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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71-80 订阅

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FPGA based real-time detection of spikes within neural signals

FPGA based real-time detection of spikes within neural signa...

引用

3rd ieee sensor array and multichannel signal processing workshop

作者： Keuer, A Schrott, R Taube, J Schmück, D Beikirch, H Baumann, W Bionas GmbH D-18119 Rostock Germany

ISBN: (纸本)0780385454

This paper presents a technique for real time multi-channel signal processing of biological neural data. The major objective is the extraction of action potentials from neural data streams continuously acquired from a multi-electrode sensor array. For the actual detection process a wavelet-based method will be proposed, which allows efficient filtering as well as the definition of a robust threshold. In order to match the real time constraints for the wavelet transform an efficient and fast algorithm (lifting scheme) was used. An exemplary 8-channel implementation will be described exploiting the parallel potentials of a Xilinx Virtex field programmable gate array (FPGA). This work is part of a project concerned with the development of a microsensorchip system for neural data analysis at the University of Rostock, Germany.

关键词： Data processing

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HIGH-RESOLUTION TARGET SENSING USING MULTI-FREQUENCY SPARSE array 11

HIGH-RESOLUTION TARGET SENSING USING MULTI-FREQUENCY SPARSE ...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Ahmed, Ammar Silage, Dennis Zhang, Yimin D. Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA

ISBN: (纸本)9781728119465

In this paper, we discuss high-resolution target sensing through the exploitation of multi-frequency sparse array processing. By using simple design examples of a three-element sensor array coupled with the sensing signals consisting of three well-designed frequencies, we provide insights to achieve a high number of consecutive lags, unique lags, and array aperture. Such multi-frequency sensor arrays with reduced number of sensors can be attractive in many applications to achieve effective sensing with a low cost.

关键词： Sparse array multi-frequency sensing group sparsity DOA estimation

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Robust supergain beamforming for circular array via second-order cone optimization

Robust supergain beamforming for circular array via second-o...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Yan, SF Ma, YL Northwestern Polytech Univ Inst Acoust Engn Xian 710072 Peoples R China

ISBN: (纸本)0780385454

The phenomenon Of supergain for a circular array and its robust version are presented. The superdirective array gain for the Circular array, although it is not so extreme as an endfire line array, Outperforms a lot over that of a conventional beamformer in isotropic noise fields when the interelement spacings are less than one-half wavelength. However, optimum beamforming algorithms can be extremely sensitive to slight errors in array characteristics. The performance are known to degrade if some of underlying assumptions on the sensor array violated. Therefore white noise gain constraint (WNC) is used to increase the robustness Of supergain beamforming against random errors. We show that the robust supergain beamforming can be reformulated in a form of second-order cone programming and resolved easily. Some Computer Simulations are also given to illustrate the presented approach.

关键词： signal processing

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Large phased array radar using networked small parabolic reflectors

Large phased array radar using networked small parabolic ref...

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4th ieee sensor array and multichannel signal processing workshop

作者： Amoozegar, Farid CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)1424403081

Multifunction phased array systems with radar, telecom, and imaging applications have already been established for flat plate phased arrays of dipoles, or waveguides. In this paper the design trades and candidate options for combining the radar and telecom functions of the deep space network (DSN) into a single large transmit array of small parabolic reflectors will be discussed. In particular the effect of combing the radar and telecom functions on the sizes of individual antenna apertures and the corresponding spacing between the antenna elements of the array will be analyzed. A heterogeneous architecture for the DSN large transmit array is proposed to meet the radar and telecom requirements while considering the budget, scheduling, and strategic planning constrains.

关键词： Radar systems

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SPARSE BAYESIAN LEARNING FOR DOA ESTIMATION OF CORRELATED SOURCES 10

SPARSE BAYESIAN LEARNING FOR DOA ESTIMATION OF CORRELATED SO...

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Mecklenbraeuker, Christoph F. Gerstoft, Peter Leus, Geert TU Wien Inst Telecommun A-1040 Vienna Austria Univ Calif San Diego La Jolla CA 92093 USA Delft Univ Technol Dept Elect Engn Math & Comp Sci Delft Netherlands

ISBN: (纸本)9781538647523

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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Blind identification of under-determined complex mixtures of independent sources

Blind identification of under-determined complex mixtures of...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Comon, P Rajih, M I3S Lab F-06903 Sophia Antipolis France

ISBN: (纸本)0780385454

This paper is devoted to under-determined linear mixtures of independent random variables (i.e. with more inputs than outputs). Blind identifiability of general under-determined mixtures is first discussed, and the maximum number of sources is given, depending on the hypotheses assumed. Then an algorithm proposed by Taleb, essentially usable for 2-dimensional mixtures, is extended to the complex field. A procedure is proposed in order to avoid the enormous increase in complexity. Computer simulations demonstrate the ability of the algorithm to identify mixtures of N QPSK sources received on 1 or 2 sensors.

关键词： signal processing

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Symmetric Sparse Linear array for Active Imaging 10

Symmetric Sparse Linear Array for Active Imaging

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Rajamaki, Robin Koivunen, Visa Aalto Univ Sch Elect Engn Dept Signal Proc & Acoust Espoo 02150 Finland

ISBN: (纸本)9781538647523

Sparse sensor arrays can achieve significantly more degrees of freedom than the number of elements by leveraging the co-array, a virtual structure that arises from the far field narrowband signal model. Although several sparse array configurations have been developed for passive sensing tasks, less attention has been paid to arrays suitable for active sensing. This paper presents a novel active sparse linear array, called the Interleaved Wichmann array (IWA). The IWA only has a few closely spaced elements, which may make it more robust to mutual coupling effects. Closed-form expressions are provided for the key properties of the IWA. The parameters maximizing the array aperture for a given even number of elements are also found. The near field wideband performance of the array is demonstrated numerically in a coherent imaging scenario.

关键词： sensor arrays array signal processing Apertures Imaging Delays Wideband"

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Preprocessing Algorithm for Source Localisation in a Multipath Environment

Preprocessing Algorithm for Source Localisation in a Multipa...

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Venieris, Evangelos Manikas, Athanassios Univ London Imperial Coll Sci Technol & Med Dept Elect & Elect Engn Exhibit Rd London England

ISBN: (纸本)9781479914814

Several methods have been developed which allow the estimation of the location of an existing source with considerable accuracy in the absence of multipaths. However, if, in addition to the Line-of-Sight (LOS) path, non-LOS (NLOS) paths are also present, then all existing localisation algorithms dramatically fail to estimate the location of the source. In this paper, a passive array processing algorithm is proposed, which, if used prior to a localisation approach, suppresses all the multipath contributions in the received signal except for that of the LOS path. The performance of the proposed algorithm is evaluated through computer simulation studies.

关键词： array signal processing localisation multipath spherical wave propagation

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Performance comparison of robust array algorithms in delay estimation

Performance comparison of robust array algorithms in delay e...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Puska, H Saarnisaari, H Oulu Univ Ctr Wireless Commun FI-90014 Oulu Finland

ISBN: (纸本)0780385454

Impulsive interference mitigation capabilities of robust array algorithms are considered in delay estimation of a direct sequence spread spectrum (DS/SS) system. The simulations are done in the environment where the direction of arrival (DOA) of individual impulses is either random or fixed. It is shown that the minimum variance distortionless response (MVDR) beamforming algorithm without any interference suppression algorithm is sufficient if impulses are arriving from a fixed DOA. In the random DOA case the performance of the MVDR beamformer algorithm alone is very poor and impulse suppression methods are needed. The paper compares four different impulse suppression methods. It is shown that the best algorithm allow over 60% of snapshots to be corrupted.

关键词： Algorithms

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DETECTION AND LOCALIZATION OF EMITTERS IN THE PRESENCE OF MULTIPATH USING A UNIFORM LINEAR ANTENNA array

DETECTION AND LOCALIZATION OF EMITTERS IN THE PRESENCE OF MU...

引用

ieee sensor array and multichannel signal processing workshop

作者： Sarac, Ugur Harmanci, F. Kerem Akguel, Tayfun Istanbul Tech Univ Dept Elect & Commun Engn TR-80626 Istanbul Turkey Bogazici Univ Dept Elect & Elect Eng TR-80815 Bebek Turkey TUBITAK Natl Res Inst Elect & Cryptol Izmir Kocaeli Turkey TUBITAK Earth & Marine Sci Inst MRC Izmir Kocaeli Turkey

ISBN: (纸本)9781424422401

In this paper, we present a new application of the likelihood ratio test to solve the problem of enumeration and localization of multiple emitters (sources) with a uniform linear antenna array in a multi-path environment. First, spatial smoothing is applied to the antenna array data to decorrelate signals corresponding to each path in the estimated correlation matrix and the number of paths is then counted using an information theoretic criterion. Then, MUSIC is applied with this correlation matrix to estimate the angle of arrival of all possible incident paths. In our signal model, we assume that the correlation between signals from two paths is one if they originate from the same source but zero if they are from different sources. The likelihood ratio test is then applied to each path pair using this correlation model and the angles of arrival estimated by MUSIC in order to find out if the path pair originates from the same emitter, and hence the number of emitters and their angles of arrival are estimated. The proposed algorithm on the likelihood ratio test is compared with the correlation coefficient algorithm based on minimum variance beam-forming with a performance analysis.

关键词： Direction finding likelihood ratio antenna array MUSIC multipath

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