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Paper Abstract and Keywords
Presentation 2023-06-14 11:00
A Study on Frequency Prism in Intelligent Reflecting Surfaces with Delay Elements over Terahertz Bands
Shuta Sekimori, Yuichi Kawamoto, Nei Kato (Tohoku Univ.) RCS2023-36
Abstract (in Japanese) (See Japanese page) 
(in English) The demand for high-speed communication with large amounts of data is increasing rapidly, but the mmWave spectrum is struggling to keep up. As a result, researchers are turning to terahertz (THz) communication as a potential solution. However, THz signals can be weakened by various factors, such as diffraction loss and high linearity. To combat this, researchers are investigating the use of intelligent reflecting surfaces (IRS) to improve the propagation paths of THz signals by reflecting them around obstacles and controlling their direction. However, beamforming using IRS phase control in THz can have lower beam width and coverage due to their high frequency and short wavelength. To extend the coverage of IRS, we propose using a technique called frequency prism, which distributes the beam direction for each multiplexed subcarrier such as OFDM (Orthogonal Frequency Division Multiplexing). This is accomplished by radiating radio waves with time-shift for each antenna element. However, this method does not apply to IRS since it only reflects incoming radio waves. Therefore, we suggest using a Delay Adjustable-IRS (DA-IRS) to reflect the incident wave after a certain wait time to realize the frequency prism. Finally, we evaluate the performance of our proposed system through simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) Terahertz Waves / Intelligent Reflecting Surface / Frequency Prism / / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 76, RCS2023-36, pp. 49-53, June 2023.
Paper # RCS2023-36 
Date of Issue 2023-06-07 (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 RCS2023-36

Conference Information
Committee RCS  
Conference Date 2023-06-14 - 2023-06-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido University, and online 
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 2023-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Frequency Prism in Intelligent Reflecting Surfaces with Delay Elements over Terahertz Bands 
Sub Title (in English)  
Keyword(1) Terahertz Waves  
Keyword(2) Intelligent Reflecting Surface  
Keyword(3) Frequency Prism  
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1st Author's Name Shuta Sekimori  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Yuichi Kawamoto  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Nei Kato  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2023-06-14 11:00:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2023-36 
Volume (vol) vol.123 
Number (no) no.76 
Page pp.49-53 
#Pages 5 
Date of Issue 2023-06-07 (RCS) 

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