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Adv Networks Colloq: Gabor Fodor, Performance of multiuser multiple input multiple output systems
Wednesday, May 23, 2018
11:00 a.m.
2168 AV Williams Building
For More Information:
Kim Edwards
kedwards@umd.edu

When Subtleties Matter: Tuning the Receiver Structure and the Pilot-to-Data Power Ratio in Multiuser Multiple Input Multiple Output Systems

Gabor Fodor
Master Researcher
Ericsson Research, and
Adjunct Professor
Royal Institute of Technology (KTH), Sweden

Abstract
The performance of multiuser multiple input multiple output (MIMO) systems critically depends on the quality of the acquired channel state information and the structure of the receiver at the base station. Previous works proposed base station receivers that minimize the mean squared error of the received data symbols. Unfortunately, the previously proposed schemes do not minimize the mean squared error in the presence of channel estimation errors, and typically do not utilize the instantaneous channel estimates of all users of the multiuser MIMO system. In this talk I develop a receiver that utilizes the instantaneous channel estimates – whose quality depends on the pilot-to-data power ratio – of all users and show that the new receiver outperforms the previously proposed covariance-based multiuser MIMO receiver structures. Interestingly, under some mild assumptions, when mobile stations tune their respective pilot-to-data power ratios, the system converges to a Nash equilibrium.

Biography
Gábor Fodor (SM’08) received the Ph.D. degree in teletraffic theory from the Budapest University of Technology and Economics in 1998. Since 1998, he has been with Ericsson Research, Kista, Sweden. He is currently a Master Researcher specializing in modeling, performance analysis and protocol development for wireless access networks. He is also an Adjunct Professor with the Department of Automatic Control, KTH Royal Institute of Technology, Stockholm, Sweden. He has co-authored over 80 papers in reviewed conference proceedings and journals and holds over 80 patents (granted or pending). He was one of the chairs and organizers of the IEEE Broadband Wireless Access Workshop Series from 2007 to 2013. He was a corecipient of the Stephen O. Rice prize in 2018.

This Event is For: Graduate • Undergraduate • Faculty • Post-Docs

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