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| Presentation | 2021-01-21 14:00 A Study of Pilot Assignment Optimization Based on Statistical Beam Selection for Large Multi-User MIMO Yuichi Ochi, Takumi Takahashi (Osaka Univ.), Shinsuke Ibi (Doshisha Univ.), Seiichi Sampei (Osaka Univ.)  IT2020-78 SIP2020-56 RCS2020-169 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | We propose a novel pilot assignment optimization scheme based on statistical beam selection for significant pilot overhead reduction in large multi-user multi-input multi-output (MU-MIMO) systems. In the uplink large MU-MIMO scenarios, accurate channel estimation plays a vital role in separating the multiplexed signals at the receiver. However, the use of orthogonal pilots induces an increase of channel acquisition overhead with the increase in the number of simultaneously connected user terminals, resulting in the reduced data transmission efficiency. To address this issue, we focus on the pseudo-sparsity of beam-domain channels, which is caused by the limited angler spread of received signals when the receive fully-digital beamforming is used at the base station (BS). When the long-term channel statistics are available at the BS, the selection criterion for statistical beams to be used for channel estimation can be designed based on the sparsity. By leveraging the signal space consists of non-selected beams, the same pilots can be assigned to spatially separated user terminals while maintaining high channel estimation accuracy. Computer simulations demonstrate the validity of our proposed method in terms of mean square error (MSE) performance in large multi-user MIMO systems with short non-orthogonal pilots. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Large multi-user MIMO / Channel estimation / Outer beamforming / Non-orthogonal pilot / Discrete optimization / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 120, no. 322, RCS2020-169, pp. 87-92, Jan. 2021. | |
| Paper # | RCS2020-169 | |
| Date of Issue | 2021-01-14 (IT, SIP, 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 | IT2020-78 SIP2020-56 RCS2020-169 |
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| Conference Information | |
| Committee | SIP IT RCS |
| Conference Date | 2021-01-21 - 2021-01-22 |
| 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 | 2021-01-SIP-IT-RCS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study of Pilot Assignment Optimization Based on Statistical Beam Selection for Large Multi-User MIMO |
| Sub Title (in English) | |
| Keyword(1) | Large multi-user MIMO |
| Keyword(2) | Channel estimation |
| Keyword(3) | Outer beamforming |
| Keyword(4) | Non-orthogonal pilot |
| Keyword(5) | Discrete optimization |
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| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Yuichi Ochi |
| 1st Author's Affiliation | Osaka University (Osaka Univ.) |
| 2nd Author's Name | Takumi Takahashi |
| 2nd Author's Affiliation | Osaka University (Osaka Univ.) |
| 3rd Author's Name | Shinsuke Ibi |
| 3rd Author's Affiliation | Doshisha University (Doshisha Univ.) |
| 4th Author's Name | Seiichi Sampei |
| 4th Author's Affiliation | Osaka University (Osaka Univ.) |
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| Speaker | Author-1 |
| Date Time | 2021-01-21 14:00:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | IT2020-78, SIP2020-56, RCS2020-169 |
| Volume (vol) | vol.120 |
| Number (no) | no.320(IT), no.321(SIP), no.322(RCS) |
| Page | pp.87-92 |
| #Pages | 6 |
| Date of Issue | 2021-01-14 (IT, SIP, RCS) |
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