Analytical Evaluation of the Role of Estimation and Quantization Errors in Downstream Vectored VDSL Systems

Date Added: Sep 2011
Format: PDF

The authors investigate the effect of non idealities in the diagonalizing precoder vectoring technique used for cancellation of the far-end crosstalk in downstream VDSL networks. By using analytical formulas, they estimate the average bit rate achievable as a function of both relative and absolute estimation errors. Several numerical examples are provided, in different scenarios and operation conditions. Results are presented covering an important aspect for practical applications: the transmitted power required to achieve a target bit rate, as a function of the line length. Finally, they provide some results on the impact of a smart quantization law, which limits the performance loss.