在无线通信系统中,高功率放大器因其非线性,导致AM/PM效应使得微分相位、微分增益和互调失真变坏。高质量的通信系统设计应尽可能减小功率放大器的AM/PM效应。因此,针对宽带码分多址(WCDMA)功放的非线性失真问题,采用一种基于查找表(LUT)的自适应预失真方法,改善功放的非线性失真。仿真表明,该方法能有效补偿放大器产生的AM-AM、AM-PM失真,并将功放的邻道功率泄漏比(ACPR)改善到30dB左右。
- Abstract:
- In wireless communication systems,the nonlinearity of high power amplifier(HPA)always cause AM/PM effect.The existence of AM/PM effect makes differential gain,differential phase and intermodulation distortion become worse.Therefore,linearization technique is needed to suppress the AM/PM effects.In this paper,a LUT based predistortion method is used to deal with the distortion of WCDMA power amplifier.Simulation shows that this method can effectively adjustment of the AM-AM and AM-PM curves,and the ACPR can be improved by30dB.
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