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

19-21 May 1993

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  • Torus-ring-bus connected highly parallel processor

    Publication Year: 1993, Page(s):394 - 397 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A cluster structure interconnection network for massively parallel computers is proposed. Each processor is connected to a one-dimensional ring-bus network in a cluster, and each cluster is connected to a two-dimensional torus network. Basic network performance is estimated by software simulations for two communication patterns, namely, nearest neighbor communication and general communication. The... View full abstract»

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  • Efficient design of recursive filters satisfying prescribed magnitude and phase specifications

    Publication Year: 1993, Page(s):398 - 401 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A method for the design of recursive filters satisfying prescribed specifications using a least-squares approach is presented. In this method, a weighted mean-square error based on the difference between desired and actual frequency responses is formulated in a quadratic form. Quadratic programming is employed wherein the constraint on stability is accommodated. The proposed method is compared wit... View full abstract»

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  • A self-timed approach to VLSI digital filter design

    Publication Year: 1993, Page(s):402 - 406 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A request-acknowledge protocol is normally used for self-timed digital design. The two major philosophies for such a protocol are two-cycle and four-cycle. Data flow graphs have seven primitives. The design of these primitives for both two-cycle and four-cycle protocols is presented. Results of simulations of a multirate comb filter used as a decimator for both of these schemes are also presented.... View full abstract»

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  • A method of extracting 3D patch information from object in image sequences: Volume Editor

    Publication Year: 1993, Page(s):630 - 633 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A method for the extraction of 3-D patch information from an object in image sequences on a VTR is proposed. The stationary object is filmed on the VTR. The system, in cooperation with a human operator, helps to estimate 3-D patch information of the object accurately and flexibly. The 3-D patch information of the object is expressed as both a rough 3-D shape and fine 2-D texture in the object imag... 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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  • The equivalents of Schur-Cohn minors for delta-operator formulated discrete-time systems

    Publication Year: 1993, Page(s):407 - 410 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The author presents certain quantities that may be regarded as Schur-Cohn minors applicable to δ-system characteristic polynomials. For this purpose, a recently introduced tabular method for stability checking of δ-systems is extended to the complex coefficient case. The results presented pave the way for developing effective algorithms for stability checking of two-dimensional and mul... View full abstract»

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  • A modeling technique for the recognition and attitude estimation of 3-D objects

    Publication Year: 1993, Page(s):634 - 637 vol.2
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A novel method for rapid identification and 3-D attitude determination of polyhedral objects is presented. A least set of 2-D projections called the distinct view set is used to represent the 3-D object. For each distinct view, a shape descriptor with multiple levels of abstraction is used, making the method robust when the input image is noisy View full abstract»

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  • Empirical assessment of 1.7 GHz micro-diversity in various buildings

    Publication Year: 1993, Page(s):582 - 585 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    To achieve reliable radio communications inside buildings, microdiversity is required to mitigate the severe multipath and temporal fading. The authors present results of diversity measurements from 100 locations in four university buildings. They computed cumulative distribution functions (CDFs) of the envelope fading statistics for space, frequency, and space/frequency (hybrid) diversity. CDFs f... 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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  • Digital phase-locked loop with wide lock-in range using fractional divider

    Publication Year: 1993, Page(s):431 - 434 vol.2
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors propose a novel type of digital phase-locked loop (DPLL) with both a wide initial lock-in range and a fast initial acquisition time. In this DPLL, by using a fractional divider, it is possible for an initial fixed clock to be made as the adapting free-running frequency which is dependent on the input frequency. Therefore, one can obtain a wide initial lock-in range. Furthermore, removi... 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 (1)
    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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  • Object oriented knowledge representation and its applications in concurrent design

    Publication Year: 1993, Page(s):638 - 641 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A novel knowledge representation based on a combined logic and object oriented programming method is presented. The method is developed to provide both symbolic reasoning and numerical calculation functions for concurrent engineering design. In the concurrent design applications, the design, manufacturing, and geometry information about an object is represented and maintained using the symbolic re... View full abstract»

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  • An investigation of an adaptive modeling algorithm for magnetic resonance image reconstruction

    Publication Year: 1993, Page(s):586 - 588 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    For estimating the AR (autoregressive) parameters from nonstationary MR (magnetic resonance) data, the authors introduce an algorithm with an adaptive mechanism, which attempts to follow the statistical variation of the data. Medical and material MR images reconstructed using the LSL (least-squares lattice) algorithm were more stable than the original nonadaptive TERA (transient error reconstructi... View full abstract»

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  • A new atmospheric noise model and its implementation in a real-time signal processing system

    Publication Year: 1993, Page(s):478 - 483 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The Institute for Telecommunication Sciences has developed a new wideband high-frequency (WBHF) propagation model and new WBHF narrowband and atmospheric noise models. The author describes the atmospheric noise component of the WBHF Simulation System and its implementation in a commercially available digital signal processing (DSP) board. The system employs a comprehensive design that permits sign... View full abstract»

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  • A memory ARQ scheme with soft decision and low reliability zone detectors

    Publication Year: 1993, Page(s):435 - 438 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The performance improvement of a memory ARQ (automatic repeat request) scheme using soft decision and reliability zone detectors is analyzed. A number of probable error patterns are generated whenever a packet is detected in error. The formation of the error patterns is governed by the reliability weights assigned to the received bits. It is shown that the probability of repeat request is signific... View full abstract»

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  • Performance analysis of (m, 2) MPPM with imperfect slot synchronization

    Publication Year: 1993, Page(s):765 - 768 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The performance of MPPM (multipulse pulse position modulation) consisting of m slots and 2 pulses ((m, 2) MPPM) with imperfect slot synchronization is analyzed. The authors assign the optimum symbol sets of (m, 2) MPPM minimizing symbol error probability in the presence of timing error, and the bit error probability of (m, 2) MPPM is evaluated. The bit error probability of (m, 2) MPPM is compared ... View full abstract»

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  • A scheduling advisor for distributed systems

    Publication Year: 1993, Page(s):459 - 462 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    An adaptive scheduling advisor is proposed for computing resource management in distributed systems by providing a means for optimal mapping of an application onto the system. To make its decision, the scheduling advisor uses the job information, a detailed description of the system, and current dynamic parameters. The decision-making process is controlled by a set of scheduling heuristics, a simp... View full abstract»

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  • Design considerations for very low sensitivity and very low round-off noise recursive digital filters

    Publication Year: 1993, Page(s):415 - 418 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Sensitivity and round-off noise expressions for recursive fixed point digital filters are presented. These expressions can be used as design aids for the design of low-sensitivity and low-round-off noise recursive digital filters. The sensitivity and round-off noise analysis is carried out for four recursive topologies claimed to be low-sensitivity and/or low-round-off-noise topologies. The result... 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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  • A method for extracting feature parts from CT-images of skull based on state transition model

    Publication Year: 1993, Page(s):589 - 593 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A system for extracting characteristic bone regions, i.e., feature parts, from X-ray CT (computed tomography)-images (slices) of the human head is proposed. Such feature parts form regions of complex shapes and locations. Thus, to realize the system, a state transition model of the skull is first proposed, taking account of the topology of sliced skull shapes. Next, a sliced skull shape is recogni... View full abstract»

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  • Algorithm of defining 1-D indexing for M-D mixed radix FFT implementation

    Publication Year: 1993, Page(s):484 - 488 vol.2
    Cited by:  Papers (3)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A novel M-D (multidimensional) to 1-D FFT (fast Fourier transform) signal flow graph mapping is proposed. Thus, the M-D FFT can be efficiently implemented by the unified 1-D indexing, and the address generator design can be simplified. In addition, the matrix transposition is no longer necessary. The addressing sequences can be derived from the factorization of the twiddle factor matrix. The unifi... View full abstract»

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  • Vision-based product quality determination in a hierarchical system for fish processing

    Publication Year: 1993, Page(s):710 - 713 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A vision-based methodology for the assessment of the quality of fish products, processed salmon in particular, is discussed in the context of a hierarchical system for product quality monitoring and control. Application of the techniques to an automated fish processing workcell is described. A suitable definition of quality in food products is discussed, and the concept of indicative parameters of... 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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  • CHIP in plain logic

    Publication Year: 1993, Page(s):742 - 746 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The programming language Prolog allows succinct representation of a wide variety of scheduling problems. To speed up execution, a new version called CHIP (Constraint Handling In Prolog) was introduced that maintains the programming advantages of Prolog. CHIP achieves its speed by keeping track of the sets of possible values for each variable. In this way, a search can be abandoned as soon as any s... View full abstract»

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  • Analysis of capacity improvement factor in cellular CDMA radio network using forward error correcting coding

    Publication Year: 1993, Page(s):439 - 442 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A general, simple expression for the improvement factor is derived, and some numerical examples are presented for a given set of FEC codes. It is shown that BCH (n, k) codes can provide up to 50% capacity improvement if quite a long code, e.g., (511,259), is used for error rate 10-3. At the same bit error rate level, convolutional codes with Rc = 1/3 and constant length K = 8... View full abstract»

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