Wireless network based identification and control with variable time delay

This paper describes a wireless networked system with variable time delay in both of input/output transmission path. Especially, this paper focuses on a packet based network in which subsequent packets catch up the preceding packet. The paper reveals that individual delay values are needed for system identification and control, otherwise only the round trip time can be known the identification and delay compensation control leads unexpected results. To measure time delay, time synchronization of local and remote system is required and this paper proposes to use a synchronization function of IEEE 802.11 based wireless network Simulation studies on identification and delay compensation and the results verified that the proposed method works effectively.