This paper proposes a robust adaptive output feedback control strategy which can automatically regulate control gain for\nchaos synchronization. Chaotic systems with input nonlinearities, delayed nonlinear coupling, and external disturbance can\nachieve synchronization by applying this strategy. Utilizing Lyapunov method and LMI technique, the conditions ensuring chaos\nsynchronization are obtained. Finally, simulations are given to show the effectiveness of our control strategy.
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