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Time-domain adaptive equalizer with virtual center

An adaptive equalization and equalizer technology, which is applied in equalizers, shaping networks in transmitters/receivers, baseband system components, etc., can solve problems such as inability to resist multipath effects and inability to track main path signals

Inactive Publication Date: 2006-10-11
上海奇普科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, traditional equalizers cannot track the changing main path signal, nor can they counteract time-varying multipath effects

Method used

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  • Time-domain adaptive equalizer with virtual center
  • Time-domain adaptive equalizer with virtual center
  • Time-domain adaptive equalizer with virtual center

Examples

Experimental program
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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0031] Such as figure 1 or figure 2 As shown, for the transmission data stream, the time-domain adaptive equalizer with a virtual center provided by the present invention includes: a feedforward filter with a virtual center or a feedforward overlap filter with a virtual center, a feedback filter, and a signal superposition Converter, level judge, error signal generator and tap coefficient updater.

[0032] Among them, the interconnection relationship between the components is: the output of the feedforward filter or the feedforward overlap filter is connected to one input of the signal adder, the output of the feedback filter is connected to the other input of the signal adder, and the signal The output of the adder is connected to the input of the level judge, the output of the level judge is connected to the input of the feedback filter, the output of the sig...

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Abstract

The related time-domain adaptive equalizer with virtual center improves the capacity anti channel Doppler effect. Unlike to prior art, though also locating in TIR, this virtual center does not match to the main path signal with strongest amplitude while keeps initial parameters same as other taps in some range. This invention needs no switch between main and auxiliary paths, and can stabilize tap coefficient on dynamic channel.

Description

Technical field [0001] The invention relates to a time-domain adaptive equalizer, in particular to a time-domain adaptive equalizer with a virtual center. The ability of the time-domain equalizer to counter the channel Doppler effect is improved by setting the virtual center. Adapt to the improvements made by the equalizer. Background technique [0002] In the practical applications of many different digital information, such as sound, data, and video communications, the equalizer is a very important component. Equalizers are used as echo cancellers (compensators) of loudspeakers in full-duplex communications, video de-ghosting devices in digital television or digital cable transmission, and signal conditioners for wireless modems and wireless phones. [0003] In the signal transmission process, 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 error. In most single-carri...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/01
Inventor 归琳管云峰孙军张文军梁伟强
Owner 上海奇普科技有限公司
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