CMMB体系架构及其核心技术STIMI

An Introduction to CMMB Transmission Technique and STIMI

无线通信技术日新月异的发展和人们对随时随地获取传媒和信息的需求,移动多媒体广播正迎来快速发展时期。中国于2006年颁布了CMMB(中国移动多媒体广播)的相关标准。文中首先介绍了国际上比较成熟的移动多媒体广播标准以及CMMB系统的网络架构,然后介绍了CMMB传输技术STIMI(卫星地面交互式多业务体系)的各个模块。简单阐述了STIMI的信道译码技术,并通过介绍STIMI的帧结构简单分析了可用于系统同步和信道估计的资源以及方法。另外,结合STIMI的帧结构、星座映射方式和编码速率,分析了STIMI系统的净荷数据率。

Due to urgent demand of accessing anytime anywhere to the media and information and rapid development of wireless communication. A period of rapid growth of the mobile multimedia broadcasting is being ushered in China also promulgated in 2006 corresponding standards. This paper first introduces the relatively mature international standards of the mobile multimedia broadcasting as well as the network architecture of the CMMB system, then describes in detail various modules in STIMI （Satellite-Terrestrial Interactive Multiservice Infrastructure） system. From them, the paper introduces briefly the channel decoding technology in this system and analyzes the resource and technique for system synchronization and channel estimation by demonstrating the frame structure. In addition, through combining the frame structure and the constellation mapping with the coding rate, this paper analyzes the payload of the STIMI system.