Influence of packet loss on wireless feedback control systems as a disturbance

Abstract

The knowledge of characteristics of the influence of packet loss is important to design controllers and observers which can reduce this influence on wireless feedback control systems. This paper clarifies the characteristics of the influence of packet loss as a disturbance that causes a difference between transmitted information and used information at the received side. Through the analyses of the influence of packet loss on both controller and controlled object sides, we clarify the power spectrum density of the influence on the controller side is not constant. Numerical results show an well-known approach -H ∞ controller, which can reduce the influence of white disturbances, can not reduce the influence of packet loss. Our analyses will be useful for good modeling of the influence of packet loss to design controllers and observers. Wireless feedback control systemThis paper deals with a wireless feedback control system that is discretized at a sampling interval T s . At time t ¼ kT s (k ¼ 0; 1; 2; Á Á Á), each of the state information and the control information is expressed as x½k and u½k. The plant is assumed to be linear time invariant system and is modeled by state equation as follows: Fig. 3. Power spectrum density of w u ½k (S w u ðfÞ) (p ¼ 0:2).

Effect of fuzzy PID controller on feedback control systems based on wireless sensor network

“…The influence of packet loss on WFCS is important to design controllers to reduce the disturbance between transmissions and the received information. The results proves that, the power spectrum density (PSD) of the effect on the controller is not constant [22]. A proportional-integral-derivative (PID) controller for controlling a set of wireless devices to form a WFCS that can affect the orientation of the system to desired state is presented in [23].…”