Frequency sensitivity of sub-excitable systems coupled with different topology |
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Authors: | Li Si-Hao Wang Hong-Li and Ouyang Qi |
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Institution: | Department of Physics, Peking University, Beijing 100871, China |
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Abstract: | We have investigated numerically the behaviours of identical FitzHugh-Nagumo systems, which are coupled into topologies of regular one-dimensional lattice, small-world network and scale-free network, and driven by white noise and an external signal. We found that when a number of uniform systems are coupled into a network, the system's signal-to-noise ratio remains at a high level in a wider frequency range than in the case of a single oscillator. Different architectures manifest different impact, with the scale-free network being the most remarkable. Results presented here suggest a possible approach to improve the sensitivity of a system to external signals and are helpful for designing communication equipments. |
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Keywords: | frequency sensitivity coupled systems stochastic resonance scale-free network small-world network FitzHugh-Nagumo |
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