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深空通信为了得到高的放大效率,需要使功放运行点在饱和状态,由此产生的功率放大器的非线性,使信号产生了失真,预失真是抵抗信号失真的重要方法。文中根据陆地端发射放大器和空间功率放大器的不同,采用了不同的预失真方式,即分别采用信号预失真和数据预失真,对二者性能进行比较分析。最后得出结论,在不同场景下应该使用的相应的预失真技术。
Deep space communication In order to obtain high amplification efficiency, the operating point of the power amplifier needs to be saturated. The resulting nonlinearity of the power amplifier distorts the signal. Predistortion is an important method to resist signal distortion. In this paper, different predistortion modes are adopted according to the difference between the land-side transmit amplifier and the space power amplifier, that is, the signal predistortion and data predistortion are respectively used to compare the performance of the two. Finally, we concluded that the corresponding predistortion techniques should be used in different scenarios.