| Presentation | 2007-03-09 Proposal of the giving interference mitigation technique by regenerating null signals in OFDM Cognitive Radios Tomoya TANDAI, Masahiro TAKAGI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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 aveluated by the computer simulation, and the effectiveness of the proposed method is shown. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Cognitive Radio / OFDM / Giving interference / FFT / Null sub-carrier |
| Paper # | SR2006-92 |
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| Committee | SR |
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| Conference Date | 2007/3/2(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Software Radio(SR) |
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| Language | JPN |
| 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 |
| 1st Author's Name | Tomoya TANDAI |
| 1st Author's Affiliation | Corporate R&D Center, Toshiba Corporation() |
| 2nd Author's Name | Masahiro TAKAGI |
| 2nd Author's Affiliation | Corporate R&D Center, Toshiba Corporation |
| Date | 2007-03-09 |
| Paper # | SR2006-92 |
| Volume (vol) | vol.106 |
| Number (no) | 558 |
| Page | pp.pp.- |
| #Pages | 7 |
| Date of Issue | |