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检索条件"任意字段=Advanced Signal Processing Algorithms, Architectures, and Implementations 1990"

共 433 条记录，以下是151-160 订阅

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Construction of signal-dependent Cohen's-class time-frequency distributions using iterative blind deconvolution

Construction of signal-dependent Cohen's-class time-frequenc...

引用

Conference on advanced signal processing algorithms architectures and implementations XIII

作者： Yagle, AE Torres-Fernández, JE Univ Michigan Dept EECS Ann Arbor MI 48109 USA

ISBN: (纸本)0819450782

The problem of kernel design for Cohen time-frequency distributions is formulated as a blind deconvolution problem. It is shown that the iterative blind deconvolution method (IBDM) used in image restoration problems can be successfully applied to solve the kernel design problem. We obtain the following results: (1) the rate of convergence depends on which domains the constraints are imposed (2) certain constraints are needed for algorithm convergence (3) the more constrained the kernel design is, the faster the rate of convergence (4) there are tradeoffs between constraints, e.g., compact support vs. satisfaction of marginals;(5) time-frequency distributions which are more amenable to visual interpretation can be obtained using this algorithm.

关键词： time-frequency distributions blind deconvolution

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Applications of non-uniform multi-gabor expansions to time-frequency analysis

Applications of non-uniform multi-gabor expansions to time-f...

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Conference on advanced signal processing algorithms architectures and implementations XIII

作者： Hoffman, M Li, SD San Francisco State Univ Dept Math San Francisco CA USA

ISBN: (纸本)0819450782

We present a non-uniform multi-Gabor expansion (MGE) algorithm in which multiple windows and their corresponding translations and modulations are used for signal analysis. Analysis windows of varying supports, each corresponding to a chosen. scale of detail, decompose a signal using different translation and modulation parameters for each scale. Structural analysis of dual synthesis waveforms is provided. We show that synthesis waveforms can still be formed from translations and modulations of a set of basic dual windows at each scale. The use of different translation and modulation parameters at each scale allows for a more refined and concise time-frequency representation of the signal, while retaining the versatility of uniform MGEs in representing signal dynamics at many different scales. Examples of implementation and practical application will be presented.

关键词： Modulation Magnesium Matrices Time-frequency analysis Thulium Mathematics signal analysis Structural analysis Astronomy Physics

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Interleaver design for high speed turbo decoders

Interleaver design for high speed turbo decoders

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Conference on advanced signal processing algorithms architectures and implementations XIII

作者： Abbasfar, A Yao, K Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90024 USA

ISBN: (纸本)0819450782

Recently some efficient parallel architectures for turbo decoder have been proposed. In these architectures the bottleneck for the parallelization of the decoder is the interleaver. On the other hand, turbo codes achieve a very impressive near Shannon-capacity performance in which the interleaver plays a crucial role. Therefore, it is of great interest to design interleavers that are good from both performance and parallelization point of views. In this paper we have proposed an interleaver structure that is suitable for parallelization of turbo decoders. It is shown that such an interleaver can be designed to have good BER performance as well. By this structure not only fast decoders with very low latency can be built, but also the regularity of the decoder and the simplicity of the interleaver structure make them promising for VLSI implementation. We also present a fast algorithm to design such an interleaver, which can be used to design S-random interleavers as well. Such interleavers have been designed and the performances are compared to that of S-random interleavers by simulations.

关键词： Turbo Code interleaver design parallel processing high speed Turbo decoder

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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...

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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

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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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Adaptive cluster selection for collaborative beamforming in ground sensors communications with UAV

Adaptive cluster selection for collaborative beamforming in ...

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advanced signal processing algorithms, architectures, and implementations XV

作者： Hsiao, P.H. Kung, H.T. Gans, M.J. Suter, B.W. Harvard Univ. United States AFRL IFGC United States

No abstract available

关键词： Sensors signal to noise ratio Transmitters Phased arrays Antennas Receivers Unmanned aerial vehicles Matrices Space operations Gallium nitride

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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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