Digital linear pre-distortion method and system

Abstract

The invention applies to the field of communication, and provides a method and a system for digital linear predistortion. The method comprises the following steps: acquiring input / output signals of a base band of a power amplifier; performing digital linear predistortion training on the output signals and calculating the coefficient of digital linear predistortion; performing predistortion filtration according to the coefficient of digital linear predistortion; and judging whether the output signals of the power amplifier meet linearization requirements and ending the digital linear predistortion training if so. The system comprises a predistortion filter and a predistortion trainer. The invention has the advantages of improving the linearity of the power amplifier well, greatly reducing the occupation rate of space resources, reducing the utilization rate of logical resources, simplifying calculation complexity, providing convenience for hardware implementation and improving the efficiency of digital linear predistortion.

Description

technical field [0001] The invention belongs to the communication field, in particular to a digital linear predistortion method and system. Background technique [0002] The power amplifier (Power Amplifier, PA) is a nonlinear device widely used in communication systems. As long as the amplitude of the input signal exceeds its linear region, the output will generate nonlinear distortion, which will cause signal in-band distortion and adjacent-band signal interference. , so the distortion of the power amplifier must be controlled within a certain range. From the perspective of efficiency, nonlinear distortion cannot be eliminated only by increasing the linear region of the power amplifier, so linearization technology emerges as the times require. For the current mainstream standard WCDMA system of the third-generation mobile communication, its radio frequency signal is multi-level and has a high peak-to-average-power ratio (PAPR), which puts forward a new challenge for the l...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a digital linear predistortion method, which aims to solve the problem that radio frequency nonlinear active devices must be used when realizing linear predistortion in the prior art, and the control process is complicated.

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