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arXiv 2005.05655eess.SP
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基于残差神经网络的数字预失真

Residual Neural Networks for Digital Predistortion

Yibo Wu, Ulf Gustavsson, Alexandre Graell i Amat, Henk Wymeersch

摘要:

跟踪RF功率放大器(PA)的非线性行为具有挑战性。为了解决这个问题,我们建立了残差学习和PA非线性之间的连接,并提出了一种新的残差神经网络结构,称为残差实值时延神经网络(R2TDNN)。R2TDNN不是学习PA的整个行为,而是通过在输入和输出层之间添加身份快捷连接来学习其非线性行为。特别是,我们将R2TDNN应用于数字预失真,并在一个真正的PA上测量实验结果。与Liu等人和Wang等人最近提出的神经网络相比,R2TDNN在归一化均方误差和相邻信道功率比方面以较小或相似的计算复杂度实现最佳线性化性能。此外,R2TDNN具有更快的训练速度和更低的训练误差。

英文摘要:

Tracking the nonlinear behavior of an RF power amplifier (PA) is challenging. To tackle this problem, we build a connection between residual learning and the PA nonlinearity, and propose a novel residual neural network structure, referred to as the residual real-valued time-delay neural network (R2TDNN). Instead of learning the whole behavior of the PA, the R2TDNN focuses on learning its nonlinear behavior by adding identity shortcut connections between the input and output layer. In particular, we apply the R2TDNN to digital predistortion and measure experimental results on a real PA. Compared with neural networks recently proposed by Liu et al. and Wang et al., the R2TDNN achieves the best linearization performance in terms of normalized mean square error and adjacent channel power ratio with less or similar computational complexity. Furthermore, the R2TDNN exhibits significantly faster training speed and lower training error.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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