模拟或数字预失真方法提供了线性与效率。现代RF放大器既需要线性也需要高效率。线性要求是源于现代调制方法的使用,如QAM(正交幅度调制)和OFDM(正交频分多址调制,参考文献1)。这些放大器还需要效率,以降低功耗和减少散热。开发人员通常将现代RF放大器组件装在天线杆内。这些“杆顶”放大器的设计中,外壳可以不含风扇且直接暴露在日光下。在功耗上每节省1W,就意味着少了 Analog or digital predistortion methods provide linearity and efficiency. Modern RF amplifiers require both linearity and high efficiency. The linearity requirement stems from the use of modern modulation methods such as QAM (Quadrature Amplitude Modulation) and OFDM (Orthogonal Frequency Division Multiple Access, Reference 1). These amplifiers also require efficiency to reduce power consumption and reduce heat dissipation. Developers usually install modern RF amplifier components in the masts. In the design of these “pole top” amplifiers, the enclosure can be fanless and exposed to direct sunlight. Every 1W of power savings means less