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IEEE Conference on Decision and Control

作者： R. Agrawal M. Hegde D. Teneketzis Department of Electrical Engineering and Computer ScienceCommunications and Signal Processing Laboratory University of Michigan Ann Arbor MI USA

We consider multi-armed bandit problems with switching cost, and present asymptotically optimal adaptive allocation schemes. We illustrate an optimal allocation scheme for a large class of distributions which includes... 详细信息

关键词： Cost function Optimal control Communication system control Communication switching Adaptive signal processing Laboratories Programmable control Adaptive control Resource management Statistics

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VLSI Array processing strctures of quadratic digital filters with LMS algorithm

VLSI Array processing strctures of quadratic digital filters...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Yuang Lou C. Nikias A. Venetsanopoulos Communications and Digital Signal Processing Laboratory Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Electrical Engineering University of Toronto Toronto Canada

There are many significant applications of nonlinear adaptive digital filters such as the cancellation of echoes and intersymbol interference, the equalization of transmission channels, adaptive noise cancellation and design of optimal predictors in communication systems. In this paper, we introduce a class of efficient architectures for adaptive quadratic digital filters based on the LMS algorithm and on rank compressed lower-upper (LU) triangular decomposition method. The architectures exhibit high parallelism as well as modularity and regularity. They are mapped into parallel pipeline and systolic array implementations and are evaluated on hardware cost (in bits), and data throughput delay.

关键词： Very large scale integration Array signal processing Digital filters Least squares approximation Interference cancellation Intersymbol interference Adaptive equalizers Noise cancellation Pipelines Systolic arrays

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Set-membership theory applied to linear prediction analysis of speech

Set-membership theory applied to linear prediction analysis ...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J. Deller T. Luk Digital Signal Processing Laboratory: Speech Processing Sector Department of Electrical and Computer Engineering Northeastern University Boston MA USA Baldwin Technologies Corporation Country Side IL USA

The theory of set membership (SM) identification is formulated, and applied to linear prediction (LP) analysis of speech. The LP parameters of a simulated vowel are identified as an illustration. The SM strategy resul... 详细信息

关键词： Speech analysis Samarium Speech processing Least squares methods Covariance matrix Vectors Equations Recursive estimation Digital signal processing Laboratories

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Recognition of Cerebral Palsy speech: Technical method and a study of vowel consistency

Recognition of Cerebral Palsy speech: Technical method and a...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J. Deller D. Hsu L. Ferrier Digital Signal Processing Laboratory Speech Processing Sector Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Speech and Language Pathology and Audiology Northeastern University Boston MA USA

A method for recognition of speech of the nonverbal is presented. Results of the application of the procedure to simple utterances by cerebral palsied individuals and implications for an overall communications device ... 详细信息

关键词： Speech recognition Birth disorders Artificial intelligence Speech processing Natural languages Loudspeakers Digital signal processing Laboratories Pathology Application software

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RECURSIVE BLOCK CODING - A NEW APPROACH TO TRANSFORM CODING

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IEEE TRANSACTIONS ON COMMUNICATIONS 1986年第2期34卷 161-179页

作者： FARRELLE, PM JAIN, AK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

The concept of fast KL transform coding introduced earlier [7], [8] for first-order Markov processes and certain random fields has been extended to higher order autoregressive (AR) sequences and practical images yielding what we call recursive block coding (RBC) algorithms. In general, the rate-distortion performance for these algorithms is significantly superior to that of the conventional block KL transform algorithm. Moreover, these algorithms permit the use of small size transforms, thereby removing the need for fast transforms and making the hardware implementation of such coders more appealing. This improved performance has been verified for practical image data and results in suppression of the block-boundary effect commonly observed in traditional transform coding techniques. This is illustrated by comparing RBC with cosine transform coding using both one- and twodimensional algorithms. Examples of RBC encoded images at various rates are given.

关键词： Transform coding Karhunen-Loeve transforms Block codes Data compression Image coding signal processing Image processing Bit rate Markov processes Rate-distortion

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ON THE SPECTRUM OF PSEUDO NOISE

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PROCEEDINGS OF THE IEEE 1986年第4期74卷 608-609页

作者： GARDNER, WA CHEN, CK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

Although the magnitude of the discrete Fourier transform of a maximal-length shift-register sequence is flat, except for its value at zero frequency, the higher resolution spectral content given by the Fourier-series transform is highly erratic. This little-known fact is described, and its ramifications on fast Fourier transforms of one-digit-extended pseudo noise and zero-padded pseudo noise are explained.

关键词： Discrete Fourier transforms Autocorrelation Frequency Interpolation Fourier transforms White noise Fast Fourier transforms Prediction algorithms Fourier series signal processing

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FACTOR INVERSE MATCHED FILTERING

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JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 1986年第1期79卷 91-99页

作者： BIRDSALL, TG METZGER, K Communications and Signal Processing Laboratory Electrical Engineering and Computer Science Department The University of Michigan Ann Arbor Michigan 48109

Factor inverse matched filtering (FIMF) and factor inverse filtering (FIF) are signal processing techniques used to obtain desired signal responses. Both are especially useful procedures for ‘‘pulse‐compression’’ processing and channel measurements. The theory is developed for a simple channel and known noise power spectral density so that comparison may be made with matched filtering. Expressions for the pulse‐compression energy gain, nonflatness loss NFL, and total performance are derived. The NFL is useful in selecting the best among practical pulse‐compression modulations, and with FIMF and FIF, has been used extensively since 1974 by the authors and their co‐workers in underwater acoustic propagation measurements and ocean acoustic tomography.

关键词： ACOUSTICS

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THE ROLE OF SPECTRAL CORRELATION IN DESIGN AND PERFORMANCE ANALYSIS OF SYNCHRONIZERS

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IEEE TRANSACTIONS ON COMMUNICATIONS 1986年第11期34卷 1089-1095页

作者： GARDNER, WA Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

The popular class of synchronizers that consist of a quadratic nonlinearity followed by a phase-lock loop is investigated, and it is shown that the optimum design of the quadratic transformation is characterized in terms of a spectral correlation function for the signal to be synchronized to. It is also shown that the SNR performance of this quadratic transformation, and the mean-square phase jitter of the phaselock loop are both characterized in terms of spectral correlation functions. The conditions under which the optimum quadratic transformations, for symbol synchronization of BPSK, QPSK, SQPSK, and MSK, and for carrier synchronization of BPSK, reduce to the well-known matched-filter-squarer are identified. In addition, the well-known zeromean-square-phase-jitter condition is generalized from PAM to all synchronizable signals, and is characterized in terms of the spectral correlation function. The low-SNR maximum-likelihood synchronizer for all quadratically synchronizable signals is characterized in terms of a multiplicity of maximum-SNR quadratic spectral-line generators. A closed form implementation in terms of a matched filter, squarer, and symbol-rate-synchronized averager is obtained for BPSK and QPSK signals.

关键词： Performance analysis Frequency synchronization Binary phase shift keying Quadrature phase shift keying Timing Jitter signal generators Matched filters Oscillators Clocks

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DIFFERENTIAL AND INTEGRAL METHODS FOR multidimensional INVERSE SCATTERING PROBLEMS

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JOURNAL OF MATHEMATICAL PHYSICS 1986年第10期27卷 2584-2591页

作者： YAGLE, AE Communications and Signal Processing Laboratory Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109

A layer stripping procedure for solving three‐dimensional Schrödinger equation inverse scattering problems is developed. This procedure operates by recursively reconstructing the Radon transform of the potential from the jump in the Radon transform of the scattered field at the wave front. This reconstructed potential is then used to propagate the wave front and scattered field differentially further into the support of the potential. The connections between this differential procedure and integral equation procedures are then illustrated by the derivations of two well known exact integral equation procedures using the Radon transform and a generalized Radon transform. These procedures, as well as the layer stripping procedure, are then reduced to the familiar Born approximation result for this problem by neglecting multiple scattering events. This illustrates the central role of the Radon transform in both exact and approximate inversion procedures.

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Ray tracing parametric surface patches utilizing numerical techniques and ray coherence 86

Ray tracing parametric surface patches utilizing numerical t...

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13th Annual Conference on computer Graphics and Interactive Techniques, SIGGRAPH 1986

作者： Joy, Kenneth I. Bhetanabhotla, Murthy N. Signal and Image Processing Laboratory Computer Science Division Department of Electrical and Computer Engineering University of California Davis United States

ISBN: (纸本)0897911962

A new algorithm for ray tracing parametric surface patches is presented. The method uses quasi-Newton iteration to solve for the ray/surface intersection and utilizes ray-to-ray coherence by using numerical information from adjoining rays as initial approximations to the quasi-Newton algorithm. Techniques based upon object space subdivision are used to insure convergence to the correct intersection point. Examples are given of the use of the algorithm in scenes containing Bézier surface patches. Results show that a significant number of ray/surface intersections on these parametric surface patches can be found using very few iterations, giving a significant computational savings. © 1986 ACM.

关键词： Ray tracing

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