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Paper Abstract and Keywords
Presentation 2025-08-28 12:30
A Study on Outdoor Propagation Loss Estimation Based on Transformer Architecture in Virtual Urban Environments
Miyuki Hirose (Kyutech) AP2025-59
Abstract (in Japanese) (See Japanese page) 
(in English) This study proposes a propagation loss estimation model based on Transformer architecture, utilizing structural information derived from virtual urban environments represented by 3D point cloud data. The virtual urban spaces are procedurally generated to emulate various urban layouts, including dense commercial areas, grid-based city blocks, and regional cities, with building heights and material properties reflected in the point cloud representation. In these virtual environments, transmitter and receiver locations are randomly assigned, and corresponding path loss values are computed using ray-tracing simulations to generate training data. The proposed model combines PointNet to extract spatial features from the point cloud with a Transformer encoder that learns the spatial relationship between transmitter and receiver positions. This allows the model to flexibly capture propagation characteristics influenced by urban structures. Evaluation against ray-tracing ground truth demonstrates the model’s ability to estimate both LOS and NLOS conditions, including the effects of structural obstructions. These results validate the effectiveness of leveraging virtual urban environments for data-driven propagation modeling.
Keyword (in Japanese) (See Japanese page) 
(in English) Outdoor Propagation Loss Estimation / Point Cloud Data / Generative Model / Transformer / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 161, AP2025-59, pp. 1-4, Aug. 2025.
Paper # AP2025-59 
Date of Issue 2025-08-21 (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)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
Download PDF AP2025-59

Conference Information
Committee AP  
Conference Date 2025-08-28 - 2025-08-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Yagiyama Campus, Tohoku Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2025-08-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Outdoor Propagation Loss Estimation Based on Transformer Architecture in Virtual Urban Environments 
Sub Title (in English)  
Keyword(1) Outdoor Propagation Loss Estimation  
Keyword(2) Point Cloud Data  
Keyword(3) Generative Model  
Keyword(4) Transformer  
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1st Author's Name Miyuki Hirose  
1st Author's Affiliation Kyushu Institute of Technology (Kyutech)
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Speaker Author-1 
Date Time 2025-08-28 12:30:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-59 
Volume (vol) vol.125 
Number (no) no.161 
Page pp.1-4 
#Pages 4 
Date of Issue 2025-08-21 (AP) 

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