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Paper Abstract and Keywords
Presentation 2020-01-24 16:40
Active User Detection for Uplink Grant-Free Non-Orthogonal Multiple Access in The Presence of Carrier Frequency Offsets
Takanori Hara, Koji Ishibashi (The Univ. of Electro-Communications) IT2019-89 SIP2019-102 RCS2019-319
Abstract (in Japanese) (See Japanese page) 
(in English) Practically, it is significantly difficult to assume that carrier frequencies are ideally synchronized among users, and these offsets cause the severe degradation of the performance of active user detection (AUD). Conventional method performs the AUD effectively even in the presence of carrier frequency offset (CFO) utilizing Taylor approximation and block coordinate descent method. However, this method requires the maximal number of active users as a prior information while this assumption is not reasonable for grant-free access in which users transmit autonomously. Besides, since the performance degrades as the number of potential users increases, this conventional scheme is not appropriate to accommodate massive users which is a main target of grant-free access. In this paper, we propose new AUD, which does not need any a prior information unlike the conventional scheme. Our proposal utilizes coordinate descent method and a peek estimation method for angle-of-arrival. Computer simulations confirm the proposed scheme can estimate the active users accurately.
Keyword (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access / active user detection / carrier frequency offset / coordinate descent method / / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 378, RCS2019-319, pp. 313-317, Jan. 2020.
Paper # RCS2019-319 
Date of Issue 2020-01-16 (IT, SIP, RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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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 IT2019-89 SIP2019-102 RCS2019-319

Conference Information
Committee IT SIP RCS  
Conference Date 2020-01-23 - 2020-01-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima City Youth Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2020-01-IT-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Active User Detection for Uplink Grant-Free Non-Orthogonal Multiple Access in The Presence of Carrier Frequency Offsets 
Sub Title (in English)  
Keyword(1) Grant-free non-orthogonal multiple access  
Keyword(2) active user detection  
Keyword(3) carrier frequency offset  
Keyword(4) coordinate descent method  
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1st Author's Name Takanori Hara  
1st Author's Affiliation The University of Electro-Communications (The Univ. of Electro-Communications)
2nd Author's Name Koji Ishibashi  
2nd Author's Affiliation The University of Electro-Communications (The Univ. of Electro-Communications)
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Speaker
Date Time 2020-01-24 16:40:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-IT2019-89,IEICE-SIP2019-102,IEICE-RCS2019-319 
Volume (vol) IEICE-119 
Number (no) no.376(IT), no.377(SIP), no.378(RCS) 
Page pp.313-317 
#Pages IEICE-5 
Date of Issue IEICE-IT-2020-01-16,IEICE-SIP-2020-01-16,IEICE-RCS-2020-01-16 


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