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Proceedings of SPIE: advanced signal processing algorithms, architectures, and implementations xIII

Proceedings of SPIE: Advanced Signal Processing Algorithms, ...

引用

advanced signal processing algorithms, architectures, and implementations

This Volume 5205 of the conference proceedings contains 59 papers. Topics discussed include time frequency and time scale analysis, adaptive sensor network, wireless communication, image processing, exploitation of structured in imaging and signal processing, matrix algorithms, signal processing applications, computer arithmetic and arithmetic and architectures for real time applications.

关键词： Optical engineering

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Quartic functions for time-frequency analysis with applications to signal adaptive kernel design

Quartic functions for time-frequency analysis with applicati...

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conference on advanced signal processing - algorithms, architectures, and implementations VII

作者： ONeill, JC Ecole Normale Superieure de Lyon (United States)

ISBN: (纸本)0819425842

In time-frequency analysis, we extend functions of one variable to functions of two variables. The functions of two variables provide information about the signal that is not easily discernible from the functions of one variable. In this paper, we investigate a method for creating quartic functions of three variables and also a quartic function of all four variables. These quartic functions provide a meaningful representation of the signal that goes beyond the well known quadratic functions. The quartic functions are applied to the design of signal-adaptive kernels for Cohen's class and shown to provide improvements over previous methods.

关键词： time-frequency analysis kernel design quartic functions

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Approach to regularization preconditioners for image processing

Approach to regularization preconditioners for image process...

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conference on advanced signal processing algorithms architectures and implementations xIII

作者： Estatico, C Univ Genoa Dipartmento Matemat I-16146 Genoa Italy

ISBN: (纸本)0819450782

Preconditioning techniques for linear systems are widely used in order to speed up the convergence of iterative methods. Unfortunately, linear systems arising in image processing are highly ill-conditioned and preconditioners often give bad results, since the noise components on the data are strongly amplified already at the early iterations. In this work, we propose filtering strategies which allow to obtain preconditioners with regularization features for Toeplitz systems of image deblurring. Regularization preconditioners are able to speed up the convergence in the space less sensitive to the noise and, simultaneously, they slow down the restoration from components mainly corrupted by noise. A 2-d numerical simulation concerning astronomical image deblurring confirms the effectiveness of the arguments.

关键词： preconditioning ill-conditioning regularization approximation operators Toeplitz matrices

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Information theoretic signal detection on the time-frequency plane

Information theoretic signal detection on the time-frequency...

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conference on advanced signal processing algorithms architectures and implementations xIII

作者： Aviyente, S Michigan State Univ E Lansing MI 48824 USA

ISBN: (纸本)0819450782

A comprehensive theory for time-frequency based signal detection has been developed during the past decade. The time-frequency detectors proposed in literature are linear structures operating on the time-frequency representation of the signals and are equivalent to quadratic receivers that are defined in the,time domain. In this paper, an information theoretic approach for signal detection on the time-frequency plane is introduced. In recent years, Renyi entropy has been proposed as an effective measure for quantifying signal complexity on the time-frequency plane and some important properties of this measure have been proven. In this paper, a new approach that uses the entropy functional as the test statistic for signal detection is developed. The minimum error detection algorithm is derived and the performance of this new signal detection method is demonstrated through examples.

关键词： signal detection Time-frequency analysis Detection and tracking algorithms Interference (communication) Sensors Radar Algorithm development Backscatter signal to noise ratio Receivers

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Transmit diversity for TDD systems

Transmit diversity for TDD systems

引用

conference on advanced signal processing algorithms, architectures and implementations xII

作者： Wang, JB Yao, K Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

ISBN: (纸本)0819445584

Multiple input multiple output (MIMO) communications have been a hot research area in recent years. Most literature makes the assumption that the channel information is not known at the transmitter but known perfectly at the receiver. We focus on the situation where both the transmitter and the receiver know the channel information. We consider a transmit diversity scheme that maximizes the signal to noise ratio at the receiver. We analyze its performance in terms of capacity, duality and asymptotic behavior. By simulation, we compare this scheme with Alamouti's transmit diversity to show the advantage of utilizing the channel side information to improve the performance of the wireless systems.

关键词： signal to noise ratio Receivers signal processing Lithium Lutetium Transmitters Antennas

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ALGORITHMIC ENGINEERING - A SIMPLIFIED DERIVATION OF THE ORTHOGONAL LEAST-SQUARES LATTICE

ALGORITHMIC ENGINEERING - A SIMPLIFIED DERIVATION OF THE ORT...

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

作者： PROUDLER, IK MCWHIRTER, JG Royal Signals and Radar Establishment (United Kingdom)

ISBN: (纸本)081940943X

Algorithmic engineering provides a rigorous framework for describing and manipulating the type of building blocks commonly used to define parallel algorithms and architectures for digital signal processing. So far, the concept has only been illustrated by means of some relatively simple examples. These relate to the use of QR decomposition by Givens rotations for the purposes of adaptive filtering and beamforming. In this paper we present a much more challenging example whereby the techniques of algorithmic engineering are used to derive the QRD-based lattice algorithm for multi-channel least squares linear prediction. The elegant simplicity of this derivation, which comprises a sequence of straightforward diagrammatic manipulations, serves to demonstrate the potential power of algorithmic engineering as a formal design technique.

关键词： signal processing Neptunium Algorithm development Array processing Digital signal processing Linear filtering Digital filtering Computer architecture Parallel processing Parallel computing

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NETWORKS FOR MODELING AND signal-processing

NETWORKS FOR MODELING AND SIGNAL-PROCESSING

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

作者： YOU, YL xU, WY GORYN, D KAVEH, M Univ. of Minnesota (United States) Siemens AG (Germany)

ISBN: (纸本)081940943X

This paper presents modifications of the continuous Hopfield and Hartline-Ratliff networks for use in signal restoration and parameter estimation. The particular parameter estimation problem of interest is concerned with the estimation of the directions of arrival of an unknown number of plane waves in unknown noise. Restoration of linearly distorted noisy images is considered as an example of regularized restoration of a signal with known dynamic range.

关键词： Neurons signal to noise ratio Neural networks Image restoration signal processing Sensors Binary data Computer programming Control systems Phased arrays

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RECENT RESULTS IN ADAPTIVE ARRAY DETECTION

RECENT RESULTS IN ADAPTIVE ARRAY DETECTION

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

作者： KALSON, SZ Lincoln Lab./MIT (United States)

ISBN: (纸本)0819406945

Some recent results in the theory of adaptive array detection are presented. Detection curves are given for various detection algorithms. These detection algorithms are suitable for nulling out noise or interference sources in which the noise statistics are to be estimated from target- free data. They share the constant false alarm rate property, so that their false alarm rate can be set without knowledge of the noise covariance matrix. Also considered is a detection algorithm employing diagonal loading.

关键词： Sensors signal detection Detection and tracking algorithms signal attenuation Phased arrays signal processing Detector arrays Target detection Monte Carlo methods signal to noise ratio

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Optical infrared flame detection system with neural networks

Optical infrared flame detection system with neural networks

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conference on advanced signal processing algorithms, architectures, and implementations xVII

作者： Huseynov, Javid J. Baliga, Shankar B. Univ Calif Irvine Sch Informat & Comp Sci Irvine CA 92697 USA Gen Monitors Inc Lake Forest CA 92630 USA

ISBN: (纸本)9780819468451

A model for an infrared (M) flame detection system using artificial neural networks (ANN) is presented. The joint time-frequency analysis (JTFA) in the form of a Short-Time Fourier Transform (STFT) is used for extracting relevant input features for a set of ANNs. Each ANN is trained using the backpropagation conjugate-gradient (CG) method to distinguish all hydrocarbon flames from a particular type of environmental nuisance and background noise. signal saturation caused by the increased intensity of IR sources at closer distances is resolved by an adjustable gain control. A classification scheme with trained ANN connection weights was implemented on a digital signal processor for use in an industrial hydrocarbon flame detector.

关键词： artificial neural networks signal processing infrared detectors fire detection

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Adaptive radar CFAR using signal based suppression

Adaptive radar CFAR using signal based suppression

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conference on advanced signal processing - algorithms, architectures, and implementations VII

作者： Brovko, TTN Whang, YE Hughes Aircraft Co. (United States)

ISBN: (纸本)0819425842

The primary basis for adaptive radar algorithm design is that (1) a Binary Hypothesis formulation with unknown parameters is an adequate test and (2) that radar interference is composed of combinations of thermal noise, self induced clutter, and extraneous noise. This is the typical generalized likelihood formulation that yield the CFAR characteristic for the assumed conditions. implementations have shown that such formulations yield inadequate performance in complex clutter environments. As compensation measure, a secondary CFAR process then addresses the potential violation of this assumption by large ''target-like'' interference such as large Clutter discretes or a large number of targets interfering with each other. In order to detect small targets, an approach based on the Likelihood Statistic provides a technique for optimally suppressing the neighboring large signals. Performance is characterized as a function of a generalized distance and relative signal power ratios in the Joint Space-Time domain.

关键词： Target detection signal detection Doppler effect Distortion Radar Modulation Electronic filtering signal processing Interference (communication) signal to noise ratio

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