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Paper Abstract and Keywords
Presentation 2007-03-09 10:00
Proposal of the giving interference mitigation technique by regenerating null signals in OFDM Cognitive Radios
Tomoya Tandai, Masahiro Takagi (Toshiba Corp.) SR2006-92
Abstract (in Japanese) (See Japanese page) 
(in English) In this manuscript, the technique to mitigate the giving interference to primary systems in OFDM Cognitive Radios is proposed. In the OFDM Cognitive Radios, the sub-carriers equivalent to frequency bands where the signals of primary system are detected are set as null sub-carriers, and the signals of cognitive radios are transmitted on the sub-carriers where the signals of primary system are not detected (hereinafter, this is called “effective sub-carrier”). In such a situation, there rises a problem that the leaked signal from the effective sub-carriers to the null sub-carriers may interfere with the primary systems. Therefore, the leaked signal has to be lowered. In the proposed method, the signal consists of multiple OFDM symbols is buffered and over-sampled, then the over-sampled signal is Fourier transformed. The null sub-carriers in the Fourier transformed signal are zeroed again, then the signal is inverse Fourier transformed and transmitted. By taking the above process, the leaked signal to the null sub-carriers is lowered. The spectrum characteristics and the packet error rate in the proposed method are 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 / Giving interference / FFT / Null sub-carrier / / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 558, SR2006-92, pp. 21-27, March 2007.
Paper # SR2006-92 
Date of Issue 2007-03-02 (SR) 
ISSN Print edition: ISSN 0913-5685    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)
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Conference Information
Committee RCS MoNA WBS SR MW  
Conference Date 2007-03-07 - 2007-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) YRP 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SR 
Conference Code 2007-03-RCS-MoMuC-WBS-SR-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal of the giving interference mitigation technique by regenerating null signals in OFDM Cognitive Radios 
Sub Title (in English)  
Keyword(1) Cognitive Radio  
Keyword(2) OFDM  
Keyword(3) Giving interference  
Keyword(4) FFT  
Keyword(5) Null sub-carrier  
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1st Author's Name Tomoya Tandai  
1st Author's Affiliation Toshiba Corporation (Toshiba Corp.)
2nd Author's Name Masahiro Takagi  
2nd Author's Affiliation Toshiba Corporation (Toshiba Corp.)
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Speaker Author-1 
Date Time 2007-03-09 10:00:00 
Presentation Time 20 minutes 
Registration for SR 
Paper # SR2006-92 
Volume (vol) vol.106 
Number (no) no.558 
Page pp.21-27 
#Pages
Date of Issue 2007-03-02 (SR) 


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