Network Synchronization with an Adaptive Coupling Strength

TL;DR

This paper introduces adaptive coupling schemes for synchronizing coupled chaotic systems, capable of working without prior knowledge of the synchronization trajectory and with limited observable data, validated through rigorous proofs and simulations.

Contribution

It proposes novel adaptive coupling strategies that do not require knowledge of the synchronization trajectory and work with observable functions of states.

Findings

Adaptive schemes can synchronize chaotic systems without trajectory knowledge.

Proper parameter choice reduces the required coupling strength.

Simulations confirm effectiveness with weak coupling strengths.

Abstract

In this paper, new schemes to synchronize linearly or nonlinearly coupled chaotic systems with an adaptive coupling strength are proposed. Unlike other adaptive schemes, which synchronize coupled chaotic systems to a special trajectory (or an equilibrium point) of the uncoupled node by adding negative feedbacks adaptively; here, adaptive schemes for the coupling strength are used to synchronize coupled chaotic systems without knowing the synchronization trajectory. Moreover, in many applications, the state variables are not observable; instead, some functions of the states can be observed. How to synchronize coupled systems with the observed data is of great significance. In this paper, synchronization of nonlinearly coupled chaotic systems with an adaptive coupling strength is also discussed. The validity of those schemes are proved rigorously. Moreover, simulations show that by choosing some proper parameter $\alpha$, the coupling strength obtained by adaptation could be much smaller. It means that chaos oscillators can be easily synchronized with a very weak coupling.