CN113630361A - Peak value data acquisition method, data acquisition device and storage medium - Google Patents
Peak value data acquisition method, data acquisition device and storage medium Download PDFInfo
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- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
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Abstract
The method comprises the steps of adjusting a peak power threshold of instantaneous power of a downlink digital signal to be detected, detecting the instantaneous peak power of the downlink digital signal after a data acquisition request is received, and acquiring a forward transmitting signal and a feedback receiving signal with the same length according to preset time delay set by a downlink data rate when the instantaneous peak power exceeds the peak power threshold. Through the mode, the peak power threshold is adjusted in a self-adaptive mode, so that data exceeding the peak power threshold can be captured more stably and accurately for digital predistortion parameter estimation, the reliability of data acquisition of a predistortion system is effectively guaranteed, in addition, data acquisition is delayed, the maximum peak value of the acquired signal is in the middle position of the acquired data sequence, and the peak signal is prevented from being cut off during data calibration.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a peak data sampling method, a data sampling apparatus, and a storage medium.
Background
In the 5G era, a base station radio frequency transmission system generally uses a high-gain power amplifier, but the power amplifier generates strong nonlinear distortion interference when performing signal amplification, which affects the performance of a communication system. In the prior art, the nonlinear Distortion is mostly calibrated by using a Digital Pre-Distortion (DPD) technology. The DPD has the basic principle that a coupled signal at a transmitting end after power amplification is sampled, and power amplification distortion parameters are extracted to perform reverse modeling of the power amplification. Because the DPD models the power amplifier nonlinear distortion by sampling the feedback signal, the sampling signal for parameter estimation should contain the power amplifier nonlinear distortion characteristic as much as possible to ensure the accuracy of parameter estimation. Researches show that the nonlinear distortion of the power amplifier is mainly caused by the fact that a large peak signal enters a nonlinear working area of the power amplifier and is compressed, and therefore a method capable of accurately collecting the large peak signal of a downlink power amplifier link is needed to ensure the accuracy of power amplifier modeling.
Disclosure of Invention
The application provides a peak value data acquisition method, a data acquisition device and a storage medium of a digital predistortion system, which can accurately acquire a large peak value signal of a downlink digital link so as to ensure the accuracy of power amplifier modeling.
In order to solve the technical problem, the application adopts a technical scheme that: provided is a data acquisition method including: adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected;
detecting the instantaneous peak power of a downlink digital signal after receiving a data acquisition request;
and when the instantaneous peak power exceeds the peak power threshold, acquiring a forward transmitting signal and a feedback receiving signal with the same length according to a preset time delay, wherein the preset time delay is set according to a downlink data rate.
In one embodiment, adjusting the peak power threshold of the instantaneous power of the downlink digital signal further comprises:
detecting the instantaneous peak power of the downlink digital signal to be detected, and comparing the instantaneous peak power of the downlink digital signal to be detected with the peak power threshold;
when the number of times that the instantaneous peak power of the downlink digital signal to be detected continuously exceeds the peak power threshold reaches a first counting threshold value, correspondingly increasing the peak power threshold according to a first adjustment step;
and when the number of times that the instantaneous peak power of the downlink digital signal to be detected is continuously lower than the peak power threshold reaches a second counting threshold value, correspondingly reducing the peak power threshold according to a second adjustment step.
In one embodiment, the first count threshold value is less than the second count threshold value.
In one embodiment, the first adjustment step value is greater than the second adjustment step value.
In an embodiment, the adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected further includes:
writing the peak power threshold, the first counting threshold value, the second counting threshold value and the initialization configuration values of the first adjustment step and the second adjustment step;
and carrying out zero clearing operation on the counter.
In an embodiment, after receiving the data acquisition request, before detecting the instantaneous peak power of the downstream digital signal, the method further includes:
stopping adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected, and latching the peak power threshold.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a data collecting apparatus including:
the power threshold adjusting module is used for adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected;
the power detection module is used for detecting the instantaneous peak power of the downlink digital signal after receiving the data acquisition request;
and the data acquisition module is used for acquiring the forward transmitting signal and the feedback receiving signal with the same length according to preset time delay when the instantaneous peak power exceeds the peak power threshold, wherein the preset time delay is set according to a downlink data rate.
In an embodiment, the power threshold adjustment module is further configured to:
detecting the instantaneous peak power of the downlink digital signal to be detected, and comparing the instantaneous peak power of the downlink digital signal to be detected with the peak power threshold;
when the number of times that the instantaneous peak power of the downlink digital signal to be detected continuously exceeds the peak power threshold reaches a first counting threshold value, correspondingly increasing the peak power threshold according to a first adjustment step;
and when the number of times that the instantaneous peak power of the downlink digital signal to be detected is continuously lower than the peak power threshold reaches a second counting threshold set value, correspondingly reducing the peak power threshold according to a second adjustment step.
In one embodiment, the first count threshold value is less than the second count threshold value.
In order to solve the above technical problem, the present application adopts another technical solution: a non-volatile storage cutoff is provided that stores instructions that, when executed, implement the above-described data collection method.
The beneficial effect of this application is: the peak power threshold of the instantaneous power of the downlink digital signal to be detected is continuously adjusted in a self-adaptive manner, so that the instantaneous peak power of the downlink digital signal is detected after a data acquisition request is received, data exceeding the peak power threshold can be more stably and accurately captured for digital predistortion parameter estimation, the acquisition reliability of a predistortion system is effectively ensured, further, when the instantaneous peak power exceeds the peak power threshold, forward transmitting signals and feedback receiving signals with the same length are acquired in a delayed manner according to the downlink data rate, the maximum peak value of the acquired signals is positioned in the middle of an acquired data sequence, and the peak signals are prevented from being cut off during data calibration.
Drawings
Fig. 1 is a schematic diagram of a predistortion system provided by an embodiment of the present application;
FIG. 2 is a schematic flow chart of a data acquisition method provided in an embodiment of the present application;
fig. 3 is a schematic flow diagram of a sub-part of a data collection method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a data acquisition device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the current 5G system, the high gain power amplifier used generates strong nonlinear distortion including intermodulation distortion and in-band distortion when amplifying the signal. Intermodulation distortion causes an increase in Adjacent Channel Power Ratio (ACPR), producing more severe adjacent channel interference, while in-band distortion causes an increase in Error Vector Magnitude (EVM). Therefore, researchers in the field are always searching for a solution, a more traditional scheme is to adopt power backoff, but it is difficult to find a power amplifier nonlinear point meeting requirements, and reducing the efficiency of a power amplifier increases the cost, so that the existing requirements cannot be met. As shown in fig. 1, the principle of the DPD technique is to perform predetermined inverse distortion on the amplitude and phase of the power amplifier input signal in advance to cancel the nonlinear distortion of the power amplifier. The method comprises the steps of sampling a coupling signal at a rear transmitting end of a power amplifier, extracting power amplifier distortion parameters and carrying out reverse modeling on the power amplifier, wherein data acquisition is important to stability of modeling, and a data screening method for modeling of a digital predistortion system needs to be provided.
The embodiment of the application provides a peak value data acquisition method of a digital predistortion system. Referring to fig. 2, fig. 2 is a flowchart of a data acquisition method according to an embodiment of the present application. The method comprises the following steps:
s100: and adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected.
The adjusting step can be triggered manually by an enable switch, or can be started automatically after the downlink is electrified. The instantaneous power of the downstream digital signal refers to the power absorbed instantaneously by the circuit in physics, and the magnitude of the power is equal to the product of instantaneous values of the instantaneous voltage and current. The instantaneous power is the distortion of the voltage and current waveforms relative to a standard sine wave caused by nonlinear load in a circuit. The digital signal to be detected is a signal before formal detection starts after power-on is started, and the peak power threshold value of the digital signal to be detected is adjusted in real time according to the downlink instantaneous power to be detected in the period of time, so that the digital signal to be detected can be adjusted to be high or low.
S200: and after receiving the data acquisition request, detecting the instantaneous peak power of the downlink digital signal.
In this embodiment, after receiving the data acquisition request, the method performs formal detection of the instantaneous peak power of the digital signal, and also triggers the end of adjusting the peak power threshold, latches the current peak power threshold, and stores the peak power threshold for standby. In order to increase the acquisition speed of acquisition detection, the detection of the instantaneous peak power can be performed in a Field-Programmable Gate Array (FPAG).
And S300, when the instantaneous peak power exceeds the peak power threshold, acquiring a forward transmitting signal and a feedback receiving signal with the same length according to a preset time delay, wherein the preset time delay is set according to a downlink data rate.
And when the instantaneous peak power exceeds the latched peak power threshold value, triggering the FPGA to acquire data. In order to ensure that the maximum peak value is located at the middle position of the data acquisition sequence as much as possible and avoid the peak signal being cut off during data calibration, a preset time delay can be set according to the downlink data rate to delay data acquisition. The downlink data rate is set through the FPGA, and the preset delay is positively correlated with the downlink data rate, that is, when the data rate is higher, a larger delay should be set to ensure that the maximum peak value of the acquisition is in the middle of the data sequence, and when the data rate is lower, a smaller preset delay can be set relatively. For example, in the current 5G NR, the IF data rate is set at substantially 491.52m/s, which should set a larger delay in the 5G NR predistortion system than the conventional IF data rate of 368.64 m/s. The preset time delay may be expressed in the form of a clock pulse. In this embodiment, because the pre-distortion processing is performed point by point, the forward transmit data and the feedback data need to correspond to each other one by one, and therefore, the forward transmit signal and the feedback receive signal with the same length need to be captured when the data is captured.
After the Signal data acquisition is finished, the captured forward transmitting data and feedback data are transmitted back to a Digital Signal Processing (DSP) for Signal Processing, meanwhile, the adjustment enabling of the peak power threshold is opened, and the self-adaptive adjustment step of the peak power threshold is repeated. The DSP processing comprises data preprocessing such as data judgment, frequency offset elimination, time delay calibration, amplitude phase calibration and the like. And the data judgment is to ensure that the acquired data is reasonable, the forward transmission data judgment is to ensure that the digital domain is not saturated after the predistortion, and the feedback receiving data judgment is to ensure that the data of the feedback link is normal.
According to the peak data acquisition method, the peak power threshold of the instantaneous power of the downlink digital signal to be detected is adjusted in a self-adaptive mode, so that the instantaneous peak power of the downlink digital signal is detected after a data acquisition request is received, data exceeding the peak power threshold can be more stably and accurately captured for digital pre-distortion parameter estimation, the acquisition reliability of a pre-distortion system is effectively guaranteed, further, when the instantaneous peak power exceeds the peak power threshold, forward transmitting signals and feedback receiving signals with the same length are acquired in a delayed mode according to the downlink data rate, the maximum peak value of the acquired signals is located in the middle of an acquired data sequence, and the peak signals are prevented from being cut off during data calibration.
In this embodiment, as shown in fig. 3, fig. 3 is a schematic step-by-step flow chart of a data acquisition method provided in the embodiment of the present application. Before adjusting the peak power threshold of the instantaneous power of the downlink digital signal in step S100, the following operations are performed:
after the machine is powered on, the software and hardware initialization of the equipment and the configuration of the parameters of the digital predistortion system are carried out, wherein the parameter configuration comprises a peak power threshold value, a first counting threshold value used for successful counting of continuous exceeding threshold, a second counting threshold value used for failed counting of continuous exceeding threshold, and a first adjustment step and a second adjustment step used for adjusting the peak power threshold.
The hardware initialization of the device comprises the zero clearing operation of the over-threshold success counter and the over-threshold failure counter, and the software initialization of the device comprises an enabling switch for self-adaptively adjusting the threshold.
In an embodiment, as shown in fig. 2, the step S100 of adjusting the peak power threshold of the instantaneous power of the downlink digital signal further includes:
s110, detecting the instantaneous peak power of the downlink digital signal to be detected, and comparing the instantaneous peak power of the downlink digital signal to be detected with a peak power threshold.
The peak power threshold value is the peak power threshold initially configured after power-on, and the FPAG detects the instantaneous peak power of the downlink in real time and compares the instantaneous peak power with the configured peak power threshold.
And S120, when the number of times that the instantaneous peak power of the downlink digital signal to be detected continuously exceeds the peak power threshold reaches a first counting threshold value, correspondingly increasing the peak power threshold according to a first adjustment step.
And S130, when the number of times that the instantaneous peak power of the downlink digital signal to be detected is continuously lower than the peak power threshold reaches a second counting threshold set value, correspondingly reducing the peak power threshold according to a second adjustment step.
The first counter is incremented by 1 if the instantaneous peak power is greater than the peak power threshold, and the second counter is incremented by 1 if the instantaneous peak power is less than the peak power threshold. When the number of times of successful continuous threshold exceeding is larger than the first counting threshold value, the peak power threshold value of the default configuration is low, and the peak power threshold value needs to be increased according to the first adjustment step. When the number of times of continuous threshold exceeding failure is larger than the first counting threshold value, the peak power threshold value of the default configuration is higher, and the peak power threshold value needs to be reduced according to the second adjustment step. It should be noted that, the value of the counter needs to be counted continuously, and one of the first counter and the second counter must be set to 0, that is, after the first counter is switched to the second counter, the original count value of the first counter must be cleared, so as to start counting next time. For example, the first count threshold value is 5, the instantaneous peak power value has been continuously greater than the peak power threshold 4 times, i.e., the value of the first counter is 4, and the 5 th instantaneous peak power is less than the peak power threshold, the second value is increased by 1, and the value of the first counter is cleared.
In this embodiment, the first count threshold is smaller than the second count threshold, and the first adjustment step value is larger than the second adjustment step value. The priority scheme is that a first preset threshold value which is successful in exceeding the threshold takes a smaller value such as 4, a first adjusting step takes a larger value such as 1000, a second preset threshold value which is failed in exceeding the threshold takes a larger value such as 400, and a second adjusting step takes a smaller value such as 100, so that a peak power threshold for screening data is sensitive to a link large peak signal, the link large peak signal can be quickly pulled up when the link large peak signal is encountered, the link signal is slowly faded when the link small peak signal is encountered, the strong adaptability of the peak power threshold to the link signal is ensured, and the large peak signal is stably acquired.
The present application further provides a peak data sampling apparatus, as shown in fig. 4, fig. 4 is a schematic structural diagram of the data sampling apparatus provided in the embodiment of the present application. The data acquisition device comprises a power threshold adjustment module 10, a power detection module 20 and a data acquisition module 30. The power threshold adjusting module 10 is configured to adjust a peak power threshold of an instantaneous power of a downlink digital signal to be detected, the power detecting module 20 is configured to detect the instantaneous peak power of the downlink digital signal after receiving a data acquisition request, and the data acquiring module 30 is configured to acquire a forward transmission signal and a feedback reception signal having the same length according to a preset time delay set by a downlink data rate when the instantaneous peak power exceeds the peak power threshold.
In this embodiment, the power threshold adjustment module further includes a power comparison module 11, an over-threshold success counter 12, and an over-threshold failure counter 13, where the power comparison module 11 is configured to compare the instantaneous peak power of the downlink digital signal to be detected with a peak power threshold, the first counter 12 is configured to perform counting when the instantaneous peak power of the downlink digital signal to be detected is greater than the peak power threshold, and the second counter 13 is configured to perform counting when the instantaneous peak power of the downlink digital signal to be detected is less than the peak power threshold.
In addition, the data acquisition device in this embodiment corresponds to the data acquisition method described above, and therefore, the application of other embodiments of the data acquisition device is not described in detail here.
The present application also provides a non-volatile storage medium storing instructions/program data that, when executed, implement the data collection method provided by any of the above-described embodiments of the present application, and any non-conflicting combinations. The instructions/program data may form a program file, and the program file may be stored in a storage medium in the form of a software product, and a processor (processor) may execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, or terminal devices, such as a computer, a server, a mobile phone, and a tablet.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. A peak sampling method for a base station digital predistortion system, the method comprising:
adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected;
detecting the instantaneous peak power of a downlink digital signal after receiving a data acquisition request;
and when the instantaneous peak power exceeds the peak power threshold, acquiring a forward transmitting signal and a feedback receiving signal with the same length according to a preset time delay, wherein the preset time delay is set according to a downlink data rate.
2. The data acquisition method of claim 1 wherein the adjusting the peak power threshold of the instantaneous power of the downlink digital signal further comprises:
detecting the instantaneous peak power of the downlink digital signal to be detected, and comparing the instantaneous peak power of the downlink digital signal to be detected with the peak power threshold;
when the number of times that the instantaneous peak power of the downlink digital signal to be detected continuously exceeds the peak power threshold reaches a first counting threshold value, correspondingly increasing the peak power threshold according to a first adjustment step;
and when the number of times that the instantaneous peak power of the downlink digital signal to be detected is continuously lower than the peak power threshold reaches a second counting threshold value, correspondingly reducing the peak power threshold according to a second adjustment step.
3. The data acquisition method according to claim 2, wherein the first count threshold value is smaller than the second count threshold value.
4. A data acquisition method according to claim 2, characterized in that said first adjustment step value is greater than said second adjustment step value.
5. The data acquisition method according to claim 1, wherein the adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected further comprises:
writing the peak power threshold, the first counting threshold value, the second counting threshold value and the initialization configuration values of the first adjustment step and the second adjustment step;
and carrying out zero clearing operation on the counter.
6. The data acquisition method according to claim 1, wherein the detecting the instantaneous peak power of the downstream digital signal after receiving the data acquisition request further comprises:
stopping adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected, and latching the peak power threshold.
7. A peak acquisition device for a base station digital predistortion system, the acquisition device comprising:
the power threshold adjusting module is used for adjusting the peak power threshold of the instantaneous power of the downlink digital signal to be detected;
the power detection module is used for detecting the instantaneous peak power of the downlink digital signal after receiving the data acquisition request;
and the data acquisition module is used for acquiring the forward transmitting signal and the feedback receiving signal with the same length according to preset time delay when the instantaneous peak power exceeds the peak power threshold, wherein the preset time delay is set according to a downlink data rate.
8. The data acquisition device of claim 6 wherein the power threshold adjustment module is further configured to:
detecting the instantaneous peak power of the downlink digital signal to be detected, and comparing the instantaneous peak power of the downlink digital signal to be detected with the peak power threshold;
when the number of times that the instantaneous peak power of the downlink digital signal to be detected continuously exceeds the peak power threshold reaches a first counting threshold value, correspondingly increasing the peak power threshold according to a first adjustment step;
and when the number of times that the instantaneous peak power of the downlink digital signal to be detected is continuously lower than the peak power threshold reaches a second counting threshold set value, correspondingly reducing the peak power threshold according to a second adjustment step.
9. The data acquisition device according to claim 8, wherein the first count threshold value is smaller than the second count threshold value.
10. A non-volatile storage medium storing instructions which, when executed, implement the method of data acquisition of any one of claims 1-6.
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