Unnikrishna Pillai

Department of Electrical and Computer Engineering

Polytechnic University

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Journal Publications

S. Unnikrishna Pillai, "A MAP Estimate that Maximizes Entropy - An Alternative Interpretation for an Auto Regressive Model," Proceedings of IEEE, Vol. 73, No. 4, pp. 843-844, April 1985.

S. Unnikrishna Pillai, Y. Bar-Ness and F. Haber, "A New Approach to Array Geometry for Improved Spatial Spectrum Estimation," Proceedings of IEEE, Vol. 73, No. 10, pp. 1522-1524, October 1985.

S. Unnikrishna Pillai and Fred Haber, "Statistical Analysis of a High Resolution Spatial Spectrum Estimator Utilizing an Augmented Covariance Matrix," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-35, No. 11, pp. 1517-1523, November 1987.

S. Unnikrishna Pillai and B. H. Kwon, "Forward/Backward Spatial Smoothing Techniques for Coherent Signal Classification," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 1, pp.8-15, January 1989.

S. Unnikrishna Pillai, and Y. J. Lee, "Coherent Signal Classification Using Symmetry Considerations," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 1, pp. 135-138, January 1989.

Dante C. Youla and S. Unnikrishna Pillai, "A Uniqueness characterization in Terms of Signed-Magnitude for Functions in the Polydisc Algebra," Journal of Optical Society of America, Vol. 6, No. 6, pp. 859-862, June 1989.

B. H. Kwon and S. Unnikrishna Pillai, "A Self Inversive Array Processing Scheme for Angle-of-Arrival Estimation," European Signal Processing Journal, Vol. 17, No. 3, pp. 259-277, July 1989.

S. Unnikrishna Pillai and B. H. Kwon, "Performance Analysis of MUSIC-Type High Resolution Estimators for Direction Finding in Correlated and Coherent Scenes," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 8, pp. 1176-1189, August, 1989.

D. Pearson, S. Unnikrishna Pillai, and Y. J. Lee, "An Algorithm for Near-Optimal Placement of Sensor Elements," IEEE Transactions on Information Theory, Vol. 1T-36, No. 6, pp. 1280-1284, November 1990.

S. Unnikrishna Pillai and Brig Elliott, "Image Reconstruction from one bit of Phase Information," Journal of Visual Communication and Image Representation, Vol. 1, No. 2, pp. 153-157, November 1990.

S. Unnikrishna Pillai, Theodore I. Shim and Hamid Benteftifa, "A New Spectrum Extension Method that Maximizes the Multi-Step Prediction Error-Generalization of the Maximum Entropy Concept," IEEE Transactions on Signal Processing, Vol. 40, No. 1, pp. 142-158, January 1992.

D. C. Youla, S. Unnikrishna Pillai, and F. Winter, "Theory and Design of Maximally Flat Low-Pass, High-Pass Reactance-Ladder Diplexers", IEEE Transactions on Circuits and Systems-I, Vol. 39, No. 5, CAS-I, pp. 337-350, May 1992.

S. Unnikrishna Pillai, T. I. Shim and D. C. Youla, "A New Technique for ARMA-System Identification and Rational Approximation," IEEE Transactions on Signal Processing, Vol. 41, No. 3, pp. 1281-1304, March 1993.

T. I. Shim, S. Unnikrishna Pillai and W. C. Lee, "Uniqueness of a Two-Step Predictor Based Spectral Estimator That Generalizes the Maximum Entropy Concept," IEEE Transactions on Signal Processing, Vol. 41, No. 9, pp. 2942-2946, September 1993.

L. Carin, L. B. Felsen, S. U. Pillai, D. Kralj, and W. C. Lee, "Dispersive Modes in the Time-Domain: Analysis and Time-Frequency Representation," IEEE Microwave and Guided Wave Letters, Vol. 4, No. 1, pp. 23-25, January 1994.

** S. Unnikrishna Pillai, Theodore I. Shim and Won Cheol Lee, "New Signal Processing Methods for the Identification of Minimum-Phase Systems and Rational Approximation of Nonrational Systems", Digital Signal Processing theme Volumes in Control and Dynamic Systems Series, Vol. 65, pp. 253-322, Ed. by C. Leondes, Academic Press, March 1994.

W. C. Lee and S. Unnikrishna Pillai, "Multichannel Stable Systems that Extend the Partial Impulse Response Matrices," IEEE Transactions on Signal Processing, Vol. 44, No. 10, pp. 2521-2536, October 1996.

L. Carin, L. B. Felsen, D. Kralj, H.S. Oh, W. C. Lee and S. U. Pillai, "Wave- Oriented Signal Processing of Dispersive Time-Domain Scattering Data," IEEE Trans. on Antennas and Propagation, Vol. 45, No. 4, pp. 592-600, April, 1997.

S. Unnikrishna Pillai and W. C. Lee, "Parametrization of Stable Systems from Partial Impulse Response Sequences," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, Vol. 44, No.3, pp. 234-242, March 1997.

D. C. Youla, F. Winter and S. Unnikrishna Pillai, "A New Study of the Problem of Compatible Impedences," International Journal of Circuits and Systems, Vol. 25, pp. 541-560, July 1997.

S. Unnikrishna Pillai and Ben Liang, "Blind Image Deconvolution using a Robust GCD Approach," IEEE Transactions on Image Processing, Vol. 8, No. 2, pp. 295-301, February 1999.

S. Unnikrishna Pillai, H.S. Oh, J. R. Guerci and D. C. Youla, "Matched Transmit-Receiver Design in Presence of Signal Dependent Interference," IEEE Trans. on Information Theory, Vol. 1T-46, No. 3, pp. 577-584, March 2000.

S. Unnikrishna Pillai, Y. L. Kim and J. R. Guerci, "Generalized Forward/Backward Subaperture Smoothing Techniques for Sample Starved STAP," IEEE Transactions on Signal Processing, Vol. 48, No. 12, pp. 3569-3574, December 2000.

D. A Garren et. al. (S. U. Pillai), "Full-Polarization Matched-Illumination for Target Detection and Identification," IEEE Trans. on Aerospace and Electronic Systems, Vol. 38, No. 3, pp. 824-837, July 2002.

S. Unnikrishna Pillai, Torsten Suel, and Seunghun Cha, "The Perron-Frobenius Theorem and Some of its Applications," IEEE Signal Processing Magazine, March 2005.

S. U. Pillai et. al. “Effect of Earth’s Rotation and Range Foldover on Space-Based Radar Performance”, Proc. IEEE Transactions on Aerospace and Electronic Systems, Vol. 42, No. 3, July 2006

S. U. Pillai et. al. “Cramer - Rao Bounds for Target Parameters in Space Based Radar Applications” To appear in Proc.IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 4, October 2008.

Back to previous page

	S. Unnikrishna Pillai, "A MAP Estimate that Maximizes Entropy - An Alternative Interpretation for an Auto Regressive Model," Proceedings of IEEE, Vol. 73, No. 4, pp. 843-844, April 1985.
	S. Unnikrishna Pillai, Y. Bar-Ness and F. Haber, "A New Approach to Array Geometry for Improved Spatial Spectrum Estimation," Proceedings of IEEE, Vol. 73, No. 10, pp. 1522-1524, October 1985.
	S. Unnikrishna Pillai and Fred Haber, "Statistical Analysis of a High Resolution Spatial Spectrum Estimator Utilizing an Augmented Covariance Matrix," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-35, No. 11, pp. 1517-1523, November 1987.
	S. Unnikrishna Pillai and B. H. Kwon, "Forward/Backward Spatial Smoothing Techniques for Coherent Signal Classification," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 1, pp.8-15, January 1989.
	S. Unnikrishna Pillai, and Y. J. Lee, "Coherent Signal Classification Using Symmetry Considerations," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 1, pp. 135-138, January 1989.
	Dante C. Youla and S. Unnikrishna Pillai, "A Uniqueness characterization in Terms of Signed-Magnitude for Functions in the Polydisc Algebra," Journal of Optical Society of America, Vol. 6, No. 6, pp. 859-862, June 1989.
	B. H. Kwon and S. Unnikrishna Pillai, "A Self Inversive Array Processing Scheme for Angle-of-Arrival Estimation," European Signal Processing Journal, Vol. 17, No. 3, pp. 259-277, July 1989.
	S. Unnikrishna Pillai and B. H. Kwon, "Performance Analysis of MUSIC-Type High Resolution Estimators for Direction Finding in Correlated and Coherent Scenes," IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-37, No. 8, pp. 1176-1189, August, 1989.
	D. Pearson, S. Unnikrishna Pillai, and Y. J. Lee, "An Algorithm for Near-Optimal Placement of Sensor Elements," IEEE Transactions on Information Theory, Vol. 1T-36, No. 6, pp. 1280-1284, November 1990.
	S. Unnikrishna Pillai and Brig Elliott, "Image Reconstruction from one bit of Phase Information," Journal of Visual Communication and Image Representation, Vol. 1, No. 2, pp. 153-157, November 1990.
	S. Unnikrishna Pillai, Theodore I. Shim and Hamid Benteftifa, "A New Spectrum Extension Method that Maximizes the Multi-Step Prediction Error-Generalization of the Maximum Entropy Concept," IEEE Transactions on Signal Processing, Vol. 40, No. 1, pp. 142-158, January 1992.
	D. C. Youla, S. Unnikrishna Pillai, and F. Winter, "Theory and Design of Maximally Flat Low-Pass, High-Pass Reactance-Ladder Diplexers", IEEE Transactions on Circuits and Systems-I, Vol. 39, No. 5, CAS-I, pp. 337-350, May 1992.
	S. Unnikrishna Pillai, T. I. Shim and D. C. Youla, "A New Technique for ARMA-System Identification and Rational Approximation," IEEE Transactions on Signal Processing, Vol. 41, No. 3, pp. 1281-1304, March 1993.
	T. I. Shim, S. Unnikrishna Pillai and W. C. Lee, "Uniqueness of a Two-Step Predictor Based Spectral Estimator That Generalizes the Maximum Entropy Concept," IEEE Transactions on Signal Processing, Vol. 41, No. 9, pp. 2942-2946, September 1993.
	L. Carin, L. B. Felsen, S. U. Pillai, D. Kralj, and W. C. Lee, "Dispersive Modes in the Time-Domain: Analysis and Time-Frequency Representation," IEEE Microwave and Guided Wave Letters, Vol. 4, No. 1, pp. 23-25, January 1994.
	S. Unnikrishna Pillai, Theodore I. Shim and Won Cheol Lee, "New Signal Processing Methods for the Identification of Minimum-Phase Systems and Rational Approximation of Nonrational Systems"**, Digital Signal Processing theme Volumes in Control and Dynamic Systems Series, Vol. 65, pp. 253-322, Ed. by C. Leondes, Academic Press, March 1994.
	W. C. Lee and S. Unnikrishna Pillai, "Multichannel Stable Systems that Extend the Partial Impulse Response Matrices," IEEE Transactions on Signal Processing, Vol. 44, No. 10, pp. 2521-2536, October 1996.
	L. Carin, L. B. Felsen, D. Kralj, H.S. Oh, W. C. Lee and S. U. Pillai, "Wave- Oriented Signal Processing of Dispersive Time-Domain Scattering Data," IEEE Trans. on Antennas and Propagation, Vol. 45, No. 4, pp. 592-600, April, 1997.
	S. Unnikrishna Pillai and W. C. Lee, "Parametrization of Stable Systems from Partial Impulse Response Sequences," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, Vol. 44, No.3, pp. 234-242, March 1997.
	D. C. Youla, F. Winter and S. Unnikrishna Pillai, "A New Study of the Problem of Compatible Impedences," International Journal of Circuits and Systems, Vol. 25, pp. 541-560, July 1997.
	S. Unnikrishna Pillai and Ben Liang, "Blind Image Deconvolution using a Robust GCD Approach," IEEE Transactions on Image Processing, Vol. 8, No. 2, pp. 295-301, February 1999.
	S. Unnikrishna Pillai, H.S. Oh, J. R. Guerci and D. C. Youla, "Matched Transmit-Receiver Design in Presence of Signal Dependent Interference," IEEE Trans. on Information Theory, Vol. 1T-46, No. 3, pp. 577-584, March 2000.
	S. Unnikrishna Pillai, Y. L. Kim and J. R. Guerci, "Generalized Forward/Backward Subaperture Smoothing Techniques for Sample Starved STAP," IEEE Transactions on Signal Processing, Vol. 48, No. 12, pp. 3569-3574, December 2000.
	D. A Garren et. al. (S. U. Pillai), "Full-Polarization Matched-Illumination for Target Detection and Identification," IEEE Trans. on Aerospace and Electronic Systems, Vol. 38, No. 3, pp. 824-837, July 2002.
	S. Unnikrishna Pillai, Torsten Suel, and Seunghun Cha, "The Perron-Frobenius Theorem and Some of its Applications," IEEE Signal Processing Magazine, March 2005.
	S. U. Pillai et. al. “Effect of Earth’s Rotation and Range Foldover on Space-Based Radar Performance”, Proc. IEEE Transactions on Aerospace and Electronic Systems, Vol. 42, No. 3, July 2006
	S. U. Pillai et. al. “Cramer - Rao Bounds for Target Parameters in Space Based Radar Applications” To appear in Proc.IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 4, October 2008.