A digital predistortion system

A technology of digital pre-distortion and pre-distortion processing, which is applied in transmission systems, electrical components, etc., can solve the problems of increasing hardware circuit overhead, deteriorating pre-distortion effects of digital pre-distortion systems, and increasing costs, so as to improve pre-distortion effects, Improve the effect of overcompensation and good predistortion effect

Active Publication Date: 2020-11-10
西安烽火电子科技有限责任公司
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Problems solved by technology

For the general digital predistortion system, the quantization error distortion introduced by the feedback link cannot be compensated by the predistortion algorithm, but will introduce unnecessary feedback link overcompensation when extracting the lookup table, thus making the digital predistortion The predistortion effect of the system becomes worse
[0004] In this regard, the existing solution is to introduce a linear circuit for the feedback link distortion alone, perform distortion estimation, and then compensate the output
Since this method needs to introduce a linear circuit, it will increase the hardware circuit overhead and increase the cost

Method used

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] figure 2 Shown is a composition diagram of a digital predistortion system provided by the embodiment of the present invention Figure 1 .

[0019] see figure 2 The digital pre-distortion system provided by the embodiment of the present invention includes a delay unit 101, a channel switch 102, a pre-distortion processing unit 103, a DAC 104, a PA 105, an ADC 106, an over-distortion compensation unit 107, an adaptive algorithm unit 108, a table An a...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses a digital predistortion system. The system includes a time delay unit, a channel switch, a predistortion processing unit, a DAC, a PA, an ADC, an over-distortion compensation unit, an adaptive algorithm unit, a table address generation unit, and a compensation parameter query unit. The time delay unit, DAC, PA, ADC, over-distortion compensation unit and adaptive algorithm unit form a training channel to train pre-distortion compensation parameters. The time delay unit, predistortion processing unit, table address generation unit, compensation parameter query unit, DAC and PA form a predistortion channel to perform predistortion processing on digital baseband input signals, and the pre-distorted signals are power-amplified and output after DA conversion. The digital predistortion system can improve the overcompensation of feedback link distortion of the digital predistortion system and improve the efficiency of a radio frequency power amplifier and the index of the digital predistortion system without increasing hardware circuit and cost.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a digital pre-distortion system, in particular to a digital pre-distortion system for improving feedback link distortion overcompensation, which is suitable for improving the index of the digital pre-distortion system. Background technique [0002] A power amplifier, referred to as a power amplifier, is an important component of a wireless communication system. According to the different modulation modes of the wireless communication system, the wireless communication system can be divided into a constant envelope modulation system and a non-constant envelope modulation system. Among them, the envelope obtained by the non-constant envelope modulation method is changing, and the envelope carries the signal to be transmitted. Therefore, the power amplifier used in this system must have a high degree of linearity to ensure that the signal is transmitted during...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B1/00
CPCH04B1/005H04B1/04H04B1/0475H04B2001/0408H04B2001/0425
Inventor 任继军刘琪周勇敢周子谞
Owner 西安烽火电子科技有限责任公司
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