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

共 420 条记录，以下是71-80 订阅

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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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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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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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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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INFORMATION IN THE TIME-FREQUENCY PLANE AND ITS APPLICATIONS TO ADAPTIVE RADAR signal-processing 4

INFORMATION IN THE TIME-FREQUENCY PLANE AND ITS APPLICATIONS...

引用

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

作者： BHATTACHARYA, TK JONES, G HAYKIN, S McMaster Univ. (Canada)

ISBN: (纸本)0819412767

The detection of small floating targets in an ocean environment is discussed in this paper. Because of the time-varying nature of the growler's radar returns, classical detection schemes do not work well. It is shown that these problems can be overcome if the detection is performed in the joint time-frequency plane. The effectiveness of the detection scheme is demonstrated by looking at two specific aspects of the problem: (1) detection of the target when the radar is scanning a certain sector, and (2) when the radar is dwelling in a certain azimuthal direction for a longer period of time.

关键词： Radar Time-frequency analysis Target detection Polarization signal detection Doppler effect Detection and tracking algorithms Feature extraction Fourier transforms Radar signal processing

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A low power, high performance approach for time-frequency/time-scale computations

A low power, high performance approach for time-frequency/ti...

引用

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

作者： Suter, BW Stevens, KS USAF Res Lab IFGC Griffiss AFB NY 13441 USA

ISBN: (纸本)0819429163

This paper presents an application of formal mathematics to create a high performance, low power architecture for time-frequency and time-scale computations implemented in asynchronous circuit technology that achieves significant power reductions and performance enhancements over more traditional approaches. Utilizing a combination of concepts from multirate signal processing and asynchronous circuit design, a case study is presented dealing with a new architecture for the fast Fourier transform, an algorithm that requires globally shared results. Then, the generalized distributive law is presented as an important paradigm for advanced asynchronous hardware design.

关键词： time-frequency computations time-scale computations asynchronous circuit design multirate signal processing generalized distributive law fast Fourier transform

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MOBILE RADIO PROPAGATION CHANNEL MODELING - signal-processing CHALLENGES 4

MOBILE RADIO PROPAGATION CHANNEL MODELING - SIGNAL-PROCESSIN...

引用

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

作者： SENADJI, B CNET ETP (Australia)

ISBN: (纸本)0819412767

This paper addresses the problem of mobile radio propagation channel modeling and underlines the need for further research in this domain. The paper first describes three characteristics of the mobile radio propagation channel which are the propagation-path loss, the time-varying aspect, and the multipath characteristics. It then describes the properties and limitations of the present methods used for channel modeling. The main limitation concerns the non-stationary aspect of the mobile radio propagation channel. Two signal processing approaches are proposed to remedy the problem. Finally, the paper addresses the definition of validation criteria in order to evaluate and quantify the accuracy of each proposed model.

关键词： Radio propagation Atmospheric propagation Telecommunications Doppler effect signal attenuation Systems modeling signal processing Autoregressive models Wave propagation Statistical modeling

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