Graduate School and Research Center in Digital Sciences

Seminar: Massive MIMO for next generation wireless systems

Erik G. Larsson, Linköping University, Sweden

Communication systems

Date: May 13, 2013

Abstract: Massive MIMO (also known as ``Large-Scale Antenna Systems'', ``Very Large MIMO'', ``Hyper MIMO'') makes a clean break with current practice through the use of a large excess of service-antennas over active terminals and TDD operation. Extra antennas help by focusing energy into ever-smaller regions of space to bring huge improvements in throughput and radiated energy efficiency. Other benefits of massive MIMO include the extensive use of inexpensive low-power components, reduced latency, simplification of the MAC layer, and robustness to intentional jamming. The anticipated throughputs depend on the propagation environment providing asymptotically orthogonal channels to the terminals, but so far experiments have not disclosed any limitations in this regard. While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly-joined terminals, the exploitation of extra degrees of freedom provided by the excess of service-antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios. This mini-tutorial will present an overview of the massive MIMO concept and of some contemporary research on the topic. Biography: Erik G. Larsson is Professor and Head of the Division for Communication Systems in the Department of Electrical Engineering (ISY) at Linkoping University (LiU) in Linkoping, Sweden. He joined LiU in September 2007. He has previously held positions at the Royal Institute of Technology (KTH) in Stockholm, University of Florida, George Washington University (USA), and Ericsson Research (Stockholm). He received his Ph.D. from Uppsala University in 2002. His main professional interests are within the areas of wireless communications and signal processing. He has published some 90 journal papers on these topics, he is co-author of the textbook Space-Time Block Coding for Wireless Communications (Cambridge Univ. Press, 2003) and he holds 10 patents on wireless technology. He is Associate Editor for the IEEE Transactions on Communications and he has previously been Associate Editor for several other IEEE journals. He is a member of the IEEE Signal Processing Society SPCOM technical committee. He is active in conference organization, most recently as the Technical Chair of the Asilomar Conference on Signals, Systems and Computers 2012 and Technical Program co-chair of the International Symposium on Turbo Codes and Iterative Information Processing 2012. He received the IEEE Signal Processing Magazine Best Column Award 2012.

Massive MIMO for next generation wireless systems

Massive MIMO for next generation wireless systems