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Paper Abstract and Keywords
Presentation 2021-11-26 15:00
[Poster Presentation] Frame-Capture-Based CSI Recomposition Pertaining to Firmware-Agnostic WiFi Sensing
Ryosuke Hanahara, Sohei Itahara, Kota Yamashita (Kyoto Univ.), Yusuke Koda (Univ. Oulu), Akihito Taya (Kyoto Univ./Aoyama Gakuin Univ.), Takayuki Nishio (Kyoto Univ./Tokyo Tech.), Koji Yamamoto (Kyoto Univ.) SRW2021-48 SeMI2021-47 CNR2021-22
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents an estimation method of channel state information (CSI) matrices using corresponding beamforming feedback matrices (BFMs) contained in WLAN frames. The BFM is a right singular matrix computed by singular value decomposition of the CSI matrix. The CSI matrix is processed and discarded at the physical layer, while the BFM is exchanged between the access point and station
and can be obtained by frame capturing. On the other hand, more sensing tasks are based on CSI matrices rather than BFM. To fill this gap, this method uses machine learning to reconstruct the CSI matrices from the BFMs. The simulation results show that the estimated CSI amplitude approximates the ground-truth,
and leveraging BFMs on multiple subcarriers enhances prediction accuracy.
Keyword (in Japanese) (See Japanese page) 
(in English) channel state information / beamforming feedback / singular value decomposition / wireless sensing / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 266, SeMI2021-47, pp. 58-60, Nov. 2021.
Paper # SeMI2021-47 
Date of Issue 2021-11-18 (SRW, SeMI, CNR) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF SRW2021-48 SeMI2021-47 CNR2021-22

Conference Information
Committee SRW SeMI CNR  
Conference Date 2021-11-25 - 2021-11-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) IoT Workshop 
Paper Information
Registration To SeMI 
Conference Code 2021-11-SRW-SeMI-CNR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Frame-Capture-Based CSI Recomposition Pertaining to Firmware-Agnostic WiFi Sensing 
Sub Title (in English)  
Keyword(1) channel state information  
Keyword(2) beamforming feedback  
Keyword(3) singular value decomposition  
Keyword(4) wireless sensing  
1st Author's Name Ryosuke Hanahara  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Sohei Itahara  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
3rd Author's Name Kota Yamashita  
3rd Author's Affiliation Kyoto University (Kyoto Univ.)
4th Author's Name Yusuke Koda  
4th Author's Affiliation University of Oulu (Univ. Oulu)
5th Author's Name Akihito Taya  
5th Author's Affiliation Kyoto University/Aoyama Gakuin University (Kyoto Univ./Aoyama Gakuin Univ.)
6th Author's Name Takayuki Nishio  
6th Author's Affiliation Kyoto University/Tokyo Institute of Technology (Kyoto Univ./Tokyo Tech.)
7th Author's Name Koji Yamamoto  
7th Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2021-11-26 15:00:00 
Presentation Time 120 minutes 
Registration for SeMI 
Paper # SRW2021-48, SeMI2021-47, CNR2021-22 
Volume (vol) vol.121 
Number (no) no.265(SRW), no.266(SeMI), no.267(CNR) 
Page pp.71-73(SRW), pp.58-60(SeMI), pp.48-50(CNR) 
Date of Issue 2021-11-18 (SRW, SeMI, CNR) 

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