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Paper Abstract and Keywords
Presentation 2025-07-31 10:20
Evaluation of Interference reduction effectiveness during the superposition of multiple signals using Variable Bandwidth LoRa
Jin Wakita, Takeo Fujii (UEC) SR2025-26
Abstract (in Japanese) (See Japanese page) 
(in English) Using LoRa modulation, it is difficult to simultaneously receive signals of the same spreading factor. To address this, Variable Bandwidth LoRa (VBW-LoRa) has been shown to reduce the symbol error rate in environments where multiple LoRa signals are multiplexed. However, even with VBW-LoRa, signals transmitted from far away from the gateway may be lost due to the near-far problem. Moreover, the feasibility of time synchronization for VBW-LoRa as well as the impact of interference on demodulation performance after time synchronization has not yet been clarified. We focus on the demodulation performance of superimposed VBW-LoRa signals after time synchronization. By evaluating the impact of the signal-to-interference ratio on this performance through simulation, we clarify the interference characteristics to establish a basis for future parameter control.
Keyword (in Japanese) (See Japanese page) 
(in English) LPWA / LoRa Modulation / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 134, SR2025-26, pp. 50-57, July 2025.
Paper # SR2025-26 
Date of Issue 2025-07-23 (SR) 
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 SR2025-26

Conference Information
Committee SR RCS RCC SeMI NS RISING HCL  
Conference Date 2025-07-30 - 2025-08-01 
Place (in Japanese) (See Japanese page) 
Place (in English) MALIOS 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SR 
Conference Code 2025-07-SR-RCS-RCC-SeMI-NS-RISING-HCL 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of Interference reduction effectiveness during the superposition of multiple signals using Variable Bandwidth LoRa 
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Keyword(1) LPWA  
Keyword(2) LoRa Modulation  
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1st Author's Name Jin Wakita  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Takeo Fujii  
2nd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2025-07-31 10:20:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2025-26 
Volume (vol) vol.125 
Number (no) no.134 
Page pp.50-57 
#Pages 8 
Date of Issue 2025-07-23 (SR) 

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