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Paper Abstract and Keywords
Presentation 2026-06-19 10:55
Improvement of LoRa modulation and its evaluation
Popuri Sakai (ATR/Doshisha Univ.), Satoru Shimizu (ATR) RCS2026-79
Abstract (in Japanese) (See Japanese page) 
(in English) We are conducting research and development on a V/UHF multilink wireless network usable over a wide area. We are also investigating a chirp spread spectrum scheme suitable for long-distance propagation to be implemented in this wireless system platform. This study focuses on the error characteristics of Long Range (LoRa) modulation and clarifies how bit mapping affects the bit error rate. First, LoRa demodulation errors are analyzed as symbol differences, showing that adjacent‑symbol errors dominate under low‑noise conditions. Next, the Hamming‑distance characteristics of random, natural, and gray codes are compared, and the theoretical improvement rate of the bit error rate by gray coding is derived. Furthermore, simulation and hardware evaluation confirm the effectiveness of gray coding.
Keyword (in Japanese) (See Japanese page) 
(in English) LoRa / Chirp Spread Spectrum / Gray code / Bit mapping / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-79, pp. 303-308, June 2026.
Paper # RCS2026-79 
Date of Issue 2026-06-10 (RCS) 
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 RCS2026-79

Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improvement of LoRa modulation and its evaluation 
Sub Title (in English)  
Keyword(1) LoRa  
Keyword(2) Chirp Spread Spectrum  
Keyword(3) Gray code  
Keyword(4) Bit mapping  
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1st Author's Name Popuri Sakai  
1st Author's Affiliation Advanced Telecommunications Research Institute International/Doshisha University (ATR/Doshisha Univ.)
2nd Author's Name Satoru Shimizu  
2nd Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
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Speaker Author-1 
Date Time 2026-06-19 10:55:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-79 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.303-308 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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