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Paper Abstract and Keywords
Presentation 2017-01-19 10:25
Study and experimental evaluation on 2-step beam search method in Millimeter-wave communications
Chikara Kojima, Shunsuke Fujio, Ken-ichi Nishikawa, Kazuyuki Ozaki, Zhengyi Li, Atsushi Honda, Shohei Ishikawa, Takenori Ohshima, Hiroshi Ashida, Toshihiro Shimura, Masahiko Shimizu, Yoji Ohashi (FUJITSU LABORATORIES LTD.) IT2016-47 SIP2016-85 RCS2016-237
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we study a two-step beam search method for a beamforming in Millimeter-wave and evaluate this method on experimental test. The fifth-generation mobile communication systems require more high-capacity and high throughput. Millimeter-wave communications are considered as a candidate to respond to the request. We have studied a space division multiple access with millimeter-wave beamforming and try to increase the capacity by controlling the directionality using high-gain narrow beams. In a space division multiple access using narrow beams, high precision beam search method is needed because a slight error of the estimated direction causes serious performance degradation. A conventional beam search method uses a large number of beams to enhance the precision, which results in the reduction of throughput. Therefore, two-step beam search methods in which a beam width changes at each step have been studied. In this paper, we evaluate the optimal number of beams in the case of multi users and indicate that the total beams are reduced when the precision at first step is higher and the number of beams at second step is fewer. The simulation results show that the optimal number of beams in which the performance is equal to that of one-step method is reduced by 45% of one-step method. Moreover, we make sure that the two-step beam search method is effective through actual equipment test and show the distribution of the direction estimation of the test is almost same as that of the expected value.
Keyword (in Japanese) (See Japanese page) 
(in English) Millimeter-wave / Hybrid beamforming / Beam multiplexing / Interleave / Array Antenna / Beam Search / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 396, RCS2016-237, pp. 7-11, Jan. 2017.
Paper # RCS2016-237 
Date of Issue 2017-01-12 (IT, SIP, RCS) 
ISSN Print edition: ISSN 0913-5685  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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee IT SIP RCS  
Conference Date 2017-01-19 - 2017-01-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka City Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing for Wireless Communications, Learning, Mathematical Science, Communication Theory, etc. 
Paper Information
Registration To RCS 
Conference Code 2017-01-IT-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study and experimental evaluation on 2-step beam search method in Millimeter-wave communications 
Sub Title (in English)  
Keyword(1) Millimeter-wave  
Keyword(2) Hybrid beamforming  
Keyword(3) Beam multiplexing  
Keyword(4) Interleave  
Keyword(5) Array Antenna  
Keyword(6) Beam Search  
Keyword(7)  
Keyword(8)  
1st Author's Name Chikara Kojima  
1st Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
2nd Author's Name Shunsuke Fujio  
2nd Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
3rd Author's Name Ken-ichi Nishikawa  
3rd Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
4th Author's Name Kazuyuki Ozaki  
4th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
5th Author's Name Zhengyi Li  
5th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
6th Author's Name Atsushi Honda  
6th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
7th Author's Name Shohei Ishikawa  
7th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
8th Author's Name Takenori Ohshima  
8th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
9th Author's Name Hiroshi Ashida  
9th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
10th Author's Name Toshihiro Shimura  
10th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
11th Author's Name Masahiko Shimizu  
11th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
12th Author's Name Yoji Ohashi  
12th Author's Affiliation FUJITSU LABORATORIES LTD. (FUJITSU LABORATORIES LTD.)
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Speaker
Date Time 2017-01-19 10:25:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-IT2016-47,IEICE-SIP2016-85,IEICE-RCS2016-237 
Volume (vol) IEICE-116 
Number (no) no.394(IT), no.395(SIP), no.396(RCS) 
Page pp.7-11 
#Pages IEICE-5 
Date of Issue IEICE-IT-2017-01-12,IEICE-SIP-2017-01-12,IEICE-RCS-2017-01-12 


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