University of Oulu

M. F. De Guzman, N. Tervo, P. Kyösti and K. Haneda, "Analyses of Beamspace MIMO Channels at 142GHz," in IEEE Antennas and Wireless Propagation Letters, doi: 10.1109/LAWP.2023.3324614

Analyses of beamspace MIMO channels at 142GHz

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Author: De Guzman, Mar Francis1; Tervo, Nuutti2; Kyösti, Pekka2,3;
Organizations: 1Department of Electronics and Nanoengineering, Aalto University, Espoo, Finland
2Centre for Wireless Communications, University of Oulu, Finland
3Keysight Technologies Finland Oy., Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-10-20


This paper presents the analyses of a single-user beamspace MIMO on measured indoor and outdoor channels at 142 GHz. The rank is evaluated under different antenna sizes, number of beams, and thresholds. We assume a total power constraint at the transmitter which results in a decrease in signal-to-noise ratio as the link distance increases. When using spatial multiplexing, the indoor and outdoor sites demonstrate an average capacity gain of 2x and 1.5x at link distances below 60 m. Also, the rank for our measured 142 GHz channels is comparable to that at 60 GHz channels but significantly lower than the rank at 5 GHz channels reported in the literature. We also found that at 142 GHz, the indoor and outdoor sites have median ranks of 3.0 and 1.7 for the small antenna case, and 4.9 and 2.4 for the large antenna case assuming a rank threshold of 20 dB. The indoor site has a rank higher by 1.8 than the outdoor site, regardless of antenna size. The rank decreases by only 20% and 15% for indoor and outdoor scenarios when beam density is halved, allowing a significant reduction in implementation complexity of the beamspace MIMO without remarkably reducing the rank.

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Series: IEEE antennas and wireless propagation letters
ISSN: 1536-1225
ISSN-E: 1548-5757
ISSN-L: 1536-1225
Issue: Early access
DOI: 10.1109/LAWP.2023.3324614
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The authors would like to acknowledge financial support from the European Union’s Horizon 2020 research and innovation programme project Hexa-X under grant agreement No. 101015956, where the double-directional sub-THz channel model [1] that we use in this manuscript was developed. The work that analyzes the MIMO channel characteristics has been supported by the Smart Networks and Services Joint Undertaking under the European Union’s Horizon Europe research and innovation programme Hexa-X-II under Grant Agreement No. 101095759.
EU Grant Number: (101015956) Hexa-X - A flagship for B5G/6G vision and intelligent fabric of technology enablers connecting human, physical, and digital worlds
(101095759) Hexa-X-II - A holistic flagship towards the 6G network platform and system, to inspire digital transformation, for the world to act together in meeting needs in society and ecosystems with novel 6G services
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