Next cancellation in xDSL systems using variable-length cancellers

Author

Nongpiur, Rajeev C. ; Shpak, D.J. ; Antoniou, A.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

4

fYear

2003

fDate

25-28 May 2003

Abstract

An algorithm that reduces the computational load in near-end crosstalk (NEXT) cancellation in xDSL systems is proposed. The algorithm adjusts the length of each adaptive filter according to the strength of the NEXT and thus results in a minimum usage of filter taps. The algorithm starts the NEXT cancellation by using adaptive filters with minimum filter lengths. As the adaptation progresses, the algorithm adjusts the filter length of each adaptive filter according to the magnitude of the NEXT. When all the adaptive filters have fully converged, another algorithm is used to readjust the filter length of those adaptive filters that might be too long or too short.

Keywords

adaptive filters; computational complexity; convergence; crosstalk; digital subscriber lines; NEXT cancellation; NEXT magnitude; adaptive filter length adjustment algorithm; computational load; fully converged adaptive filters; minimum filter lengths; minimum filter tap usage; near-end crosstalk cancellation; variable-length cancellers; xDSL systems; Adaptive filters; Additive noise; Background noise; Convergence; Crosstalk; Echo cancellers; Frequency; Hardware; Minimization methods; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1205844

Filename

1205844