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共 464 条记录，以下是71-80 订阅

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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

引用

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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SCHEDULING PARALLEL implementations OF PARTITIONED ORTHOGONAL TRANSFORMATIONS

SCHEDULING PARALLEL IMPLEMENTATIONS OF PARTITIONED ORTHOGONA...

引用

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

作者： KUCHIBHOTLA, P RAO, BD Univ. of California/San Diego (United States)

ISBN: (纸本)081940943X

Orthogonal matrix transformations form an important part of matrix-based signal processing applications. Systolic arrays for computing these algorithms have been developed and the size of these arrays usually depends directly on the size of the problem. For large matrix sizes, implementing large numbers of processors in hardware is not physically feasible. In this paper, we examine two popular orthogonal transformations, Givens rotations and householder transformations (HT), from the viewpoint of realizing a fixed-size parallel processor array that can handle large data matrices. An efficient scheduling procedure is used to compute the HT on a systolic type array, its performance is compared with that of an array designed for computing the Givens method. An important conclusion resulting from the comparison is that the performance of the HT array is superior to that for the Givens method when the matrices are larger compared to the array size.

关键词： Silicon signal processing Algorithm development Matrices Parallel computing Array processing Data storage Electrochemical etching Filtering (signal processing) Lanthanum

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The process phantom - a tool for searching for chirps

The process phantom - a tool for searching for chirps

引用

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

作者： Hershey, JE Gen Elect Corp Res & Dev Ctr Niskayuna NY 12309 USA

ISBN: (纸本)0819429163

Searching for wideband short duration chirps is an important issue in spectrum surveillance. We propose a method and apparatus, inspired by optical tomography, by which a one-dimensional signal is converted to a two-dimensional image. This image has the remarkable property that it may disclose discernible structure. A chirp in additive white Gaussian noise, even undersampled, may be detected. The process is inherently linear and may be easily implemented by parallel processing or through the construction of an optoelectronic device.

关键词： signal recognition spectrum surveillance phantom back projection chirps display

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INSTANTANEOUS QUANTITIES AND UNCERTAINTY CONCEPTS FOR signal DEPENDENT TIME-FREQUENCY DISTRIBUTIONS

INSTANTANEOUS QUANTITIES AND UNCERTAINTY CONCEPTS FOR SIGNAL...

引用

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

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

ISBN: (纸本)0819406945

This paper presents a review of some concepts associated with time-frequency distributions-- the instantaneous frequency, group delay, instantaneous bandwidth, and marginal properties-- and generalizes them in time-frequency via rotation of coordinates. This work emphasizes the need to examine time-frequency distributions in the general time-frequency plane, rather than restricting oneself to a time and/or frequency framework. This analysis leads to a generalized uncertainty principle, which has previously been introduced in radar theory. This uncertainty principle is invariant under rotation in the time-frequency plane, and should be used instead of the traditional definition of Gabor. It is desired to smooth a time-frequency distribution that is an energy density function into one that is an energy function. Most distributions are combinations of density and energy functions but the Wigner-Ville distribution is purely a density function. By using a local version of the generalized uncertainty principle, the Wigner- Ville distribution is smoothed into a signal dependent spectrogram using an iterative algorithm. It is believed that this procedure may represent, in some way an optimum removal of signal uncertainty in the time-frequency plane.

关键词： Time-frequency analysis Smoothing signal processing Radar signal processing signal analyzers Fermium Frequency modulation Algorithm development Radar Detection theory

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signal processing algorithms by permutation test in radar application 6

Signal processing algorithms by permutation test in radar ap...

引用

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

作者： AlvarezVaquero, F SanzGonzalez, JL UNIV POLITECN MADRID ETSI TELECOMUNDEPT SIGNAL SYST & RADIOCOMMUNE-28040 MADRIDSPAIN

ISBN: (纸本)0819422347

A hypothesis H is parametric if every distribution from the process defined by H belongs to a family of distributions characterized by a finite number of parameters; on the other hand, if the distribution can not be defined by a finite number of parameters, the hypothesis is nonparametric. In this paper, we analyze a detector based on the optimum permutation test, applied to nonparametric radar detection which provide good performances without a large computational work, and we compare it with the parametric test and rank test in the Neyman-Pearson sense. The computational complexity of the detector is high and its implementation in real time is difficult, due to the number of operations increase with the factorial of the number of samples. Also, we present an algorithm that reduces the computational work required. We also present the detectability characteristic of the optimum permutation test against rank test and parametric test under Gaussian noise environments and different types of target models (nonfluctuating, Swerling I and Swerling ii). The detection probability versus signal-to-noise ratio is estimated by Monte-Carlo simulations for different parameter values (N pulse, M reference samples and false alarm probability P_fa).

关键词： nonparametric permutation test rank test radar detection detectability target models

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Generalized reaction-diffusion equation for image processing

Generalized reaction-diffusion equation for image processing

引用

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

作者： Wei, GW Natl Univ Singapore Dept Computat Sci Singapore Singapore

ISBN: (纸本)0819432938

This paper presents a robust algorithm for image processing using generalized reaction-diffusion equations. An edge enhancing functional is proposed for image enhancement. A number of super diffusion operators is introduced for fast and effective smoothing. Statistical information is utilized for robust edge-stopping and diffusion rate estimation. A unification of computational methods is discussed. The unified computational method is employed for the numerical integration of the generalized reaction-diffusion equations. Computer experiments indicate that the present algorithm is very efficient for edge-detecting and noise-removing.

关键词： image processing generalized reaction-diffusion equations unified computational method

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Phased array beamforming using nonlinear oscillators

Phased array beamforming using nonlinear oscillators

引用

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

作者： Gabbay, M Larsen, ML Tsimring, LS Informat Syst Labs Inc San Diego CA 92121 USA

ISBN: (纸本)0819454974

We describe a concept in which an array of coupled nonlinear oscillators is used for beamforming in phased array receivers. The signal that each sensing element receives, beam steered by time delays, is input to a nonlinear oscillator. The nonlinear oscillators for each element are in turn coupled to each other. For incident signals sufficiently close to the steering angle. the oscillator array will synchronize to the forcing signal whereas more obliquely incident signals will not induce synchronization. The beam pattern that results can show a narrower mainlobe and lower sidelobes than the equivalent conventional linear beamformer. We present a theoretical analysis to explain the beam pattern of the nonlinear oscillator array.

关键词： beamforming array processing nonlinear signal processing coupled oscillators nonlinear dynamics

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Transient signal detection using the empirical mode decomposition

Transient signal detection using the empirical mode decompos...

引用

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

作者： Larsen, ML Ridgway, J Waldman, CH Gabbay, M Buntzen, RR Battista, B Informat Syst Labs Inc San Diego CA 92121 USA

ISBN: (纸本)0819454974

In this paper, we report on efforts to develop signal processing methods appropriate for the detection of man-made electromagnetic signals in the nonlinear and nonstationary underwater electromagnetic noise environment of the littoral. Using recent advances in time series analysis methods [Huang et al., 1998], we present new techniques for detection and compare their effectiveness with conventional signal processing methods, using experimental data from recent field experiments. These techniques are based on an empirical mode decomposition which is used to isolate signals to be detected from noise without a priori assumptions. The decomposition generates a physically motivated basis for the data.

关键词： underwater electromagnetic data nonlinear signal processing empirical mode decomposition

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