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Paper Abstract and Keywords
Presentation 2023-12-15 12:10
Orthogonal Constellation Design for Complexity Reduction of Downlink SCMA Systems
Leo Tomura, Takahiko Saba (CIT) RCS2023-199
Abstract (in Japanese) (See Japanese page) 
(in English) Sparse code multiple access (SCMA) is a non-orthogonal multiple access scheme which is to be used in the next generation communications systems. A problem inherent in SCMA is its large computational complexity that is required for detection. In this paper, we propose an amplitude shift keying-based constellation design scheme for SCMA codebooks which can reduce computational complexity required for detection. We added two additional orthogonal axes to the IQ plane along with I-axis and Q-axis, and we placed constellation points of each user on these four axes. This orthogonality reduces the number of users' signals that influence one another. This paper shows that our proposed scheme reduces complexity to 8 percent compared to conventional scheme without bit error rate (BER) degradation.
Keyword (in Japanese) (See Japanese page) 
(in English) SCMA / MPA / codebook / factor graph / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 308, RCS2023-199, pp. 118-121, Dec. 2023.
Paper # RCS2023-199 
Date of Issue 2023-12-07 (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 RCS2023-199

Conference Information
Committee NS RCS  
Conference Date 2023-12-14 - 2023-12-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Institute of Technology Tobata campus, and Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Multi-hop/Relay/Cooperation, Disaster-resistant wireless network, Sensor/Mesh network, Ad-hoc network, D2D/M2M, Wireless network coding, Handover/AP switching/Connected cell control/Load balancing among base stations/Mobile network dynamic reconfiguration, QoS/QoE assurance, Wireless VoIP, IoT, Edge computing, etc. 
Paper Information
Registration To RCS 
Conference Code 2023-12-NS-RCS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Orthogonal Constellation Design for Complexity Reduction of Downlink SCMA Systems 
Sub Title (in English)  
Keyword(1) SCMA  
Keyword(2) MPA  
Keyword(3) codebook  
Keyword(4) factor graph  
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1st Author's Name Leo Tomura  
1st Author's Affiliation Chiba Institute of Technology (CIT)
2nd Author's Name Takahiko Saba  
2nd Author's Affiliation Chiba Institute of Technology (CIT)
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Speaker Author-1 
Date Time 2023-12-15 12:10:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2023-199 
Volume (vol) vol.123 
Number (no) no.308 
Page pp.118-121 
#Pages 4 
Date of Issue 2023-12-07 (RCS) 

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