基于平方根无迹卡尔曼滤波的数字预失真算法

射频功率放大器工作在近饱和点时产生的非线性效应是制约其性能提升的主要因素。 提出了一种基于非线性无迹卡尔曼滤波的数字预失真算法，可有效克服此非线性效应的影响 。针对预失真算法的状态方程为线性的特点，优化了无迹卡尔曼滤波算法以提高运算效率。 仿真结果表明，所提算法性能优于传统的基于最小均方的数字预失真算法。

A novel digital predistortion algorithm based on square root unscented Kalman filter

The nonlinear effect of power amplifier working near the saturation po int becomes the main factor that degrades its performance. In this paper,a Digit al Predistortion(DPD) algorithm based on the nonlinear Unscented Kalman Filter(UKF) is proposed, whi ch can effectively remove the nonlinear effect. The DPD algorithm is modified an d optimized, according to the fact that the state equation is linear in the DPD algorithm, so that the computational efficiency is improved consequently. The si mulation result verifies that the performance of the proposed algorithm is bette r than that of the traditional DPD algorithm based on Least Mean Sq uare(LMS).