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Paper Abstract and Keywords
Presentation 2013-11-20 14:00
Comparison of Beamforming Matrix Control Methods in Base Station Cooperative Multiuser MIMO Using Block-Diagonalized Beamforming Matrix
Nobuhide Nonaka (Tokyo Univ. of Science), Yuichi Kakishima (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2013-176
Abstract (in Japanese) (See Japanese page) 
(in English) This paper investigates beamforming control method in the base station (BS) cooperative multiuser multiple-input multiple-output (MIMO) transmission assuming block-diagonalized unitary beamforming matrix. More specifically, we comprehensively compare the open-loop type random (opportunistic) beamforming control with the codebook-based closed-loop type beamforming control. The proportional fair (PF)-based scheduling is assumed, and the number of users, codebook size, and delay time of feedback signal from the user terminals are taken into account in the comparison. From the numerical results, the codebook-based beamforming control with large codebook size achieves higher system throughput than the random beamforming when the number of users is small and the feedback delay is short. However, we show that when the number of users is large and the feedback delay is long, the random beamforming can achieve higher system-level throughput than the codebook-based beamforming. This implies that the transmission rate control with random beamforming is more robust against the channel variation than that with codebook-based beamforming. These results suggest that the random beamforming which require lower feedback overhead than the codebook-based beamforming is a promising beamforming strategy in future radio access.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / Multiuser MIMO / Base station cooperation / Random beamforming / Codebook / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 301, RCS2013-176, pp. 13-18, Nov. 2013.
Paper # RCS2013-176 
Date of Issue 2013-11-13 (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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2013-176

Conference Information
Committee RCS AP  
Conference Date 2013-11-20 - 2013-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Matsue Terrsa 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceller, MIMO, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2013-11-RCS-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of Beamforming Matrix Control Methods in Base Station Cooperative Multiuser MIMO Using Block-Diagonalized Beamforming Matrix 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) Multiuser MIMO  
Keyword(3) Base station cooperation  
Keyword(4) Random beamforming  
Keyword(5) Codebook  
1st Author's Name Nobuhide Nonaka  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yuichi Kakishima  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Kenichi Higuchi  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Date Time 2013-11-20 14:00:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2013-176 
Volume (vol) IEICE-113 
Number (no) no.301 
Page pp.13-18 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2013-11-13 

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