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Paper Abstract and Keywords
Presentation 2026-03-17 10:00
A Study and Experimental Evaluation of a Simplified Radio Propagation Model in Multi-Floor Buildings
Jiaxu Liang, Zhuoran Li, Osamu Muta (Kyushu Univ.) CAS2025-88 CS2025-81
Abstract (in Japanese) (See Japanese page) 
(in English) Radio-based multi-floor indoor positioning is attractive for tracking workers and tools in large facilities and construction sites. However, floor slabs and exterior walls distort the received signal strength (RSS), reducing the accuracy of RSS-based methods. This paper proposes a simplified radio propagation model for multi-floor buildings that separates a floor-transmitted (FT) component and a wall-transmitted reflected (WT) component, combined in the linear power domain. The model is validated through a scene-aligned ray-tracing simulation and on-site LoRa measurements conducted in a seven-floor corridor. Results show that the FT component dominates on lower floors, whereas the WT component dominates on upper floors, explaining the reduced floorwise separability. Compared with FT-only baselines, the proposed model fits the measurements more closely and provides interpretable, calibratable parameters useful for system design and tuning.
Keyword (in Japanese) (See Japanese page) 
(in English) Indoor propagation / multi-floor buildings / RSS / LoRa / wall transmission / reflection / modeling /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 415, CS2025-81, pp. 13-17, March 2026.
Paper # CS2025-81 
Date of Issue 2026-03-10 (CAS, CS) 
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 CAS2025-88 CS2025-81

Conference Information
Committee CAS CS  
Conference Date 2026-03-17 - 2026-03-18 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network processor, Signal processing and circuits for communications, Wireless LAN / PAN, etc. 
Paper Information
Registration To CS 
Conference Code 2026-03-CAS-CS 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study and Experimental Evaluation of a Simplified Radio Propagation Model in Multi-Floor Buildings 
Sub Title (in English)  
Keyword(1) Indoor propagation  
Keyword(2) multi-floor buildings  
Keyword(3) RSS  
Keyword(4) LoRa  
Keyword(5) wall transmission  
Keyword(6) reflection  
Keyword(7) modeling  
Keyword(8)  
1st Author's Name Jiaxu Liang  
1st Author's Affiliation Kyushu University (Kyushu Univ.)
2nd Author's Name Zhuoran Li  
2nd Author's Affiliation Kyushu University (Kyushu Univ.)
3rd Author's Name Osamu Muta  
3rd Author's Affiliation Kyushu University (Kyushu Univ.)
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Speaker Author-1 
Date Time 2026-03-17 10:00:00 
Presentation Time 20 minutes 
Registration for CS 
Paper # CAS2025-88, CS2025-81 
Volume (vol) vol.125 
Number (no) no.414(CAS), no.415(CS) 
Page pp.13-17 
#Pages 5 
Date of Issue 2026-03-10 (CAS, CS) 

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