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

共 419 条记录，以下是261-270 订阅

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BLOCK CIRCULANT PRECONDITIONERS FOR 2-D DECONVOLUTION

BLOCK CIRCULANT PRECONDITIONERS FOR 2-D DECONVOLUTION

引用

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

作者： CHAN, RH NAGY, JG PLEMMONS, RJ Univ. of Hong Kong (Hong Kong China) Univ. of Minnesota (United States) Wake Forest Univ. (United States)

ISBN: (纸本)081940943X

Discretized 2-D deconvolution problems arising, e.g., in image restoration and seismic tomography, can be formulated as 1eas squares compuaions, mm lib— Tx112 where T is often a large-scale rectangular Toeplitz-block matrix. We consider solving such block least squares problems by the preconditioned conjugate gradient algorithm using square nonsingular circulant-block and related preconditioners, constructed from the blocks of the rectangular matrix T. Preconditioning with such matrices allows efficient implementation using the 1-D or 2-D Fast Fourier Transform (FFT). It is well known that the resolution of ill-posed deconvolution problems can be substantially improved by regularization to compensate for their ill-posed nature. We show that regularization can easily be incorporated into our preconditioners, and we report on numerical experiments on a Cray Y-MP. The experiments illustrate good convergence properties of these FET—based preconditioned iterations.

关键词： Image restoration Matrices Deconvolution Fourier transforms Point spread functions Radon Image processing Information operations Iterative methods Mathematics

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ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION 4

ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION

引用

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

作者： YU, KB GE Corporate Research and Development Ctr. (United States)

ISBN: (纸本)0819412767

An algorithm has been developed to control the antenna array beam pattern for multiple beam antenna (MBA) or phased array systems. The algorithm is motivated by military satellite communications applications where the uplink received antenna is desired to provide beamforming capability for selective earth coverage and jamming protection. The problem can be formulated as to determine the control weight to meet the user gain and jammer null requirements in their known directions subject to the norm constraint of the weight defined by the power conservation law. The algorithm makes use of an orthogonal decomposition of the weight vector into the constraint weight vector and the zero-output weight vector. If the constraint weight vector satisfies the norm bound constraint, the zero-output vector can further be optimized to minimize the deviation of the resulting weight from the quiescent weight. If the constraint weight vector does not satisfy the norm bound constraint, a recursive procedure has been developed which provides flexibility in the determination of the constraint vectors, the constraint order and the constraint phase optimization. This algorithm provides a practical means to achieve the constraints subject to the norm bound condition.

关键词： Antennas Algorithm development Phased arrays Control systems Nulling interferometry Satellite communications Telecommunications Data processing Mobile communications Receivers

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Separating desired image and signal invariant components from extraneous variations 6

Separating desired image and signal invariant components fro...

引用

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

作者： Williams, WJ Zalubas, EJ Hero, A UNIV MICHIGAN DEPT ELECT ENGN & COMP SCIANN ARBORMI 48109

ISBN: (纸本)0819422347

Images and signals can be characterized by representations invariant to time shifts, spatial shifts, frequency shifts, and scale changes as the situation dictates. Advances in time-frequency analysis and scale transform techniques have made this possible. The next step is to distinguish between invariant forms representing different classes of image or signal. Unfortunately, additional factors such as noise contamination and `style' differences complicate this. A ready example is found in text, where letters and words may vary in size and position within the image segment being examined. Examples of complicating variations include font used, corruption during fax transmission, and printer characteristics. The solution advanced in this paper is to cast the desired invariants into separate subspaces for each extraneous factor or group of factors. The first goal is to have minimal overlap between these subspaces and the second goal is to be able to identify each subspace accurately. Concepts borrowed from high-resolution spectral analysis, but adapted uniquely to this problem have been found to be useful in this context. Once the pertinent subspace is identified, the recognition of a particular invariant form within this subspace is relatively simple using well-known singular value decomposition techniques.

关键词： scale transform Mellin transform wordspotting singular value decomposition character recognition time-frequency

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Parallel and fault -tolerant techniques for adaptive matched -field processing (MFP) on distributed array systems

Parallel and fault -tolerant techniques for adaptive matched...

引用

作者： Cho, Kil Seok University of Florida

学位级别：Ph.D.

Sonar array systems in the highly cluttered undersea environment require new and enhanced signal-processing algorithms and sophisticated architectures to meet the stringent real-time and reliability mission requirements. These demands present significant challenges in terms of computational complexity and dependability; and necessitate the development and use of high-performance computing techniques and advanced signal-processing algorithms. Our study introduces novel parallel and fault-tolerant techniques for adaptive matched-field processing (MFP) which we investigated on distributed array systems along with high-performance networking and distributed computing architectures. We developed the parallel algorithms for adaptive MFP to satisfy the computational and memory requirements not readily supported by cutting-edge, high-performance, single-processor systems. We proposed robust MFP algorithms to compensate for the performance degradation presented by sensor failures in sonar array systems. We also developed fault-tolerant parallel algorithms characterized by low overhead and fast recovery time to enhance dependability. We implemented the proposed parallel algorithms and fault-tolerant mechanisms on scalable clusters of computers. We compared their performance considering several critical factors such as parallel and fault-tolerant techniques, communication schemes, and processor architectures. Results show that these parallel and fault-tolerant algorithms can provide a feasible solution for real-time, scalable, and highly reliable beamforming implementations on distributed array systems.

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PARALLEL AND ADAPTIVE HIGH-RESOLUTION DIRECTION FINDING

PARALLEL AND ADAPTIVE HIGH-RESOLUTION DIRECTION FINDING

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

作者： VANPOUCKE, F MOONEN, M DEPRETTERE, E Katholieke Univ. Leuven (Belgium) Delft Univ. of Technology (Netherlands)

ISBN: (纸本)081940943X

The direction-of-arrival (DOA) estimation problem consists in determining the angles of arrival of a number of signals impinging on a sensor array. Recently, the so-called ESPRIT method of Roy and Paulraj has received a great deal of attention in the literature. The method employs matrix decomposition techniques, such as singular value decomposition (SVD) and generalized Schur decomposition (GSD). The computational complexity thus involved represents a serious impediment, especially when a real-time implementation is aimed for. Therefore, the aim here is to develop an ESPRIT-type algorithm which is fully adaptive and amenable to parallel implementation. By introducing adaptivity, the computational complexity per sampling period is reduced from (Omicron) (m³) to (Omicron) (m²), where m is the `problem size,' i.e., the number of antenna doublets. On a parallel processor array with (Omicron) (m²) processors, the throughput is then (Omicron) (m^o), which means that the number of measurements that are processed per time unit is independent of the problem size. The algorithm is based on an adaptive SVD updating algorithm, combined with an adaptive GSD. The corresponding systolic implementation is based on the systolic SVD updating array of Moonen et al.

关键词： Matrices Sensors Algorithm development Interference (communication) Array processing Antennas Data processing Parallel computing Electrical engineering Phase shifts

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Optimizing time-frequency distributions for automatic classification

Optimizing time-frequency distributions for automatic classi...

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

作者： Atlas, L Droppo, J McLaughlin, J Univ. of Washington (United States) MIT Lincoln Lab. (United States)

ISBN: (纸本)0819425842

An entirely new set of criteria for the design of kernels (generating functions) for time-frequency representations (TFRs) is presented. These criteria aim only to produce kernels (and thus, TFRs) which will enable more accurate classification. We refer to these kernels, which are optimized to discriminate among several classes of signals, as signal class dependent kernels, or simply class dependent kernels. The genesis of the class dependent kernel is to be found in the area of operator theory, which we use to establish a direct link between a discrete-time, discrete-frequency TFR and its corresponding discrete signal. We see that many similarities, but also some important differences, exist between the results of the continuous-time operator approach and our discrete one. The differences between the continuous representations and discrete ones may not be the simple sampling relationship which has often been assumed. From this work, we obtain a very concise, matrix-based expression for a discrete-time/discrete-frequency TFR which is simply the product of the kernel with another matrix. This simple expression opens up the possibility to optimize the kernel in a number of ways. We focus, of course, on optimizations most suitable for classification, and ultimately wind up with the class dependent kernel. When applied to simulated sonar transient signals, we find that our approach does a good job of discriminating within very similar classes of transients and is especially sensitive to differences in time variation across classes.

关键词： Time-frequency analysis Matrices Fourier transforms Convolution Detection theory Distance measurement signal generators signal processing Silicon Stochastic processes

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Fast algorithms for Cauchy-Vandermonde matrices with multiple poles

Fast algorithms for Cauchy-Vandermonde matrices with multipl...

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Martinez, J.J. Pena, J.M. Universidad de Alcala Madrid Spain

Cauchy-Vandermonde matrices are related with rational interpolation problems. In this paper we consider the general case in which multiple poles can appear. Fast algorithms for solving the corresponding linear systems... 详细信息

关键词： signal processing

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Approach to the joint optimization of video communications and video signal processing

Approach to the joint optimization of video communications a...

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

作者： Pearlman, WA Medley, MJ Suter, BW Rensselaer Polytech Inst Ctr Next Generat Video Res Troy NY 12180 USA

ISBN: (纸本)0819441880

Compressed video bitstreams require protection from channel errors in a wireless channel. The three-dimensional (3-D) SPIHT coder has proved its efficiency and its real-time capability in compression of video. A forward-error-correcting (FEC) channel (RCPC) code combined with a single ARQ (automatic-repeat-request) proved to be an effective means for protecting the bitstream. In this paper, the need for ARQ is eliminated by making the 3-D SPIHT bitstream more robust and resistant to channel errors. Packetization of the bitstream and the reorganization of these packets to achieve scalability in bit rate and/or resolution in addition to robustness is demonstrated and combined with channel coding to not only protect the integrity of the packets, but also allow detection of packet decoding failures, so that only the cleanly recovered packets are reconstructed. In extensive comparative tests, the reconstructed video is shown to be superior to that of MPEG-2, with the margin of superiority growing substantially as the channel becomes noisier.

关键词： video compression video transmission robust source coding error resilient transmission combined source-channel coding 3-D wavelet transform embedded wavelet coding

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Low Power implementation of a Turbo-decoder on programmable architectures

Low Power implementation of a Turbo-decoder on programmable ...

引用

Asia and South Pacific Design Automation Conference (ASP-DAC 2001)

作者： Gilbert, F Worm, A Wehn, N Univ Kaiserslautern Dept Elect Engn & Informat Technol Inst Microelect Syst D-67663 Kaiserslautern Germany

ISBN: (纸本)0780366336

Low Power is an extremely important issue for future mobile radio systems. Channel decoders are essential building blocks of base-band signal processing units in mobile terminal architectures. Thus low power implementations of advanced channel decoding techniques are mandatory. In this paper we present a low power implementation of the most sophisticated channel decoding algorithm (Turbo-decoding) on programmable architectures. Low power optimization is performed on two abstraction levels: on system level by the use of an intelligent cancellation technique, on implementation level by the use of dynamic voltage scaling. With these techniques we can reduce the worst case energy consumption to 55% using data of state-of-the-art processors. Our approach is also applicable for hardware implementations. To the best of our knowledge, this is the first in-depth study of low power implementations of Turbo-decoders based on voltage scheduling for third generation wireless systems.

关键词： Bit error rate Channel coding Dynamic voltage scaling Error correction Forward error correction Iterative decoding Processor scheduling Redundancy signal processing algorithms Turbo codes

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Development of transient power quality indices based on time-frequency distribution

Development of transient power quality indices based on time...

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advanced signal processing algorithms, architectures, and implementations XV

作者： Shin, Yong-June Crapse, Philip Department of Electrical Engineering University of South Carolina Columbia SC 29208 United States

For an assessment of the power quality in power distribution systems, classical Fourier series-based power quality indices are normally employed. The classical Fourier series-based power quality indices assume the periodicity of the disturbance so that the applications are limited to the harmonics. Hence, it is necessary for us to redefine power quality indices for the "transient" disturbances. In this paper, development of time-frequency based power quality indices are discussed for an assessment of transient power quality. The time and frequency localized information of the transient disturbance signals will be utilized for a new definition of the transient power quality indices. As an example of time-frequency based power quality indices, new definition of transient telephone interference factor has been carefully derived and verified in comparison with traditional telephone interference factor has been carefully derived and verified in comparison with traditional telephone interference factor. Time-frequency based power quality indices allow one to quantify the effects of transient disturbances by time and frequency localized information.

关键词： signal processing

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