ISSN 1991-2927
 

ACP № 4 (58) 2019

Numerical aspects of far-end crosstalk cancellation in Vdsl downstream

Innokentiy Vasilyevich Semushin, Ulyanovsk State University, Doctor of Science in Engineering, Professor of Information Technology at Ulyanovsk State University. Memberships in Professional Organizations: IEEE Society; IEEE Control SystemsSociety. Author of papers, monographs, and textbooks; holds patents for inventions. Field of interest: Systems and signals theory; computational mathematics. [e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. ]I. Semushin,

Yulia Vladimirovna Tsyganova, Ulyanovsk State University, Doctor of Science in Physics and Mathematics, Professor of Information Technology at Ulyanovsk State University. Author of papers, a monograph, and textbooks; holds State Registration Certificates of computer programs. Field of interest: Parameter identification and adaptive filtering; numerically efficient algorithms for stochastic systems. [e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. ]Y. Tsyganova

Numerical Aspects of Far-end Crosstalk Cancellation in Vdsl Downstream 54_9.pdf

A complexity analysis of computations involved in two precoding methods - Zero Forcing (ZF) vs. a Simplified Linear (SL) - in the context of a Very high-speed Digital Subscriber Line (VDSL) is presented in this paper. For the ZF-precoding technique, eight computing strategies have been compared, four of which entail the explicit calculation of inverse normalized channel matrices and other four do not. In addition to this analysis, SL-precoder complexity - based on the approximate matrix inversion-has been estimated. Both methods solve the problem of full or partial far-end crosstalk (FEXT) cancellation in VDSL downstream transmission. For this problem, the strategy avoiding the explicit matrix inversion was found to have the smallest number of multiplication/division operations. The analysis performed provides an opportunity for VDSL-designers to justifiably select a computationally attractive precoding strategy taking into account the necessity of adaptive power control for the input signals to the DSL-channel from the Central Station.

Vdsl-системы, vdsl-systems, far-end channel crosstalk, downlink data transmission, zero-forcing precoding, simplified linear precoding.

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