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

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Window design for signal-dependent spectrogram using optimal kernel techniques 6

Window design for signal-dependent spectrogram using optimal...

引用

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

作者： Carson, CC Baraniuk, RG UNIV CALIF BERKELEY DEPT ELECT ENGN & COMP SCIBERKELEYCA 94720

ISBN: (纸本)0819422347

Time-frequency distributions (TFDs) have proven useful in a wide variety of nonstationary signal processing applications. While sophisticated optimal bilinear TFDs have been developed to extract the maximum possible time- frequency information from signals, certain applications dictate simpler linear, running-FFT processing techniques. In this paper, we propose a signal-dependent short-time Fourier transform/spectrogram that enjoys many of the advantages of optimal bilinear TFDs yet retains the simplicity and efficiency of running-FFT processing. In addition, we extend the optimal kernel design problem to linear spaces of signals.

关键词： time-frequency analysis spectrogram Wigner distribution optimal kernel design

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Denoising using time-frequency and image processing methods

Denoising using time-frequency and image processing methods

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

作者： Nelson, D Cristóbal, G Kober, V Cakrak, F Loughlin, P Cohen, L US Dept Def Ft Meade MD 20755 USA

ISBN: (纸本)0819432938

We present a number of methods that use image and signed processing techniques for removal of noise from a signal. The basic idea is to first construct a time-frequency density of the noisy signal. The time-frequency density, which is a function of two variables, can then be treated as an "image", thereby enabling use of image processing methods to remove noise and enhance the image. Having obtained an enhanced time-frequency density, one then reconstructs the signal. Various time frequency-densities are used and also a number of image processing methods are investigated. Examples of human speech and whale sounds are given. In addition, new methods are presented for estimation of signal parameters from the time-frequency density.

关键词： Electronic filtering Interference (communication) Fourier transforms Time-frequency analysis Frequency modulation Fermium Transform theory signal processing Optical filters Filtering (signal processing)

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A BER analysis of a space-time signal processing scheme that combines transmitter diversity with beamforming

A BER analysis of a space-time signal processing scheme that...

引用

conference on advanced signal processing algorithms architectures and implementations xiiI

作者： Kim, I Chun, J Korea Adv Inst Sci & Technol Comp Sci Lab Dept EECS Taejon 305701 South Korea

ISBN: (纸本)0819450782

We introduce a new space-time signal processing scheme that uses both transmitter diversity technique and beamforming technique for code-division multiple access (CDMA) systems. The introduced scheme achieves the diversity gain over Rayleigh fading channel through the transmitter diversity technique, and the signal-to-noise ratio (SNR) gain by the beamforming technique. Bit error rate (BER) analyses are given each of the three cases in which the transmitter diversity, beamforming and introduced combined scheme are used, in the frequency-flat Rayleigh fading channel. The analytic results are shown to coincide with the Monte-Carlo simulation results. We show that the combined scheme is more robust to the channel correlation and the speed of mobile than the diversity and beamforming scheme. Furthermore, the combined scheme gives a reduced multiple-access-interference because of its beamforming capability.

关键词： diversity beamforming space-time spreading CDMA

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A Jacobi method for signal subspace computation

A Jacobi method for signal subspace computation

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

作者： Paul, S Gotze, J Institute for NTCD TU Munich D-80290 Munich Germany

ISBN: (纸本)0819425842

The Jacobi method for singular value decomposition is well-suited for parallel architectures. Its application to signal subspace computations is well known. Basically the subspace spanned by singular vectors of large singular values are separated from subspace spanned by those of small singular values. The Jacobi algorithm computes the singular values and the corresponding vectors in random order. This requires sorting the result after convergence of the algorithm to select the signal subspace. A modification of the Jacobi method based on a linear objective function merges the sorting into the SVD-algorithm at little extra cost. In fact, the complexity of the diagonal processor cells in a triangular array get slightly larger. In this paper we present these extensions, in particular the modified algorithm for computing the rotation angles and give an example of its usefulness for subspace separation.

关键词： subspace methods singular value decomposition Jacobi method parallel architecture optimization on manifolds Lie groups

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

Proceedings of SPIE: Advanced signal processing algorithms, ...

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Advance signal processing algorithms, Atchitectures, and implementations VIII

The proceedings contains 58 papers from the conference of SPIE: advanced signal processing algorithms, architectures, and implementations VIII. The topics discussed include: blind channel identification and extraction of more sources than sensors;blind channel estimation for CDMA systems with orthogonal modulation;blind equalization and source separation with MSK inputs and adaptive blind channel estimation by least-squares smoothing for CDMA.

关键词： signal processing

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advanced signal processing algorithms, architectures, and implementations II

Advanced Signal Processing Algorithms, Architectures, and Im...

引用

advanced signal processing algorithms, architectures, and implementations II

The Volume contains 44 conference papers. The topic covered include Toeplitz matrices, time-frequency distribution and nonstationary signals, bit-level systolic arrays and computer arithmetic, radar signal processing,... 详细信息

ISBN: (纸本)0819406945

关键词： signal processing

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Analytical approximations of translational subpixel shifts in signal and image registrations

Analytical approximations of translational subpixel shifts i...

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conference on advanced signal processing algorithms, architectures, and Implementantions XVIII

作者： Zhang, Qiang Wake Forest Univ Hlth Sci Biostat Sci Dept Winston Salem NC 27157 USA

ISBN: (纸本)9780819472946

Analytical approximations of translational subpixel shifts in both signal and image registrations are derived by setting the derivatives of a normalized cross correlation function to zero and solving them. Without the need of iterative searching, this methods achieves a complexity of only O(mn), given an image size of m x n. Without the need to upsample, computation memory is also saved. Tests using simulated signals and images show good results.

关键词： Subpixel image registration image superresolution

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signal arrival times

Signal arrival times

引用

conference on advanced signal processing algorithms architectures and implementations xiiI

作者： Hughes, DH USAF Res Lab Ctr Integrated Transmiss & Exploitat Rome NY 13441 USA

ISBN: (纸本)0819450782

A femtosecond electromagnetic pulse propagating in a linear dispersive medium is analyzed in phase spaces of (space, wave number) and (time, frequency). First moment densities are computed as eigenvalues of differential operators acting on Hilbert ray representations of the pulse in relevant domains. These moment densities are used as metrics in the relevant phase spaces to measure the local mean values and their deviations in position and wavenumber, and in time and frequency. For example, arrival times of the pulse over its spectral content are computed as the mean arrival time at a particular frequency to within one half the local deviation at that frequency. These metrics on the pulse are compared to the relevant phase space Wigner distribution.

关键词： space-time signal analysis local moments Wigner distribution time-frequency dispersion wave propagation FDTD moment densities instantaneous frequency

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Design and evaluation of on-line arithmetic for signal processing applications on FPGAs

Design and evaluation of on-line arithmetic for signal proce...

引用

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

作者： Galli, R Tenca, AF Oregon State Univ Dept Elect & Comp Engn Corvallis OR 97331 USA

ISBN: (纸本)0819441880

This paper shows the design and the evaluation of on-line arithmetic modules for the most common operators used in DSP applications, using FPGAs as the target technology. The designs are highly optimized for the target technology and the common range of precision in DSP. The results are based on experimental data collected using CAD tools. All designs are synthesized for the same type of devices (Xilinx XC4000) for comparison, avoiding rough estimates of the system performance, and generating a more reliable and detailed comparison of on-line signal processing solutions with other 'state of the art' approaches, such as distributed arithmetic. We show that on-line designs have a hard stand for basic DSP applications that use only addition and multiplication. However, we also show that on-line designs are able to overtake other approaches as the applications become more sophisticated, e.g. when data dependencies exist, or when non constant multiplicands restrict the use of other approaches.

关键词： on-line arithmetic signal processing DSP FPGA Xilinx XC4000

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Architecture for real time wood inspection

Architecture for real time wood inspection

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

作者： Malasne, N Paindavoine, M Lab Elect & Informat Image F-21078 Dijon France

This study has been realized to improve industrial machines that allow to analyze planks by detecting their width and too important defects thanks to a computer vision system. These machines are currently piloted by s... 详细信息

ISBN: (纸本)0819437611

关键词： real time processing defects detection FPGA

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