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Paper Abstract and Keywords
Presentation 2026-07-24 15:40
Study on High-Resolution DoA Estimation in a 5G NR SSB-Based Sensing System Using a Real Antenna Array
Shujiro Hatada, Kazuma Tomimoto, Toshiki Hozen, Shumpei Tabuchi, Ryo Yamaguchi (SoftBank) AP2026-68
Abstract (in Japanese) (See Japanese page) 
(in English) Integrated Sensing and Communications (ISAC) requires signal processing techniques that enable communication systems and sensing functions to coexist within the same wireless system. In particular, in sensing using the Synchronization Signal Block (SSB) of 5G NR, the available observation resources are limited; therefore, high-resolution Direction-of-Arrival (DoA) estimation under single-snapshot conditions is important. Fast Iterative Shrinkage-Thresholding Algorithm (FISTA), which is based on sparse estimation, has been studied as a conventional high-resolution DoA estimation method. However, its estimation performance depends on tuning the regularization parameter. In this paper, we apply Iterative Adaptive Approach (IAA), a nonparametric high-resolution DoA estimation method, to SSB-based ISAC sensing and compare it with Delay-and-Sum (DAS) and FISTA. Experimental evaluation using a 7-element linear array in a monostatic measurement setup shows that DAS cannot clearly separate two targets placed at ±5°, whereas FISTA and IAA can separate them. Furthermore, IAA does not require regularization-parameter tuning as in FISTA, demonstrating its effectiveness as a practical DoA estimation method.
Keywords 6G, integrated sensing and communications, ISAC, OFDM radar, SSB, DOA, iterative adaptive approach, IAA.
Keyword (in Japanese) (See Japanese page) 
(in English) 6G / integrated sensing and communications / ISAC / OFDM radar / SSB / DOA / iterative adaptive approach / IAA  
Reference Info. IEICE Tech. Rep., vol. 126, no. 122, AP2026-68, pp. 148-152, July 2026.
Paper # AP2026-68 
Date of Issue 2026-07-15 (AP) 
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 AP2026-68

Conference Information
Committee SAT AP SANE  
Conference Date 2026-07-22 - 2026-07-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Kobe Port Oasis 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Remote sensing, Sattelite Communication, Radio propagation, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-07-SAT-AP-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on High-Resolution DoA Estimation in a 5G NR SSB-Based Sensing System Using a Real Antenna Array 
Sub Title (in English)  
Keyword(1) 6G  
Keyword(2) integrated sensing and communications  
Keyword(3) ISAC  
Keyword(4) OFDM radar  
Keyword(5) SSB  
Keyword(6) DOA  
Keyword(7) iterative adaptive approach  
Keyword(8) IAA  
1st Author's Name Shujiro Hatada  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Kazuma Tomimoto  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Toshiki Hozen  
3rd Author's Affiliation SoftBank Corp. (SoftBank)
4th Author's Name Shumpei Tabuchi  
4th Author's Affiliation SoftBank Corp. (SoftBank)
5th Author's Name Ryo Yamaguchi  
5th Author's Affiliation SoftBank Corp. (SoftBank)
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Speaker Author-1 
Date Time 2026-07-24 15:40:00 
Presentation Time 20 minutes 
Registration for AP 
Paper # AP2026-68 
Volume (vol) vol.126 
Number (no) no.122 
Page pp.148-152 
#Pages 5 
Date of Issue 2026-07-15 (AP) 

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