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共 457 条记录，以下是81-90 订阅

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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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Time-frequency analysis of a motor-generator 6

Time-frequency analysis of a motor-generator

引用

Conference on advanced signal processing algorithms, architectures, and implementations VI

作者： Rohrbaugh, R USN CTR SURFACE WARFAREADV SIGNAL PROC BRANCHBREMERTONWA 98314

Time-frequency methods are applied for bearing analysis of a motor-generator. We show that these methods reveal features that are not seen by traditional methods, such as the power spectrum. These features may be used... 详细信息

ISBN: (纸本)0819422347

关键词： Time-frequency analysis Modulation Amplitude modulation Manufacturing Analytical research Corrosion Data modeling Quantum wells signal processing Warfare

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HIGHLY PIPELINED VLSI ARCHITECTURE FOR COMPUTATION OF FAST FOURIER-TRANSFORMS 4

HIGHLY PIPELINED VLSI ARCHITECTURE FOR COMPUTATION OF FAST F...

引用

4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： YEH, HJ Ecole Normale Superieure de Lyon (South Korea)

ISBN: (纸本)0819412767

An on-chip VLSI architecture for computation of Fourier transforms is presented. It performs the arithmetic operations in a digit-level pipeline fashion. For this purpose, the implementation of arithmetic operators is based on on-line (i.e., digit-serial and most significant digit first) arithmetic, and the transforms are performed by a parallel-pipeline version of the Cooley- Tukey fast Fourier transform (FFT) algorithm.

关键词： Fourier transforms Very large scale integration Transform theory Binary data Computer architecture Computing systems Matrices Network architectures Digital signal processing signal processing

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RELATIONSHIPS BETWEEN THE FOURIER-TRANSFORM AND THE WAVELET TRANSFORM

RELATIONSHIPS BETWEEN THE FOURIER-TRANSFORM AND THE WAVELET ...

引用

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

作者： RESNIKOFF, HL BURRUS, CS Aware Inc. (United States) Aware Inc. and Rice Univ. (United States)

ISBN: (纸本)0819404098

This paper derives the relationship between the coefficients of the Fourier expansion of a periodic signal and the coefficients of the wavelet expansion of the same signal. The formula derived shows how the Fourier concept of frequency and the wavelet concept of scale are related and how the wavelet coefficients display the information contained in the signal in a new way. The relationship also shows how the wavelet expansion can be used to approximately calculate the Fourier coefficients.

关键词： Wavelets Fourier transforms Wavelet transforms Computing systems Digital signal processing Mathematical modeling signal processing Systems modeling Feature extraction Mathematics

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signal EXTRAPOLATION IN NOISY DATA WITH WAVELET REPRESENTATION 4

SIGNAL EXTRAPOLATION IN NOISY DATA WITH WAVELET REPRESENTATI...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： LIN, LC KUO, CCJ Univ. of Southern California (United States)

ISBN: (纸本)0819412767

A new approach for signal extrapolation based on wavelet representation known as scale-time limited extrapolation and a denoising process is investigated in this research. We first examine a new signal modeling technique using wavelets and the corresponding scale-time limited signal extrapolation algorithm. Then, the sensitivity of the algorithm to noise is discussed, and a denoising algorithm based on the time-localization property of the wavelet transform is proposed. By integrating the denoising process and the iterative scale-time limited extrapolation algorithm, we obtain a very robust signal extrapolation algorithm for noisy data. A simulation result of signal extrapolation from noisy observed data is presented to illustrate the performance of the proposed robust signal extrapolation algorithm.

关键词： Wavelets Denoising Interference (communication) signal processing signal to noise ratio Algorithm development Evolutionary algorithms Image processing Reconstruction algorithms Wavelet transforms

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RADON-TRANSFORM BASED VELOCITY ESTIMATION OF VEHICLES WITH LINEAR ARRAYS 4

RADON-TRANSFORM BASED VELOCITY ESTIMATION OF VEHICLES WITH L...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： NERI, A JACOVITTI, G MINNITI, A TASSELLI, T Univ. of Rome III (Italy) Univ. of Rome CITEC SpA (Italy)

ISBN: (纸本)0819412767

This paper illustrates a vehicle imaging technique for ground traffic control applications. The imaging is performed by exploiting the vehicle motion with respect to a pair of linear arrays. The method for estimating the vehicular velocity from the data collected by one of the arrays is described, and the theoretical accuracy of the estimate is discussed in detail through the evaluation of the Rao-Cramer bound. In particular it is recognized that the maximum likelihood solution is based on the radon transform of the data. Experimental results obtained with a field operating prototype are finally shown.

关键词： Radon transform Error analysis Statistical analysis Motion estimation Interference (communication) Radon Charge-coupled devices Motion analysis Promethium Prototyping

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What are the time-frequency moments of a signal?

What are the time-frequency moments of a signal?

引用

Conference on advanced signal processing algorithms, architectures, and implementations XI

作者： Loughlin, PJ Univ Pittsburgh Dept Elect Engn Pittsburgh PA 15261 USA

ISBN: (纸本)0819441880

We review, recent work on defining the time-frequency moments of a signal. Expressions are given for moments dropt(m)drop(omega), and of all orders n, m, in terms of the amplitude and phase of the signal and spectrum. Knowing the time-frequency moments is of interest for a variety of reasons. including their potential utility as features for classification of nonstationary signals, and also because from the moments one call construct the time-varying spectral density, or approximate it using a few moments.

关键词： instantaneous frequency instantaneous bandwidth skew kurtosis moments spectral analysis

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EFFICIENT BEAM-BASED ADAPTIVE processing FOR PLANAR ARRAYS

EFFICIENT BEAM-BASED ADAPTIVE PROCESSING FOR PLANAR ARRAYS

引用

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

作者： KRATZER, SG Supercomputing Research Ctr. (United States)

ISBN: (纸本)0819404098

Beam-based adaptive processing is an economical way to achieve good interference rejection performance from an adaptive receiving array, at much less computational cost than full element-based methods. However, to exploit this potential for planar arrays it is necessary to identify, in real time, which beams must be retained for adaptive concellation. This paper analyzes the beam-selection problem and presents a computationally efficient algorithm that performs real-time beam selection.

关键词： signal processing signal to noise ratio Statistical analysis Algorithm development Beam analyzers Electroluminescence Cobalt Electronics Fourier transforms Phased arrays

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DISTRIBUTIONS CONCENTRATED ALONG THE INSTANTANEOUS FREQUENCY

DISTRIBUTIONS CONCENTRATED ALONG THE INSTANTANEOUS FREQUENCY

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

作者： COHEN, L Hunter College/CUNY (United States)

We show that for purely frequency modulated signals one can always find a distribution which is infinitely concentrated along its instantaneous frequency. For signals that are both frequency and amplitude modulated we... 详细信息

ISBN: (纸本)0819404098

关键词： Frequency modulation Modulation Fermium Phase shift keying Amplitude modulation Algorithm development Phase modulation Time-frequency analysis signal analysis Tellurium

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Phase-space approach to wave propagation with dispersion and damping

Phase-space approach to wave propagation with dispersion and...

引用

Conference on advanced signal processing algorithms, architectures, and implementations XIV

作者： Loughlin, P Cohen, L Univ Pittsburgh Pittsburgh PA 15261 USA

ISBN: (纸本)0819454974

We consider dispersive propagation with damping in phase-space, and derive the Wigner distribution in terms of the initial wave and the dispersion relation. The case for no damping. that is. lossless propagation, has been previously considered by Cohen, and is a special case of the more general result presented here. Simple and physically revealing approximations of the Wigner distribution in terms of the initial Wigner distribution are presented. Also. exact low-order conditional moments are given and their interpretation is discussed.

关键词： Wave propagation Dispersion Fourier transforms Time-frequency analysis Astatine signal attenuation Spatial frequencies Partial differential equations signal processing Waveguides

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