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Paper Abstract and Keywords
Presentation 2022-10-07 14:05
Initial Study on Decoding Methods of LDM Transmission for Satellite Broadcasting System
Yuki Koizumi, Masashi Kamei (NHK) SAT2022-53
Abstract (in Japanese) (See Japanese page) 
(in English) We are developing a satellite broadcasting system featuring layered division multiplexing (LDM) transmission that multiplexes multiple modulation signals with different power levels (injection levels (IL)) in the same channel with the aim of providing flexible services in accordance with the receiving environment. LDM consists of an upper layer (UL) with high power and a lower layer (LL) with low power, the combination of which enables the transmission of signals with different bit rates and levels of robustness in the same channel.
In this report, we present the decoding methods for UL and LL signals in LDM for a satellite broadcasting system. For the UL signal, two methods are described: one that assume the LL signal as a noise and the other that consider the constellation of the LDM signal combining UL and LL signals. For the LL signal, we propose a method that does not require the UL replica signal generation and subtraction process performed by successive interference cancellation (SIC), a general method to extract an LL signal from a received LDM signal. The proposed method as reference selection (RS) is expected to reduce the computational complexity of the log-likelihood ratio (LLR), a bit certainty used in LDPC decoding. We evaluate the transmission performance of each decoding method for the UL and LL signals by computer simulation and discuss the receiver complexity in these methods including the proposed method.
Keyword (in Japanese) (See Japanese page) 
(in English) Layered division multiplexing / Satellite broadcasting / Successive interference cancellation / LDPC / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 199, SAT2022-53, pp. 45-49, Oct. 2022.
Paper # SAT2022-53 
Date of Issue 2022-09-29 (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)
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Conference Information
Committee SAT KOSST  
Conference Date 2022-10-06 - 2022-10-07 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
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Paper Information
Registration To SAT 
Conference Code 2022-10-SAT-KOSST 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Initial Study on Decoding Methods of LDM Transmission for Satellite Broadcasting System 
Sub Title (in English)  
Keyword(1) Layered division multiplexing  
Keyword(2) Satellite broadcasting  
Keyword(3) Successive interference cancellation  
Keyword(4) LDPC  
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1st Author's Name Yuki Koizumi  
1st Author's Affiliation NHK (NHK)
2nd Author's Name Masashi Kamei  
2nd Author's Affiliation NHK (NHK)
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Speaker Author-1 
Date Time 2022-10-07 14:05:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2022-53 
Volume (vol) vol.122 
Number (no) no.199 
Page pp.45-49 
#Pages 5 
Date of Issue 2022-09-29 (SAT) 

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