DPD (Digital Pre-Distortion) sub-band correction method suitable for multiple scenes and application

A frequency-divided, full-band technology, applied to parts, amplifiers, electrical components, etc. of the amplifying device, can solve the problems of increasing the complexity of the pre-distortion process, the amount of data processing, and the inability to correct signal characteristics, etc., to achieve a simple and complex structure low degree of effect

Active Publication Date: 2022-03-25
SHANGHAI WU QI MICROELECTRONICS CO LTD
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Problems solved by technology

However, the pre-distortion model in the above scheme needs to be divided into linear and nonlinear to construct a frequency-selective digital pre-distortion model, which increases the complexity of the pre-distortion process and the amount of data processing
On the other hand, the above scheme cannot perform targeted corrections for signal characteristics in different scenarios when setting the frequency band selection filter

Method used

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  • DPD (Digital Pre-Distortion) sub-band correction method suitable for multiple scenes and application
  • DPD (Digital Pre-Distortion) sub-band correction method suitable for multiple scenes and application
  • DPD (Digital Pre-Distortion) sub-band correction method suitable for multiple scenes and application

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Embodiment

[0049] The present invention provides a DPD branch filter architecture, in which a branch filter component is extended in the DPD circuit, and the coefficient of the branch filter can be modulated according to the requirements of different signal modulations to complete the correction of a specific frequency band, which is simple, efficient and stable high sex.

[0050] Specifically, see image 3 As shown, a DPD (Digital Pre-Distortion) device with branch filtering components includes a main path, a branch path and an adder.

[0051] A time-delay module is arranged on the path of the main road, and the baseband signal performs delay processing through the time-delay module after entering the main road. During specific setting, the time delay module may include a first time delay unit and a second time delay unit, through the first time delay unit and the second time delay unit, two time delay processes are sequentially performed on the baseband signal, through the two time de...

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Abstract

The invention discloses a DPD (Digital Pre-Distortion) sub-band correction method suitable for multiple scenes and application, and relates to the technical field of signal pre-distortion processing. The method comprises the following steps: inputting a baseband signal; the coefficient control module selects a branch filter coefficient corresponding to the current Mcs and then sends the branch filter coefficient to the branch filter module; and respectively inputting the baseband signal into a main path flow and a branch flow, performing time delay processing on the baseband signal in the main path flow, inputting the baseband signal into a nonlinear signal generation module in the branch flow, performing full-band LUT processing on the baseband signal to obtain a full-band nonlinear signal, and outputting the full-band nonlinear signal to the main path flow. The signal is input to a branch filter module for frequency band selection according to a branch filter coefficient to obtain a nonlinear signal with a specific frequency band; and adding the main path signal and the branch path signal in an adder to obtain a pre-distortion signal for correcting a specific frequency band. According to the method, coefficient selection of the filter can be controlled according to the signal type, and the method is suitable for multi-scene control, such as a WiFi/WiFi 6E system.

Description

technical field [0001] The present invention relates to the technical field of signal predistortion processing, in particular to a DPD sub-frequency band correction method applicable to multiple scenarios and its application. Background technique [0002] Signal amplification equipment is widely used in various electronic fields, among which the power amplifier PA (Power Amplifier, referred to as power amplifier) ​​is widely used. Because the PA circuit has nonlinear gain characteristics, its signal has nonlinear distortion, so it is necessary to adjust the signal For linearization, the commonly used linearization techniques include feed-forward technology and pre-distortion technology. Pre-distortion technology is to counteract the nonlinear distortion of the power amplifier by using anti-distortion at the input of the power amplifier. Pre-distortion can be divided into analog pre-distortion and digital pre-distortion DPD (Digital Pre-Distortion). Compared with analog pre-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3241Y02D30/70
Inventor 古强纵金榜
Owner SHANGHAI WU QI MICROELECTRONICS CO LTD
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