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Paper Abstract and Keywords
Presentation 2025-03-07 10:55
Prototype RF Front-End of 2.15 GHz In-Band Full-Duplex Radio with Shared-LO and Low-IF Architecture and Its Basic Evaluation
Kazuki Komatsu (Toyohashi Univ. of Tech./NICT), Hideyuki Uehara (Toyohashi Univ. of Tech.), Takeshi Matsumura (NICT) RCS2024-291
Abstract (in Japanese) (See Japanese page) 
(in English) In-band full-duplex communication improves frequency utilization efficiency. However, its implementation requires the cancellation mechanism of self-interference (SI). Since SI undergoes nonlinear effects in the amplifiers of transmitters and receivers, digital nonlinear SI cancellers have been developed. This report organizes the key considerations when designing RF front-ends for in-band full-duplex systems and highlights significant issues such as phase noise from local oscillators and nonlinear distortion characteristics of receivers. To address these challenges, we prototyped a 2.15 GHz in-band full-duplex experimental system using a low-IF (intermediate frequency) and shared-LO (local oscillator) architecture, and we present the evaluation results. The evaluation of the nonlinear SI canceller in the prototype demonstrated an SI cancellation performance of 57.9 dB. Additionally, it is shown that the low-IF and shared-LO architecture are effective for constructing RF front-ends for in-band full-duplex systems. Also, it is demonstrated that the limit of the digital SI canceller's performance can be estimated by measuring the loopback phase noise.
Keyword (in Japanese) (See Japanese page) 
(in English) In-Band Full-Duplex / Digital Self-Interference Cancellation / Shared Local Oscillator / Low-IF Architecture / / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 409, RCS2024-291, pp. 170-175, March 2025.
Paper # RCS2024-291 
Date of Issue 2025-02-26 (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)
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Conference Information
Committee RCS SR SRW  
Conference Date 2025-03-05 - 2025-03-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2025-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Prototype RF Front-End of 2.15 GHz In-Band Full-Duplex Radio with Shared-LO and Low-IF Architecture and Its Basic Evaluation 
Sub Title (in English)  
Keyword(1) In-Band Full-Duplex  
Keyword(2) Digital Self-Interference Cancellation  
Keyword(3) Shared Local Oscillator  
Keyword(4) Low-IF Architecture  
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Keyword(6)  
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Keyword(8)  
1st Author's Name Kazuki Komatsu  
1st Author's Affiliation Toyohashi University of Technology/National Institute of Information and Communications Technology (Toyohashi Univ. of Tech./NICT)
2nd Author's Name Hideyuki Uehara  
2nd Author's Affiliation Toyohashi University of Technology/National Institute of Information and Communication Technology (Toyohashi Univ. of Tech.)
3rd Author's Name Takeshi Matsumura  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2025-03-07 10:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2024-291 
Volume (vol) vol.124 
Number (no) no.409 
Page pp.170-175 
#Pages 6 
Date of Issue 2025-02-26 (RCS) 

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