Simulation and Thinking of QPSK Modulation and Demodulation

Multi-input frequency shift keyying can overcome the problem of low band utilization rate in the process of binary frequency shift keyying, and has a wide practical application range. In order to better and more intuitively understand the modulation and demodulation principle of multi-carry frequency shift keyying, this paper analyzes the modeling and demodulation of QPSK with the help of MATLAB simulation software. The simulation experimental data show that the simulation results and the theoretical analysis content are consistent, which verifies the correctness of the simulation model. QPSK RF direct modulation anti-interference ability, high transmission code rate and high reliability can be applied to the environment of remote sensing satellite communication.