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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31-40 订阅

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Time-frequency representations of astronomical signals

Time-frequency representations of astronomical signals

引用

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

作者： Rao, AW Cohen, L Scargle, JD CUNY/Hunter College (United States) NASA Ames Research Ctr. (United States)

ISBN: (纸本)0819425842

We discuss applications of time-frequency analysis to the investigation of astronomical type signals. In particular, we apply time-frequency techniques to a data set consisting of the kinetic energy in the three body problem We explain how the methods of time-frequency analysis shed light on these signals and also how the concept of multicomponent signals is applied to their decomposition. We also discuss methods to do simple filtering and estimation of the signal parameters.

关键词： Time-frequency analysis Astronomy signal analyzers Electronic filtering Optical filters Bandpass filters Fourier transforms Iterated function systems signal processing Strontium

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A method to identify and restore a class of aliased signals

A method to identify and restore a class of aliased signals

引用

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

作者： Loughlin, P Walia, A Univ Pittsburgh Pittsburgh PA 15261 USA

ISBN: (纸本)0819454974

When a continuous-time signal is sampled at a rate less than the Nyquist criterion, the signal is aliased. This distortion is usually irrecoverable. However, we show that for certain AM-FM signals, the distortion due to aliasing can be mitigated and an unaliased version of the signal can be recovered from its aliased samples. We present a method for determining whether or not a signal has potentially been distorted by aliasing and an algorithm for recovering an unaliased version of the signal. The method is based on the manifestation of aliasing in the time-frequency plane, and estimating the instantaneous phase/frequency of the aliased signal.

关键词： Time-frequency analysis Distortion signal analyzers Amplitude modulation Fourier transforms signal generators Spectrographs Statistical analysis Fermium Frequency modulation

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Real time correlation processing of television communication channel video data

Real time correlation processing of television communication...

引用

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

作者： Larkin, A Volkov, L Moscow Engn Phys Inst Coherent Photon Ctr Moscow 115409 Russia

ISBN: (纸本)0819441880

Electron-optical image converters (EOIC) have been known to be useful in recording and investigating highspeed processes, nuclear physics experiments, automatic environmental control, medicine etc. In this paper the cathode ray tubes with the cathodoluminescent screen having a sufficiently high level of the radiation temporal coherence (particularly on the basis of rare-earth phosphors) are proposed to be utilised as devices for the dynamic data input into the holographic correlator for realisation of TV signal recognition in real time. This approach allows combining both the radiation source and the spatial light modulator functions in one compact device.

关键词： Image processing Holography CRTs Optical correlators Data communications Temporal coherence Televisions Data processing Video Video processing

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

Proceedings of SPIE - Advanced signal processing: Algorithms...

引用

advanced signal processing: algorithms, architectures and implementations VII

The proceeding contains 53 papers from the conference of SPIE advanced VIII signal processing: algorithms, architectures, and implementations. The topics:include pattern recognition under translation and scale changes, instanteous frequency of a propagating pulse;data-driven time-frequency and time-scale detectors;time-varying frequencies of a signal;circulant preconditioners from B-splines;extensions to total variation denoising and Jacobi method for signal subspace computation.

关键词： signal processing

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Identification of a multicomponent signal by a TEA scheme operating in the Time-Frequency plane

Identification of a multicomponent signal by a TEA scheme op...

引用

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

作者： Lo Presti, L Olmo, G Galleani, L Politecn Torino Dipartimento Elettron I-10129 Turin Italy

ISBN: (纸本)0819432938

In this paper, a method for signal component separation, operating in the Time-Frequency (TF) plane and employing a Turbo Estimation Algorithm (TEA), is described. A novel 2D distribution is proposed, named Two Window Spectrogram (TWS), which is free from crossterms and able to yield good time anti frequency resolution. Then, a set of parameters is defined in the time-frequency plane, which are able to carry the relevant information on the signal components. An algorithm of estimation of these parameters is proposed, making use of a TEA scheme to yield improved performance. The algorithm has been tested by simulation, yielding very encouraging performance.

关键词： Thermal weapon sites Time-frequency analysis Detection theory Interference (communication) Prototyping signal processing signal to noise ratio Tantalum Yield improvement Fourier transforms

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Random array processing for micromachined sensor network

Random array processing for micromachined sensor network

引用

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

作者： Yao, K Reed, C Hudson, R Lorenzelli, F Univ. of California/Los Angeles (United States)

ISBN: (纸本)0819425842

This paper considers ''blind beamforming'' operations on a wireless network of randomly distributed MEM sensors. Maximum power collection criterion is proposed and results in array weights obtained from the eigenvector corresponding to largest eigenvalue of a matrix eigenvalue problem. Theoretical justification of this approach to an extension of Szego's asymptotic distribution of eigenvalues is provided. Numerical results on propagation time delay estimation and loss of coherency due to propagation disturbances are presented.

关键词： random array array processing beamforming MEM sensor sensor network

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VLSI Digital signal processing: Some arithmetic issues 6

VLSI Digital Signal Processing: Some arithmetic issues

引用

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

作者： Jullien, GA UNIV WINDSOR VLSI RES GRP WINDSOR ON N9B 3P4 CANADA

ISBN: (纸本)0819422347

In this review paper we discuss selected issues associated with the implementation of arithmetic for VLSI Digital signal Processors. We start with a Silicon Technology Roadmap view of the next decade, in order to grasp some of the issues facing the next generation of VLSI designers, particularly associated with high performance DSP systems. We use this roadmap to open the discussion on the role basic arithmetic operations play in the construction of DSP systems; in particular we look at the interplay between algorithms, architecture, arithmetic representation and circuit implementation. Many of the illustrative examples are taken from work conducted in the VLSI Research Group, University of Windsor over the past few years, including on- going work.

关键词： VLSI Digital signal processing computer arithmetic number systems pipelined circuits

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Towards a theory of information processing on the time-frequency plane

Towards a theory of information processing on the time-frequ...

引用

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

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

ISBN: (纸本)0819454974

Information processing theory aims to quantify, how well signals encode information and how well systems process information. Time-frequency distributions have been used to represent the energy distribution of time-varying signals for the past twenty years. There has been a lot of research on various properties of these representations. However, there is a general lack of quantitative analysis in describing the amount of information encoded into a time-frequency distribution. This paper aims to quantify how well time-frequency distributions represent information by using information-theoretic distance measures. Different distance measures, such as Kullback-Leibler distance, Renyi distance, will be adapted to the time-frequency plane. Their performance in quantifying the information in a given signal will be compared. A sensitivity analysis for different distance measures will be carried out to assess their robustness under perturbation. Different example signals will be considered for illustrating the information processing in time-frequency distributions.

关键词： Data processing

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Space-time adaptive processing and subband array implementations

Space-time adaptive processing and subband array implementat...

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conference on advanced signal processing algorithms architectures and implementations XIII

作者： Zhang, YM Yang, KH Amin, MG Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)0819450782

Inter-symbol interference (ISI) and co-channel interference (CCI) are two major sources to signal impairment in mobile communications. To suppress both ISI and CCI, space-time adaptive processing (STAP) systems are shown to be effective, leading to increased capacity and improved quality of service. The high complexity and slow convergence, however, are often the hurdles in practical implementation of the STAP systems. Several subband array implementations have been proposed for STAP over the past a few years. These methods are to provide optimal or sub-optimal steady state performance with reduced implementation complexity and improved convergence performance. The purpose of this paper is to investigate the steady state performance of subband arrays with different decimation rates and to derive analytical expressions of the minimum mean square error (MMSE). The discrete Fourier transform (DFT) based subband arrays and both unconstrained and constrained weight adaptations are considered.

关键词： space-time adaptive processing subband array filter banks array processing mobile communication inter-symbol interference co-channel interference

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Web-based distributed processing tools for crop classification using CGDI databases

Web-based distributed processing tools for crop classificati...

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conference on advanced signal processing algorithms architectures and implementations XIII

作者： Lampropoulos, G Chan, J Bardas, A McNairn, H Low, B AUG Signals Ltd Toronto ON M4V 1K7 Canada

ISBN: (纸本)0819450782

This paper is devoted to change detection for precision agriculture. It presents a new change detection methodology and an overview of an online image processing tool (***) with direct applicability for crop classification. The change detection algorithms discussed in the paper will be implemented on the web. They preserve the fine details of the pixel changes and furthermore may be used for crop classification. Image registration, calibration/normalization, pixel level transformations, clutter suppression and pixel level change detection are discussed and new technologies are presented. The effectiveness of the proposed technology is being tested on real SAR data with partial truthing.

关键词： crop classification change detection distributed processing

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