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Paper Abstract and Keywords
Presentation 2019-11-20 13:35
A Study on Low-Complexity Data Detection for Grant-Free Non-Orthogonal Multiple Access
Takanori Hara, Koji Ishibashi (The Univ. of Electro-Communications) RCS2019-211
Abstract (in Japanese) (See Japanese page) 
(in English) As a scheme to accommodate a large number of users efficiently, the grant-free non-orthogonal multiple access (GF-NOMA) based on boosted approximate message passing (Boosted AMP), has been proposed. This scheme converts the original reconstruction problem into the smaller sized one by multiplying random matrices and perform the channel estimation (CE) and date detection via minimum mean-squared error (MMSE) estimation after the active user detection (AUD). However, the performance degrades owing to the problem conversion, and the computational complexity of MMSE estimation is still high. In this paper, we propose the modified problem conversion to perform AUD and CE jointly and reduce the complexity of data detection by exploiting the conjugate gradient method. Furthermore, we show that our proposal can attain superior performance than the conventional scheme by modifying the threshold for AUD, while its computational complexity decreases.
Keyword (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access / data detection / compressed sensing / approximate message passing / / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 296, RCS2019-211, pp. 49-54, Nov. 2019.
Paper # RCS2019-211 
Date of Issue 2019-11-13 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 AP RCS  
Conference Date 2019-11-20 - 2019-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Saga Univ. 
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 2019-11-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Low-Complexity Data Detection for Grant-Free Non-Orthogonal Multiple Access 
Sub Title (in English)  
Keyword(1) Grant-free non-orthogonal multiple access  
Keyword(2) data detection  
Keyword(3) compressed sensing  
Keyword(4) approximate message passing  
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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Date Time 2019-11-20 13:35:00 
Presentation Time 25 
Registration for RCS 
Paper # RCS2019-211 
Volume (vol) 119 
Number (no) no.296 
Page pp.49-54 
Date of Issue 2019-11-13 (RCS) 

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