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Paper Abstract and Keywords
Presentation 2026-05-14 10:35
Throughput Enhancement using Delayed Transmit Signals for NTN Service Links in Direct-to-Cell Communications
Tomohiro Matsuyama, Yuta Takahashi, Yuki Hokazono, Hisayoshi Kano (NTT DOCOMO) SAT2026-3
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, enhancing the throughput of service links between terrestrial user equipment and aerial nodes has become an important research issue for advancing direct-to-device communications in Non-Terrestrial Networks (NTNs). To address this issue, recent studies have primarily focused on techniques that exploit multiplexing gains, such as spatial Multiple-Input Multiple-Output (MIMO) transmission through cooperation among multiple satellites and the application of Dual-Polarized MIMO assuming a single aerial node. On the other hand, given the propagation characteristics of NTN service links, where Line-of-Sight (LoS) conditions are dominant and multipath components are scarce, there has been insufficient investigation into designs that improve the communication quality of a single transmission itself through simple implementations. Under such conditions, methods that enhance communication quality without relying on multiplexing are of particular interest. One promising approach is to intentionally introduce delayed signal components at the transmitter to increase the channel’s frequency selectivity and thereby improve coding gain. Motivated by this perspective, this paper investigates the feasibility of applying transmit delay diversity to NTN service links assuming Direct-to-Cell (D2C) communications. Performance evaluations based on an NTN channel model show that, even under a channel model assuming LoS conditions, adding delayed transmit signals and controlling their power can improve throughput by up to approximately 0.14 bps/Hz.
Keyword (in Japanese) (See Japanese page) 
(in English) Non-Terrestrial Networks / Service Link / Delayed transmit signal / Frequency diversity / The Third Generation Partnership Project / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 18, SAT2026-3, pp. 13-18, May 2026.
Paper # SAT2026-3 
Date of Issue 2026-05-07 (SAT) 
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 SAT2026-3

Conference Information
Committee CQ CS SAT  
Conference Date 2026-05-14 - 2026-05-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kushiro Chamber of Commerce & Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SAT 
Conference Code 2026-05-CQ-CS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Throughput Enhancement using Delayed Transmit Signals for NTN Service Links in Direct-to-Cell Communications 
Sub Title (in English)  
Keyword(1) Non-Terrestrial Networks  
Keyword(2) Service Link  
Keyword(3) Delayed transmit signal  
Keyword(4) Frequency diversity  
Keyword(5) The Third Generation Partnership Project  
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1st Author's Name Tomohiro Matsuyama  
1st Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
2nd Author's Name Yuta Takahashi  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Yuki Hokazono  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Hisayoshi Kano  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2026-05-14 10:35:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2026-3 
Volume (vol) vol.126 
Number (no) no.18 
Page pp.13-18 
#Pages 6 
Date of Issue 2026-05-07 (SAT) 

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