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对OFDM传输系统中大功率放大器非线性失真的数字自适应预失真技术进行了研究。利用有理双线性函数的非线性能较好地逼近大功率放大器的AM AM或AM PM非线性特性及其逆变换易于求解的特性 ,提出了一种新的数字自适应预失真方法 ,它是对估计器的输入幅度进行均匀量化 ,用一个估计器对大功率放大器的非线性特性进行估计 ,通过训练估计器的参数去调节预失真器的非线性参数 ,以达到预失真补偿的目的。与以前的方法比较 ,该方法用于正交频分复用 (OFDM )系统中具有收敛速度快、系统性能稳定、补偿效果好等特点
The digital adaptive predistortion technique of nonlinear distortion of high power amplifier in OFDM transmission system is studied. Using the nonlinear performance of rational bilinear function to approximate the AM AM or AM PM non-linearity characteristics of high-power amplifier and its easy to solve inverse transform, a new digital adaptive predistortion method is proposed The input amplitude of the estimator is uniformly quantized. An estimator is used to estimate the nonlinear characteristics of the high power amplifier. The parameters of the training estimator are used to adjust the nonlinear parameters of the predistorter so as to achieve the purpose of pre-distortion compensation. Compared with the previous methods, the proposed method is suitable for orthogonal frequency division multiplexing (OFDM) system with the characteristics of fast convergence, stable system performance and good compensation effect