Crosstalk channel estimation method, device and system

Abstract

A method, an apparatus, and a system for estimating a crosstalk channel of a subscriber line. The method comprises: a vectoring control entity (VCE) generating an orthogonal training pilot sequence matrix according to the scale of subscriber lines; the VCE allocates a pilot sequence to each online subscriber line i according to the orthogonal training pilot sequence matrix respectively, the allocated pilot sequence being sent by a sending end Ti on each online subscriber line i after being modulated, pilot sequences of any two lines among the online subscriber lines being orthogonal to each other; the VCE receiving an error sample sent by a receiving end Ri of each online subscriber line i, the error sample being acquired by the receiving end Ri according to a modulated signal of the received pilot sequence; and the VCE calculating a crosstalk channel estimation parameter according to all the received error samples and the pilot sequence of the online subscriber line.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a crosstalk channel estimation method, device and system. Background technique [0002] xDSL (DSL, Digital Subscriber Line, Digital Subscriber Line) is a high-speed data transmission technology transmitted on a telephone twisted pair (unshielded twisted pair, Unshielded Twist Pair, UTP). The system that provides multiple xDSL access is called DSL Access multiplexer (DSLAM). Due to the principle of electromagnetic induction, the multiple signals connected to the DSLAM will interfere with each other, which is called crosstalk, such as near-end crosstalk (NEXT) and far-end crosstalk (FEXT). The performance will not cause too much harm, and because the frequency band used by xDSL is getting wider and wider, far-end crosstalk (FEXT) will increasingly seriously affect the transmission performance of the line. figure 1 As shown, some lines will have low speed, unstable ...

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Problems solved by technology

[0004] In the prior art, when using the above method for crosstalk channel estimation, for a system with a scale of 100 lines, a pilot sequence with a length of 128 is required, and it takes about 8.224 seconds without losing error samples. Although the scale of the pilot sequence is It can be used to estimate the crosstalk channels between all lines in the system, but according to the actual situation of the current network, the online rate of users in the system will not reach 100%, that is to say, it is difficult to estimate all crosstalk channels in the system In some cases, this will lead to the following result: no matter whether the system has 1 line in the showtime state or 99 lines in the showtime state, when a new user line is activated, the crosstalk channel estimation will be performed according to the full-length pilot sequence, That is, the initialization is performed according to the maximum time, which makes the user line online time very long, which seriously affects the user experience

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