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: |
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基金项目:国家自然科学基金资助项目(60672029) |
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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 |