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Paper Abstract and Keywords
Presentation 2020-12-17 11:00
[Encouragement Talk] Massive Grant-Free Non-Orthogonal Multiple Access Utilizing Time and Frequency Spreading
Takanori Hara, Koji Ishibashi (The Univ. of Electro-Communications) RCS2020-134
Abstract (in Japanese) (See Japanese page) 
(in English) To accommodate a large number of users efficiently, grant-free non-orthogonal multiple access (GF-NOMA) has gained much attention. Conventional schemes utilize the non-orthogonal sequences spread over the time domain and perform active user detection (AUD) and channel estimation (CE) via sparse recovery techniques exploiting multiple measurements. However, these approaches require a sufficiently long sequence to accommodate massive users efficiently, leading to difficulties in meeting the latency requirements. In this paper, we propose a new GF-NOMA making full use of time and frequency domains and its parameter design based on phase transition. We demonstrate that our proposed GF-NOMA outperforms the conventional one under the low-latency requirement via computer simulations.
Keyword (in Japanese) (See Japanese page) 
(in English) Grant-free non-orthogonal multiple access / compressed sensing / phase transition / approximate message passing / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 298, RCS2020-134, pp. 1-6, Dec. 2020.
Paper # RCS2020-134 
Date of Issue 2020-12-10 (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 NS RCS  
Conference Date 2020-12-17 - 2020-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
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 2020-12-NS-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Massive Grant-Free Non-Orthogonal Multiple Access Utilizing Time and Frequency Spreading 
Sub Title (in English)  
Keyword(1) Grant-free non-orthogonal multiple access  
Keyword(2) compressed sensing  
Keyword(3) phase transition  
Keyword(4) approximate message passing  
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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 Author-1 
Date Time 2020-12-17 11:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2020-134 
Volume (vol) vol.120 
Number (no) no.298 
Page pp.1-6 
#Pages
Date of Issue 2020-12-10 (RCS) 


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