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检索条件"任意字段=4th IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 931 条记录，以下是401-410 订阅

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Deterministic blind identification in antenna array processing

Deterministic blind identification in antenna array processi...

引用

sensor array and multichannel signal processing workshop

作者： Souleymen Sahnoun Pierre Comon GIPSA-Lab CNRS UMR5216 France

the estimation of directions of arrival is formulated as the decomposition of a 3-way array into a sum of rank-one terms. However, a low-rank tensor approximation does not always exist. We propose an optimization technique based on differentiable angular constraints on the factors, ensuring the existence of the low-rank tensor decomposition. the efficiency of the proposed algorithm is demonstrated via numerical simulations, and compared to Cramér-Rao bounds.

关键词： arrays signal processing algorithms Estimation Direction-of-arrival estimation Tensile stress Vectors

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BEAMSPACE ADAPTIVE BEAMFORMING BASED ON PRINCIPLE COMPONENT ANALYSIS

BEAMSPACE ADAPTIVE BEAMFORMING BASED ON PRINCIPLE COMPONENT ...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Lei Yu Wei Liu Richard Langley Communications Research Group Department of Electronic and Electrical Engineering University of Sheffield UK

A novel adaptive beamforming method is proposed without the knowledge of the direction of arrival of the signal of interest. It is a combination of the traditional beamspace processing method and a recently proposed technique called "Domain Weighted Principal Component Analysis (DW-PCA)" and can be applied to the case where the signal of interest is stronger than the interfering signals in both single-path and multi-path environments. Its effectiveness is verified by simulation results.

关键词： Adaptive systems array signal processing Multipath channels

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POWER-AWARE DISTRIBUTED DETECTION IN IR-UWB sensor NETWORKS

POWER-AWARE DISTRIBUTED DETECTION IN IR-UWB SENSOR NETWORKS

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Daniel Bielefeld Gernot Fabeck Rudolf Mathar Institute of Theoretical Information Technology RWTH Aachen University Aachen Germany

the interplay between signal processing and wireless networking plays a crucial role in sensor networks deployed for detection and estimation applications. In this paper, an opportunistic power assignment strategy for IR-UWB sensor networks is presented which is designed to optimize detection performance in terms of the global probability of error. the opportunistic power assignment strategy utilizes both the detection error probabilities of individual sensors as well as network topology information, leading to significant performance gains compared to uniform power assignment.

关键词： Interference signal to noise ratio Wireless sensor networks Wireless communication Noise Transceivers Upper bound

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Minimax robust phased array for wireless communications 4

Minimax robust phased array for wireless communications

引用

4th ieee workshop on signal processing Advances in Wireless Communications, SPAWC 2003

作者： Katkovnik, Vladimir Lee, Moon-Sik Kim, Yong-Hoon 1 Oryong-dong Buk-gu Gwangju500-712 Korea Republic of

ISBN: (纸本)078037858X

In many physical communication systems, the channel noise is known through experimental measurements to be non-Gaussian with an essential impulsive phenomena. the performance of standard signal estimators degrades substantially in the presence of such impulsive ambient noise. In this paper, new robust M-estimation techniques are developed for combating impulsive noise and interferences in communication systems. Power functions of the proposed robust estimators are obtained by minimizing a nonquadratic residual function derived from the Huber's minimax robust estimation theory. Maximum peaks of the power functions are used for estimation of communication signals as well as direction-of-arrival (DOA). Simulation shows that the proposed robust techniques, the robust median and robust Huber estimators, offer significant performance gain over the conventional estimator, with the best results given by the robust Huber estimator. © 2003 ieee.

关键词： Impulse noise

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EFFICIENT DESIGN OF FREQUENCY INVARIANT BEAMFORMERS WIth sensor DELAY-LINES

EFFICIENT DESIGN OF FREQUENCY INVARIANT BEAMFORMERS WITH SEN...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Yong Zhao Wei Liu Richard J. Langley Communications Research Group Department of Electronic and Electrical Engineering University of Sheffield UK

the design of frequency invariant beamformers for traditional tapped delay-line array system can be formulated as a convex optimization problem and solved efficiently using the interior-point methods. this approach is extended to the recently proposed broadband beamforming system with sensor delay-lines and some variations are proposed to cope with the specific requirements in the design. Design examples are provided to show the effectiveness of the proposed method.

关键词： Frequency invariant beamformer sensor delay-line Convex optimization

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FPGA design and implementation of fixed width standard and truncated 6x6-bit multipliers: A comparative study

FPGA design and implementation of fixed width standard and t...

引用

2009 4th International Design and Test workshop, IDT 2009

作者： Rais, Muhammad H. Electrical Engineering Department College of Engineering King Saud University Riyadh 11421 Saudi Arabia

ISBN: (纸本)9781424457489

this paper presents a comparative study of Field Programmable Gate array (FPGA) implementation of standard and truncated multipliers using Very High Speed Integrated Circuit Hardware Description Language (VHDL). Truncated multiplier is a good candidate for digital signal processing (DSP) applications such as finite impulse response (FIR) and discrete cosine transform (DCT) etc. Significant reduction in FPGA resources, delay, and power can be achieved using truncated multipliers instead of standard parallel multipliers when the full precision of the standard multiplier is not required. the power and area of truncated 6x6-bit multiplier shows significant improvement as compared to standard 6x6-bit multiplier. For Xilinx Spartan-3AN (XC3S700ANFGG484-5) FPGA device, truncated multiplier shows a reduction in power and area by 45% and 67% respectively as compared to standard multiplier. ©2009 ieee.

关键词： Digital signal processing

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Sparse Bayesian Learning for DOA Estimation of Correlated Sources

Sparse Bayesian Learning for DOA Estimation of Correlated So...

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sensor array and multichannel signal processing workshop

作者： Christoph F. Mecklenbriiuker Peter Gerstoft Geert Leus Inst. of Telecommunications Wien Austria University of California San Diego Dept. of Electrical Eng. Delft Univ. of Technology

Direction of arrival (DOA) estimation from array observations in a noisy environment is discussed. the source amplitudes are assumed to be correlated zero-mean complex Gaussian distributed with unknown covariance matrix. the DOAs and covariance parameters of plane waves are estimated from multi-snapshot sensor array data using sparse Bayesian learning (SBL). the performance of SBL is evaluated in terms of the fidelity of the reconstructed coherency matrix of the estimated plane waves.

关键词： Covariance matrices Direction-of-arrival estimation sensor arrays Estimation array signal processing signal processing algorithms

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Local and global calibration for high-resolution doa estimation in automotive radar

Local and global calibration for high-resolution doa estimat...

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sensor array and multichannel signal processing workshop

作者： Michael Schoor Bin Yang Chair of System Theory and Signal Processing Universität Stuttgart Germany

Calibration of an antenna array is very important for high-resolution direction-of-arrival (DOA) estimation. In this paper, we study this issue for an automotive frequency modulated continuous wave (FMCW) radar whose low-cost dielectric lens antenna causes, in addition to the coupling between sensor elements and gain or phase mismatch, direction-dependent perturbations to the sensor response. We apply both global and local calibration methods and compare their performance.

关键词： Calibration Direction of arrival estimation Estimation Radar Radar antennas arrays Automotive engineering

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Nonsmooth Optimization-Based Beamforming in Multiuser Wireless Relay Networks

Nonsmooth Optimization-Based Beamforming in Multiuser Wirele...

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4th International Conference on signal processing and Communication Systems (ICSPCS)/12th International Symposium on DSP and Communication Systems (DSPCS)/9th workshop on the Internet, Telecommunications and signal processing (WTSP)

作者： Phan, A. H. Tuan, H. D. Kha, H. H. Nguyen, Ha H. Univ New S Wales Sch Elect Engn & Telecommun Unsw Sydney NSW 2052 Australia Univ Saskatchewan Dept Elect & Comp Engn Saskatoon S7N 5A9 SK Canada

ISBN: (纸本)9781424479078

the amplify-and-forward (AF) relay beamforming problems are naturally formulated as indefinite quadratic (nonconvex) optimization programs. the typical methods for solving such optimization problems are to transform them into convex semi-definite programs (SDPs) with additional rank-one (nonconvex and discontinuous) constraints. the rank-one constraints are then dropped to obtain solvable SDP relaxed problems and randomization techniques are employed for seeking the feasible solutions to the original nonconvex optimization problems. In many conventional scenarios, the results from solving the rank-one relaxed SDP problems are enough to conclude the solutions since no rank-higher-than-one SDP resulting matrix can be observed. through our simulations, we found that there are also many scenarios that the SDP solvers give high-rank solutions. Hence, in this paper the rank-one constraints are equivalently expressed as reverse convex constraints and are incorporated into the optimization problems. then, we propose an efficient iterative algorithm for solving the nonsmooth reverse convex optimization problems. Our simulations show that our proposed approach yields nearly global optimal solutions.

关键词： amplify and forward communication amplify-and-forward relay beamforming array signal processing indefinite quadratic optimization programs iterative algorithm iterative methods multiuser wireless relay networks nonsmooth optimization-based beamforming qua

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A novel interpretation of Capon’s method in beam space

A novel interpretation of Capon’s method in beam space

引用

sensor array and multichannel signal processing workshop

作者： Hongya Ge Ivars P. Kirsteins Department of ECE New Jersey Institute of Technology Newark NJ USA Naval Undersea Warfare Center Newport RI USA

the paper introduces and provides a simple proof of an interesting matrix inversion identity involving subspaces. Using this identity, new insights and interpretations are provided about beam space-based adaptive beamformers and the generalized sidelobe canceller. In addition, system performance measures and losses in terms of the achievable SINR and deflection coefficient can be interpreted and predicted in beam space using the framework of subspaces.

关键词： Matrix decomposition Interference signal to noise ratio Covariance matrix arrays array signal processing Correlation

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