| Presentation | 2005-11-24 Development from Software Defined Radio to Cognitive Radio Yasuo SUZUKI, Takeo FUJII, Yukihiro KAMIYA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The cognitive radio is recently attracting attention instead of the software defined radio(SDR). When viewing this transition from the viewpoint of a technological subject to be solved, it can be caught with the transition from a countermeasure for "interference from the thirds" to that for "interference to the thirds". The latter has the same aspect as that for "hidden terminal problem". Accordingly, in order to solve radically the problem on "interference to the thirds", the countermeasure that it stepped even into a MAC Layer is necessary. In this paper, a formulation on "interference signals from the thirds" and "interference signals to the thirds" is firstly carried out based on the microwave circuit theory using the scattering matrix. Next, a concept of an ad-hoc cognitive radio is introduced, in which it can share the frequency with current system by cooperating with the operation of MAC layer. Two examples are included concretely. One is a frequency sharing system using an adaptive array antenna that avoids giving the interference to the surrounding terminals by null steering before the transmission of data. Another is a multi-hop system that avoids adaptively giving the interference to the current system. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Cognitive radio / Scattering matrix / Countermeasure for interference / MAC Layer / Frequency sharing |
| Paper # | SR2005-48 |
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| Conference Information | |
| Committee | SR |
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| Conference Date | 2005/11/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| 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) | Development from Software Defined Radio to Cognitive Radio |
| Sub Title (in English) | |
| Keyword(1) | Cognitive radio |
| Keyword(2) | Scattering matrix |
| Keyword(3) | Countermeasure for interference |
| Keyword(4) | MAC Layer |
| Keyword(5) | Frequency sharing |
| 1st Author's Name | Yasuo SUZUKI |
| 1st Author's Affiliation | Department of Electrical and Electronic Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology() |
| 2nd Author's Name | Takeo FUJII |
| 2nd Author's Affiliation | Department of Electrical and Electronic Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology |
| 3rd Author's Name | Yukihiro KAMIYA |
| 3rd Author's Affiliation | Department of Electrical and Electronic Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology |
| Date | 2005-11-24 |
| Paper # | SR2005-48 |
| Volume (vol) | vol.105 |
| Number (no) | 430 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |