uses currently available resour... View full abstract»

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  • A multi-channel digital receiver for intrapulse analysis and direction-finding

    Publication Year: 1999, Page(s):589 - 592
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A multi-channel digital receiver architecture is studied and its performance is analyzed for electronic warfare applications. It is found that this architecture has excellent performance for the intrapulse analysis and direction-finding of radar signals. Three unique features are identified: (a) both AOA and intrapulse information can be extracted from the same data set; (b) improvement in the qua... View full abstract»

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  • Impact of power control error on PN acquisition performance for a code-division-multiple-access system

    Publication Year: 1999, Page(s):584 - 588
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    In this paper, the impact of power control error on PN acquisition performance is evaluated for a CDMA system in a fading channel. A parallel acquisition scheme is adopted since it achieves faster acquisition than serial acquisition schemes. Acquisition performance is evaluated in terms of mean acquisition time, and acquisition-based capacity is discussed. It is shown that the imperfect power cont... View full abstract»

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  • Influence of shear, rotary inertia on the dynamic characteristics of flexible manipulators

    Publication Year: 1999, Page(s):615 - 618
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The influence of shear, rotary inertia on the dynamic characteristics of flexible manipulators is studied through frequency analysis. In terms of the various geometric effects, dynamic models of flexible manipulators are set up and characteristic equations are derived. By using the analysis, the influences of shear, rotary inertia, axial force on the flexible manipulator are given View full abstract»

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  • End-system architecture for distributed networked multimedia applications: issues, trends and future directions

    Publication Year: 1999, Page(s):452 - 455
    Cited by:  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The emerging broadband computer networks (wired and wireless) are likely to have numerous multimedia applications, such as videoconferencing, interactive games, and collaborative computing standard features in desktop PCs and portables. In recent years there have been significant developments in the field of multimedia coding algorithms and their VLSI implementations along with the development of ... View full abstract»

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  • An efficient frequency offset estimator for timing and frequency synchronization in OFDM systems

    Publication Year: 1999, Page(s):580 - 583
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    In this paper, by modifying a conventional method which requires two training symbols, we propose a timing and frequency synchronization algorithm for OFDM systems which requires one training symbol. While the frame/symbol timing is obtained by using the conventional method, the carrier frequency offset is efficiently estimated by the proposed method. Key features of the proposed method are presen... View full abstract»

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  • Predetection macrodiversity in DS/CDMA asynchronous systems

    Publication Year: 1999, Page(s):507 - 510
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    In this paper we analyze the application of macrodiversity techniques in the predetection side of the link for CDMA systems, and specifically, for asynchronous systems with linear detection. We propose a simple combining strategy that improves the selection combining and we compare the bit error probability and the outage probability of both techniques View full abstract»

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  • Neural network application in robot motion planning

    Publication Year: 1999, Page(s):611 - 614
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The application of neural networks to real-time motion planning of robotic systems is studied. The proposed framework, using biologically inspired neural networks, for robot motion planning with obstacle avoidance in a nonstationary environment is computationally efficient. The neural dynamics of each neuron in the topologically organized neural network is characterized by a simple shunting equati... View full abstract»

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  • Dynamic multimedia integration with the WWW

    Publication Year: 1999, Page(s):448 - 451
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    This paper presents a novel framework for seamlessly integrating continuous media, such as audio and video, with the World Wide Web (WWW). Continuous Media with the Web (Cmew) enhances the interactivity of continuous media by associating hyperlinks with spatial-temporal parts of the media. The scenario control architecture in Cmew provides flexible and dynamic control over continuous media in mult... View full abstract»

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  • A new DS/CDMA code acquisition scheme for reducing the effect of residual code phase offset

    Publication Year: 1999, Page(s):576 - 579
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    When the code phase offset between two sequences is within one chip duration, the sum of two successive matched filter outputs has a constant value regardless of the residual code phase offset if the noise is absent. Based on this observation, we propose a new code acquisition scheme, which is robust to the variation of the residual code phase offset and outperforms the conventional scheme. Numeri... View full abstract»

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  • DS-CDMA systems with polyphase signature sequences in multipath fading channel

    Publication Year: 1999, Page(s):503 - 506
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Direct sequence code division multiple access (DS-CDMA) communication systems using random polyphase sequences with coherent reception in multipath fading channels are considered. By examining the asymptotic characteristics of the multiple access interference and multipath interference, we show that the DS-CDMA system performance with random mp-phase sequences of mp⩾3 is ... View full abstract»

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  • A queue growth rate based flow control algorithm

    Publication Year: 1999, Page(s):357 - 360
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    In this paper, we propose a queue growth rate based explicit rate (QGER) feedback flow control algorithm for ABR flow control in ATM networks. The novel characteristics in QGER are: (1) considering the link input rate and queue growth rate simultaneously to determine the traffic load, the congestion status and the fair share of available bandwidth; (2) monitoring the link input rate at the egress ... View full abstract»

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  • A survey of representations for multidimensional linear systems: the extra term

    Publication Year: 1999, Page(s):608 - 610
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A central role in the theory of discrete-time linear systems is played by the idea that every such system has an input-output map that can be represented by a convolution or the familiar generalization of a convolution. This thinking involves an oversight that was previously corrected by adding an additional term to the representation. A need for an additional term arises also in connection with r... View full abstract»

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  • Service-PlugIn mechanism for distributed application system

    Publication Year: 1999, Page(s):540 - 543
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    We assume that an application system may be constructed from: scenario, role, and function. In our proposed architecture (Y. Sakashita et al., 1999), the business flow is defined by scenario, which is constructed from activities based on role. Each role has a mission whose aim is to sub-goal with an approach of its own. It needs to accomplish the sub-goal so that the system gets suitable execution... View full abstract»

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  • A WWW server with media scaling mechanism based on page transmission latency

    Publication Year: 1999, Page(s):444 - 447
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Today, billions of users use the Internet to access multimedia information on the World Wide Web (WWW). Most users, however, are given low-speed connection to the Internet and are often irritated by the long transmission time of WWW pages. Therefore, it is very important for information providers to tailor the presentation of information to a user's network environment. In this paper, we propose a... View full abstract»

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  • Crosstalk in ultra-high-speed VLSI interconnects due to substrate-conductivity, temperature, and line-length effects

    Publication Year: 1999, Page(s):173 - 176
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Effects of substrate-conductivity, temperature, and line-length on crosstalk along ultra-high-speed VLSI interconnects are investigated. Results indicate that the crosstalk does not decrease monotonically with increasing linespacing and also the crosstalk tends to be more oscillatory when the line-length is increased. The crosstalk amplitude is significantly changed when temperature is varied betw... View full abstract»

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  • A new method for maintaining semi-structured data described in XML

    Publication Year: 1999, Page(s):258 - 261
    Cited by:  Papers (1)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    XML is a markup language for describing structured documents. Moreover, it has the capability to effectively represent semi-structured data. XML is expected to be widely used for exchanging semi-structured data over networks. In this paper, we study and propose a new method for maintaining a database of XML documents that can be queried for retrieval based on structure and content. Our method impr... View full abstract»

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  • Adaptive equalization for partially bandwidth-occupied ADSL transceivers

    Publication Year: 1999, Page(s):572 - 575
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A new optimization criterion for the design of a time-domain equalizer in asymmetric digital subscriber line systems is studied. It is shown that the new criterion maximizes the signal-to-noise ratio regardless of the profile of bandwidth occupancy. Based on the fact that the solution of the optimization problem is unique, two adaptation algorithms are developed in the time and frequency domains, ... View full abstract»

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  • Embedded memory in FPGAs: recent research results

    Publication Year: 1999, Page(s):292 - 296
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Recent dramatic improvements in integrated circuit fabrication technology have led to field-programmable gate arrays (FPGAs) capable of implementing entire digital systems. Unlike the smaller circuits that have traditionally been targeted to FPGAs, these large systems often contain memory. Architectural support for the efficient implementation of memory in next-generation FPGAs is therefore crucia... View full abstract»

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  • Real-time image segmentation for action recognition

    Publication Year: 1999, Page(s):86 - 89
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    In order to recognize actions of a human properly, an algorithm must be able to detect a person accurately in any given image. This data will be used to ascertain what action the user is performing. Many methods have been proposed that use a difference picture technique in which the image of the user is subtracted from a previously known image with the same background, without the user. These meth... View full abstract»

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  • Wavelet-packet-based signatures for asynchronous CDMA systems

    Publication Year: 1999, Page(s):499 - 502
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A wavelet-packet-based family of user signatures for asynchronous CDMA systems is investigated. These signatures are of non-binary nature and are generated by the application of the inverse wavelet packet transform. Through numerical optimization, we obtain the wavelet filter which minimizes the crosscorrelation among signatures for different user configuration systems. The improvement in performa... View full abstract»

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  • MELP vocoder using lifting wavelet transform

    Publication Year: 1999, Page(s):392 - 395
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A MELP (mixed excitation linear prediction) vocoder produces much improved voice quality compared with the traditional LPC vocoder. An LPC synthesis filter which mimics the vocal tract characteristics is excited with a mixture of pulse and noise instead of using either of them. This paper describes an implementation of the MELP vocoder which uses the lifting wavelet transform in place of the band-... View full abstract»

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  • Computation/communication balance-point modeling in multiprocessors

    Publication Year: 1999, Page(s):141 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    An analytic model for predicting processor utilization in a CC-NUMA (cache coherent non-uniform memory access) shared-memory multiprocessor is developed. The interconnection network in such systems transfers cache line messages between processor caches and memory modules on read and write misses. The major component of the miss penalty, for the case of large systems, is the network delay. Using on... View full abstract»

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