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

共 168 条记录，以下是21-30 订阅

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What are the time-frequency moments of a signal?

What are the time-frequency moments of a signal?

引用

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

作者： Loughlin, PJ Univ Pittsburgh Dept Elect Engn Pittsburgh PA 15261 USA

ISBN: (纸本)0819441880

We review, recent work on defining the time-frequency moments of a signal. Expressions are given for moments dropt(m)drop(omega), and of all orders n, m, in terms of the amplitude and phase of the signal and spectrum. Knowing the time-frequency moments is of interest for a variety of reasons. including their potential utility as features for classification of nonstationary signals, and also because from the moments one call construct the time-varying spectral density, or approximate it using a few moments.

关键词： instantaneous frequency instantaneous bandwidth skew kurtosis moments spectral analysis

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FPOP: Field Programmable On-line oPerators

FPOP: Field Programmable On-line oPerators

引用

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

作者： Tisserand, A Marchal, P Piguet, C CSEM Neuchatel Switzerland

ISBN: (纸本)0819432938

This paper describes a new digital reprogrammable architecture called Field Programmable On-line oPerators (FPOP). This architecture is a kind of FPGA dedicated to very low-power implementations of numerical algorithms in signal processing or digital control applications for embedded or portable systems. FPOP is based on a reprogrammable array of on-line arithmetic operators. On-line arithmetic is a digit-serial arithmetic with most significant digits first using a redundant number system. Because of the small size of the digit-serial operators and the small number of communication wires between the operators, single chip implementation of complex numerical algorithms can be achieved using on-line arithmetic. Furthermore, the digit-level pipeline and the small size of the arithmetic operators lead to high-performance parallel computations. Compared to a standard FPGA, the basic cells in FPOP are arithmetic operators such as adders, subtracters, multipliers, dividers, square-rooters, sine or cosine operators. This granularity level allows very efficient power x delay implementations of most algorithms used in digital control and signal processing. The circuit also integrates some analog to digital and digital to analog converters.

关键词： FPGA reconfigurable logic on-line arithmetic digital control signal processing

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

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

引用

advanced signal processing algorithms, architectures, and implementations XII

This Volume 4791 of the conference proceedings contains 47 papers. Topics discussed include advanced signal processing algorithms, architectures, time-scale analysis, time-frequency analysis, real-time implementations, structured matrices, regularization techniques, image processing, wireless communication, array processing, and high-performance arithmetic for real-time applications.

关键词： algorithms

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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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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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Dominant covering

Dominant covering

引用

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

作者： Kung, HT Suter, BW Harvard Univ Div Engn & Appl Sci Cambridge MA USA USAF Res Lab Ctr Integrated Transmiss & Exploitat Rome NY USA

ISBN: (纸本)0819454974

We consider communications and network systems whose properties are characterized by the gaps of the leading eigenvalues of A(H) A for some matrix A. We show that a sufficient and necessary condition for a large eigen-gap is that A is a "hub" matrix in the sense that it has dominant columns. We describe an application of this dominant covering theory in multiple-input and multiple-output (MIMO) wireless systems.

关键词： signal to noise ratio Telecommunications Antennas Receivers Transmitters Matrices Multiplexing Analytical research Computing systems signal attenuation

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