Events Calendar

The Cardinal Role of Scheduling in Multiuser MIMO Downlink Systems

SPEAKER: Mr. Marios Kountouris, Ph.D. Student, Eurecom Institute, France Telecom R&DABSTRACT: The advantages of multiuser MIMO communication unfortunately come at a price. The most substantial cost is perhaps due to the often impractical requirement of perfect channel state information at the transmitter (CSIT). In the first part of the talk, we consider a MISO broadcast channel with partial CSIT and show how smart user scheduling can buy us a lot, allowing the base station to live well even with limited channel knowledge. We present several approaches that exploit power allocation, temporal and spatial correlation, as well as multiuser interference estimation, in order to achieve a significant fraction of the capacity of the full CSIT case by means of multiuser diversity. The second part is concerned with the problem of resource allocation in multicell wireless networks. Network capacity scaling laws are derived in the asymptotic regime where the number of users per cell grows to infinity. Our results suggest that simple distributed resource allocation algorithms can be used, and that multiuser diversity scheduling makes the capacity loss with respect to the optimal resource allocation solution almost negligible.BIO: Marios Kountouris received the Dipl.Ing. in Electrical and Computer Engineering from the National Technical University of Athens, Greece, in 2002, and the M.Sc in Electrical Engineering from Ecole Nationale Supérieure des Télécommunications (E.N.S.T Paris), France, in 2004. From July to October 2004, he interned as research engineer at Samsung Advanced Institute of Technology (S.A.I.T), Korea, working on adaptive MIMO-OFDM transmission, MU-MIMO precoding and scheduling, as well as being actively involved in the standardization activities for 3GPP (PU2RC) and IEEE 802.16e. From November 2004, he is pursuing his Ph.D at the Mobile Communications Dept. of Eurecom Institute, under Prof. David Gesbert and funded by France Telecom R&D. His current interests are in the field of communication and information theory with particular focus on multiuser MIMO systems and resource allocation for wireless networks.Host: Giuseppe Caire, caire@usc.edu

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248

Audiences: Everyone Is Invited

Contact: Mayumi Thrasher