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Paper Abstract and Keywords
Presentation 2017-06-22 16:00
Beam Forming Schemes on Wireless Entrance Systems for Street Small Cells -- Performance Evaluation with 75GHz Outdoor/Indoor Propagation Measurement --
Kazuto Goto, Takahiro Tsuchiya, Mizuki Suga, Atsushi Ohta, Masataka Iizuka (NTT) RCS2017-75
Abstract (in Japanese) (See Japanese page) 
(in English) Toward the 5th Generation Mobile Communications (5G), by using massive MIMO, small cell constructing technologies for offloading traffic in areas where users are densely have been studied. We have studied to make entrance link to small cell base-stations wireless, aiming at the rapid deployment of 5G small cells. On the systems, both of entrance base-stations (EBSs) and relay-stations (RSs) are fixedly installed at high location and it is expected that the direct wave is dominant on the environment. For massive MIMO technologies in such environment, we have proposed 1-tap time-domain beamforming (TDBF) and digital assisted analog beamforming (DAABF). TDBF achieves simplified control. DAABF is useful for low cost implementation by reducing required number of analog digital convertors (ADCs) and digital analog convertors (DACs). In order to confirm the feasibility of the proposed schemes on real environment, we have performed propagation measurement on outdoor and indoor environment at 75GHz band, and collected many sets of channel state information (CSI) on massive antenna systems. In this paper, we show the evaluation results and their effectiveness. In case employing 20 x 10 = 200 antenna elements with about 1.3 wavelength spacing, the proposed schemes can form highly accurate directional beams like maximal ratio combining (MRC) on frequency-domain. Moreover, in case implementing over 6-8 spatial multiplexing, since orthogonalization loss was quite small, we clarified that efficient spatial multiplexing can be realized.
Keyword (in Japanese) (See Japanese page) 
(in English) / / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 103, RCS2017-75, pp. 149-154, June 2017.
Paper # RCS2017-75 
Date of Issue 2017-06-14 (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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2017-75

Conference Information
Committee RCS  
Conference Date 2017-06-21 - 2017-06-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Ishigaki Shoukou Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Resource Control, Scheduling, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2017-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Beam Forming Schemes on Wireless Entrance Systems for Street Small Cells 
Sub Title (in English) Performance Evaluation with 75GHz Outdoor/Indoor Propagation Measurement 
1st Author's Name Kazuto Goto  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Takahiro Tsuchiya  
2nd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
3rd Author's Name Mizuki Suga  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
4th Author's Name Atsushi Ohta  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Masataka Iizuka  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Date Time 2017-06-22 16:00:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2017-75 
Volume (vol) IEICE-117 
Number (no) no.103 
Page pp.149-154 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2017-06-14 

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