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Paper Abstract and Keywords
Presentation 2011-07-07 14:00
[Invited Talk] Autonomous Primary User Detection Scheme by Suppressing Pilot Signal in OFDM-based Cognitive Radio
Keisuke Naito, Iwao Sasase (Keio Univ.) CS2011-17
Abstract (in Japanese) (See Japanese page) 
(in English) OFDM(Orthogonal Frequency Division Multiplexing)-based CR(Cognitive Radio) has been attracting attentions to resolve lack of frequencies.For the CR, if we detect unused PU(Primary User) having a license frequency band, SU(Secondary User) begins to use the frequency band.So, SU must not interfere with PU when CR is applied.In conventional scheme, dividing licensed band into PU band and SU band, we detect PU from mixed signal of PU and SU in CR band.However, there are problems that 10 symbols are required for the detection, and the detection probability degrades when SIR(Signal to Interference Ratio) of PU signal power to SU signal power ratio is low.Consequently, we propose autonomous PU detection scheme by suppressing pilot signal from mixed signal of PU and SU to reduce the number of symbols for the detection and increase the detection probability in low SIR.First, by receiving control signal in PU band, the transmission and reception of PU and SU is synchronized.Then, PU transmits the pilot signal to stop SU after SU transmitted 1 symbol.
SU signal is suppressed by subtracting only SU symbol from mixed signal of PU and SU.Our proposed scheme increases detection probability in low SIR during SU communication.The detection probability is evaluated by the computation simulation, and the effectiveness of the proposed scheme is shown.
Keyword (in Japanese) (See Japanese page) 
(in English) Cognitive Radio / OFDM / Detection / Suppression / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 117, CS2011-17, pp. 41-46, July 2011.
Paper # CS2011-17 
Date of Issue 2011-06-30 (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.
Download PDF CS2011-17

Conference Information
Committee CS  
Conference Date 2011-07-07 - 2011-07-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Kumejima 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Next generation networks, access network, broadband access system, power-line communications, wireless communication systems, coding system, etc. 
Paper Information
Registration To CS 
Conference Code 2011-07-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Autonomous Primary User Detection Scheme by Suppressing Pilot Signal in OFDM-based Cognitive Radio 
Sub Title (in English)  
Keyword(1) Cognitive Radio  
Keyword(2) OFDM  
Keyword(3) Detection  
Keyword(4) Suppression  
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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Speaker Author-1 
Date Time 2011-07-07 14:00:00 
Presentation Time 25 minutes 
Registration for CS 
Paper # CS2011-17 
Volume (vol) vol.111 
Number (no) no.117 
Page pp.41-46 
Date of Issue 2011-06-30 (CS) 

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