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Dr. Kiran Kuchi Presents Cloud Radios with Limited Feedback

For this week’s seminar, CESG invited Dr. Kiran Kuchi from IIT Hyderabad to present his research on the use of cloud radios in cellular communication networks. Dr. Kuchi is an Associate Professor in the Department of Electrical Engineering at IIT Hyderabad who specializes in digital communications. Although gains in rates for cellular network users have been significant, other cell interface (OCI) has continued to be the constraint. However, Dr. Kuchi has discovered that reducing the severity of OCI through interference cancellation strategies will inevitably cause an increase in rates.

Dr. Kuchi’s method employs the use of base stations in groups that work together to limit interference in cloud radio networks. Each collection of base stations serves a specific group of user equipment with several streams at the same time. The information coming to and from the central processor (cloud) is coded so that it can be decoded on the receiving end without interference.

This method coupled with a zero forcing equalizer and dirty paper precoding has allowed large increases in allowable rates. When the cloud has all the information available, rates come close to what they would be with no interference at all. Compared to the usual methods, Dr. Kuchi’s method has managed to see mean capacity gains of up to 200%.

Dr. Kuchi is the holder of 12 U.S. patents, with several more pending. His research interests focus on design and analysis of conventional and cloud cellular systems, MIMO systems, equalization/interference suppression techniques, and development of prototypes for next generation communication systems. He received a B.Tech degree in Electronics and Communications Engineering from Sri Venkateswara University College of Engineering Tirupati in 1995. He went on to receive his M.S. and Ph.D. degrees in Electrical Engineering from the University of Texas at Arlington in 1997 and 2006 respectively.