Proceedings of IEEE Pacific Rim Conference on Communications Computers and Signal Processing

19-21 May 1993

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  • A congestion control mechanism for interconnected high-speed networks

    Publication Year: 1993, Page(s):557 - 560 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A novel congestion control mechanism is proposed for a system consisting of a high-speed backbone network connecting low-speed LANs (local area networks). The main goal has been to define a fair and simple congestion control mechanism. A performance study of this control mechanism is carried out. The authors are mainly interested in evaluating the packet loss probability and delay as a function of... View full abstract»

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  • Fast data communication for scalable distributed shared-memory parallel computer hyper-KORP

    Publication Year: 1993, Page(s):382 - 385 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A loosely coupled ring-connected parallel processing system (called KORP: Kobe University Ring-connected Parallel Computer) with distributed shared-memory is being developed. The high-speed communication in KORP is performed by the exclusive data transmission hardware called Stream Controller (SC). The consistency of shared data is maintained by a coherence-protocol controller which is a dedicated... View full abstract»

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  • A novel detection technique for CPM using variable mapping method

    Publication Year: 1993, Page(s):573 - 576 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A variable mapping method for CPM (continuous phase modulation) is proposed in which the data symbols are decided by both the data bits and the accumulated phase states in order to simplify the detection. The author consider two schemes, 1REC and 1RC, and evaluate these schemes in terms of simplification of detection and error performance. It is found that the receiver for CPM can detect symbol-by... View full abstract»

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  • Data transfer interface design in DAME

    Publication Year: 1993, Page(s):510 - 513 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The authors discuss the component model and interface design procedure for data transfer in DAME (Design Automation of Microprocessor based systems, using an Expert system approach), a system in development that will be capable of producing the complete design from an original system specification, such as the type of application, cost, processing requirements, and power consumption. Signal connec... View full abstract»

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  • Comparison of four parallel algorithms for systolic array processing

    Publication Year: 1993, Page(s):666 - 669 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Four parallel algorithms for solving least square estimation problems are studied. They are the recursive modified Gram-Schmidt (RMGS) algorithm, the a priori error recursive modified Gram-Schmidt (PERGS) algorithm, and the Given rotation with and without using square root operator (GRWSR and GRWOSR) algorithms. These algorithms based on orthogonal transformation provide a complete solution to the... View full abstract»

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  • Non-ideal power control in DS-CDMA cellular

    Publication Year: 1993, Page(s):686 - 689 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    An exponential form of non-ideal power control in the reverse links of a CDMA (code division multiple access) cellular network is presented. It is shown that there exists an optimum non-ideal power control system which leads to an increased capacity of the cellular system. This kind of non-ideal power control might also be called soft-limiting power control View full abstract»

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  • MACS: An efficient multicast mechanism for radiopacket communication among multiple mobile robots

    Publication Year: 1993, Page(s):561 - 564 vol.2
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A novel radio communication mechanism, called MACS (mechanism of acknowledgment using multicast), is proposed. It supports a group communication facility in an environment of autonomous mobile robots, i.e., a particular open and distributed dynamic computer network. Since many computers may participate in group communication in such environments, the bounds of the communication bandwidth become a ... View full abstract»

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  • Use of image processing in the development of a dynamic model for fish processing

    Publication Year: 1993, Page(s):706 - 709 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The development of a finite element model of the fish-machine interactions is required for the analysis of parameters which affect the performance of a fish processing machine. Standard image processing techniques are used to determine the geometric parameters necessary to build the model, and to verify the simulation results. The image processing techniques are tested on Pacific salmon, and are i... View full abstract»

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  • A performance analysis for the arbitor of IEEE standard backplane bus Futurebus/Futurebus+

    Publication Year: 1993, Page(s):386 - 389 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The arbitration protocols of the IEEE Futurebus and Futurebus+ are analyzed with both a theoretical model and a real machine. Some problems are found in the fairness scheme on Futurebus View full abstract»

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  • Automatic identification of noises for an optimal filtering

    Publication Year: 1993, Page(s):474 - 477 vol.2
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The author proposes a method which allows detection of the additive, multiplicative, or impulsive nature of noise by decision criteria from the degraded image. This method is based on the analysis of local variations of the average and of the standard deviation estimated on the homogeneous regions of the observed image. In the case where additive or multiplicative noise is detected, its statistica... View full abstract»

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  • Correlated lognormal interferers and outage probabilities

    Publication Year: 1993, Page(s):577 - 581 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Three approaches that can be used to compute the distribution of a sum of correlated lognormal RVs (random variables) are investigated. Specifically, Wilkinson's approach, an extension of Schwartz and Yeh's approach, and a cumulants matching approach are investigated, and their accuracies are compared. These techniques are then used to compute the outage probability of a desired lognormal shadowed... View full abstract»

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  • Modeling and manipulating building designs

    Publication Year: 1993, Page(s):514 - 517 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Some preliminary work done on the Architectural Design Assistant is presented. The function and structure of the Design Assistant are presented along with some of the motivation behind its development. A building design model as well as its manipulation is discussed. The role of the National Building Code of Canada is outlined, and an example of how this code is incorporated into the Design Assist... View full abstract»

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  • On the use of Fourier transform with acoustical fields

    Publication Year: 1993, Page(s):726 - 729 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The authors present a theoretical introduction to the possibility of using the Fourier transform to study the fields produced by distributions, either continuous or discrete, of acoustic source distributions. With this approach one can develop and simplify methods of analysis and synthesis of fields produced by acoustic sources. The procedure is based on the theorem of the small complex translatio... View full abstract»

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  • Statistical pattern recognition for cutter positioning in automated fish processing

    Publication Year: 1993, Page(s):786 - 789 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors present an application of computer vision and pattern recognition techniques to the problem of estimating a reference position for a robotic cutter used in the head removal stage of automated fish butchering. The image processing techniques used to locate the necessary features on the body of the fish are discussed. The performance of reference point estimation using multiple regressio... View full abstract»

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  • In orbit measurements of satellite communication payload

    Publication Year: 1993, Page(s):670 - 673 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    After the successful launch of a communication satellite, a series of measurements is performed to verify and identify if any of the performance parameters are degraded or changed. The results of these tests are a valuable database during the life of the satellite for traffic studies and for future anomaly investigations. The authors describe the satellite communications payload in-orbit test faci... View full abstract»

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  • One-shot signal detection in asynchronous CDMA systems

    Publication Year: 1993, Page(s):690 - 693 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    One-shot multiuser detectors in asynchronous CDMA (code division multiple access) systems are studied. This type of detector is shown to be near-far resistant, although only parts of the interfering symbols are estimated to conduct the multiuser detector for the desired signal. Performance of the one-shot detectors usually depends upon the delay distribution of users, which may result in some perf... View full abstract»

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  • Design support through information systems

    Publication Year: 1993, Page(s):642 - 645 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors address some speculations on the extent to which design of products and systems may be enhanced by integrative information systems. The premise is put forth that information is the currency of design and it follows that the degree to which information retrieval, communication, and processing can be facilitated will reflect the potential advantages accruing to the process of design. It ... View full abstract»

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  • An adaptive digital technique for compensating for analog quadrature modulator/demodulator impairments

    Publication Year: 1993, Page(s):447 - 450 vol.2
    Cited by:  Papers (20)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Analog quadrature modulators and demodulators have three major impairments: gain imbalance, phase imbalance, and dc-offset. A digital technique is presented for compensation of these modulator and demodulator impairments. Part of the RF signal is fed to an envelope detector. The detector output, along with the baseband quadrature components, is used to estimate the impairment values. The estimated... View full abstract»

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  • A fast polynomial interpolation for Remez exchange method

    Publication Year: 1993, Page(s):411 - 414 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The computational complexity of several algorithms for polynomial interpolation is quantitatively evaluated. There are four well-known algorithms for obtaining the interpolation polynomial. The first algorithm is to solve simultaneous equations for coefficients of the polynomial (the most basic one). The second is Lagrange's interpolation algorithm (the classical one used widely). The third is Lag... View full abstract»

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  • Formal protocol design using partial constraints

    Publication Year: 1993, Page(s):549 - 552 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Formal design of communication protocols using partial constraints is presented. Partial constraints are modal logic formulae constructed from requirements, using three basic connectives: the nondeterministic "or" the "precedence" and the "followed by" operator. Every formula is satisfied by a class of related behaviors. Partial specifications satisfy those partial constraints from which they are ... View full abstract»

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  • Maximum likelihood decoding of coded digital signal in frequency selective fast fading channels

    Publication Year: 1993, Page(s):565 - 568 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The maximum likelihood sequence estimation (MLSE) receiver is derived for coded digital signals transmitted over frequency-selective fast Rician fading channels. The derivation is general enough to accommodate single as well as multilevel signals. For the channel model the authors have adopted the TIA (Telecommunications Industry Association) standard 2-ray model with both direct and reflected sig... View full abstract»

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  • Bayesian probabilistic reasoning in design

    Publication Year: 1993, Page(s):501 - 504 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The application of Bayesian reasoning to engineering design is discussed. The decisions involved in the design process can be represented as nodes in a Bayesian network. The conditional probability that a child node in this network will take a desired value, given the values of its parents, can be estimated from a database built up from simulations of past designs, or from suitably encoded empiric... View full abstract»

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  • Mobility based scheduling for the register-transfer synthesis of systolic arrays

    Publication Year: 1993, Page(s):657 - 661 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The authors present a novel scheduling and allocation algorithm for both one- and two-dimensional SUs (systolic units). This algorithm works across the PEs (processing elements) of an SU to reduce the number of FUs (functional units) required in an implementation. For the examples presented this technique results in fewer FUs and latches than if individual PEs were synthesized and then combined in... View full abstract»

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  • Applications of mapping concepts to multi-robot collision avoidance and task plan execution

    Publication Year: 1993, Page(s):466 - 469 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The authors present techniques developed for real-time monitoring of assembly operations and detection of errors due to parts mishandling such as incorrect parts manipulation, insertion, and placement in the workspace or due to interference between robots sharing the workspace. Two-dimensional maps are created by adaptively projecting the typically three or more dimensional assembly problems to a ... View full abstract»

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  • CAD modeling of SAW filters in mobile communication systems

    Publication Year: 1993, Page(s):718 - 721 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Surface acoustic waves (SAWs) propagating in anisotropic and piezoelectric substrates have been investigated. The mass- and stress-loading effect, caused by two different isotropic and metallic films with finite thickness, is exactly taken into account by analyzing the multilayered structure. The mass density and the elastic stiffness constants of the metallic layers are determined by fitting calc... View full abstract»

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