FEXT Cancellation Techniques for Multiuser DMT-VDSL Systems

Jung-Soo WOO  Gi-Hong IM  Kyu-Min KANG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E87-B   No.1   pp.1-9
Publication Date: 2004/01/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment
Keyword: 
far-end crosstalk (FEXT),  multiuser,  FEXT canceler,  frequency-domain equalizer (FEQ),  DMT-VDSL,  

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Summary: 
This paper discusses far-end crosstalk (FEXT) cancellation methods for multicarrier transmission system. A system arrangement and its tap update method are proposed when FEXT cancelers and a frequency-domain equalizer (FEQ) are jointly adapted to combat channel intersymbol interference, FEXT, and other additive noise. We present mathematical formulation of minimum mean-square error (MSE) and the optimum tap coefficients for the FEXT cancelers and the FEQ when FEXT cancellation techniques are introduced for multiuser discrete multitone (DMT) based very high-speed digital subscriber line (VDSL) transmission. It is shown that FEXT cancellation enhances the achievable bit rate in FEXT-limited systems. Computer simulation and analytical results show that the performance of jointly adapted FEXT cancelers and an FEQ is better than that of separately adapted FEXT cancelers and an FEQ.