基于滑模观测器的网络拥塞控制仿真研究

摘要

拥塞控制是使网络正常高效运行的关键技术之一.由于实际网络中的一些系统状态无法直接获取,因此现有的网络拥塞控制方法常采用状态观测器来获取系统状态,从而实现状态反馈控制.但当系统存在不确定性和非线性干扰时,传统的线性观测器不能满足要求.为此在系统中引入滑模观测器,对系统不确定性和非线性干扰均具有很好的鲁棒性.并提出基于滑模观测器的状态反馈网络拥塞控制方法,进行计算机仿真研究.仿真结果表明,所提出的基于滑模观测器的网络拥塞控制方法具有很好的控制性能.%Congestion control is one of the key technologies for networks.Because not all the system states in real networks can be obtained directly,the linear state-observer is used in existing congestion control algorithms to obtain the system state so as to realize the state-feedback congestion control.However,when the uncertainty and nonlinear disturbance.exist,the designed linear state-observer cannot obtain satisfied results.Therefore,to get the system state,a slide-mode observer is designed,which has strong robustness against the uncertainty and nonlinear disturbance.Then a state-feedback congestion control algorithm based on the slide-mode observer is presented,and the algorithm is simulated through Matlab software.Simulation results show that the proposed algorithm has good control performance.