Digital predistorter design method and device based on power amplifier model cutting

Abstract

The invention discloses a digital predistorter design method and device based on power amplifier model cutting, and the method comprises the steps: transmitting an original input signal to a hardwarecommunication system, and obtaining an output signal of a radio frequency power amplifier through a hardware feedback channel; carrying out down-conversion operation and digital sampling on the outputsignal, and then carrying out frequency alignment on the output signal and the input signal; carrying out autocorrelation synchronization processing and normalization operation on the output signal and the input signal; establishing a power amplifier model between the input signal and the output signal by using the generalized memory polynomial model; cutting the power amplifier model by adoptinga blind sparse segmented weak orthogonal matching pursuit algorithm to obtain a simplified power amplifier model; and performing inversion operation on the simplified power amplifier module to obtainthe power amplifier digital predistorter. According to the method, the GMP model is cut through the blind sparse SWOMP algorithm, and the power amplifier sparse model with high sparse capability andaccuracy is constructed, so that the digital predistorter with low complexity and high accuracy is obtained.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a digital predistorter design method and device based on power amplifier model tailoring. Background technique [0002] A power amplifier (Power Amplifier, PA) is an indispensable device in a wireless communication system, and its performance directly affects the working quality of the entire wireless communication system. Since the core device of the power amplifier is a semiconductor transistor, which itself presents inherent nonlinearity, the linearization technology of the power amplifier is essential. Digital Predistortion (Digital PreDistortion, DPD) has become a research hotspot in current power amplifier linearization technology due to its advantages of simple implementation and convenient debugging. [0003] We are currently in the transition period from 4G to 5G, and the fifth generation of mobile communication is about to be put into commercial ...

AI Technical Summary

Problems solved by technology

The working frequency band of the fifth-generation mobile communication is 3.4-4.9GHz, which is much higher than the working frequency band of the existing network, which will reduce the coverage capability of traditional single stations. To solve this problem, it is necessary to achieve dense and miniaturized base stations

However, the existing digital predistortion methods have certain defects, and it is difficult to achieve better application results on the power amplifier digital predistortion device.

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