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Paper Abstract and Keywords
Presentation 2018-03-08 14:15
Shifted Coded Slotted ALOHA
Tomokazu Emoto, Takayuki Nozaki (Yamaguchi Univ.) IT2017-113 ISEC2017-101 WBS2017-94
Abstract (in Japanese) (See Japanese page) 
(in English) In the random access scheme, each user randomly transmits packets in accordance with a predetermined rule.
In this scheme, a collision occurs when some users simultaneously transmit to one channel.
It is known that collisions degrade throughput.
In recent years, successive interference cancellation (SIC) was introduced into the random access scheme.
It is possible to decode transmitted packets using collided packets by the SIC.
The coded slotted ALOHA (CSA) is a protocol using the SIC.
The CSA encodes each packet using a local code prior to transmission.
It is known that the CSA achieves excellent throughput.
On the other hand, it is reported that in the coding theory time shift improves the decoding performance.
In this report, we propose a protocol which applies the time shift to the CSA in order to achieve better throughput.
Numerical examples show that our proposed protocol achieves better throughput and packet loss rate than the CSA.
Keyword (in Japanese) (See Japanese page) 
(in English) random access / coded slotted ALOHA / shift / successive interference cancellation / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 487, IT2017-113, pp. 61-66, March 2018.
Paper # IT2017-113 
Date of Issue 2018-03-01 (IT, ISEC, WBS) 
ISSN Print edition: ISSN 0913-5685    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 IT2017-113 ISEC2017-101 WBS2017-94

Conference Information
Committee WBS IT ISEC  
Conference Date 2018-03-08 - 2018-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Katsusika Campas, Tokyo University of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) joint meeting of IT, ISEC, and WBS 
Paper Information
Registration To IT 
Conference Code 2018-03-WBS-IT-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Shifted Coded Slotted ALOHA 
Sub Title (in English)  
Keyword(1) random access  
Keyword(2) coded slotted ALOHA  
Keyword(3) shift  
Keyword(4) successive interference cancellation  
1st Author's Name Tomokazu Emoto  
1st Author's Affiliation Yamaguchi University (Yamaguchi Univ.)
2nd Author's Name Takayuki Nozaki  
2nd Author's Affiliation Yamaguchi University (Yamaguchi Univ.)
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Speaker Author-1 
Date Time 2018-03-08 14:15:00 
Presentation Time 25 minutes 
Registration for IT 
Paper # IT2017-113, ISEC2017-101, WBS2017-94 
Volume (vol) vol.117 
Number (no) no.487(IT), no.488(ISEC), no.489(WBS) 
Page pp.61-66 
Date of Issue 2018-03-01 (IT, ISEC, WBS) 

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