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Paper Abstract and Keywords
Presentation 2026-03-01 15:15
Hardware-Based Interference Modeling for Multi-Rate Channels in VHF Narrowband IoT Systems
Kohei Agata (Shizuoka Univ.), Arata Kato (STE), Masakatsu Ogawa (Sophia Univ.), Tetsushi Ikegami (Meiji Univ.), Mineo Takai (Osaka Univ.), Susumu Ishihara (Shizuoka Univ.) SeMI2025-73
Abstract (in Japanese) (See Japanese page) 
(in English) The DR-IoT system, a VHF narrowband IoT communication system, operates by allocating diverse channels ranging from 4.8 to 300 kbps within the same frequency band. However, the interference characteristics among these multi-rate channels have not been sufficiently characterized. In this study, we quantitatively evaluated interference behavior using hardware implementations by measuring the packet error rate (PER) while varying the frequency offset and the desired-to-undesired signal ratio (D/U ratio). The results revealed that when a narrowband signal interferes with a wideband signal, interference tolerance significantly degrades as the frequency offset approaches the FSK frequency deviation of the desired signal. Furthermore, by incorporating the measured data into the network simulator Scenargie, we confirmed that the simulation effectively reproduces the actual device behavior, including frequency-offset-dependent characteristics. This approach enables highly reliable system evaluations that account for the unique properties of real-world hardware.
Keyword (in Japanese) (See Japanese page) 
(in English) VHF-IoT / DR-IoT / VHF-Band / IEEE 802.15.4 / FSK / Simulation / Interference /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 367, SeMI2025-73, pp. 40-45, March 2026.
Paper # SeMI2025-73 
Date of Issue 2026-02-22 (SeMI) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee SeMI IPSJ-MBL IPSJ-UBI  
Conference Date 2026-03-01 - 2026-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SeMI 
Conference Code 2026-03-SeMI-MBL-UBI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Hardware-Based Interference Modeling for Multi-Rate Channels in VHF Narrowband IoT Systems 
Sub Title (in English)  
Keyword(1) VHF-IoT  
Keyword(2) DR-IoT  
Keyword(3) VHF-Band  
Keyword(4) IEEE 802.15.4  
Keyword(5) FSK  
Keyword(6) Simulation  
Keyword(7) Interference  
Keyword(8)  
1st Author's Name Kohei Agata  
1st Author's Affiliation Shizuoka University (Shizuoka Univ.)
2nd Author's Name Arata Kato  
2nd Author's Affiliation Space-Time Engineering Japan, Inc. (STE)
3rd Author's Name Masakatsu Ogawa  
3rd Author's Affiliation Sophia University (Sophia Univ.)
4th Author's Name Tetsushi Ikegami  
4th Author's Affiliation Meiji University (Meiji Univ.)
5th Author's Name Mineo Takai  
5th Author's Affiliation Osaka University (Osaka Univ.)
6th Author's Name Susumu Ishihara  
6th Author's Affiliation Shizuoka University (Shizuoka Univ.)
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Speaker Author-1 
Date Time 2026-03-01 15:15:00 
Presentation Time 25 minutes 
Registration for SeMI 
Paper # SeMI2025-73 
Volume (vol) vol.125 
Number (no) no.367 
Page pp.40-45 
#Pages 6 
Date of Issue 2026-02-22 (SeMI) 

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