ENVIRONMENTAL INFLUENCES ON THE POWER SPECTRAL DENSITIES OF VDSL SIGNALS

Rastislav Róka

   For successful analyzing of the VDSL transmission on metallic homogeneous symmetric lines, it is necessary to know basic features of the VDSL environment. This article introduces characteristics of the VDSL environment and shortly discusses duplex methods and proposed modulation techniques. In addition, particular service types of VDSL transmission rates and spectral characteristics of the VDSL signals together with demands on VDSL frequency spectrum allocations are presented. The main part of the article is focused on modeling of the VDSL environment and on analyzing of environmental influences on the power spectral densities of VDSL signals, especially in the access network in Slovakia. The results of this our modeling are used in a following detailed analysis of the VDSL system performance.

Keywords: the VDSL environment, VDSL transmission rates, the VDSL frequency spectrum, the power spectral density of the VDSL signal

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