实时多媒体流控中的自适应Smith预估器设计  

Design of Self-adaptive Smith Predictor for Flow Control in Real-time Multimedia Communication

作　　者：祁红岩[1] 冯丽媛[1] 

机构地区：[1]黑龙江科技学院,黑龙江哈尔滨150001

出　　处：《计算机仿真》2008年第6期117-119,133,共4页Computer Simulation

摘　　要：设计了一种基于自适应Smith的实时多媒体流量控制器。采用反馈控制机制进行实时多媒体流量控制是一种有效解决方法,但因实时多媒体流量控制及性能要求的特殊性,仅采用传统的反馈控制技术难以消除这一缺点。针对此问题,在速率反馈控制理论框架的基础上,将先进控制理论中的一些思想方法运用到VOD的流量控制中,采用改进的自适应Smith预估器进行反馈控制。由实验结果表明,提出的方法具有一定的有效性,克服由于扰动和传输延迟带来的不利影响,提高了播放质量。The paper designs a real - time multimedia communication for flow control based on self - adaptive Smith predictor. The feedback control mechanism for the real - time multimedia traffic control is discussed. Due to the particularity of real - time multimedia flow model and performance demand, it is difficult to overcome the deficiency only by adopting conventional feedback control technology. In the light of these problems, on the basis of the control theory scheme of rate - based traffic control, an advanced control idea is applied to the traffic control in VOD, and self - adaptive Smith predictor is designed. The experimental results show that the arithmetic presented in the paper overcomes the adverse effect caused by propagation delay and jitter. The play quality is improved.

关 键 词：实时多媒体 延迟抖动 自适应预估器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]