通信技术概论文思创新软件技术有限公司目录第一章通信与通信系统概述............................................................................................................11.1信号与系统..........................................................................................................................21.1.1信号.................................................................................................................................21.1.2系统.................................................................................................................................31.2通信系统的组成及工作原理................................................................................................31.2.1信源.................................................................................................................................41.2.2发送变换器.....................................................................................................................41.2.3信道...........................................................................................................................41.2.4接收变换器......................................................................................................................51.2.5通信系统..........................................................................................................................51.3通信系统的分类................................................................................................................61.3.1按信源划分类............................................................................................................61.3.2按传输媒介分类.......................................................................................................71.3.3按传输信号的特征分类............................................................................................7第二章信号的传输与交换...................................................................................................112.1模拟信号的调制与传输.....................................................................................................122.1.1线性调制(幅度调制)....................................................................................................122.1.2非线性调制(角度调制)................................................................................................一三2.1.3频分复用()............................................................................................................一三2.2模拟信号的数字化一一脉冲编码调制()..................................................................一五2.2.1模拟信号数字化的方法................................................................................................一五2.2.2时分复用....................................................................................................................一八2.2.3数字基带传输系统...............................................................................................222.2.4数字调制传输.............................................................................................................232.3数字信号的传输系统.......................................................................................................242.3.1有线传输系统......................................................................
