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DSL Advances by Peter J. Silverman, John M. Cioffi, Massimo Sorbara, Thomas Starr

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2.4. Equalization

Equalization is a term generally used to denote methods employed by DSL receivers to reduce the mean-square ISI. The most common forms of equalization for DSLs appear in this subsection.

2.4.1. Linear Equalization

Linear equalizers are very common and easy to understand, albeit they often can be replaced by nonlinear structures that are less complex to implement and that work better, but are harder to understand. Nonetheless, this study begins with linear equalization and then progresses to better equalization methods in later subsections. The basic idea of linear equalization is to invert the channel impulse response so that the channel exhibits no ISI. However, straightforward filtering would increase the noise substantially, ...

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