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Double-frequency power amplifier digital predistortion device and method based on piecewise linear function

A piecewise linear function and digital pre-distortion technology, which is applied to parts of amplification devices, power amplifiers, amplifiers, etc., can solve the problems of increasing the complexity of model operations and occupying large computing resources.

Active Publication Date: 2019-02-15
SOUTHEAST UNIV
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Problems solved by technology

However, when this model describes the intermodulation distortion, it introduces a high factorial term, which increases the computational complexity of the model, making the model take up a lot of computational resources when implemented on FPGA.

Method used

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  • Double-frequency power amplifier digital predistortion device and method based on piecewise linear function
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  • Double-frequency power amplifier digital predistortion device and method based on piecewise linear function

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Embodiment Construction

[0056] The technical solution of the present invention will be further introduced below in conjunction with specific embodiments.

[0057] The specific implementation of this patent discloses a dual-frequency power amplifier digital predistortion device based on a piecewise linear function, such as figure 1 Shown, including:

[0058] The first digital predistorter: The first digital predistorter contains a predistortion model based on a piecewise linear function, and the digital baseband input signal of the first frequency band x 1 (n) Input the first digital predistorter, and the first digital predistorter combines its own model parameters and the digital baseband input signal of the first frequency band x 1 (n) Input to its own predistortion model, and the predistortion model outputs the first predistortion output signal x 1-pre (n), the first predistortion output signal x 1-pre (n) Also used as the output signal of the first digital predistorter;

[0059] The second digital predis...

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Abstract

The invention discloses a double-frequency power amplifier digital predistortion device and method based on a piecewise linear function, which comprises a first digital pre-distorter, a second digitalpre-distorter, a first digital-to-analog converter, a second digital-to-analog converter, a first low-pass filter, a second low-pass filter, a first modulator, a second modulator, a first power divider, a power amplifier, an attenuation coupler, a second power divider, a first band-pass filter, a second band-pass filter, a first demodulator, a second demodulator, a third band-pass filter, a fourth band-pass filter, a first analog-to-digital converter, a second analog-to-digital converter and a predistortion training module. The invention also discloses a double-frequency power amplifier digital predistortion method based on the piecewise linear function. The device and the method in the invention reduce the number of parameters in the existing 2D-DPD double-frequency power amplifier predistortion model, thereby reducing the implementation difficulty and consumed computing resource of a model in the FPGA and accelerating the computing time of the optimal model parameter.

Description

Technical field [0001] The present invention relates to the field of digital predistortion of multi-band power amplifiers, in particular to a dual-frequency power amplifier digital predistortion device and method based on piecewise linear functions. Background technique [0002] In recent years, mobile communication technology has developed rapidly, and the fifth generation of mobile communication (5G) is coming soon. In the 5G era, a communication system that supports multiple standards and multiple frequency bands at the same time is one of the hot spots of research. The power amplifier is the most important part of the communication system, and the research on the power amplifier that supports dual-band or multi-band is one of the important topics in the field of communication technology. In 5G, power amplifiers also face power efficiency issues due to data transmission rate requirements of the order of Gbps. In order to improve the transmission efficiency of the power ampli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/24G06F17/11H03F1/00
CPCH03F1/00H03F3/24G06F17/11
Inventor 翟建锋吴硕
Owner SOUTHEAST UNIV
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