功率放大器失真问题研究及预失真建模

电子器件中的功率放大器常常伴随着非线性失真效应.为解决此类非线性失真问题,通过研究无记忆和有记忆功放的失真特性,运用最小二乘法来构建多种形式的特性拟合函数,在选择了效果较好的特性拟合函数基础上,根据实际约束条件进行预失真模型的建立,使失真处理后的输出信号趋于线性,最后从信号的功率谱密度的角度出发检验预失真模型的补偿效果,证明模型具有较好的可行性和准确性.

Power Amplifier Distortion Research and Pre-distortion Modeling

As electronic devices,power amplifiers are often accompanied with nonlinear distortion effects.To solve these nonlinear distortions,this paper studies characteristic of distortions in memoryless power amplifier and memory power amplifier.By using the least squares method to build various kinds of functions to fit the distortions,it's able to choose a better fitting function as the basis of pre-distortion modeling,then combine with actual constraints to establish the pre-distortion model.So after the process of pre-distortion,the output signals will become linear to input.At last,from the respect of the power spectral density ofr signals experiments have been conducted to verify the compensation effect of predistortion model,which shows that this model has good feasibility and accuracy.