BER Performance Modeling and Simulation of QPSK System in Multi-Path Fading Channel

This paper studies the bit error rate (BER) performance of QPSK (four-phase shift keying) system in multi-path fading channels. The mathematical model of multi-path fading channel is established, and the system simulation is carried out using MATLAB software platform. In this paper, the characteristics of multi-path fading channel and its influence on BER performance of QPSK system are analyzed first, and then the corresponding simulation model is established to complete the BER simulation design of QPSK in multi-path channel, and the simulation results under different fading scenarios are compared and analyzed. The results show that the BER performance of QPSK system is significantly affected under multi-path fading channels, in which frequency-selective fading has the most significant negative effect on the performance.