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Paper Abstract and Keywords
Presentation 2020-09-04 09:40
A Study on Chip-Pair Codes for Synchronous Optical CDMA Systems
Tomoko K. Matsushima, Shoichiro Yamasaki, Kyohei Ono (Polytechnic Univ.) IT2020-19
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a class of chip-pair codes for synchronous optical code-division multiple access (CDMA) and shows a general construction method of these codes. The chip-pair codes can be obtained from generalized modified prime sequence codes (GMPSCs) based on extension fields GF($q$) where $q = p^m$, $p$ is a prime number and $m$ is a positive integer. It has been reported that optical CDMA systems using GMPSCs remove not only multi-user interference (MUI) but also optical interference (e.g. background light) whose intensity is constant during a slot of length $q^2$. Recently, the authors have reported that optical CDMA systems using GMPSCs also remove optical interference whose intensity varies by block with a length of $q$ chips. The present paper shows that optical CDMA system using the proposed chip-pair code and equal-weight orthogonal (EWO) scheme removes interference light whose intensity varies by shorter block with a length of $p$ chips without requiring an additional equipment.
Keyword (in Japanese) (See Japanese page) 
(in English) optical CDMA / generalized modified prime sequence code / chip-pair code / optical interference / background light / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 157, IT2020-19, pp. 7-12, Sept. 2020.
Paper # IT2020-19 
Date of Issue 2020-08-28 (IT) 
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 IT2020-19

Conference Information
Committee IT  
Conference Date 2020-09-04 - 2020-09-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Error correcting codes, General 
Paper Information
Registration To IT 
Conference Code 2020-09-IT 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Chip-Pair Codes for Synchronous Optical CDMA Systems 
Sub Title (in English)  
Keyword(1) optical CDMA  
Keyword(2) generalized modified prime sequence code  
Keyword(3) chip-pair code  
Keyword(4) optical interference  
Keyword(5) background light  
1st Author's Name Tomoko K. Matsushima  
1st Author's Affiliation Polytechnic University (Polytechnic Univ.)
2nd Author's Name Shoichiro Yamasaki  
2nd Author's Affiliation Polytechnic University (Polytechnic Univ.)
3rd Author's Name Kyohei Ono  
3rd Author's Affiliation Polytechnic University (Polytechnic Univ.)
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Speaker Author-1 
Date Time 2020-09-04 09:40:00 
Presentation Time 25 minutes 
Registration for IT 
Paper # IT2020-19 
Volume (vol) vol.120 
Number (no) no.157 
Page pp.7-12 
Date of Issue 2020-08-28 (IT) 

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