Crosstalk channel estimation method, device and system

Abstract

A crosstalk channel estimation method, a device and a system. The method includes the steps of a vector control entity (VCE) generating an orthogonal training guide frequency sequence matrix according to user's route; the VCE allocateing guide frequency sequence for each on-line user route i respectively according to the orthogonal training guide frequency sequence matrix,wherein the guide frequency sequence allocated after being modulated is sent out by a tramsmitting end Ti of each on-line user route i, and the guide frequency sequences of any two routes among the on-line user's routes are orthogonal, VCE receiving error samples sent by the receiving end Ri of each on-line user route i, wherein the error samples are obtained by the receiving end Ri according to the modulation signal of the guide frequency sequences; and the VCE calculating the crosstalk channel estimation parameters based on the error samples and the guide frequency sequence of the on-line user routes.

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. Far-end crosstalk (FEXT) such as figure 1 As shown, some lin...

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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 channel 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, seriously affecting the user experience

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