基于遗传算法的功放预失真器模型研究与实现

Research and Implementation of Power Amplifier Predistorter Model Based on Genetic Algorithm

针对功放的非线性特性,建立预失真补偿器的数学模型,并用遗传算法对该模型进行求解和验证,最后通过归一化均方误差和误差矢量幅度2个评价指标对预失真处理器数学模型和遗传算法的准确性以及合理性进行定量验证,得出基于遗传算法的预失真处理器模型具有较高的准确性,能很好地补偿功放的非线性特性。

Based on the nonlinear characteristic of power amplifier,the mathematical model of pre-distortion compensator is established,and this model is solved and validated by using genetic algorithm.Finally,the normalized mean square error（NMSE） and error vector magnitude（EVM） are used to quantitatively verify the accuracy and rationality of the predistorter model and the genetic algorithm,based on which some conclusions can be obtained,such as the genetic algorithm based predistorter model is of high accuracy,and can effectively compensate the nonlinear characteristic of the power amplifier and so on.