University of Oulu

P. Zhang, P. Kyosti, K. Haneda, P. Koivumaki, Y. Lyu and W. Fan, "Out-of-Band Information Aided mmWave/THz Beam Search: A Spatial Channel Similarity Perspective," in IEEE Communications Magazine, doi: 10.1109/MCOM.001.2200398.

Out-of-band information aided mmWave/THz beam search : a spatial channel similarity perspective

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Author: Zhang, Peize1; Kyösti, Pekka1,2; Haneda, Katsuyuki3;
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
2Keysight Technologies Finland, Finland
3Aalto University, Finland
4Aalborg University, Denmark
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
Persistent link:
Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-12-19


The transition to higher frequency bands, e.g., millimeter-wave (mmWave) and terahertz (THz), will be capitalized on the long term for future wireless communications. One of challenges relates to rapid establishment of mmWave/THz links with low beam training overhead due to highly directional transmission. A promising solution is to take advantage of the coexistence of sub-6 GHz, mmWave, and THz wireless networks and to use out-of-band spatial information for enabling fast beam search. The success depends on the spatial similarity of radio channels across different frequency bands. In this article we promote a feasibility study of low-frequency spatial channel information assisted high-frequency beam search from a radio channel point of view. We develop multi-band channel similarity measure of desired beam directions extracted from radio channels, which are obtained via filtering propagation paths by different beampatterns at different frequencies. Measurementand ray-tracing-based evaluations across multiple frequencies and environments are performed, which prove the usability of out-of-band information aided beam search strategy in line-ofsight (LOS) dominated scenario and even in non-LOS scenario. Finally, we discuss the challenges associated with exploiting spatial channel similarity.

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Series: IEEE communications magazine
ISSN: 0163-6804
ISSN-E: 1558-1896
ISSN-L: 0163-6804
Volume: In press
DOI: 10.1109/mcom.001.2200398
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has been partly funded by the European Commission through the H2020 project Hexa-X (Grant Agreement no. 101015956) and partly by 6G Flagship programme, funded by Academy of Finland (Grant no. 346208).
EU Grant Number: (101015956) Hexa-X - A flagship for B5G/6G vision and intelligent fabric of technology enablers connecting human, physical, and digital worlds
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
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