Predistortion processing method and system based on parallel structure

Abstract

The invention discloses a predistortion processing method based on a parallel structure. The method includes the following steps: (1) inputting data into a system to obtain a universal predistortion coefficient; (2) when the input data is stable, enabling the system to obtain a predistortion coefficient, and turning off an adaptive predistorter branch switch; (3) when the input data is stable, enabling an adaptive predistorter to update the predistortion coefficient; when the input data is unstable, turning off the adaptive predistorter branch switch; and when the input data is a wide-band high-power signal, returning to the step (1); (4) when the input data is a narrow-band low-power signal, turning off the adaptive predistorter branch switch, and returning to the step (3); and (5) when the input data in the step (4) is a wide-band high-power signal, returning to the step (1). According to the scheme of the invention, the problems existing in a traditional predistortion method can besolved, more excellent predistortion performance can be realized, and the power amplifier output has better linearity.

Description

technical field [0001] The invention relates to the field of digital baseband signal processing, in particular to a pre-distortion processing method and system based on a parallel structure. Background technique [0002] The power amplifier plays an important role in the field of wireless communication, but its nonlinear distortion will expand the spectrum of the original input signal, and the expanded spectrum will interfere with adjacent band signals, and will also generate in-band distortion, increasing error code rate. [0003] Power amplifiers mostly use memory polynomial models, so nonlinear distortion can be reduced through linearization. Currently, the most promising linearization technique is digital predistortion technique; [0004] One disadvantage of pre-distortion technology is that the update calculation time of pre-distortion coefficients is relatively long, generally in seconds, while the power conversion of communication signals is very fast, usually in mi...

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Problems solved by technology

[0004] One disadvantage of pre-distortion technology is that the update calculation time of pre-distortion coefficients is relatively long, generally in seconds, while the power conversion of communication signals is very fast, usually in microseconds;

[0005] Usually, the predistortion coefficients calculated under wide frequency band and high power are universal, that is, there is a certain predistortion effect for signals of any narrowband and any power, but the effect is not the best; while the predistortion coefficients calculated for narrowband signals are not It is versatile. When the frequency and power of the signal change, the pre-distortion effect will seriously drop, and even cause the output power of the pre-distorter to increase abnormally, which may cause the power amplifier to burn out

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