Effects of noise coherence on stochastic resonance enhancement in a bithreshold system - art. no. 026117

We identify a method for optimizing the stochastic resonance (SR) in a symm etric bithreshold device: by varying the coherence of the added noise serie s. To show SR enhancement via this method, we compare the performance of th e system using noise sources with different coherence at normalized amplitu de. The normalization of the noise amplitude is based on the mean threshold crossing rate of the Gaussian white noise, which is considered as the stan dard noise in SR studies, at optimal variance. The amplitude for optimal pe rformance of the Gaussian white noise is determined using a signal-to-noise ratio (Q). The Q measure is also used to compare and examine the system pe rformance for different noise cases. This measure is used because it is par ticularly sensitive to the effects of coherence, on the quality of the outp ut power spectrum.