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Paper Abstract and Keywords
Presentation 2023-10-19 10:55
Fractional Spreading Factor for LoRa Signals and Its Demodulation Algorithm
Ryoya Saito, Koichi Adachi, Takeo Fujii, Ryota Kumada (UEC) RCS2023-129
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, long-range wide area network (LoRaWAN), a low power wide area network (LPWAN) technology that facilitates long-range and low-power communication, has been attracting attention with the development of the Internet-of-things (IoT). This paper introduces a concept of non-integer spreading factor (FSF) to LoRa modulation for system throughput improvement. In the proposed FSF-LoRa, a fractional coefficient is introduced for changing the chip length of the LoRa signal, which realizes equivalent FSF. To mitigate the self-interference of the FSF-LoRa signal, this paper also proposes a demodulation algorithm that takes into account the structure of FSF-LoRa signal. The computer simulation results elucidate that the proposed FSF-LoRa can improve the system throughput by 14% compared to the original LoRa under an inter-spreading factor interference environment.
Keyword (in Japanese) (See Japanese page) 
(in English) LPWAN / LoRaWAN / LoRa / IoT / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 224, RCS2023-129, pp. 7-12, Oct. 2023.
Paper # RCS2023-129 
Date of Issue 2023-10-12 (RCS) 
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)
Download PDF RCS2023-129

Conference Information
Committee RCS  
Conference Date 2023-10-19 - 2023-10-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Kagawa University (Saiwai-cho Campus), and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, Future Wireless Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2023-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fractional Spreading Factor for LoRa Signals and Its Demodulation Algorithm 
Sub Title (in English)  
Keyword(1) LPWAN  
Keyword(2) LoRaWAN  
Keyword(3) LoRa  
Keyword(4) IoT  
1st Author's Name Ryoya Saito  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Koichi Adachi  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Takeo Fujii  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Ryota Kumada  
4th Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2023-10-19 10:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2023-129 
Volume (vol) vol.123 
Number (no) no.224 
Page pp.7-12 
Date of Issue 2023-10-12 (RCS) 

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