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arXiv 1902.08692stat.MLcs.LG
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广义复核最小均方算法

The Generalized Complex Kernel Least-Mean-Square Algorithm

Universidad de Sevilla(塞维利亚大学);The University of Edinburgh(爱丁堡大学);The Alan Turing Institute(艾伦·图灵研究所)

Rafael Boloix-Tortosa, Juan José Murillo-Fuentes, Sotirios A. Tsaftaris

摘要:

提出了一种新的基于自适应核的复值信号回归方法:广义复值核最小均方(gCKLMS)。我们借用了作者最近提出的关于非线性回归和复值信号的宽线性再生核Hilbert空间(WL-RKHS)的新结果。本文表明,在自适应版本的核回归复值信号,我们需要包括另一个核心项,所谓的伪核。这种新的解决方案被赋予更好的表示能力,在复值领域,因为它可以有效地解耦的实部和虚部的学习。此外,我们回顾了以前实现的复杂KLMS算法及其增强版本,以证明它们可以被重写为gCKLMS的特殊情况。此外,核设计的重要结论,有助于大大提高算法的收敛性。在实验中,我们重新审视了非线性信道均衡问题,以突出gCKLMS比以前的解决方案更好的收敛性。此外,所提出的广义方法的灵活性进行了测试,在第二个实验与非独立的实部和虚部。结果表明,当复值信号的实部和虚部具有不同的特性时,gCKLMS方法的性能得到了显着改善。

英文摘要:

We propose a novel adaptive kernel based regression method for complex-valued signals: the generalized complex-valued kernel least-mean-square (gCKLMS). We borrow from the new results on widely linear reproducing kernel Hilbert space (WL-RKHS) for nonlinear regression and complex-valued signals, recently proposed by the authors. This paper shows that in the adaptive version of the kernel regression for complex-valued signals we need to include another kernel term, the so-called pseudo-kernel. This new solution is endowed with better representation capabilities in complex-valued fields, since it can efficiently decouple the learning of the real and the imaginary part. Also, we review previous realizations of the complex KLMS algorithm and its augmented version to prove that they can be rewritten as particular cases of the gCKLMS. Furthermore, important conclusions on the kernels design are drawn that help to greatly improve the convergence of the algorithms. In the experiments, we revisit the nonlinear channel equalization problem to highlight the better convergence of the gCKLMS compared to previous solutions. Also, the flexibility of the proposed generalized approach is tested in a second experiment with non-independent real and imaginary parts. The results illustrate the significant performance improvements of the gCKLMS approach when the complex-valued signals have different properties for the real and imaginary parts.

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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