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Digital pre-distortion correction method and system for double-loop solution

A digital pre-distortion and correction method technology, applied in the field of communication, can solve problems such as no way to meet real-time requirements, long-term correction goals, slow iteration speed, etc., to achieve the effect of improving convergence speed, reducing iteration times, and eliminating residual errors

Inactive Publication Date: 2021-07-13
上海矽昌微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is effective, the iteration speed is slow, and it takes a long time to achieve the correction target, and there is no way to meet the real-time requirements

Method used

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  • Digital pre-distortion correction method and system for double-loop solution
  • Digital pre-distortion correction method and system for double-loop solution
  • Digital pre-distortion correction method and system for double-loop solution

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Embodiment 1

[0069] The present invention includes a digital pre-distortion correction method for double-loop solution, such as figure 1 As shown, it specifically includes the following steps:

[0070] Step S1, continuously collecting the baseband signal currently input to a digital predistortion model, and the feedback signal currently output by the power amplifier;

[0071] Step S2, performing rough calculation processing on the predistortion signal output after the baseband signal is processed by the digital predistortion model and a part of the feedback signal output by the power amplifier, and outputting a first calculation coefficient to the digital predistortion model;

[0072] Step S3, performing fine calculation processing on another part of the feedback signal, and outputting a second calculation coefficient to the digital predistortion model;

[0073] In step S4, the final pre-distortion calculation coefficient is obtained according to the first calculation coefficient and the ...

Embodiment 2

[0122] The present invention also provides a double-loop digital predistortion correction system, including a digital predistortion model 1, a power amplifier 2, the output end of the digital predistortion model 1 is connected to the input end of the power amplifier 2, and the digital predistortion model The first input terminal of 1 is used to receive the baseband signal BB; image 3 shown, also includes:

[0123] The acquisition module continuously acquires the baseband signal BB currently input to the digital predistortion model 1, and the feedback signal FB currently output by the power amplifier 2, and performs amplitude phase alignment on the baseband signal and the feedback signal;

[0124] Rough solution module 3, the first input terminal of the rough solution module 3 is connected to the output terminal of the digital predistortion module 1, the second input terminal of the rough solution module 3 is connected to the output terminal of the power amplifier 2, the rough...

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Abstract

The invention relates to the technical field of communication, in particular to a digital pre-distortion correction method for double-loop resolving, which specifically comprises the following steps of: S1, continuously acquiring a baseband signal currently input to a digital pre-distortion model and a feedback signal currently output by a power amplifier; s2, performing coarse calculation processing on a pre-distortion signal output after the baseband signal is processed by the digital pre-distortion model and a part of feedback signal output by the power amplifier, and outputting a first calculation coefficient to the digital pre-distortion model; s3, performing fine resolving processing on the other part of feedback signals, and outputting a second resolving coefficient to the digital pre-distortion model; s4, obtaining a final pre-distortion calculation coefficient according to the first calculation coefficient and the second calculation coefficient so as to correct the digital preset true model. The method has the beneficial effects that the convergence speed of iteration of the digital pre-distortion model can be improved by combining rough calculation and fine calculation, and residual errors can be effectively eliminated.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a digital pre-distortion correction method and system for double-loop calculation. Background technique [0002] With the advent of the 5G era, the nonlinear composition of RF power amplifier equipment is becoming increasingly complex, which puts forward higher requirements for the correction capability of the digital domain. The traditional digital pre-distortion (Digital Pre-Distortion, DPD for short) method relies on a relatively complex memory model, and there is no way to achieve fast performance convergence, and it is difficult to meet the increasing performance requirements of operators. The current mainstream DPD correction method is based on the general memory polynomial (GMP) model, and the GMP model is corrected by collecting data continuously and iterating round after round to achieve gradual convergence. Although this method is effective, the iteration speed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/32
Inventor 朱可徐进张炜王胜
Owner 上海矽昌微电子有限公司
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