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ICC
2008
IEEE

Optimal Precoding for Digital Subscriber Lines

8 years 9 months ago
Optimal Precoding for Digital Subscriber Lines
—We determine the linear precoding policy that maximizes the mutual information for general multiple-input multiple-output (MIMO) Gaussian channels with arbitrary input distributions, by capitalizing on the relationship between mutual information and minimum mean squared error (MMSE). The optimal linear precoder can be computed by means of a fixedpoint equation as a function of the channel and the input constellation. We show that diagonalizing the channel matrix does not maximize the information transmission rate for nonGaussian inputs. A full precoding matrix may significantly increase the information transmission rate, even for parallel non-interacting channels. We illustrate the application of our results to typical Gigabit DSL systems.
Fernando Pérez-Cruz, Miguel R. D. Rodrigues
Added 30 May 2010
Updated 30 May 2010
Type Conference
Year 2008
Where ICC
Authors Fernando Pérez-Cruz, Miguel R. D. Rodrigues, Sergio Verdú
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