Information: Join today and make your research activities more affordable! Technical workshop participation fees and annual registration fees are available at member rates.
Notice: [Important] Announcement of Changes to Registration Fee Payment and Manuscript Upload Procedures for IEICE Technical Meetings
IEICE Technical Committee Submission System
Conference Paper's Information		 Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2026-01-27 10:55
Study on Beamfocusing in User Cooperative Communication in the Near Field of a Base Station
Masahito Funaki, Toshihiko Nishimura, Yasutaka Ogawa, Katsuya Suto, Takeo Ohgane (Hokkaido Univ.) IT2025-63 SIP2025-77 RCS2025-234
Abstract (in Japanese) (See Japanese page) 
(in English) In fifth-generation (5G) and beyond mobile communication systems, high-frequency bands such as millimeter-wave and sub-terahertz bands are being explored to enhance system throughput. However, severe propagation loss at high frequencies, together with strict constraints on transmit power and antenna size at user terminals, poses significant challenges. To address these issues, this paper investigates beamfocusing in cooperative transmission among user terminals, where multiple cooperating terminals are located in the near-field region of a base station (BS) equipped with a phase-only controlled phased array. First, we formulate the phase design for both the terminals and the BS array under the assumption that terminal locations are known. We then extend our analysis to a practical scheme in which terminal locations are estimated. A coarse estimation of the terminal positions is performed using a positioning system such as GPS. Based on this coarse estimate, a method for refined position estimation is developed, through which the phases of the terminals and the BS phased array are determined. Simulation results demonstrate that our cooperative transmission scheme with three terminals achieves approximately 3 dB improvement in received power at the BS compared with the single-terminal case.
Keyword (in Japanese) (See Japanese page) 
(in English) Cooperative communication / Phased array / Near-field region / Beamfocusing / Rayleigh distance / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 334, RCS2025-234, pp. 148-153, Jan. 2026.
Paper # RCS2025-234 
Date of Issue 2026-01-19 (IT, SIP, 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 IT2025-63 SIP2025-77 RCS2025-234

Conference Information
Committee IT RCS SIP  
Conference Date 2026-01-26 - 2026-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Forest Sendai 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing for Wireless Communications, Learning, Mathematics, Information Theory, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-01-IT-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on Beamfocusing in User Cooperative Communication in the Near Field of a Base Station 
Sub Title (in English)  
Keyword(1) Cooperative communication  
Keyword(2) Phased array  
Keyword(3) Near-field region  
Keyword(4) Beamfocusing  
Keyword(5) Rayleigh distance  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masahito Funaki  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Toshihiko Nishimura  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Yasutaka Ogawa  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Katsuya Suto  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
5th Author's Name Takeo Ohgane  
5th Author's Affiliation Hokkaido University (Hokkaido Univ.)
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
21st Author's Name  
21st Author's Affiliation ()
22nd Author's Name  
22nd Author's Affiliation ()
23rd Author's Name  
23rd Author's Affiliation ()
24th Author's Name  
24th Author's Affiliation ()
25th Author's Name  
25th Author's Affiliation ()
26th Author's Name / /
26th Author's Affiliation ()
()
27th Author's Name / /
27th Author's Affiliation ()
()
28th Author's Name / /
28th Author's Affiliation ()
()
29th Author's Name / /
29th Author's Affiliation ()
()
30th Author's Name / /
30th Author's Affiliation ()
()
31st Author's Name / /
31st Author's Affiliation ()
()
32nd Author's Name / /
32nd Author's Affiliation ()
()
33rd Author's Name / /
33rd Author's Affiliation ()
()
34th Author's Name / /
34th Author's Affiliation ()
()
35th Author's Name / /
35th Author's Affiliation ()
()
36th Author's Name / /
36th Author's Affiliation ()
()
Speaker Author-1 
Date Time 2026-01-27 10:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # IT2025-63, SIP2025-77, RCS2025-234 
Volume (vol) vol.125 
Number (no) no.332(IT), no.333(SIP), no.334(RCS) 
Page pp.148-153 
#Pages 6 
Date of Issue 2026-01-19 (IT, SIP, RCS) 

[Return to Top Page]

[Return to IEICE Web Page]
The Institute of Electronics, Information and Communication Engineers (IEICE), Japan