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Volterra-filtering-based power amplifier pre-distortion method for double-loop feedback model

A pre-distortion and pre-distorter technology, which is applied to improve amplifiers to reduce nonlinear distortion, impedance networks, adaptive networks, etc., can solve problems such as slow convergence speed, high complexity, etc. to ensure accuracy and reduce calculation Quantity and the effect of ensuring accuracy

Inactive Publication Date: 2012-08-01
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In view of the high complexity and slow convergence speed of the existing power amplifier linearization technology, which cannot meet the performance requirements of the next-generation high-speed wireless communication for the power amplifier, the present invention designs a power amplifier based on a Volterra filtering double-loop feedback model predistortion method

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  • Volterra-filtering-based power amplifier pre-distortion method for double-loop feedback model
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  • Volterra-filtering-based power amplifier pre-distortion method for double-loop feedback model

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Embodiment

[0029] The overall structure of the power amplifier pre-simulation solution in this embodiment is as follows figure 1 As shown, a two-stage first-order dynamic truncated Volterra filter model is used to construct a dual-loop feedback update system for the predistorter coefficients, which is used to compensate the nonlinear characteristics and memory effects of the power amplifier. The specific steps are:

[0030] Step 1: Utilize the high-speed analog-to-digital converter to collect the baseband input data of the predistorter, the baseband output data of the predistorter, and the baseband output data of the power amplifier after down-conversion processing by the attenuator, wherein the present embodiment selects a broadband multi-carrier signal Baseband input data for the predistorter.

[0031] At time n, the baseband input data of the predistorter is x(n), the baseband output data of the predistorter is u(n), and the baseband output data of the power amplifier after down-conv...

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Abstract

The invention discloses a Volterra-filtering-based power amplifier pre-distortion method for a double-loop feedback model. The method mainly comprises the three parts of pre-distortion crude parameter vector extraction, error regulation and pre-distorter fine parameter vector extraction, and specifically comprises the following steps of: performing down-conversion output and pre-distorter output by adopting a first-order dynamic truncation Volterra filtering structure to obtain a pre-distortion crude parameter vector in the pre-distortion crude parameter vector extraction; dynamically regulating an error vector caused by the pre-distortion crude parameter vector according to an average criterion; combining a regulated error vector which serves as an expected signal and a base-band input signal, and obtaining a pre-distorter fine parameter vector by adopting the first-order dynamic truncation Volterra filtering structure; and correcting the crude parameter vector by utilizing the fine parameter vector to obtain a final pre-distorter parameter vector. The problems of slow adaptive convergence, great pre-distortion parameter calculation amount, complexity in implementation, incapability of effectively compensating the complex memory effect of a power amplifier in high-speed communication, and the like of the conventional pre-distortion method are solved.

Description

technical field [0001] The invention relates to the technical field of digital communication, and relates to a predistortion method for power amplifier linearization, in particular to a power amplifier predistortion method based on a Volterra filtering double-loop feedback model. Background technique [0002] With the development of digital communication technology and the use of satellite communication technology in the civilian field, frequency band resources are becoming more and more precious. In order to improve the utilization rate of spectrum, various linear modulation technologies such as QPSK, 16-QAM and OFDM have been proposed. , these digital modulation methods belong to non-constant envelope modulation, therefore, the peak-to-average ratio is a common feature of the above-mentioned modulations, and the peak-to-average ratio has higher requirements for the linearization of the power amplifier; after the introduction of satellite communications, due to the satellite...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03H21/00
Inventor 唐成凯廉保旺张怡张玲玲何伟吴鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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