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Paper Abstract and Keywords
Presentation 2025-11-07 09:50
[Invited Talk] Impact on Non-linear Amplification in Satellite Broadcasting System
Masaaki Kojima, Yuki Koizumi, Masashi Kamei (NHK) SAT2025-56
Abstract (in Japanese) (See Japanese page) 
(in English) The transmission standard for 4K8K satellite broadcasting (ISDB-S3) in Japan has newly adopted APSK modulation schemes in addition to conventional PSKs. Since the launch of commercial broadcasting services in December 2018, 16APSK has been employed, enabling the transmission of one 8K program or three 4K programs per channel. Although APSKs enable higher spectral efficiency, it is more vulnerable to distortion. The typical satellite transponder consists of an input multiplexer (IMUX) filter, traveling wave tube amplifier (TWTA), and output multiplexer (OMUX) filter. Amplitude and group delay variations within the Nyquist bandwidth of the IMUX and OMUX filters induce linear distortion in the modulated signal, while gain compression and phase rotation caused by TWTA due to high power efficient operation induce nonlinear distortion. We have optimized transmission performance by considering the trade-off between the required C/N and output power of the satellite transponder, and proposed a compensation method using digital pre-distortion (DPD). Through computer simulations and transmission experiments, we have demonstrated the effectiveness of the proposed method in improving transmission performance. In this presentation, we present an overview of our previous work.
Keyword (in Japanese) (See Japanese page) 
(in English) ISDB-S3 / APSK / Satellite Transponder / Digital Pre-distortion / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 227, SAT2025-56, pp. 30-30, Nov. 2025.
Paper # SAT2025-56 
Date of Issue 2025-10-30 (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 SAT2025-56

Conference Information
Committee SAT KOSST  
Conference Date 2025-11-06 - 2025-11-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel Sunshine (Korea, Daejeon) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite communication technology, etc. (JC-SAT 2025 co-hosted by IEICE and KOSST) 
Paper Information
Registration To SAT 
Conference Code 2025-11-SAT-KOSST 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Impact on Non-linear Amplification in Satellite Broadcasting System 
Sub Title (in English)  
Keyword(1) ISDB-S3  
Keyword(2) APSK  
Keyword(3) Satellite Transponder  
Keyword(4) Digital Pre-distortion  
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1st Author's Name Masaaki Kojima  
1st Author's Affiliation Japan Broadcasting Corporation (NHK)
2nd Author's Name Yuki Koizumi  
2nd Author's Affiliation Japan Broadcasting Corporation (NHK)
3rd Author's Name Masashi Kamei  
3rd Author's Affiliation Japan Broadcasting Corporation (NHK)
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Speaker Author-1 
Date Time 2025-11-07 09:50:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2025-56 
Volume (vol) vol.125 
Number (no) no.227 
Page p.30 
#Pages 1 
Date of Issue 2025-10-30 (SAT) 

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