【摘要】 为解决流媒体系统中基于多描述编码的多树模型所存在的同步问题,提出了一种基于多描述编码的层次组播模型。该模型中,相邻层的节点之间采用多对一的传输方式,并通过描述资源的均匀分布实现系统的快速收敛,以最大覆盖算法为节点获取最大的描述集和请求分布,在获得高质量视频的同时提高系统的鲁棒性。仿真实验表明,该模型以较小的协议开销获得了较好的视频质量,实现了动态环境中较高的系统可靠性。更多还原

【Abstract】 This paper proposed a novel hierarchical multicast model based on multiple description coding to address the synchronization of descriptions in multiple trees for streaming media system. Many to one transmission style was adopted within the neighboring layers,achieved fast convergence by uniform distribution of descriptions,and the maximum description set and request covering were worked out with maximum covering algorithm to achieve the robustness of system and high video quality simultaneously. Simulation experiments demonstrate that good video quality and high reliability in dynamic situation are achieved with low overhead.更多还原