My current research activities are focused on advances in several fields of rapid technology development, notably wireless networks, social networks and smart grid. The dramatic increase in demand for new capacity and higher performance has been a major issue in the design and deployment of contemporary wireless networks. The development of these capabilities is severely limited by the scarcity of two of the principal resources in wireless networks: energy and bandwidth. Emerging generations of wireless standards are addressing these issues through the use of technique such as cooperative communications and spectrum sharing. One focus of our recent work in wireless networks has addressed the fundamental limits of such techniques through the information theoretic analyses of relay and interference channels. A further issue that we are addressing is the fundamental ability of the physics of the radio channel to provide security in data transmission, and the development of codes and other methods to exploit this capability. In the area of social networks, our focus has been on two areas of interest. The first is the development of new models and analytical techniques for studying the degrees of social separation in small-world networks, and the application of such models to aid in the understanding of social phenomena that have been observed in experimental studies of social networks. The second area of interest has been the development of an on-line content trading platform, and the use of this platform as an experimental test-bed to investigate the behavior of users in various types of content sharing and content trading scenarios. Smart grid has emerged as a key technology for improving the efficiency, efficacy and security of the distribution and consumption of electric power, and particularly for the integration of renewable energy sources such as wind and solar power, into the electricity grid. Our work in this area has focused on the use of advanced methods from communications and information technology to address several issues arising in this context, including the detection and amelioration of bad data attacks, the study of privacy issues for both operators and consumers, and development of distributed algorithms for state estimation and control of the grid. Preprints of my recent and forthcoming publications describing this research can be found on the ArXiv website . Other publications describing recent research progress in related areas can be found there as well.
"Principles of Cognitive Radio." With E. Biglieri, et al. (Cambridge University Press, 2013)
"Self-Organization in Dense Small Cells: A Reinforcement Learning Approach," (with M. Bennis, et al.). IEEE Transactions on Wireless Communications, to appear.
"A General Framework of Precoding Design for Multiple Two-way Relaying Communications," (with Z. Ding). IEEE Transactions on Signal Processing 61 (6) 1531 – 1535, March 15, 2013.
"A Game-Theoretic Approach for Energy-Efficient Contention-Based Synchronization in OFDMA Systems," (with G. Bacci, et al.). IEEE Transactions on Signal Processing 61 (5) 1258 - 1271, March 1, 2013.
"Delay of Social Search on Small-World Random Geometric Graphs," (with H. Inaltekin and M. Chiang). Journal of Mathematical Sociology, to appear.
"From Technological Networks to Social Networks," (with K.-C. Chen and M. Chiang). IEEE Journal on Selected Areas in Communications, to appear.
"How Do Local and Global Decision Makers Interact? Bayesian Games and Social Learning," (with V. Krishnamurthy). IEEE Signal Processing Magazine 30 (3) 43 – 57, May 2013.
"Fundamental Limits of Network Community Detection: Theory, Algorithms, and Applications," (with P. Wolfe, et al.). Proceedings of the XXXIII Sunbelt Social Networks Conference of the International Network for Social Network Analysis, Hamburg, Germany, May 21 – 26, 2013.
"Smart Grid Communications and Networking." Edited, with E. Hossain and Z. Han. (Cambridge University Press, 2012).
"Sparse Attack Construction and State Estimation in the Smart Grid: Centralized and Distributed Models," (with M. Ozay, et al.). IEEE Journal on Selected Areas in Communications: Smart Grid Communications 31 (7) July 2013, to appear.
"Energy Imbalance Management Using a Robust Pricing Scheme," (with W. Chiu and H. Sun). IEEE Transactions on Smart Grid 4 (2) 896 – 904, June 2013.
"Economics of Electric Vehicle Charging: A Game Theoretic Approach," (with W . Tushar, et al. ). IEEE Transactions on Smart Grid 3 (4) 1767 – 1778, December 2012.
"Smart Meter Privacy: A Theoretical Framework," (with L. Sankar, et al. ). IEEE Transactions on Smart Grid, 4 (2) 837 – 846, June 2013.
"Capacity and Security of Heterogeneous Distributed Storage Systems," (with T. Ernvall, et al.). Proceedings of the 2013 IEEE International Symposium on Information Theory, Istanbul, Turkey, July 7 - 12, 2013.
"Utility-Privacy Tradeoffs in Databases: An Information-theoretic Approach," (with L. Sankar and S. Rajagopalan). IEEE Transactions on Information Forensics and Security 8 (6) 838 - 852, June 2013.
"On Energy-Secrecy Tradeoffs for Gaussian Wire-tap Channels," (with C. Comaniciu). IEEE Transactions on Information Forensics and Security 8 (2) 314 – 323, February 2013.
"Cooperative Wireless Cellular Systems: An Information Theoretic View." With O. Simeone, et al. (Now, 2012).
"Heegard-Berger and Cascade Source Coding Problems with Common Reconstruction Constraints," (with R. Tandon, et al.). IEEE Transactions on Information Theory 59 (3) 1458 - 1474, March 2013.
"New Results on Multiple-Input Multiple-Output Broadcast Channels with Confidential Messages," (with R. Liu, et al.). IEEE Transactions on Information Theory 59 (3) 1346 – 1359, March 2013.
"The Multi-way Relay Channel," (with D. Gündüz, et al. ). IEEE Transactions on Information Theory 59 (1) 51 – 63, January 2013.
"Classical, Semi-Classical and Quantum Noise." Edited, with L. Cohen and M. Scully. (Springer-Verlag, 2012).
"Distributed Linear Parameter Estimation: Asymptotically Efficient Adaptive Strategies," (with S. Kar and J. Moura). SIAM Journal on Optimization and Control, to appear.
"A Sequential Predictor Retraining Algorithm and its Application to Market Prediction," (invited, with H. Zheng and S. Kulkarni). Annals of Operations Research, to appear.
"QD-Learning: A Collaborative Distributed Strategy for Multi-Agent Reinforcement Learning Through Consensus + Innovations," (with S. Kar and J. Moura). IEEE Transactions on Signal Processing 61 (7) 1848 – 1862, April 1, 2013.
"System and Method for Initial Ranging in Wireless Communication Systems,'' (with M. Morelli and L. Sanguinetti). U. S. Patent No. 8,254,242. Issued August 28, 2012.
"System and Method for Blind Estimation of Multiple Carrier Frequency Offsets and Separation of User Signals in Wireless Communication Systems," (with V. Koivunen, et al.). U. S. Patent No. 7,929,937. Issued April 19, 2011.
“Method and Apparatus for Regenerative Based Interference Cancellation Within a Communication System,” (with A. Flaig, et al.). U. S. Patent No. 7,697,594. Issued April 13, 2010. [Assigned to Texas Instruments.]
“Methods and Systems for Using Pulsed Radar for Communications Transparent to Radar Function,” (with D. Meyers, et al.). U. S. Patent No. 7486,221. Issued February 3, 2009. [Assigned to Honeywell.]