Time domain self-adaptive equalizer and decision feedback filter included therein

An adaptive equalization and decision feedback technology, which is applied to color TV components, TV system components, TVs, etc., can solve the problems of low hardware resource overhead, tense timing relationship, and large hardware resource overhead in non-transposed structures.

Active Publication Date: 2008-01-02
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this way, compared with the non-transposed structure, the consumption of hardware resources of the transposed structure will increase
If there are many stages of the feedback filter, in order to save hardware resources, it is necessary to limit the number of bits of the input signal, which not only limits the realization of blind equalization, but also is a major obstacle to the realization of multi-constellation point modulation.
[0007] To sum up, the hardware resource overhead of the non-transpo

Method used

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  • Time domain self-adaptive equalizer and decision feedback filter included therein
  • Time domain self-adaptive equalizer and decision feedback filter included therein
  • Time domain self-adaptive equalizer and decision feedback filter included therein

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Embodiment Construction

[0020] The following embodiments are provided in combination with the contents of the present invention, which are applied in a digital TV terrestrial broadcasting system.

[0021] FIG. 4 is a simplified structural block diagram of a time-domain adaptive equalizer 200 based on delay matching. In one embodiment of the present invention, the time-domain adaptive equalizer 200 based on delay matching includes: a forward filter 10, a first feedback filter 21, a second feedback filter 22, a decision device 40, and an error generator 50. A tap coefficient updater 60 and an adder 30. The interconnection relationship between its various components is: the input signal enters the forward filter 10 first, and the output sum1 of the forward filter 10 is connected to an adder 30 . The other two inputs sum2 and sum3 of the adder 30 are outputs of the first feedback filter 21 and the second feedback filter 22 respectively. The adder 30 adds the input signals sum1 , sum2 and sum3 , and out...

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Abstract

The invention relates to a time domain self-adaptive balancer, wherein input signal flows to a forward filter which output flows into an input of an adder, another two inputs of the adder is the output of a first feedback filter and the output of a second feedback filter, the adder adds the input signals, which output is connected with the input of a judger, an error generator according to the input and output of the judger generates an error signal, a tapping factor refresher according to the error signal generates a tapping factor to refresh the tapping factor of the forward filter and the judgment feedback filter. The first feedback filter uses a rotary structure, and the second feedback filter uses a non-rotary structure, which input has some time delay relative to the input of the first feedback filter. The stage numbers of the rotary structure and non-rotary structure are decided according to the length of last path.

Description

technical field [0001] The invention relates to a time-domain adaptive equalizer, in particular to a time-domain adaptive equalizer based on delay matching. Background technique [0002] The equalizer is a very important component in the practical application of many different digital information such as voice, data and video communication. Equalizers are used as echo cancellers (compensators) for loudspeakers in full-duplex communications, video deghosting in digital television or digital cable transmission, signal conditioners for wireless modems and wireless phones, etc. In the process of signal transmission, due to the existence of multipath signals in the channel, it will bring inter-symbol interference (ISI), and inter-symbol interference is an important cause of errors. In most single-carrier digital applications, the time Domain Adaptive Equalizer to correct ISI errors. [0003] FIG. 1 is a simplified block diagram of a conventional time-domain adaptive equalizer 1...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N5/21H04N21/472
Inventor 居峰何大治张文军管云峰吴松炎归琳
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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