University of Oulu

R. Hanahara et al., "Frame-Capture-Based CSI Recomposition Pertaining to Firmware-Agnostic WiFi Sensing," 2022 IEEE 19th Annual Consumer Communications & Networking Conference (CCNC), Las Vegas, NV, USA, 2022, pp. 352-356, doi: 10.1109/CCNC49033.2022.9700520

Frame-capture-based CSI recomposition pertaining to firmware-agnostic WiFi sensing

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Author: Hanahara, Ryosuke1; Itahara, Sohei1; Yamashita, Kota1;
Organizations: 1Graduate School of Informatics, Kyoto University, Kyoto, Japan
2Centre for Wireless Communications, University of Oulu, Oulu, Finland
3College of Science and Engineering, Aoyama Gakuin University, Sagamihara-shi, Kanagawa, Japan
4School of Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2023-02-10


With regard to the implementation of WiFi sensing agnostic according to the availability of channel state information (CSI), we investigate the possibility of estimating a CSI matrix based on its compressed version, which is known as beamforming feedback matrix (BFM). Being different from the CSI matrix that is processed and discarded in physical layer components, the BFM can be captured using a medium-access-layer frame-capturing technique because this is exchanged among an access point (AP) and stations (STAs) over the air. This indicates that WiFi sensing that leverages the BFM matrix is more practical to implement using the pre-installed APs. However, the ability of BFM-based sensing has been evaluated in a few tasks, and more general insights into its performance should be provided. To fill this gap, we propose a CSI estimation method based on BFM, approximating the estimation function with a machine learning model. In addition, to improve the estimation accuracy, we leverage the inter-subcarrier dependency using the BFMs at multiple subcarriers in orthogonal frequency division multiplexing transmissions. Our simulation evaluation reveals that the estimated CSI matches the ground-truth amplitude. Moreover, compared to CSI estimation at each individual subcarrier, the effect of the BFMs at multiple subcarriers on the CSI estimation accuracy is validated.

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Series: IEEE Consumer Communications and Networking Conference
ISSN: 2331-9852
ISSN-E: 2331-9860
ISSN-L: 2331-9852
ISBN: 978-1-6654-3161-3
ISBN Print: 978-1-6654-3162-0
Pages: 352 - 356
DOI: 10.1109/ccnc49033.2022.9700520
Host publication: 2022 IEEE 19th Annual Consumer Communications & Networking Conference (CCNC)
Conference: IEEE Annual Consumer Communications & Networking Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research and development work was partially supported by the MIC/SCOPE #JP196000002 and JSPS KAKENHI (under Grant No. JP18H01442).
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