Network MIMO with CSI Imperfectly Shared between the TXs

Speakers: 
Paul de Kerret, EURECOM, France
Date: 
Monday, February 18, 2013 - 14:30 to 15:30
Location: 
Council room of L2S (room B4.40), Supélec, campus of Gif-sur-Yvette, Supélec.

Abstract: Over the last couple of years, letting the TXs jointly serve their users to form a so-called "Network MIMO" has appeared as a promizing method to manage interference. Yet, this cooperation comes at the expense of acquiring accurate channel state information (CSI) between the TXs, which becomes quickly unpractical as the size of the network increases.

Addressing the problem of "Who needs to know what" when it comes to CSI, 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.

Optimizing the CSI sharing leads to each TX having its own CSI version. Consequently, we turn to the challenging problem of precoding with TXs having different CSI estimates. We show how conventional ZF heavily suffers from the unequal quality of CSI among the TXs and we propose new precoding schemes improving over ZF.

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.

The presentation will be broadcasted on XiMinds.