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Unnikrishna Pillai

Full Professor Electrical Engineering

1974 …2019
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Research Output 1974 2019

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Article
2014

Dynamic clutter mitigation using sparse optimization

Uysal, F., Selesnick, I., Pillai, U. & Himed, B., 2014, In : IEEE Aerospace and Electronic Systems Magazine. 29, 7, p. 37-49 13 p., 6888958.

Research output: Contribution to journalArticle

wind power
clutter
Wind power
wind farm
mitigation

Waveform diversity for ultra-wide band surveillance radars

Davis, M. E. & Pillai, U., Dec 1 2014, In : IET Radar, Sonar and Navigation. 8, 9, p. 1226-1233 8 p.

Research output: Contribution to journalArticle

Cellular telephone systems
Radar systems
Frequency bands
Radar
Earth (planet)
2008

Cramer-Rao bounds for target parameters in space-based radar applications

Pillai, U., Li, K. Y. & Himed, B., 2008, In : IEEE Transactions on Aerospace and Electronic Systems. 44, 4, p. 1356-1370 15 p.

Research output: Contribution to journalArticle

Cramer-Rao bounds
Earth (planet)
Target tracking
Degradation
Space-based radar
2006

Effect of earth's rotation and range foldover on space-based radar performance

Pillai, U., Himed, B. & Li, K. Y., 2006, In : IEEE Transactions on Aerospace and Electronic Systems. 42, 3, p. 917-931 15 p.

Research output: Contribution to journalArticle

Earth (planet)
Orbits
Space-based radar
Geometry
Processing
2005

The Perron-Frobenius theorem

Pillai, U., Suel, T. & Cha, S., 2005, In : IEEE Signal Processing Magazine. 22, 2, p. 62-75 14 p.

Research output: Contribution to journalArticle

Perron-Frobenius Theorem
Population Growth
Eigenvalues and Eigenvectors
Web Search
Power Control
2002

Full-polarization matched-illumination for target detection and identification

Garren, D. A., Odom, A. C., Osborn, M. K., Goldstein, J. S., Pillai, U. & Guerci, J. R., Jul 2002, In : IEEE Transactions on Aerospace and Electronic Systems. 38, 3, p. 824-837 14 p.

Research output: Contribution to journalArticle

Target tracking
Lighting
Polarization
Frequency response
Radar
2001

Enhanced target detection and identification via optimised radar transmission pulse shape

Garren, D. A., Osborn, M. K., Odom, A. C., Goldstein, J. S., Pillai, U. & Guerci, J. R., Jun 2001, In : IEE Proceedings: Radar, Sonar and Navigation. 148, 3, p. 130-138 9 p.

Research output: Contribution to journalArticle

Target tracking
Radar
Lighting
2000

Generalized forward/backward subaperture smoothing techniques for sample starved STAP

Pillai, U., Kim, Y. L. & Guerci, J. R., Dec 2000, In : IEEE Transactions on Signal Processing. 48, 12, p. 3569-3574 6 p.

Research output: Contribution to journalArticle

Space time adaptive processing
Beamforming
Covariance matrix
Radar

Matched Transmit-Receiver Design in Presence of Signal Dependent Interference

Pillai, U., Oh, H. S., Guerci, J. R. & Youla, D. C., Mar 2000, In : IEEE Transactions on Information Theory. 1T-46, 3, p. 577-584 8 p.

Research output: Contribution to journalArticle

Optimum transmit-receiver design in the presence of signal-dependent interference and channel noise

Pillai, U., Oh, H. S., Youla, D. C. & Guerci, J. R., 2000, In : IEEE Transactions on Information Theory. 46, 2, p. 577-584 8 p.

Research output: Contribution to journalArticle

Impulse response
interference
recipient
simulation
performance
1999

Blind image deconvolution using a robust GCD approach

Pillai, U. & Liang, B., 1999, In : IEEE Transactions on Image Processing. 8, 2, p. 295-301 7 p.

Research output: Contribution to journalArticle

Highest common factor
Deconvolution
Polynomials
Motion pictures
Additive noise
1997

A new study of the problem of compatible impedances

Youla, D. C., Winter, F. & Pillai, U., Nov 1997, In : International Journal of Circuit Theory and Applications. 25, 6, p. 541-560 20 p.

Research output: Contribution to journalArticle

Circuit theory
Impedance
Theorem
Interpolation
Z-matrix
Parameterization
Impulse response
Transfer functions

Wave-oriented signal processing of dispersive time-domain scattering data

Carin, L., Felsen, L. B., Kralj, D. R., Oh, H. S., Lee, W. C. & Pillai, U., 1997, In : IEEE Transactions on Antennas and Propagation. 45, 4, p. 592-600 9 p.

Research output: Contribution to journalArticle

Signal processing
Scattering
Processing
Wavelet transforms
Fourier transforms
1996

Multichannel stable systems that extend the partial impulse response Matrices

Lee Cheol, W. & Pillai, U., 1996, In : IEEE Transactions on Signal Processing. 44, 10, p. 2521-2536 16 p.

Research output: Contribution to journalArticle

Impulse response
Transfer functions
1994

Dispersive modes in the time domain: analysis and time-frequency representation

Carin, L., Felsen, L. B., Kralj, D., Pillai, U. & Lee, W. C., Jan 1994, In : IEEE Microwave and Guided Wave Letters. 4, 1, p. 23-25 3 p.

Research output: Contribution to journalArticle

time domain analysis
Time domain analysis
Processing
Fourier transforms
gratings
1993

A New Technique for ARMA-System Identification and Rational Approximation

Pillai, U. & Shim, T. I., 1993, In : IEEE Transactions on Signal Processing. 41, 3, p. 1281-1304 24 p.

Research output: Contribution to journalArticle

Passive networks
Transfer functions
Identification (control systems)

Block Toeplitz matrix inversion using Levinson polynomials

Lee, W. C. & Pillai, U., Nov 1993, In : IEEE Transactions on Signal Processing. 41, 11

Research output: Contribution to journalArticle

Polynomials

Uniqueness of a two-step predictor based spectral estimator that generalizes the maximum entropy concept

Shim, T. I., Pillai, U. & Lee, W. C., Sep 1993, In : IEEE Transactions on Signal Processing. 41, 9, p. 2942-2946 5 p.

Research output: Contribution to journalArticle

Entropy
Autocorrelation
Mean square error
1992

A new spectrum extension method that maximizes the multistep minimum prediction error--Generalization of the maximum entropy concept

Pillai, U., Shim, T. I. & Benteftifa, M. H., Jan 1992, In : IEEE Transactions on Signal Processing. 40, 1, p. 142-158 17 p.

Research output: Contribution to journalArticle

Autocorrelation
Entropy
Mean square error
Power spectral density
Random processes

Theory and Design of Maximally Flat Low-Pass, High-Pass Reactance-Ladder Diplexers

Youla, D. C., Pillai, U. & Winter, F., May 1992, In : IEEE Transactions on Circuits and Systems. 39, 5, p. 337-350 13 p.

Research output: Contribution to journalArticle

1990

An algorithm for near-optimal placement of sensor elements

Pearson, D., Pillai, U. & Lee, Y., Nov 1990, In : IEEE Transactions on Information Theory. 36, 6, p. 1280-1284 5 p.

Research output: Contribution to journalArticle

Sensors
redundancy
Direction of arrival
Redundancy
ability

Image reconstruction from one bit of phase information

Pillai, U. & Elliott, B., 1990, In : Journal of Visual Communication and Image Representation. 1, 2, p. 153-157 5 p.

Research output: Contribution to journalArticle

Image reconstruction
Discrete Fourier transforms
1989

A self inversive array processing scheme for angle-of-arrival estimation

Kwon, B. H. & Pillai, U., 1989, In : Signal Processing. 17, 3, p. 259-277 19 p.

Research output: Contribution to journalArticle

Array processing
Asymptotic analysis
White noise
Covariance matrix

A uniqueness characterization in terms of signed-magnitude for functions in the polydisc algebra

Youla, D. C. & Pillai, U., Jun 1989, In : Journal of the Optical Society of America. 6, 6, p. 859-862

Research output: Contribution to journalArticle

uniqueness
Algebra
algebra
polynomials
Polynomials

Coherent signal classification using symmetry considerations

Pillai, U. & Lee, Y., Jan 1989, In : IEEE Transactions on Acoustics, Speech, and Signal Processing. 37, 1, p. 135-138 4 p.

Research output: Contribution to journalArticle

Direction of arrival
Eigenvalues and eigenfunctions
Sensors

Forward/backward spatial smoothing techniques for coherent signal identification

Pillai, U. & Kwon, B. H., Jan 1989, In : IEEE Transactions on Acoustics, Speech, and Signal Processing. 37, 1, p. 8-15 8 p.

Research output: Contribution to journalArticle

Covariance matrix
Direction of arrival
Sensors
Asymptotic analysis
White noise
Covariance matrix
Eigenvalues and eigenfunctions
1987
Covariance matrix
Statistical methods
Factorization
Random variables
Maximum likelihood
1985

A MAP Estimate that Maximizes Entropy—An Alternative Interpretation for an Autoregressive Model

Pillai, U., 1985, In : Proceedings of the IEEE. 73, 4, p. 843-844 2 p.

Research output: Contribution to journalArticle

Entropy
Extrapolation
Probability density function
Statistics

NEW APPROACH TO ARRAY GEOMETRY FOR IMPROVED SPATIAL SPECTRUM ESTIMATION.

Pillai, U., Bar-Ness, Y. & Haber, F., Oct 1985, In : Proceedings of the IEEE. 73, 10, p. 1522-1524 3 p.

Research output: Contribution to journalArticle

Geometry
Covariance matrix
1977

Ultimate strength and design of concrete walls

Pillai, U. & Parthasarathy, C. V., 1977, In : Building and Environment. 12, 1, p. 25-29 5 p.

Research output: Contribution to journalArticle

Bearings (structural)
Concretes
design method
reinforcement
Reinforcement
1974

BEAM-COLUMNS OF HOLLOW STRUCTURAL SECTIONS.

Pillai, U., Dec 1974, In : Canadian Journal of Civil Engineering. 1, 2, p. 194-198 5 p.

Research output: Contribution to journalArticle

plastic
Plastics
Specifications