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

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Reducing motion artifacts for robust QRS detection in capacitive sensor arrays 11

Reducing motion artifacts for robust QRS detection in capaci...

引用

4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL'11

作者： Serteyn, Aline Lin, Xintan Amft, Oliver ACTLab Signal Processing Systems TU Eindhoven Netherlands

ISBN: (纸本)9781450309134

Non-contact capacitive ECG measurements (cECG) have applications in various unobtrusive and ubiquitous systems. However, cECG signals are frequently corrupted by interference and motion artifacts. In this work array processing methods, such as blind source separation, were used to reduce the impact of motion artifacts on QRS detection. the capacitive sensor array was integrated in a bed mattress and covered with two insulating sheets. the array processing methods were compared in terms of their QRS detection error rates (De). Results of our study with five healthy subjects in different recording conditions showed that, when using array processing methods, QRS detection performance during body motion can be substantially improved (De reduced from 0.46 on raw sensor data to 0.06 for a channel difference method). We concluded that array processing is a promising approach to achieve motion-resistant QRS detection and thus suggest wider use of capacitive sensor arrays. © 2011 ACM.

关键词： Capacitive sensors

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Direction of arrival estimation of harmonic signal using single moving sensor

Direction of arrival estimation of harmonic signal using sin...

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sensor array and multichannel signal processing workshop

作者： Yusuke Hioka Masako Kishida Department of Electrical and Computer Engineering University of Canterbury Christchurch New Zealand

A signal processing algorithm for estimating the direction of arrival of a harmonic signal using only a single sensor is proposed. the method is based on the recently invented architecture called CAROUSEL, which makes use of the Doppler effect caused by observing signals using the sensor in a circular motion. the proposed method estimates the direction of arrival from the amount of phase shift of a harmonic component caused by the Doppler effect. Simulation using various harmonic signals including synthesised speech phonemes prove the proposed algorithm is able to accurately estimate the direction of arrival of the harmonic signals.

关键词： Direction-of-arrival estimation Harmonic analysis Estimation Frequency estimation arrays signal to noise ratio

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On the amount of training in coordinated massive MIMO systems

On the amount of training in coordinated massive MIMO system...

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sensor array and multichannel signal processing workshop

作者： David Neumann Andreas Gründinger Michael Joham Wolfgang Utschick Associate Institute for Signal Processing Technische Universitat Munchen Munich Germany

Coordinated training significantly reduces the impact of pilot contamination in massive MIMO systems. Moreover, coordinated systems can use additional training resources in an effective manner, making it worthwhile to spend more resources on training than the necessary minimum. For a fixed channel coherence time, we analyze the trade-off between spending resources on training or data symbols for the uncoordinated and the coordinated case.

关键词： Training Base stations Interference MIMO signal to noise ratio Antennas Approximation methods

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Estimation of the Regularization Parameter of an On-Line NMF with Minimum Volume Constraint

Estimation of the Regularization Parameter of an On-Line NMF...

引用

sensor array and multichannel signal processing workshop

作者： Ludivine Nus Sebastian Miron David Brie CRAN Université de Lorraine France

In this paper, the estimation of the regularization parameter of the on-line Non-negative Matrix Factorization (NMF) with minimum volume constraint on sources is addressed. Adding a volume constraint in the model is important to ensure uniqueness of the solution and good data representation. However, the effectiveness of this approach is hampered by the optimal determination of the strength of minimum volume term. To solve this problem, we formulate it as a bi-objective optimization problem and three Minimum Distance Criterion (MDC) strategies are proposed and evaluated. the three strategies yield similar results but one of them in particular yields an interesting tradeoff between accuracy and computation time.

关键词： Hyperspectral imaging signal processing algorithms Noise measurement array signal processing sensor arrays

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Symmetric Sparse Linear array for Active Imaging

Symmetric Sparse Linear Array for Active Imaging

引用

sensor array and multichannel signal processing workshop

作者： Robin Rajamäki Visa Koivunen Department of Signal Processing and Acoustics Aalto University Espoo Finland

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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Interference reduction in wireless passive sensor networks using directional antennas

Interference reduction in wireless passive sensor networks u...

引用

Caneus Fly By Wireless workshop

作者： Razi, Abolfazl Abedi, Ali ECE Dept. University of Maine United States

ISBN: (纸本)9781457709715

In this paper, we study a Wireless Passive sensor Network (WPSN) that employs binary coded differential delay line surface acoustic wave (SAW) devices to monitor temperature in a harsh conditioned environment the sensors are individually addressed by different reflector patterns. the number of sensors in the system is related to the coded reflectors pattern length which itself is limited by the size constraint of sensors. We propose a new sectorized system model for the WPSN by utilizing a phased circular antenna array to increase the number of sensors in the system that yields higher sensing spatial accuracy. Moreover, the sensing accuracy is further improved by a new two-step detection procedure that purifies the response signal and removes the interference of undesired sensors1. © 2011 ieee.

关键词： Wireless sensor networks

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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...

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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

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Sparse Bayesian Learning for DOA Estimation Using Co-Prime and Nested arrays

Sparse Bayesian Learning for DOA Estimation Using Co-Prime a...

引用

sensor array and multichannel signal processing workshop

作者： Santosh Nannuru Peter Gerstoft Ali Koochakzadeh Piya Pal Electrical and Computer Engineering University of California San Diego Scripps Institution of Oceanography University of California San Diego

Sparse Bayesian learning (SBL) has been used to obtain source direction-of-arrivals (DoAs) from uniform linear array (ULA) data. the maximum number of sources that can be resolved using a ULA is limited by the number of sensors in the array. It is known that sparse linear arrays such as co-prime and nested arrays can resolve more sources than the number of sensors. In this paper we demonstrate this using SBL. We compute the mean squared error in source power estimation as various parameters are varied.

关键词： sensor arrays array signal processing signal to noise ratio Bayes methods Covariance matrices Apertures

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Broadband beamspace adaptive beamforming with spatial-only information

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

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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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A heterogeneous Markov chain model of target existence variable for Bayesian track-before-detect

A heterogeneous Markov chain model of target existence varia...

引用

sensor array and multichannel signal processing workshop

作者： S.Z. Xia F.Z. Dai H.W. Liu National Laboratory of Radar Signal Processing Xidian University Xi'an China

A heterogeneous Markov chain (MC) model, instead of the homogeneous MC model, is proposed in this paper to describe target existence variable for Bayesian track-before-detect. the proposed model is more consistent with the transitions of target existence variable, which leads to the improvement of the performance of detection and tracking.

关键词： Target tracking Radar tracking Bayesian methods Particle filters Educational institutions Mathematical model

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