INHOMOGENEOUS FLUCTUATION DISTRIBUTION IN THE OUTPUT OF STOCHASTIC RESONANCE SYSTEMS AND ITS APPLICATION

Inputting a periodic signal mixed with white noise into a bistable sys tem, we find that the fluctuation distribution in the time series of t he output is strongly inhomogeneous. In certain phase part fluctuation is very low under the stochastic resonance condition, and consequentl y, the signal-to-noise ratio (SNR) there is much higher than that of t he input. This mechanism can be used to design a nonlinear receiver to extract the signal from noise with SNR three times higher than the la rgest SNR obtained so far by the optimal linear filter.