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Paper Abstract and Keywords
Presentation 2021-10-21 14:15
A Study on Intelligent Reflecting Surface (IRS) Aided Cell-Free Network -- IRS Reflection Coefficients Optimization by Quantum Computing for MIMO Channel Capacity Maximization --
Takahiro Ohyama (PSNRD), Yuichi Kawamoto, Nei Kato (Tohoku Univ.) RCS2021-125
Abstract (in Japanese) (See Japanese page) 
(in English) The IRS (Intelligent Reflecting Surface), which enables control of propagation characteristics, is attracting attention as a technology that greatly improves energy utilization efficiency in 6th generation mobile communication systems. In addition, cell-free networks are being actively researched as a new network architecture that solves the problem of inter-cell interference in conventional cellular networks. In this report, we consider a cell-free network that includes the IRS. We propose a QUBO formulation to optimize IRS reflection coefficients by quantum computing when performing MIMO communication with users in a shadowing environment. The simulation results show the effectiveness of the proposed QUBO formulation and clarify that MIMO can achieve more efficient communication than OFDMA and TDMA.
Keyword (in Japanese) (See Japanese page) 
(in English) Intelligent Reflecting Surface (IRS) / Cell-Free Network / Reflection Coefficients Optimization / Quantum Computing / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 210, RCS2021-125, pp. 43-48, Oct. 2021.
Paper # RCS2021-125 
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 RCS2021-125

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) A Study on Intelligent Reflecting Surface (IRS) Aided Cell-Free Network 
Sub Title (in English) IRS Reflection Coefficients Optimization by Quantum Computing for MIMO Channel Capacity Maximization 
Keyword(1) Intelligent Reflecting Surface (IRS)  
Keyword(2) Cell-Free Network  
Keyword(3) Reflection Coefficients Optimization  
Keyword(4) Quantum Computing  
1st Author's Name Takahiro Ohyama  
1st Author's Affiliation Panasonic System Networks R&D Lab. Co., Ltd. (PSNRD)
2nd Author's Name Yuichi Kawamoto  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Nei Kato  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2021-10-21 14:15:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2021-125 
Volume (vol) vol.121 
Number (no) no.210 
Page pp.43-48 
Date of Issue 2021-10-14 (RCS) 

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