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检索条件"任意字段=Advanced Signal Processing Algorithms, Architectures, and Implementations VI 1996"

共 109 条记录，以下是61-70 订阅

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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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BOOTSTRAP - THEORY AND APPLICATIONS 4

BOOTSTRAP - THEORY AND APPLICATIONS

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

作者： ZOUBIR, AM Queensland Univ. of Technology (Australia)

ISBN: (纸本)0819412767

This is a review of bootstrap methods, concentrating on basic ideas and applications. It begins with an exposition of the bootstrap principle and gives several examples of its use. Bootstrap methods for testing statistical hypotheses are then reviewed and an analysis of accuracy of bootstrap tests is provided. We discuss how the bootstrap can be used to estimate variance stabilizing transformations that are crucial for the level of accuracy of bootstrap tests. Finally, we describe an application of multiple bootstrap tests to the problem of finding optimum locations of vibration sensors for knock detection in spark ignition engines.

关键词： Statistical analysis Sensors signal processing Combustion Fourier transforms signal to noise ratio Autoregressive models Error analysis Monte Carlo methods Data modeling

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A NEW ALGORITHM FOR RATIONAL SUBSPACE ESTIMATION BASED ON CASCADABLE ADAPTIVE LOSSLESS FILTERS 4

A NEW ALGORITHM FOR RATIONAL SUBSPACE ESTIMATION BASED ON CA...

引用

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

作者： FIJALKOW, I LOUBATON, P REGALIA, PA Telecom Paris Dept. Signal 46 rue Barrault Paris Cedex 13 75634 France Institut National des Telecommunications 9 rue Charles Fourier Evry Cedex 91011 France

ISBN: (纸本)0819412767

In a previous work, a time domain algorithm was proposed to adaptively estimate a rational and orthonormal spanning of a rational subspace. However, its convergence was not proved and it seems that asymptotic misbehaviour may occur. A new algorithm is proposed, for which satisfactory convergence properties hold. It provides robustness with regard to the signal model and shows an especially good asymptotical performance for small SNR. © 1993 SPIE. All rights reserved.

关键词： Time domain analysis

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COHERENT signal-SUBSPACE processing FOR NEAR-FIELD BROAD-BAND SOURCE LOCALIZATION 4

COHERENT SIGNAL-SUBSPACE PROCESSING FOR NEAR-FIELD BROAD-BAN...

引用

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

作者： LIN, S HUNG, HS Iowa State Univ. (United States)

ISBN: (纸本)0819412767

In this paper, the coherent signal-subspace method (CSM) is extended for estimation of bearing, elevation and range of multiple, near-field, broad-band sources. Analytical results are also derived to justify the effectiveness of the near-field CSM. It is shown that the coherently averaged sample covariance matrix in the near-field CSM has complex Wishart distribution with number of degrees-of-freedom equaling the time-bandwidth product, provided that (1) the frequency components of the array output are statistically independent and Gaussian distributed, and (2) the errors between all the actual source locations and the preliminary estimate of the source cluster center are upperly bounded by a small constant. Some simulation results are provided to show the effectiveness of the near-field CSM.

关键词： Near field signal processing Error analysis Sensors Statistical analysis Data modeling Interference (communication) signal to noise ratio Source localization Spherical lenses

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NUMERICAL-INTEGRATION OF PDES BY DISCRETE PASSIVE MODELING OF PHYSICAL SYSTEMS 4

NUMERICAL-INTEGRATION OF PDES BY DISCRETE PASSIVE MODELING O...

引用

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

作者： FETTWEIS, A Ruhr-Univ. Bochum (Germany)

ISBN: (纸本)0819412767

A new method for numerically integrating partial differential equations (PDEs) has been under study for the last few years. This method is based on principles of multidimensional (MD) Kirchhoff circuits and multidimensional wave digital filters (MD WDFs), which explains why it has probably not been discovered earlier. It makes wide use of methods and results that have been developed by extensive research in the areas of circuit theory and digital signal processing, but that are rather unknown outside of the small circle of experts on MD WDFs. Instead of talking about MD WDFs we prefer using, within the context of numerical integration, the designation `discrete multidimensionally passive (MD-passive) dynamical systems.'

关键词： Palladium Wigner distribution functions Systems modeling Neodymium Numerical integration Digital electronics Digital signal processing signal processing Digital filtering Partial differential equations

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signal-ADAPTIVE DECOMPOSITION OF MULTICOMPONENT signalS 4

SIGNAL-ADAPTIVE DECOMPOSITION OF MULTICOMPONENT SIGNALS

引用

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

作者： ASSALEH, KT MAMMONE, RJ Rutgers Univ. (United States)

ISBN: (纸本)0819412767

In this paper we present a new method for adaptively decomposing a multicomponent signal into its components. This method is based on fitting an autoregressive (AR) model to the short-time spectra of the signal. The AR parameters represent the coefficients of the linear predictive (LP) polynomial. The roots of this polynomial constitute a set of center frequencies and bandwidths that characterize the modes of the signal. The decomposition process is achieved by applying a time-varying filter bank to the original multicomponent signal. The characteristics of this filter bank are derived from a subset of the roots of the LP polynomial. We have developed a constraining algorithm to determine that subset based on the boundedness of the bandwidths, and the temporal continuity of the center frequencies of the components. We have applied the proposed decomposition method for the separation of the formants of speech signals.

关键词： Autoregressive models signal to noise ratio Electronic filtering Composites Digital filtering Algorithm development signal processing Image segmentation Resonators Time-frequency analysis

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PIPELINED ADAPTIVE DFE architectures 4

PIPELINED ADAPTIVE DFE ARCHITECTURES

引用

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

作者： SHANBHAG, NR PARHI, KK Univ. of Minnesota/Twin Cities (United States)

ISBN: (纸本)0819412767

Fine-grain pipelined adaptive decision-feedback equalizer (ADFE) architectures are developed using the relaxed look-ahead technique. This technique, which is an approximation to the conventional look-ahead computation, maintains functionality of the algorithm rather than the input-output behavior. Thus, it results in substantial hardware savings as compared to either parallel processing or look-ahead techniques. The delay relaxation, delay transfer relaxation, and sum relaxation are introduced for purposes of pipelining. Both the conventional and the predictor form of ADFE have been pipelined. The performance of the pipelined algorithms for the equalization of a magnetic recording channel is studied. It is demonstrated via simulations that, for a byte error rate of 10^-7 or less, speed-ups of up to 8 can be easily achieved with the conventional ADFE. The predictor form of ADFE allows much higher speed-ups (up to 32) for less than 1 dB of SNR degradation.

关键词： signal to noise ratio Magnetism Algorithm development Error analysis Optical filters Digital filtering Finite impulse response filters Nonlinear filtering Parallel processing Transform theory

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DETECTION OF NON-GAUSSIAN signalS USING INTEGRATED POLYSPECTRUM 4

DETECTION OF NON-GAUSSIAN SIGNALS USING INTEGRATED POLYSPECT...

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

作者： TUGNAIT, JK Auburn Univ. (United States)

ISBN: (纸本)0819412767

We consider the problem of detecting an unknown, random, stationary, non-Gaussian signal in Gaussian noise. The most commonly used method for this problem is the so-called energy detector which can not distinguish between Gaussian and non-Gaussian signals. Recently the use of bispectrum and/or trispectrum of the signal has been suggested for improving detection performance for non-Gaussian signals. In this paper we suggest the use of an integrated polyspectrum (bispectrum or trispectrum) to possibly further enhance detection performance and to improve computational efficiency of the detectors based upon polyspectrum. We investigate conditions under which use of the integrated bispectrum is appropriate. The detector structure is derived and its performance is evaluated via simulations and comparisons with several other existing approaches.

关键词： signal detection Information technology Tantalum Sensors Statistical analysis Monte Carlo methods signal processing Interference (communication) Fourier transforms Integration

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TOMOGRAPHIC IMAGING OF THE IONOSPHERE USING BIDIRECTIONAL EXTRAPOLATION ALGORITHM 4

TOMOGRAPHIC IMAGING OF THE IONOSPHERE USING BIDIRECTIONAL EX...

引用

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

作者： NA, HR LEE, H SHEN, J Univ. of Iowa (United States) Univ. of California/Santa Barbara (United States)

ISBN: (纸本)0819412767

In this paper, a new Fourier domain reconstruction algorithm is presented which utilizes the information contained in the known region of the spectrum to estimate the frequency samples in the missing-cone area. Unlike conventional two-dimensional extrapolation techniques, this method uses bi-directional extrapolation to maximize the amount of known information in each extrapolation step. By fully utilizing the information of the measured data, the resulting image provides a more accurate estimation of the electron density distribution. The resolution improvement achieved is mainly due to the proper utilization of the available information in the measurements during the image formation process.

关键词： Tomography Statistical analysis Data acquisition Reconstruction algorithms Image processing Satellites Image resolution Image acquisition signal detection Computer engineering

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DIRECTION-OF-ARRIVAL TRACKING BY PARALLEL ARRAY-processing 4

DIRECTION-OF-ARRIVAL TRACKING BY PARALLEL ARRAY-PROCESSING

引用

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

作者： PEREZNEIRA, A LAGUNAS, MA ETSI Telecommunication (Spain)

ISBN: (纸本)0819412767

Antenna arrays collect multidimensional data that contains signals arriving from different sources. Neural Network architectures can separate the different signals, thus enabling parallel processing structures. These structures can solve a multi-signal estimation problem more efficiently than the corresponding single signal estimator. Various of these parallel architectures are evaluated in the context of array signal processing. Specifically, the scheme developed in this paper (section 2) uses the spatial diversity supplied by the aperture associated with the sensors to separate the signals and to apply them to a bank of parallel adaptive filters. These filters are then designed in accordance with a mean square error minimization criterion (i.e., a criterion based on Second Order Statistics). As Second Order Statistics assume linearity or Gaussianity they are sometimes overly restrictive. It is shown how High Order Statistics can be very useful when more general criteria such as statistical independence between the signals to be separated are imposed.

关键词： Array processing Sensors Phased arrays signal processing Antennas Digital filtering Filtering (signal processing) Error analysis Electronic filtering Mobile communications

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