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Paper Abstract and Keywords
Presentation 2026-05-11 15:10
USRP Implementation of Synchronized SS-CDMA System Using Wi-Wi: Evaluation of Large-Scale Uplink Access Considerating Wi-Wi Offset
Toshiki Ouchi, Sho Kanazawa, Tomokazu Watanabe, Masataka Miyake, Suguru Kameda (Hiroshima Univ.) SR2026-8
Abstract (in Japanese) (See Japanese page) 
(in English) In cyber-physical systems (CPS), a massive amount of data must be collected in real time from numerous internet of thing (IoT) devices and sensors, requiring large-scale simultaneous uplink connectivity.
We previously proposed synchronized spread-spectrum code-division multiple access (SS-CDMA).
In synchronized SS-CDMA, signal reception timing among all nodes must be aligned, requiring space-time synchronization between each node and the receiver. In this study, wireless two-way interferometry (Wi-Wi) is considered a high-precision time synchronization method.
In our previous work, synchronized SS-CDMA was implemented using two Universal Software Radio Peripherals~(USRPs), and its performance was experimentally evaluated in a virtual 1000-user simultaneous access environment under ideal synchronization conditions.
In this paper, we evaluate a 1023-user simultaneous uplink environment considering Wi-Wi offsets and verify the consistency between simulation and USRP-based experimental results.
Furthermore, by assigning different synchronization errors to each user in simulations, we assess communication performance under realistic conditions and confirm system feasibility.
Keyword (in Japanese) (See Japanese page) 
(in English) synchronized SS-CDMA / transmission timing control / space-time synchronization / offset / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 13, SR2026-8, pp. 42-48, May 2026.
Paper # SR2026-8 
Date of Issue 2026-05-04 (SR) 
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 SR2026-8

Conference Information
Committee SR  
Conference Date 2026-05-11 - 2026-05-12 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) IoT，general 
Paper Information
Registration To SR 
Conference Code 2026-05-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) USRP Implementation of Synchronized SS-CDMA System Using Wi-Wi: Evaluation of Large-Scale Uplink Access Considerating Wi-Wi Offset 
Sub Title (in English)  
Keyword(1) synchronized SS-CDMA  
Keyword(2) transmission timing control  
Keyword(3) space-time synchronization  
Keyword(4) offset  
Keyword(5)  
Keyword(6)  
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Keyword(8)  
1st Author's Name Toshiki Ouchi  
1st Author's Affiliation Hiroshima University (Hiroshima Univ.)
2nd Author's Name Sho Kanazawa  
2nd Author's Affiliation Hiroshima University (Hiroshima Univ.)
3rd Author's Name Tomokazu Watanabe  
3rd Author's Affiliation Hiroshima University (Hiroshima Univ.)
4th Author's Name Masataka Miyake  
4th Author's Affiliation Hiroshima University (Hiroshima Univ.)
5th Author's Name Suguru Kameda  
5th Author's Affiliation Hiroshima University (Hiroshima Univ.)
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Speaker Author-1 
Date Time 2026-05-11 15:10:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2026-8 
Volume (vol) vol.126 
Number (no) no.13 
Page pp.42-48 
#Pages 7 
Date of Issue 2026-05-04 (SR) 

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