University of Oulu

Y. Lyu, A. W. Mbugua, K. Olesen, P. Kyösti and W. Fan, "Design and Validation of the Phase-Compensated Long-Range Sub-THz VNA-Based Channel Sounder," in IEEE Antennas and Wireless Propagation Letters, vol. 20, no. 12, pp. 2461-2465, Dec. 2021, doi: 10.1109/LAWP.2021.3114626

Design and validation of the phase-compensated long-range sub-THz VNA-based channel sounder

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Author: Lyu, Yejian1; Mbugua, Allan Wainaina2; Olesen, Kim1;
Organizations: 1Antenna, Propagation and Millimeter-Wave Systems Section, Department of Electronic Systems, Faculty of Engineering and Science, Aalborg University, 9220 Aalborg, Denmark
2Antenna, Propagation and Millimeter-Wave Systems Section, Department of Electronic Systems, Faculty of Engineering and Science, Aalborg University, 9220 Aalborg, Denmark, and also with the Munich Research Center, Huawei Technologies Duesseldorf GmbH, 80992 Munich, Germany
3Oulu University, 90630 Oulu, Finland
4Keysight Technologies Finland Oy, 90630 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022022520837
Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2022-02-25
Description:

Abstract

This letter presents the first vector network analyzer based subterahertz (sub-THz) phase-compensated channel sounder at 220–330 GHz using radio-over-fiber techniques that could enable long-range phase-coherent measurements. The optical cable solution enables long-range channel measurements at sub-THz bands, since it can effectively minimize the cable loss. This letter also proposes a novel phase compensation scheme to stabilize the phase variations introduced by optical fiber of the channel sounder to enable its application in multichannel/antenna measurements. This proposed channel sounder is validated in back-to-back measurements under two optical cable conditions, i.e., with presence of thermal changes and mechanical stress. The phase variation introduced by the cable effects in the system is shown to be over 400 in 220–330 GHz, compared to 15 at 220–288 GHz and 37 in 288–330 GHz after compensation, respectively, demonstrating the robustness and effectiveness of the developed channel sounder in practice. The developed system, which has a dynamic range of 106.7 dB, can support measurement range up to 300 m (limited by the optical cable length in our system and subject to over-the-air signal transmission loss in practical environment).

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Series: IEEE antennas and wireless propagation letters
ISSN: 1536-1225
ISSN-E: 1548-5757
ISSN-L: 1536-1225
Volume: 20
Issue: 12
Pages: 2461 - 2465
DOI: 10.1109/LAWP.2021.3114626
OADOI: https://oadoi.org/10.1109/LAWP.2021.3114626
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
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