Base band adaptive digital predistortion power amplifier correcting method and system

A digital pre-distortion and correction method technology, applied in the direction of synchronization/start-stop system, etc., can solve the problem that the nonlinear system is not effective enough

Inactive Publication Date: 2009-07-15
CHENGDU KAITENG SIFANG DIGITAL RADIO & TELEVISION EQUIP CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide a baseband adaptive digital predistortion power amplifier calibration method, aiming to

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  • Base band adaptive digital predistortion power amplifier correcting method and system
  • Base band adaptive digital predistortion power amplifier correcting method and system
  • Base band adaptive digital predistortion power amplifier correcting method and system

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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] The baseband adaptive digital predistortion power amplifier correction method and system provided by the embodiment of the present invention adopts a power amplifier model based on the characteristics of the comprehensive memory polynomial and the Murray Hill model, uses NEWTON / LS to perform iterative training, and realizes the correction of the predistorter, which can By making full use of the robustness of the memory polynomial, compared with the existing memory polynomial predistortion technology, it can more effectively deal with nonlinear systems with complex memory structures.

[0053]...

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Abstract

The invention suitable for a field of linearization processing of transmitting terminals of digital televisions provides a baseband adapting digital pre-distortion power amplifier correcting method and a system thereof. The method comprises that, in a communication state, a residual difference between a communication signal after being pre-distorted and a signal re-introduced from a power amplifier, reduced by G times and pre-distorted, wherein the G is the power amplifier gain, is calculated in real time, when the value of the residual difference is bigger than the value of a preset threshold 1, the communication state is cut off, and the system enters a training state; in the training state, a residual difference between a signal obtained by pre-distorting a training sequence and eliminating the synchronous head and a signal re-introduced from a power amplifier, reduced by G times, pre-distorted, with the synchronous head eliminated is calculated in real time, the two coefficients used in pre-distortion processing are iterated and upgraded by an LS method and a Newton method until the value of the residual difference is converged, and when the residual difference is lower than the value of a preset threshold 2, the training state is ended and the communication state is recovered, wherein, the training sequence is gold codes having a synchronous head.

Description

technical field [0001] The invention belongs to the field of linearization processing of a digital TV transmitting end, and in particular relates to a baseband self-adaptive digital predistortion power amplifier correction method and system. Background technique [0002] A power amplifier is an indispensable part in a communication system, and there is inevitably nonlinearity between its input and output. Early wireless communication was based on the constant envelope modulation technology which is insensitive to the nonlinearity of power amplification, which can make the power amplifier work in the near saturation region with higher efficiency. However, the disadvantage of low bandwidth utilization of constant envelope modulation severely restricts the development of high-speed data transmission in wireless communication. In order to improve the system capacity and make full use of limited spectrum resources, various wireless communication systems must adopt modulation met...

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Application Information

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IPC IPC(8): H04L25/49
Inventor 马亮
Owner CHENGDU KAITENG SIFANG DIGITAL RADIO & TELEVISION EQUIP CO LTD
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