Analysis And Design Of Clock Synchronization Error Based On Output Feedback Model Predictive Control

With the increasing use of WSN,this paper considers the need for existing WSN applications for high-performance clock synchronization algorithms.First,the clock synchronization protocol with good performance under the wired network does not apply to WSN,and can not satisfy the node's restriction on energy consumption and computing resources.Second,the existing WSN-oriented clock synchronization protocol,in the convergence speed,synchronization error performance indicators are not satisfactory.In order to adapt to the influence of packet loss of clock information on clock synchronization performance in clock synchronization bi-directional information exchange process,according to the separation mechanism,based on the theory of network control,this paper designs an estimator based on Kalman filter and a controller based on output feedback model predictive control.Breaking the traditional framework of protocol research,it improves the system anti-jamming capability,accelerate the system convergence rate,quantify the control error,and improve the robustness of the system for packet loss.The main work of this paper are:1.This paper establishes a unified framework of clock synchronization system based on network control perspective.Consider that packets can not arrive within the predetermined observation period,the data loss is generated because of the WSN unreliable data transmission environment.According to the stochastic process of the Bernoulli distribution according to the packet loss variable,the state observation model under the condition of complete measurement is modified.The unified relative clock state space model considers the influence factors such as network delay and process noise and other factors based on the network control point of view.2.The clock synchronization method based on the output feedback model predictive control of the local state estimator and the controller is discussed.Based on the observation model under imperfect measurement,the variance bound of the variance of synchronous error under the condition of packet loss is statistically analyzed.And The Kalman Filter packet loss variance bounds are mapped to the invariant set of errors under the magnified imperfect measure.The optimal model of optimal control problem under set constraints is established.The method of output feedback model predictive control clock synchronization is established under the unified method.The feasibility of on-line computation complexity and network control perspective is considered synthetically.It is robust to the unreliability,network size and convergence performance of wireless networks.And the exponential stability of the output feedback model predictive control clock synchronization is realized.3.The simulation results show that the clock synchronization algorithm based on output feedback model predictive control has some advantages in terms of synchronization error,convergence rate,robustness to packet loss and so on.