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中文摘要：
针对网络拥塞设计一种基于变往返时间的主动队列管理算法.给出了一种新的TCP窗口观测器,证明当丢包率取值范围在0～1之间时,TCP窗口观测值渐近收敛到TCP窗口真实值.通过反步设计法设计了一种非线性输出反馈控制算法,并给出了控制参数的取值范围.NS仿真表明,NOFC-VRTT算法具有较好的鲁棒性,较高的链路利用率和较低的丢包率,并且维持了各TCP源之间的公平性.
英文摘要：
An active queue management algorithm is presented for network congestion,which is based on variable round trip time（RTT）.A novel TCP window size observer is first proposed,which can prove that the observer state converges to the real sate asymptotically,when packet dropping or marking ratio falls between 0 and 1.A nonlinear output feedback controller is designed based on backstepping technique,and the value range of the parameters are also discussed.Ns simulation results show that the proposed NOFC-VRTT presents high robust stabilization,high link utilization and low packet loss ratio,which even provides high fairness for the TCP sources.
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