Ketan Rajawat

• Students interested in working with me should email me their CVs (with a list of relevant courses taken) and schedule a meeting. 
• No summer/winter internship positions are available for non-IITK students. 

• Courses
• EE609: Convex Optimization in SP/COM [2013-2014-2015-2016-2017][Spring'18]
• EE673: Digital Communication Networks [2013-2014-2015-2016]
• ESc201: Introduction to Electronics [2017]

• Research: we focus on the applications of signal processing to communications. See the SPiN lab research page for details. Specific problems of interest include:
  • Online learning with dynamic convex optimization [NCC 2018 tutorial]
  • Localization of wireless sensor networks, design of distributed algorithms
  • Signal processing assisted network monitoring
  • Transceiver optimization, precoder design, beamforming, interference alignment
  • Signal processing for smart grid communications, load scheduling, state estimation
  • Stochastic resource allocation and its applications in wireless networks
  • Spectrum sensing via sparsity and low rank
  • Network coding
  
  
• Education
• University of Minnesota

Ph.D., Electrical and Computer Engineering

Thesis: "Dynamic Optimization and Monitoring in Communication Networks"

Advisor: Prof. Georgios B. Giannakis

• Indian Institute of Technology Kanpur

B.Tech-M.Tech (Dual), Electrical Engineering, Jul. 2007

Thesis: "Symbol Timing Estimation Techniques for MIMO Systems"

Advisor: Prof. Ajit K. Chaturvedi

• Publications
  [Journal]
  
  • A. S. Bedi, P. V. Aditya Prasad, M. W. Ahmad, S. Shinde, K. Rajawat, and S. Anand, "Online Algorithms for Storage Utilization under Real-Time Pricing in Smart Grid," International Journal of Electrical Power and Energy Systems (Elsevier), vol. 101, pp. 50-59, Oct. 2018.
  • J. G. Sreenath, S. Chakrabarti, and K. Rajawat, "Hierarchical Parallel Dynamic Estimator of States for Interconnected Power System," IET Generation, Transmission, and Distribution, 2018.
  • A. S. Bedi and K. Rajawat, "Asynchronous incremental stochastic dual descent algorithm for network resource allocation," IEEE Transactions on Signal Processing, 2018. [arxiv]
  • A. S. Bedi and K. Rajawat, "Network resource allocation via stochastic subgradient descent: convergence rate," IEEE Transactions on Communications, 2018. 
  • Meher Preetam K., S. Mishra, K. Rajawat, and L. Behera, "A hybrid adaptive framework for coordinated control of distributed generators in cyber-physical energy systems," IET Cyber-Physical Systems: Theory and Applications, vol. 3, no. 1, pp. 54-62, Mar. 2018.
  • A. S. Bedi, P. Sarma, and K. Rajawat, "Tracking moving agents via inexact online gradient descent algorithm," IEEE Journal of Selected Topics in Signal Processing - Special issue on Machine Learning for Cognition in Radio Communications and Radar, vol. 12, no. 1, pp. 202-207, Feb. 2018. 
  • J. Akhtar and K. Rajawat, "Distributed sequential estimation in wireless sensor networks,"  IEEE Transactions on Wireless Communications, vol. 17, no. 1, pp. 86-100, Jan. 2018.
  • R. Tripathi, B. Mohan, and K. Rajawat, "Adaptive low rank matrix completion," IEEE Transactions on Signal Processing, vol. 65, no. 14, pp. 3603-3616, July 2017. [Videos]
  • K. Rajawat and S. Kumar, "Stochastic multidimensional scaling," IEEE Transactions on Signal and Information Processing over Networks - Special Issue on Distributed Information Processing in Social Networks, vol. 3, no. 2, pp. 360-375, June 2017. [TrackingVideo][MovieLensVideo][Code] 
  • S. Kumar, R. Jain, and K. Rajawat, "Asynchronous optimization over heterogeneous networks via consensus ADMM," IEEE Transactions on Signal and Information Processing over Networks, vol. 3, no. 1, pp. 114-129, Mar. 2017.
  • S. S. Kalamkar, J. Pradha J, A. Banerjee, and K. Rajawat, "Resource allocation and fairness in wireless powered cooperative cognitive radio networks," IEEE Transactions on Communications, vol. 64, no. 8, pp. 3246-61, Aug. 2016.
  • A. S. Bedi, J. Akhtar, K. Rajawat, and A. K. Jagannatham, "BER-optimized precoders for OFDM systems with insufficient cyclic prefix," IEEE Communication Letters, vol. 20, no. 2, pp 280-283, Feb. 2016.
  • S. Kumar, R. Kumar, and K. Rajawat, "Cooperative localization of mobile networks via velocity-assisted multidimensional scaling," IEEE Transactions on Signal Processing, vol. 64, no. 7, pp. 1744-58, Feb. 2016.
  • G. Kapoor and K. Rajawat, "Outlier-aware cooperative spectrum sensing in cognitive radio networks," Physical Communication (Elsevier), vol. 17, pp. 118-127, Dec. 2015.
  • P. Katiyar and K. Rajawat, "Channel-aware medium access control in multichannel cognitive radio networks," IEEE Communication Letters, vol. 19, no. 10, pp. 1710-13, 2015.
  • P. A. Forero, K. Rajawat, and G. B. Giannakis, “Prediction of partially observed dynamical processes over networks via dictionary learning,” IEEE Transactions on Signal Processing, vol. 62, no. 13, pp. 3305-3320, July 2014.
  • K. Rajawat, E. Dall'Anese, and G. B. Giannakis, “Dynamic network delay cartography,” IEEE Transactions on Information Theory, vol. 60, no. 5, pp. 2910-2920, May 2014. 
  • G. Mateos and K. Rajawat, ''Dynamic network cartography: advances in network health monitoring,'' IEEE Signal Processing Magazine - Special issue on `Adaptation and learning over complex networks,' vol. 30, no. 3, pp. 129-143, May 2013. [Errata]
  • K. Rajawat, A. Cano, and G. B. Giannakis, “Network-compressive coding for wireless sensors with correlated data,” IEEE Transactions on Wireless Communications, vol. 11, no. 12, pp. 4264-4274, Dec. 2012.
  • K. Rajawat and G. B. Giannakis, “Joint scheduling and network coding for multicast in delay-constrained wireless networks,” IEEE Transactions on Signal Processing, vol. 59, no. 12, pp. 6186-6196, Dec. 2011.
  • K. Rajawat, N. Gatsis, S.-J. Kim, and G. B. Giannakis, “Cross-layer design of coded multicast for wireless random access networks,” IEEE Journal on Selected Areas in Communications, vol. 29, no. 10, pp. 1970-1980, Dec. 2011.  
  • K. Rajawat, N. Gatsis, and G. B. Giannakis, “Cross-layer designs in coded wireless fading networks with multicast,” IEEE/ACM Transactions on Networking, vol. 19, no. 5, pp. 1276-1289, Oct. 2011. [most accessed article in Nov. 2011.] 
  • K. Rajawat and A. K. Chaturvedi, “Near optimal training sequences for low complexity symbol timing estimation in MIMO systems,” IEEE Transactions on Communications, vol. 58, no. 1, pp. 281-288, Jan 2010.
  • K. Rajawat and A. K. Chaturvedi, “A low complexity symbol timing estimator for MIMO systems using two samples per symbol,” IEEE Communications Letters, vol. 10, no. 7, pp. 525-527, July 2006.
  [Book chapter]
  • S.-J. Kim, E. Dall'Anese, J. A. Bazerque, K. Rajawat, and G. B. Giannakis, "Advances in spectrum sensing and cross-layer design for cognitive radio networks," in Academic Press Library in Signal Processing: Communications and Radar Signal Processing, vol. 2,  N. D. Sidiropoulos, F. Gini, R. Chellappa, and S. Theodoridis, Eds., Elsevier, 2013.
  [A* conferences (> 9 pages)]
  • A. S. Bedi, K. Rajawat, and M. Coupechoux, "An online approach to D2D trajectory utility maximization problem," in Proc. of the IEEE Intl. Conf. on Computer Communications (INFOCOM), Honolulu, HI, USA, Apr. 2018.
  [Other conferences (< 7 pages)]
  • A. S. Bedi, P. Sarma, and K. Rajawat, "Adversarial Multi-Agent Target Tracking with Inexact Online Gradient Descent," in Proc. of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Calgary, Canada, Apr. 2018. 
  • A. S. Bedi and K. Rajawat, "Wireless network optimization via stochastic sub-gradient descent: rate analysis," in Proc. of the IEEE Wireless Communications and Networking Conf. (WCNC), Barcelona, Spain, Apr. 2018.
  • C. Kumar and K. Rajawat, "Dictionary learning-based fingerprinting for indoor localization," in Proc. of the National Conference on Communications (NCC), Hyderabad, India, Feb. 2018.
  • A. S. Bedi, A. Koppel, and K. Rajawat, "Beyond consensus and synchrony in decentralized online optimization using saddle point method," in Proc. of the Asilomar Conf. on  Signals, Systems, and Computers, Pacific Grove, CA, Nov. 2017. [Asilomar Student Paper Contest Finalist].
  • A. Meghwani, J. G. Sreenath, K. Rajawat, S. Chakrabarti, S. C. Srivastava, “A Recursive State Estimation Approach to Mitigate False Data Injection Attacks in Power Systems,” in IEEE PES General Meeting, Chicago, IL, USA, July, 2017.
  • A. S. Bedi and K. Rajawat, "Asynchronous resource allocation in distributed heterogeneous networks," in Proc. of the IEEE International Conference on Communications (ICC), Paris, France, May 2017. 
  • A. S. Bedi and K. Rajawat, "Optimal utilization of storage systems under real-time pricing," in Proc. of the IEEE ICC Workshop on Integrating Communications, Control, and Computing Technologies for Smart Grid, Paris, France, May 2017.
  • S. Kumar and K. Rajawat, "Distributed asynchronous localization over WSNs via non-convex consensus ADMM," in Proc. of the National Conference on Communications (NCC), Chennai, India, Mar. 2017.
  • S. Kumar and K. Rajawat, "Distributed interference alignment for MIMO cellular network via consensus ADMM," in Proc. of the IEEE GlobalSIP, Washington, DC USA, Dec. 2016
  • J. Akhtar, A. S. Bedi, K. Rajawat, and A. K. Jagannatham, "BER-optimized robust precoder design for MIMO-OFDM systems with Insufficient CP" in Proc. of IEEE Globecom, Washington, DC USA, Dec. 2016. 
  • A. S. Bedi and K. Rajawat, "Online load scheduling under price and demand uncertainty in smart grid," in Proc. of the Intl. Conf. on Signal Processing and Communications (SPCOM), Bangalore, India. June 2016.
  • R. Singh and K. Rajawat, "Online precoder design for parameter tracking in wireless sensor networks," in Proc. of the IEEE Annual Intl. Symp. on Personal, Indoor, and Mobile Radio Commun. (PIMRC), Hong Kong, Aug. 2015.
  • S. Kumar and K. Rajawat, "Velocity assisted multidimensional scaling," in Proc. of the IEEE Intl. Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Stockholm, Sweden, June 2015.
  • G. Kapoor, and K. Rajawat, "Outlier-aware spectrum sensing in cognitive radio networks," in Proc. of the Intl. Conf. on Signal Processing and Communication Systems (ICSPCS), Gold Coast, Australia, Dec., 2014.
  • A. Mishra, A. Pal, K. Rajawat, and A. K. Jagannatham, "Sparse Bayesian learning-based data-aided channel estimation for STTC MIMO systems", in Proc. of the Australasian Telecommunication Networks and Applications Conference (ATNAC), Melbourne, Australia, Nov. 2014.
  • A. Jalan, K. Rajawat, R. M. Hegde, "New encoding schemes for efficient multilingual text messaging,'' in Proc. of the National Conference on Communications (NCC), Kanpur, India, Mar. 2014.
  • K. Rajawat, E. Dall’Anese, and G. B. Giannakis, “Dynamic network kriging,” in Proc. of IEEE Statistical Signal Processing Workshop, Ann Arbor, MI, Aug. 2012.
  • P. A. Forero, K. Rajawat, and G. B. Giannakis, “Semi-supervised dictionary learning for network-wide link load prediction,” in Proc. of Cognitive Information Processing Workshop, Baiona, Spain, May 2012.
  • K. Rajawat, E. Dall’Anese, and G. B. Giannakis, “Joint rate and power control for coded cognitive radio networks,” in Proc. of 45th Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, pp. 259–264, Nov. 2011.
  • K. Rajawat, N. Gatsis, S.-J. Kim, and G. B. Giannakis, “Cross-layer design of coded multicast for wireless random access networks,” in Proc. of Conf. on Information Sciences and Systems (CISS), Baltimore, MD, Mar. 2011.
  • K. Rajawat, N. Gatsis, and G. B. Giannakis, “Cross-layer design of multicast in fading: network coding and asynchronous subgradients,” in Proc. of 3rd IEEE Wireless Network Coding Workshop (SECON Workshops), Boston, MA, June 2010.
  • K. Rajawat and G. B. Giannakis, “Non-random wireless network coding,” in Proc. of 2nd IEEE Wireless Network Coding Workshop (SECON Workshops), Rome, Italy, June 2009. 
  • K. Rajawat, T. Wang, and G. B. Giannakis, “An algebraic polyphase approach to wireless network coding,” in Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Taipei, Taiwan, Apr. 2009.
  • K. Rajawat and A. Banerjee, “Selection relaying at low signal to noise ratios,” Wireless Personal Multimedia Communications (WPMC), Jaipur, Dec, 2007. [arxiv].
  • K. Rajawat and A. K. Chaturvedi, “Non-data aided symbol timing estimation in MIMO systems,” in Proc. of IEEE International Conference on Communications (ICC), Glasgow, Scotland, April 2007.
  • K. Rajawat and A. K. Chaturvedi, "Non-data aided symbol timing estimation in multiple antenna systems," in Proc. of National Conference on Communications (NCC), Kanpur, India, Mar. 2007.
  [Patents]
• IPA No-1857/DEL/2006: A low complexity symbol timing estimator for MIMO systems using two samples per symbol, Patent Grant No. 272223