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Adaptive decision feedback equalisation of line signals in electrical communications

机译：电气通信中线路信号的自适应决策反馈均衡

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Method and circuit arrangements for adaptive decision feedback equalisation of line signals in electrical communications /H0 In high-speed digital signal transmission, the incoming line signal presents post-oscillations due to shortcomings in the transmission path. These post-oscillations can be cancelled with an adaptive decision feedback equaliser. In order to achieve a high convergence speed, it is known for the adjustment step factor which is required for coefficient calculation to be designed as variable. If relatively long post-oscillations are intended to be completely cancelled with an echo canceller of this type comprising a single adaptive transverse filter, this filter must have an economically unviable number of elements. Furthermore, a large number of elements allows only a small adjustment step factor, which restricts the ability to achieve a high convergence speed. The object is to achieve a high convergence speed at low cost, even in the case of long post-oscillations. A second non-adaptive filter (RF) is connected downstream of the adaptive transverse filter (AF). Further features indicate, inter alia, how the variable adjustment step factor (v) can be obtained (Fig. 1). The invention is suitable for use in the transmission modules of the integrated services digital telecommunications network (ISDN). IMAGE
机译：在电通信中用于线路信号的自适应判决反馈均衡的方法和电路安排在高速数字信号传输中，由于传输路径中的缺点，输入线路信号会出现后振荡。这些后振荡可以通过自适应决策反馈均衡器消除。为了达到高的收敛速度，已知将系数计算所需的调节阶跃因子设计为可变的。如果打算用包括单个自适应横向滤波器的这种类型的回声消除器来完全消除相对较长的后振荡，则该滤波器必须具有在经济上不可行的元件数量。此外，大量的元件仅允许小的调整步长因子，这限制了实现高收敛速度的能力。目的是即使在较长的后振荡情况下也以低成本实现高收敛速度。第二非自适应滤波器（RF）连接在自适应横向滤波器（AF）的下游。其他特征尤其指出如何获得可变调节阶跃因子（v）（图1）。本发明适用于综合业务数字电信网（ISDN）的传输模块。 <图像>

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