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Narrow-band feedback digital pre-distortion system and method

A digital pre-distortion and pre-distortion technology, which is applied in the direction of synchronization/start-stop system, improved amplifier to reduce non-linear distortion, components of amplifier devices, etc., can solve problems such as increasing the difficulty of system implementation and increasing system cost

Active Publication Date: 2017-03-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

According to the traditional feedback path design method, in order to accurately capture the output signal of the power amplifier, the feedback path bandwidth needs to be at least 500MHz, and the corresponding analog-to-digital conversion rate needs to be at least 1000MHz, which greatly increases the difficulty of system implementation and increases the system cost.

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  • Narrow-band feedback digital pre-distortion system and method
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Embodiment Construction

[0058] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0059] Such as figure 1 As shown, a digital predistortion system with narrowband feedback includes a digital predistorter, a digital-to-analog conversion module, a power amplifier, a filter, an analog-to-digital conversion module, and a predistortion parameter estimation module;

[0060] The input terminal of the digital predistorter is connected to the signal source, and the output terminal of the digital predistorter is connected with the digital-to-analog conversion module and the predistortion estimation module respectively; the output terminal of the digital-to-analog conversion module is connected with the power amplifier, and the output of the power amplifier The terminals are respectively connected with the signal output device and ...

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Abstract

The invention discloses a narrow-band feedback digital pre-distortion system and method. The narrow-band feedback digital pre-distortion system comprises a digital pre-distorter, a digital-analog conversion module, a power amplifier, a filter, an analog-digital conversion module and a pre-distortion parameter estimation module; the input end of the digital pre-distorter is connected with a signal source while the output end of the digital pre-distorter is respectively connected with the digital-analog conversion module and the pre-distortion parameter estimation module; the output end of the digital-analog conversion module is connected with the power amplifier, and the output end of the power amplifier is respectively connected with the signal output device and the filter; the output end of the filter is connected with the pre-distortion parameter estimation module through the analog-digital conversion module; the output end of the pre-distortion parameter estimation module is connected with the digital pre-distorter. By performing filtration processing on the signals output by the power amplifier, performing digital-analog conversion and pre-distortion parameter extraction after the signal bandwidth is reduced, and performing pre-distortion adjustment by the digital pre-distorter, the linearity index of the power amplifier is guaranteed on the basis that the feedback pass bandwidth is decreased and the analog-digital conversion rate, the system power and the cost are reduced.

Description

technical field [0001] The invention relates to a digital predistortion system and method for narrowband feedback. Background technique [0002] The power amplifier (Power Amplifier PA) is one of the core components in the modern mobile communication system, and its performance directly affects the performance of the wireless communication system. To improve efficiency, amplifiers usually operate in a high-efficiency region close to the saturation point, where nonlinear characteristics exist in the amplifier. Since the current communication signal has a non-constant envelope, intermodulation distortion and spectrum growth will occur after nonlinear amplification, which will cause adjacent channel interference and deteriorate the bit error rate of the receiver. In order to solve this problem, a digital pre-distortion (Digital Pre-Distortion DPD) technology has emerged. With the assistance of pre-distortion technology, the power amplifier can work near the saturation point a...

Claims

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Application Information

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IPC IPC(8): H04L25/49H03F1/32
CPCH03F1/3247H04L25/49
Inventor 全欣刘颖潘文生唐友喜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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