Dear Colleague,

On behalf of the IEEE Sweden VT/COM/IT Chapter in collaboration with Chalmers University of Technology, we would like to invite you to the following IEEE Technical online seminar by Professor Erik G. Larsson, Linköping University, Sweden.

Title: Three Things that Matter in (Distributed) MIMO

Time: 14:00-15:00 CET Fri Mar 1, 2024

Online Zoom: https://chalmers.zoom.us/j/61817885773?pwd=eFo4ektnMnZKQ2VxbnpjeHAxTk94QT09 Password: 292995 (alternative connections below).

Local host: Prof. Henk Wymeersch, Chalmers University of Technology, Gothenburg, Sweden, henkw@chalmers.se.

Abstract: I will talk about different sources of phase errors in (distributed) MIMO: channel aging, reciprocity errors, and LO phase drift (noise), and how they can be mitigated. Specifically I will explain different types of phase synchronization that is required in D-MIMO systems, how synchronization can be accomplished using over-the-air measurements, and discuss some common misconceptions around this problem. I will then discuss scalabiilty aspects of over-the-air synchronization for large D-MIMO systems, and show how this problem can be analyzed using tools from spectral graph theory. Finally I will briefly discuss the role of synchronization and phase coherency (and phase noise) for a "sibling" application: over-the-air data aggregation in edge intelligence, relying on transmitter channel phase reversal for uplink data to superimpose constructively at a base station receiver.

Biography: Erik G. Larsson is Professor at Linköping University, Sweden.  He co-authored Fundamentals of Massive MIMO (Cambridge, 2016, and Space-Time Block Coding for Wireless Communications (Cambridge, 2003).  Recent service includes membership of the IEEE Signal Processing Society Awards Board (2017--2019), the IEEE Signal Processing Magazine editorial board (2018--2021), and the IEEE Transactions on Wireless  Communications steering committee (2019--2022).  He received, among others, the IEEE ComSoc Stephen O. Rice Prize in Communications Theory 2015, the IEEE ComSoc Leonard G. Abraham Prize 2017, the IEEE ComSoc Best Tutorial Paper Award 2018, the IEEE ComSoc Fred W. Ellersick Prize in 2019, and the IEEE SPS Donald G. Fink Overview Paper Award 2023. He is a member of the Swedish Royal Academy of Sciences (KVA), a Fellow of the IEEE, and a co-host of the Wireless Future podcast.

Welcome!

Best regards,
Tommy Svensson, IEEE VT/COM/IT Sweden Chapter

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