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Paper Abstract and Keywords
Presentation 2015-03-05 09:00
Influence of Analog Beamforming Configuration on Massive MIMO with Hybrid Beamforming in High Frequency Bands
Satoshi Suyama, Tatsunori Obara, Jiyun Shen, Yukihiko Okumura (NTT DOCOMO) RCS2014-337
Abstract (in Japanese) (See Japanese page) 
(in English) In order to tackle rapidly increasing traffic, 5th generation (5G) radio access network in mobile communications introduces Massive MIMO technology into small cells using higher frequency bands, and super high bit rate transmission realizing more than 10 Gbps data rate has been investigated. In Massive MIMO, from the point of view of realization, hybrid beamforming (BF) that combines analog BF with digital precoding has been proposed, and it has been verified that a throughput of more than 20 Gbps can be achieved by using 400 MHz bandwidth in the 20 GHz band and employing full-array type analog BF with all the antenna elements. In this report, we employ a sub-array type configuration using subsets of the antenna elements in our proposed joint analog BF and channel state information (CSI)-based precoding (FBCP), and present a beam search algorithm for such a configuration. Performances comparison between the full-array type and the sub-array type are made by link level simulations using 256-element uniform planar array. Furthermore, for the more realistic evaluation, some performances are shown by taking into account a phase error in both the variable phase shifter of the analog BF and the 90 degrees phase shifter of the quadrature modulator as hardware impairment.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / Higher frequency bands / Massive MIMO / Hybrid beamforming / Analog beamforming configuration / Hardware impairment / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 490, RCS2014-337, pp. 213-218, March 2015.
Paper # RCS2014-337 
Date of Issue 2015-02-25 (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)
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Conference Information
Committee RCS SR SRW  
Conference Date 2015-03-04 - 2015-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2015-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Influence of Analog Beamforming Configuration on Massive MIMO with Hybrid Beamforming in High Frequency Bands 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) Higher frequency bands  
Keyword(3) Massive MIMO  
Keyword(4) Hybrid beamforming  
Keyword(5) Analog beamforming configuration  
Keyword(6) Hardware impairment  
1st Author's Name Satoshi Suyama  
1st Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
2nd Author's Name Tatsunori Obara  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Jiyun Shen  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Yukihiko Okumura  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2015-03-05 09:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2014-337 
Volume (vol) vol.114 
Number (no) no.490 
Page pp.213-218 
Date of Issue 2015-02-25 (RCS) 

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