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Paper Abstract and Keywords
Presentation 2025-01-30 10:30
Multiplexing Scheme for Initial Access Control Signals Using Dedicated Frequency Bandwidth in Sub-THz Communications
Mamoru Sawahashi, Takashi Ohiwa (Tokyo City Univ.), Satoshi Suyama (NTT DOCOMO) IT2024-58 SIP2024-97 RCS2024-241
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a scheme that multiplexes control signals for initial access using a dedicated frequency bandwidth in the sub-Terahertz (THz) bands. We employ subcarrier spacings (SCSs) in a dedicated frequency bandwidth that are narrower than those for other frequency bandwidths that multiplex shared channels used to convey user data and control channels in the physical layer in both the downlink (DL) and uplink (UL). The estimation accuracy of fractional frequency offset (FFO) based on the autocorrelation using the cyclic prefix (CP) that is attached to each discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-S-OFDM) symbol is improved due to the increase in the CP power as the SCS becomes narrower. Accordingly, the narrower SCSs for the control signals in the initial access enable us to achieve a high physical layer cell ID detection probability by making effective use of the FFO estimation and joint estimation of the integer frequency offset (IFO) and primary synchronization signal (PSS) in the DL. Moreover, the narrow SCS achieves a relaxed round trip time delay measurement based on the physical random access channel (PRACH) with a low computational complexity in the UL. We also present a synchronization signal block structure in the DL and PRACH structure in the UL that are suitable for the sub-THz bands.
Keyword (in Japanese) (See Japanese page) 
(in English) initial access / sub-THz bands / synchronization signal block / PRACH / carrier frequency offset / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 366, RCS2024-241, pp. 186-191, Jan. 2025.
Paper # RCS2024-241 
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 IT2024-58 SIP2024-97 RCS2024-241

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) Multiplexing Scheme for Initial Access Control Signals Using Dedicated Frequency Bandwidth in Sub-THz Communications 
Sub Title (in English)  
Keyword(1) initial access  
Keyword(2) sub-THz bands  
Keyword(3) synchronization signal block  
Keyword(4) PRACH  
Keyword(5) carrier frequency offset  
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1st Author's Name Mamoru Sawahashi  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Takashi Ohiwa  
2nd Author's Affiliation Tokyo City University (Tokyo City Univ.)
3rd Author's Name Satoshi Suyama  
3rd Author's Affiliation NTT DOCOMO INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2025-01-30 10:30:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # IT2024-58, SIP2024-97, RCS2024-241 
Volume (vol) vol.124 
Number (no) no.364(IT), no.365(SIP), no.366(RCS) 
Page pp.186-191 
#Pages 6 
Date of Issue 2025-01-22 (IT, SIP, RCS) 

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