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.
Received: 28 May 2003
Revised: 18 November 2003
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China(Grand No 19725519).
Cite this article:
Li Si-Hao (李思昊), Wang Hong-Li (王宏利), Ouyang Qi (欧阳颀) Frequency sensitivity of sub-excitable systems coupled with different topology 2004 Chinese Physics 13 448
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