基于自适应滤波的带宽测量方法研究  

Bandwidth measurement based on adaptive filtering

作　　者：李国栋[1] 焦杜娟[1] 张英杰[2] 马全中[1,3] 柳长安[1] 

机构地区：[1]华北电力大学控制与计算机工程学院,北京102206 [2]中国科学院国家科学图书馆,北京100190 [3]许昌供电公司,许昌461000

出　　处：《高技术通讯》2011年第5期478-481,共4页Chinese High Technology Letters

基　　金：国家自然科学基金（60775058）和教育部重点（107028）资助项目.

摘　　要：用自适应滤波（AF）算法替换带宽测量算法NEPRI中固有的往返时间（RTT）值的测量算法，提出了测量网络带宽的AF—NEPRI算法。采用AF-NEPRI算法测量链路可用带宽时，首先数据发送端发送不同速率的探测包，然后采用自适应滤波算法测量数据包的RTT值，通过相邻数据包的RTT差值计算带宽估测参数，最后估测链路可用带宽。采用NS2仿真实验环境进行了验证，结果表明，采用AF-NEPRI算法测量链路可用带宽的结果比呆用NEPRI算法更接近实际的链路可用带宽。由此可见，采用AF-NEPRI算法估测链路可用带宽可取得良好的效果。This paper replaces the algorithm for measuring the round-trip time （RTF） in the network performance remote investigation （NEPRI） algorithm for network bandwidth measurement with the adaptive filtering （AF） algorithm, and proposes the new AF-NEPRI algorithm for bandwidth measurement. When measuring the available bandwidth using the algorithm, firstly, the data transmitter sends probe packets with different speed, then, the RTT is measured with adaptive filtering, and the parameter for estimating the available bandwidth is calculated by using the RTT difference between adjacent packets, and finally, the available bandwidth is estimated. The experiments were done using the NS2 simulation, and the results show that the measured value is closer to the actual available bandwidth using the AF-NEPRI algorithm compared with the NEPRI algorithm.

关 键 词：可用带宽 自适应滤波 往返时间(RTr) AF.NEPRI 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]