A method to analyze the anti-interference capability of digital communication system

In this paper, a behavior-lever model is introduced to analyze communication system. In the article, first establishing the transmitter and receiver model corresponding with QPSK modulation and demodulation , and running a simulation of ideal communication link ; then based on the simulation of the model´s performance on of Gaussian noise , The model´s Correctness and effectiveness can be validated. At last a simulation method is proposed, which can get the anti-interference performance of the receiver, and has important guiding significance on communication system design and frequency allocation.