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Paper Abstract and Keywords
Presentation 2019-03-07 09:25
Parameter Estimation for Block Diagonalization based Beamforming in Analog-Digital-Hybrid Massive MIMO Systems
Kenta Tsuge, Yuyuan Chang, Kazuhiko Fukawa (Tokyo Tech), Satoshi Suyama, Yukihiko Okumura (NTT DOCOMO) RCS2018-312
Abstract (in Japanese) (See Japanese page) 
(in English) For massive MIMO systems to be employed in the 5th generation mobile communications (5G), hybrid beamforming (HB), which is composed of the analog beamforming (AB) and the digital beamforming (DB), has been investigated because HB can decrease the number of baseband and RF circuits significantly and thus can reduce a much larger amount of the cost and power consumption than the full DB (FD) configuration, which requires one baseband and RF circuits for each antenna element. This report proposes a scheme to estimate both phases for phase rotators in AB and a precoding matrix for DB so that they can realize the block diagonalization (BD). Due to BD, HB can null interference from the undesired users and can form efficient transmit beams with low computational complexity.For time division duplex (TDD) multiuser MIMO communications, the proposed scheme estimates the FD channel matrix in the uplink (UL) and the phase for the phase rotators of AB in the downlink (DL).After obtaining an equivalent channel matrix from the estimated FD channel matrix and AB precoding matrix, the scheme estimates the DB precoding matrix in DL from the equivalent channel matrix so that HB can achieve BD in DL.Computer simulations demonstrate that the proposed scheme can achieve DL average bit error rate (BER) performances that are little inferior to those of FD.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / massive MIMO / hybrid beamforming / channel estimation / block diagonalization / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 474, RCS2018-312, pp. 157-162, March 2019.
Paper # RCS2018-312 
Date of Issue 2019-02-27 (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 RCS2018-312

Conference Information
Committee RCS SR SRW  
Conference Date 2019-03-06 - 2019-03-08 
Place (in Japanese) (See Japanese page) 
Place (in English) YRP 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2019-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Parameter Estimation for Block Diagonalization based Beamforming in Analog-Digital-Hybrid Massive MIMO Systems 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) massive MIMO  
Keyword(3) hybrid beamforming  
Keyword(4) channel estimation  
Keyword(5) block diagonalization  
1st Author's Name Kenta Tsuge  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Yuyuan Chang  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Kazuhiko Fukawa  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Satoshi Suyama  
4th Author's Affiliation NTT DOCOMO,INC. (NTT DOCOMO)
5th Author's Name Yukihiko Okumura  
5th Author's Affiliation NTT DOCOMO,INC. (NTT DOCOMO)
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Date Time 2019-03-07 09:25:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2018-312 
Volume (vol) IEICE-118 
Number (no) no.474 
Page pp.157-162 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2019-02-27 

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