【摘要】 前端调制器是HFC网络实现数据传输的关键设备。本文从DVB-C标准入手,给出了前端调制器组成框图,对数据接口、QAM调制、射频上变频器等主要组成模块进行了分析与讨论,给出了设计方案。最后,给出调制器的中频和射频输出信号的实测结果。更多还原

【Abstract】 The Head-end modulator is the key equipment for data transmission applied in HFC network.At first,this paper introduces DVB-C standard.With the understand of this,we put forward the conceptual block diagram of head-end modulator.The main modules of the modulator are analyzed and discussion.These modules include the data interface,QAM modulation and RF up-converter.At last,this paper presents the measuring results of medium frequency & RF signals for modulator.更多还原