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Fast rank-adaptive beamforming

Fast rank-adaptive beamforming

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： McWhorter, T Mission Res Corp Monterey CA 93940 USA

ISBN: (纸本)0780363396

This paper is concerned with the construction of an adaptive beamformer, which uses the dominant subspace information of a sample covariance matrix. We assume that the sample covariance matrix and its eigenvalue decomposition (EVD) are to be updated as data arrive. We present a unified structure for updating the EVD and introduce a robust method for adapting the rank of the dominant subspace. We use the EVD of the sample covariance matrix to build a fast rank- and weight-adaptive beamformer. A useful component of the beamforming routine is a fast algorithm for updating the estimates of the direction of arrival of the dominant sources.

关键词： Algorithm design and analysis array signal processing Bibliographies Covariance matrix Eigenvalues and eigenfunctions Joining processes Matrix decomposition Performance evaluation Robustness Stochastic processes

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Second-order statistics blind MIMO-FIR channel equalization for antenna array-based wireless communications systems

Second-order statistics blind MIMO-FIR channel equalization ...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Luo, H Liu, RW AT&T Labs Res Red Bank NJ 07701 USA

ISBN: (纸本)0780363396

A theoretic framework on blind MIMO-FIR channel equalization by use of SOS (second-order statistics) is established in this paper. First, a sufficient condition is given on the autocorrelations of source signals. Under this condition, it is guaranteed that an MIMO-FIR channel is equalized up to some scalar factors and some delays if, and only if, some SOS of composite output signals are the same as that of source signals. Subsequently, the concept of pre-filters are introduced to convert white sources, which don't satisfy this sufficient condition, into color ones that do satisfy it. Based on the sufficient condition and the pre-filters, a set of theorems are developed for blind MIMO-FIR channel equalization, which only use the SOS of the received signals. At last, a computer simulation is conducted to verify this theory. The theory and methods can be applied to antenna array-based wireless communications systems for high bandwidth efficiency.

关键词： Antenna arrays Antenna theory Autocorrelation Bandwidth Blind equalizers Computer simulation Delay Statistics Sufficient conditions Wireless communication

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Acoustic field conformation using multichannel active noise control techniques.

Acoustic field conformation using multichannel active noise ...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： de Diego, M Gonzalez, A Pinero, G Garcia, C Ferrer, M Univ Politecn Valencia Dept Comunicaciones Valencia 46022 Spain

ISBN: (纸本)0780363396

This paper describes the experimental application of sensors array and multichannel digital signal processing to the equalization of the acoustic field in car compartments. The aim of this multichannel active noise control system is not simply to cancel undesirable noise but to reshape the sound field around the listener's head. A modified version of the filtered-X LMS active noise equalizer algorithm has been developed and extended to multiple channels. A 4100 type Bruel dummy head and torso with two calibrated microphones at the ear's canals has been used to obtain sound levels in an hypothetic listener's ears. The equalization points are not only the error sensors position bat an area around them which is measured using the manikin. It has been found that at low frequencies the zones of equalization created around the point of control are larger enough to cover the movements of the head without disturbing algorithm 's stability.

关键词： Acoustic arrays Acoustic noise Acoustic sensors Active noise reduction Digital signal processing Ear Noise cancellation sensor arrays sensor phenomena and characterization signal processing algorithms

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Maximum likelihood source localization using the EM algorithm to incorporate prior parameter distributions

Maximum likelihood source localization using the EM algorith...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Perry, R Buckley, K Villanova Univ ECE Dept Villanova PA 19085 USA

ISBN: (纸本)0780363396

In this paper we introduce a new algorithm for the estimation of source location parameters from array data given prior distributions on unknown nuisance source signal parameters. The conditional maximum-likelihood (CML) formulation is employed, and ML estimation is obtained by marginalizing over the nuisance parameters. In general, direct solution of this marginalization ML problem is intractable. We introduce an expectation-maximization. (EM) algorithm solution, which is applicable to any prior distribution.

关键词： Acoustic applications Biomedical acoustics Biomedical engineering Maximum likelihood estimation Parameter estimation Position measurement Radar applications sensor arrays signal processing algorithms Sonar applications

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High resolution direction of arrival estimation methods applied to measurements from a digital array antenna

High resolution direction of arrival estimation methods appl...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Björklund, S Heydarkhan, A Def Res Estab FOA SE-58111 Linkoping Sweden

ISBN: (纸本)0780363396

At the Defence Research Establishment of Sweden (FOA) an experimental S-band receiving digital array antenna for radar applications has been designed and built. It consists of a horizontal uniform linear array (ULA) of 12 antenna elements, whose digitized signals are processed in non-real time in a computer. Accurate calibration is utilized. We have compared several spectral and parametric direction-of-arrival (DOA) estimation methods for varying DOA separations, number of samples and signal-to-noise ratios (SNR) on measured data from an anechoic chamber. At ideal conditions the resolution can be improved considerably with model based DOA methods compared to conventional beamforming. We achieved a resolution below 1/10 of the resolution of conventional beamforming.

关键词： Antenna arrays array signal processing Calibration Direction of arrival estimation Linear antenna arrays Radar antennas Radar applications Receiving antennas signal processing signal resolution

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multichannel matched transmit-receiver design in presence of signal-dependent interference and noise

Multichannel matched transmit-receiver design in presence of...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Pillai, SU Oh, HS Guerci, JR Polytech Univ Dept Elect Engn Brooklyn NY 11201 USA

ISBN: (纸本)0780363396

In presence of targets that respond to transmitter diversity such as polarization, to maximize the output SINR, it becomes necessary to jointly optimize the transmit signal vector and the receiver bank of filters in presence of signal dependent interference and noise. This multichannel matched transmitter-receiver structure is superior to its scalar counterpart, since several aspects of the signal dependent interference spectrum are "brought to light" in this case. The cross-interference spectral matrices infact contain much more information compared to the single channel case, and despite the highly nonlinear nature of the problem, it is possible to derive a closed form solution for the optimum matched receiver filter bank. lit addition, an iterative algorithm that appears to converge for all SINR is proposed to determine the optimum transmit signal vector.

关键词： Closed-form solution Interference Iterative algorithms Layout Polarization Radar clutter sensor arrays signal design signal to noise ratio Transmitters

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Detection of more uncorrelated Gaussian sources than sensors using fully augmentable sparse antenna arrays

Detection of more uncorrelated Gaussian sources than sensors...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Abramovich, YI Spencer, NK Gorokhov, AY CSSIP Cooperat Res Ctr Sensor Signal & Informat Proc Mawson Lakes SA 5095 Australia

ISBN: (纸本)0780363396

We introduce a new approach to the detection problem for "fully augmentable" arrays (whose set of intersensor differences is complete). We propose a transformation of the directly augmented (non-positive-definite) Toeplitz matrix into a p.d Toeplitz matrix T-mu with the proper number of equal minimum eigenvalues, appropriate for the candidate number of sources mu. comparison of the results of these best-fit transformations over the range of candidates then allows us to select the most likely number of sources (m) over cap using traditional criteria, Simulation results demonstrate the high performance of this method.

关键词： Antenna arrays Australia Covariance matrix Direction of arrival estimation Eigenvalues and eigenfunctions Information processing Lakes sensor arrays signal processing Statistics

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Adaptive digital beamforming for preserving monopulse target angle estimation accuracy in jamming

Adaptive digital beamforming for preserving monopulse target...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Yu, KB Murrow, DJ GE Res & Dev Ctr Niskayuna NY 12309 USA

ISBN: (纸本)0780363396

The monopoulse technique for target angle estimation fails when there is sidelobe and/or mainlobe jamming. If not effectively encountered, electronic jamming prevents successful radar target detection and tracking. We have developed a technique which cancels one mainlobe jammer and multiple sidelobe jammers in such a way that enables both target detection and unbiased monopulse angle estimation. Our technique makes use of adaptive digital beamforming for sidelobe jamming cancellation followed by a mainlobe canceller for mainlobe jamming cancellation. A constrained adaptation is imposed to maintain the mainbeam in the sidelobe cancellation process.

关键词： Adaptive arrays array signal processing Direction of arrival estimation Jamming Object detection Phased arrays Radar tracking signal processing algorithms signal to noise ratio Target tracking

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Spatial characterization of indoor radio channel measurements at 5 GHz

Spatial characterization of indoor radio channel measurement...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Stridh, R Ottersten, B Royal Inst Technol Dept Signals Sensors & Syst S-10044 Stockholm Sweden

ISBN: (纸本)0780363396

Multiple transmitters and receivers can be used to provide high link capacity in future wireless systems. Herein analysis of real indoor environment Multiple-Input-Multiple-Output measurements on the 5.8 GHz band is performed. The possible increase in capacity, utilizing multiple transmit and receive elements is examined. The gain possible when using channel knowledge at both transmitter and receiver is shown and the capacity dependence on the intra-element distance is examined for the experimental system and compared to simulations.

关键词： Handheld computers Indoor radio communication MIMO Radio transmitters Receivers Receiving antennas sensor phenomena and characterization sensor systems Transmitting antennas Wireless LAN

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Numerically-robust adaptive subspace tracking using householder transformations

Numerically-robust adaptive subspace tracking using househol...

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Douglas, SC So Methodist Univ Dept Elect Engn Dallas TX 75275 USA

ISBN: (纸本)0780363396

In this paper, we develop simple principal and minor subspace tracking algorithms that exactly maintain the orthonormality of the subspace matrix estimate over time. Each of these algorithms use m identical Householder transformations to update the rows of the subspace matrix estimate at each time instant. Unlike many other approaches, ours have asymptotic complexities that scale linearly with the number of adaptive coefficients. We show that existing gradient-based and projection approximation subspace tracking (PAST) methods are first-order approximate versions of our proposed methods, and we also derive several more-accurate approximations. Simulations verify the excellent numerical behaviors of the proposed methods in subspace tracking tasks.

关键词： Algorithm design and analysis Approximation algorithms array signal processing Data mining Data visualization Pattern recognition signal processing

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