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A method and device for calibrating iq data based on constant envelope signal

A calibration method and constant envelope technology, applied in the field of digital communication, can solve the problems of unsatisfactory performance, increased chip cost, long calibration time, etc., and achieve the effect of improving data calibration reliability and fast calibration speed

Active Publication Date: 2019-09-06
ALLWINNER TECH CO LTD
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  • Application Information

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Problems solved by technology

The disadvantage of this method is that on the one hand, the cost of the chip is increased, and on the other hand, the image signal of the sine wave in the chip may be lower than the specification, which leads to the fact that the performance after calibration still cannot meet the requirements.
The disadvantage of this method is that the large amount of data collected results in long calibration times

Method used

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  • A method and device for calibrating iq data based on constant envelope signal
  • A method and device for calibrating iq data based on constant envelope signal
  • A method and device for calibrating iq data based on constant envelope signal

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Embodiment Construction

[0043] refer to figure 1 , figure 1 is the constellation diagram of IQ data in an ideal state. The digital signal transmission method generally adopts constant envelope modulation and then transmits through IQ two-way data. The ideal IQ two-way data can be expressed by the following formula 1:

[0044]

[0045] Wherein, x is the I channel data, y is the Q channel data, and a is a constant, which is related to the equipment system.

[0046] refer to figure 2 , figure 2 is a constellation diagram of IQ data in an IQ imbalance state. When there is an IQ imbalance (IQ-mismatch), the IQ two-way data can be expressed by the following formula 2:

[0047]

[0048] Among them, a, b, and c are all parameters,

[0049] The above formula 2 can be written as formula 3 after changing,

[0050]

[0051] And the IQ data after calibration (x c ,y c ) should satisfy formula 4,

[0052]

[0053] The above formula 3 and formula 4 are required to be constant, so formula 5 can...

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Abstract

The invention provides an IQ data calibration method based on a constant envelope signal and an IQ data calibration device based on the constant envelope signal. The IQ data calibration method is used for communication equipment, and comprises steps that direct current offset calibration is carried out to acquire a direct current estimation value; at least n pairs of original IQ data are received, and IQ compensation parameters (a,b,c) are calculated according to a target function; calibration is carried out according to the direct current estimation value and the IQ data compensation parameters, and the IQ data (xc,yc) is calibrated. The IQ data calibration device used for executing the IQ data calibration method is provided. By adopting the IQ calibration method and the IQ calibration device provided by the invention, the calibration is carried out by requiring less data, and calibration speed is fast, and by determining whether an IQ compensation parameter extraction failure is caused by strong interference conditions or strong noise conditions, the data calibration reliability of the IQ calibration method and the data calibration reliability of the IQ calibration device are improved.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to an IQ data calibration method and an IQ data calibration device based on a constant envelope signal. Background technique [0002] In the existing communication architecture, the intermediate frequency circuit basically has two IQ circuits. Due to the deviation between the two IQ circuits, this will cause many problems such as reduced image suppression and signal quality degradation. Especially in advanced manufacturing processes, IQ-mismatch becomes more obvious. . In existing calibration schemes, calibration parameters are generally extracted first, and then compensation or circuit calibration is performed according to the calibration parameters. There are mainly the following methods for calibration parameter extraction: [0003] 1. Factory calibration: After leaving the factory, the sine wave is sent to the input terminal of the receiver, and the receiver realizes param...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36
Inventor 朱嘉俊周一文
Owner ALLWINNER TECH CO LTD
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