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检索条件"主题词=Projection Algorithms"

共 820 条记录，以下是111-120 订阅

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Effective Sparse Array Synthesis Using a Generalized Alternate projection Algorithm

Effective Sparse Array Synthesis Using a Generalized Alterna...

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IEEE Conference on Antenna Measurements and Applications (CAMA)

作者： Pinchera, Daniele Migliore, Marco Donald Univ Cassino & Southern Lazio DIEI Cassino FR Italy

ISBN: (纸本)9781479936786

A simple and fast deterministic approach for sparse array synthesis is proposed. The algorithm employs a modified generalized alternate projection algorithm using 1-norm minimization in order to achieve the excitation and the position of the elements of a sparse array. Some preliminary results presented show the promising performances of the introduced method.

关键词： antenna radiation patterns linear antenna arrays minimisation 1-norm minimization effective sparse linear array synthesis modified generalized alternate projection algorithm sparse array element excitation sparse array element position Algorithm design and analysis Arrays Compressed sensing MIMICs Optimization projection algorithms Vectors projection algorithms Algorithm design and analysis linear antenna arrays Millimeter wave monolithic integrated circuits antenna radiation patterns Compressed sensing arrays Mimicry

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Parallel Processing of the Fast Decimation-in-image Back-projection Algorithm for SAR 4

Parallel Processing of the Fast Decimation-in-image Back-pro...

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4th Conference of the Sensor Signal Processing for Defence (SSPD)

作者： Kelly, Shaun I. Davies, Mike E. Thompson, John Univ Edinburgh Inst Digital Commun Edinburgh EH8 9YL Midlothian Scotland

ISBN: (纸本)9781479952939;9781479952946

Fast back-projection algorithms provide substantial speedup when compared with the standard back-projection algorithm. However in many potential near-field applications of synthetic aperture radar, further speedup is still required in order to make the application operationally feasible. In this paper we investigate the application of multi-core central processing units and graphic processing units, which are now standard on most scientific workstations, to further speed up a very recently proposed fast back-projection algorithm (the fast decimation-inimage back-projection algorithm).

关键词： Approximation algorithms Approximation methods Graphics processing units Image segmentation Multicore processing Standards Synthetic aperture radar projection algorithms Synthetic aperture radar Approximation method Approximation algorithms image segmentation Graphics Processing Unit Fasting PARALLEL PROCESSING (COMPUTERS) Speeding

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Adaptive Feedback Control using Improved Variable Step-Size Affine projection Algorithm for Hearing Aids 9

Adaptive Feedback Control using Improved Variable Step-Size ...

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9th Annual Summit and Conference of the Asia-Pacific-Signal-and-Information-Processing-Association (APSIPA ASC)

作者： Tran, Linh T. T. Schepker, Henning Doclo, Simon Dam, Hai H. Nordholm, Sven E. Curtin Univ Fac Sci & Engn Perth WA Australia Carl von Ossietzky Univ Oldenburg Dept Med Phys & Acoust Signal Proc Grp Oldenburg Germany Carl von Ossietzky Univ Oldenburg Cluster Excellence Hearing4All Oldenburg Germany

ISBN: (纸本)9781538615423

The affine projection algorithm (APA) is commonly used for adaptive filtering in acoustic echo cancellation (AEC) due to its higher convergence and tracking rate compared to the conventional normalized least mean squares (NLMS) algorithm, especially for spectrally colored incoming signals. However, its application to adaptive feedback control (AFC) in hearing aids (HAs) is still not common because of the inherent correlation between the loudspeaker and incoming signals as well as the increase in computational complexity. In this paper, we investigate a way to employ a low projection order APA in conjunction with an improved practical variable step-size (IPVSS) for the prediction error method (PEM) based adaptive feedback control in HAs. The proposed approach is evaluated for a speech incoming signal and for a sudden change of the acoustic feedback path. The experimental results show that the proposed approach yields much better performance than a system employing either the upper or the lower fixed step-size used in the IPVSS as well as the PEM using the IPVSS for the NLMS algorithm (PEM-IPVSS-NLMS). By choosing a small projection order for the APA there is only a slight increase in the computational complexity. Moreover, a small amount of frequency shifting (FS) is integrated to further improve the system's performance.

关键词： Acoustics Convergence Loudspeakers Microphones projection algorithms Correlation Speech

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An Improved Affine projection Algorithm and Its Application in Echo Cancellation 3

An Improved Affine Projection Algorithm and Its Application ...

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2017 IEEE 第3届信息技术与机电一体化工程国际学术会议(ITOEC 2017)

作者： Yang Yanyan Zhang Linghua College of Telecommunications & Information Engineering Nanjing University of Posts and Telecommunications

Based on the variable step-size affine projection algorithm,the idea of multiple forgetting factors and variable projection order is *** the one hand,the accurate estimation of error energy is

ISBN: (纸本)9781509053643;9781509053636

Based on the variable step-size affine projection algorithm,the idea of multiple forgetting factors and variable projection order is *** the one hand,the accurate estimation of error energy is

关键词： Convergence projection algorithms Signal processing algorithms Computational complexity Adaptive filters Echo cancellers Telecommunications

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Adaptive Reduced-Rank Affine projection Algorithm based on Joint Optimisation 14

Adaptive Reduced-Rank Affine Projection Algorithm based on J...

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2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)

作者： Sitjongsataporn, Suchada Mahanakorn Univ Technol Fac Engn Dept Elect Engn 140 Cheumsamphan Rd Bangkok 10530 Thailand

ISBN: (纸本)9781538604496

In this paper, an adaptive reduced-rank filtering approach based on joint optimisation of adaptive filtering is proposed for the design of the projection matrix of reduced-rank filter and adaptive affine projection algorithm. We introduce how to derive an adaptive reduced-rank affine projection algorithm with the method of joint optimisation and Lagrangian criteria. Simulation results show that the proposed algorithm can accomplish both fast convergence and good tracking compared with the conventional affine projection algorithm.

关键词： projection algorithms Convergence Signal processing algorithms Telecommunications Information technology Cost function

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Back projection Algorithm for Line Structured Light Extraction

Back Projection Algorithm for Line Structured Light Extracti...

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MTS/IEEE Oceans Conference

作者： Duda, Alexander Albiez, Jan German Res Ctr Artificial Intelligence Bremen Germany

ISBN: (纸本)9780933957404

Structure from motion and structure from light are usually regarded separately. To combine both methods, using the same images to retrieve three dimensional information about the environment, both methods must work side by side without interfering each other. This research work describes how laser line patterns can be extracted from images while being robust to scattering media and ambient light.

关键词： backprojection structured light Line projection algorithms ambient light Research work images LINE PATTERN

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AN EFFICIENT DATA-REUSING KERNEL ADAPTIVE FILTERING ALGORITHM BASED ON PARALLEL HYPERSLAB projection ALONG AFFINE SUBSPACES

AN EFFICIENT DATA-REUSING KERNEL ADAPTIVE FILTERING ALGORITH...

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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Takizawa, Masa-aki Yukawa, Masahiro Niigata Univ Dept Elect & Elect Engn Niigata 95021 Japan

ISBN: (纸本)9781479903566

We propose a novel kernel adaptive filtering algorithm, dubbed Parallel HYperslab projection along Affine SubSpaces (Phi-PASS), which reuses observed data efficiently. We first derive its fully-updating version that projects the current filter onto multiple hyperslabs in parallel along the dictionary subspace. Each hyperslab accommodates one of the data observed up to the present time instant. The algorithm is derived with the adaptive projected subgradient method (APSM) based on which a convergence analysis is presented. We then generalize the algorithm so that only a few coefficients, whose associated dictionary-data are coherent to the datum of each hyperslab, can be updated selectively for low complexity. This is accomplished by performing the hyperslab projections along affine subspaces defined with the selected dictionary-data. Numerical examples show the efficacy of the proposed algorithm.

关键词： kernel adaptive filter projection algorithms reproducing kernel Hilbert space the HYPASS algorithm

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Multichannel Fast Affine projection Algorithm with Gradient Adaptive Step-Size and Fast Computation of Adaptive Filter Output Signal 12

Multichannel Fast Affine Projection Algorithm with Gradient ...

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Proceedings of IEEE East West Design and Test Symposium ( EWDTS 2014)

作者： Djigan, Victor I. Huawei Technol Co Ltd Russian Res Ctr Beta Ctr Altufyevskoye Shosse 1A Moscow 127106 Russia

ISBN: (纸本)9781479976300

The paper presents a computational procedure of a multichannel Fast Affine projection algorithm. The procedure also includes Sliding Window linear prediction, Gradient Adaptive Step-Size and fast computation of adaptive filter output signal. An example of the algorithm application in a combined Feed-Forward and Feed Backward Active Noise Control system, which can be viewed as a two-channel adaptive filter, and simulation results are discussed.

关键词： adaptive filters affine transforms gradient methods adaptive filter output signal computational procedure feedbackward active noise control system feedforward active noise control system gradient adaptive step size multichannel fast affine projection algorithm sliding window linear prediction Adaptive filters Algorithm design and analysis Complexity theory Microphones Noise Prediction algorithms Vectors adaptive filters computational procedure Affine transformation Algorithm design and analysis Prediction algorithms Microphone Device Component Complexity theory gradient methods Noise projection algorithms step size outgoing signal

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SOLVING THE HYPERSPECTRAL UNMIXING PROBLEM WITH projection ONTO CONVEX SETS

SOLVING THE HYPERSPECTRAL UNMIXING PROBLEM WITH PROJECTION O...

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21st European Signal Processing Conference (EUSIPCO)

作者： Heylen, Rob Akhter, Muhammad Awais Scheunders, Paul Univ Antwerp IMinds Visionlab B-2610 Antwerp Belgium

ISBN: (纸本)9781479936878

An important problem in hyperspectral unmixing is solving the inversion problem, which determines the abundances of each endmember in each pixel, taking the constraints on these abundances into account. In this paper, we present a new geometrical method for solving this inversion problem, based on the equivalence with the simplex projection problem, and projection onto convex sets. By writing the simplex as an intersection of a plane and convex halfspaces, an alternating projection algorithm is constructed based on the Dykstra algorithm. We show that the resulting algorithm can be used to successfully solve the spectral unmixing problem, and yields results that are comparable to those obtained with state-of-the-art methods. The runtime required is very competitive, and the very simple nature of the algorithm allows for highly efficient implementations.

关键词： Convexity exsolution projection projection algorithms projection Simplex SETTING pixel Surjective

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New structure of affine projection algorithm using a novel subband adaptive system 3

New structure of affine projection algorithm using a novel s...

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3rd IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC 01)

作者： Nishikawa, K Kiya, H Tokyo Metropolitan Univ Dept Elect Engn Tokyo 1920397 Japan

ISBN: (纸本)0780367200

This paper proposes a new structure of the affine projection algorithm (APA) based on the subband adaptive system (SAS). It is known that the APA can increase the rate of convergence when the input signal is highly correlated. The SAS used in the proposed structure differs from the conventional ones, i.e., It does not include the decimation operations, the adaptive filters in subbands share the same coefficients, and coefficients of analysis filters are determined according to the Hadamard transform. These differences make the proposed structure to have some advantages over the conventional structures of the APA, e.g., we can greatly reduce the computational requirement for implementing the APA because the proposed structure does not require the matrix inversion.

关键词： Adaptive filters Adaptive systems Computational complexity Convergence Decorrelation Equations Instruments Least squares approximation projection algorithms Synthetic aperture sonar

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