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Paper Abstract and Keywords
Presentation 2025-11-12 13:50
Measurement of Antenna Coupling for UAV-Assisted In-Band Full-Duplex FPU Relay Systems
Takuya Kurakake, Fumito Ito, Fumiya Yamagishi, Kazuhiko Mitsuyama (NHK) RCS2025-153
Abstract (in Japanese) (See Japanese page) 
(in English) Hover-in-place unmanned aerial vehicles (UAVs), widely employed for shooting in program production , are increasingly expected as hovering relay stations for Field Pick-up Unit (FPU) links. To improve spectral efficiency, in-band full-duplex relaying is desirable; however, loopback self-interference (SI) remains a critical challenge. Furthermore, mitigating the limited flight duration of UAV relays through periodic replacement introduces inter-relay interference (IRI). To address these issues, we have conducted empirical measurements of SI and IRI for FPU relays operating in the 6.5 GHz and 42 GHz bands. The results indicate that SI suppression is essential for 6.5 GHz band relays, while IRI mitigation depends strongly on the positional accuracy of hovering UAVs. These findings provide key insights for the practical deployment of UAV-based full-duplex relay systems.
Keyword (in Japanese) (See Japanese page) 
(in English) UAV-Assisted relay / In-Band Full-Duplex Relay / Loopback Self-Interference / Inter-Relay Interference / Field Pick-up Unit (FPU) / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 242, RCS2025-153, pp. 37-42, Nov. 2025.
Paper # RCS2025-153 
Date of Issue 2025-11-05 (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 RCS2025-153

Conference Information
Committee AP RCS  
Conference Date 2025-11-12 - 2025-11-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime Prefectural Convention Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2025-11-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Measurement of Antenna Coupling for UAV-Assisted In-Band Full-Duplex FPU Relay Systems 
Sub Title (in English)  
Keyword(1) UAV-Assisted relay  
Keyword(2) In-Band Full-Duplex Relay  
Keyword(3) Loopback Self-Interference  
Keyword(4) Inter-Relay Interference  
Keyword(5) Field Pick-up Unit (FPU)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Takuya Kurakake  
1st Author's Affiliation Japan Broadcasting Corporation (NHK)
2nd Author's Name Fumito Ito  
2nd Author's Affiliation Japan Broadcasting Corporation (NHK)
3rd Author's Name Fumiya Yamagishi  
3rd Author's Affiliation Japan Broadcasting Corporation (NHK)
4th Author's Name Kazuhiko Mitsuyama  
4th Author's Affiliation Japan Broadcasting Corporation (NHK)
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Speaker Author-1 
Date Time 2025-11-12 13:50:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2025-153 
Volume (vol) vol.125 
Number (no) no.242 
Page pp.37-42 
#Pages 6 
Date of Issue 2025-11-05 (RCS) 

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