中文摘要：

为了实现无线低码率视频应用中端到端失真特性的动态分析，本文首先以图像组（GOP）为观察单元，分别对I帧和P帧进行了信源和信道的失真分析；然后分析了信道失真在GOP内的传播规律；最后在此基础上，提出了一个信源一信道联合率失真（RD）模型．该模型能根据视频序列的内容变化和信道丢包率，动态地估计出一个GOP中各帧的平均端到端失真．实验结果表明，该模型具有很好的动态性能和精确性．

英文摘要：

In order to dynamically analyze the end-to-end distortion, a new joint source-channel rate- distortion （RD） model for wireless low-bit-rate video transmission is proposed. The source and the channel distortions of I and P frames are respectively analyzed on a group of picture （GOP） ,and the propagation of distortion within the GOP is discussed. It can dynamically estimate the average end-to-end distortion of each frame in the G0P according to packet loss rate and characteristics of the video sequence. Experiments show that the accuracy of this model is satisfactory.