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Paper Abstract and Keywords
Presentation 2026-06-17 10:15
Covert Communication using Stacked Intelligent Metasurfaces
Shunto Nakajima (YNU), Kazuki Maruta (TUS), Naoki Ishikawa (YNU), Shun Kojima (CU) RCS2026-28
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, covert communication, which hides its existence to address information leakage, has attracted attention. In particular, covert communication assisted by a Reconfigurable Intelligent Surface (RIS), which dynamically controls the wireless propagation environment using meta-atoms, is focused on for improving covert rate and covertness. However, conventional single-layer RIS have limited spatial degrees of freedom (DoF) and signal processing capabilities. To address this, we propose a low-complexity, low-cost, and high-speed covert communication framework utilizing Stacked Intelligent Metasurfaces (SIM), which extend the RIS to a multi-layer structure. Additionally, we develop a joint optimization method for the transmit power and the SIM's discrete phase shifts to maximize the covert rate. Simulations quantitatively confirmed that the proposed method improves the covert rate compared to conventional RIS. We also demonstrated the covert rate improvement with increasing meta-atoms and a significant reduction in simulation execution time by the proposed joint optimization, verifying the effectiveness of the proposed SIM-assisted framework.
Keyword (in Japanese) (See Japanese page) 
(in English) Covert communication / stacked intelligent metasurfaces (SIM) / spatial degrees of freedom (DoF) / alternating optimization (AO) / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-28, pp. 17-22, June 2026.
Paper # RCS2026-28 
Date of Issue 2026-06-10 (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 RCS2026-28

Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Covert Communication using Stacked Intelligent Metasurfaces 
Sub Title (in English)  
Keyword(1) Covert communication  
Keyword(2) stacked intelligent metasurfaces (SIM)  
Keyword(3) spatial degrees of freedom (DoF)  
Keyword(4) alternating optimization (AO)  
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1st Author's Name Shunto Nakajima  
1st Author's Affiliation Yokohama National University (YNU)
2nd Author's Name Kazuki Maruta  
2nd Author's Affiliation Tokyo University of Science (TUS)
3rd Author's Name Naoki Ishikawa  
3rd Author's Affiliation Yokohama National University (YNU)
4th Author's Name Shun Kojima  
4th Author's Affiliation Yokohama National University (CU)
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Speaker Author-1 
Date Time 2026-06-17 10:15:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-28 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.17-22 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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