基于 Clarke-Jakes 模型的 QPSK 与 16QAM 调制性能对比研究

Based on the Clarke-Jakes model, this paper constructs a simulation platform for Rayleigh fading channels, and compares and analyzes the bit error rate (BER) performance of QPSK and 16QAM in additive white Gaussian noise (AWGN) channels and Rayleigh fading channels. By deriving the channel impulse response of the Clarke-Jakes model and combining with the theoretical BER formula, the anti-noise and anti-fading characteristics of the two modulation methods are verified through Matlab simulation. The results show that QPSK has better anti-noise and anti-fading performance and is suitable for low signal-to-noise ratio scenarios; 16QAM has higher spectral efficiency, but is more sensitive to noise and fading, and needs to exert its advantages in high signal-to-noise ratio environments. The research provides a simulation basis for the dynamic selection of modulation methods in actual communication systems and has theoretical and engineering value for optimizing adaptive modulation strategies.