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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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SYSTOLIC ADAPTIVE BEAMFORMING - FROM THEORY TO PRACTICE

SYSTOLIC ADAPTIVE BEAMFORMING - FROM THEORY TO PRACTICE

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CONF ON advanced signal processing algorithms, architectures, AND implementations 2

作者： HARGRAVE, P BNR Europe Ltd. (United Kingdom)

In this paper we describe aspects of an ongoing program of work aimed at the practical realization of systolic array structures to implement digital adaptive beam-forming algorithms.

ISBN: (纸本)0819406945

In this paper we describe aspects of an ongoing program of work aimed at the practical realization of systolic array structures to implement digital adaptive beam-forming algorithms.

关键词： signal processing Acoustics Antennas Algorithm development Phased arrays Prototyping Digital electronics Array processing Data processing Sensors

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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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Computer arithmetic for the processing of media signals

Computer arithmetic for the processing of media signals

引用

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

作者： Oklobdzija, VG Farooqui, AA Univ Calif Davis Dept Elect & Comp Engn ACSEL Davis CA 95616 USA

ISBN: (纸本)0819437611

Media signal processing requires high computing power and the algorithms exhibit a great deal of parallelism on low precision data. The basic components of multi-media objects are usually simple integers with 8, 12, or 16 bits of precision. In order to support efficient processing of media signals, Instructions Set Architecture (ISA) of the traditional processors requires modifications. In this paper, we present the quantitative analysis and the computational complexity required to perform media processing. Main classes of instructions that are needed for the required level of performance of the Media Processor are identified. Their efficient implementation and effect on the processor data-path is discussed. The main operations required in media processing are Addition (with or without saturation), Multiplication (with or without rounding), Sum of Products, and Average of two numbers.

关键词： ISG SIMD VLSI media processor MPEG media arithmetic IDCT FFT addition multiplication

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Wigner equations of motion for classical systems

Wigner equations of motion for classical systems

引用

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

作者： Galeani, L Cohen, L CUNY New York NY 10021 USA

ISBN: (纸本)0819437611

We present a general procedure for obtaining equations of motion for the Wigner distribution of functions that are governed by ordinary and partial differential equations. For the case of fields we show that in general one must consider Wigner distributions of the four variables, position, momentum, time and frequency. We also show that in general one cannot write an equation of motion for position and momentum however it can be done in some cases, the Schrodinger equation being one such case. Our method leads to an equation of motion for the Schrodinger equation with time dependent potentials in contrast to the result obtained by Wigner and Moyal which was for time independent potentials.

关键词： Ordinary differential equations Partial differential equations Fourier transforms Oscillators Differential equations Acoustics Electromagnetism signal processing Switches

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Generalized reaction-diffusion equation for image processing

Generalized reaction-diffusion equation for image processing

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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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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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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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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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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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