【摘要】 根据Hammerstein模型的一种最优两步辨识算法的思路,针对预失真技术的特点对Hammerstein模型进行了两次转换,建立了一种等效的但形式简单的记忆非线性预失真器模型——非线性抽头延时多项式模型,从而简化了Wiener功放的预失真。仿真结果表明,利用所提出的记忆预失真器模型能使用较少的参数,快速、简便地实现记忆放大器的预失真,而且具有满意的线性化性能。更多还原

【Abstract】 According to the idea of an optimal two stage identification algorithm for Hammerstein nonlinear systems and the characteristics of the predistortion,two steps transform could be given to Hammerstein model and a simplified nonlin-ear model with memory,nonlinear tapped delay line(NTDL) model,was achieved.The predistortion of Wiener PA can be greatly simplified using the NTDL model.Simulation results demonstrate that the proposed predistortion method can effectively realize the linearization of Wiener PA,and moreover,only small number of model coefficients is required for satisfactory performance.更多还原