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Paper Abstract and Keywords
Presentation 2026-07-22 16:15
[Short Paper] A Study on Superposition-Based Spectrum Sharing for LEO-GEO Downlink Service Links
Tatsuro Hidaka, Osamu Takyu (Shinshu Univ.), Kei Inage (TMCIT), Takeo Fujii (UEC), Kohei Yoshida, Masayuki Ariyoshi (NEC) SR2026-42
Abstract (in Japanese) (See Japanese page) 
(in English) This study considers spectrum sharing for downlink service links between a primary geostationary Earth orbit (GEO) satellite system and a secondary low Earth orbit (LEO) satellite system. In GEO–LEO coexistence environments, collinear interference occurs when the GEO satellite, GEO user, and LEO satellite are located nearly on the same line, forcing the LEO system to reduce its transmit power to protect the GEO user (GU), which degrades the SINR performance of the LEO user (LU). To address this issue, we apply a superposition transmission scheme in which the LEO satellite simultaneously transmits a signal intended for the GU and its own signal for the LU over the same frequency while the GEO transmission is active. The effectiveness of the proposed scheme under collinear interference conditions is evaluated. Simulation results demonstrate that the proposed scheme improves the reception quality of the LU while maintaining the reception quality of the GU.
Keyword (in Japanese) (See Japanese page) 
(in English) Satellite Communication / Spectrum Sharing / Low Earth Orbit / Geostationary Earth Orbit / Superposition Transmission / Co-channel Interference / Coexistence System / Collinear Interference  
Reference Info. IEICE Tech. Rep., vol. 126, no. 120, SR2026-42, pp. 114-116, July 2026.
Paper # SR2026-42 
Date of Issue 2026-07-14 (SR) 
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 SR2026-42

Conference Information
Committee SR RCC  
Conference Date 2026-07-21 - 2026-07-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi 
Topics (in Japanese) (See Japanese page) 
Topics (in English) IoT, Wireless Distributed Networks, Sensor Networks, Control Communications, Network Control, General Topics 
Paper Information
Registration To SR 
Conference Code 2026-07-SR-RCC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Superposition-Based Spectrum Sharing for LEO-GEO Downlink Service Links 
Sub Title (in English)  
Keyword(1) Satellite Communication  
Keyword(2) Spectrum Sharing  
Keyword(3) Low Earth Orbit  
Keyword(4) Geostationary Earth Orbit  
Keyword(5) Superposition Transmission  
Keyword(6) Co-channel Interference  
Keyword(7) Coexistence System  
Keyword(8) Collinear Interference  
1st Author's Name Tatsuro Hidaka  
1st Author's Affiliation Shinshu University (Shinshu Univ.)
2nd Author's Name Osamu Takyu  
2nd Author's Affiliation Shinshu University (Shinshu Univ.)
3rd Author's Name Kei Inage  
3rd Author's Affiliation Tokyo Metropolitan College of Industrial Technology (TMCIT)
4th Author's Name Takeo Fujii  
4th Author's Affiliation The University of Electro-Communications (UEC)
5th Author's Name Kohei Yoshida  
5th Author's Affiliation Connected Infrastructure Research Laboratories, NEC Corporation (NEC)
6th Author's Name Masayuki Ariyoshi  
6th Author's Affiliation Connected Infrastructure Research Laboratories, NEC Corporation (NEC)
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Speaker Author-1 
Date Time 2026-07-22 16:15:00 
Presentation Time 15 minutes 
Registration for SR 
Paper # SR2026-42 
Volume (vol) vol.126 
Number (no) no.120 
Page pp.114-116 
#Pages 3 
Date of Issue 2026-07-14 (SR) 

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