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| Presentation | 2022-08-25 11:40 A Study on Computational Complexity Reduction of Pre/Postcoding in User-Cluster-Centric CF-mMIMO Ryo Takahashi, Hidenori Matsuo, Sijie Xia, Qiang Chen, Fumiyuki Adachi (Tohoku Univ.)  RCS2022-101 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Cell-Free massive MIMO (CF-mMIMO), which cooperatively utilizes a large number of antennas deployed over a wide communication area, has been attracting attention as a key technology for Beyond 5G systems. Previously, we have proposed a user-cluster-centric CF-mMIMO (UCC-CF-mMIMO) which can both ensure the system scalability and improve the system capacity in a high user density environment. UCC-CF-mMIMO performs multi-user MIMO (MU-MIMO) spatial multiplexing by grouping neighboring users into user clusters and selecting multiple antennas common to all users in each cluster. Inter-cluster interference can be reduced by directly considering the correlation matrix of the MIMO channel between the selected antennas of user-cluster of interest and the users in the interfering clusters in the MU-MIMO pre/postcoding of user cluster of interest. The use of channel correlation matrix makes it possible to form nulls toward interfering users, thereby improving the interference suppression effect, however, the computational complexity of pre/postcoding increases as the number of interfering users increases. In this paper, we propose a low-complexity pre/postcoding in which the channel correlation matrix is directly used for the predominant interfering users, while the sum of other inter-cluster interfering signals is approximated as an equivalent Gaussian noise (therefore, the measurement of interference power is only necessary for other interfering users). The interference reduction and the computational complexity are discussed by evaluating the user link capacities achievable with the conventional and proposed pre/postcoding schemes through computer simulation. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | CF-mMIMO / user-cluster-centric / pre/postcoding / low complexity / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 122, no. 164, RCS2022-101, pp. 24-29, Aug. 2022. | |
| Paper # | RCS2022-101 | |
| Date of Issue | 2022-08-18 (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 | RCS2022-101 |
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| Conference Information | |
| Committee | SAT RCS |
| Conference Date | 2022-08-25 - 2022-08-26 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2022-08-SAT-RCS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Computational Complexity Reduction of Pre/Postcoding in User-Cluster-Centric CF-mMIMO |
| Sub Title (in English) | |
| Keyword(1) | CF-mMIMO |
| Keyword(2) | user-cluster-centric |
| Keyword(3) | pre/postcoding |
| Keyword(4) | low complexity |
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| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Ryo Takahashi |
| 1st Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 2nd Author's Name | Hidenori Matsuo |
| 2nd Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 3rd Author's Name | Sijie Xia |
| 3rd Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 4th Author's Name | Qiang Chen |
| 4th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 5th Author's Name | Fumiyuki Adachi |
| 5th Author's Affiliation | Tohoku University (Tohoku Univ.) |
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| Speaker | Author-1 |
| Date Time | 2022-08-25 11:40:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2022-101 |
| Volume (vol) | vol.122 |
| Number (no) | no.164 |
| Page | pp.24-29 |
| #Pages | 6 |
| Date of Issue | 2022-08-18 (RCS) |
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