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

共 419 条记录，以下是161-170 订阅

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FOCUSED WIDE-BAND DIRECTION FINDING

FOCUSED WIDE-BAND DIRECTION FINDING

引用

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

作者： HUNG, HS MAO, CY Iowa State Univ. (United States)

ISBN: (纸本)081940943X

A robust focusing matrix, called unitary constrained array manifold focusing, is proposed for the coherent signal-subspace method which is a novel approach for direction finding of broad- band sources. The proposed focusing matrix has robustness against size variations of focusing sectors obtained by preliminary group angle estimates. To quantify information loss due to source focusing, a new measure, relative efficiency index, is introduced. This index is useful in assessing statistical sufficiency of a data-reduced statistic formed by source focusing. The sensitivity issue as well as estimation performance comparisons for various focusing schemes, based on simulations and relative efficiency index, are also presented.

关键词： Received signal strength Matrices Sensors Resolution enhancement technologies Interference (communication) signal to noise ratio Statistical analysis Data modeling Ruthenium signal attenuation

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A sharpness metric implementation for image processing applications with feedback

A sharpness metric implementation for image processing appli...

引用

Conference on advanced signal processing algorithms, architectures, and Implementantions xvIII

作者： Lam, Eric P. Thales Rayheon Syst Battlefield Radar Fullerton CA USA

ISBN: (纸本)9780819472946

Some image processing applications require an image meet a quality metric before processing it. If an image is so degraded that it is difficult or impossible to reconstruct, the input image may be discarded. In this paper, we present a metric that measures the relative sharpness with respect to a reference image frame. The reference frame may be a previous input image or an output frame from the system. The sharpness metric is based on analyzing edges. The assumption of this problem is that input images are similar to each other in terms of observation angle and time.

关键词： image processing system closed-loop system sharpness metric edge frame

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PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS 4

PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS

引用

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

作者： MAIWALD, D MOLLE, JWD BOHME, JF Ruhr-Univ. Bochum (Germany) Imperial College of Science Technology and Medicine (United Kingdom)

ISBN: (纸本)0819412767

We investigate the estimation of both the number of waves and the wave parameters for transient wavefields in a geophysical application. Models of the earth have to be verified by seismogram analysis. We present two nonparametric methods for the estimation of wave parameters where one is based on the first-order stationary spectrum and the other one is based on the second-order cumulant spectrum. We also investigate a parametric method for wave parameter estimation which allows us to determine the number of incident waves. The algorithms are applied to synthetic seismic data.

关键词： Sensors Data modeling Phased arrays signal detection Algorithm development Data analysis Fourier transforms Statistical analysis Earthquakes Wave propagation

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Two-dimensional signal gating for low power in high-performance multipliers

Two-dimensional signal gating for low power in high-performa...

引用

Conference on advanced signal processing algorithms architectures and implementations XIII

作者： Huang, ZJ Ercegovac, MD Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA

ISBN: (纸本)0819450782

We propose two-dimensional signal gating for high-performance multipliers including tree multipliers and array multipliers with an upper/lower left-to-right leapfrog (ULLRLF) structure. In ULLRLF array multipliers, the G-Y gating line follows the boundary of existing upper/lower partitioning. The G-X gating line goes through the upper and lower LRLF arrays. In tree multipliers, the G-Y gating line follows the existing partitioning of tree branches. The G-X line goes through all carry-save adders for partial product reduction. Because of the irregularity of the tree reduction structure, signal gating in tree multipliers is more complex than that in array multipliers. Experimental results indicate that two-dimensional gating is quite efficient in high-performance multipliers, with 65% power reduction under test data with large dynamic range.

关键词： signal gating low-power design high-performance multiplier

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CMOS PROCESSOR ELEMENT FOR A FAULT-TOLERANT SVD ARRAY 4

CMOS PROCESSOR ELEMENT FOR A FAULT-TOLERANT SVD ARRAY

引用

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

作者： KOTA, K CAVALLARO, JR Rice Univ. (United States)

ISBN: (纸本)0819412767

This paper describes the VLSI implementation of a CORDIC based processor element for use in a fault-reconfigurable systolic array to compute the singular value decomposition (SVD) of a matrix. The chip implements a time redundant fault tolerance scheme, which allows processors adjacent to a faulty processor to act as computation backup during the systolic idle time. Also, processors around a fault collaborate to reroute data around the faulty processor. This form of time redundancy is attractive when tolerance to a few faults needs to be achieved with little hardware overhead.

关键词： Computer aided design Array processing Tolerancing Very large scale integration Data backup Data communications Control systems Logic Matrices Photography

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A flexible arithmetic and logic unit for multimedia processing

A flexible arithmetic and logic unit for multimedia processi...

引用

Conference on advanced signal processing algorithms architectures and implementations XIII

作者： Senthilvelan, M Schulte, MJ Univ Wisconsin Dept Elect & Comp Engn Madison WI 53706 USA

ISBN: (纸本)0819450782

Novel arithmetic units are needed to achieve the cost, performance, power, and functionality requirements of emerging multimedia systems. This paper presents the design and implementation of a 64-bit arithmetic and logic unit (ALU) for multimedia processing. The 64-bit ALU supports subword-parallel processing by allowing one 64-bit, two 32-bit, four 16-bit, or eight 8-bit operations to be performed in parallel. In addition to conventional ALU operations, the ALU also supports several operations for enhanced multimedia processing including parallel compare, parallel average, parallel minimum, parallel maximum, and parallel shift and add. To efficiently implement a variety of multimedia applications, the ALU supports saturating and wrap-around arithmetic operations on unsigned and two's complement operands. This paper compares the area and delay of the 64-bit multimedia ALU to those of a more conventional 64-bit ALU.

关键词： ALU adder saturating multimedia computer arithmetic DSP

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Invertible time-frequency representations

Invertible time-frequency representations

引用

SPIE Conference on advanced signal processing algorithms, architectures, and implementations VIII

作者： Nelson, DJ Kenny, OP US Dept Def Ft George G Meade MD 20755 USA

ISBN: (纸本)0819429163

In this paper, we present a new class of representations of signals in the time-frequency (TF) plane. These representations are complex valued, linear, and satisfy reconstruction conditions in which the signal and its complex spectrum may be uniquely reconstructed from their TF representation. These surfaces are generalizations of one-dimensional linear transforms with which they share many properties.. The primary advantage of these representations is that the phase of the surface may be used to recover signal information which is not contained in real TF surfaces. Linearity guarantees that cross-terms normally associated with TF distributions do not exist in these representations. Several examples of invertible surfaces are presented, and it is demonstrated that these surfaces agree with normal intuition. Finally, a method, based on the phase gradient, is proposed as a method of modifying Fourier surfaces to produce representations which are more focused or more concentrated in time and frequency.

关键词： Time-Frequency signal reconstruction Fourier transform spectral phase instantaneous frequency group delay phase gradient

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Rapid transient superresolution frequency tracking via generalized ESPRIT

Rapid transient superresolution frequency tracking via gener...

引用

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

作者： Nickel, Robert M. Penn State Univ Dept Elect Engn University Pk PA 16802 USA

ISBN: (纸本)9780819468451

We are presenting a new method for super resolution tracking of frequency modulated sinusoids in white noise. The method is specifically designed to handle the rapid transient problem, i.e. the problem of tracking a continuous, rapidly changing instantaneous frequency contour. The proposed method employs to components: 1) an adaptive generalized scale transform 1, 2 which applies a localized change of time-frequency coordinates within the given signal, and 2) an estimation of signal parameters by rotational invariance techniques 3 (ESPRIT). With experiments we have shown that the proposed method provides a significantly higher estimation accuracy than conventional methods. 3 With an optimal choice of transform parameters the estimation error can be reduced dramatically. Error reductions of over 40% have been observed.

关键词： instantaneous frequency tracking non-uniform sampling estimation of signal parameters by rotational invariance techniques (ESPRIT) generalized scale transform

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Seismic-array signal processing for moving source localization

Seismic-array signal processing for moving source localizati...

引用

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

作者： Stafsudd, Jing Z. Hudson, Ralph E. Taciroglu, Ertugrul Yao, Kung UCLA Dept Elect Engn Los Angeles CA 90095 USA UCLA Dept Civil & Environm Engn Los Angeles CA 90095 USA

ISBN: (纸本)9780819468451

In this paper, we consider the use of a seismic sensor array for the localization and tracking of a wideband moving source. The proposed solution consists of two steps: source Direction-Of-Arrival (DOA) estimation and localization via DOA estimates. Three DOA estimation methods are considered. The Covariance Matrix Analysis and the Surface Wave Analysis are previously published DOA estimation algorithms shown to be effective in the localization of a stationary wideband source. This paper investigates their performance on moving wideband sources. A novel DOA estimation algorithm, the Modified Kirlin's Method was also developed for the localization of a moving Source. The DOAs estimated by these algorithms are combined rising a least-squares optimization for source localization. The application of these algorithms to real-life data show the effectiveness of both the Surface Wave Analysis and the Modified Kirlin's Method in locating and tracking a wideband moving source.

关键词： direction-of-arrival (DOA) source localization mover localization seismic signal processing surface waves

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Construction of time-frequency representations from moments

Construction of time-frequency representations from moments

引用

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

作者： Cohen, Leon Loughlin, Patrick Davidson, Keith CUNY 695 Pk Ave New York NY 10021 USA Univ Pittsburgh Pittsburgh PA 15261 USA Off Naval Res Arlington VA 22217 USA

ISBN: (纸本)9780819468451

Given the moments of a time-frequency distribution, one can, in principle, construct the characteristic function from which one then obtains the distribution by Fourier transformation. However, often one can not find a closed form for the characteristic function and hence one can not obtain the distribution in a direct manner. We formulate the problem of constructing time-frequency representations from moments without first constructing the characteristic function. Our method is based on expanding the distribution in terms of a complete set of functions where the expansion coefficients are dependent directly on the moments. We apply the method to a case where the even moments are manifestly positive which is a necessary condition for obtaining a proper time-frequency representation.

关键词： Time-frequency analysis Fermium Frequency modulation Acoustics Applied physics Fourier transforms Scattering Scientific research signal processing

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