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检索条件"任意字段=Advanced Signal Processing Algorithms, Architectures, and Implementations 1990"

共 435 条记录，以下是91-100 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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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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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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PERFORMANCE-MEASURES FOR COUPLED DIGITAL PHASE-LOCKED LOOPS FOR THE SEPARATION OF COCHANNNEL signalS

PERFORMANCE-MEASURES FOR COUPLED DIGITAL PHASE-LOCKED LOOPS ...

引用

CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： HEDSTROM, BA KIRLIN, RL Univ. of Victoria (Canada)

ISBN: (纸本)081940943X

Coupled digital phase-locked loops (CDPLLs), derived from extended Kalman filter theory, have been shown to suppress adjacent and co-channel interferers. This paper addresses the ability of these CDPLLs to separate co-channel signals. State observability criteria are defined and examined for non-linear state observations which model phase modulation. These metrics can then be used to address signal separation and tracking behavior of CDPLLs.

关键词： Error analysis signal processing Receivers Modulation Phase modulation Phase shift keying Stochastic processes Analog electronics Filtering (signal processing) Digital filtering

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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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PARALLEL IMPLEMENTATION OF SOME FAST ADAPTIVE algorithms ON A DIGITAL signal PROCESSOR (DSP) NETWORK

PARALLEL IMPLEMENTATION OF SOME FAST ADAPTIVE ALGORITHMS ON ...

引用

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

作者： REYNAUD, R CHEBIRA, A DEMOMENT, G Univ. de Paris-Sud (France)

ISBN: (纸本)0819406945

Several important problems in signal processing, such as linear prediction, linear regression, or spectrum factorization, need close-to-Toeplitz matrices to be factored. To solve these problems, several fast algorithms have been derived. They differ by the kind of adaptivity (block processing or exponential weighting of the data) and by the kind of recursion (order or time recursion), but they all have a common vector ladder recursion, involving an hyperbolic rotation. These algorithms are therefore well suited for implementation on an array processor. But there exists a number of applications where an efficient parallel implementation of these algorithms on a DSP network would be very attractive. The redundancy suppression, which is performed in the equations to get a fast algorithm, destroys the processing regularity of the corresponding standard algorithms, which prevents efficient high level parallel implementation. Auxiliary quantities, such as generalized reflections coefficients, are introduced that don't have the same dimensions as primary quantities. As a result there is a loss of efficiency in such tasks processing, and this leads to use array partitioning in as many sub-arrays as the number of DSPs available. If the number m of DSPs is low compared to primary quantities of dimension p (m << p/m) (i.e. a low level parallelism) and if the dimension a of reflection coefficients is also low ((alpha) << p/m), the global efficiency of a parallel implementation on a DSP network may still be interesting, with in addition, the advantages associated to such a network : simple design, simple control. To illustrate this, an application of the method to a Fast Recursive Least Squares algorithm is presented.

关键词： Digital signal processing signal processing Data modeling Algorithm development Array processing Filtering (signal processing) Scattering Digital filtering Matrices Network architectures

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Space-time adaptive processing and subband array implementations

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

引用

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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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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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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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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