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Paper Abstract and Keywords
Presentation 2026-04-27 17:30
A Study on M-ary Coding for Synchronous Optical CDMA System Using Level Division Multiplexing to Improve Throughput
Yusei Hara, Kotoku Omura, Shinichiro Miyazaki (PTU) PN2026-4
Abstract (in Japanese) (See Japanese page) 
(in English) In synchronous optical code division multiple access systems,the level division multiplexing (LDM) has been studied as an effective technique for increasing communication throughput. However, as the maximum number of layers increases, the bit error rate (BER) performance degrades, which imposes a practical limit on the achievable number of layers.
In the $M$-ary codeword assignment scheme for modified prime sequence code, $M$ information values are assigned to $M$ codewords selected from a group of $q$ codewords, where $M=2$ corresponds to the conventional scheme and $M=q$ corresponds to the $q$-ary assignment scheme. The $q$-ary assignment scheme improves power efficiency per information bit compared to the conventional scheme, allowing a larger maximum number of LDM layers. However, since the number of transmittable information bits per layer is smaller than that of the conventional scheme, the overall system throughput is reduced.
In this paper, we propose a new codeword assignment scheme with $M=4$ to improve the overall system throughput. The proposed scheme achieves the same number of information bits per layer as the conventional scheme while increasing the maximum number of LDM layers by one. Furthermore, under the condition of equivalent BER performance, we show through theoretical analysis and computer simulations that the proposed scheme achieves higher overall system throughput than both the conventional and $q$-ary assignment schemes.
Keyword (in Japanese) (See Japanese page) 
(in English) code division multiple access / level division multiplexing / visible light communication / M-ary / coding / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 10, PN2026-4, pp. 13-19, April 2026.
Paper # PN2026-4 
Date of Issue 2026-04-20 (PN) 
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)
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Conference Information
Committee PN QCN  
Conference Date 2026-04-27 - 2026-04-27 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To PN 
Conference Code 2026-04-PN-QCN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on M-ary Coding for Synchronous Optical CDMA System Using Level Division Multiplexing to Improve Throughput 
Sub Title (in English)  
Keyword(1) code division multiple access  
Keyword(2) level division multiplexing  
Keyword(3) visible light communication  
Keyword(4) M-ary  
Keyword(5) coding  
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Keyword(8)  
1st Author's Name Yusei Hara  
1st Author's Affiliation The Polytechnic University of Japan (PTU)
2nd Author's Name Kotoku Omura  
2nd Author's Affiliation The Polytechnic University of Japan (PTU)
3rd Author's Name Shinichiro Miyazaki  
3rd Author's Affiliation The Polytechnic University of Japan (PTU)
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Speaker Author-1 
Date Time 2026-04-27 17:30:00 
Presentation Time 25 minutes 
Registration for PN 
Paper # PN2026-4 
Volume (vol) vol.126 
Number (no) no.10 
Page pp.13-19 
#Pages 7 
Date of Issue 2026-04-20 (PN) 

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