Optimal Performance of Discrete Networked Systems With Cyber-Attack and Packet Dropouts

In this study, the limitations of the tradeoff performance of multiple-input-multiple-output (MIMO) discrete networked control systems (NCSs) with forward channel subject to cyber-attack, additive white Gaussian noise and packet dropouts were analyzed. The performance of intrusion detection systems under cyber-attack with incomplete information was analyzed using game theory. Then, explicit expressions for the optimal tradeoff performance between tracking error and control input are derived based on the two-degree-of-freedom (TDOF) controller using frequency domain analysis, coprime factorization technique and Youla parameterization method. Results show that the tradeoff performance of the system is affected by their fundamental properties, such as the direction and position of the nonminimum phase (NMP) zeros and unstable poles (UPs) in the plant as well as communication constraints, such as cyber-attack, additive white Gaussian noise and packet dropouts. Finally, an illustrative simulation is discussed to verify the aforementioned conclusions.