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Predistortion method based on memory non-linear system and predistortion apparatus thereof

A memory nonlinear, predistortion technology, applied in the field of signal processing

Active Publication Date: 2012-03-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a pre-distortion method and pre-distortion device based on the memory nonlinear system based on the idea of ​​piecewise linearization in order to keep the input-output relationship of the memory nonlinear system linear

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  • Predistortion method based on memory non-linear system and predistortion apparatus thereof

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Embodiment Construction

[0034] Such as figure 2As shown, the predistortion device includes a memory nonlinear module, a signal detection and analysis module, a predistortion module, and a test sequence generation module. The signal input end of the pre-distortion module is connected to the signal source, the signal output end of the pre-distortion module is connected to the input end of the memory nonlinear module, the output end of the test sequence generation module is respectively connected to the input end of the memory nonlinear module, and the signal detection and analysis module. The input end is connected, the other input end of the signal detection and analysis module is connected with the output end of the memory nonlinear module, and the output end of the signal detection and analysis module is connected with the parameter input end of the predistortion module;

[0035] The memory nonlinear module is an object that needs to be linearized, and there is both nonlinearity and memory between ...

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Abstract

In order to maintain linearity of an input output relation of a memory non-linear system, according to a piecewise linearization idea, the invention discloses a predistortion method based on the memory non-linear system and a predistortion apparatus thereof. In the invention, a memory depth of a memory non-linear module is determined firstly, which means that present output is related with previous input at which times is determined, according to the memory depth, a relation between input of each related time and present output is obtained, and influence of a memory characteristic on the present output is fully considered. In addition, a piecewise linearization mode is employed to describe a non-linear relation between each previous time and present time output, a core idea is that a non-linear area is divided into a plurality of segments, linearization processing is adopted in each segment, and only a segment step length is reasonably set, a broken line and a curve can reach a needed approximation degree.

Description

technical field [0001] The invention relates to signal processing, in particular to a linearization processing method for memory and nonlinear signals. Background technique [0002] In a communication system, the input signal and output signal of many modules often present a nonlinear characteristic, and this module is called a nonlinear system. In applications such as signal amplification, detection, and control, it is often desirable to eliminate nonlinear features. At present, a main method of linearization processing is pre-distortion technology. The main idea is to connect the pre-distortion device between the signal source and the nonlinear system. The pre-distortion device first predicts the output value according to the pre-acquired input-output relationship of the nonlinear system, and then predicts the input value in advance according to the linearization requirements. The signal is adjusted so that its output value reaches the linearization standard. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49
Inventor 胡明唐友喜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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