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ieee sensor array and multichannel signal processing workshop

作者： Hassanein, Abdulnasr Vorobyov, Sergiy A. Gershman, Alex B. Rübsamen, Michael University of Alberta Electrical and Computer Engineering Edmonton AB T6G 2V4 Canada Darmstadt University of Technology Communication Systems Group 64283 Darmstadt Germany

ISBN: (纸本)9781424489770

In this paper, we develop a new maximum likelihood (ML) moving target parameter estimation technique for multipleinput multiple-output (MIMO) radar. It is required for this technique that different receive antennas have the same time reference, but no synchronization of initial phases of the receive antennas is needed and, therefore, the estimation process is noncoherent. The target motion within a certain processing interval is modeled as a second-order polynomial whose coefficients are given by the initial location, velocity, and acceleration of the target. The proposed ML estimator is able to jointly process the data collected from multiple consecutive radar pulses. It is shown that the considered ML problem simplifies to the classic "overdetermined" nonlinear least-squares problem. The proposed ML estimator requires multi-dimensional search over the unknown location, velocity, and acceleration parameters. The performance of the proposed estimator is validated by simulation results. © 2010 ieee.

关键词： Receiving antennas

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Inherent signal preprocessing in the line CCD sensor 2

Inherent signal preprocessing in the line CCD sensor

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2nd ieee International workshop on Intelligent Data Acquisition and Advanced Computing Systems

作者： Kejzar, L Fischer, J Czech Tech Univ Fac Elect Engn Dept Measurement Prague 16627 6 Czech Republic

ISBN: (纸本)0780381386

The paper. is devoted to the description and practical verification of a new CCD linear image sensor control method. This method is used for inherent signal preprocessing or processing in the CCD linear image sensor. This new method is suitable for a movement compensation, an one-frame filtration or a two-frame filtration. Because of the similarity between the Non-Recursive Digital Filter with Finite Impulse Response (NRDF FIR) and the new mode it was named FIR mode. Conclusions and hints applicable for operation of CCD image sensor in FIR mode are also included in the paper.

关键词： CCD signal processing FIR filter

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Monitoring volcanic eruptions with a wireless sensor network

Monitoring volcanic eruptions with a wireless sensor network

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2nd European workshop on Wireless sensor Networks

作者： Werner-Allen, G Johnson, J Ruiz, M Lees, J Welsh, M Harvard Univ Cambridge MA 02138 USA

ISBN: (纸本)0780388011

This paper describes our experiences using a wireless sensor network to monitor volcanic eruptions with low-frequency acoustic sensors. We developed a wireless sensor array and deployed it in July 2004 at Volcan Tungurahua, an active volcano in central Ecuador. The network collected infrasonic (low-frequency acoustic) signals at 102 Hz, transmitting data over a 9 km wireless link to a remote base station. During the deployment, we collected over 54 hours of continuous data which included at least 9 large explosions. Nodes were time-synchronized using a separate GPS receiver, and our data was later correlated with that acquired at a nearby wired sensor array. In addition to continuous sampling, we have developed a distributed event detector that automatically triggers data transmission when a well-correlated signal is received by multiple nodes. We evaluate this approach in terms of reduced energy and bandwidth usage, as well as accuracy of infrasonic signal detection.

关键词： Mobile computing

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A relationship between time-reversal imaging and maximum-likelihood scattering estimation

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ieee TRANSACTIONS ON signal processing 2007年第9期55卷 4707-4711页

作者： Shi, Gang Nehorai, Arye IEEE Division of Biostatistics Washington University School of Medicine Department of Electrical and Systems Engineering Washington University

Time-reversal methods have attracted increasing interest recently. The so-called computational time-reversal approach creates an image of the illuminated scene by computing the back-propagated field and is useful for detecting and estimating targets in the scene. In Shi and Nehorai ["Maximum Likelihood Estimation of Point Scatterers for Computational Time-Reversal Imaging," Communications in Information and Systems, vol. 5, no. 2, pp. 227-256, 20051], we estimated point scatterers by maximum-likelihood estimate (MLE) using the Born-approximated physical model, as well as the Foldy-Lax model. In this correspondence, we further find an explicit relationship between energy-based basic time-reversal imaging and the MLE approach: the time-reversal imaging function differs by only a scaling factor from the likelihood imaging function using the estimated scattering potential when a single-scatterer model is employed. Furthermore, this scaling factor is a function of the imaging position only. We show that, as a result, time-reversal imaging has a near-far problem that tends to produce a weaker image for areas further away from the imaging arrays, whereas the MLE-based image is more balanced. Experimental results confirm this conclusion.

关键词： maximum-likelihood estimate (MLE) multistatic near-far problem time-reversal imaging

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Maximum likelihood array processing: The semi-blind case 2

Maximum likelihood array processing: The semi-blind case

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2nd ieee workshop on signal processing Advances in Wireless Communications, SPAWC 1999

作者： Kozick, Richard J. Sadle, Brian M. Electrical Engineering Department Bucknell University LewisburgPA17837 United States Army Research Laboratory AMSRL IS TA 2800 Powder Mill Road AdelphiMD20783 United States

ISBN: (纸本)0780355997

Protocols for digital wireless communication systems generally contain known bit sequences that are transmitted periodically for the purposes of training and/or synchronization. We study the performance improvement that is obtained in antenna array processing when knowledge of the signal waveforms is exploited. Our model is formulated such that the signals from multiple sources are known for a subset of the data samples and unknown for the remainder of the samples. Maximum likelihood (ML) estimates of the signal parameters are derived for this model, and the Cramer-Rao bound (CRB) on the accuracy of source location estimates is presented. Numerical evaluations of the CRB are included to illustrate the performance when partial training data is available in one or more of the sources. © 1999 ieee.

关键词： array processing

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Fractionally-spaced array processing for fast fading cellular TDMA signals using cyclic higher-order cumulants 2

Fractionally-spaced array processing for fast fading cellula...

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2nd ieee workshop on signal processing Advances in Wireless Communications, SPAWC 1999

作者： Max Martonet, Massimiliano Watkins-Johnson Co. GaithersburgMD United States

ISBN: (纸本)0780355997

A new approach to cochannel interference rejection in frequency selective fading using an antenna array is presented. The fundamental idea is to exploit the higher-order cyclostationarity of the digitally modulated signals received at the antenna array. The problem of minimizing the noise-free time averaged mean squared error is shown to be equivalent to the problem of minimizing a cost function involving space-time contractions of fourth-order cyclic cumulants. The method is effective in fast fading environments such as those specified in IS-136, the US digital TDMA cellular standard. Results of computer simulations and hardware experiments are presented. © 1999 ieee.

关键词： Antenna arrays

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Lower bounds for non standard deterministic estimation

Lower bounds for non standard deterministic estimation

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2016 ieee sensor array and multichannel signal processing workshop, SAM 2016

作者： Galy, Jerome Chaumette, Eric Vincent, Francois Renaux, Alexandre Larzabal, Pascal Université de Montpellier 2 Montpellier France ISAE-SUPAERO Universite de Toulouse Toulouse Cedex 431055 France Université Paris-Sud/LSS 3 Rue Joliot-Curie Gif-sur-Yvette France Université Paris-Sud/SATIE 61 av. du President Wilson Cachan France

ISBN: (纸本)9781509021031

In this paper, non standard deterministic parameters estimation is considered, i.e. the situation where the probability density function (p.d.f.) parameterized by unknown deterministic parameters results from the marginalization of a joint p.d.f. depending on additional random variables. Unfortunately, in the general case, this marginalization is mathematically intractable, which prevents from using the known deterministic lower bounds on the mean-squared-error (MSE). However an embedding mechanism allows to transpose all the known lowers bounds into modified lower bounds fitted with non-standard deterministic estimation, encompassing the modified Cramér-Rao / Bhattacharyya bounds and hybrid lower bounds. © 2016 ieee.

关键词： Mean square error

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SPATIAL SPECTRAL FILTERING WITH LINEARLY CONSTRAINED MINIMUM VARIANCE BEAMFORMERS

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ieee TRANSACTIONS ON ACOUSTICS SPEECH And signal processing 1987年第3期35卷 249-266页

作者： BUCKLEY, KM Department of Electrical Engineering University of Minnesota Minneapolis MN USA

In this paper, orthogonal low-dimension models for broad-band sources, as observed by an array/delay-line structure, are developed. The models are termed broad-band source representation spaces, and are subspaces of the observation space. They are generated from eigenstructures of source sample covariance matrices and represent sources efficiently in the 2nd-order statistical sense. For a single broad-band source, propagating in a pure delay environment and observed with an isotropic array, an accurate indication of the model dimension is derived which is independent on the array configuration, being a function of the observed source time-bandwidth product only. Using these representations, procedures are described for controlling the spatial and spectral response of linearly constrained minimum variance broad-band array/beamformers. The procedures employ linear constraints to control complex gain characteristics, over selected bands of frequency, for multiple points of 3-D regions of source locations and do not require the use of steering delays. The constraints are derived from source representation spaces and are termed eigenvector constraints. Simulations are presented which illustrate the effectiveness of the new linear constraints.

关键词： Filtering Frequency Filters sensor phenomena and characterization Adaptive arrays Delay lines Covariance matrix Propagation delay Ear signal design

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New trends in deterministic lower bounds and SNR threshold estimation: From derivable bounds to conjectural bounds

New trends in deterministic lower bounds and SNR threshold e...

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ieee sensor array and multichannel signal processing workshop

作者： Chaumette, Eric Renaux, Alexandre Larzabal, Pascal ONERA DEMR/TSI French Aerospace Lab. Chemin de la Hunière F-91120 Palaiseau France Universite Paris-Sud 11 L2S Rue Joliot Curie F-91190 Gif-Sur-Yvette France SATIE ENS Cachan CNRS 61 Av President Wilson F-94230 Cachan France

ISBN: (纸本)9781424489770

It is well known that in non-linear estimation problems the ML estimator exhibits a threshold effect, i.e. a rapid deterioration of estimation accuracy below a certain SNR or number of snapshots. This effect is caused by outliers and is not captured by standard tools such as the Cramer-Rao bound (CRB). The search of the SNR threshold value can be achieved with the help of approximations of the Barankin bound (BB) proposed by many authors. These approximations may result from linear or non-linear transformation (discrete or integral) of the uniform unbiasedness constraint introduced by Barankin. Additionally, the strong analogy between derivations of deterministic bounds and Bayesian bounds of the Weiss-Weinstein family has led us to propose a conjectural bound which outperforms existing ones for SNR threshold prediction. © 2010 ieee.

关键词： Mean square error

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Mining mobile sensor data for social behaviors 2

Mining mobile sensor data for social behaviors

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2nd International workshop on Social Sensing, SocialSens 2017

作者： Li, Huan Gou, Yuanjie School of CS and Eng. Beihang University Beijing100191 China

ISBN: (纸本)9781450349772

sensor devices widely used on vehicles enable the massive data collection for social behavior analysis. We mined trajectory data and on-board sensor data for point-of-interest (POI) locations, which further indicate public and personal social properties. We propose a method to rank the significance of the POIs that represent those social behaviors. © 2017 ACM.

关键词： Data mining

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