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Performance Analysis of Cyclostationary Interference Suppression for Multiuser Wired Communication Systems  

Im, Gi-Hong (Communications Research Lab., Pohang University of Science and Technology (POSTECH))
Won, Hui-Chul (Communications Research Lab., Pohang University of Science and Technology (POSTECH))
Publication Information
Journal of Communications and Networks / v.6, no.2, 2004 , pp. 93-105 More about this Journal
Abstract
This paper discusses cyclostationary interference suppression for multiuser wired communication systems. Crosstalk interference from digital signals in multipair cables has been shown to be cyclostationary. Many crosstalk equalization or suppression techniques have been proposed which make implicit use of the cyclostationarity of the crosstalk interferer. In this paper, the convergence and steady-state behaviors of a fractionally spaced equalizer (FSE) in the presence of multiple cyclostationary crosstalk interference are thoroughly analyzed by using the equalizer's eigenstructure. The eigenvalues with multiple cyclostationary interference depend upon the folded signal and interferer power spectra, the cross power spectrum between the signal and the interferer, and tile cross power spectrum between the interferers, which results in significantly different initial convergence and steady-state behaviors as compared to the stationary noise case. The performance of the equalizer varies depending on the relative clock phase of the symbol clocks used by the signal and multiple interferers. Measued characteristics as well as analytical model of NEXT/FEXT channel are used to compute the optimum and worst relative clock phases among the signal and multiple interferers.
Keywords
Fractionally-spaced equalizer; interference suppres-sion and cancellation; multiple cyclostationary interference; xDSL ad high-speed LAN environments;
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