Abstract: In order to improve the operation parameters and optimize the communication performance of the current communication system, the principle and control simulation experiment method of digital communication system based on Matlab is proposed. The simulation model of digital communication system is constructed, and the basic characteristics of its operation are analyzed. The simulation program of digital communication system is divided into three parts: simulation modeling, experiment and analysis. According to the design interface of communication toolbox in Matlab software, the simulation experiment of Matlab is divided into time flow simulation experiment based on Simulink platform and data flow simulation experiment based on Matlab workspace. The bit error rate of digital signal baseband in transmission process is selected as an example to carry out data flow simulation experiment, and the adaptive antenna research is taken as an example to carry out time flow simulation experiment. The experimental results show that the Matlab tool can adjust the system parameters flexibly in the simulation test of digital communication system, so as to optimize the system operation effect.

Key words: Matlab, digital communication system, communication simulation technology, Simulink platform