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Paper Abstract and Keywords
Presentation 2021-10-21 10:25
Performance Evaluation of Scalable Cell-Free Massive MIMO Systems with Multiple CPUs Subject to Backhaul Capacity Limitation
Masaaki Ito, Issei Kanno, Kosuke Yamazaki (KDDI Research), Kengo Ando, Shuto Fukue (UEC), Hiroki Iimori (JUB), Koji Ishibashi (UEC) RCS2021-119
Abstract (in Japanese) (See Japanese page) 
(in English) Cell-free massive multiple-input multiple-output (CF-mMIMO) systems have attracted attention worldwide, being considered as one of the key technologies for the sixth generation wireless communication systems. Although CF-mMIMO systems ideally gather incoming signals received at access points (APs) at a common central processing unit (CPU), this may suffer from overloaded signal processing as the service area expands, implying the need of inter-CPU cooperation among multiple CPUs for load balancing. In this case, one of the non-negligible issues of inter-CPU cooperation is the quantization error due to the limited backhaul links utilized to exchange information among them. In this paper, we evaluate the system performance of CF-mMIMO systems composed of multiple CPUs, revealing the superiority of the latter in comparison with cellular distributed MIMO counterparts, in which each CPU operates independently.
Keyword (in Japanese) (See Japanese page) 
(in English) 6G / cell-free massive MIMO / multiple CPUs / distributed MIMO / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 210, RCS2021-119, pp. 7-12, Oct. 2021.
Paper # RCS2021-119 
Date of Issue 2021-10-14 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS2021-119

Conference Information
Committee RCS  
Conference Date 2021-10-21 - 2021-10-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, Future Wireless Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2021-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance Evaluation of Scalable Cell-Free Massive MIMO Systems with Multiple CPUs Subject to Backhaul Capacity Limitation 
Sub Title (in English)  
Keyword(1) 6G  
Keyword(2) cell-free massive MIMO  
Keyword(3) multiple CPUs  
Keyword(4) distributed MIMO  
1st Author's Name Masaaki Ito  
1st Author's Affiliation KDDI Research, Inc. (KDDI Research)
2nd Author's Name Issei Kanno  
2nd Author's Affiliation KDDI Research, Inc. (KDDI Research)
3rd Author's Name Kosuke Yamazaki  
3rd Author's Affiliation KDDI Research, Inc. (KDDI Research)
4th Author's Name Kengo Ando  
4th Author's Affiliation The University of Electro-Communications (UEC)
5th Author's Name Shuto Fukue  
5th Author's Affiliation The University of Electro-Communications (UEC)
6th Author's Name Hiroki Iimori  
6th Author's Affiliation Jacobs University Bremen (JUB)
7th Author's Name Koji Ishibashi  
7th Author's Affiliation The University of Electro-Communications (UEC)
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Date Time 2021-10-21 10:25:00 
Presentation Time 25 
Registration for RCS 
Paper # RCS2021-119 
Volume (vol) 121 
Number (no) no.210 
Page pp.7-12 
Date of Issue 2021-10-14 (RCS) 

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