CN108631794B

CN108631794B - Control method and system for output signal of digital predistortion module

Info

Publication number: CN108631794B
Application number: CN201810311741.XA
Authority: CN
Inventors: 吕辉; 辛旭升; 张文; 何安科
Original assignee: Comba Telecom Systems China Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2020-03-13
Anticipated expiration: 2038-04-09
Also published as: CN108631794A

Abstract

The invention relates to a method and a system for controlling an output signal of a digital predistortion module, wherein the method comprises the following steps: extracting a baseband signal input into the digital predistortion module and a predistortion signal output by the digital predistortion module; determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal; and comparing the peak value expansion value with a first threshold value, and if the peak value expansion value is larger than the first threshold value, carrying out amplitude limiting on the predistortion signal and then outputting the predistortion signal. The method avoids the problem of low accuracy caused by the average power of the predistortion signal in the traditional technology, improves the accuracy of controlling the output signal of the digital predistortion module, enables the power of the predistortion signal of the digital predistortion module to be more accurately matched with the power amplification equipment at the later stage, and further provides protection for the power amplification equipment of the digital predistortion system. A computer device, a computer readable storage medium and a digital predistortion system are also provided.

Description

Control method and system for output signal of digital predistortion module

Technical Field

The present invention relates to the field of mobile communication technologies, and in particular, to a method and a system for controlling an output signal of a digital predistortion module, a computer device, a computer readable storage medium, and a digital predistortion system.

Background

With the development of the mobile communication technology field, in the existing mobile communication system, the power amplification module completes the power amplification function of the signal, and is a key module in the base station system. The digital predistortion technology is widely applied to the compensation of nonlinear distortion of a power amplifier, and aims to protect the power amplifier from being damaged due to abnormal input signals.

The traditional technology generally protects the power amplification module by judging whether the average power of the predistortion signal output by the digital predistortion module reaches a threshold value, however, because the subsequent power amplification module is usually designed based on parameters such as peak power and peak compression, the technology only compares the average power of the output signal of the digital predistortion module with the threshold value, is difficult to accurately control the output signal of the digital predistortion module, and is easy to cause that a signal with excessive power output by the digital predistortion module enters the subsequent power amplification equipment to cause equipment damage.

Disclosure of Invention

Based on this, it is necessary to provide a method and a system for controlling an output signal of a digital predistortion module, a computer device, a computer readable storage medium, and a digital predistortion system, aiming at the problem of inaccurate control of the output signal of the digital predistortion module in the conventional technology.

A control method for output signals of a digital predistortion module comprises the following steps:

extracting a baseband signal input into a digital predistortion module and a predistortion signal output by the digital predistortion module;

determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal;

and comparing the peak value expansion value with a first threshold value, and if the peak value expansion value is larger than the first threshold value, carrying out amplitude limiting on the predistortion signal and then outputting the predistortion signal.

The control method for the output signal of the digital predistortion module extracts the baseband signal and the predistortion signal, obtains the peak value expansion value of the digital predistortion module according to the baseband signal and the predistortion signal, compares the peak value expansion value with the first threshold value, and outputs the digital predistortion signal after amplitude limiting if the peak value expansion value is larger than the first threshold value, thereby avoiding the problem of low accuracy caused by the average power of the predistortion signal in the traditional technology, improving the accuracy of controlling the output signal of the digital predistortion module, enabling the power of the predistortion signal of the digital predistortion module to be more accurately matched with the power amplification equipment at the later stage, and further providing protection for the power amplification equipment of the digital predistortion system.

In one embodiment, the step of determining a peak extension value of the digital predistortion module for a set time period according to the baseband signal and the predistortion signal comprises:

calculating the peak-to-average ratio of the baseband signal in a set time length;

calculating the peak-to-average ratio of the predistortion signal in the set time length;

and carrying out difference operation on the peak-to-average ratio of the predistortion signal and the peak-to-average ratio of the baseband signal to obtain a peak value expansion value of the digital predistortion module within the set time length.

The technical scheme provided by the embodiment can acquire the peak value extension value of the digital predistortion module in a specific time period, and is beneficial to improving the accuracy of controlling the output signal of the digital predistortion module.

In one embodiment, the step of calculating the peak-to-average ratio of the baseband signal within a set time period includes:

acquiring a power value of the baseband signal within a set time length; calculating the average power of the baseband signal within the set time length and the peak power of the baseband signal within the set time length; and calculating the peak-to-average ratio of the baseband signal by using the ratio of the peak power and the average power of the baseband signal.

According to the technical scheme of the embodiment, the peak-to-average ratio of the baseband signal in a set time period can be accurately calculated through the power value and the peak power of the baseband signal in the set time period, so that the output signal of the digital predistortion module is accurately controlled.

In one embodiment, the step of calculating the peak-to-average ratio of the baseband signal by using the ratio of the peak power and the average power of the baseband signal comprises:

calculating the peak-to-average ratio of the baseband signal by adopting the following formula:

Peak_PAR1＝10×log10(P_peak1/P_average1)

wherein Peak _ PAR1 represents the Peak-to-average ratio of the baseband signal, P _ Peak1 represents the Peak power of the baseband signal, and P _ average1 represents the average power of the baseband signal.

In this embodiment, the peak-to-average ratio of the baseband signal is expressed as a logarithmic form of a ratio of the peak power of the baseband signal to the average power of the baseband signal, which is beneficial to improving the calculation efficiency of the peak-to-average ratio of the baseband signal, and improves the control efficiency of the output signal of the digital predistortion module while ensuring accurate control of the output signal of the digital predistortion module.

In one embodiment, the step of calculating the peak-to-average ratio of the predistortion signal in the set time length comprises:

acquiring a power value of the predistortion signal within the set time length; calculating the average power of the predistortion signal in the set time length and the peak power in the set time length; and calculating the peak-to-average ratio of the predistortion signal by using the ratio of the peak power and the average power of the predistortion signal.

According to the technical scheme of the embodiment, the peak-to-average ratio of the predistortion signal in a set time period can be accurately calculated through the power value and the peak power of the predistortion signal in the set time period, so that the output signal of the digital predistortion module is accurately controlled.

In one embodiment, the step of calculating the peak-to-average ratio of the predistortion signal by using the ratio of the peak power and the average power of the predistortion signal comprises:

calculating the peak-to-average ratio of the pre-distorted signal by adopting the following formula:

Peak_PAR2＝10×log10(P_peak2/P_average2)

wherein Peak _ PAR2 represents a Peak-to-average ratio of the predistortion signal, P _ Peak2 represents a Peak power of the predistortion signal, and P _ average2 represents a mean power of the predistortion signal.

In this embodiment, the peak-to-average ratio of the predistortion signal is represented as a logarithmic form of a ratio of the peak power of the predistortion signal to the average power of the predistortion signal, which is beneficial to improving the calculation efficiency of the peak-to-average ratio of the predistortion signal, and improves the control efficiency of the output signal of the digital predistortion module while ensuring accurate control of the output signal of the digital predistortion module.

In one embodiment, after the step of calculating the peak-to-average ratio of the predistortion signal, the method further includes:

comparing the peak-to-average ratio of the pre-distorted signal with a second threshold value; and if the peak-to-average ratio of the predistortion signal is larger than the second threshold value, the predistortion signal is output after amplitude limiting.

In this embodiment, a second threshold is added for the peak-to-average ratio of the predistortion signal output by the predistortion module, so that the output signal of the predistortion module is further accurately controlled, and the signal with excessive power can be prevented from entering the power amplifier equipment at the subsequent stage to cause equipment damage.

In one embodiment, the step of extracting the predistortion signal output by the digital predistortion module comprises:

and acquiring a predistortion signal obtained by the digital predistortion module performing predistortion operation on the baseband signal and a feedback signal fed back by the power amplification unit.

In the embodiment, the predistortion signal is obtained by combining the input baseband signal and the feedback signal fed back by the power amplification unit, so that the accuracy of obtaining the predistortion signal is improved, and the output signal of the digital predistortion module is accurately controlled.

In one embodiment, the step of limiting the output of the pre-distorted signal comprises:

carrying out threshold saturation truncation on the predistortion signal and then outputting the predistortion signal;

or

The step of controlling the predistortion signal of the digital predistortion module to carry out amplitude limiting output comprises the following steps:

turning off the predistortion signal.

According to the technical scheme provided by the embodiment, the predistortion signal is output or turned off after threshold saturation truncation is carried out on the predistortion signal, so that a signal with excessive power is prevented from being output from the predistortion module and entering subsequent equipment such as a power amplification unit, and the robustness and the reliability of the digital predistortion system are improved.

In one embodiment, the method further comprises the steps of:

and if the peak value expansion value is smaller than or equal to a first threshold value, outputting the predistortion signal.

The technical scheme provided by the embodiment ensures that the power of the output signal output from the predistortion module is not overlarge when the output signal is used by subsequent equipment, and improves the robustness and reliability of the digital predistortion system.

In one embodiment, after the step of performing threshold saturation truncation on the predistortion signal and outputting the predistortion signal, the method further includes:

converting the predistortion signal into an analog signal and carrying out filtering processing; performing radio frequency conversion on the filtered analog signal, and inputting the analog signal to a power amplification unit for power amplification and output;

or

After the step of outputting the predistortion signal, further comprising:

converting the predistortion signal into an analog signal and carrying out filtering processing; and performing radio frequency conversion on the filtered analog signal, and inputting the analog signal to a power amplification unit for power amplification and output.

In the embodiment, the predistortion signal output by the predistortion module is input to the power amplification unit for power amplification and output, so that the power of the signal entering the power amplification unit is not too high, and the robustness and the reliability of the digital predistortion power amplification system can be improved.

In one embodiment, after the step of inputting to the power amplifying unit for power amplifying output, the method further includes:

and receiving a feedback signal coupled by the power amplification unit through the digital predistortion module, and performing digital predistortion operation on the feedback signal and the baseband signal to obtain a predistortion signal.

In this embodiment, the digital predistortion module performs predistortion operation by using the feedback signal to obtain a predistortion signal, and provides data support for accurately controlling the output signal of the digital predistortion.

In one embodiment, there is provided a control system for an output signal of a digital predistortion module, comprising:

the extraction module is used for extracting a baseband signal input into the digital predistortion module and a predistortion signal output by the digital predistortion module;

the determining module is used for determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal;

and the output module is used for comparing the peak value expansion value with a first threshold value, and if the peak value expansion value is larger than the first threshold value, outputting the pre-distortion signal after amplitude limiting.

According to the control system for the output signal of the digital predistortion module, the baseband signal and the predistortion signal are extracted through the extraction module, the determination module is used for obtaining the peak value expansion value of the digital predistortion module according to the baseband signal and the predistortion signal, the peak value expansion value is compared with the first threshold value through the output module, if the peak value expansion value is larger than the first threshold value, the predistortion signal is output after amplitude limiting, the problem that the accuracy is low due to the average power of the predistortion signal in the traditional technology is solved, the accuracy of controlling the output signal of the digital predistortion module is improved, the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification equipment at the rear stage, and further protection is provided for the power amplification equipment of the digital predistortion system.

In one embodiment, a computer device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the method for controlling the output signal of the digital predistortion module according to any one of the above embodiments when executing the computer program.

According to the computer equipment, the accuracy of controlling the output signal of the digital predistortion module is improved through the computer program running on the processor, so that the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification equipment at the later stage, and further protection is provided for the power amplification equipment of the digital predistortion system.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements a method of controlling an output signal of a digital predistortion module as described in any of the above embodiments.

According to the computer storage medium, the accuracy of controlling the output signal of the digital predistortion module is improved through the stored computer program, so that the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification equipment at the later stage, and further protection is provided for the power amplification equipment of the digital predistortion system.

In one embodiment, there is provided a digital predistortion system comprising: the device comprises a digital predistortion module, a signal control module, a radio frequency sending module, a power amplification unit, a radio frequency feedback module and a detection module;

the digital predistortion module is used for carrying out digital predistortion processing on an input baseband signal and outputting a predistortion signal to the signal control module;

the signal control module is used for controlling and outputting the predistortion signal to the radio frequency transmission module;

the radio frequency transmitting module is used for performing radio frequency preprocessing on the signal output by the signal control module, inputting the signal to the power amplifying unit, amplifying the signal and outputting the amplified signal;

the radio frequency feedback module is used for feeding back the signal output by the power amplification unit to the digital predistortion module for digital predistortion operation;

the detection module is configured to execute the method for controlling the output signal of the digital predistortion module according to any one of the above embodiments, and the signal control module controls the predistortion signal output by the digital predistortion module.

In the digital predistortion system, the detection module is used for executing the control method of the output signal of the digital predistortion module according to any one of the embodiments, and the signal control module controls the predistortion signal output by the digital predistortion module, so that the accuracy of controlling the output signal of the digital predistortion module in the digital predistortion system is improved, the power of the predistortion signal of the digital predistortion module can be more accurately matched with a power amplification unit at the later stage, protection is provided for the power amplification equipment of the digital predistortion system, and the reliability and the safety of the work of the digital predistortion system are improved.

In one embodiment, the radio frequency transmission module includes: the digital-to-analog conversion module and the radio frequency transmitting and processing unit; the digital-to-analog conversion module is used for performing digital-to-analog conversion processing on the signal output by the signal control module and then outputting the signal; and the radio frequency sending and processing unit is used for filtering and radio frequency up-converting the signal output by the digital-to-analog conversion module and outputting the signal to the power amplification unit.

In the embodiment, the digital-to-analog conversion module and the radio frequency transmission processing unit are used for processing the signal output by the signal control module, so that the signal input to the power amplification unit can be accurately controlled, and the reliability and the safety of the work of the digital predistortion system are improved.

In one embodiment, the radio frequency feedback module comprises: a feedback radio frequency receiving and processing unit and an analog-to-digital conversion unit; the feedback radio frequency receiving and processing unit is used for receiving the signal output by the power amplifying unit, performing radio frequency processing and outputting the signal; and the analog-to-digital conversion unit is used for performing analog-to-digital conversion processing on the signal output by the feedback radio frequency receiving and processing unit and outputting the signal to the digital predistortion module.

In the embodiment, the feedback radio frequency receiving and processing unit and the analog-to-digital conversion unit are used for processing the signal output by the power amplification unit, so that the signal output to the digital predistortion module can be accurately controlled, and the reliability and the safety of the digital predistortion system are improved.

Drawings

FIG. 1 is a flow chart illustrating a method for controlling an output signal of a digital predistortion module in one embodiment;

FIG. 2 is a flow chart illustrating a method for controlling an output signal of a digital predistortion module in another embodiment;

FIG. 3 is a block diagram of a control system for the output signal of the digital predistortion module in one embodiment;

FIG. 4 is a block diagram of a digital predistortion system in one embodiment;

FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the terms "first \ second \ third" related to the embodiments of the present invention are merely used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence order if allowed. It should be understood that the terms first, second, and third, as used herein, are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein.

Referring to fig. 1, fig. 1 is a flowchart illustrating a method for controlling an output signal of a digital predistortion module in an embodiment, and in an embodiment, a method for controlling an output signal of a digital predistortion module is provided, which may include the following steps:

s101, extracting a baseband signal input into the digital predistortion module and a predistortion signal output by the digital predistortion module.

In this step, the digital predistortion module usually performs digital predistortion operation on an input baseband signal and a feedback signal coupled from a rear-stage power amplifier device to obtain a predistortion signal. In this step, the baseband signal input to the predistortion module may be extracted at the input port of the digital predistortion module, and the predistortion signal obtained by performing predistortion processing on the input baseband signal by the predistortion module may be extracted from the output port of the predistortion module.

And S102, determining a peak value expansion value of the digital predistortion module within a set time length according to the extracted baseband signal and the predistortion signal.

In this step, the extracted baseband signal within a set time span and the extracted predistortion signal within a corresponding time span may be used to calculate the peak extension value generated by the digital predistortion module within the time span according to the baseband signal and the predistortion signal.

And S103, comparing the peak value expansion value with a first threshold value, and if the peak value expansion value is larger than the first threshold value, limiting the amplitude of the predistortion signal and outputting the predistortion signal.

In this step, the digital predistortion module generally inputs the signal to the power amplifier device of the subsequent stage for power amplification, so the first threshold value may be set according to the parameters such as peak power, average power, peak compression, etc. related to the saturation region of the power amplifier device to be protected of the subsequent stage, so as to ensure that the digital predistortion module does not output the signal with excessive power to the power amplifier device of the subsequent stage.

The step is mainly to compare the obtained peak value extension value with a set first threshold value, and if the peak value extension value is greater than the set first threshold value, it indicates that if the signal power output by the digital predistortion module is too large, the predistortion signal output by the digital predistortion module needs to be output after amplitude limiting. Optionally, the predistortion signal may be output after threshold saturation truncation or directly turned off, so as to ensure that no signal with excessive power is output from the predistortion module and enters subsequent devices such as a power amplifier unit, thereby improving robustness and reliability of the digital predistortion system. Optionally, if the peak extension value is less than or equal to the first threshold value, the predistortion signal may be input to a post-amplification unit, so as to ensure that the power of a subsequent device of the output signal output from the predistortion module is not too high, thereby improving the robustness and reliability of the digital predistortion system.

The control method for the output signal of the digital predistortion module provided by the above embodiment extracts the baseband signal and the predistortion signal, and obtaining a peak value expansion value of the digital predistortion module according to the baseband signal and the predistortion signal, comparing the peak value expansion value with a first threshold value, if the peak value expansion value is larger than the first threshold value, outputting the predistortion signal after amplitude limiting, avoiding the problem of low accuracy caused by the average power of the predistortion signal in the traditional technology, improving the accuracy of controlling the output signal of the digital predistortion module, the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification equipment of the later stage, whether the predistortion peak signal enters a saturation working area of the power amplifier or not can be judged, and further, protection is provided for the power amplifier equipment of the digital predistortion system, and the robustness and reliability of the power amplifier unit are improved.

In one embodiment, the step of extracting the predistortion signal output by the digital predistortion module in step S101 may include:

and acquiring a predistortion signal obtained by carrying out predistortion operation on the baseband signal and the feedback signal fed back by the power amplification unit by the digital predistortion module.

Since the digital predistortion module generally performs predistortion operation on an input baseband signal and a feedback signal fed back by a post-stage power amplification device, the embodiment acquires the predistortion signal obtained by the digital predistortion module according to the input baseband signal and the predistortion signal obtained by performing predistortion operation on the power amplification unit, and acquires the predistortion signal by combining the input baseband signal and the feedback signal fed back by the power amplification unit, thereby improving the accuracy of acquiring the predistortion signal and ensuring that the output signal of the digital predistortion module is accurately controlled.

In one embodiment, the step of determining the peak extension value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal in step S102 may include:

calculating the peak-to-average ratio of the baseband signal in a set time length; calculating the peak-to-average ratio of the predistortion signal in the set time length; and carrying out difference operation on the peak-to-average ratio of the predistortion signal and the peak-to-average ratio of the baseband signal to obtain a peak value expansion value of the digital predistortion module within the set time length.

The peak-to-average ratio of the baseband signal and the predistortion signal in a set time length is mainly used to calculate the peak extension value of the digital predistortion module in the time length. The set time length may be set to a section of effective data length for the signal according to different signal systems, for example, several tens of microseconds, and assuming that the sampling frequency of the digital predistortion module is 245.76Msps, the clock period is 4ns, and the sampling data length is about 4096 when 20 microseconds are taken.

The extracted power values of the baseband signal and the digital predistortion signal within a period of time can be utilized to respectively calculate the peak-to-average ratio of the baseband signal and the digital predistortion signal within the period of time, and the peak-to-average ratio of the predistortion signal and the peak-to-average ratio of the baseband signal are subjected to difference operation to obtain a peak value expansion value generated by the digital predistortion module within the period of time. In the embodiment, the peak extension value of the digital predistortion module is obtained by performing difference operation on the peak-to-average ratio of the baseband signal and the predistortion signal within a set time length, so that the scheme can obtain the peak extension value of the digital predistortion module in a specific time period, and is favorable for improving the accuracy of controlling the output signal of the digital predistortion module.

In one embodiment, further, the peak-to-average ratio of the baseband signal within a set time period may be calculated by:

acquiring a power value of a baseband signal within a set time length; calculating the average power of the baseband signal within the set time length and the peak power of the baseband signal within the set time length; and calculating the peak-to-average ratio of the baseband signal by using the ratio of the peak power and the average power of the baseband signal.

The embodiment mainly obtains the power value of the baseband signal in a period of time, calculates the average power of the baseband signal in the period of time, determines the peak power in the set period of time, and calculates the peak-to-average ratio of the baseband signal by using the ratio of the peak power and the average power. According to the technical scheme of the embodiment, the peak-to-average ratio of the baseband signal in a set time period can be accurately calculated through the power value and the peak power of the baseband signal in the set time period, so that the output signal of the digital predistortion module is accurately controlled.

In general, the peak-to-average ratio of the baseband signal can be calculated using the following formula:

Peak_PAR1＝10×log10(P_peak1/P_average1)

here, Peak _ PAR1 represents the Peak-to-average ratio of the baseband signal, P _ Peak1 represents the Peak power of the baseband signal, and P _ average1 represents the average power of the baseband signal.

In one embodiment, further, the following steps may also be adopted to calculate the peak-to-average ratio of the predistortion signal within a set time length:

acquiring the power value of the predistortion signal within the set time length; calculating the average power of the predistortion signal in the set time length and the peak power in the set time length; and calculating the peak-to-average ratio of the predistortion signal by using the ratio of the peak power and the average power of the predistortion signal.

The embodiment may obtain a power value of the predistortion signal in a time length corresponding to the baseband signal, calculate an average power of the predistortion signal by using the power value of the predistortion signal in the time length, calculate a peak power of the predistortion signal in the set time length, and calculate a peak-to-average ratio of the predistortion signal by using a ratio of the obtained peak power and the average power. According to the technical scheme of the embodiment, the peak-to-average ratio of the predistortion signal in a set time period can be accurately calculated through the power value and the peak power of the predistortion signal in the set time period, so that the output signal of the digital predistortion module is accurately controlled.

The peak-to-average ratio of the pre-distorted signal can be calculated using the following formula:

Peak_PAR2＝10×log10(P_peak2/P_average2)

where Peak _ PAR2 represents the Peak-to-average ratio of the predistortion signal, P _ Peak2 represents the Peak power of the predistortion signal, and P _ average2 represents the average power of the predistortion signal.

In one embodiment, after the step of calculating the peak-to-average ratio of the pre-distorted signal, the following steps may be further included:

and comparing the peak-to-average ratio of the predistortion signal with a second threshold value, and if the peak-to-average ratio of the predistortion signal is greater than the second threshold value, carrying out amplitude limiting on the predistortion signal and then outputting the predistortion signal.

The second threshold is set for the peak-to-average ratio of the predistortion signal output by the predistortion module, and if the peak-to-average ratio of the predistortion signal is greater than the second threshold, it may also be considered that the power of the predistortion signal output by the predistortion module is too large, and the predistortion module needs to be output after amplitude limiting.

Because the peak value of the predistortion signal is easy to cause signal overflow and generate spurious, under the condition that the peak value expansion value is not very large, the signal output by the digital predistortion module also needs to be controlled, for example, the mean value of the input baseband signal is-12 dBFs, the peak-to-average ratio of the baseband signal is 8dB, the mean value of the output signal of the digital predistortion module is still-12 dBFs, the peak-to-average ratio of the output signal of the digital predistortion module is 13dB, and the peak value expansion value is 5dB, at this moment, the maximum peak value signal overflows first, and the margin is only 4 dB. Therefore, in order to protect the devices at the later stage, a maximum peak protection mode is set for the peak-to-average ratio of the predistortion signal, so that even if the input signal is backed off by several dB, the digital predistortion module needs to use different coefficient sets in some cases, and the coefficient at this time causes that the peak expansion value may be larger than 4dB, and as long as the maximum peak value is not exceeded, the updated coefficient of the digital predistortion module is still valid.

In one embodiment, after the step of outputting the predistortion signal after threshold saturation truncation or outputting the predistortion signal in step S103, the following steps may be further included:

converting the output predistortion signal into an analog signal, and carrying out filtering processing; and performing radio frequency conversion on the filtered analog signal, and inputting the analog signal to a power amplification unit for power amplification and output.

The present embodiment is mainly implemented when a predistortion signal output by the predistortion module is output after threshold saturation truncation or directly output to a post-amplification device, the digital-to-analog conversion module may be used to perform digital-to-analog conversion on the output predistortion signal, the radio frequency transmission processing unit may be used to perform filtering and radio frequency up-conversion processing, and the signal is input to the power amplification unit to perform power amplification and output.

In one embodiment, after the signal is input to the power amplification unit for power amplification and output, the feedback signal coupled by the power amplification unit may be received by the digital predistortion module, and the digital predistortion operation is performed on the feedback signal and the baseband signal to obtain a predistortion signal.

In this embodiment, after the signal is input to the power amplifying unit for power amplification and output, the feedback rf receiving and processing unit may be used to couple a feedback signal from the power amplifying unit, and the analog-to-digital conversion module may be used to perform analog-to-digital conversion on the feedback signal and input the feedback signal to the digital predistortion module, so that the digital predistortion module performs predistortion operation on the feedback signal to obtain a predistortion signal, and provides data support for accurately controlling the output signal of the digital predistortion.

In an embodiment, referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling an output signal of a digital predistortion module in another embodiment, and the method for controlling an output signal of a digital predistortion module may include the following steps:

s301, the digital predistortion module collects an input baseband signal and a feedback signal to carry out operation, and a predistortion signal is obtained. The Digital predistortion module inputs a baseband signal and a feedback signal to carry out Digital predistortion, namely DPD and Digital Pre-Distortion operation, so as to obtain a predistortion signal.

S302, extracting digital predistortion input and output signals, calculating a peak value expansion value, and comparing the peak value expansion value with a threshold value. The calculation of the peak spread value of this step may be performed by:

s1, counting the average power P _ average1 of the input signal of the predistortion module in a period of time and the power of the Peak P _ Peak1 in the period of time, calculating the ratio of the Peak power to the average power in the period of time, and converting the ratio into dB, i.e. Peak _ PAR1 is 10 × log10(P _ Peak1/P _ average 1);

s2, counting the average power P _ average2 of the output signal of the digital predistortion module with the same time length and the power of the Peak P _ Peak2 in the period, and converting the average power into dB, that is, Peak _ PAR2 is 10 × log10(P _ Peak2/P _ average 2);

s3, calculating the Peak expansion Peak _ expansion of the signal generated by the digital pre-distortion module in the time length,

Peak_expansion＝Peak_PAR2-Peak_PAR1。

s303, judging whether the peak value expansion value is larger than a threshold value.

The calculated peak value expansion value may be compared with a set threshold value, where the threshold setting may include 2 ways:

a) only the size of the peak expansion value is considered; b) and setting a maximum peak signal threshold, namely setting a threshold of a pre-distortion signal peak-to-average ratio, according to the average power of the output signal of the digital pre-distortion module.

If the threshold value is greater than the threshold value, S304 is executed, otherwise S305 is executed.

And S304, outputting or turning off the signal saturation truncation exceeding the threshold.

Judging whether the peak value expansion of the signal passing through the digital predistortion module is smaller than a set threshold, if so, not starting protection, and directly passing the signal; if not, the signal exceeding the threshold is output according to a set mode. The signal exceeding the threshold can be output in 2 ways: one is a threshold saturation truncated output, and the other is to directly turn off the peak signal output.

S305, converting the signal output by the digital predistortion into an analog signal, filtering, performing radio frequency up-conversion, and then transmitting.

And S306, inputting the radio frequency signal into a power amplifier and then outputting the radio frequency signal.

And S307, coupling a feedback signal from the power amplifier output signal, and sending the feedback signal to the digital predistortion module for predistortion operation.

The method for controlling the output signal of the digital predistortion module provided by the embodiment avoids the problem of low accuracy caused by the average power of the predistortion signal in the prior art, improves the accuracy of controlling the output signal of the digital predistortion module, enables the power of the predistortion signal of the digital predistortion module to be more accurately matched with the power amplification equipment at the later stage, and can judge whether the predistortion peak signal enters the saturation working area of the power amplifier, thereby providing protection for the power amplifier equipment of the digital predistortion system and improving the robustness and reliability of the power amplifier unit.

In an embodiment, referring to fig. 3, fig. 3 is a schematic structural diagram of a control system of an output signal of a digital predistortion module in an embodiment, and provides a control system of an output signal of a digital predistortion module, including:

an extraction module 101, configured to extract a baseband signal input to the digital predistortion module and a predistortion signal output by the digital predistortion module;

a determining module 102, configured to determine a peak extension value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal;

and the output module 103 is configured to compare the peak extension value with a first threshold, and if the peak extension value is greater than the first threshold, output the pre-distortion signal after amplitude limiting.

The control system for the output signal of the digital predistortion module extracts the baseband signal and the predistortion signal through the extraction module 101, obtains the peak value expansion value of the digital predistortion module according to the baseband signal and the predistortion signal through the determination module 102, compares the peak value expansion value with the first threshold value through the output module 103, and outputs the predistortion signal after amplitude limiting if the peak value expansion value is larger than the first threshold value, thereby avoiding the problem of low accuracy caused by the average power of the predistortion signal in the traditional technology, improving the accuracy of controlling the output signal of the digital predistortion module, enabling the power of the predistortion signal of the digital predistortion module to be more accurately matched with the power amplification equipment at the rear stage, judging whether the predistortion peak signal enters the saturation working area of the power amplifier, and further providing protection for the power amplification equipment of the digital predistortion system, the robustness and the reliability of the power amplification unit are improved.

The control system of the output signal of the digital predistortion module of the invention corresponds to the control method of the output signal of the digital predistortion module of the invention one to one, and the technical characteristics and the beneficial effects described in the embodiment of the control method of the output signal of the digital predistortion module are all applicable to the embodiment of the control system of the output signal of the digital predistortion module, so that the statement is made.

In an embodiment, referring to fig. 4, fig. 4 is a schematic structural diagram of a digital predistortion system in an embodiment, and provides a digital predistortion system, which may include: a digital predistortion module 310, a signal control module 320, a radio frequency transmission module 330, a power amplification unit 340, a radio frequency feedback module 350 and a detection module 360;

the digital predistortion module 310 is configured to perform digital predistortion processing on an input baseband signal, and output a predistortion signal to the signal control module 320;

the signal control module 320 is configured to control and output the predistortion signal to the radio frequency transmitting module 330;

the radio frequency transmitting module 330 is configured to perform radio frequency preprocessing on the signal output by the signal control module 320, and input the signal to the power amplifying unit 340 for amplification and then output the signal;

the rf feedback module 350 is configured to feed back the signal output by the power amplification unit to the digital predistortion module 310 for digital predistortion operation;

the detection module 360 is configured to perform the method for controlling the output signal of the digital predistortion module according to any of the above embodiments, and the predistortion signal output by the digital predistortion module 310 is controlled by the signal control module 320.

In one embodiment, the rf transmitting module 330 may include: a digital-to-analog conversion module 331 and a radio frequency transmission processing unit 332;

the digital-to-analog conversion module 331 is configured to perform digital-to-analog conversion on the signal output by the signal control module 320 and output the signal; the radio frequency transmitting and processing unit 332 is configured to filter and perform radio frequency up-conversion on the signal output by the digital-to-analog conversion module 331, and output the signal to the power amplification unit 340.

In this embodiment, the digital-to-analog conversion module and the radio frequency transmission processing unit are used to process the signal output by the signal control module, so that the signal input to the power amplification unit can be accurately controlled.

In one embodiment, the rf feedback module 350 may include: a feedback rf receiving processing unit 352 and an analog-to-digital conversion unit 351;

the feedback rf receiving and processing unit 352 is configured to receive the signal output by the power amplifying unit 340, perform rf processing, and output the signal; the analog-to-digital conversion unit 351 is configured to perform analog-to-digital conversion on the signal output by the feedback rf receiving and processing unit 352 and output the signal to the digital predistortion module 310.

In this embodiment, the feedback rf receiving and processing unit and the analog-to-digital conversion unit are used to process the signal output by the power amplification unit, so that the signal output to the digital predistortion module can be accurately controlled.

The digital predistortion system provided in any of the above embodiments may utilize the detection module to execute the method for controlling the output signal of the digital predistortion module described in any of the above embodiments, and control the predistortion signal output by the digital predistortion module through the signal control module, so as to improve the accuracy of controlling the output signal of the digital predistortion module in the digital predistortion system, so that the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification unit of the subsequent stage, thereby providing protection for the power amplification device of the digital predistortion system, and improving the reliability and safety of the operation of the digital predistortion system.

Based on the examples described above, there is also provided in one embodiment a computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, implements the method for controlling the output signal of the digital predistortion module as in any one of the embodiments described above.

In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:

extracting a baseband signal input into the digital predistortion module and a predistortion signal output by the digital predistortion module; determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal; and comparing the peak value expansion value with a first threshold value, and if the peak value expansion value is larger than the first threshold value, carrying out amplitude limiting on the predistortion signal and then outputting the predistortion signal.

In one embodiment, the processor, when executing the computer program, further performs the steps of:

Peak_PAR1＝10×log10(P_peak1/P_average1)

Peak_PAR2＝10×log10(P_peak2/P_average2)

comparing the peak-to-average ratio of the pre-distorted signal with a second threshold value; and if the peak-to-average ratio of the predistortion signal is larger than the second threshold value, carrying out amplitude limiting on the predistortion signal and then outputting the amplitude limited predistortion signal.

and acquiring a predistortion signal obtained by carrying out predistortion operation on the baseband signal and a feedback signal fed back by the power amplification unit by a digital predistortion module.

and outputting or switching off the predistortion signal after threshold saturation truncation is carried out on the predistortion signal.

and if the peak value expansion value is less than or equal to the first threshold value, outputting a predistortion signal.

converting the predistortion signal into an analog signal, and carrying out filtering processing; and performing radio frequency conversion on the filtered analog signal, and inputting the analog signal to a power amplification unit for power amplification and output.

and receiving the feedback signal coupled by the power amplification unit through the digital predistortion module, and performing digital predistortion operation on the feedback signal and the baseband signal to obtain a predistortion signal.

In one embodiment, a computer device is provided, and the computer device may be a terminal, and its internal structure diagram may be as shown in fig. 5, and fig. 5 is an internal structure diagram of the computer device in one embodiment. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of controlling an output signal of a digital predistortion module. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments may be implemented by a computer program, which is stored in a non-volatile computer readable storage medium, and in the embodiments of the present invention, the program may be stored in the storage medium of a computer system and executed by at least one processor in the computer system to implement the processes including the embodiments of the sleep assistance methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

Accordingly, in an embodiment, a storage medium is further provided, on which a computer program is stored, wherein the program, when executed by a processor, implements a method for controlling an output signal of a digital predistortion module as in any one of the above embodiments.

The computer storage readable storage medium improves the accuracy of controlling the output signal of the digital predistortion module through the stored computer program, so that the power of the predistortion signal of the digital predistortion module can be more accurately matched with the power amplification equipment at the later stage, and further protection is provided for the power amplification equipment of the digital predistortion system.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

In one embodiment, the computer program when executed by the processor further performs the steps of:

Peak_PAR1＝10×log10(P_peak1/P_average1)

Peak_PAR2＝10×log10(P_peak2/P_average2)

Those skilled in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Random Access Memory (RAM), a Read-Only Memory (ROM), a magnetic disk, and an optical disk.

Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a RAM, a ROM, a magnetic or optical disk, or various other media that can store program code.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A control method for an output signal of a digital predistortion module is characterized by comprising the following steps:

determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal; the method comprises the following steps: calculating the peak-to-average ratio of the baseband signal in a set time length; calculating the peak-to-average ratio of the predistortion signal in the set time length; performing difference operation on the peak-to-average ratio of the predistortion signal and the peak-to-average ratio of the baseband signal to obtain a peak value expansion value of the digital predistortion module within the set time length;

2. The method as claimed in claim 1, wherein the step of calculating the peak-to-average ratio of the baseband signal within a predetermined time period comprises:

acquiring a power value of the baseband signal within a set time length;

calculating the average power of the baseband signal within the set time length and the peak power of the baseband signal within the set time length;

and calculating the peak-to-average ratio of the baseband signal by using the ratio of the peak power and the average power of the baseband signal.

3. The method of claim 2, wherein the step of calculating the peak-to-average ratio of the baseband signal using the ratio of the peak power to the average power of the baseband signal comprises:

Peak_PAR1＝10×log10(P_peak1/P_average1)

4. The method of claim 1, wherein the step of calculating the peak-to-average ratio of the predistortion signal within the set time period comprises:

acquiring a power value of the predistortion signal within the set time length;

calculating the average power of the predistortion signal in the set time length and the peak power in the set time length;

and calculating the peak-to-average ratio of the predistortion signal by using the ratio of the peak power and the average power of the predistortion signal.

5. The method of claim 4, wherein the step of calculating the peak-to-average ratio of the pre-distorted signal using the ratio of the peak power to the average power of the pre-distorted signal comprises:

Peak_PAR2＝10×log10(P_peak2/P_average2)

6. The method of claim 4, further comprising, after the step of calculating the peak-to-average ratio of the predistortion signal:

comparing the peak-to-average ratio of the pre-distorted signal with a second threshold value;

and if the peak-to-average ratio of the predistortion signal is larger than the second threshold value, the predistortion signal is output after amplitude limiting.

7. The method of claim 1, wherein the step of extracting the predistortion signal output by the digital predistortion module comprises:

8. The method for controlling the output signal of the digital predistortion module according to any of the claims 1 to 7, wherein the step of performing the output after the amplitude limiting on the predistortion signal comprises:

or

The step of outputting the pre-distorted signal after amplitude limiting comprises the following steps:

turning off the predistortion signal.

9. The method for controlling the output signal of the digital predistortion module as set forth in claim 8, further comprising the steps of:

10. The method for controlling an output signal of a digital predistortion module according to claim 9, further comprising, after the step of performing threshold saturation truncation on the predistortion signal and outputting the predistortion signal, the steps of:

or

After the step of outputting the predistortion signal, further comprising:

11. The method for controlling an output signal of a digital predistortion module as set forth in claim 10, further comprising, after the step of inputting to the power amplification unit for power amplification output:

12. A system for controlling an output signal of a digital predistortion module, comprising:

the determining module is used for determining a peak value expansion value of the digital predistortion module within a set time length according to the baseband signal and the predistortion signal; further for: calculating the peak-to-average ratio of the baseband signal in a set time length; calculating the peak-to-average ratio of the predistortion signal in the set time length; performing difference operation on the peak-to-average ratio of the predistortion signal and the peak-to-average ratio of the baseband signal to obtain a peak value expansion value of the digital predistortion module within the set time length;

13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method of controlling an output signal of a digital predistortion module as claimed in any one of claims 1 to 11 when executing the computer program.

14. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of controlling an output signal of a digital predistortion module as set forth in any one of claims 1 to 11.

15. A digital predistortion system, comprising: the device comprises a digital predistortion module, a signal control module, a radio frequency sending module, a power amplification unit, a radio frequency feedback module and a detection module;

the detection module is configured to perform the method for controlling the output signal of the digital predistortion module according to any one of claims 1 to 11, and the signal control module controls the predistortion signal output by the digital predistortion module.

16. The digital predistortion system of claim 15, wherein the radio frequency transmission module comprises: the digital-to-analog conversion module and the radio frequency transmitting and processing unit;

the digital-to-analog conversion module is used for performing digital-to-analog conversion processing on the signal output by the signal control module and then outputting the signal;

and the radio frequency sending and processing unit is used for filtering and radio frequency up-converting the signal output by the digital-to-analog conversion module and outputting the signal to the power amplification unit.

17. The digital predistortion system of claim 15 or 16, wherein the rf feedback module comprises: a feedback radio frequency receiving and processing unit and an analog-to-digital conversion unit;

the feedback radio frequency receiving and processing unit is used for receiving the signal output by the power amplifying unit, performing radio frequency processing and outputting the signal;

and the analog-to-digital conversion unit is used for performing analog-to-digital conversion processing on the signal output by the feedback radio frequency receiving and processing unit and outputting the signal to the digital predistortion module.