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Paper Abstract and Keywords
Presentation 2023-07-12 10:00
Scalable Clustering Method in Downlink Cell-Free MIMO Using Layered Partially Non-orthogonal ZF-Based Beamforming
Daisuke Ishii, Takanori Hara, Kenichi Higuchi (Tokyo Univ. of Science) RCS2023-79
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we investigate a method for clustering UE-specific transmission TRPs in downlink cell-free multi-input multi-output (MIMO) assuming that the transmission reception points (TRPs) distributed over the system coverage know only part of instantaneous channel state information (CSI). As a beamforming (BF) method based on partial CSI, the conventional method utilizes a layered partially non-orthogonal zero forcing (ZF) method and selects transmitting TRP groups based on the estimates of received power after BF and interference power to increase system throughput. However, it is difficult for the conventional method to keep the scalability since the method calculates the metric considering all UEs in system coverage and updates transmitting TRP groups in order. Therefore, we propose a method that selects suitable transmitting TRP groups while reducing the computational complexity of the calculation of the metric. The proposed method calculates the metric for each UE only considering the UE cluster that comprises near UEs. Computer simulations demonstrate that the proposed method can achieve high geometric-mean and worst user throughput while keeping the scalability.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / cell-free MIMO / inter-base cooperation / transmitter selection / beamforming / partial CSI / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 108, RCS2023-79, pp. 1-6, July 2023.
Paper # RCS2023-79 
Date of Issue 2023-07-05 (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 RCS2023-79

Conference Information
Committee SeMI RCS RCC NS SR  
Conference Date 2023-07-12 - 2023-07-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka University Nakanoshima Center + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Distributed Wireless Network, M2M (Machine-to-Machine)，D2D (Device-to-Device)，IoT（Internet of Things）, etc 
Paper Information
Registration To RCS 
Conference Code 2023-07-SeMI-RCS-RCC-NS-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Scalable Clustering Method in Downlink Cell-Free MIMO Using Layered Partially Non-orthogonal ZF-Based Beamforming 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) cell-free MIMO  
Keyword(3) inter-base cooperation  
Keyword(4) transmitter selection  
Keyword(5) beamforming  
Keyword(6) partial CSI  
Keyword(7)  
Keyword(8)  
1st Author's Name Daisuke Ishii  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Takanori Hara  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Kenichi Higuchi  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2023-07-12 10:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2023-79 
Volume (vol) vol.123 
Number (no) no.108 
Page pp.1-6 
#Pages 6 
Date of Issue 2023-07-05 (RCS) 

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