Method and device for reducing VDSL high-frequency crosstalk

Abstract

The invention relates to a method and a device for reducing VDSL high frequency crosstalk; the method mainly comprises the following steps: firstly, the electric length value of a VDSL (very high bit rate digital subscriber line) is determined; secondly, according to the electric length value, the frequency range of the signal transmitted through a corresponding line is determined; moreover, signal is transmitted through a corresponding line according to the determined frequency range. The invention is mainly used to switch off the transmission of high frequency signal and only transmits low frequency signal when the electric length value of a line exceeds a preset value, thereby reducing the crosstalk in the line. The implementation of the invention can effectively overcome the crosstalk on an adjacent line during the channel finding stage of the VDSL, thereby ensuring the transmission performance of the VDSL transmitting data; meanwhile, the implementation of the invention is based on the prior standard; therefore, the invention has the advantages of simplicity and easy implementation.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and device for reducing VDSL high-frequency crosstalk. Background technique [0002] XDSL technology is a transmission technology for transmitting high-speed data in telephone twisted pair, including VDSL (Very High Speed ​​Digital Subscriber Line) and VDSL2 (second generation VDSL) standards, and VDSL3 (third generation VDSL) in the future, MIMO VDSL (multiple input and output VDSL), VECTERVDSL (vector VDSL) and so on. [0003] The structure of the VDSL system is shown in Figure 1, which includes a communication station 1 located at the central office, called the central office communication station VTU-O, and a communication station 2 located at the far end, called the remote communication station VTU-R, two Sites communicate with each other over a single line. The signal sent from station 1 to station 2 is called downlink signal, and the opposite direc...

AI Technical Summary

Problems solved by technology

As shown in Figure 4, it can be seen that in the channel discovery stage of the long line, the crosstalk in the DS2 frequency band of the short line is extremely large, and the crosstalk power at some frequency points is even higher than the signal power of the short line, which will affect the transmission of the short line that is transmitting data. Large impact on performance, e.g. greatly increased bit errors, etc.

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