摘要
通过调节发送端发送速率的方法对缓冲区长度进行调整是多媒体同步中常用的方法,为了更好地通过控制理论研究多媒体同步问题就必须得到缓冲区长度与发送速率之间的准确模型.为此在NS2网络仿真平台下构建了一个流媒体播放系统,使用系统辨识的方法对速率控制模型进行了辨识,利用最小二乘法对实验数据进行了分析,数据分析结果表明流媒体速率控制模型具有积分时滞特性.实验证明了辨识的模型是准确的.
It is common to regulate transmission rate from sending terminal to get a proper buffer length in multimedia synchronization. It is necessary to develop an accurate model between buffer length and transmission rate so as to apply the control theory to multimedia synchronization. A streaming media system is thus constructed on the NS2 to identify the rate control model via system identification. Analyzing the experimental data by the least squares estimator, the results showed that the rate control model of streaming media has the characteristic of integral time lag and verified that the identifying model is accurate.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第11期1566-1569,共4页
Journal of Northeastern University(Natural Science)
基金
教育部高等学校科技创新工程重大项目培育基金资助项目(708026)
关键词
多媒体同步
流媒体
速率控制
系统辨识
缓冲区
multimedia synchronization
streaming media
rate control
system identification
buffer
