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Paper Abstract and Keywords
Presentation 2021-11-26 13:50
[Invited Talk] R&D for Higher Frequency Bands Radio-over-Fiber Systems
Yushi Shirato, Kota Ito, Mizuki Suga, Takuto Arai, Yuta Takahashi, Yasuyoshi Yamamoto, Naoki Kita (NTT) MWP2021-31 Link to ES Tech. Rep. Archives: MWP2021-31
Abstract (in Japanese) (See Japanese page) 
(in English) In order to enhance the transmission capacity, it is effective to use higher frequency band radio waves with abundant frequency resources. However, since the propagation loss increases as the frequency becomes higher, it is necessary to deploy radio equipment densely. Therefore, by applying A-RoF (Analog Radio-over-Fiber) and consolidating the signal processing functions of the radio base station to the central station CS (Central Station), RRU (Remote Radio Unit) can be
simplified and be reduced its power consumption. We have been proposing such a system configuration and have reported on the indispensable remote beamforming method. In this presentation, we will outline the proposed remote beamforming methods, and then give a preliminary report on the results of the ongoing study using prototype. It is confirmed that the EVM of the downlink signals transmitted from the RRU assuming indoor condition is about 3.2%, which is better than that shown in 3GPP specification.
Keyword (in Japanese) (See Japanese page) 
(in English) radio-over-fiber / remote beamforming / millimeter-wave / / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 273, MWP2021-31, pp. 6-11, Nov. 2021.
Paper # MWP2021-31 
Date of Issue 2021-11-19 (MWP) 
ISSN Online edition: ISSN 2432-6380
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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 MWP2021-31 Link to ES Tech. Rep. Archives: MWP2021-31

Conference Information
Committee MWP  
Conference Date 2021-11-26 - 2021-11-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Device, etc. 
Paper Information
Registration To MWP 
Conference Code 2021-11-MWP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) R&D for Higher Frequency Bands Radio-over-Fiber Systems 
Sub Title (in English)
Keyword(1) radio-over-fiber  
Keyword(2) remote beamforming  
Keyword(3) millimeter-wave  
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1st Author's Name Yushi Shirato  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Kota Ito  
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 Takuto Arai  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Yuta Takahashi  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
6th Author's Name Yasuyoshi Yamamoto  
6th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
7th Author's Name Naoki Kita  
7th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Speaker Author-1 
Date Time 2021-11-26 13:50:00 
Presentation Time 50 minutes 
Registration for MWP 
Paper # MWP2021-31 
Volume (vol) vol.121 
Number (no) no.273 
Page pp.6-11 
#Pages
Date of Issue 2021-11-19 (MWP) 


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