Self-adaptive digital pre-distortion method and system based on look-up table method

A digital pre-distortion and self-adaptive technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, components of amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., to achieve fast calculation speed, good linear output, and difficult implementation and complexity simple effects

Pending Publication Date: 2016-12-07
CHIZHOU RICHSEMI ELECTRONICS
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Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the present invention proposes an adaptive digital predistortion method and system based on the look-up table method, which makes the linearization effect of the power amplifier more ideal, and the realization process is simple

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  • Self-adaptive digital pre-distortion method and system based on look-up table method
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  • Self-adaptive digital pre-distortion method and system based on look-up table method

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Embodiment Construction

[0019] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0020] Such as figure 1 Shown, a kind of system that realizes the adaptive digital pre-distortion method based on the look-up table method includes a baseband signal module, a digital pre-distortion module, an up-conversion channel, a power amplifier, a coupler, an attenuator and a down-conversion channel, and the baseband The signal module, the digital pre-distortion module, the up-conversion channel, and the power amplifier ...

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Abstract

The invention relates to a self-adaptive digital pre-distortion method and system based on a look-up table method, and belongs to the technical field of digital pre-distortion. The self-adaptive digital pre-distortion system comprises a baseband signal module, a digital pre-distortion module, an upper frequency conversion channel, a power amplifier, a coupler, an attenuator and a lower frequency conversion channel, wherein the digital pre-distortion module consists of a self-adaptive algorithm engine, a look-up table module and a pre-distorter; the look-up table module controls an input signal u (n) of the baseband signal module to pass through the pre-distorter to obtain a pretreatment signal x (n); the pretreatment signal x (n) pass through the upper frequency conversion channel to obtain an output signal Vd (t); after the output signal Vd (t) is amplified by the power amplifier, an antenna transmits a signal Vo (t); the signal Vo (t) is subjected to coupling attenuation; a feedback signal y (n) is obtained by the lower frequency conversion channel; the self-adaptive algorithm is adopted to modify a pre-distortion compensating signal to realize linearization of the power amplifier adopting the digital pre-distortion technology. The self-adaptive digital pre-distortion method and system enable the linearization effect of the power amplifier to be more ideal and the implantation process is simple.

Description

technical field [0001] The invention relates to the technical field of digital pre-distortion, in particular to an adaptive digital pre-distortion method and system based on a look-up table method. Background technique [0002] In a wireless communication system, due to the nonlinear distortion of the power amplifier itself, the out-of-band spectrum of the signal is spread and the in-band signal is distorted, causing adjacent channel interference and limiting the power amplifier efficiency and spectrum utilization. A predistorter is added to the front end of the power amplifier, and its characteristics are reciprocal to the nonlinear characteristics of the power amplifier, so as to compensate the nonlinear signal distortion and achieve the purpose of linear amplification. This linear optimization technology is called predistortion technology. [0003] There are polynomial method and iterative algorithm in existing technologies for realizing digital predistortion. Polynomial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/195H03F3/213
CPCH03F1/3258H03F3/195H03F3/213
Inventor 刘轶
Owner CHIZHOU RICHSEMI ELECTRONICS
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