基于PCM和基带传输对通信系统的设计  

Design of Communication System Based on PCM and Baseband Transmission

作　　者：张家伟 ZHANG Jia-wei(Chongqing Jiaotong University,Chongqing 400000,China)

机构地区：[1]重庆交通大学,重庆400000

出　　处：《通信电源技术》2020年第4期129-131,共3页Telecom Power Technology

摘　　要：利用在通信仿真方面应用广泛的设计软件--e-labsim_c、Visual Studio结合通信原理的内容,设计一个结合PCM、码型变换和2FSK调制的通信系统。对一个幅值不超过2 V的模拟信号进行采样、量化和编码,接着对编码后的码流进行FSK调制,1和0用不同频率的载波进行调制,同时对PCM编码得到的码流进行码型变化变成双极性码在示波器上显示,最后对PCM进行解码输出。为了直观地体现量化地原理和简化编写代码,自行设计了量化的规则。Acommunication system combining PCM,code transformation and 2FSK modulation is designed by using the design software e-labsim? C and visual studio which are widely used in communication simulation. By sampling,quantizing and coding an analog signal whose amplitude is no more than 2 V,FSK modulation is carried out on the coded code stream,1 and 0 are modulated with different frequency carriers,and the code type change of the code stream encoded by PCM is turned into bipolar code which is displayed on the oscilloscope. Finally,the PCM is decoded and output. And in order to embody the principle of quantification and simplify the code writing,the quantization rules are designed.

关 键 词：通信系统 PCM 抽样量化编码 码型变换 

分 类 号：TN914[电子电信—通信与信息系统]