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检索条件"任意字段=2008 IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 1267 条记录，以下是831-840 订阅

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Optimality of multichannel beamforming for spatially correlated multiple-antenna Rayleigh fading channels with channel covariance information at transmitter

Optimality of multichannel beamforming for spatially correla...

引用

sensor array and multichannel signal processing workshop

作者： Mehdi Adibi Vahid Tabataba Vakili Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

In this paper, we derive a closed form necessary and sufficient condition under which rank r multichannel beamforming achieves the capacity of a single user spatially correlated Rayleigh fading channel which employs multiple transmit antennas and a single receive antenna. It is assumed that the receiver has perfect channel side information (CSIR) while the transmitter only knows the channel distribution (CDIT). Additionally, a set of r independent closed form equation is derived that gives the r non-zero eigenvalues of transmit covariance associated to transmit power along each mode.

关键词： Eigenvalues and eigenfunctions array signal processing Covariance matrix Fading MIMO Transmitters Equations

来源：评论

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EXPERIMENTAL EVALUATION OF THE JOINT POSITION-PITCH ESTIMATION (POPI) ALGORITHM IN NOISY ENVIRONMENTS

EXPERIMENTAL EVALUATION OF THE JOINT POSITION-PITCH ESTIMATI...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Tania Habib Marian Kepesi Lukas Ottowitz Signal Processing and Speech Communication Laboratory Graz University of Technology Austria

This paper proposes an enhancement and evaluates the performance of a recently proposed method for joint extraction of pitch and direction of arrival for speaker localization. We propose a new weighting function in order to suppress the cross-terms of the aforementioned method. The performance of the method is evaluated by measuring the correct estimate of position at a frame level. This evaluation analyzes the limits of the method at different background noise levels by using real world recordings. The results show that the proposed algorithm gives more consistent location estimates leading to a reduction in angular deviation by 4.23°at -3 dB SNR.

关键词： signal to noise ratio signal processing algorithms Microphones Joints Speech Estimation Noise measurement

来源：评论

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array self-calibration using SAGE algorithm

Array self-calibration using SAGE algorithm

引用

sensor array and multichannel signal processing workshop

作者： Pei-Jung Chung Shuang Wan Institute for Digital Communications School of Engineering and Electronics University of Edinburgh UK

The performance of most existing array processing algorithms relies heavily on the precise knowledge of array manifold, which is decided by individual sensor characteristics and array configuration. A major challenge for self-calibration techniques is the increased computational burden due to additional perturbation parameters. In this contribution, a novel procedure for array self-calibration is presented. We apply the well known numerical method, the Space Alternating Generalized EM algorithm (SAGE), to simplify the multi-dimensional search procedure required for finding maximum likelihood (ML) estimates. Simulation shows that the proposed algorithm outperforms existing methods that are based on the small perturbation assumption. Furthermore, the proposed algorithm remain robust in critical scenarios including large sensor position errors and closely located signals.

关键词： arrays Direction of arrival estimation signal to noise ratio Calibration Noise Estimation signal processing algorithms

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Wideband DOA estimation for nonuniform linear arrays with Wiener array interpolation

Wideband DOA estimation for nonuniform linear arrays with Wi...

引用

sensor array and multichannel signal processing workshop

作者： T. Kaya Yasar T. Engin Tuncer Electrical and Electronics Engineering Department M.E.T.U. Ankara Turkey

Coherent wideband DOA estimation for non-uniform linear arrays (NLA) is considered. array interpolation is used for two mappings. In the first mapping, NLA is mapped to a uniform linear array with the same array aperture. In the second mapping covariance matrices for each frequency bin are mapped to a single one at the center frequency for coherent DOA estimation. A Wiener formulation is used for array interpolation where both signal and noise powers are estimated with maximum likelihood method. Different approaches are compared and the advantages of wideband processing versus narrowband processing are outlined. The accuracy of the SNR estimation is high and it is shown that Wiener array interpolation significantly improves the DOA estimation performance in both narrowband and wideband processing.

关键词： Interpolation Wideband Direction of arrival estimation Covariance matrix signal to noise ratio array signal processing Estimation

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On the design of sparse arrays using difference sets

On the design of sparse arrays using difference sets

引用

sensor array and multichannel signal processing workshop

作者： Marco Moebus Abdelhak M. Zoubir Signal Processing Group Technische Universität Darmstadt Darmstadt Germany

We address the problem of sparse planar array design. Based on the theory of minimum redundancy arrays, we recently proposed an iterative algorithm that is capable to design highly thinned arrays with a low side-lobe level while retaining the half-power-beam-width of uniform arrays. In this paper, we analyze the effect of kernel bandwidth and compare the approach to a recent paper by Kopilovich which is based on the family of Hadamard difference sets. The results show that the proposed method achieves similar performance with a substantially lower amount of array elements. Side-Lobe-Levels are comparable to the ones from uniform arrays and only slightly higher than for Hadamard-based arrays.

关键词： Apertures Kernel array signal processing Shape Bandwidth Geometry sensor arrays

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NEW SUBSPACE UPDATING ALGORITHM FOR ADAPTIVE DIRECTION ESTIMATION AND TRACKING AND ITS STATISTICAL ANALYSIS

NEW SUBSPACE UPDATING ALGORITHM FOR ADAPTIVE DIRECTION ESTIM...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Jingmin Xin Nanning Zheng Akira Sano Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University China Keio University Yokohama Japan

Subspace estimation is of importance to high-resolution direction estimation in array processing. In this paper, a new recursive least-squares (RLS) algorithm is proposed for null space estimation, which is used to estimate or track the directions of coherent and/or incoherent signals impinging on a uniform linear array (ULA). Especially by investigating the expectation computation of an inverse matrix, the statistical analysis of the RLS algorithm is studied in the mean and mean-squares senses in stationary environment, and further the mean-square-error (MSE) and mean-square derivation (MSD) learning curves are derived explicitly. The theoretical analyses and effectiveness of the proposed RLS algorithm are substantiated through numerical examples.

关键词： Estimation arrays Least squares approximation Algorithm design and analysis Statistical analysis signal processing sensors

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Distinguishing true and false source locations when locating multiple concurrent speech sources

Distinguishing true and false source locations when locating...

引用

sensor array and multichannel signal processing workshop

作者： Mikael Swartling Mikael Nilsson Nedelko Grbic Department of Signal Processing School of Engineering Blekinge Institute of Technology Ronneby Sweden

A permutation problem arises in the case of locating multiple speech sources using several sensor arrays in the far field. The intersection of different direction of arrival (DOA) estimates between sensor arrays leads to a set of real source locations as well as a set of false intersections. This paper presents a novel method for pairing DOA estimates from different sensor arrays, resulting in the corresponding real intersection points. The algorithm presented is numerically efficient and suitable for real time implementations. Real room recordings are used to evaluate the method.

关键词： sensor arrays Direction of arrival estimation Time frequency analysis Speech Source separation Position measurement Speech processing

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OPTIMAL NODE DENSITY FOR TWO-DIMENSIONAL sensor arrayS

OPTIMAL NODE DENSITY FOR TWO-DIMENSIONAL SENSOR ARRAYS

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Youngchul Sung H. Vincent Poor Heejung Yu Dept. of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Dept. of Electrical Engineering Princeton University Princeton NJ USA

The problem of optimal node density for ad hoc sensor networks deployed for making inferences about two dimensional correlated random fields is considered. Using a symmetric first order conditional autoregressive Gauss-Markov random field model, large deviations results are used to characterize the asymptotic per-node information gained from the array. This result then allows an analysis of the node density that maximizes the information under an energy constraint, yielding insights into the trade-offs among the information, density and energy.

关键词： signal to noise ratio Correlation sensors Ad hoc networks Noise Noise measurement Lattices

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Broadband beamspace adaptive beamforming with spatial-only information

Broadband beamspace adaptive beamforming with spatial-only i...

引用

sensor array and multichannel signal processing workshop

作者： Wei Liu Stephan Weiss Department of Electronic & Electrical Engineering Communications Research Group University of Sheffield UK Institute of Comms & Signal Processing Department of Electronic & Electrical Engineering University of Strathclyde UK

A broadband beamspace adaptive beamforming structure for rectangular arrays is proposed. A set of frequency invariant beams are formed pointing to different directions and only one weight is attached to each of the beam outputs. Due to the greatly reduced number of adaptive weights, the system can achieve a much faster convergence speed. Compared to the existing broadband beamspace adaptive methods, the advantage of the proposed method is that there is no temporal processing of the received sensor signals, such as the tapped delay-lines or IIR/FIR filters. Therefore it is a system employing spatial-only information.

关键词： array signal processing Adaptive arrays Broadband communication Finite impulse response filter Broadband antennas Adaptive filters IIR filters

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Resolution enhancement by HOS for small planar arrays

Resolution enhancement by HOS for small planar arrays

引用

sensor array and multichannel signal processing workshop

作者： Ulrich R.O. Nickel FGAN-FKIE Dept Sensor Data and Information Fusion Wachtberg Germany

Higher Order Statistics (HOS) have been proposed to achieve improvements over second order statistics array processing for various applications. We investigate the potential for angle estimation and source resolution with a very small planar array with 3 elements. We use the MUSIC method as generic DOA estimator. Using standard array theory we evaluate conditions under which an improvement in resolution can be obtained. A critical feature is the higher sensitivity of HOS methods to sources of unequal power. In this case standard MUSIC can perform better. A parallel complementary use of both methods is therefore recommended.

关键词： arrays Music Planar arrays Estimation Finite element methods Eigenvalues and eigenfunctions Apertures

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