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Paper Abstract and Keywords
Presentation 2023-03-03 15:50
Simultaneous Beam Search with Multiple Distributed Antennas for Distributed Antenna System
Shuki Wai, Takuto Arai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) RCS2022-295
Abstract (in Japanese) (See Japanese page) 
(in English) Distributed antenna (DA) system using high-frequency bands such as millimeter-wave and sub-terahertz is expected to be one of promising method to increase remarkably the capacity of future wireless communications. Because the high-frequency bands system can provide a wider bandwidth than the conventional wireless communications and the distributed antenna system improves the spatial multiplexing transmission performance by reducing spatial correlations of the MIMO(Multi-Input Multi-Output) channel in LoS(Line-of-Sight) environments. However, the overhead of beam searching for antennas beamforming in the system is larger than the conventional wireless communications, because the beamwidth of antennas is needed to be narrower to compensate large propagation attenuation of the high frequency bands and the beams searching are needed to be operated for all of the DAs. In this paper, in order to solve the problem, we propose simultaneous beam search scheme in which multiple DAs simultaneously search optimal beam the same frequency resource, so that the overhead is independent of the number of DAs. Numerical simulations and experimental evaluations show that for most of the evaluated user equipment (UE) locations, the reduced level of received power at the UE due to the DA/beam selected by the proposed method is less than 4.15 dB compared to the DA/beam selected by the conventional method.
Keyword (in Japanese) (See Japanese page) 
(in English) Beam search / Millimeter wave / Sub-terahertz wave / Distributed antenna System / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 399, RCS2022-295, pp. 249-254, March 2023.
Paper # RCS2022-295 
Date of Issue 2023-02-22 (RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 RCS2022-295

Conference Information
Committee RCS SR SRW  
Conference Date 2023-03-01 - 2023-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology, and Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2023-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Simultaneous Beam Search with Multiple Distributed Antennas for Distributed Antenna System 
Sub Title (in English)  
Keyword(1) Beam search  
Keyword(2) Millimeter wave  
Keyword(3) Sub-terahertz wave  
Keyword(4) Distributed antenna System  
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1st Author's Name Shuki Wai  
1st Author's Affiliation NTT Corporation (NTT)
2nd Author's Name Takuto Arai  
2nd Author's Affiliation NTT Corporation (NTT)
3rd Author's Name Tatsuhiko Iwakuni  
3rd Author's Affiliation NTT Corporation (NTT)
4th Author's Name Daisei Uchida  
4th Author's Affiliation NTT Corporation (NTT)
5th Author's Name Naoki Kita  
5th Author's Affiliation NTT Corporation (NTT)
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Speaker Author-1 
Date Time 2023-03-03 15:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2022-295 
Volume (vol) vol.122 
Number (no) no.399 
Page pp.249-254 
#Pages 6 
Date of Issue 2023-02-22 (RCS) 

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