Channel Modeling and Physical Layer Optimization in Copper Line Networks by Rainer Strobel

Author:Rainer Strobel
Language: eng
Format: epub, pdf
ISBN: 9783319915609
Publisher: Springer International Publishing

3.6.2 Mutual Couplings Between G.fast and VDSL2

Due to the different duplexing schemes and the overlapping spectrum between 2.2 and , there is crosstalk between G.fast and VDSL2. As shown in Fig. 3.18, there are four different coupling paths.

Each of the four receiving points (VDSL2 Cabinet, VDSL2 CPE, G.fast DP, G.fast CPE) experiences noise from three sources. For the affected (victim) line v, it is caused by NEXT (near end crosstalk) and far-end crosstalk (FEXT) from the disturber line d and receiver noise .

Self-FEXT, the far-end crosstalk between lines of the same service is reduced by crosstalk cancelation. Therefore, G.fast victim lines are disturbed only by VDSL2 lines and the vice versa. The corresponding crosstalk transfer functions are downstream FEXT and upstream FEXT and DP-side NEXT and CPE-side NEXT for subcarrier k.

Fig. 3.18Crosstalk couplings between G.fast and VDSL2

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