Publications and Patents

Lalitha Sankar

Science and Technology Postdoctoral Fellow
C-436, Engineering Quadrangle, Olden Street,
Princeton, NJ 08544,
Phone: 609-258-2509
Email: lalitha at princeton dot edu

Publications

Journals/Preprints

L. Sankar, X. Shang, E. Erkip, and H. V. Poor, Ergodic Fading Two-user Interference Channels: Sum-Capacity and Separability, submitted to IEEE Trans. Information Theory, Jun. 2009.
L. Sankar, Y. Liang, N. B. Mandayam, and H. V. Poor, “Opportunistic communications in fading Gaussian multiaccess relay channels,” submitted to IEEE Trans. Information Theory, Feb. 2009.
L. Sankar, G. Kramer, and N. B. Mandayam, User. vs. Relay Cooperation in Time-duplexed Multiaccess Networks, under revision, IEEE Transactions on Wireless Communication, August 2008.
V. Aggarwal, L. Sankar, A. R. Calderbank, and H. V. Poor, “Secrecy capacity of a class of orthogonal relay eavesdropper channels,” EURASIP Journal on Wireless Communication and Networking: Special Issue on Wireless Physical Layer Security, Jun. 2009.
L. Sankar, N. B. Mandayam, and H. V. Poor, On the Sum-capacity of Degraded Gaussian Multiaccess Relay Channels, accepted, IEEE Transactions on Information Theory, August 2009.
S. Mathur, L. Sankar, and N. B. Mandayam, Coalitions in Cooperative Wireless Networks, IEEE Journal on Special Areas in Communication, Special Issue on Game Theory in Communication Networks, vol. 26, no. 7, pp. 1104-1115, Sep. 2008.
L. Sankar, G. Kramer, and N. B. Mandayam, Decode-and-Forward with Offset Encoding for Multiaccess Relay Channels , IEEE Trans. Information Theory: Special Issue on Models, Theory, and Codes for Relaying and Cooperation in Communication Networks, vol.53, no. 10, pp. 3814-3821, Oct. 2007.

Conference Papers

V. Aggarwal, L. Sankar, A. R. Calderbank, and H. V. Poor. “ Secrecy capacity of a class of orthogonal relay eavesdropper channels,” Proc. of the 3rd Annual Information Theory and Applications Workshop, La Jolla, CA, Feb. 8-13, 2009 (invited).
V. Aggarwal, L. Sankar, A. R. Calderbank, and H. V. Poor. “ Secrecy capacity of a class of orthogonal relay eavesdropper channels,” submitted to the IEEE Symposium on Information Theory (ISIT), Jan. 2009.
L. Sankar, X. Shang, E. Erkip, and H. V. Poor, Ergodic Two-user Interference Channels: Is Separability Optimal?, 46th Annual Allerton Conf. on Comm., Control, and Computing, Monticello, IL, Sept. 24-26, 2008.
L. Sankar, E. Erkip, and H. V. Poor, Sum-capacity of ergodic fading Interference and Compound Multiaccess Channels, IEEE International. Symposium on Information Theory, July 7-11, Toronto, CA.
S. Mathur, L. Sankar, and N. B. Mandayam, Coalitions in Cooperative Networks, 3^rd Information Theory and Applications Workshop, San Diego, CA, Jan.28- Feb 1, 2008 (invited).
S. Mathur, L. Sankaranarayanan, and N. B. Mandayam. “Coalitional games in cooperative radio networks,” Proc. of 40th Annual Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, Oct. 29-Nov. 1, 2006.
S. Mathur, L. Sankaranarayanan, and N. B. Mandayam. “Coalitional games in Gaussian interference channels,” Proc. of IEEE International Symposium on Information Theory, Seattle, WA, Jul. 9-14, 2006.
S. Mathur, L. Sankaranarayanan, and N. B. Mandayam. “Coalitional games in receiver cooperation for spectrum sharing,” Proc. of 40th Annual Conference on Information Sciences and Systems, Princeton, NJ, Jul. 9-14, 2006
L. Sankar, G. Kramer, and N. B. Mandayam, User vs. Relay Cooperation in Multiaccess Networks, 45th Annual Allerton Conf. on Comm., Control, and Computing, Monticello, IL, Sept. 28-30, 2007.
L. Sankar, Y. Liang, H. V. Poor, and N. B. Mandayam, Opportunistic Communications in an Orthogonal Multiaccess Relay Channel, IEEE International Symposium on Information Theory, Nice, France, June 24-29, 2007.
L. Sankar, G. Kramer, and N. B. Mandayam, Sum-capacity of Degraded Gaussian Multiaccess Relay Channels, 2^nd Information Theory and Applications Workshop, San Diego, CA, Jan.28- Feb 1, 2007 (invited).
S. Mathur, L. Sankaranarayanan, N. B. Mandayam, Coalitional Games in Gaussian Inteference Channels, IEEE International Symposium on Information Theory, Seattle, Washington, Jul. 9-15, 2006.
S. Mathur, L. Sankaranarayanan, N. B. Mandayam, Coalitional Games in Receiver Cooperation for Spectrum Sharing, 40th Annual Conference on Information Sciences and Systems (CISS), Princeton, NJ, Mar 22-24, 2006.
L. Sankaranarayanan, G. Kramer, N. B. Mandayam, Cooperative Diversity in Wireless Networks: A geometry-inclusive analysis, 43rd Annual Allerton Conf. on Comm., Control, and Computing, Monticello, IL, Sept. 28-30, 2005.
L. Sankaranarayanan, G. Kramer, N. B. Mandayam, Cooperation vs. Hierarchy: An Information-theoretic Comparison, 2005 Intl. Symposium on Information Theory, Adelaide, Australia, Sept. 4-9, 2005 .
L. Sankaranarayanan, G. Kramer, N. B. Mandayam, Hierarchical Wireless Networks: Capacity Bounds using the Constrained Multiple-Access Relay Channel Model, 38th Annual Asilomar Conference on Signals, Systems, and Computers, Asilomar, CA, Nov. 7-10, 2004.
L. Sankaranarayanan, G. Kramer, N. B. Mandayam, Hierarchical Sensor Networks: Capacity Theorems and Cooperative Strategies using the Multiple-Access Relay Channel Model, IEEE 1st Annual Conference on Sensor Networks, Santa Clara, California, October 4-7, 2004.
L. Sankaranarayanan, G. Kramer, N. B. Mandayam, Capacity theorems for the Multiple-Access Relay Channel, 42nd Annual Allerton Conference on Communication, Control, and Computing, Allerton, IL, Sept. 29-Oct 1, 2004.
R. H. Erving, L. Sankaranarayanan, Combining channel codes for data rate maximization in DMT-based DSL systems, CISS 2002, Princeton, NJ.
J. M. Morris, S. Balasubramanian, M. Guo, L. Sankaranarayanan, A detection algorithm for gaseous pollutants using signal processing techniques on FTIR interferograms, SPIE Proceedings, November 1994.

Doctoral Dissertation

        L. Sankar, Relay Cooperation in Multi-access Networks, WINLAB, Rutgers University, North Brunswick, NJ.
        Thesis Supervisor: Narayan Mandayam. Defended: May 2007.
        (Please refer to recent journal papers for final results on chapters 4 and 5 and the appropriate Appendices).

Patents

L. Sankaranarayanan and R. Sonalkar, Method and apparatus for allocating data for transmission via discrete multiple tones, U.S. patent granted October 2000.
R. H. Erving and L. Sankaranarayanan, Efficient reduced complexity windowed time domain equalizer for discrete multitone-based DSL modem, U.S. patent granted .June 2006.
R. H. Erving and L. Sankaranarayanan, Multi-frequency data transmission channel power allocation, U.S. patent granted July 2006.