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Paper Abstract and Keywords
Presentation 2010-11-12 09:40
A Study on Autonomous PU Detection Scheme by SU with Cyclic Prefix in OFDM-based Cognitive Radio
Keisuke Naito, Iwao Sasase (Keio Univ.) CS2010-47
Abstract (in Japanese) (See Japanese page) 
(in English) CR(Cognitive Radio) has been attracted attentions to resolve the problem related to lack of frequencies. For the CR, if we detect the unused frequency band which is used by licensed PU(Primary User), SU(Secondary User) starts to use the frequency band. In the conventional scheme, centralized control manages frequency resources to avoid the interference between PU and SU. However, there are problems related to infrastructure construction cost increment caused by miniaturization of cell size and CR has little flexibility when it starts. In this paper, we study autonomous PU detection scheme by SU when PU starts to use the licensed frequency band, which needs neither management of frequency by centralized control, nor side information which is a part of the frequency band. We assume that PU modulation is OFDM(Orthogonal Frequency Division Multiplex). After SU calculates the correlation between CP(Cyclic Prefix) and effective symbol, the one with a high correlation is regarded as a synchronous candidate. Then the pilot subcarriers are extracted from OFDM symbol of synchronous candidate in the frequency domain. To detect PU, IFFT(Inverse Fast Fourier Transform) is applied to the extracted subcarriers which is multiplied known pilot subcarriers. The detection probability is evaluated by the computer simulation, and the effectiveness of the proposed method is shown.
Keyword (in Japanese) (See Japanese page) 
(in English) Cognitive Radio / OFDM / PU detection / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 269, CS2010-47, pp. 59-64, Nov. 2010.
Paper # CS2010-47 
Date of Issue 2010-11-04 (CS) 
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)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
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Conference Information
Committee CS  
Conference Date 2010-11-11 - 2010-11-12 
Place (in Japanese) (See Japanese page) 
Place (in English) Wakura Hot Spring 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Broadband access systems, home networks, network services, applications for communications, etc. 
Paper Information
Registration To CS 
Conference Code 2010-11-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Autonomous PU Detection Scheme by SU with Cyclic Prefix in OFDM-based Cognitive Radio 
Sub Title (in English)  
Keyword(1) Cognitive Radio  
Keyword(2) OFDM  
Keyword(3) PU detection  
1st Author's Name Keisuke Naito  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Iwao Sasase  
2nd Author's Affiliation Keio University (Keio Univ.)
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Date Time 2010-11-12 09:40:00 
Presentation Time 20 
Registration for CS 
Paper # IEICE-CS2010-47 
Volume (vol) IEICE-110 
Number (no) no.269 
Page pp.59-64 
#Pages IEICE-6 
Date of Issue IEICE-CS-2010-11-04 

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