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射频功率放大器与生俱来的非线性是无线通信前端设计需要解决的核心问题之一。根据广义改进型Hammerstein功率放大器非线性模型,提出一种应用于射频功放线性化的新型数字预失真器——广义改进型Hammerstein(Generalized Augmented Hammerstein,GAH)预失真器,并给出了该预失真器的实现方法。另外,为了精确分析GAH预失真器的性能,采用实际功放的输入输出数据进行仿真和实验。被测功放为中心频率1960 MHz,带宽40 MHz,输出功率45 d Bm的Doherty功放。仿真和实验证明:提出的数字预失真器不仅计算复杂度远低于记忆多项式(Memory Polynomial,MP)和分数阶记忆多项式(Fractional Memory Polynomial,FMP)预失真器,而且其线性化能力也强于AH、MP及FMP等预失真器。
The inherent nonlinearities of RF power amplifiers are one of the core issues that need to be addressed in wireless communications front-end designs. According to the nonlinear model of generalized modified Hammerstein power amplifier, a new type of digital predistorter, Generalized Augmented Hammerstein (GAH) pre-distorter, which is applied to the linearization of RF power amplifier, is proposed. The predistortion Implementation of the method. In addition, in order to accurately analyze the performance of the GAH predistorter, the input and output data of the actual amplifier are used for simulation and experiment. The power amplifier under test is a Doherty amplifier with a center frequency of 1960 MHz, a bandwidth of 40 MHz and an output power of 45 d Bm. Simulation and experimental results show that the proposed digital predistorter not only has a computational complexity much lower than Memory Polynomial (MP) and Fractional Memory Polynomial (FMP) predistorter, but also its linearization ability is stronger AH, MP and FMP pre-distorter.