| 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19 dB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。 |
| 关键词: 功率放大器 欠采样 基带预失真 三阶交调 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目（60672029） |
|
| Application of Undersampling Theorem in Baseband Predistortion Amplifier |
| CHEN Chang-wei,QIN Kai-yu |
| (Institute of Astronautics and Aeronautics, University of Electronic Science an
d Technology of China,Chengdu 610054,China) |
| Abstract: |
| The feasibility of applying undersampling in baseband predistortion amplifier
is analysed, and a new baseband pre
distortion s
tructure is proposed to lower down the requirement of sampling rate in baseband
predistortion
while maintaining the whole nonlinear information of the output signal. A baseba
nd p
redistortion power amplifier system is built with undersampling theorem.
The test resul shows a 19dB reduction of distortion over broadband spect
ra wh
ich effect equals to normal Nyquist sample rate. The system complexity and cost
is reduced. |
| Key words: power amplifier undersampling baseband predistortion IMD3 |
