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Paper Abstract and Keywords
Presentation 2020-11-25 10:40
Superposition Coding-Based Non-orthogonal HARQ with Adaptive Power Allocation Using Multistage Decision
Hironobu Onaya, Kenichi Higuchi (Tokyo Univ. of Science) RCS2020-112
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a superposition coding-based non-orthogonal hybrid automatic repeat request (HARQ) method with adaptive power allocation to the non-orthogonally multiplexed packets by instantaneous channel-dependent multi-stage decisions. In the non-orthogonal HARQ method based on super position coding, retransmission packets are multiplexed with the next initial packet to reduce the throughput loss due to the exclusive bandwidth allocation to the retransmission packets in the conventional method. However, if this method is used in a fixed manner regardless of the channel state, inter-packet interference cannot be eliminated satisfactorily under a poor instantaneous channel condition, and throughput may deteriorate. The proposed method switches the power allocation to the multiplexed packets according to the measured instantaneous channel state. In particular, when the channel state is very poor, the retransmission mode falls back into the conventional orthogonal retransmission by allocating all power to the retransmission packet, which alleviates the throughput loss. The computer simulation results show that the proposed method can improve the throughput performance compared to the cases where orthogonal or non-orthogonal retransmissions are used in a fixed manner.
Keyword (in Japanese) (See Japanese page) 
(in English) Hybrid ARQ / retransmission / superposition coding / / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 249, RCS2020-112, pp. 13-16, Nov. 2020.
Paper # RCS2020-112 
Date of Issue 2020-11-18 (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 RCS2020-112

Conference Information
Committee RCS AP UWT  
Conference Date 2020-11-25 - 2020-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
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 2020-11-RCS-AP-UWT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Superposition Coding-Based Non-orthogonal HARQ with Adaptive Power Allocation Using Multistage Decision 
Sub Title (in English)  
Keyword(1) Hybrid ARQ  
Keyword(2) retransmission  
Keyword(3) superposition coding  
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1st Author's Name Hironobu Onaya  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Kenichi Higuchi  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2020-11-25 10:40:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2020-112 
Volume (vol) vol.120 
Number (no) no.249 
Page pp.13-16 
#Pages 4 
Date of Issue 2020-11-18 (RCS) 

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