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2D Piecewise Digital Predistortion for Dual-Band Power Amplifiers Based on Self-organizing Map

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Abstract

This paper presents a new piecewise two-dimensional (2D) digital predistortion (DPD) method for dual-band power amplifiers (PAs). A self-organizing map network is used to divide dual-band signals into different regions. Then, a principal component analysis algorithm is used to reduce the number of predistortion coefficients in each region. The proposed method is stable in finding the optimum region ranges and can achieve a good balance between the system complexity and model accuracy. To validate proposed method, a dual-band WCDMA signal and a dual-band OFDM signal are employed. The device under test is a GaN PA with a peak output power of 6 W. The adjacent channel power ratio and normalized mean square error measurement results for both cases demonstrate that the new piecewise DPD method can obtain better linearization performance with fewer coefficients.

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Acknowledgements

This work was supported by the National Science Foundation of China: (Grant Number U1705263) and the Science and Technology Plan Project of Fujian Province, China: (Grant Number 2017H0041).

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Authors and Affiliations

  1. School of Electronic Science and Engineering, Xiamen University, Xiamen, China

    Xiaofang Wu, Liangwen Jin, Jianpeng Zhu & Xinshuo Cai

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  1. Xiaofang Wu
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  2. Liangwen Jin
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Correspondence to Xiaofang Wu.

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Wu, X., Jin, L., Zhu, J. et al. 2D Piecewise Digital Predistortion for Dual-Band Power Amplifiers Based on Self-organizing Map. Circuits Syst Signal Process 39, 3206–3218 (2020). https://doi.org/10.1007/s00034-019-01298-5

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  • DOI: https://doi.org/10.1007/s00034-019-01298-5

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