Research on digital predistortion technology based on improved NLMS algorithm
Research on digital predistortion technology based on improved NLMS algorithm
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基于改进NLMS算法的数字预失真技术研究
DOI：
10.1002/mmce.22661
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发表时间：
2021-04
影响因子：
1.7
通讯作者：
Liu Qingzheng
中科院分区：
文献类型：
--
作者：
Wang Xin;Li Simin;Ye Jincai;Fan Xiangsuo;Qin Mimi;Jia Xiaobo;Wang Guofu;Liu Qingzheng
In modern communication systems, digital predistortion (DPD) improve the linearity of PA and reduce the influence of nonlinear behavior on signal transmission. When identifying the inverse model of PA with traditional variable step size algorithm, the rate of convergence is slower, easy to be effected by noise and convergence instability exists at the optimal solution, which affects the optimization degree of the whole predistortion system. In this article, a digital predistortion technique based on improved NLMS algorithm is proposed to improve the accuracy of inverse model identification, convergence rate and anti‐noise performance of the predistorter by changing the iteration function and introducing the autocorrelation matrix of the error of adjacent moments. The instability of the system at the optimal solution is reduced by introducing a new weight coefficient to update the correlation term. The simulation results show that the anti‐noise performance, convergence rate and stability of the predistortion system based on New variable step size NLMS algorithm(NVNLMS) are obviously better than NLMS, and the out‐of‐band suppression of predistortion is optimized by 10 dB compared with the original system EVM is improved by 0.0031, ACPR is improved 9.1 dB.
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DOI：
10.1109/iswcs.2008.4726067
发表时间：
2008-12
期刊：
2008 IEEE International Symposium on Wireless Communication Systems
影响因子：
--
作者：
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通讯作者：
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DOI：
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发表时间：
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期刊：
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影响因子：
--
作者：
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通讯作者：
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影响因子：
5.4
作者：
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通讯作者：
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DOI：
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发表时间：
1986-07
期刊：
IEEE Transactions on Circuits and Systems
影响因子：
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作者：
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通讯作者：
W. Mikhael;F. Wu;L. Kazovsky;G. Kang;L. Fransen
DOI：
10.1109/wicom.2008.180
发表时间：
2008-11
期刊：
2008 4th International Conference on Wireless Communications, Networking and Mobile Computing
影响因子：
--
作者：
Li Bo;G. Jian-hua;A. Bo
通讯作者：
Li Bo;G. Jian-hua;A. Bo