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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms, Architectures, and Implementations X"

共 462 条记录，以下是371-380 订阅

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CUMULANT BASED STATIONARY AND NONSTATIONARY MODELS FOR CLASSIFICATION AND SYNTHESIS OF RANDOM-FIELDS

CUMULANT BASED STATIONARY AND NONSTATIONARY MODELS FOR CLASS...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： ZHOU, GT GIANNAKIS, GB Univ. of Virginia (United States)

ISBN: (纸本)081940943X

Cumulants are employed for classification and synthesis of textured images because they suppress additive Gaussian noise of unknown covariance and are capable of resolving phase and causality issues in stationary non-Gaussian random fields. Their performance is compared with existing autocorrelation based approaches which offer sample estimates of smaller variance and lower computational complexity. Nonlinear matching techniques improve over linear equation methods in estimating parameters of non-Gaussian random fields especially under model mismatch. Seasonal 1-D sequences allow for semi-stationary 2-D models and their performance is illustrated on synthetic space variant textures. The potential of prolate spheroidal basis expansion is also described for parsimonious nonstationary modeling of space variant textured images.

关键词： Autoregressive models Image classification Statistical analysis Image segmentation Statistical modeling Image processing signal to noise ratio Performance modeling Radon signal processing

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TIME-VARYING POLYSPECTRA AND REDUCED WIGNER-VILLE TRISPECTRUM

TIME-VARYING POLYSPECTRA AND REDUCED WIGNER-VILLE TRISPECTRU...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： BOASHASH, B RISTIC, B Queensland Univ. of Technology (Australia)

ISBN: (纸本)081940943X

This paper consists of two parts. The first part reviews a class of higher-order Wigner-Ville distributions projected onto a single frequency axis. This class is referred to as polynomial Wigner-Ville distributions (PWVDs). For random processes, the expected value of PWVDs represent time-varying higher-order moment spectra. The second part defines and studies a particular member of a class of time-varying higher-order spectra based on PWVDs, namely a reduced Wigner-Ville trispectrum (RWVT). This novel time-frequency representation is shown to be a very efficient tool for analysis of FM signals affected by Gaussian amplitude modulation. In the paper, we present a statistical comparison of the RWVT and WVD based instantaneous frequency estimates for linear FM signals in absence and in presence of multiplicative noise. For multicomponent signals, the RWVT has to be re-defined and calculated in the full multi-lag domain.

关键词： Fermium Frequency modulation Interference (communication) signal to noise ratio Time-frequency analysis Modulation signal processing Statistical analysis Amplitude modulation signal analyzers

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IMPLEMENTING THE VITERBI ALGORITHM ON GENERAL-PURPOSE PARALLEL COMPUTERS

IMPLEMENTING THE VITERBI ALGORITHM ON GENERAL-PURPOSE PARALL...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： ALSTON, MD CHAU, PM CHEUNG, KM Univ. of California/San Diego (United States) Jet Propulsion Lab. (United States)

ISBN: (纸本)081940943X

The Viterbi algorithm (VA) for decoding convolutionally encoded data has historically been implemented on special-purpose digital electronic hardware. For short/moderate (K equals 3 to 9) constraint length codes, a primary design goal is to maximize the decoded bit rate while minimizing circuit area. In recent years, a number of special-purpose architectures based upon shuffle-exchange networks, cube-connected cycles, ring-based networks, systolic arrays, or programmable processors have been designed for efficient implementation of the VA at these and longer constraint lengths. However, at the same time, the performance:cost ratio of high- end general-purpose computing machines has been improving dramatically. Recognizing the substantial investment in time and resources required to design and build an ASIC-based decoder for long (K equals 10 to 15) constraint length codes, the feasibility of implementation of the VA as a background process on a readily available general-purpose parallel processing machine deserves exploration. We consider the limitations and benefits of a Viterbi decoder for long constraint length codes implemented in software on a general-purpose parallel processing machine.

关键词： Computing systems Parallel processing Binary data Telecommunications Computer programming Forward error correction Network architectures Parallel computing signal processing Very large scale integration

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Example of combined algorithm development and architecture design (Keynote Paper)

Example of combined algorithm development and architecture d...

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advanced signal processing algorithms, architectures, and implementations III

作者： Deprettere, Ed F. Delft Univ. of Technology Delft Netherlands

Matrix computation and signal processing applications can be given effective and efficient concrete forms in a systematic way if (1) the originating problems have formal and complete specifications and (2) the associa... 详细信息

ISBN: (纸本)081940943X

关键词： signal processing

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Two digital video encoder circuits

Two digital video encoder circuits

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advanced signal processing algorithms, architectures, and implementations III

作者： Eldon, John A. TRW LSI Products Inc. La Jolla CA USA

ISBN: (纸本)081940943X

Central to `multimedia' image processing is the desire to encode computer graphics data into a standard television signal, complete with line, field, and color subcarrier synchronizing information. The numerous incompatibilities between television and computer display standards render this operation far less trivial than it sounds to anyone who hasn't worked with both types of signals. To simplify the task of encoding computer graphics signals into standard NTSC (North America and Japan) or PAL (most of Europe) television format for display, broadcast, or recording, TRW LSI Products Inc. has introduced the two newest members of it multimedia integrated circuit family, the TMC22090 and TMC22190 digital video encoders.

关键词： Video signal processing

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Two-dimensional signal classification by multiscale wavelet representation

Two-dimensional signal classification by multiscale wavelet ...

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advanced signal processing algorithms, architectures, and implementations III

作者： Sari-Sarraf, Hamed Brzakovic, Dragana Univ. of Tennessee/Knoxville Knoxville TN USA

ISBN: (纸本)081940943X

This paper describes a technique for classification of 2-D discrete signals. It consists of four modules, namely the partition, representation, measurement, and the classification modules. The first of these either passes the observed signal as a whole or divides it into subregions which may or may not overlap. The representation module first computes the shift-invariant multiscale wavelet representations (MSWAR) of the reference and the observed signals and then generates a corresponding set of 1-D signatures. The measurement module extracts those vital signal features to which the decision rules of the classification module are applied. The paper presents the design and implementation of each of these modules, emphasizing theoretical background behind the design and efficiency of their implementation. Also some preliminary results have been included that demonstrate the ability of this technique to classify observed signals that are corrupted by different types of deformities.

关键词： Digital signal processing

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ITERATIVE LEAST-SQUARES RECONSTRUCTION OF THE FOURIER PHASE OF AN IMAGE FROM THE MODULO-2-PI PHASE OF ITS BISPECTRUM

ITERATIVE LEAST-SQUARES RECONSTRUCTION OF THE FOURIER PHASE ...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： ERDEM, AT SEZAN, MI Eastman Kodak Co. (United States)

ISBN: (纸本)081940943X

We propose a novel technique for the least-squares reconstruction of the Fourier phase of an image from the modulo-2(pi) phase of its bispectrum. The proposed technique unwraps the given bispectral phase and reconstructs the Fourier phase of the image iteratively through alternating projections onto two particular constraint sets: (1) the set of bispectral phase functions that differ from the given modulo-2(pi) bispectral phase by only integral multiples of 2(pi) at every sample point, and (2) the set of bispectral phase functions that correspond to deterministic signals. We formally define the above sets and their corresponding projection operators. We describe the iterative algorithm in detail, and provide experimental results to demonstrate its performance.

关键词： Tantalum Reconstruction algorithms Stereolithography Image restoration Aluminum Image quality Phase measurement Plutonium Astronomy Image processing

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PARALLEL AND ADAPTIVE HIGH-RESOLUTION DIRECTION FINDING

PARALLEL AND ADAPTIVE HIGH-RESOLUTION DIRECTION FINDING

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CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： VANPOUCKE, F MOONEN, M DEPRETTERE, E Katholieke Univ. Leuven (Belgium) Delft Univ. of Technology (Netherlands)

ISBN: (纸本)081940943X

The direction-of-arrival (DOA) estimation problem consists in determining the angles of arrival of a number of signals impinging on a sensor array. Recently, the so-called ESPRIT method of Roy and Paulraj has received a great deal of attention in the literature. The method employs matrix decomposition techniques, such as singular value decomposition (SVD) and generalized Schur decomposition (GSD). The computational complexity thus involved represents a serious impediment, especially when a real-time implementation is aimed for. Therefore, the aim here is to develop an ESPRIT-type algorithm which is fully adaptive and amenable to parallel implementation. By introducing adaptivity, the computational complexity per sampling period is reduced from (Omicron) (m³) to (Omicron) (m²), where m is the `problem size,' i.e., the number of antenna doublets. On a parallel processor array with (Omicron) (m²) processors, the throughput is then (Omicron) (m^o), which means that the number of measurements that are processed per time unit is independent of the problem size. The algorithm is based on an adaptive SVD updating algorithm, combined with an adaptive GSD. The corresponding systolic implementation is based on the systolic SVD updating array of Moonen et al.

关键词： Matrices Sensors Algorithm development Interference (communication) Array processing Antennas Data processing Parallel computing Electrical engineering Phase shifts

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BLOCK CIRCULANT PRECONDITIONERS FOR 2-D DECONVOLUTION

BLOCK CIRCULANT PRECONDITIONERS FOR 2-D DECONVOLUTION

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CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： CHAN, RH NAGY, JG PLEMMONS, RJ Univ. of Hong Kong (Hong Kong China) Univ. of Minnesota (United States) Wake Forest Univ. (United States)

ISBN: (纸本)081940943X

Discretized 2-D deconvolution problems arising, e.g., in image restoration and seismic tomography, can be formulated as 1eas squares compuaions, mm lib— Tx112 where T is often a large-scale rectangular Toeplitz-block matrix. We consider solving such block least squares problems by the preconditioned conjugate gradient algorithm using square nonsingular circulant-block and related preconditioners, constructed from the blocks of the rectangular matrix T. Preconditioning with such matrices allows efficient implementation using the 1-D or 2-D Fast Fourier Transform (FFT). It is well known that the resolution of ill-posed deconvolution problems can be substantially improved by regularization to compensate for their ill-posed nature. We show that regularization can easily be incorporated into our preconditioners, and we report on numerical experiments on a Cray Y-MP. The experiments illustrate good convergence properties of these FET—based preconditioned iterations.

关键词： Image restoration Matrices Deconvolution Fourier transforms Point spread functions Radon Image processing Information operations Iterative methods Mathematics

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SYSTOLIC ADAPTIVE BEAMFORMING - FROM THEORY TO PRACTICE

SYSTOLIC ADAPTIVE BEAMFORMING - FROM THEORY TO PRACTICE

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CONF ON advanced signal processing algorithms, architectures, AND implementations 2

作者： HARGRAVE, P BNR Europe Ltd. (United Kingdom)

In this paper we describe aspects of an ongoing program of work aimed at the practical realization of systolic array structures to implement digital adaptive beam-forming algorithms.

ISBN: (纸本)0819406945

In this paper we describe aspects of an ongoing program of work aimed at the practical realization of systolic array structures to implement digital adaptive beam-forming algorithms.

关键词： signal processing Acoustics Antennas Algorithm development Phased arrays Prototyping Digital electronics Array processing Data processing Sensors

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