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Paper Abstract and Keywords
Presentation 2010-07-29 13:20
System indentification with cyclostationary properties in spectrum spectrum sharing system
Kenta Umebayashi (Tokyo Univ. of Agr and Tech.), Shinya Hatakeyama (Tohoku Electric Power), Yukihiro Kamiya, Yasuo Suzuki (Tokyo Univ. of Agr and Tech.) SR2010-17
Abstract (in Japanese) (See Japanese page) 
(in English) In spectrum sensing, it is determined if a primary user (PU) is present in the studied frequency band (hypothesis $H_1$). If the PU is determined not to be present (hypothesis $H_0$), the frequency band could be used by secondary (unlicensed) users (SUs) for opportunistic access without harmful interference to PUs. In this paper, we apply cyclostationary based signal detection for identifying also two additional situations, $H_2$: another SU is already present in the studied band, and $H_3$: another SU and the PU are both present. In our method, if $H_2$ is decided to be true, fairness among SUs is increased by allowing the newly arrived SU to share the band with those SUs already using it. In the case of our proposed novel hypothesis $H_3$, we signal the SU using the band that it might be interfering with the PU and so it needs to vacate the frequency band immediately. This leads to increased protection of the PU. However, in the case where signal specifications such as carrier frequencies of SUs and the PU are the same or close, there may be false detection under $H_1$ and $H_2$ because of interference between SU and PU cyclic autocorrelation functions (CAFs).
To solve this problem, we present a condition that the frequency offset between SU's carrier frequency and PU's carrier frequency needs to satisfy so that the CAFs of SUs and the PU cause a minimal interference to each other.
Analysis of signal detection performance under $H_3$ where negligible correlation factor exists is introduced. In addition, the numerical results show that even with a small frequency offset it is possible to reliably distinguish between the hypotheses.
Keyword (in Japanese) (See Japanese page) 
(in English) Cognitive radio / cyclostationarity / System identification / Multiple hypothesis / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 153, SR2010-17, pp. 7-12, July 2010.
Paper # SR2010-17 
Date of Issue 2010-07-22 (SR) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 SR2010-17

Conference Information
Committee SR  
Conference Date 2010-07-29 - 2010-07-30 
Place (in Japanese) (See Japanese page) 
Place (in English) ATR (Kyoto) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Technical Exihibition, Reconfigurable Hardware, etc. 
Paper Information
Registration To SR 
Conference Code 2010-07-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) System indentification with cyclostationary properties in spectrum spectrum sharing system 
Sub Title (in English)  
Keyword(1) Cognitive radio  
Keyword(2) cyclostationarity  
Keyword(3) System identification  
Keyword(4) Multiple hypothesis  
1st Author's Name Kenta Umebayashi  
1st Author's Affiliation Tokyo University of Agriculture and Technology (Tokyo Univ. of Agr and Tech.)
2nd Author's Name Shinya Hatakeyama  
2nd Author's Affiliation Tohoku Electric Power (Tohoku Electric Power)
3rd Author's Name Yukihiro Kamiya  
3rd Author's Affiliation Tokyo University of Agriculture and Technology (Tokyo Univ. of Agr and Tech.)
4th Author's Name Yasuo Suzuki  
4th Author's Affiliation Tokyo University of Agriculture and Technology (Tokyo Univ. of Agr and Tech.)
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Date Time 2010-07-29 13:20:00 
Presentation Time 20 
Registration for SR 
Paper # SR2010-17 
Volume (vol) 110 
Number (no) no.153 
Page pp.7-12 
Date of Issue 2010-07-22 (SR) 

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