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Volterra based nonlinear equalizer with reduced complexity

机译：基于Volterra的非线性均衡器，复杂性降低

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摘要

A model for a reduced complexity nonlinear electrical equalizer based on the Volterra theory is presented which can be utilized to mitigate dispersion and other distortions in optical communication systems. In recent years several electronic equalizers like the feed forward equalizer (FFE), the decision feedback equalizer (DFE) and the maximum likelihood sequence estimator (MLSE) were intensively investigated in optical communication systems. Also, nonlinear FFE/DFE structures based on the Volterra theory were proposed. These nonlinear equalizers can mitigate the effects of dispersion much better than the classical FFE/DFE but are more complicated to build. In a practical system the Volterra nonlinearity is therefore limited to second and third order. However, the number of filter coefficients for such a nonlinear FFE of appropriate order (e.g. 5 taps) is still very high for the nonlinear parts. This results in a very high effort in the equalizer control and optimization algorithm and makes a practical implementation questionable. In this Paper we present a reduced model for Volterra based nonlinear equalizers were the order of the nonlinear parts can be set separately from the linear order. This results in less complex filter structures as the number of coefficients is reduced drastically.
机译：提出了一种基于Volterra理论的减少复杂性非线性电均衡器的模型，其可用于减轻光通信系统中的色散和其他扭曲。近年来，在光通信系统中集中研究了馈电前转均衡器（FFE），判定反馈均衡器（DFE），判定反馈均衡器（DFE）和最大似然序列估计器（MLSE）的几个电子均衡器。此外，提出了基于Volterra理论的非线性FFE / DFE结构。这些非线性均衡器可以减轻分散的影响，而不是经典的FFE / DFE更好，但更复杂。在实际系统中，Volterra非线性因此限于第二和三阶。然而，对于非线性部件，这种非线性FFE的滤波器系数的数量仍然非常高。这导致均衡器控制和优化算法中的非常高的努力，并实现了实际实现可疑。在本文中，我们介绍了基于Volterra的非线性均衡器的减少模型是非线性部件的顺序可以与线性顺序分开设置。这导致较差的滤波器结构，因为系数的数量大幅度减小。

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