Matrix analysis
Partial crosstalk precompensation in downstream VDSL
Signal Processing - Signal processing in communications
Crosstalk models for short VDSL2 lines from measured 30MHz data
EURASIP Journal on Applied Signal Processing
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
FEXT cancellation for twisted-pair transmission
IEEE Journal on Selected Areas in Communications
Vectored transmission for digital subscriber line systems
IEEE Journal on Selected Areas in Communications
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In this paper we analyze an adaptive downstream multichannel VDSL precoder that is based on error signal feedback. The analysis presents sufficient conditions for precoder convergence and an upper bound on the precoder steady state error. The paper also considers and analyzes the case of partial FEXT cancellation. The analysis shows that in some scenarios (and in particular in mixed-length binders) the use of partial FEXT cancellation is crucial to achieve precoder convergence in a reasonable time. Based on this analysis we determine that convergence is achievable in most practical channels. These bounds also allow for the proper setting of the convergence parameters. The paper presents several simulations to demonstrate the theoretical results. In these simulations, setting the precoder parameters according to the analysis leads to convergence in less than 400 OFDM symbols.