HPA非线性对高阶调制的影响分析与仿真

Analysis and Simulation of HPA Nonlinearity's Effect on High Order Modulation

文章基于经典的功放Saleh非线性模型,研究信道非线性对不同高阶调制方式的影响,应用Matlab仿真软件,对通过非线性功放后的在不同输入功率回退条件下,信号的星座图、功率谱、误码率进行仿真。结果表明,多进制幅相键控(M-ary amplitude phase keying,MAPSK)相对多进制正交幅度调制(Multiple quadrature amplitude modulation,MQAM)、多进制相移键控(Multiple phase shiftkeying,MPSK)具有更好的抗HPA非线性的性能。

Data rate is higher in modern satellite communication system, so the order of modulation type is higher. Based on the classical PA nonlinear model-Saleh model, effect of nonlinear channel on the different high order modulation is researched. Constellation and power spectrum and error rate are analyzed on the Matlab platform with different IBO. Simulation results show that MAPSK modulation has more performance of antinonlinearity than MQAM and QPAK modulation.