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Paper Abstract and Keywords
Presentation 2026-06-18 10:05
Investigation of NOMA Using Network Coding for FEC Coded Bits for Two-Way Relay Networks
Kaito Toda (Tokyo Univ. of Science), Satoshi Suyama, Satoshi Nagata (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2026-51
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we consider a highly reliable and low-latency bidirectional relay transmission system that uses a high altitude platform station (HAPS) as a relay station, which is capable of achieving low latency without passing through a core network, to enable remote control of surgical robots and other devices. To achieve this, we propose a relay transmission method that combines network coding for forward error-correction coded bits (CNC) with non-orthogonal multiple access (NOMA). Unlike conventional network coding (NC), which encodes individual information bits, CNC first encodes the information bits destined for each pair of terminals independently using FEC at arbitrary coding rates, and then generates the NC bits based on an exclusive OR (ExOR) operation. CNC enables transmission rate control that adapts to differences in propagation channels between terminals. On the other hand, since CNC bits cannot be FEC-decoded by the other pair of terminals, the proposed NOMA scheme for transmitting signals between different pairs applies conventional NC to pairs with poor propagation conditions, thereby enabling high-efficiency transmission through the use of a successive interference canceller (SIC). Furthermore, we present an optimal resource-control method to minimize the required bandwidth. We compare the proposed method with conventional methods through computer simulations to quantitatively demonstrate its effectiveness.
Keyword (in Japanese) (See Japanese page) 
(in English) two-way relay networks / network coding / forward error-correction coding / non-orthogonal multiple access / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-51, pp. 147-153, June 2026.
Paper # RCS2026-51 
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 RCS2026-51

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) Investigation of NOMA Using Network Coding for FEC Coded Bits for Two-Way Relay Networks 
Sub Title (in English)  
Keyword(1) two-way relay networks  
Keyword(2) network coding  
Keyword(3) forward error-correction coding  
Keyword(4) non-orthogonal multiple access  
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1st Author's Name Kaito Toda  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Satoshi Suyama  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Satoshi Nagata  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Kenichi Higuchi  
4th Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2026-06-18 10:05:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-51 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.147-153 
#Pages 7 
Date of Issue 2026-06-10 (RCS) 

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