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Paper Abstract and Keywords
Presentation 2025-01-29 15:10
[Invited Talk] Delay-Doppler Domain Waveform Design for ISAC -- Can we circumvent the uncertainty principle? --
Hai Lin (Osaka Metropolitan Univ.) IT2024-40 SIP2024-79 RCS2024-223
Abstract (in Japanese) (See Japanese page) 
(in English) Integrated sensing and communication (ISAC) is one of the most important topics in next-generation wireless communication systems, and the core issue is to design waveforms that are excellent for both communication and sensing. Existing modulation waveforms are designed for communication and are not necessarily suitable for sensing. Similarly, existing radar waveforms are designed for sensing and, therefore, are inadequate for communication. Recently, delay-Doppler (DD) domain waveforms have attracted a lot of attention as a promising candidate for ISAC. In this talk, we first revisit the fundamentals of digital modulation waveforms, focusing on the design of pulses that carry the information-bearing digital symbols. Then, we present the challenges of DD domain waveform design, in particular, the constraints imposed on pulse design by the uncertainty principle. Next, we show that such constraints can be circumvented in practical systems with limited bandwidth and duration. We introduce the DD domain orthogonal pulse (DDOP) and explain its mechanism to circumvent the constraints. Then, the DDOP-based orthogonal delay-Doppler division multiplexing (ODDM) modulation is presented. Finally, we compare the ODDM with the popular orthogonal time-frequency space (OTFS) modulation and show the fundamental differences between these two waveforms.
Keyword (in Japanese) (See Japanese page) 
(in English) ISAC / waveform design / digital modulation / ODDM / DDOP / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 366, RCS2024-223, pp. 85-85, Jan. 2025.
Paper # RCS2024-223 
Date of Issue 2025-01-22 (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 IT2024-40 SIP2024-79 RCS2024-223

Conference Information
Committee RCS SIP IT  
Conference Date 2025-01-29 - 2025-01-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Kaikyou-messe 
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 2025-01-RCS-SIP-IT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Delay-Doppler Domain Waveform Design for ISAC 
Sub Title (in English) Can we circumvent the uncertainty principle? 
Keyword(1) ISAC  
Keyword(2) waveform design  
Keyword(3) digital modulation  
Keyword(4) ODDM  
Keyword(5) DDOP  
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1st Author's Name Hai Lin  
1st Author's Affiliation Osaka Metropolitan University (Osaka Metropolitan Univ.)
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Speaker Author-1 
Date Time 2025-01-29 15:10:00 
Presentation Time 50 minutes 
Registration for RCS 
Paper # IT2024-40, SIP2024-79, RCS2024-223 
Volume (vol) vol.124 
Number (no) no.364(IT), no.365(SIP), no.366(RCS) 
Page p.85 
#Pages 1 
Date of Issue 2025-01-22 (IT, SIP, RCS) 

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