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Subspace Tracking with Dynamical Models on the Grassmannian

Subspace Tracking with Dynamical Models on the Grassmannian

引用

sensor array and multichannel signal processing workshop

作者： Alex Saad-Falcon Brighton Ancelin Justin Romberg Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (数字)9798350344813

ISBN: (纸本)9798350344820

Tracking signals in dynamic environments presents difficulties in both analysis and implementation. In this work, we expand on a class of subspace tracking algorithms which utilize the Grassmann manifold - the set of linear subspaces of a high-dimensional vector space. We design regularized least squares algorithms based on common manifold operations and intuitive dynamical models. We demonstrate the efficacy of the approach for a narrowband beamforming scenario, where the dynamics of multiple signals of interest are captured by motion on the Grassmannian.

关键词： Manifolds array signal processing Tracking Heuristic algorithms Computational modeling signal processing algorithms Vectors

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Localization of orphan utility meters based on spatio-temporal signature information

Localization of orphan utility meters based on spatio-tempor...

引用

sensor array and multichannel signal processing workshop

作者： Yimin Zhang Xin Li Emmanuel Monnerie Glenn A. Pritchard Ruben Salazar Cardozo Wireless Communications and Positioning Laboratory Advanced Communications Villanova University Villanova PA USA Cellnet Hunt Alpharetta GA USA Meter Reading Technologies PECO Philadelphia PA USA

As utilities convert from manual meter reading to automated systems, a new set of operation challenges arise in the day-to-day operation of the metering system. One of the most significant problems occurs when a meter is installed, but the physical location of the meter has not been properly recorded by the utilitiespsila system of record. This condition is commonly referred to as an ldquoorphanrdquo meter. Current methods of locating orphan meters are manual and time intensive. This paper presents a new method for electronically locating orphan meters. The technique leverages spatio-temporal correlations between the reference meters and the orphan meter. Additional information, such as the received signal power, is also used to provide more robust location estimation performance. Ray-tracing simulation and field measurement results have shown promising localization results of the orphan meters.

关键词： Receivers Correlation arrays Wireless communication Ray tracing Antenna measurements Wireless sensor networks

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Performance Analysis of Linear Predictive Super-Resolution processing for Antenna arrays

Performance Analysis of Linear Predictive Super-Resolution P...

引用

sensor array and multichannel signal processing workshop

作者： Honglei Chen D. Kasilingam Department of Electrical & Computer Engineering University of Massachusetts Dartmouth North Dartmouth MA USA

Many applications in array processing require a high resolution beamforming method. For example, spatial division multiple access (SDMA) has been proposed to achieve higher system capacity in wireless systems. Implicit in SDMA is the ability to adaptively generate narrow antenna beam patterns, which ensures the physical separation between users and minimizes multiple user interference. However, antenna theory requires large antenna apertures to generate narrow beam patterns. This paper discusses an adaptive algorithm for extrapolating measurements from a small antenna array to a much larger virtual array. The technique utilizes linear prediction (LP) methods to perform the extrapolation. A least mean square (LMS) based algorithm was used to estimate the LP coefficients. Since the algorithm is linear, it serves both as a direction-of-arrival (DoA) estimator and a matched filter for retrieving the transmitted signal. Other popular high-resolution algorithms such as MUSIC are inherently nonlinear and thus cannot be used on their own for retrieving signal information. The performance of this algorithm is studied with respect to interference suppression, noise and spatial resolution. It is shown that the HR filter representing the LP process has poles corresponding to the DoA of the signal. The resulting LP coefficients can eliminate the interference between signals from different transmitters. However, no improvement in noise performance is seen because the receiver noise couples into the extrapolation process when two transmitters are closely located. The extrapolation algorithm is compared with the LCMV algorithm and found to produce similar results

关键词： Linear antenna arrays Performance analysis Adaptive arrays Spatial resolution Extrapolation array signal processing Multiaccess communication Aperture antennas Antenna theory Antenna arrays

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On time-invariant FDA beam-pattern design based on time-dependent frequency offsets

On time-invariant FDA beam-pattern design based on time-depe...

引用

sensor array and multichannel signal processing workshop

作者： Jiantao Shi Nanjing Research Institute of Electronic Technology Nanjing China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In the existing works on FDA beam-patterns produced by the traditional FDA are time variant, and this causes difficulties in target detecting and beam-pattern steering. For solving the problem, several time-dependent frequency offsets based time-invariant FDA beam-pattern design methods have been proposed, which, however, neglected the time-range relationship and led to erroneous conclusions. In this note, considering the practical constraint and the relationship between time and range, it is concluded that FDA beam-patterns are always time-variant and it is unable to form time-invariant beam-patterns.

关键词： Time-frequency analysis array signal processing Simulation Design methodology Conferences Frequency diversity sensor arrays

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Analysis of a Fixed Point Iteration Algorithm for TOA Localization

Analysis of a Fixed Point Iteration Algorithm for TOA Locali...

引用

sensor array and multichannel signal processing workshop

作者： Yanbin Zou Yangpeng Xiao Huaping Liu Department of EE Shantou University Shantou Guangdong China School of EECS Oregon State University Corvallis OR U.S.A.

ISBN: (数字)9798350344813

ISBN: (纸本)9798350344820

A recent work on a fixed point iteration (FPI) al-gorithm for time-of-arrival localization has shown great promise for lower implementation complexity than existing algorithms without compromising on performance. However, this work did not provide a theoretical analysis. In the current paper, we pro-vide a comprehensive theoretical analysis of the convergence and performance of the FPI algorithm. These analyses reveal several useful conclusions about the characteristics of the estimator.

关键词： Location awareness Maximum likelihood estimation array signal processing Conferences Noise signal processing algorithms Complexity theory

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A parametric spatio-temporal channel estimation technique for FDD UMTS uplink

A parametric spatio-temporal channel estimation technique fo...

引用

sensor array and multichannel signal processing workshop

作者： M. Chenu-Tournier P. Chevalier J.-P. Barbot Thomson-CSF-Commun. Gennevilliers France BSR/TBR/TSI Thomson CSF Communication France L. E. S. I. R Cachan France

Many multi-user receivers have been developed to mitigate the effects of both multipath and interference in CDMA radiocommunication networks. However despite of these works, very few papers have been devoted to the implementation of these receivers and, more precisely, to the channel estimation problem in both multi-user and FDD UMTS context. Assuming specular propagation channels and a multi-sensor receiver; the purpose of this paper is to present a parametric technique for the joint estimation of the delays and angles of arrival of the propagation channels between each user and the array of sensor for the FDD UMTS uplink. The quality of the latter are then evaluated through mean square error (MSE) computations and bit error rates (BER) after demodulation at the output of two receivers (2D-RAKE and decorrelator receiver) adapted to the FDD UMTS uplink.

关键词： Channel estimation 3G mobile communication sensor arrays Delay estimation Bit error rate Interference Multiaccess communication Propagation delay Mean square error methods Demodulation

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Precoding for RadComm Systems Based on Hybrid Antenna arrays

Precoding for RadComm Systems Based on Hybrid Antenna Arrays

引用

sensor array and multichannel signal processing workshop

作者： Freddy Y.P. Feng Lei Huang School of Information Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

Integrated wireless communications and radar detections have so far mainly relied on phased-array (PA) antennas with only considering the beampatterns in angle domain. By applying the frequency diverse array (FDA) into radar and communications (RadComm) systems, a compact dual-functional structure of joint PA and FDA is designed. Based on the built joint PA and FDA channel models, different beamformer designs are proposed by jointly optimizing the signal-to-interference-noises of the communications and radar. Numerical simulations demonstrate the performances of both communications and the radar with the proposed approaches are over than that of the conventional PA RadComm systems.

关键词： Wireless communication array signal processing Radar detection Radar Interference Radar antennas Numerical simulation

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Passive range estimation and range rate detection

Passive range estimation and range rate detection

引用

sensor array and multichannel signal processing workshop

作者： R. Jeffers B. Breed B. Gallemore Digital Syst. Resource Inc. Fairfax VA USA Breed and Harvel Associates Austin TX USA Digital Systems Resources Inc. Fairfax VA USA

The problem of interest is a rapidly closing object (e.g. a torpedo) emitting broadband and narrowband acoustic signatures. A high negative range rate is indicative of a torpedo threat, and good range-bearing estimates provide good target localization. A linear, towed hydrophone array is used as a receiver, and in many cases the received signals will display high signal-to-noise ratio. It is desirable to detect at ranges greater than the near field range of the array. High-resolution range-bearing estimators have been developed using narrowband signatures and broadband signatures. The range difference to the target across an array causes target signals to display a wave-front curvature. Range estimation is based on wave-front curvature determination using a matched-filtering post beamformer approach. First a target is selected for range estimation in which a subset of beams is chosen for sector inverse beamforming. Curvature pattern replicas over range and bearing are computed and used in a Capon form beamformer. Simulations and experiments with in-water data compare the algorithm performance to a derived benchmark. In addition, a cepstrum-based range rate indicator was demonstrated using experimental data displaying multipath propagation (Lloyd mirror).

关键词： Acoustic signal detection Narrowband Displays Acoustic emission Sonar equipment signal to noise ratio Acoustic beams array signal processing Computational modeling Mirrors

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Transmit Beampattern Design for Dual-Function Radar-Communication System with an Interleaved array

Transmit Beampattern Design for Dual-Function Radar-Communic...

引用

sensor array and multichannel signal processing workshop

作者： Yufeng Chen Guisheng Liao Zhiwei Yang Shengqi Zhu Yongjun Liu Mengchao Jiang National Laboratory of Radar Signal Processing Xidian University Xi’an China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In this paper, a beampattern design method is proposed for the multi-input-multi-output (MIMO) dual-function radar-communication (DFRC) system with an interleaved array. To make full use of the whole aperture, first, the transmit array is partitioned into two interleaved subarrays, one is for radar and the other is for downlink communications. Then, both the radar waveform and communication beamformers are optimized by combining the null-space projection (NSP) method and cyclic approach (CA) to perform the coexistence of MIMO radar and downlink communications. Besides, the communication beampattern can be utilized to improve the detection performance. Finally, several numerical results are given to show the effectiveness of the proposed method.

关键词： array signal processing Design methodology Transmitting antennas signal processing algorithms Radar Apertures Downlink

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array interpolation based on multivariate adaptive regression splines

Array interpolation based on multivariate adaptive regressio...

引用

sensor array and multichannel signal processing workshop

作者： Marco A. M. Marinho João Paulo C. L. da Costa Felix Antreich André L. F. de Almeida Giovanni Del Galdo Edison Pignaton de Freitas Alexey Vinel Department of Electrical Engineering (ENE) University of Brasília (UnB) Fraunhofer Institute for Integrated Circuits IIS Erlangen Germany Institute for Information Technology Ilmenau University of Technology Ilmenau Germany Institute for Communications and Navigation German Aerospace Center (DLR) Department of Teleinformatics Engineering Federal University of Ceará (UFC) Fortaleza Brazil Informatics Institute Federal University of Rio Grande do Sul (UFRGS) IDE Halmstad University Halmstad Sweden

Many important signal processing techniques such as Spatial Smoothing, Forward Backward Averaging and Root-MUSIC, rely on antenna arrays with specific and precise structures. arrays with such ideal structures, such as a centro-hermitian structure, are often hard to build in practice. array interpolation is used to enable the usage of these techniques with imperfect (not having a centro-hermitian structure) arrays. Most interpolation methods rely on methods based on least squares (LS) to map the output of a perfect virtual array based on the real array. In this work, the usage of Multivariate Adaptive Regression Splines (MARS) is proposed instead of the traditional LS to interpolate arrays with responses largely different from the ideal.

关键词： Mars Interpolation Fasteners Linear antenna arrays Direction-of-arrival estimation Estimation

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