实时流媒体系统中喷泉码的度分布设计  

Design of Fountain Codes Degree Distribution for Real-time Streaming Media System

作　　者：蒋维[1] 孟利民[1] 林梦嫚 应颂翔[1] 

机构地区：[1]浙江工业大学信息工程学院浙江省通信网技术应用研究重点实验室,杭州310023

出　　处：《小型微型计算机系统》2016年第8期1848-1853,共6页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61372087)资助

摘　　要：实时流媒体数据业务由于网络服务的多媒体化受到人们的广泛关注.针对实时流媒体业务在IP网络上传输由于丢包、延时等现象引起的质量问题,本文利用数字喷泉技术,对H.264实时视频设计了一种具有不等差错保护的系统喷泉码的度分布,用以改善实时流媒体数据在IP网络上传输的性能.设计了一种I帧分布,能够根据信道删除率对H.264视频的I帧数据包进行高等级保护,接收方能以较高的概率优先恢复出I帧数据.仿真结果表明:在信道删除率确定的情况下,与同等差错保护的鲁棒分布相比,使用I帧分布能得到更高PSNR值的视频流,同时具有更短的解码延时,系统的性能得到较大的改善.Real time multimedia streaming service gained an extensive attention due to the boost of multimedia network service. Real- time streaming transmission on IP network may suffer packet loss ,delay and other quality problems. By using digital fountain technology, we designed a kind of systematic fountain codes degree distribution for H. 264 real-time video with unequal error protection to improve the real-time streaming transmission performanceover IP network. This I frame degree distribution could protect I frame of H. 264 data with high probability and the receiver has a higher probability to restore I frame data. Simulation results show that given a certain channel packet loss rate, using I frame degree distribution could gain higher PSNR video stream and shorter decoding delay compared to the equal error protection with robust distribution, which improves the performance of real time streaming media transmission system.

关 键 词：数字喷泉 H.264 I帧分布 不等差错保护 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]