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Method and apparatus for implementing training phase of adaptive channel equalization on digital communications path

A digital communication path and adaptive channel technology, applied in the field of training phase, can solve the problem of feedback equalizer giving enough good, failure, etc.

Inactive Publication Date: 2005-05-11
泰勒比斯股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, blind training fails if the channel transfer function has such spectral nulls that a linear equalizer (FFE) alone cannot give a good enough symbol error rate for the adaptation of a decision feedback equalizer (DFE)

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  • Method and apparatus for implementing training phase of adaptive channel equalization on digital communications path
  • Method and apparatus for implementing training phase of adaptive channel equalization on digital communications path
  • Method and apparatus for implementing training phase of adaptive channel equalization on digital communications path

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Embodiment Construction

[0042] The present invention relates to methods and apparatus suitable for the training of an adaptive equalizer for channel distortions when the channel contains band-stop filters which produce one or more stop-bands in the transmission spectrum of a data signal . The theoretical basis of the method can be clearly understood by the reader from the following discussion.

[0043] refer to Figure 5 , the figure shows two possible symbol groups (A and B) on the complex plane suitable for QAM or CAP modulation schemes, and draws the eye region (L) diagrammatically, due to the The inter-symbol interference caused by the stopband, the output state of the linear equalizer falls into this eye region (L). Symbol group A represents the 4-QAM scheme (or, on the other hand, the 4-CAP scheme), and symbol group B represents the 16-QAM scheme (or, on the other hand, the 16-CAP scheme). The intersymbol distance between adjacent points of a symbol group is denoted by the letter d.

[0044...

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Abstract

The invention relates to implementing a training phase of adaptive channel equalization on a digital communications path using QAM- or CAP-modulation method and comprising at least one band-stop filter that forms a stop band on a the signal spectrum. Training of adaptive equalizers is performed utilizing a sparse symbol constellation, wherein a number of symbol states (S) is smaller than that of a symbol constellation used in a normal data transmission state. The benefit of the sparse symbol constellation is that a strong intersymbol interference caused by the stop band can thus be reduced to such a low level in regard to a signal power that a linear equalizer may be used to reach a situation, wherein a proportion of correct symbol decisions becomes sufficiently high for training of a decision-feedback equalizer.

Description

technical field [0001] The invention relates to a method for a training phase of adaptive channel equalization on a digital communication path, wherein said data transmission channel has a stopband (or several stopbands) on the signal spectrum. [0002] The invention also relates to a device suitable for the training phase of adaptive channel equalization on a digital communication path, the data transmission channel of which has a stopband (or several stopbands) on the signal spectrum, the invention also relates to the use according to the above method transmitters and receivers. Background technique [0003] In the text describing the prior art and the features of the present invention, the following abbreviations are used: [0004] CAP without carrier amplitude and phase modulation [0005] DFE Decision Feedback Equalizer [0006] FFE feed-forward equalizer [0007] LMS least mean square [0008] PAM Pulse Amplitude Modulation [0009] QAM quadrature amplitude modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/01H04B3/06H04B7/005H04L25/03
CPCH04L25/03146H04L2025/0342H04L2025/0349H04L2025/03783
Inventor J·韦内宁
Owner 泰勒比斯股份公司