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Paper Abstract and Keywords
Presentation 2026-03-18 14:45
Exploring the physical limit of wireless information communications -- How can get closer to the Shannon limit in doubly selective fading environments --
Yoshio Karasawa AP2025-227
Abstract (in Japanese) (See Japanese page) 
(in English) Future mobile communications using higher frequencies, as well as underwater acoustic communications, which are also a target for expanding coverage, will encounter doubly selective fading environments in which both delay time spread and Doppler frequency spread are large. The author has derived a theoretical approximation formula that can easily calculate the channel capacity, which provides an upper limit on information transmission capability in the environment. In this formula, the channel capacity decreases depending on the value of the spread factor, but by expanding the bandwidth under constant signal power, the channel capacity can be increased up to the Shannon limit, where the effect of fading can be eliminated. In this report, we quantitatively clarify the relationship between channel capacity and bandwidth expansion in doubly selective fading environments.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communication / Doubly selective fading / Channel capacity / Spread factor / Shannon limit / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 419, AP2025-227, pp. 18-23, March 2026.
Paper # AP2025-227 
Date of Issue 2026-03-11 (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 AP2025-227

Conference Information
Committee AP  
Conference Date 2026-03-18 - 2026-03-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Matsumoto Chamber of Commerce and Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-03-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Exploring the physical limit of wireless information communications 
Sub Title (in English) How can get closer to the Shannon limit in doubly selective fading environments 
Keyword(1) Mobile communication  
Keyword(2) Doubly selective fading  
Keyword(3) Channel capacity  
Keyword(4) Spread factor  
Keyword(5) Shannon limit  
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1st Author's Name Yoshio Karasawa  
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Speaker Author-1 
Date Time 2026-03-18 14:45:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-227 
Volume (vol) vol.125 
Number (no) no.419 
Page pp.18-23 
#Pages 6 
Date of Issue 2026-03-11 (AP) 

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