| Competitive Mean-Squared Error Beamforming |
20 DEC 2004 |
10 pages |
| Authors:
Yonina C. Eldar; Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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 | We consider the problem of designing a linear beamformer to estimate a source signal s(t) from array observations. Conventional beamforming methods typically aim at maximizing the signal-to-interference-plus-noise ratio (SINR). However this does not guarantee a small mean-squared error (MSE), hence on average their resulting signal estimate ^s(t) can be far from s(t). To ensure that ^s(t) is close to s(t), we propose using the more appropriate design criterion of MSE. ... |
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| Antenna Array Methods for Communications, Direction Estimation, and GPS |
25 FEB 2003 |
18 pages |
| Authors:
Arya Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We developed a unified statistical framework for deriving signal processing methods. In electromagentics we developed methods for source tracking using an EM vector- sensor antenna; we designed such an antenna of compact shape. In radar we derived Cram/'er-Rao bounds for estimating a target range, velocity, and direction; developed a novel parametric approach for estimating and mitigating interferences in STAP. In communications we considered space-time fading channel estimation and symbol detection ... |
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| Interference Estimation and Mitigation for STAP Using the Two- Dimensional Wold Decomposition Parametric Model |
14 MAR 2001 |
19 pages |
| Authors:
Joseph M. Francos; Wenyin Fu; Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The goal of space-time adaptive processing (STAP) is to manipulate the available data to achieve high gain at the target angle and Doppler and maximal mitigation along both the jamming and clutter lines. Because the interference covariance matrix is unknown a priori, it is typically estimated using sample covariances obtained from averaging over a few range gates. The authors propose a new approach for parametric modeling and estimation of STAP ... |
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| Interference Estimation and Mitigation for Stap Using the Two- Dimensional Wold Decomposition Parametric Model |
2000 |
6 pages |
| Authors:
Joseph M. Francos; Wenyin Fu; Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We develop parametric modeling and estimation methods for STAP data based on the results of the 2-D Wold-like decomposition. We show that the same parametric model that results from the 2-D Wold-like orthogonal decomposition naturally arises as the physical model in the problem of space-time processing of airborne radar data. We exploit this correspondence to derive computationally efficient parametric fully adaptive and partially adaptive detection algorithms. Having estimated the parametric ... |
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| Retrieval from Video and Pictorial Databases Employing Similarity and Motion |
01 NOV 1999 |
8 pages |
| Authors:
Jezekiel Ben-Arie; A. P. Sistla; Clement Yu; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| This project focuses on research towards the development of a system for similarity based retrieval from video and pictorial databases. The specific aims of the work are development of an image understanding system for detecting humans in videos, development of an expressive query language called Hierarchical Temporal Logic (HTL), for spatio-temporal queries on video databases and an initial development of activity recognition module that tracks and recognizes human actions in ... |
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| A Framework for the Certification and Evaluation of Real-Time Safety- Critical Intelligent Systems |
JAN 1999 |
22 pages |
| Authors:
Jeffrey J. Tsai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The concept of software architecture has recently emerged as a new way to improve our ability to effectively construct large scale software systems. However, there is no formal architecture specification language available to model and analyze temporal properties of complex real-time systems. In this paper, an object-oriented logic-based architecture specification language for real-time systems is discussed. Representation of the temporal properties and timing constraints, and their integration with the language ... |
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| Battlefield Target Localization Using Acoustic Vector Sensors and Distributed Processing |
1999 |
19 pages |
| Authors:
Malcolm Hawkes; Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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Reports by Corporate Author
