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Presentation 2021-03-02 14:30
[Poster Presentation] A Preliminary Study on Wi-Fi CSI Imaging
Kazuki Okawara (Osaka Univ.), Akira Uchiyama (Osaka Univ./JST PRESTO), Viktor Erdelyi (Osaka Univ.), Tomoki Murakami, Hirantha Abeysekera (NTT), Teruo Higashino (Osaka Univ.) SeMI2020-68
Abstract (in Japanese) (See Japanese page) 
(in English) Human activity recognition using Wi-Fi CSI (Channel State Information) has been widely studied recently. CSI has advantages of low deployment cost and less privacy concern. On the other hand, CSI-based human activity recognition requires a heavy human effort for training data collection for each environment. One of solutions is Wi-Fi imaging which maps signal strength for each direction based on phase difference between antennas of an array. Because the phase difference is calculated based on the inter-antenna distance, Wi-Fi imaging is performed independently of environment. If Wi-Fi imaging is capable of capturing locations and/or poses of humans, it may be applicable to human localization and/or activity recognition. In this paper, we implemented Wi-Fi CSI imaging by an array of four antennas and conducted preliminary experiment by using a copper plate. From the results, we confirmed that imaging of the copper plate is possible for the angles between 60 and 120 degrees to the surface of the antenna array in the environment without reflection from surroundings.
Keyword (in Japanese) (See Japanese page) 
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Reference Info. IEICE Tech. Rep., vol. 120, no. 382, SeMI2020-68, pp. 63-66, March 2021.
Paper # SeMI2020-68 
Date of Issue 2021-02-22 (SeMI) 
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)
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Conference Information
Conference Date 2021-03-01 - 2021-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Computing, Ubiquitous Computing, etc. 
Paper Information
Registration To SeMI 
Conference Code 2021-03-SeMI-MBL-UBI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Preliminary Study on Wi-Fi CSI Imaging 
Sub Title (in English)  
1st Author's Name Kazuki Okawara  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Akira Uchiyama  
2nd Author's Affiliation Osaka University/Japan Science and Technology Agency, PRESTO (Osaka Univ./JST PRESTO)
3rd Author's Name Viktor Erdelyi  
3rd Author's Affiliation Osaka University (Osaka Univ.)
4th Author's Name Tomoki Murakami  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Hirantha Abeysekera  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
6th Author's Name Teruo Higashino  
6th Author's Affiliation Osaka University (Osaka Univ.)
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Speaker Author-1 
Date Time 2021-03-02 14:30:00 
Presentation Time 60 minutes 
Registration for SeMI 
Paper # SeMI2020-68 
Volume (vol) vol.120 
Number (no) no.382 
Page pp.63-66 
Date of Issue 2021-02-22 (SeMI) 

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