CSI Sharing Strategies in Wireless Networks

Paul De Kerret

EURECOM
Mobile Communications Department
CS 50193
F-06904 Sophia Antipolis cedex

Abstract:

Over the last couple of years, multiple-antenna based transmitter (TX) cooperation has been shown to be an important tool in controlling, avoiding or rejecting interference resulting from aggressive spectral reuse. In this talk, we highlight the price paid in the form of exchanging channel state information (CSI) between the TXs in most collaborative methods and how to circumvent this problem so as to make TX cooperation both more practical and scalable for future dense networks. We address the problem of ”Who needs to know what” when it comes to CSI, in scenarios encompassing interference channels without user message sharing as well as Network MIMO with message sharing.

For the first scenario, where interference alignment strategies have been recently advocated, we establish conditions under which CSI can be partially shared to the TXs while reaching the same asymptotic performance as a scenario with full CSI sharing. When it comes to the Network MIMO scenario, we investigate ways of exploiting path loss power decay in order to limit CSI sharing between the TXs while maintaining the same performance as a fully cooperative network. We show that such CSI dissemination strategies can substantially alleviate some of the overhead related to multiple-antenna cooperation.

Biography:

Paul de Kerret (IEEE Student Member) was born in 1987 in Paris, France.

In 2009, he graduated from Ecole Nationale Superieure des Telecommunications de Bretagne, France and obtained a diploma degree in electrical engineering from Munich University of Technology (TUM), Germany. He also earned a four year degree in mathematics at the Universite de Bretagne Occidentale, France in 2008. From january 2010 to september 2010, he has been a research assistant at the Institute for Theoretical Information Technology, RWTH Aachen University, Germany.

Since October 2010, he is working toward a Ph.D. degree under the supervision of David Gesbert in the Mobile Communications Department at EURECOM, France.

The main focus of his current work is on the design and the analysis of distributed cooperation schemes between transmitters in wireless networks. His research interests include signal processing in wireless networks, multiuser MIMO systems and multi-user information theory.