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检索条件"主题词=Filtering algorithms"

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Application of Polynomial filtering algorithms to Nonlinear Discrete Dynamical Systems in Navigation Data Processing

Application of Polynomial Filtering Algorithms to Nonlinear ...

引用

European Control Conference (ECC)

作者： Oleg A. Stepanov Vladimir A. Vasiliev Mihail V. Basin Viktor A. Tupysev Yulia A. Litvinenko Concern CSRI Elektropribor JSC ITMO University Saint Petersburg Russia JSC Concern CSRI Elektropribor Saint Petersburg Russia Department of Physical and Mathematical Sciences Autonomous University of Nuevo Leon San Nicolas de los Garza Mexico Concern CSRI Elektropribor JSC State University of Aerospace Instrumentation Saint Petersburg Russia Concern CSRI Elektropribor ITMO University JSC Saint Petersburg Russia

ISBN: (数字)9783907144022

ISBN: (纸本)9781728188133

A polynomial filtering algorithm is designed for estimating a Markov sequence with the use of linear measurements. The feature of the estimation problem is that the Markov sequence is described by a nonlinear shaping filter, which is a second-order polynomial with respect to the state vector components. The efficiency of the proposed algorithm is analyzed in comparison with the nonlinear optimal algorithm and an extended Kalman filter, when solving the problem of gyroscope drift model identification.

关键词： Heuristic algorithms Mathematical model Navigation Estimation Covariance matrices Electronic mail filtering algorithms

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Backprojection filtering algorithms for reconstruction of vector and second order tensor fields

Backprojection filtering algorithms for reconstruction of ve...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： G.T. Gullberg M. Defrise V.Y. Panin G.L. Zeng University of Utah Salt Lake UT USA AZ-VUB University Hospital Brussels Belgium

Tensor tomography is being investigated as a technique for reconstruction of in vivo tensor fields which will enable development of more accurate models of the properties of biological tissue. This paper presents backprojection filtering algorithms for reconstructing three-dimensional vector and second order tensor fields with the property of being independent of the coordinate z. The backprojection of a complete set of directional projection measurements gives straightforward results that are fairly simple extensions of the usual scalar reconstruction methods. Both vector fields and tensor fields are represented as a sum of solenoidal and irrotational components. The irrotational component of the vector field can be reconstructed from a single set of directional measurements. The reconstruction of the solenoidal and irrotational components for a tensor field each require six directional projection measurements. Results of computer simulations that demonstrate the validity of the mathematical formulations are presented. A simulated cardiac diffusion tensor field shows that the principal component of the tensor field could be specified utilizing half of the number of MRI measurements that are presently being utilized.

关键词： filtering algorithms Tensile stress Tomography In vivo Biological system modeling Biological tissues Reconstruction algorithms Computer simulation Computational modeling Magnetic resonance imaging

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Necessary and sufficient conditions and robustness for convergence of adaptive filtering algorithms

Necessary and sufficient conditions and robustness for conve...

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IEEE Conference on Decision and Control

作者： Yunmin Zhu Aijun Gao Institute of Mathematical Sciences Academia Sinica China

ISBN: (纸本)0780304500

The necessary and sufficient conditions for the almost sure convergence of adaptive filtering algorithms based on (a/n) stepsize are established. Assuming that the covariance of the output signal (Y/sub n/) and the cross-covariance of (Y/sub n/) and the reference signal ( psi /sub n/) are constant, if (Y/sub n/ Y/sub n/') satisfies a law of large numbers (where ' denotes transpose), then the necessary and sufficient condition for almost sure convergence of adaptive filtering algorithms is that (Y/sub n/ psi /sub n/') also satisfies the law of large numbers. Moreover when there exists a small deviation from the law of large numbers for (Y/sub n/ Y/sub n/') and (Y/sub n/ psi /sub n/'), there is also a bounded deviation dependent on the former from the convergence of the algorithms, and the latter tends to zero as the former goes to zero.< >

关键词： Sufficient conditions Robustness Convergence Adaptive filters filtering algorithms Signal processing Erbium Algorithm design and analysis Stochastic processes

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Implementation and performance of composite fast FIR filtering algorithms

Implementation and performance of composite fast FIR filteri...

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Workshop on VLSI Signal Processing

作者： A. Zergainoh P. Duhamel INT SIM TNS France ENSTSIG Paris France

This paper provides a technique to derive a new set of fast Finite Impulse Response (FIR) filtering algorithms founded on the combination of filtering algorithms based on short FFT and short length fast FIR filtering algorithms. Such composite algorithms have the potential to reduce the arithmetic complexity and the characteristic to maintain a low processing delay, independent of the filter length. A methodology for an efficient implementation on the Digital Signal Processor (DSP) of these algorithms is proposed by an optimised structuring and organization of data in memory in order to keep the improvement brought by the reduction of the arithmetic complexity without exceeding the DSP resources such as number of pointers registers and memory. The performance is evaluated in number of machine cycles per point computed. The solution exists to complete the generator code built for the basic algorithms by adding macro-instructions written in a "DSP" assembly code.

关键词： Finite impulse response filter filtering algorithms Signal processing algorithms Digital signal processing Delay Digital signal processors Optimization methods Digital arithmetic Registers Assembly

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A unified derivation of square-root multichannel least-squares filtering algorithms

A unified derivation of square-root multichannel least-squar...

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1993 IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： B.H. Khalaj A.H. Sayed T. Kailath Information Systems Laboratory University of Stanford Stanford CA USA

The authors present a new derivation of exact least-squares multichannel and multidimensional adaptive algorithms, based on explicitly formulating the problem as a state-space estimation problem and then using different square-root versions of the Kalman, Chandrasekhar, and information algorithms. The amount of data to be processed here is usually significantly higher than in the single-channel case, and reducing the computational complexity of the standard multichannel RLS (recursive least square) algorithm is thus of major importance. This reduction is usually achieved by invoking the existing shift structure in the input data. For this purpose, it is shown how to apply the extended Chandrasekhar recursions, with an appropriate choice of the initial covariance matrix, to reduce the computations by an order of magnitude. In multichannel filters, the number of weights in different channels is not necessarily the same. This is illustrated with two examples: a nonlinear Volterra-series filter and a two-dimensional filter. In the former case the number of weights varies among the channels, but in the latter case all channels have the same number of weights.< >

关键词： filtering algorithms Resonance light scattering Adaptive filters Vectors Virtual colonoscopy Lattices Signal processing Least squares methods IIR filters Nonlinear filters

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An efficient implementation of digital filtering algorithms using a multiprocessor system

An efficient implementation of digital filtering algorithms ...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Wonyong Sung S.K. Mitra B. Jeren Seoul National University Seoul South Korea University of California Santa Barbara CA USA University of Zagreb Zagreb Yugoslavia

An efficient real-time implementation of digital filtering algorithms using a multiprocessor system in a ring network is investigated. This method is based on a parallel block processing approach, where a continuous supply of input data is divided into blocks and a block is assigned to each processor in rotation. The system is easily expandable and shows a high efficiency even in a large-scale multiprocessing environment. Methods for solving the dependency problems between the processors are also investigated to increase the number of processors which can be used efficiently. Implementation procedures and results for finite impulse response (FIR), recursive, and adaptive filtering algorithms are illustrated. This method has been successfully tested on the SABRINA (Santa Barbara ring network architecture) multiprocessor system developed at the University of California, Santa Barbara, and some experimental results are included.< >

关键词： filtering algorithms Multiprocessing systems Signal processing Processor scheduling Finite impulse response filter Signal processing algorithms Real time systems Digital filters Large-scale systems Adaptive filters

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Multiparameter optimization of inverse filtering algorithms

Multiparameter optimization of inverse filtering algorithms

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IEEE Instrumentation and Measurement Technology Conference

作者： T. Daboczi I. Kollar Information Systems Laboratory Department of Electrical Engineering University of Stanford Stanford CA USA

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A family of variable step-size affine projection adaptive filtering algorithms with selevtive partial update

A family of variable step-size affine projection adaptive fi...

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Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Shams Esfand Abadi Vahid Mehrdad Department of Electrical Engineering Shahid Rajaee University Tehran Iran

ISBN: (纸本)9781424467600

This paper presents a family variable step-size (VSS) affine projection (AP) adaptive filtering algorithms with selective partial updates (SPU). The presented algorithms have good convergence speed, low steady state mean square error (MSE), and low computational complexity features. We demonstrate the good performance of the proposed algorithms through simulations in system identification and acoustic echo cancellation scenarios.

关键词： Adaptive filters filtering algorithms Variable structure systems Convergence Steady-state Mean square error methods Computational complexity Computational modeling System identification Echo cancellers

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The use of FIR and IIR adaptive filtering algorithms in the active control of acoustic noise

The use of FIR and IIR adaptive filtering algorithms in the ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： S.J. Flockton Royal Holloway and Bedford New College University of London Egham Surrey UK

The role of gradient-based FIR (finite impulse response) and IIR (infinite impulse response) adaptive algorithms as candidates for adapting an active controller for acoustic noise where there is acoustic feedback from secondary source to detector is examined. It is shown that the use of the common algorithms without modification is equivalent to making some fairly sweeping approximations. Nevertheless, simulations show that such systems may work well, though not necessarily achieving the maximum attenuation available.< >

关键词： Finite impulse response filter Adaptive filters filtering algorithms IIR filters Adaptive algorithm Acoustic noise Feedback Acoustic signal detection Detectors Attenuation

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Comparison of Synchronous Detection and I. Cosϕ Shunt Active filtering algorithms

Comparison of Synchronous Detection and I. Cosϕ Shunt Activ...

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International Conference on Power Electronic Drives and Energy Systems for Industrial Growth

作者： G. Bhuvaneswari Manjula G. Nair Sathish Kumar Reddy Department of Electrical Engineering Indian Institute of Technology New Delhi India

In this paper, two shunt active filtering algorithms, namely, synchronous detection technique and newly proposed ***ϕ algorithm have been simulated and implemented in hardware and a comparison has been brought out. The proposed algorithm is found to work satisfactorily under various system operating conditions. The hardware implementation of both the schemes have been done and the proposed scheme is found to be simple and working satisfactorily.

关键词： filtering algorithms Active filters Hardware Power generation Voltage control Reactive power Variable speed drives Uninterruptible power systems Power quality Signal generators

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