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Power amplifier digital pre-distortion device and method based on modified piecewise linear function

A piecewise linear function and digital pre-distortion technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, components of amplifiers, amplifiers, etc., can solve the problems of complex multi-layer structures of neural network models that are difficult to implement

Active Publication Date: 2016-06-08
SOUTHEAST UNIV
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Problems solved by technology

The multi-layer structure of the neural network model is generally too complex to be realized in digital signal processing

Method used

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  • Power amplifier digital pre-distortion device and method based on modified piecewise linear function
  • Power amplifier digital pre-distortion device and method based on modified piecewise linear function
  • Power amplifier digital pre-distortion device and method based on modified piecewise linear function

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0044] A power amplifier digital predistortion device based on a modified piecewise linear function, such as figure 1 As shown, including a digital predistorter based on a predistortion model of a modified piecewise linear function, a digital-to-analog converter, a wideband quadrature modulator, a power amplifier, an attenuating coupler, a wideband quadrature demodulator, an analog-to-digital converter, and Predistortion model training module, in which:

[0045] The...

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Abstract

The invention discloses a power amplifier digital pre-distortion device and method based on a modified piecewise linear function. The device comprises a digital pre-distorter of a pre-distortion model based on the modified piecewise linear function and a pre-distortion model training module. The digital pre-distorter carries out digital pre-distortion processing to input digital baseband signals; a power amplifier outputs analog baseband signals; after power coupling, orthogonal demodulation and analog-digital conversion are carried out to the analog baseband signals respectively by an attenuation coupler, a broadband orthogonal demodulator and an analog-digital converter, output digital baseband signals are generated; after input digital baseband signals and the output digital baseband signals are synchronized, the signals are input in the pre-distortion model training module; after the pre-distortion model training module carries out parameter training to the signals by using a least squares algorithm, power amplifier model parameters based on the modified piecewise linear function are obtained and are sent to the digital pre-distorter. According to the device and the method provided by the invention, the high order operation in simplifying a Volterra series model is prevented; the digital signal processing difficulty and complexity are reduced; and the complex nonlinear features of the power amplifier can be compensated well.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a power amplifier digital predistortion device and method based on a modified piecewise linear function. Background technique [0002] With the widespread application of the fourth-generation mobile communication system and the in-depth research on the fifth-generation mobile communication technology, the data traffic of the communication system is increasing day by day. The method leads to a higher signal peak-to-average ratio. The peak-to-average ratio of the broadband baseband signal has high requirements on the linearity of the RF power amplifier. The research focus of power amplifier linearization technology has gradually changed from the early linearization technologies such as feedforward method, feedback method and power combination to digital predistortion technology, and digital predistortion has become the most concerned linearization technology in rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3241
Inventor 翟建锋张雷于志强周健义
Owner SOUTHEAST UNIV
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