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Ghost cancellation equalizer

A technology of ghost elimination and equalizer, applied in TV, color TV parts, electrical components, etc., can solve the ability of ghost removal and the power consumption limitation of the system, cannot properly handle static and dynamic channel changes, There are no problems such as channel state information, etc., to achieve the effect of improving the effect of de-ghosting

Inactive Publication Date: 2008-11-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such conventional ghost canceling equalizers can equalize the input signal, but have no information about the state of the channel, therefore, cannot properly handle changes in the state of the static and dynamic channel
As a result, deghosting capability and system power consumption are limited

Method used

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Examples

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Embodiment Construction

[0019] The structure of the present invention is as figure 2 As shown, the present invention includes a deghosting filter 210 , an error generator 250 , a channel estimator 220 , a state generator 230 and a coefficient updater 240 , and can be connected to a trellis decoder 280 .

[0020] The de-ghosting filter 210 may be a forward filter, a feedback filter, or a combination of the two. image 3 It is a block diagram of the ghost elimination equalizer based on the LMS algorithm conceived by the present invention, and its deghosting filter includes a forward filter and a feedback filter.

[0021] A deghosting equalizer can be implemented as one chip. It is also possible that the deghosting filter 210, the error generator 250 and the coefficient updater 240 may be implemented as one chip. The channel estimator 220 and the state generator 230 may be provided separately.

[0022] The deghosting filter 210 may include a forward filter and a feedback filter. The deghosting filt...

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PUM

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Abstract

The invention discloses a ghost cancellation equalizer, comprising a ghost filter which is used for canceling ghost and noise from a digital code element signal; an error generator which is used for generating the error output by the ghost filter; a channel estimator which is used for estimating and outputting channel pulse response of the digital code element signal which is input into the ghost filter; a state generator which is used for determining and outputting the reliability of the output of the ghost filter; a coefficient updater which is used for receiving the error, determining a tap with a step size that needs to be changed based on the channel pulse response and changing a determined step size of the tap to update the tap coefficient of the ghost filter based on the reliability. The ghost cancellation equalizer can adjust the tap coefficient of the ghost filter according to the channel state information in time, thus improving the ghost cancellation effect greatly.

Description

technical field [0001] The invention relates to a ghost eliminating device, in particular to a ghost eliminating equalizer used in a digital television terrestrial broadcasting system. Background technique [0002] There are usually different transmission paths (multipath transmission) in the transmission of digital television signals, so when a receiver receives the signals, a ghost image will be generated in the receiver. The basic idea of ​​ghost cancellation is to estimate the characteristic parameters of the multipath path, generate a simulated multipath path, obtain a simulated multipath signal, and subtract the signal from the received signal to realize ghost cancellation. [0003] The structure of the ghost cancellation equalizer commonly used in existing receivers is as follows: figure 1 As shown, the ghost cancellation equalizer includes a feedforward filter 110 , a feedback filter 120 , a first operation unit 130 , a second operation unit 140 and a decision unit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N21/41
Inventor 何怡刚黄姣英张松华
Owner HUNAN UNIV