本设计通过利用VB 编写用户操作界面和MATLAB 实现后台运算及图形处理的混合编 程的方法，来完成对通信原理仿真系统的开发。设计中采用ActiveX 技术来实现VB 和MATLAB 之间的通信，在VB 应用程序内创建MATLAB ActiveX 对象，实现对MATLAB 的调用，最终 仿真实现信源编码解码、模拟调制解调、数字基带传输、数字调制解调等功能。-This design user interface written using VB and MATLAB computing and graphics processing to achieve the background of mixed programming method, to complete the simulation system for the development of communication theory. Design using ActiveX technology to achieve communication between VB and MATLAB, the VB application, create a MATLAB ActiveX object, call the MATLAB implementation, to achieve the ultimate source codec simulation, analog modem, digital baseband transmission, digital modulation and demodulation functions.