Method for channel interference evaluation of communication system

Abstract

The present invention provides a method for estimating the channel crosstalk of the communication system, which comprises the following steps: A ensuring the channel impulse response or crosstalk channel impulse response of each circuit which has past the time domain equalizer TEQ respectively approach the channel target impulse response or crosstalk channel target impulse response; and B setting the channel target impulse response or crosstalk channel impulse response as the equal impulse response of the channel or the equal impulse response of the crosstalk channel. The invention solves the target impulse response when the TEQ tap coefficient is calculated, as the target impulse response is the approaching of the equalized channel impulse response, the calculated target impulse response is directly used as the estimation of the channel impulse responding, and the calculated target impulse response is the estimation of the channel transferring function and the crosstalk function when the calculated target impulse response is converted to time domain, and no other method is needed to measure the transferring function and crosstalk function of the channel, the considerable operating amount is avoided and the difficulty of the realization is reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for estimating channel crosstalk in a communication system. Background technique [0002] xDSL is a high-speed data transmission technology transmitted over telephone twisted pair (unshielded twisted pair, Unshielded Twist Pair, UTP). Technology enables xDSL and traditional telephone service (POTS) to coexist on the same pair of twisted pairs, where xDSL occupies the high-frequency band, POTS occupies the baseband part below 4KHz, and the POTS signal and xDSL signal are separated by a splitter. xDSL for passband transmission uses discrete multitone modulation (DMT). A system that provides multiple xDSL access is called a DSL access multiplexer (DSLAM). The reference model of the DSLAM is shown by the dotted line in Figure 1 . [0003] Telephone twisted pair is used as a transmission channel, and its distortion-free channel capacity must satisfy Shannon’s channel capacity form...

AI Technical Summary

Problems solved by technology

However, the implementation of these technologies is relatively complex and the amount of calculation is relatively large.

Can not provide quantitative test of crosstalk between multiple lines, only optimize the performance of DSL lines or systems from certain statistical characteristics of crosstalk, the degree of optimization is limited

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