Predistortion feedback method, apparatus and system

A pre-distortion feedback and pre-distorter technology, applied in the field of communication, can solve the problems of difficult pre-distortion technology, increased cost of pre-distortion technology, and high requirements for analog-to-digital converters

Active Publication Date: 2014-06-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the existing pre-distortion technology has high requirements on the analog-to-digital converter, which increases the cost of the pre-distortion technology
And with the continuous development of communication technology, the signal bandwidth continues to increase, and the analog-to-digital converter is limited by pow

Method used

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  • Predistortion feedback method, apparatus and system
  • Predistortion feedback method, apparatus and system
  • Predistortion feedback method, apparatus and system

Examples

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Embodiment 1

[0101] An embodiment of the present invention provides a pre-distortion feedback method, which is a method on the side of the pre-distortion feedback device, such as figure 1 As shown, the method includes:

[0102] S101. The predistortion feedback device acquires an original signal from a baseband.

[0103] Pre-distortion technology means that before the original signal is sent to the power amplifier, the pre-distortion signal is obtained through the inverse model of the power amplifier, and then sent to the power amplifier, so that the output signal of the power amplifier is in good consistency with the original signal, and the power amplifier is eliminated. The resulting linear and nonlinear distortion of the signal.

[0104] In the pre-distortion feedback method provided by the embodiment of the present invention, first, the pre-distortion feedback device obtains the original signal from the baseband, and then subtracts the processed original signal from the down-converted...

Embodiment 2

[0129] The embodiment of the present invention also provides a predistortion feedback method, which is a method on the side of the predistorter, such as figure 2 As shown, the method includes:

[0130] S201. The predistorter receives the error signal sent by the predistortion feedback device and the values ​​of time delay and complex gain. The error signal is obtained by subtracting the analog signal from the down-converted feedback signal by the predistortion feedback device. The analog signal is the original signal obtained by the pre-distortion feedback device from the baseband, using a preset strategy to obtain the value of the time delay and complex gain required to process the original signal, and according to the time delay and complex gain The gain value is obtained by performing time delay and complex gain processing on the original signal, and then converting the time delay and complex gain processed original signal.

[0131] In the embodiment of the present invent...

Embodiment 3

[0136] An embodiment of the present invention provides a predistortion feedback method, such as image 3 As shown, the method includes:

[0137] S301. The predistorter acquires the original signal from the baseband.

[0138] Pre-distortion technology means that before the original signal is sent to the power amplifier, the pre-distortion signal is obtained through the inverse model of the power amplifier, and then sent to the power amplifier, so that the output signal of the power amplifier is in good consistency with the original signal, and the power amplifier is eliminated. The resulting linear and nonlinear distortion of the signal.

[0139] In the embodiment of the present invention, the inherent frequency band of the unmodulated original signal sent by the signal source is called the basic frequency band, or baseband for short.

[0140] In the predistortion feedback method provided by the embodiment of the present invention, firstly, the predistorter obtains the origin...

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Abstract

The embodiment of the invention provides a predistortion feedback method, an apparatus and a system, relating to the communication field, which reduces bandwidth of an AD converter in a predistorter and further reduces cost of the predistortion technology. The predistortion feedback method of the embodiment comprises: acquiring original signals from a base band; adopting preset strategy, acquiring values of time delay and complex gain demanded for processing the original signals; according to the values of time delay and complex gain, performing time delay and complex gain on the original signals; converting the original signals through time delay and complex gain into the simulation signals; substracting the feedback signals through down-conversion from the simulation signals to obtain the error signals; transmitting the values of the time delay and the complex gain to the predistorter, transmitting the error signals to the AD converter in the predistorter, to cause the predistorter to generate the predistortion signals according to the values of the time delay and the complex gain.

Description

technical field [0001] The present invention relates to the communication field, in particular to a predistortion feedback method, device and system. Background technique [0002] Predistortion technology (Predistortion, PD) is a widely used radio frequency power amplifier linearization technology, because of its simple principle, this technology has been widely used. The principle of pre-distortion technology is that before the original signal is sent to the power amplifier, the pre-distortion signal is obtained through the inverse model of the power amplifier, and then the pre-distortion signal is sent to the power amplifier, so that the output signal of the power amplifier is consistent with the original signal Maintain good consistency and eliminate linear and non-linear distortion produced by power amplifiers. [0003] In order to obtain a suitable predistortion signal, the method in the prior art is to couple the output end of the power amplifier to obtain a feedback ...

Claims

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Application Information

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IPC IPC(8): H04L25/49
CPCH04L25/49
Inventor 牟青周键
Owner HUAWEI TECH CO LTD
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