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| Presentation | 2021-08-26 11:50 Two-Stage Precoding with Null-Steering for Spectrum Sharing between HAPS and Terrestrial Systems Koji Tashiro, Kenji Hoshino, Atsushi Nagate (SoftBank)  RCS2021-101 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Coverage extension to the sky, seas, and mountains is one of the important concepts of the sixth generation (6G) mobile communications. High-altitude platform stations (HAPS) have attracted much attention as a leading candidate for the coverage extension. In terms of spectrum sharing, it is preferable for HAPS systems to utilize the same frequency band as that used in terrestrial mobile networks. However, the signals from HAPS strongly interfere with the communications between a terrestrial base station (BS) and the users connected to the BS, which leads to serious deterioration in the system capacity of terrestrial networks. This paper proposes a two-stage precoding scheme for spectrum sharing between HAPS and terrestrial systems, where null points toward terrestrial BSs are created in the first stage, and multiple beams toward users are formed in the second one. Results show that the proposed scheme improves signal-to-interference-plus-noise ratio of terrestrial systems by about 7 dB compared with a conventional beamforming scheme without null-steering. Moreover, the proposed scheme achieves about 24% as high performance as the conventional one in terms of the sum capacity of HAPS and terrestrial systems. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | high-altitude platform station (HAPS) / null-steering / service link / spectrum sharing / 6G / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 153, RCS2021-101, pp. 13-18, Aug. 2021. | |
| Paper # | RCS2021-101 | |
| Date of Issue | 2021-08-19 (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 | RCS2021-101 |
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| Conference Information | |
| Committee | RCS SAT |
| Conference Date | 2021-08-26 - 2021-08-27 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2021-08-RCS-SAT |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Two-Stage Precoding with Null-Steering for Spectrum Sharing between HAPS and Terrestrial Systems |
| Sub Title (in English) | |
| Keyword(1) | high-altitude platform station (HAPS) |
| Keyword(2) | null-steering |
| Keyword(3) | service link |
| Keyword(4) | spectrum sharing |
| Keyword(5) | 6G |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Koji Tashiro |
| 1st Author's Affiliation | SoftBank Corp. (SoftBank) |
| 2nd Author's Name | Kenji Hoshino |
| 2nd Author's Affiliation | SoftBank Corp. (SoftBank) |
| 3rd Author's Name | Atsushi Nagate |
| 3rd Author's Affiliation | SoftBank Corp. (SoftBank) |
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| Speaker | Author-1 |
| Date Time | 2021-08-26 11:50:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2021-101 |
| Volume (vol) | vol.121 |
| Number (no) | no.153 |
| Page | pp.13-18 |
| #Pages | 6 |
| Date of Issue | 2021-08-19 (RCS) |
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