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Theory and experiments of a low sampling frequency broadband digital predistortion with cyclostationarity
International Journal of Satellite Communications and Networking ( IF 1.7 ) Pub Date : 2020-07-27 , DOI: 10.1002/sat.1368
Rong Lan 1, 2 , Xin Hu 3 , Gang Wang 1, 2 , Jirun Luo 1, 2 , Yi Yang 1, 2 , Jingyan Song 1, 2
Affiliation  

To reduce the sampling rate from analog to digital converter for the feedback loop of digital predistortion (DPD) in a microwave power amplifier (MPA), a model was proposed and used to obtain the formulae for the cyclostationarity of the digital modulation signal, which shows that the nonlinear parameter of the MPA model is only determined by the correlation matrix of the signal and can be estimated with the under‐sampled output signal. The output signal of the MPA, similar to a high sampling rate, can be recovered by combining the nonlinear parameter with the input signal. Then the DPD of the MPA is implemented through indirect learning architecture to realize its linearization. A Ka‐band traveling wave tube amplifier is used to the circuit for performing a low sampling rate DPD process to validate the rationality of the proposed model and formulae.

中文翻译:

具有循环平稳性的低采样频率宽带数字预失真的理论和实验

为了降低微波功率放大器(MPA)中数字预失真(DPD)反馈环路的模数转换器的采样率,提出了一个模型并将其用于获得数字调制信号的循环平稳性公式, MPA模型的非线性参数仅由信号的相关矩阵确定,并且可以通过欠采样输出信号进行估计。通过将非线性参数与输入信号组合,可以恢复MPA的输出信号,类似于高采样率。然后通过间接学习架构实现MPA的DPD,以实现其线性化。
更新日期:2020-10-05
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