Method and system for realizing self-adaptive predistortion power amplifier linearization

Abstract

The invention relates to a method and a system for realizing the self-adaptive predistortion power amplifier linearization. The system comprises an OFDM base band signal module, a self-adaptive digital predistortion module, an DAC, a radio frequency transmitter, a PA, an antenna, a directional coupler, a radio frequency receiving machine and an ADC, wherein the self-adaptive digital predistortionmodule also comprises a mixing self-adaptive algorithm engine, the mixing self-adaptive algorithm engine is used for generating a correction factor of a digital predistortion device by using RLS and PSO self-adaptive algorithm according to expected signals and feedback signals of the ADC and sending the correction factor to the digital predistortion device, wherein the expected signals are base band signals output by the digital predistortion device. When the method and the system of the invention are adopted, the convergence speed can be accelerated, the convergence precision can be improved, and at the same time, the system cost can be lowered.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a hybrid method and system for realizing the linearization of fast adaptive digital predistortion power amplifier. Background technique [0002] With the development of communication technology, operators pay more and more attention to reducing CAPEX (construction cost) and OPEX (maintenance cost). Since the wideband radio frequency power amplifier (Power Amplifier, PA) is the most expensive nonlinear component with the largest power consumption in the base station, in the face of the large bandwidth of the radio frequency signal and the peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), broadband High linearity and high efficiency of radio frequency power amplifiers are urgent technical problems to be solved. [0003] In response to the above problems, the current common practice is to introduce adaptive digital pre-distortion technology (Digital Pr...

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Problems solved by technology

However, although the ADC10A used in this system is a narrow-band device, which reduces the cost, the narrow-band adaptive algorithm has a slow convergence speed, and cannot be applied in a wide-band environment, and cannot meet the requirements of digital pre-distortion under high-bandwidth conditions.

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