基于Raptor码的多媒体推送系统的设计与实现

Design and Implementation of Multimedia Push System Based On Raptor Codes

推送服务实质上是根据用户事先预定的多媒体信息,对其进行筛选后,在适当的时候推送到用户所需的终端,用户开机后可选择性地接收,文件可离线使用,反复使用。本文设计的多媒体推送系统是点对多点的基于单向通道的多媒体广播,采用android平台作为接收终端,主要针对当前不同用户信道状况的差异性以及点对多点广播过程中数据包丢失严重的问题,将Raptor码应用在多媒体推送系统中。经过仿真试验测试,该系统稳定性高,文本、图片、视频等多媒体信息可在局域网内快速实时地推送并显示,达到了预期的目的。

Push technology is essentially a technology which do screening based on the multimedia information according to the user＇ s demand, and push the information to the user＇ s terminal at the appropriate time. User can selectively receive the documents which were available for offline use and repeated use. Multimedia push systems in this paper is the point - to - multipoint multimedia broad- cast , android plate as the receiving terminal, make advantage of Raptor code to well solve the current problem of great difference be- tween user＇ s channel condition and the great packet loss in muhipoint broadcasting process. During the simulation test, the system was stable, the multimedia information such as texts, images, videos can be pushed quickly in the LAN in real time and displayed success- fully which achieved the intended purpose.