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A linearization method based on piecewise curve fitting

A curve fitting and linearization technology, applied in the field of identification, can solve the problems of self-equipment interference, dissipation, power amplifier affecting the quality of the transmitted signal at the transmitting end, etc., and achieve the effect of high linear correlation

Pending Publication Date: 2019-01-08
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, the nonlinear characteristics of the power amplifier will directly affect the quality of the transmitted signal at the transmitting end, which will not only distort the signal, but also cause the signal energy in the main channel to escape to the adjacent channel, and generate electromagnetic signals outside the expected frequency band, thereby affecting Interference caused by own equipment or other equipment

Method used

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  • A linearization method based on piecewise curve fitting
  • A linearization method based on piecewise curve fitting
  • A linearization method based on piecewise curve fitting

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Embodiment Construction

[0022] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] like figure 2 , the linearization method based on piecewise curve fitting provided in this embodiment includes the following steps:

[0024] Step 1) By testing the actual power amplifier, record the relationship between the input power and output power of the power amplifier.

[0025] Step 2) On the MATLAB platform, based on the recorded data of the power amplifier, a power amplifier model is established, and based on the power amplifier model, a pre-distortion simulation is performed through an indirect pre-distortion module.

[0026] Step 3) On the basis of the pre-distortion simulation, segment the characteristic curve, improve the accuracy of the pre-distorter by means of segment processing, and eliminate it by partially overlapping each segment according to the jump phenomenon that occurs , to get the fi...

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Abstract

The invention relates to a linearization method based on piecewise curve fitting, the method comprising the following steps: step 1) recording the relationship between the input power and the output power of the power amplifier through testing the actual power amplifier; step 2) on a MATLAB platform, establishing a power amplify model based on the recorded power amplify data, and carrying out predistortion simulation through an indirect predistortion module based on the power amplifier model; step 3) on that basis of the predistortion simulation, replacing the common LS algorithm with the LS adaptive algorithm optimize by the segmentation processing for further simulation. The beneficial effects are: there is a higher linear correlation between input and output than the general method of using series to achieve predistortion. Through adoption of the idealized straight line, the maximum error is reduced from 0.05 V to 0.01 V, and the precision grade is increased to 5 times of the original value.

Description

technical field [0001] The invention relates to the technical field of recognition, in particular to a linearization method based on segmented curve fitting. Background technique [0002] The power amplifier (PA) is a very important component in the current wireless communication system. It is generally located after the signal modulation module and before the transmitting antenna in the communication system. It is used to amplify the modulated signal at the input end so that the RF antenna can effectively transmit the signal. However, the nonlinear characteristics of the power amplifier will directly affect the quality of the transmitted signal at the transmitting end, which will not only distort the signal, but also cause the signal energy in the main channel to escape to the adjacent channel, and generate electromagnetic signals outside the expected frequency band, thereby affecting Interference with own equipment or other equipment. Therefore, how to make the power ampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/36G06F30/367
Inventor 万发雨缪翔
Owner NANJING UNIV OF INFORMATION SCI & TECH
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