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| Paper Abstract and Keywords | ||
| Presentation | 2023-05-25 11:55 Blind Active User Detection for Grant-Free Access in the Presence of Timing Offsets Takanori Hara (Tokyo Univ. of Science)  RCS2023-18 |
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| 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. Although it can support many users while reducing transmission delay significantly thanks to grant-free transmission, the base station has to perform active user detection and channel estimation to recover the transmitted data. Moreover, due to the nature of grant-free transmission, the base station cannot know the activity ratio and all users' large-scale fading coefficients in advance, and it cannot perfectly synchronize with all users in time and frequency. To this end, in this paper, we propose a scheme for performing active user detection and channel estimation without any side information in GF-NOMA under timing offsets. Throughout computer simulations, we demonstrate that the proposed scheme can estimate the channels with comparable accuracy as the conventional one and accurately perform active user detection. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Grant-free access / timing offset / approximate message passing / EM algorithm / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 123, no. 52, RCS2023-18, pp. 23-28, May 2023. | |
| Paper # | RCS2023-18 | |
| Date of Issue | 2023-05-18 (RCS) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and 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) | |
| Download PDF | RCS2023-18 |
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| Conference Information | |
| Committee | RCS IN NV |
| Conference Date | 2023-05-25 - 2023-05-26 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Keio University (Hiyoshi Campus), and online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Ad-Hoc/Sensor Networks/MANET, Mobile Networks, M2M/IoT Communications, Wi-Fi, IEEE802.15(ZigBee) and others |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2023-05-RCS-IN-NV |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Blind Active User Detection for Grant-Free Access in the Presence of Timing Offsets |
| Sub Title (in English) | |
| Keyword(1) | Grant-free access |
| Keyword(2) | timing offset |
| Keyword(3) | approximate message passing |
| Keyword(4) | EM algorithm |
| Keyword(5) | |
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| 1st Author's Name | Takanori Hara |
| 1st Author's Affiliation | Tokyo University of Science (Tokyo Univ. of Science) |
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| Speaker | Author-1 |
| Date Time | 2023-05-25 11:55:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2023-18 |
| Volume (vol) | vol.123 |
| Number (no) | no.52 |
| Page | pp.23-28 |
| #Pages | 6 |
| Date of Issue | 2023-05-18 (RCS) |
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