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In this paper, we focused on how to get CRs collaborate effectively as well as maximize energy savings in cognitive radio sensor network. We have established a model of evolutionary game between a cognitive sensors. In order to let cognitive sensors sense spectrum effectively, we designed a contribution-punishment mechanism, which can stimulate high SNR sensors to participate in spectrum sensing....
In this paper, a new architecture of RF receivers in the cognitive radios is proposed for sensing the spectral environment. The receiver has two mixer stages and a high intermediate frequency (IF) for up/down dual-converting signal frequency. In order to select the channels in UHF (470-870 MHz) band in TV broadcast, the range of frequency points in the first local oscillator is from 1640 MHz to 2040...
In this paper, we present a new wideband low noise amplifier which operate in UHF band for spectral sensing in the receiver of cognitive radios. The circuit employs the noise-canceling technique, and can achieve the higher gain and lower power dissipation. The method of shunt-resistive feedback is adopted for achieving a broad bandwidth. The LNA is designed by the CMOS 0.18 um RF technology. Simulated...
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