宽带GaN功率放大器的建模与预失真

摘要

对正交频分复用传输系统中宽带GaN功率放大器的建模与预失真线性化方法进行研究.应用一个带有记忆的多项式模型来建模GaN功率放大器及其逆特性,并通过递推最小二乘法(RLS)辨识模型参数,然后利用预失真间接结构实现了GaN功率放大器的预失真器.最后,仿真验证预失真方法的有效性,结果表明记忆多项式模型可以对GaN功率放大器进行建模并实现线性化.%A modeling and predistortion linearization method is proposed for broadband GaN power amplifiers in the orthogonal frequency division multiplexing transmission (OFDM) system. Apply a memory polynomial model to modeling GaN power amplifier and its inverse characteristics, and by using the recursive least squares (RLS) identify the model parameters, and then the predistortion indirect structure realize a predistorter of the GaN amplifier. Finally, simulation results prove the effectiveness of the predistortion method, and the results show that memory polynomial model can be modeled on GaN power amplifier and realize the linearization.