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

A digital pre-distortion and pre-distortion technology, applied in digital transmission systems, amplitude adaptive pre-distortion, look-up table adaptive pre-distortion, etc., can solve the difficulty of model parameter extraction, can not fully describe the nonlinear characteristics of power amplifiers, cannot Get model accuracy and other issues

Active Publication Date: 2014-03-26
DATANG MOBILE COMM EQUIP CO LTD
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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 equa

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

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Embodiment Construction

[0044] Since the commonly used digital pre-distortion processing model in the prior art cannot balance signal processing performance and calculation complexity, the embodiment of the present invention provides a pre-distortion parameter calculation method and a pre-distortion system, which are used in While achieving a good signal processing effect, the computational complexity of the model is simplified.

[0045] First, the embodiment of the present invention provides a method for obtaining digital predistortion parameters, such as figure 1 As shown, the method includes:

[0046] S101. After the periodic filtering process starts, obtain a predistortion signal after predistortion processing and a first feedback signal after power amplifier processing, and the predistortion signal is obtained according to the following predistortion model:

[0047] z ( n ) ...

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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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Application Information

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IPC IPC(8): H04L25/49H04L25/03H03F1/32H03F3/24
CPCH03F1/3247H03F3/24H04L25/49H04L27/367H03F1/3241H03F1/3258H03F3/245H03F2200/198H03F2201/3209H03F2201/3224H03F2201/3227H03F2201/3233H04B1/04H04B1/0475H04B1/62H04B2001/0416H04B2001/0425H04L27/368
Inventor 熊军王新民段滔王静怡
Owner DATANG MOBILE COMM EQUIP CO LTD
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