摘要
介绍了CMMB标准的关键技术,分析了物理层的纠错编码方案,基于该编码方案提出了应用层的LT编码构造方法,阐述了编译码方法,仿真结果表明,该方法能有效增加信元恢复能力,从而提高系统抗删除性能,能适用于基于数据包传输的移动多媒体广播信道,特别是要求无误码的数据下载与传输业务。
This paper describes the key technologies in CMMB standard, and analyzes the scheme of error correction coding in physical layer. Based on this coding scheme, a method for LT coding structure in application layer is proposed and described. Simulation results show that it can effectively enhance restoration ability of information elements, and therefore improve the perfor mance of the system against erasion. It is suitable for mobile multimedia broadcasting channels, especially for the data downloading and transmission services in which error free is required.
出处
《电视技术》
北大核心
2007年第3期37-39,共3页
Video Engineering
基金
国家空间微波技术实验室基金项目(51473030105JB3201)
关键词
LT码
中国移动多媒体广播
译码概率
删除信道
LT coding
chinese mobile multimedia broadcast（CMMB）
decoding probability
bit erase channel
