Calculating method of digital pre-distortion parameters and pre-distortion system

Abstract

The invention discloses a calculating method of digital pre-distortion parameters and a pre-distortion system and relates to the field of digital pre-distortion processing. The calculating method of digital pre-distortion parameters and the pre-distortion system are used for achieving a good signal processing effect and simplifying calculating complexity of models. The calculating method of digital pre-distortion parameters includes: acquiring pre-distortion signals already subjected to pre-distortion processing and first feedback signals already subjected to power amplifying processing after periodic processing starts; performing rated linear gain eliminating on the first feedback signals to obtain second feedback signals; determining pre-distortion parameters according to a matrix formed by the second feedback signals and a matrix formed by the pre-distortion signals; updating a pre-distortion parameter index table according to the determined pre-distortion parameters.

Description

technical field [0001] The invention relates to the field of digital pre-distortion processing, in particular to a method for obtaining digital pre-distortion parameters and a pre-distortion system. Background technique [0002] With the development of modern communication technology, more and more attention has been paid to various nonlinear characteristics of power amplifiers, and the behavior model has become a research hotspot in the field of microwave circuits. Compared with the traditional transistor-level circuit model, the behavior model greatly simplifies the analysis and calculation of the model, and maintains sufficient accuracy of nonlinear circuit analysis, making it especially suitable for performance analysis of broadband digital signal systems; therefore, in It has good application prospects in the research of large-scale integrated circuits and pre-distortion technology. For broadband communication systems, the traditional nonlinear model is no longer appli...

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Problems solved by technology

However, the two models cannot completely describe the nonlinear characteristics of the power amplifier, especially it is difficult to accurately represent the envelope memory effect of the power amplifier; in addition, the Wiener model and the Hammerstein model are not linear equations for the solution of model parameters , it is difficult to extract the parameters of the model

MP (memory polynomial) is another commonly used behavioral model, which can be regarded as an extended Hammerstein model, but sometimes the required model accuracy cannot be obtained

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