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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SR2006-92 |
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) |
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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) |
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Keyword(1) |
Cognitive Radio |
Keyword(2) |
OFDM |
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Giving interference |
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FFT |
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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 |
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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 |
7 |
Date of Issue |
2007-03-02 (SR) |
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