2012 Fiscal Year Final Research Report
Development of Widely Tunable RF Frontend: Challenge for Realization of Cognitive Radio
| Project/Area Number |
23656248
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Communication/Network engineering
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| Research Institution | Chiba University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
安 昌俊 アンチャンジュン千葉大学, 大学院・工学研究科, 准教授 (90453208)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 通信方式(無線、有線、衛星、光、移動) / ソフトウェア無線 |
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| Research Abstract |
This project was aimed at developing the software defined radio using a radio frequency (RF) recursive filter.
First, auto tuning of the recursive filter was investigated. It is shown that the oscillation behaviors can be expressed well by the van der Paul equation, and this fact enables us to adjust the center frequency. We can also set the filter Q factor by storing the relation of the amplifier gain and its control voltage to the embedded micro-controller.
Next, higher-order filters were synthesized combining multiple recursive filters. The auto-setting procedure allows us to compose a quasi-continuously tunable filter for the 300-500 MHz range.
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