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Paper Abstract and Keywords
Presentation 2026-06-01 10:05
Posture Change Estimation in Indoor NLOS Environments for Elderly Fall Monitoring
Yuya Sakai, Haruto Utsushigawa, Kun Li (UEC) WBS2026-1 RCC2026-1 MICT2026-1
Abstract (in Japanese) (See Japanese page) 
(in English) With the rapid aging of society, posture estimation using Wi-Fi Channel State Information (CSI) has attracted attention as a continuous and contactless method for monitoring falls among the elderly, particularly in non-line-of-sight (NLOS) environments where direct visual observation is difficult. In this study, we simulated indoor radio wave propagation using the ray-tracing method, and investigated the variations in the Power Delay Profile (PDP) caused by posture changes and receiving antenna positions. Furthermore, Principal Component Analysis (PCA) was applied to the derived PDPs to evaluate the impact of these factors. The analysis revealed that the variance in the feature space is overwhelmingly dominated by the spatial arrangement of the receiving antennas rather than the changes in human posture.
Keyword (in Japanese) (See Japanese page) 
(in English) Wi-Fi Sensing / Channel State Information (CSI) / Power Delay Profile / Ray Tracing / Principal Component Analysis (PCA) / Non-Line-Of-Sight (NLOS) / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 48, MICT2026-1, pp. 1-4, June 2026.
Paper # MICT2026-1 
Date of Issue 2026-05-25 (WBS, RCC, MICT) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 WBS2026-1 RCC2026-1 MICT2026-1

Conference Information
Committee RCC MICT WBS  
Conference Date 2026-06-01 - 2026-06-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Yokosuka Research Park(YRP) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Reliable Communication and Control, Healthcare and Medical Information Communication Technologies, Coding, Modulation, Signal processing and General 
Paper Information
Registration To MICT 
Conference Code 2026-06-RCC-MICT-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Posture Change Estimation in Indoor NLOS Environments for Elderly Fall Monitoring 
Sub Title (in English)  
Keyword(1) Wi-Fi Sensing  
Keyword(2) Channel State Information (CSI)  
Keyword(3) Power Delay Profile  
Keyword(4) Ray Tracing  
Keyword(5) Principal Component Analysis (PCA)  
Keyword(6) Non-Line-Of-Sight (NLOS)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yuya Sakai  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Haruto Utsushigawa  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Kun Li  
3rd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2026-06-01 10:05:00 
Presentation Time 25 minutes 
Registration for MICT 
Paper # WBS2026-1, RCC2026-1, MICT2026-1 
Volume (vol) vol.126 
Number (no) no.46(WBS), no.47(RCC), no.48(MICT) 
Page pp.1-4 
#Pages 4 
Date of Issue 2026-05-25 (WBS, RCC, MICT) 

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