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A channel estimation system and method based on error update

A channel estimation and error technology, applied in baseband system components, multi-frequency code systems, shaping networks in transmitters/receivers, etc., can solve problems such as poor noise tolerance, and achieve small channel estimation errors and accurate estimation. Effect

Active Publication Date: 2016-08-31
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the following technical problems: the existing channel estimation technology has poor tolerance to noise, because the noise introduced in each estimation directly becomes a part of channel estimation

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  • A channel estimation system and method based on error update
  • A channel estimation system and method based on error update
  • A channel estimation system and method based on error update

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the examples in the accompanying drawings.

[0061] The principle of the present invention is realized by minimizing the error of each channel estimation. The specific measure is to estimate the error caused by each channel estimation deviation, and use the function of the error to update the channel response. The implementation method is similar to a phase-locked loop, and the key part is to extract the relevant error of each channel estimation and update the channel response.

[0062] like Figure 1-6 As shown, the steps of the specific implementation mode 1 are as follows:

[0063] First assume that the system has obtained some initial channel response estimate h of the system in some way 0 , through FFT transformation, the initial estimate of its frequency domain channel response can be obtained:

[0064] H ~ 0 = ...

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Abstract

The invention discloses an error-updating-based system and method for channel estimation. The method includes: converting received time domain signals into frequency domain signals, and using estimated frequency domain channel response to balance the frequency domain signals so as to obtain balanced data; deciding the balanced data to obtain a decision value, if the balanced date is constructed by known data through channels, the decision value is the known data; obtaining an estimation error between the estimated response and actual channel response according to the frequency domain signals, the estimated channel response and the decision value; subjecting the estimation error to loop filter and loop accumulation, and then outputting the same as the channel response for the next balancing. Due to the fact that channel estimation is performed by loop error updating, channel estimation results have larger redundancy to noise, the channel response can be estimated accurately, or small channel estimation errors can be achieved.

Description

technical field [0001] The invention relates to the design of an equalizer in a terminal in wireless or wired communication, especially the channel estimation system therein. Background technique [0002] In recent years, in modern wireless communication systems, in order to cope with the impact of some complex multipath channels on data and to simplify the design of receiver chips, the signal model that people usually use is often the multi-carrier-OFDM model, because in this way, A complex time-domain equalizer can be implemented with a single-tap frequency-domain equalizer, which greatly simplifies the design of the receiver. [0003] In this case, accurate estimation of the channel becomes very important, which directly determines the equalization performance of each carrier. [0004] However, the existing channel estimation techniques in the frequency domain mostly focus on one-time estimation, that is, FFT transformation is performed on the received data; the equalize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 王猛马宏伟黄戈戴永清俞丽娜郭焕丽梁伟强
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND