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Sub-Terahertz MIMO Spatial Multiplexing in Indoor Propagation Environments

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Title: Sub-Terahertz MIMO Spatial Multiplexing in Indoor Propagation Environments
Authors: Ogawa, Yasutaka Browse this author →KAKEN DB
Utsuno, Taichi Browse this author
Nishimura, Toshihiko Browse this author →KAKEN DB
Ohgane, Takeo Browse this author →KAKEN DB
Sato, Takanori Browse this author
Keywords: 6G
sub-Terahertz band
hybrid MIMO system
spatial multi-plexing
channel capacity
beam steering
Issue Date: 1-Oct-2022
Publisher: IEICE - Institute of the Electronics, Information and Communication Engineers
Journal Title: IEICE transactions on communications
Volume: E105B
Issue: 10
Start Page: 1130
End Page: 1138
Publisher DOI: 10.1587/transcom.2021MEI0004
Abstract: A sub-Terahertz band is envisioned to play a great role in 6G to achieve extreme high data-rate communication. In addition to very wide band transmission, we need spatial multiplexing using a hybrid MIMO system. A recently presented paper, however, reveals that the number of observed multipath components in a sub-Terahertz band is very few in indoor environments. A channel with few multipath components is called sparse. The number of layers (streams), i.e. multiplexing gain in a MIMO system does not exceed the number of multipaths. The sparsity may restrict the spatial multiplexing gain of sub-Terahertz systems, and the poor multiplexing gain may limit the data rate of communication systems. This paper describes fundamental considerations on sub-Terahertz MIMO spatial multiplexing in indoor environments. We examined how we should steer analog beams to multipath components to achieve higher channel capacity. Furthermore, for different beam allocation schemes, we investigated eigenvalue distributions of a channel Gram matrix, power allocation to each layer, and correlations between analog beams. Through simulation results, we have revealed that the analog beams should be steered to all the multipath components to lower correlations and to achieve higher channel capacity.
Type: article
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小川 恭孝

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