A Novel Decision Feedback Equalization Structure for Nonlinear High-Speed Links

Abstract

As the degree of nonlinearity in high-speed links becomes more and more serious, traditional decision feedback equalization (DFE) which is based on linear time-invariant assumption can no longer eliminate the inter-symbol interference effectively. In this paper, the shortcomings of traditional DFE structure for nonlinear high-speed links are first analyzed. Then, the multi-bit response (MBR) method is proposed to accurately construct the bit stream responses of the nonlinear high-speed links. Lastly, a novel DFE structure based on the MBR method is presented to improve the signal quality of the nonlinear high-speed links. The accuracy of the proposed method is verified by the simulation based on a nonlinear high-speed link model. Compared with traditional DFE, the proposed DFE structure can significantly improve the signal quality of the nonlinear high-speed links. As the degree of nonlinearity increases, the advantage of the proposed DFE becomes more prominent. INDEX TERMS Decision feedback equalization (DFE), inter-symbol interference (ISI), multi-bit response, nonlinearity, signal integrity.

Multi-Agent Feedback Enabled Neural Networks for Intelligent Communications

“…Li et al further proposed an adaptive decision feedback equalizer using error feedback, which not only improves the performance, but also weakens the error propagation in [20]. In recent years, to further conquer the nonlinearity in high-speed channels and the large delay spread in the underwater acoustic channels, the enhancement DFE based equalization methods are proposed in [21] and [22].…”