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Paper Abstract and Keywords
Presentation 2022-06-16 10:10
Iterative Active User Detection for Grant-Free Non-Orthogonal Multiple Access in The Presence of Carrier Frequency Offsets
Kohei Ueda (UEC), Takanori Hara (TUS), Koji Ishibashi (UEC) RCS2022-43
Abstract (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access (GF-NOMA) systems suffer from the performance degradation of active user detection (AUD) due to carrier frequency offsets (CFOs) since a perfect frequency synchronization among all the users and base station is practically difficult. A conventional method performs CFO estimation, AUD, and channel estimation (CE) by introducing extended pilot sequences based on discrete grids of the CFOs. However, the dimension of the problem with the extended pilot sequences quadratically grows with the size of CFO. In this paper, we propose a method for AUD, CE and CFO estimation without increasing the estimated dimension for the estimation by performing AUD and CFO estimation independently and iteratively. Computer simulations demonstrate that our proposed scheme can estimate the active users and the corresponding channel coefficients as accurately as the case with the ideal knowledge of the CFOs.
Keyword (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access, / active user detection / carrier frequency offsets, / bisection method / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 73, RCS2022-43, pp. 114-119, June 2022.
Paper # RCS2022-43 
Date of Issue 2022-06-08 (RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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  
Conference Date 2022-06-15 - 2022-06-17 
Place (in Japanese) (See Japanese page) 
Place (in English) University of the Ryukyus, Senbaru Campus and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2022-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Iterative Active User Detection for 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 offsets,  
Keyword(4) bisection method  
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1st Author's Name Kohei Ueda  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Takanori Hara  
2nd Author's Affiliation Tokyo University of Science (TUS)
3rd Author's Name Koji Ishibashi  
3rd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2022-06-16 10:10:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2022-43 
Volume (vol) vol.122 
Number (no) no.73 
Page pp.114-119 
#Pages
Date of Issue 2022-06-08 (RCS) 


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