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A Blind Correction Method for Mismatch Errors in a Dual-Channel TIADC System

A correction method, a technology for mismatch error, applied in the field of communication

Active Publication Date: 2020-07-03
NORTH CHINA INST OF AEROSPACE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some mismatch error estimation and correction methods need to add additional hardware to complete the correction of the mismatch error parameters

Method used

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  • A Blind Correction Method for Mismatch Errors in a Dual-Channel TIADC System
  • A Blind Correction Method for Mismatch Errors in a Dual-Channel TIADC System
  • A Blind Correction Method for Mismatch Errors in a Dual-Channel TIADC System

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Experimental program
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Embodiment 1

[0036] A method for blindly correcting mismatch errors in a dual-channel TIADC system, comprising the following steps:

[0037] Step 1: Obtain the sampling data X of channel 0 and channel 1 respectively 0 (k) and X 1 (k), and find the mean and mean square value E[X of the sampling data of channel 0 and channel 1 0 (k)], E[X 1 (k)], Sample data X of channel 0 and channel 1 0 (k) and X 1 (k) is expressed as:

[0038]

[0039] Among them, Δt 1 is the mismatch time of the system, |Δt 1 |≤0.1;g 1 is the gain error of channel 1, o 1 is the bias error of channel 1; Step 2: Estimate the gain error g of channel 1 1 and bias error o 1 , calculated as:

[0040]

[0041] Step 2: Use channel 1 gain error g 1 and bias error o 1 Calibrate the sampling data of channel 1 and obtain the first calibration data of channel 1

[0042]

[0043] Step 3: Calculate channel 0 sampling data X 0 (k) and the first calibration data of channel 1 cross-correlation function

[...

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Abstract

The invention discloses a blind correction method for mismatch errors of a dual-channel TIADC system. The method comprises the steps of acquiring sampled data of each channel, correcting the data of channel 1, computing a cross-correlation function between the sampled data of the channel 0 and the first corrected data of the channel 1, computing the cross-correlation function between the sampled data of the channel 0 and data output by each fractional delay filter, building a function relation, estimating mismatch time, and filtering mismatch time. According to the method provided by the invention, the three mismatch errors of the system do not need to be estimated in a closed loop manner, additional hardware is not needed to correct the error parameters, and an additional correction signal is not needed either.

Description

technical field [0001] The invention relates to a blind correction method for a mismatch error of a TIADC system, in particular to a blind correction method for a mismatch error of a dual-channel TIADC system, which belongs to the technical field of communication. Background technique [0002] TIADC (parallel sampling system) will produce offset error, gain error, and time phase error due to the non-ideal characteristics of the device. The correction techniques for the three main errors in TIADC (parallel sampling system) focus on two major directions, that is, non-blind estimation and correction algorithm and blind estimation and correction algorithm of mismatch error. The non-blind estimation and correction algorithm of the mismatch error needs to periodically inject excitation signals into the acquisition system to obtain the error parameters of the system. The non-blind estimation and correction algorithm will affect the real-time performance of the acquisition system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 白旭胡辉李万军张兴强
Owner NORTH CHINA INST OF AEROSPACE ENG