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Digital pre-distortion system and method

A technology of digital pre-distortion and pre-distorter, which is applied in the direction of synchronization/start-stop system, etc., can solve the problems of high complexity of pre-distortion model, reduce system working time, and large amount of calculation of the system, so as to achieve wide application range and improve operation accuracy , the effect of high application flexibility

Inactive Publication Date: 2012-05-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] In the case of a single digital predistorter, in order to achieve the purpose of improving the linearization of the power amplifier, the predistortion system generally requires the memory depth of the predistortion model and the value of the amplification order to be large, which makes the complexity of the predistortion model high. The system has a large amount of calculation, which reduces the working time of the system

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  • Digital pre-distortion system and method

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Embodiment Construction

[0029] The present invention is a novel digital predistortion system device and implementation method, and the present invention will be further described in detail below through specific embodiments and accompanying drawings.

[0030] figure 1 It is a novel digital predistortion system device of the present invention, which specifically includes: a baseband signal processing module 100, a combined digital predistorter 101, a DAC102, an up-conversion link 103, a power amplifier 104, a gain attenuation module 105, and a down-conversion link 106 , local oscillator 107 , ADC 108 , digital predistortion training controller 109 .

[0031] figure 2 A detailed schematic diagram of the combined digital predistorter 101 is given. The combined digital predistorter 101 is composed of a digital predistorter 1201, a digital predistorter 2202, and a digital predistorter N203. It is characterized in that it includes at least two digital predistorters, and the N digital predistorters are c...

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Abstract

The invention discloses a digital pre-distortion system and a digital pre-distortion method and is used for performing digital pre-distortion by adopting a combined digital pre-distorter which is formed by connecting two or more digital pre-distorters in series. The digital pre-distortion system comprises the combined digital pre-distorter 101, a digital-to-analog converter (DAC) 102, an up-conversion link 103, a power amplifier 104, a gain reduction module 105, a down-conversion link 106, a local oscillator 107, an analog-to-digital converter (ADC) 108 and a digital pre-distortion training controller 109. The invention also discloses the digital pre-distortion method. When the method is adopted, the digital pre-distortion system can efficiently operate. The system and the method overcome the defect of lower fitting accuracy of a single digital pre-distorter and have the advantages of high stability, good pre-distortion improvement effect, wide application range and simplicity in implementation.

Description

technical field [0001] A digital predistortion system and method, the present invention designs a digital predistortion system, and specifically relates to a linear amplification method and device combining DPD and power amplifier. Background technique [0002] With the rapid development of wireless communication technology, Power Amplifier (PA: Power Amplifier) ​​has increasingly become an indispensable part of the communication system, and its inherent nonlinear characteristics have attracted increasing attention in related fields. When the input signal power is large, the power amplifier will enter the saturation region or even the cut-off region, resulting in serious nonlinear distortion. In order to ensure that the power amplifier works in the linear region, it is often necessary to control the power of the input signal of the power amplifier; in order to accommodate the peak-to-average ratio of the signal, to ensure that the power amplifier will not enter the saturatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49
Inventor 余萍唐友喜潘文生符初生
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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