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Dipl.-Ing. Thomas Kühne

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Thomas Kühne is a Phd student at the CommIT chair and holds a university degree (5-year Dipl.-Ing. equivalent to a M.Sc.) from the University of Technology Dresden. He has already gained professional research experience while working 3 years for the Fraunhofer Heinrich-Hertz-Institute in Berlin Germany. At the  Heinrich-Hertz-Institute he focused on developing prototypes for mm-wave communication and measurement devices for mm-wave channels. Thus he is experienced in hardware and signal-processing design for complex systems with high data rates.

Since 2015 he works for the Communications and Information Theory Group of Prof. Caire and is also working towards his own PhD degree. At the Technische Universität Berlin he is part of a team developing an innovative Massive MIMO platform. This platform can be used to investigate different aspects of systems with large number of antennas like hybrid analog/digital signal processing for multi-user-MIMO, efficient signal processing for zero-forcing precoding and more.

Publications

Fully-/Partially-Connected Hybrid Beamforming Architectures for mmWave MU-MIMO
Citation key song2020fully
Author Song, Xiaoshen and Kühne, Thomas and Caire, Giuseppe
Pages 1754-1769
Year 2020
ISSN 1558-2248
DOI 10.1109/TWC.2019.2957227
Journal IEEE Transactions on Wireless Communications
Volume 19
Number 3
Publisher IEEE
Abstract Hybrid digital analog (HDA) beamforming has attracted considerable attention in practical implementation of millimeter wave (mmWave) multiuser multiple-input multiple-output (MU-MIMO) systems due to the low power consumption with respect to its fully digital baseband counterpart. The implementation cost, performance, and power efficiency of HDA beamforming depends on the level of connectivity and reconfigurability of the analog beamforming network. In this paper, we investigate the performance of two typical architectures that can be regarded as extreme cases, namely, the fully-connected (FC) and the one-stream-per-subarray (OSPS) architectures. In the FC architecture each RF antenna port is connected to all antenna elements of the array, while in the OSPS architecture the RF antenna ports are connected to disjoint subarrays. We jointly consider the initial beam acquisition and data communication phases, such that the latter takes place by using the beam direction information obtained by the former. We use the state-of-the-art beam alignment (BA) scheme previously proposed by the authors and consider a family of MU-MIMO precoding schemes well adapted to the beam information extracted from the BA phase. We also evaluate the power efficiency of the two HDA architectures taking into account the power dissipation at different hardware components as well as the power backoff under typical power amplifier constraints. Numerical results show that the two architectures achieve similar sum spectral efficiency, while the OSPS architecture is advantageous with respect to the FC case in terms of hardware complexity and power efficiency, at the sole cost of a slightly longer BA time-to-acquisition due to its reduced beam angle resolution.
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Dipl-Ing. Thomas Kühne
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