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建立了一个光载无线通信(RoF)与功率放大器(PA)结合的无线通信系统的数字预失真仿真结构,使用Matlab软件建立RoF和PA的模型,并运用间接学习结构的预失真方法和最小均方误差(LMS)算法搭建了预失真仿真系统,采用联合补偿和单独补偿两种方式的补偿结构,分析了两种结构的优缺点。通过功率谱密度图的对比,分析了两种补偿方式的效果。仿真结果表明,预失真处理有效地补偿了RoF与PA组成的无线通信系统的非线性。
A digital predistortion simulation structure of wireless communication system combining RoF and PA was established. The RoF and PA models were established by using Matlab software. The pre-distortion method and minimum mean The square error (LMS) algorithm builds a predistortion simulation system. The compensating structure of the two modes of joint compensation and single compensation is adopted, and the advantages and disadvantages of the two structures are analyzed. By comparing the power spectral density map, the effect of the two compensation modes is analyzed. The simulation results show that the predistortion processing effectively compensates the nonlinearity of the wireless communication system composed of RoF and PA.