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Paper Abstract and Keywords
Presentation 2019-12-19 09:15
A Study on Active User Detection and Channel Estimation for Grant-Free Non-Orthogonal Multiple Access based on OFDM
Takanori Hara, Koji Ishibashi (The Univ. of Electro-Communications) RCS2019-237
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 multiple measurement vector approximate message passing (MMV-AMP), has been proposed. This scheme can efficiently perform active user detection (AUD), channel estimation (CE), and data detection by exploiting multiple measurements. However, the scheme cannot detect the transmitted data correctly when the channels vary in the duration of the transmission since the pilot and data symbols are transmitted with multiplying the spreading sequence. In this paper, we consider GF-NOMA systems exploiting orthogonal frequency division multiplexing (OFDM). We also propose a scheme to perform AUD and CE using multiple sabcarriers. Furthermore, we show that our proposal can attain superior performance via computer simulations.
Keyword (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access / active user detection / compressed sensing / approximate message passing / / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 345, RCS2019-237, pp. 1-5, Dec. 2019.
Paper # RCS2019-237 
Date of Issue 2019-12-12 (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 NS RCS  
Conference Date 2019-12-19 - 2019-12-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Memorial Hall of Alumni(Engineering), Tokushima Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Multi-hop/Relay/Cooperation, Disaster-resistant wireless network, Sensor/Mesh network, Ad-hoc network, D2D/M2M, Wireless network coding, Handover/AP switching/Connected cell control/Load balancing among base stations/Mobile network dynamic reconfiguration, QoS/QoE assurance, Wireless VoIP, IoT, Edge computing, etc. 
Paper Information
Registration To RCS 
Conference Code 2019-12-NS-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Active User Detection and Channel Estimation for Grant-Free Non-Orthogonal Multiple Access based on OFDM 
Sub Title (in English)  
Keyword(1) Grant-free non-orthogonal multiple access  
Keyword(2) active user 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 2019-12-19 09:15:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2019-237 
Volume (vol) IEICE-119 
Number (no) no.345 
Page pp.1-5 
#Pages IEICE-5 
Date of Issue IEICE-RCS-2019-12-12 

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