中文摘要：

从理论证实了欠采样在基带预失真中的可行性，将欠采样用在基带预失真系统上，降低了功率放大器失真信号的采样率而完整地保留了信号中的非线性信息。最后，利用欠采样理论构建了基带预失真功率放大器系统，得到了19dB三阶交调失真的改善，与正常采样下（5倍输入信号Nyquist采样率）的三阶交调失真的改善度相比相当，从而降低了系统的复杂度及成本。

英文摘要：

The feasibility of applying undersampling in baseband predistortion amplifier is analysed, and a new baseband predistortion structure is proposed to lower down the requirement of sampling rate in baseband predistortion while maintaining the whole nonlinear information of the output signal. A baseband predistortion power amplifier system is built with undersampling theorem. The test resul shows a 19dB reduction of distortion over broadband spectra which effect equals to normal Nyquist sample rate. The system complexity and cost is reduced.