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Humboldt-Universität zu Berlin - Mathematisch-Naturwissenschaftliche Fakultät - Institut für Informatik

Probevortrag Promotion: Darko Cvetkovski

Wann 16.06.2021 ab 14:00 (Europe/Berlin / UTC200) iCal
Wo online: Zoom

Am Mittwoch, den 16.06.2021 um 14:00 Uhr s.t. wird der Doktorand Darko Cvetkovski einen Probevortrag zu seiner Promotion halten. Der Titel des Vortrages und seiner Arbeit ist:

"Signal Processing Architectures for Millimeter Wave Line of Sight MIMO Communications”

Der Vortrag wird auf Englisch gehalten. Eine Zoom-Einladung finden Sie hier. (nur mit Infromatik-Account)




With the emergence of next generation cellular networks, novel and flexible wireless backhaul solutions that can provide throughput in the order of 100 Gbit/s are required. Employing spatial multiplexing (MIMO) techniques in combination with large modulation bandwidths, e.g. in the mmWave frequency band, is one viable approach towards meeting this goal. However, there are a plethora of system design challenges that need to be resolved for a practically feasible solution. Conventional MIMO schemes are known to exhibit low rank channel matrices and thus, limited multiplexing gains in line-of-sight (LoS) channels. Furthermore, mmWave wireless channels and hardware-related impairments need to be characterized. From a signal processing perspective, the exponential computational complexity of optimal MIMO detection is prohibitive for its real-time implementation. To this end, the focus of this work is the investigation, design and experimental validation of practically feasible mmWave LoS MIMO systems. Considering the spherical wave propagation model, it can be shown that under specific and optimal antenna arrangements, LoS MIMO channels can achieve a full rank channel matrix and thus support the parallel transmission of multiple streams. Assuming a 60 GHz carrier frequency, the Shannon capacity of such LoS MIMO systems can reach the order of 100 Gbit/s at a link range of 100m, with a moderate number of antennas under realistic transmit power constraints. In this work, the orthogonality of optimally arranged LoS MIMO channels is verified through a series of channel measurements, performed at 60GHz with up to 4x4 antennas in a hardware-in-the-loop setup. The results show that the channel is well conditioned and in good agreement with theory, with a condition number close to one obtained in most cases. Furthermore, from the measured Power Delay Profiles it can be concluded that the mmWave channel is deterministic, with a dominant LoS component and only a few significant NLoS taps. Finally, a scalable receiver architecture is proposed and experimentally verified in this work, providing a highly parallel and lane-based processing of the received MIMO streams. Using sub-optimal and low complexity linear equalization methods, e.g., zero-forcing, it is shown that near-optimal performance can be achieved in the high SNR regime.

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