Variable length equalizer and method for providing optimal value of feedforward and feedback length

An equalizer and variable technology, applied in the field of communication systems, can solve the problems of noise amplification and high cost

Inactive Publication Date: 2009-05-13
ALICORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the longer the length, the higher the cost, and also the problem of noise amplification

Method used

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  • Variable length equalizer and method for providing optimal value of feedforward and feedback length
  • Variable length equalizer and method for providing optimal value of feedforward and feedback length

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Embodiment 1

[0033] Please refer to FIG. 1 , which is an embodiment 1 of the present invention, which is a schematic block diagram of a variable-length equalizer disclosed in the present invention. The variable length equalizer 100 includes a first tap set 110 , a second tap set 120 and a third tap set 130 . In addition, assuming that the variable length equalizer 100 is a decision feedback equalizer in this embodiment, it further includes a first selection switching unit 140, an adder 150, a decision unit 160, an adaptive The coefficient updating unit 170 and a second selection switching unit 180 . Wherein the first selection switching unit 140 is a many-to-one multiplexer or a similar component, which is connected to the above-mentioned plurality of tap groups 110, 120, 130, for receiving the first and second tap groups 110, 120 The provided signal value is selected to provide the signal value of the first tap group 110 or the second tap group 120 to the third tap group 130 according to...

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Abstract

A equalizer of variable length comprises: multiple tap group, for storing signal value inputted at every time point and corresponding coefficient value; a self-adaptive coefficient update unit, connecting with the tap group for updating coefficient value of the tap group according to signal value provided by the tap group and a error signal; and a selection switching unit, connecting with the tap group and feeding the a feedforward signal value and feedback signal value in corresponding tap group for updating the signal value of the tap group so as to change feedforward length and feedback length.

Description

technical field [0001] The present invention relates to a communication system, in particular to a variable-length equalizer and methods for updating signal values ​​and setting optimum values ​​of feed-forward and feedback lengths. Background technique [0002] Generally speaking, some signal processing technologies are added to the communication system so that the signal transmission quality can be maintained at a certain level in a poor environment. Multi-path fading is one of the main factors affecting the quality of the transmission channel, so users usually use techniques such as equalization design to improve the quality of data transmission. [0003] The equalization technique is mainly used to compensate the inter-symbol interference (ISI) caused by multi-path reflection through the transmission channel, so that the received signal can recover the expected magnitude and average range of the phase. It is also one of the main parts of chip cost. The performance of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 陈岳勇
Owner ALICORP
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