高功率放大器非线性失真联合抑制方法

Joint Nonlinearity Reduction Method for High Power Amplifier

高功率放大器引入的非线性失真将导致带内信号失真、频谱扩展(邻道干扰)和误码率恶化。在剖析高功率放大器非线性输入输出特性的基础上,针对正交频分复用系统,分析了高峰平功率比问题和放大器预失真器对系统性能的影响,提出一种联合高功率放大器预失真和预留空子载波的无失真峰平功率比抑制方法。计算机仿真结果表明,所提方法在较低的输入信号功率回退条件下,能够取得较大的误码率性能改善。

Communication systems always suffer the in-band distortion, spectrum regrowth, and BER degradation since the nonlinear effect of high power amplifier （HPA）. This paper proposes a new joint nonlinearity reduction method by combining the predistorter and tone reservation using null subcarriers （TRNS） method. Tone reservation method is used to reduce the peak-to-average power ratio of the transmitted signal, while predistorter is applied to extend the dynamic range of HPA. Simulation results show that the proposed method can improve the total performance, especially, under low input back-off （IBO）.