一种卫星移动多媒体广播COFDM系统的可用性研究

An Investigation on Usability of COFDM System in Satellite Mobile Multimedia Broadcasting

旨在研究COFDM系统应用在卫星移动多媒体广播中的可用性,文章给出一种基于“级联编码+相干检测+PN序列信道估计”方案的COFDM系统的基带模型,并对其进行了建模与仿真,具体内容包括收发端主要模块的系统构架设计以及信道干扰模型的设计与分析,然后给出基于本仿真所得到的系统误码率在卫星移动多径衰落传输环境中的变化情况,并且分析了仿真结果,最后验证了这种COFDM系统在卫星移动多媒体广播领域中的可用性。

This paper aims at investigation of the usability of COFDM system applied in Satellite Mobile Multimedia Broadcasting. Above all, it proposes a COFDM baseband model which is based on a so-called ＂Cascaded Coding ＊ Coherent Detection ＊ PN Channel Estimation＂ scheme. Next, after simulating and analyzing the architecture of this COFDM transreceiver and some channel interference factors, the system BER performance that is tested under satellite mobile multipath fading environment is given and evaluated. As a result, it is demonstrated and verified that this COFDM system could be successfully applied in Satellite Mobile Multimedia Broadcasting and its usability is obvious.