WO2023246114A1

WO2023246114A1 - Power calibration method, wireless communication device and storage medium

Info

Publication number: WO2023246114A1
Application number: PCT/CN2023/074916
Authority: WO
Inventors: 黎辉勇
Original assignee: 中兴通讯股份有限公司
Priority date: 2022-06-21
Filing date: 2023-02-08
Publication date: 2023-12-28
Also published as: CN117318846A

Abstract

The present disclosure belongs to the field of power control. Provided are a power calibration method, a wireless communication device and a storage medium. The method comprises: acquiring the present drain electrode current of a power amplifier, and acquiring a target drain electrode current, wherein the target drain electrode current matches a target output power, to be calibrated, of the power amplifier; adjusting an adjustable gain of a radio frequency link according to the present drain electrode current and the target drain electrode current, so that the drain electrode current of the power amplifier changes along with the adjustment of the adjustable gain, and the changed drain electrode current matches the target drain electrode current; and determining a fixed gain of the radio frequency link according to the target output power and the adjusted adjustable gain.

Description

Power calibration method, wireless communication equipment and storage medium

Cross-references to related applications

This disclosure claims priority to Chinese patent application CN202210706857.

Technical field

The present disclosure relates to the field of power control technology, and in particular, to a power calibration method, wireless communication device and storage medium.

Background technique

In wireless communication systems, power control technology is of very important significance. The transmit power of wireless communication equipment directly affects the use effect of wireless communication equipment. For example, if the power of wireless communication equipment is too small, the communication coverage will be reduced. If the power of wireless communication equipment is too high, the wireless communication equipment will consume excessive power and cause interference. communication in the community, and there are problems such as shortening the life of wireless communication equipment. Therefore, wireless communication equipment must undergo transmission power calibration before leaving the factory. However, the current power calibration method of wireless communication equipment is basically the traditional instrument calibration method, which requires the use of a spectrum analyzer or power meter to calibrate the transmit power of the wireless communication equipment and write the relevant calibration parameters. This power calibration method has high environmental requirements and requires external radio frequency instruments. It is easy to introduce technical problems such as inaccurate line loss, instrument center deviation, large wiring errors, and unstable complex fixtures.

Contents of the invention

The present disclosure provides a power calibration method, wireless communication equipment and storage medium, aiming to solve technical problems such as inaccurate line loss, instrument center deviation, large wiring errors, and unstable complex fixtures.

In a first aspect, the present disclosure provides a power calibration method, which includes: obtaining the current drain current of a power amplifier, and obtaining a target drain current, wherein the target drain current matches the target output power of the power amplifier to be calibrated; according to the current Drain current and target drain current, adjust the adjustable gain of the radio frequency link, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and make the changed drain current consistent with the target drain current Matching; determine the fixed gain of the RF link based on the target output power and the adjusted adjustable gain.

In a second aspect, the present disclosure also provides a wireless communication device, including a power amplifier, a processor, a memory, a computer program stored on the memory and executable by the processor, and data for realizing connection communication between the processor and the memory. A bus, wherein the computer program, when executed by a processor, implements the steps of any power scaling method provided by the present disclosure.

In a third aspect, the present disclosure also provides a storage medium for computer-readable storage. The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the present disclosure. Provides steps for any of the power scaling methods.

Description of the drawings

Figure 1 is a schematic flow chart of the steps of a power calibration method provided by the present disclosure;

Figure 2 is a schematic structural diagram of the power amplifier provided by the present disclosure;

Figure 3 is a schematic structural diagram of a base station provided by the present disclosure;

Figure 4 is a schematic flowchart of the sub-steps of the power calibration method in Figure 1;

Figure 5 is a schematic flowchart of the steps of another power calibration method provided by the present disclosure;

Figure 6 is another schematic structural diagram of a base station provided by the present disclosure;

Figure 7 is a schematic structural block diagram of a wireless communication device provided by the present disclosure.

Detailed ways

The technical solutions in this disclosure will be clearly and completely described below with reference to the accompanying drawings in this disclosure. Obviously, the described embodiments are part of the embodiments of this disclosure, rather than all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this disclosure.

The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all contents and operations/steps, nor are they necessarily performed in the order described. For example, some operations/steps can also be decomposed, combined or partially merged, so the actual order of execution may change according to actual conditions.

It should be understood that the terminology used in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

The present disclosure provides a power calibration method, wireless communication equipment and storage medium, aiming to solve technical problems such as inaccurate line loss, instrument center deviation, large wiring errors, and unstable complex fixtures, and significantly reduce the cost of power calibration. Environmental requirements, no need for external RF instruments, and can eliminate measurement errors caused by RF instruments, line losses, fixtures and other factors.

The present disclosure provides a power calibration method, wireless communication device and storage medium. Among them, the power calibration method can be applied to wireless communication devices equipped with power amplifiers. The wireless communication devices can be electronic devices such as mobile phones, tablet computers, notebook computers, desktop computers, personal digital assistants, and wearable devices. The wireless communication device can also be a base station, such as an active antenna unit (Active Antenna Unit, AAU) and a radio remote unit (Radio Remote Unit, RRU), all base stations that include power amplifiers.

In the field of power control of wireless communication equipment, the traditional instrument calibration method requires a spectrum analyzer or power meter to calibrate the transmit power of the wireless communication equipment and write the relevant calibration parameters. However, this traditional method will introduce many environmental errors, such as inaccurate line loss, instrument center deviation, large wiring errors, and unstable complex fixtures, which will lead to problems such as high retest rates. At the same time, 5G AAU base stations are currently developing towards minimalist models with integrated single-board antennas. This model uses no radio frequency interface for traditional instrument calibration methods. Therefore, how to implement a base station power calibration method that requires no radio frequency instruments and has low environmental requirements has become an urgent problem that needs to be solved.

Based on this, the present disclosure provides a power calibration method that has low requirements on the calibration environment and does not require radio frequency instruments. It not only overcomes the shortcomings of the traditional instrument calibration method that has high requirements on the calibration environment, but also solves the problem that the 5G AAU single-board antenna integrated minimalist model suffers from the problem of transmit power calibration without a radio frequency interface for the traditional instrument calibration method. At the same time, since the radio frequency instrument is omitted, the production cost can also be reduced.

The present disclosure can be applied to the production and testing process of wireless communication equipment. During application, the power transmission port of the wireless communication equipment must be connected to a matching load or antenna to ensure radiation safety. The wireless communication equipment itself must have the ability to detect the drain current of the power amplifier. For example, a current detection circuit is installed on the drain side of the power amplifier to collect the drain current of the power amplifier. Since the power amplifier efficiency is related to the type of power amplifier and the working static state, drain voltage, output power, operating temperature, and output characteristics of the power amplifier tube, it must be ensured that the power amplifier used in the laboratory and the power amplifier used for production calibration are of the same power amplifier type and the same The working static point (the power amplifier tube is adjusted to the same target static point by adjusting the gate voltage in advance), the same drain voltage, the same drain current (when other parameters are the same, the output power will be the same if the drain current is the same), ±5℃ The operating temperature within the error and the same manufacturer (the type and manufacturing process of the power amplifier tube directly determine the output characteristic curve between its drain current and drain voltage).

Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, taking the application of the power calibration method to a base station as an example. The following embodiments and features in the embodiments may be combined with each other without conflict. Similarly, this power calibration method can also be applied to other wireless communication devices.

Please refer to FIG. 1 , which is a schematic flow chart of a power calibration method provided by the present disclosure.

As shown in Figure 1, the power calibration method includes steps S101 to S103.

Step S101: Obtain the current drain current of the power amplifier and obtain the target drain current, where the target drain current matches the target output power of the power amplifier to be calibrated.

Among them, there is a corresponding relationship between the output power of the power amplifier and the drain current of the power amplifier. The corresponding relationship between the drain current and the output power needs to be obtained in advance in the laboratory using a radio frequency instrument. For example, obtain the corresponding power amplifier output power under multiple drain currents in the laboratory, and then use linear regression or polynomial regression to obtain the relationship curve or expression between the drain current and the power amplifier output power.

It should be noted that the target output power to be calibrated is determined based on the use effect of the base station in the field, and the target drain current of the power amplifier is detected when the output power of the power amplifier is the target output power. Therefore, the matching target drain current can be determined according to the target output power to be calibrated.

In an exemplary embodiment, as shown in Figure 2, the power amplifier 10 includes a power amplifier tube and a circulator. The power supply supplies power to the power amplifier tube through a current detection circuit. The current detection circuit is used to detect the drain voltage U and drain current of the power amplifier 10. I. The power amplifier output power P satisfies the following expression:
P＝10*log ₁₀ (U*I*μ)+10*log ₁₀ D

Among them, I represents the drain current, U represents the drain voltage of the power amplifier, μ represents the power amplifier efficiency, D represents the loss factor of the circulator, and 10*log10D represents the circulator insertion loss. Among them, the circulator insertion loss 10*log ₁₀ D is fixed; the drain voltage U can be set directly during the power calibration process; for the same power amplifier, under the same conditions, the power amplifier efficiency μ is fixed. Therefore, as long as it is detected that the drain current I of the power amplifier reaches the target drain current, it can be predicted that the output power P has reached the target output power.

In one embodiment, the target output power to be calibrated is determined by: detecting the output power of multiple power amplifiers when the drain current reaches the target current value, and obtaining the output power of the multiple power amplifiers; Sort, and select multiple candidate output powers from multiple output powers according to the sorting results; average the multiple candidate output powers to obtain the target output power of the power amplifier to be calibrated. It should be noted that multiple power amplifiers can be of the same type of power amplifier product, and multiple candidate output powers can be selected according to a preset range or a preset number. Sort and select the output powers of multiple power amplifiers when their drain current reaches the target current value, and average the selected candidate output powers to obtain the target output power, which can ensure the representativeness of the target output power. It is beneficial to improve the accuracy of subsequent power calibration.

In an exemplary embodiment, as shown in FIG. 3 , the signal source 40 outputs a transmission signal to the power amplifier 10 , and the channel between the signal source 40 and the power amplifier 10 is a radio frequency link. After the transmit signal reaches the power amplifier 10 through the radio frequency link, the power amplifier 10 outputs the transmit signal to the load 30 through the power meter 20. The power supply 50 is used for power supply, the ammeter 60 is used to monitor the drain current of the power amplifier 10, and the voltmeter 70 is used to monitor the power amplifier. drain voltage of 10. The signal source 40 adjusts the output of the signal source from small to large, so that the drain current I of the power amplifier reaches the target drain current _In . At this time, the actual output power P of the power amplifier can be read through the power meter 20 . Based on this, n power amplifiers of the same model were tested, and the actual output powers P ₀ ~ P _n-1 of the n power amplifiers were obtained, n≧20. Sort the actual output powers P ₀ ~ P _n-1 of n power amplifiers from small to large, and take the middle 80% of the sorted results to get the average output power P _aver . P _aver is the relationship between this type of power amplifier and the target drain current I _n The corresponding target output power P _n .

In one embodiment, the current drain current includes a first drain current and a second drain current, wherein the first drain current is the drain current of the power amplifier detected at the first adjustable gain of the radio frequency link. ; The second drain current is the drain current of the power amplifier detected under the second adjustable gain of the radio frequency link; the second adjustable gain may be determined based on the first adjustable gain, for example, the second adjustable gain is The sum of the first adjustable gain and the preset gain, and the preset gain is, for example, 2dB or -2dB.

In one embodiment, obtaining the current drain current of the power amplifier includes: obtaining the first adjustable gain, and setting the adjustable gain of the radio frequency link to the first adjustable gain to obtain the power amplifier under the first adjustable gain. the first drain current; determine the second adjustable gain according to the first adjustable gain, and set the adjustable gain of the radio frequency link to the second adjustable gain to obtain the second adjustable gain of the power amplifier under the second adjustable gain drain current. The second drain current or the first drain current can be used as the current drain current of the power amplifier. By collecting the first drain current and the second drain current, it is helpful to improve the accuracy of subsequent power calibration.

In an exemplary embodiment, the preset adjustable range of the adjustable gain ATT _TX of the radio frequency link is [ATT _MIN , ATT _MAX ]. The preset adjustable range can be determined according to the working performance of the radio frequency link; set The first adjustable gain of the radio frequency link is ATT _TX1 = (ATT _MIN +ATT _MAX )/2; read the first drain current of the power amplifier under the first adjustable gain ATT _TX1 and record it as AD ₁ ; set the radio frequency The second adjustable gain of the link is ATT _TX2 = ATT _TX1 +2dB, where 2dB is the preset gain. The preset gain can be set according to the actual situation; read the second adjustable gain of the power amplifier under ATT _TX2 . The drain current is denoted as AD ₂ , and the second drain current AD ₂ is used as the current drain current.

Step S102: Adjust the adjustable gain of the radio frequency link according to the current drain current and the target drain current, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the changed drain current is equal to target drain current.

It should be noted that the power calibration process needs to determine whether the power amplifier output power has reached the target output power based on the detected current drain current. For example, when the current difference between the current drain current and the target drain current of the power amplifier is less than or equal to the preset current difference, it can be determined that the current drain current matches the target drain current. At this time, the output power of the power amplifier output power for the target.

It should be noted that the number of adjustments to the adjustable gain of the radio frequency link may be one or multiple times. By adjusting the adjustable gain of the RF link, the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the current difference between the changed drain current and the target drain current becomes smaller and smaller. The closer it is to zero, so that the changed drain current matches the target drain current, and power calibration can be performed at this time.

In an embodiment, as shown in Figure 4, step S102 includes: sub-steps S1021 to sub-step S1022.

Sub-step S1021: Determine the target adjustable gain of the radio frequency link based on the current drain current and the target drain current.

It should be noted that before adjusting the adjustable gain of the radio frequency link, the target adjustable gain of the radio frequency link can be determined based on the current drain current and the target drain current. Among them, there can be many ways to determine the target adjustable gain of the radio frequency link, including linear method and closed-loop control method. Closed-loop control method such as step method, PID (Proportion Integral Differential, proportion-integral-derivative) method, bisection method wait.

In one embodiment, after determining the target adjustable gain of the radio frequency link, it is determined whether the target adjustable gain ATT _TXX is greater than the preset maximum adjustable gain ATT _MAX ; if the target adjustable gain ATT _TXX is greater than the preset maximum adjustable gain If the gain ATT _MAX is determined to be a closed loop failure, exit the step of determining the target adjustable gain; if the target adjustable gain ATT _TXX is less than or equal to the preset maximum adjustable gain ATT _MAX , execute the next sub-step.

Sub-step S1022: Adjust the adjustable gain of the radio frequency link according to the target adjustable gain.

In one embodiment, the method of adjusting the adjustable gain of the radio frequency link according to the target adjustable gain is: setting the adjustable gain of the radio frequency link to the target adjustable gain. In another embodiment, the method of adjusting the adjustable gain of the radio frequency link according to the target adjustable gain is: modifying the target adjustable gain according to the preset parameters, and setting the adjustable gain of the radio frequency link to Corrected target adjustable gain.

The following uses the linear method as an example to illustrate an implementation method for determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current.

In one embodiment, determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current includes: based on the first adjustable gain, the first drain current, the second adjustable gain and the second Drain current, obtain the first relationship parameter, which is used to characterize the linear relationship between the adjustable gain and the drain current; determine the target adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current . Wherein, the current drain current includes a first drain current or a second drain current. The first drain current is obtained at the first adjustable gain of the power amplifier, and the second drain current is obtained at the second adjustable gain of the power amplifier. Obtained by adjusting the gain. It should be noted that according to the linear relationship between the adjustable gain and the drain current, the target adjustable gain corresponding to the target drain current can be accurately determined.

Wherein, the method of obtaining the first relationship parameter includes: calculating the first difference between the first adjustable gain and the second adjustable gain, and calculating the second difference between the first drain current and the second drain current. value; determined based on the first difference and the second difference The first slope between the adjustable gain and the drain current; according to the first slope, the second drain current and the second adjustable gain, the first intercept is obtained; the first slope and the first intercept are used as the first relationship parameter. It should be noted that the first difference and the second difference may be absolute values, that is, the first difference may be the absolute value of the difference between the first adjustable gain and the second adjustable gain, and the second difference It may be the absolute value of the difference between the first drain current and the second drain current, and the first slope and the first intercept as the first relationship parameters may be positive values or negative values.

In an exemplary embodiment, the first difference between the first adjustable gain ATT _TX1 and the second adjustable gain ATT _TX2 is ATT _TX2 -ATT _TX1 , and the first drain current AD ₁ and the second drain current The second difference between AD ₂ is AD ₂ -AD ₁ . Therefore, the first slope k=(ATT _TX2 -ATT _TX1 )/(AD ₂ -AD ₁ ), and the first intercept b=ATT _TX2 -k*AD ₂ .

It should be noted that if the adjustable gain of the radio frequency link is to be adjusted multiple times, after calculating the first slope and the first intercept, determine whether the first slope k is zero, and determine the first drain current AD ₁ is equal to the second drain current AD ₂ ; if it is judged that the first slope k=0, or the second drain current AD ₂ is equal to the first drain current AD ₁ , then discard the k and b parameters calculated this time, The k and b parameters obtained from the last adjustment are used.

Among them, determining the target adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current includes: determining the third adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current; The adjustable gain of the circuit is set to the third adjustable gain, and the third drain current of the power amplifier under the third adjustable gain is detected; the difference between the third drain current and the target drain current is less than or equal to the preset When setting the difference value, the third adjustable gain is used as the target adjustable gain of the radio frequency link. The difference between the third drain current and the target drain current can be an absolute value, and the preset difference can be set according to actual conditions. For example, when the absolute value of the difference between the third drain current and the target drain current is less than or equal to the preset difference, it is determined that the third drain current matches the target drain current.

In an exemplary embodiment, the target drain current is A _G and the third adjustable gain of the radio frequency link is ATT _TX3 =k*AD _G +b; the adjustable gain of the radio frequency link is set to the third adjustable gain Gain ATT _TX3 _, and detect the third drain current AD _X of the power amplifier under the _third adjustable gain ATT _TX3 ; calculate the difference between the third drain current _AD -AD _G ; when the absolute value |△ _AD | of the difference between the _third _drain current AD The third drain current AD _X matches the target drain current AD _G. At this time, the third adjustable gain ATT _TX3 is the target adjustable gain ATT _TXX of the radio frequency link.

In one embodiment, determining the third adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current includes: calculating the fourth adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current. Gain; calculate the gain difference between the fourth adjustable gain and the second adjustable gain; when the gain difference is less than or equal to the preset maximum adjustable step, determine the fourth adjustable gain as the third adjustable gain Gain; when the gain difference is greater than the maximum adjustable step, the sum of the second adjustable gain and the maximum adjustable step is determined as the third adjustable gain. Among them, the maximum adjustable step can be set according to the actual situation, and the calculation method of the fourth adjustable gain ATT _TX4 can be ATT _TX4 =k*AD _G +b.

In an exemplary embodiment, the maximum adjustable step is STEP _MAX . If the gain difference between the fourth adjustable gain and the second adjustable gain ATT _TX4 -ATT _TX2 ≤ STEP _MAX , then let the third adjustable gain Gain ATT _TX3 = ATT _TX4 . If the gain difference between the fourth adjustable gain and the second adjustable gain ATT _TX4 -ATT _TX2 >STEP _MAX , then let the third adjustable gain ATT _TX3 =ATT _TX2 +STEP _MAX .

In an exemplary embodiment, after detecting the third drain current of the power amplifier under the third adjustable gain, the method further includes: when the difference between the third drain current and the target drain current is greater than a preset difference. , the second adjustable gain as the new first adjustable gain and the third adjustable gain as the new second adjustable gain, the second drain current as the new first drain current and the third The drain current is used as a new second drain current to perform the step of obtaining the first relationship parameter according to the first adjustable gain, the first drain current, the second adjustable gain and the second drain current.

In one embodiment, the power amplifier temperature _PAT is read through the temperature detection device. If the power amplifier temperature _PAT is not within the preset temperature range [T _MIN , T _MAX ], the power amplifier is judged to be over-temperature, and the step of determining the target adjustable gain is exited. . The preset temperature range is the operating temperature range of the power amplifier allowed during the calibration process.

In one embodiment, after detecting the third drain current of the power amplifier under the third adjustable gain, the method further includes: When the difference between the current and the target drain current is greater than the preset difference, the value of the first adjustable gain is the value of the second adjustable gain, and the value of the second adjustable gain is the value of the third adjustable gain. , and let the value of the first drain current be the value of the second drain current, and the value of the second drain current be the value of the third drain current, so as to return to the execution according to the first adjustable gain, the first drain current , the second adjustable gain and the second drain current, the step of obtaining the first relationship parameter.

In an exemplary embodiment, the preset difference value is E _AD . If the preset difference value |ΔAD|>E _AD , then let the first adjustable gain ATT _TX1 = the second adjustable gain ATT TX2 , and the second adjustable gain ATT _TX2 . Adjust the gain ATT _TX2 = the third adjustable gain ATT _TXX ; and let the first drain current AD ₁ = the second drain current AD ₂ , the second drain current AD ₂ = the third drain current AD _X , and return to execution Steps to calculate slope k=(ATT _TX2 -ATT _TX1 )/(AD ₂ -AD ₁ ); b=ATT _TX2 -k*AD ₂ .

In one embodiment, a maximum number of cycles is set to return to the step of obtaining the first relationship parameter based on the first adjustable gain, the first drain current, the second adjustable gain, and the second drain current. It should be noted that when it is determined that the number of loops returned for execution is greater than or equal to the maximum number of loops, it is determined that the closed loop fails, and the step of determining the target adjustable gain is exited. Avoid infinite loops by controlling the number of loops.

Step S103: Determine the fixed gain of the radio frequency link based on the target output power and the adjusted adjustable gain.

It should be noted that when the changed drain current matches the target drain current, it indicates that the output power of the power amplifier reaches the target output power. At this time, the radio frequency link can be determined based on the target output power and the adjusted adjustable gain. Fixed gain to accurately achieve power calibration. The output power of the power amplifier is indirectly detected through the drain current of the power amplifier to reach the target output power, so that the fixed gain of the RF link can be calculated based on the target output power and the adjusted adjustable gain to achieve power calibration without the need for an external RF instrument. The current power calibration method relies on environmental factors such as radio frequency instruments, line losses, and fixtures, eliminating the measurement errors introduced by them.

In one embodiment, the radio frequency link includes a transmit link; determining the fixed gain of the radio frequency link according to the target output power and the adjusted adjustable gain includes: obtaining the transmit digital power of the transmit link corresponding to the target output power; Obtain the filter gain corresponding to the transmit signal frequency of the transmit link; calculate the fixed gain of the transmit link based on the target output power, transmit digital power, filter gain and adjusted adjustable gain. Among them, the fixed gain of the transmitting link can be called the output fixed gain of the transmitting link. It should be noted that the fixed gain of the transmitting link is calculated through the above method to achieve power calibration. No external radio frequency instrument is needed, and the power calibration environment is improved. It has lower requirements and good stability, which is very conducive to the production control process. At the same time, it can reduce production costs by eliminating the need for radio frequency instruments.

In an exemplary embodiment, the fixed gain of the transmit link is calculated using the following expression:
GAIN _TX ＝P+GAIN _filter -TSSI-ATT _TXX

Among them, GAIN _TX represents the fixed gain of the transmit link, P represents the target output power, TSSI represents the transmit digital power of the transmit link, ATT _TXX represents the adjusted adjustable gain (the adjustable gain of the transmit link), and GAIN _filter represents Filter gain (the gain of the filter at the frequency of the transmitted signal). The transmit digital power TSSI and the adjustable gain ATT _TXX of the transmit link can be read directly from inside the base station. The GAIN _filter can be tested in advance using a vector network analyzer, and the output power P is indirectly predicted by detecting the drain current of the power amplifier.

In one embodiment, the radio frequency link also includes a feedback link; obtaining the feedback digital power of the feedback link corresponding to the target output power; obtaining the preset adjustable gain of the feedback link; according to the feedback digital power, target output power, Filter gain and the adjustable gain of the feedback link, calculate the fixed gain of the feedback link. Among them, the fixed gain of the feedback link can be called the feedback fixed gain of the feedback link. It should be noted that the fixed gain of the feedback link is calculated through the above method to achieve power calibration. No external radio frequency instrument is needed, and the power calibration environment is improved. It has lower requirements and good stability, which is very conducive to the production control process and can further reduce production costs.

In an exemplary embodiment, the fixed gain of the feedback link is calculated using the following expression:
GAIN _FB =FBSSI-(P+GAIN _filter )-ATT _FB

Among them, GAIN _FB represents the fixed gain of the feedback link, FBSSI represents the feedback digital power, and ATT _FB represents the feedback chain The adjustable gain of the path, P represents the target output power, and GAIN _filter represents the filter gain. The feedback digital power FBSSI and the feedback link adjustable gain ATT _FB can be read directly from inside the base station.

It can be understood that for other wireless communication devices other than base stations, the methods of determining the fixed gain of the radio frequency link may be different. For example, the parameters for calculating the fixed gain of the transmission link or the fixed gain of the feedback link may be different. This article The embodiment does not specifically limit this.

In one embodiment, power calibration needs to be performed under multiple transmit signal frequencies, that is, fixed gains of the radio frequency link under multiple transmit signal frequencies need to be determined. The transmit signal frequencies correspond to the fixed gains of the radio frequency links one-to-one. Therefore, both the fixed gain of the transmitting link and the fixed gain of the feedback link can be gains corresponding to each transmitting signal frequency.

In an exemplary embodiment, the frequency range of the radio frequency signal is [f ₀ , f _n-1 ]. When adjusting the adjustable gain of the RF link based on the current drain current and the target drain current, set the transmit signal of the RF link to a single tone signal at frequency f ₀ to obtain the RF chain at the transmit signal frequency f ₀ The fixed gain GAIN ₀ of the radio frequency link; then set the transmit signal of the radio frequency link to a single tone signal of frequency f ₁ to obtain the fixed gain GAIN ₁ of the radio frequency link at the transmit signal frequency f ₁ ; ...; finally set the radio frequency link The transmitted signal is a single tone signal with frequency f _n-1 , and the fixed gain GAIN _n-1 of the radio frequency link at the frequency f _n-1 of the transmitted signal is obtained.

The power calibration method provided by the above embodiments obtains the current drain current of the power amplifier and obtains the target drain current, where the target drain current matches the target output power of the power amplifier to be calibrated; according to the current drain current and the target Drain current, adjust the adjustable gain of the RF link, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and make the changed drain current match the target drain current; according to the target output power and adjusted adjustable gain to determine the fixed gain of the RF link. This disclosure indirectly detects the output power of the power amplifier through the drain current of the power amplifier, thereby calculating the fixed gain of the radio frequency link to achieve power calibration. There is no need for external radio frequency instruments, and the current power calibration method eliminates the burden on radio frequency instruments, line losses, fixtures, etc. The dependence on environmental factors eliminates the measurement errors introduced by them. Therefore, the requirements for the power calibration environment are low and the stability is good, which is very conducive to the production control process. At the same time, because the radio frequency instrument is omitted, the production cost can be reduced.

It should be noted that in the process of determining the fixed gain of the radio frequency link, since the transmit digital power TSSI, the adjustable gain ATT _TXX of the transmit link, the feedback digital power FBSSI, and the adjustable gain ATT _FB of the feedback link can all be directly It is read from inside the base station. Therefore, the calibration error caused by the power calibration method provided by this disclosure mainly comes from P+GAIN _filter , as can be seen from the following expression:

Among them, I represents the drain current, U represents the drain voltage of the power amplifier, μ represents the power amplifier efficiency, and D represents the loss factor of the circulator. ΔP represents the error caused by the power amplifier output power, ΔU represents the error caused by the drain voltage, ΔI represents the error caused by the drain current, Δμ represents the error caused by the power amplifier efficiency, and ΔD represents the error caused by the circulator insertion loss. ΔGAIN _filter represents the error caused by the filter, ΔGAIN _TX represents the error caused by the fixed gain of the transmit link, and ΔGAIN _FB represents the error caused by the fixed gain of the feedback link.

Firstly, the error caused by the drain voltage U: depends on the voltage measurement accuracy of the electronic load used for base station power amplifier drain voltage calibration. The electronic load voltage measurement accuracy is generally 0.025%, which brings a huge impact on the power amplifier output power. The error is about 0.001dB. Secondly, the error caused by the drain current I: depends on the accuracy of the electronic load current measurement used for base station power amplifier drain current calibration. The accuracy of the electronic load current measurement is generally 0.1%, which brings to the power amplifier output power. The error is about 0.004dB. The third aspect is the error caused by the insertion loss of the power amplifier circulator: it depends on the consistency of the manufacturer's incoming materials. The insertion loss itself is relatively small <0.25dB. Therefore, even the error caused by batch incoming materials can be guaranteed to be <0.1dB. The fourth aspect is the error caused by the power amplifier efficiency μ: there are many influencing factors, but as long as the above conditions are met, the discreteness of the power amplifier efficiency is less than 10%. The error brought to the output power of the power amplifier is <0.457dB. Therefore, the power calibration method provided by the present disclosure has a mass production calibration error of <0.662dB.

The errors of traditional instrument calibration methods include radio frequency instrument errors, line loss errors, and wiring errors. Currently commonly used instrument calibration methods include power meter calibration and spectrum analyzer calibration. Ideally, for the power meter calibration method: the power meter error is <0.2dB, the line loss error comes from the vector network analyzer measurement error of calibrating the line loss <0.1dB, the wiring error of batch operation is <0.2dB, and the total error is <0.5 dB. For the spectrum analyzer calibration method: the spectrum analyzer error is <0.5dB, the line loss error comes from the vector network analyzer measurement error of calibrating the line loss <0.1dB and the attenuator (larger base station power requires the use of high-power attenuators, tooling boards or Coupler) uncertainty <0.2dB, batch operation wiring error <0.2dB, total error <1.0dB.

Compared with the calibration error of the traditional instrument calibration method, the power calibration method provided by the present disclosure is slightly higher than the power meter calibration method and much lower than the spectrum analyzer calibration method. Therefore, it can meet the batch testing requirements of production. However, the errors caused by environmental factors introduced by traditional instrument calibration methods are large, so the calibration errors during mass production are often much larger than the calibration errors caused by the power calibration method provided by the present disclosure. Therefore, in the mass production process, the power calibration method provided by the present disclosure has smaller measurement errors than the traditional instrument calibration method, eliminating the dependence on environmental factors such as radio frequency instruments, line losses, and fixtures, and improving the power calibration environment. It has low requirements and good stability, which is very conducive to the production control process.

Please refer to FIG. 5 , which is a schematic flow chart of another power calibration method provided by the present disclosure.

As shown in Figure 5, the power calibration method includes steps S201 to S204.

Step S201: Obtain the current drain current of the power amplifier and obtain a second relationship parameter. The second relationship parameter is used to characterize the linear relationship between the current value of the drain current and the AD value.

Wherein, the current drain current of the power amplifier may be the current AD value A _d detected by the power amplifier drain detection circuit, and the second relationship parameter may be the second intercept and the second intercept between the current value and the AD value. The AD value of the drain current is the value obtained by AD conversion of the current value. For example, the AD value of the drain current is the value obtained by AD (analog-digital) conversion of the current signal at the drain of the power amplifier, thereby converting the analog value into The current value is converted into a digital value.

In one embodiment, the drain current of the power amplifier is set to a first current value and a second current value respectively to detect the first AD value corresponding to the first current value and the second AD value corresponding to the second current value; calculate the The AD difference between the first AD value and the second AD value, and calculate the current difference between the first current value and the second current value; based on the AD difference and the current difference, determine the difference between the current value and the AD value the second slope; according to the second slope, the second AD value and the second current value, the second intercept is obtained; the second slope and the second intercept are used as the second relationship parameter. It should be noted that according to the linear relationship between the current value of the drain current and the AD value, the first AD value corresponding to the first current value and the second AD value corresponding to the second current value can be accurately determined, which is beneficial to Improve the accuracy of subsequent power calibration.

In an exemplary embodiment, as shown in Figure 6, the power supply is used to supply power to the load and the power amplifier. When the power is turned off, the power amplifier is turned off and the load is in open circuit mode. When the power is turned on, the power amplifier is turned on and the load is in constant current mode. If the power amplifier is turned off, the grid voltage of the power amplifier tube is cleared, and the load is set to open circuit mode, the digital signal processing (DSP) chip can read the AD value A ₀ detected by the current detection circuit at this time. If the power amplifier is turned on, set the load to constant current mode, and set the drain current to the first current value. The first current value can be the minimum target current value I _min . Read the first AD value A detected by the current detection circuit at this time. ₁ . Set the drain current to a preset second current value, the second current value may be the target current maximum value I _max , and read the second AD value A ₂ detected by the current detection circuit at this time. The AD difference between the first AD value and the second AD value is A ₂ -A ₁ , the current difference between the first current value and the second current value is I _max -I _min , the sum of the current value and the AD value The second slope between is w=(A ₂ -A ₁ )/(I _max -I _min ), and the second intercept is d=A ₂ -w*I _max .

Step S202: Determine the target AD value corresponding to the target current value according to the second relationship parameter, and use the target AD value as the target drain current. The target drain current matches the target output power of the power amplifier to be calibrated.

Among them, the target current value I _n corresponds to the transmission signal frequency f _n of the transmission link, the target current value corresponding to the current transmission signal frequency is obtained, and the target AD value corresponding to the target current value is determined according to the second relationship parameter to obtain the target leakage Extreme current.

In one embodiment, a target current value corresponding to the transmit signal frequency of the radio frequency link is obtained; a product value between the target current value and the second slope is calculated; and the target current value is obtained based on the sum of the product value and the second intercept. The corresponding target AD value. In an exemplary embodiment, the target AD value corresponding to the target current value is determined by the following expression: AD _G =w*I _n +d, where In, AD _G represents the target AD value, w represents the second slope, _In represents the target current value corresponding to the frequency of the transmitted signal, and d represents the second intercept. Different transmit signal frequencies correspond to different target current values. The corresponding relationship between the transmit signal frequency and the target current value can be obtained through laboratory comparison in advance.

In one embodiment, obtaining the target AD value corresponding to the target current value based on the sum of the product value and the second intercept includes: obtaining the standard AD value of the drain current when the power amplifier is turned off at a standard temperature, and obtaining the current temperature Calculate the third AD value of the drain current when the power amplifier is turned off; calculate the target difference between the standard AD value and the third AD value; calculate the sum of the product value, the second intercept and the target difference to obtain the target AD value. It should be noted that the standard AD value can be obtained and saved in advance through the laboratory. The target AD value is obtained by calculating the sum of the target difference, product value, and second intercept between the corresponding standard AD value and the third AD value at the standard temperature, which can eliminate the influence of temperature drift and improve the accuracy of power calibration.

In an exemplary embodiment, the target AD value corresponding to the target current value is determined by the following expression: AD _G =w* _In +d+(A _d -A ₀ ). Among them, AD _G represents the target AD value, w represents the second slope, _In represents the target current value, d represents the second intercept, A _d represents the third AD value, and A ₀ represents the standard AD value. The target difference between the standard AD value and the third AD value is A _d -A ₀ . This target difference can represent the influence of temperature drift caused by the drain circuit of the power amplifier.

Step S203: Adjust the adjustable gain of the radio frequency link according to the current drain current and the target drain current, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the changed drain current is equal to target drain current.

Among them, the number of adjustments to the adjustable gain of the radio frequency link can be one or more times. By adjusting the adjustable gain of the radio frequency link multiple times, the difference between the changed drain current and the target drain current will be achieved. The current difference is getting closer and closer to zero. It should be noted that matching the changed drain current with the target drain current includes: the current difference between the changed drain current and the target drain current is less than or equal to the preset current difference. When the changed drain current matches the target drain current, it can be determined that the output power of the power amplifier has reached the target output power. At this time, the power calibration can be accurately performed to obtain the fixed gain of the radio frequency link.

In one embodiment, the target adjustable gain of the radio frequency link is determined based on the current drain current and the target drain current; and the adjustable gain of the radio frequency link is adjusted based on the target adjustable gain. Among them, there can be many ways to determine the target adjustable gain of the radio frequency link. For example, the closed-loop control method includes the step method, the PID method, the dichotomy method, etc. After determining the target adjustable gain of the radio frequency link, the adjustable gain of the radio frequency link is set to the target adjustable gain so that the drain current of the power amplifier at the target adjustable gain matches the target drain current.

The following uses the PID method as an example to illustrate an implementation method for determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current.

In one embodiment, determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current includes: calculating an error value between the current drain current and the target drain current; Set the PID expression to determine the offset parameter of the adjustable gain of the radio frequency link; according to the offset parameter, determine the target adjustable gain of the radio frequency link. It should be noted that the PID algorithm is a control algorithm that combines proportional, integral and differential links. It realizes the closed-loop adjustment of the adjustable gain of the radio frequency link through the preset PID expression, and can accurately control the changed drain current. matches the target drain current.

Among them, the preset proportional coefficient, the preset integral coefficient and the preset differential coefficient are obtained; the first offset parameter of the adjustable gain is determined according to the preset proportional coefficient and error value; the adjustable gain is determined according to the preset integral coefficient and error value. The second offset parameter of the gain; determine the third offset parameter of the adjustable gain according to the preset differential coefficient and error value; calculate the sum of the first offset parameter, the second offset parameter and the third offset parameter to obtain Offset parameter for the adjustable gain of the RF link.

In an exemplary embodiment, the preset PID expression is Among them, u(k) represents the offset parameter, K _P represents the preset proportional coefficient, K _I represents the preset integral coefficient, K _D represents the preset differential coefficient, and e(k) represents the ratio between the current drain current and the target drain current. error value between Indicates the error obtained by multiple adjustments The accumulated value of the difference. The second offset parameter is obtained based on the product of the error accumulated value and the preset integral coefficient K _I. e(k)-e(k-1) represents the error value obtained by the current adjustment and the error value obtained by the last adjustment. The third offset parameter is obtained based on the product of the error difference and the preset differential coefficient K _I.

Among them, the adjustable gain of the radio frequency link is adjusted according to the offset parameter, including: obtaining the current adjustable gain of the radio frequency link corresponding to the current drain current; determining the radio frequency link according to the offset parameter and the current adjustable gain The target adjustable gain; sets the adjustable gain of the RF link to the target adjustable gain. It should be noted that the target adjustable gain of the radio frequency link can be obtained by calculating the sum of the offset parameter and the current adjustable gain. The adjustable gain of the radio frequency link is set to the target adjustable gain, so that the drain current of the power amplifier changes with The adjustable gain is adjusted to match the target drain current.

Step S204: Determine the fixed gain of the radio frequency link based on the target output power and the adjusted adjustable gain.

It should be noted that when the changed drain current matches the target drain current, it indicates that the output power of the power amplifier reaches the target output power. At this time, the radio frequency link can be determined based on the target output power and the adjusted adjustable gain. Fixed gain to accurately achieve power calibration. It has lower requirements on the power calibration environment and has good stability, which is very beneficial to the production control process. At the same time, it can reduce production costs by eliminating the need for radio frequency instruments.

In an exemplary embodiment, as shown in Figure 6, the adjustable gain of the radio frequency link includes a transmit variable gain of the transmit link and a feedback variable gain of the feedback link. By adjusting the transmit variable gain of the transmit link The feedback variable gain of the feedback link can adjust the adjustable gain of the radio frequency link. The fixed gain of the radio frequency link includes the fixed gain of the transmitting link and the fixed gain of the feedback link. Among them, the expression for calculating the fixed gain of the transmit link is GAIN _TX =P+GAIN _filter -TSSI-ATT _TXX , and the expression for calculating the fixed gain of the feedback link is GAIN _FB =FBSSI-(P+GAIN _filter )-ATT _FB . Among them, GAIN _TX represents the fixed gain of the transmit link, P represents the target output power, TSSI represents the transmit digital power of the transmit link, ATT _TXX represents the adjustable gain of the transmit link, GAIN _filter represents the filter gain, and GAIN _FB represents feedback. The fixed gain of the link, FBSSI represents the feedback digital power, and ATT _FB represents the adjustable gain of the feedback link.

In one embodiment, the transmission signal frequency corresponds to the fixed gain of the radio frequency link. If power calibration of the transmission signal frequency range [f ₀ , f _n-1 ] is required, the frequencies f ₀ to f _n need to be calculated. The fixed gain of the corresponding radio frequency link at _-1 . In an exemplary embodiment, after calculating the fixed gain of the radio frequency link corresponding to f ₀ through the present disclosure, according to the target current value corresponding to the next frequency f ₁ , return to step S202 to obtain the radio frequency link corresponding to f ₁ fixed gain until frequency f _n completes the traversal, and a calibration parameter data table is obtained. The calibration parameter data table records the fixed gains GAIN ₁ to GAIN _n- of the corresponding radio frequency links at frequencies f ₀ to f _n-1. ₁ .

The power calibration method provided in the above embodiments obtains the current drain current of the power amplifier and obtains the second relationship parameter, determines the target AD value corresponding to the target current value according to the second relationship parameter, and uses the target AD value as the target drain. current, where the target drain current matches the target output power of the power amplifier to be calibrated; according to the current drain current and the target drain current, the adjustable gain of the RF link is adjusted so that the drain current of the power amplifier can be adjusted with The gain is adjusted to change, and the changed drain current matches the target drain current; the fixed gain of the RF link is determined based on the target output power and the adjusted adjustable gain. This disclosure indirectly detects the output power of the power amplifier through the drain current of the power amplifier and the second relationship parameter, thereby calculating the fixed gain of the radio frequency link to achieve power calibration without the need for an external radio frequency instrument, eliminating the current power calibration method's burden on the radio frequency instrument. , line loss, fixtures and other environmental factors, eliminating the measurement errors introduced by them. It has low requirements on the power calibration environment and good stability, which is very conducive to the production control process and production cost control.

In one embodiment, the specific implementation of the power calibration method provided by the present disclosure is described through the following steps.

As shown in Figure 6, the radio frequency link of the base station includes a transmit link and a feedback link. The purpose is to calibrate the fixed gain GAIN _TX of the transmit link and the fixed gain GAIN _FB of the feedback link. ATT _TX is the adjustable gain of the transmit link, [ATT _MIN , ATT _MAX ] is the adjustable range of ATT _TX , STEP _MAX is the maximum adjustable step of the adjustable gain of the transmit link, [T _MIN , T _MAX ] is the allowable operating temperature range of the power amplifier during the calibration process, E _AD is the maximum allowable error between the final current AD value and the target current AD value, P is the target output power of the power amplifier, and GAIN _filter is the gain of the filter at frequency f _n , TSSI is the transmit digital power, FBSSI is the feedback digital power. The following local units involving power are all in dBm or dB.

(1) Turn off the baseband, turn off the channel power amplifier, and set the feedback link adjustable gain ATT _FB .

(2) Read the AD value A _d detected by the power amplifier drain detection circuit.

(3) Calculate the AD value AD _G =w*I _n +d+(A _d -A ₀ ) of _the target current In corresponding to the frequency fn. (The purpose of (A _d -A ₀ ) is to eliminate the influence of temperature drift of the current detection circuit), A ₀ is the AD value detected by the current detection circuit when the power amplifier is turned off and ATT _FB is not set, and w is the difference between the current value and the AD value The second slope of , such as w=(A ₂ -A ₁ )/(I _max -I _min ), and d is the second intercept, such as d=A ₂ -w*I _max .

(4) The current approximation implemented below uses the linear method. Set the single tone signal of frequency fn of the base station transmit link, set the initial adjustable gain of the transmit link ATT _TX1 = (ATT _MIN + ATT _MAX )/2, turn on the baseband signal, turn on the channel power amplifier, read the corresponding current AD value and record it as : AD1; set the initial adjustable gain ATT _TX2 = ATT _TX1 +2dB, read the current AD value and record it as: AD2.

(5) Calculate the slope k=(ATT _TX2 -ATT _TX1 )/(AD ₂ -AD ₁ ); b=ATT _TX2 -k*AD ₂ . If k=0 or AD2=AD1, discard the k and b parameters calculated this time and use the last k and b parameters.

(6) Calculate the target adjustable gain ATT _TXX =k*AD _G +b. If ATT _TXX -ATT _TX2 >maximum adjustable step STEP _MAX , then ATT _TXX =ATT _TX2 +STEP _MAX . If the adjustable gain ATT _TXX >ATT _MAX , it is judged that the closed loop fails and exits. Read the power amplifier temperature _PAT . If _PAT is not in the range [T _MIN , T _MAX ], it will be judged as over temperature and exit.

(7) Set ATT _TXX , read the current current _AD value and record _it as _: _AD

(8) If |△AD|<E _AD , it is judged that the current approximation is successful, otherwise ATT _TX1 =ATT _TX2 , ATT _TX2 =ATT _TXX , AD ₁ =AD ₂ , AD ₂ =AD _X , return to step (5). Set the number of loops to return to avoid infinite loops.

(9) Calculate the output fixed gain GAIN _TX of frequency fn =P+GAIN _filter -TSSI-ATT _TXX , and the feedback fixed gain GAIN _FB =FBSSI-(P+GAIN _filter )-ATT _FB .

(10) The frequency f _n can be multiple. If the frequency f _n has not been traversed completely, return to step (3). Otherwise, turn off the power amplifier and complete the calibration.

Please refer to FIG. 7 , which is a schematic structural block diagram of a wireless communication device provided by the present disclosure.

As shown in Figure 7, the wireless communication device 300 includes a processor 301 and a memory 302. The processor 301 and the memory 302 are connected through a bus 303, which is, for example, an I2C (Inter-integrated Circuit) bus. Wireless communications device 300 also includes a power amplifier 304. The wireless communication device 300 can be any base station including a power amplifier including an active antenna unit (Active Antenna Unit, AAU) and a radio remote unit (Radio Remote Unit, RRU).

In an exemplary embodiment, the processor 301 is used to provide computing and control capabilities to support the operation of the entire wireless communication device 300 . The processor 301 can be a central processing unit (Central Processing Unit, CPU). The processor 301 can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC). ), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor.

In an exemplary embodiment, the memory 302 may be a Flash chip, a read-only memory (ROM, Read-Only Memory) disk, an optical disk, a USB disk, a mobile hard disk, or the like.

Those skilled in the art can understand that the structure shown in Figure 7 is only a block diagram of a partial structure related to the present disclosure, and does not constitute a limitation on the wireless communication device 300 to which the present disclosure is applied. The specific wireless communication device 300 may include more or fewer components than shown, some combinations of components, or a different arrangement of components.

Wherein, the processor is used to run a computer program stored in the memory, and implement any one of the power scaling methods provided by this disclosure when executing the computer program.

In one embodiment, the processor is configured to execute a computer program stored in the memory, and when executing the computer program Implement the following steps: obtain the current drain current of the power amplifier and obtain the target drain current, where the target drain current matches the target output power to be calibrated of the power amplifier; based on the current drain current and the target drain current, calculate the radio frequency chain The adjustable gain of the circuit is adjusted so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the changed drain current matches the target drain current; according to the target output power and the adjusted adjustable Gain, determines the fixed gain of the RF link.

In one embodiment, when adjusting the adjustable gain of the radio frequency link based on the current drain current and the target drain current, the processor is configured to: determine the radio frequency based on the current drain current and the target drain current. The target adjustable gain of the link; adjust the adjustable gain of the radio frequency link according to the target adjustable gain.

In one embodiment, when obtaining the current drain current of the power amplifier, the processor is configured to: obtain the first adjustable gain, and set the adjustable gain of the radio frequency link to the first adjustable gain to obtain the first adjustable gain. The first drain current of the power amplifier under an adjustable gain; determine the second adjustable gain according to the first adjustable gain, and set the adjustable gain of the radio frequency link to the second adjustable gain to obtain the second adjustable gain. The second drain current of the power amplifier at gain.

In one embodiment, when determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current, the processor is configured to: based on the first adjustable gain, the first drain current, the third The second adjustable gain and the second drain current are used to obtain the first relationship parameter, which is used to characterize the linear relationship between the adjustable gain and the drain current; according to the first relationship parameter and the target drain current, the radio frequency is determined The target adjustable gain of the link.

In one embodiment, when the processor obtains the first relationship parameter based on the first adjustable gain, the first drain current, the second adjustable gain, and the second drain current, the processor is configured to: calculate the first adjustable gain. Adjust the first difference between the gain and the second adjustable gain, and calculate the second difference between the first drain current and the second drain current; based on the first difference and the second difference, determine the Adjust the first slope between the gain and the drain current; obtain the first intercept based on the first slope, the second drain current and the second adjustable gain; use the first slope and the first intercept as the first relationship parameter .

In one embodiment, when determining the target adjustable gain of the radio frequency link based on the first relationship parameter and the target drain current, the processor is configured to: determine the radio frequency chain based on the first relationship parameter and the target drain current. The third adjustable gain of the radio frequency link; set the adjustable gain of the radio frequency link to the third adjustable gain, and detect the third drain current of the power amplifier under the third adjustable gain; when the third drain current is consistent with the target drain When the difference between the pole currents is less than or equal to the preset difference, the third adjustable gain is used as the target adjustable gain of the radio frequency link.

In one embodiment, after detecting the third drain current of the power amplifier under the third adjustable gain, the processor is further configured to: the difference between the third drain current and the target drain current is greater than a predetermined value. When setting the difference, let the value of the first adjustable gain be the value of the second adjustable gain, the value of the second adjustable gain be the value of the third adjustable gain, and let the value of the first drain current be the value of the second The value of the drain current and the value of the second drain current are the value of the third drain current, so as to return to execution according to the first adjustable gain, the first drain current, the second adjustable gain and the second drain current, Steps to obtain first relationship parameters.

In one embodiment, the processor determines the third adjustable gain of the radio frequency link according to the first relationship parameter and the target drain current, and is used to: calculate the radio frequency chain according to the first relationship parameter and the target drain current. The fourth adjustable gain of the path; calculate the gain difference between the fourth adjustable gain and the second adjustable gain; when the gain difference is less than or equal to the preset maximum adjustable step, the fourth adjustable gain It is determined as the third adjustable gain; when the gain difference is greater than the maximum adjustable step, the sum of the second adjustable gain and the maximum adjustable step is determined as the third adjustable gain.

In one embodiment, when determining the target adjustable gain of the radio frequency link based on the current drain current and the target drain current, the processor is configured to: calculate the error between the current drain current and the target drain current. value; determine the offset parameter of the adjustable gain of the radio frequency link based on the error value and the preset PID expression; determine the target adjustable gain of the radio frequency link based on the offset parameter.

In one embodiment, when acquiring the target drain current, the processor is configured to: acquire a second relationship parameter, and the second relationship parameter is used to characterize the linear relationship between the current value of the drain current and the AD value; according to The second relationship parameter determines the target AD value corresponding to the target current value, and uses the target AD value as the target drain current.

In one embodiment, when acquiring the second relationship parameter, the processor is configured to: respectively set the drain voltage of the power amplifier. The flow is the first current value and the second current value to detect the first AD value corresponding to the first current value and the second AD value corresponding to the second current value; calculate the AD between the first AD value and the second AD value. difference, and calculate the current difference between the first current value and the second current value; according to the AD difference and the current difference, determine the second slope between the current value and the AD value; according to the second slope, the second The AD value and the second current value are used to obtain the second intercept; the second slope and the second intercept are used as the second relationship parameters.

In one embodiment, when determining the target AD value corresponding to the target current value according to the second relationship parameter, the processor is configured to: obtain the target current value corresponding to the transmission signal frequency of the transmission link; calculate the target current value and The product value between the second slopes; based on the sum of the product value and the second intercept, the target AD value corresponding to the target current value is obtained.

In one embodiment, when the processor obtains the target AD value corresponding to the target current value based on the sum of the product value and the second intercept, it is used to: obtain the standard of the drain current when the power amplifier is turned off at a standard temperature. AD value, and obtain the third AD value of the drain current when the power amplifier is turned off at the current temperature; calculate the target difference between the standard AD value and the third AD value; calculate the product value, the second intercept and the target difference and, get the target AD value.

In one embodiment, the processor also implements: detecting the output power of multiple power amplifiers when the drain current reaches the target current value, and obtaining the output power of the multiple power amplifiers; sorting the output powers of the multiple power amplifiers, and sorting the output power according to the sorting results. Select multiple candidate output powers from multiple output powers; average the multiple candidate output powers to obtain the target output power of the power amplifier to be calibrated.

In one embodiment, the radio frequency link includes a transmission link; when determining the fixed gain of the radio frequency link according to the target output power and the adjusted adjustable gain, the processor is configured to: obtain the transmission corresponding to the target output power. The transmit digital power of the link; obtain the filter gain corresponding to the transmit signal frequency of the transmit link; calculate the fixed gain of the transmit link based on the target output power, transmit digital power, filter gain and adjusted adjustable gain.

In one embodiment, the radio frequency link also includes a feedback link; the processor is further configured to: obtain the feedback digital power of the feedback link corresponding to the target output power; obtain the preset adjustable gain of the feedback link; and according to the feedback Digital power, target output power, filter gain and adjustable gain of the feedback link, calculates the fixed gain of the feedback link.

It should be noted that those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the wireless communication device 300 described above can be referred to the corresponding process in the aforementioned power calibration method embodiment. This will not be described again.

The present disclosure also provides a storage medium for computer-readable storage. The storage medium stores one or more programs. The one or more programs can be executed by one or more processors to implement any of the methods provided by the present disclosure. Steps of term power scaling method.

The storage medium may be an internal storage unit of the wireless communication device described in the previous embodiment, such as a hard disk or memory of the wireless communication device. The storage medium can also be an external storage device of the wireless communication device, such as a plug-in hard disk equipped on the wireless communication device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash memory card (Flash) Card) etc.

Those of ordinary skill in the art can understand that all or some steps, systems, and functional modules/units in the devices disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may consist of several physical components. Components execute cooperatively. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cartridges, tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The present disclosure provides a power calibration method, a wireless communication device and a storage medium. The present disclosure obtains the current drain current of a power amplifier and obtains a target drain current, wherein the target drain current is consistent with the target output power of the power amplifier to be calibrated. Matching; adjust the adjustable gain of the radio frequency link according to the current drain current and the target drain current, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the changed drain current matches the target The drain currents are matched; the fixed gain of the RF link is determined based on the target output power and the adjusted adjustable gain. This disclosure indirectly detects the output power of the power amplifier through the drain current of the power amplifier, thereby calculating the fixed gain of the radio frequency link to achieve power calibration. There is no need for external radio frequency instruments, and the current power calibration method eliminates the burden on radio frequency instruments, line losses, fixtures, etc. The dependence on environmental factors eliminates the measurement errors introduced by them. Therefore, the requirements for the power calibration environment are low and the stability is good, which is very conducive to the production control process. At the same time, because the radio frequency instrument is omitted, the production cost can be reduced. The technical solution of the present disclosure does not require external radio frequency instruments, can eliminate measurement errors introduced by environmental factors, and reduce environmental requirements for power calibration.

The above serial numbers of the present disclosure are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present disclosure. Modifications or substitutions, these modifications or substitutions should be covered by the protection scope of this disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

A power calibration method, including:

Obtain the current drain current of the power amplifier and obtain the target drain current, wherein the target drain current matches the target output power of the power amplifier to be calibrated;

According to the current drain current and the target drain current, the adjustable gain of the radio frequency link is adjusted, so that the drain current of the power amplifier changes with the adjustment of the adjustable gain, and the changed The drain current matches the target drain current;

The fixed gain of the radio frequency link is determined according to the target output power and the adjusted adjustable gain.
The power scaling method according to claim 1, wherein the adjusting the adjustable gain of the radio frequency link according to the current drain current and the target drain current includes:

Determine a target adjustable gain of the radio frequency link according to the current drain current and the target drain current;

The adjustable gain of the radio frequency link is adjusted according to the target adjustable gain.
The power calibration method according to claim 2, wherein said obtaining the current drain current of the power amplifier includes:

Obtain a first adjustable gain, and set the adjustable gain of the radio frequency link to the first adjustable gain to obtain the first drain current of the power amplifier under the first adjustable gain;

Determine a second adjustable gain according to the first adjustable gain, and set the adjustable gain of the radio frequency link to the second adjustable gain to obtain the power amplifier under the second adjustable gain. of the second drain current.
The power scaling method according to claim 3, wherein determining the target adjustable gain of the radio frequency link according to the current drain current and the target drain current includes:

According to the first adjustable gain, the first drain current, the second adjustable gain and the second drain current, a first relationship parameter is obtained, and the first relationship parameter is used to characterize the adjustable gain and the drain current. Linear relationship between currents;

A target adjustable gain of the radio frequency link is determined based on the first relationship parameter and the target drain current.
The power scaling method according to claim 4, wherein the first relationship parameter is obtained according to the first adjustable gain, the first drain current, the second adjustable gain and the second drain current, including :

Calculating a first difference between the first adjustable gain and the second adjustable gain, and calculating a second difference between the first drain current and the second drain current;

Determine a first slope between the adjustable gain and the drain current according to the first difference and the second difference;

Obtain a first intercept according to the first slope, the second drain current and the second adjustable gain;

The first slope and the first intercept are used as the first relationship parameters.
The power scaling method according to claim 4, wherein determining the target adjustable gain of the radio frequency link according to the first relationship parameter and the target drain current includes:

Determine a third adjustable gain of the radio frequency link according to the first relationship parameter and the target drain current;

Set the adjustable gain of the radio frequency link to the third adjustable gain, and detect the third drain current of the power amplifier under the third adjustable gain;

When the difference between the third drain current and the target drain current is less than or equal to the preset difference, the third adjustable gain is used as the target adjustable gain of the radio frequency link.
The power scaling method according to claim 6, wherein after detecting the third drain current of the power amplifier under the third adjustable gain, it further includes:

When the difference between the third drain current and the target drain current is greater than the preset difference, let the value of the first adjustable gain be the value of the second adjustable gain, The value of the second adjustable gain is the third adjustable gain value, and let the value of the first drain current be the value of the second drain current, and the value of the second drain current be the value of the third drain current, so as to return to execute the The step of obtaining a first relationship parameter according to the first adjustable gain, the first drain current, the second adjustable gain and the second drain current.
The power scaling method according to claim 6, wherein determining the third adjustable gain of the radio frequency link according to the first relationship parameter and the target drain current includes:

Calculate a fourth adjustable gain of the radio frequency link according to the first relationship parameter and the target drain current;

Calculate the gain difference between the fourth adjustable gain and the second adjustable gain;

When the gain difference is less than or equal to the preset maximum adjustable step, determine the fourth adjustable gain as the third adjustable gain;

When the gain difference is greater than the maximum adjustable step, the sum of the second adjustable gain and the maximum adjustable step is determined as the third adjustable gain.
The power scaling method according to claim 2, wherein determining the target adjustable gain of the radio frequency link according to the current drain current and the target drain current includes:

Calculate the error value between the current drain current and the target drain current;

Determine the offset parameter of the adjustable gain of the radio frequency link according to the error value and the preset PID formula;

Based on the offset parameter, a target adjustable gain of the radio frequency link is determined.
The power scaling method according to any one of claims 1 to 9, wherein said obtaining the target drain current includes:

Obtain a second relationship parameter, which is used to characterize the linear relationship between the current value of the drain current and the AD value;

The target AD value corresponding to the target current value is determined according to the second relationship parameter, and the target AD value is used as the target drain current.
The power calibration method according to claim 10, wherein said obtaining the second relationship parameter includes:

Setting the drain current of the power amplifier to a first current value and a second current value respectively to detect the first AD value corresponding to the first current value and the second AD value corresponding to the second current value;

Calculate the AD difference between the first AD value and the second AD value, and calculate the current difference between the first current value and the second current value;

According to the AD difference and the current difference, determine a second slope between the current value and the AD value;

According to the second slope, the second AD value and the second current value, a second intercept is obtained;

The second slope and the second intercept are used as the second relationship parameters.
The power calibration method according to claim 11, wherein determining the target AD value corresponding to the target current value according to the second relationship parameter includes:

Obtain the target current value corresponding to the transmission signal frequency of the radio frequency link;

Calculate the product value between the target current value and the second slope;

According to the sum of the product value and the second intercept, a target AD value corresponding to the target current value is obtained.
The power calibration method according to claim 12, wherein obtaining the target AD value corresponding to the target current value based on the sum of the product value and the second intercept includes:

Obtain the standard AD value of the drain current when the power amplifier is turned off at the standard temperature, and obtain the third AD value of the drain current when the power amplifier is turned off at the current temperature;

Calculate a target difference between the standard AD value and the third AD value;

Calculate the sum of the product value, the second intercept and the target difference value to obtain the target AD value.
The power calibration method according to any one of claims 1-9, wherein the method further includes:

Detect the output power of multiple power amplifiers when their drain current reaches the target current value, and obtain the output power of multiple power amplifiers;

Sort the output powers of the plurality of power amplifiers, and select a plurality of candidate output powers from the plurality of output powers according to the sorting results;

The multiple candidate output powers are averaged to obtain the target output power of the power amplifier to be calibrated.
The power calibration method according to any one of claims 1 to 9, wherein the radio frequency link includes a transmit link; and determining the target output power according to the target output power and the adjusted adjustable gain. The fixed gain of the radio frequency link includes:

Obtain the transmit digital power of the transmit link corresponding to the target output power;

Obtain the filter gain corresponding to the transmission signal frequency of the transmission link;

The fixed gain of the transmit link is calculated based on the target output power, transmit digital power, filter gain and the adjusted adjustable gain.
The power calibration method according to claim 15, wherein the radio frequency link further includes a feedback link; the method further includes:

Obtain the feedback digital power of the feedback link corresponding to the target output power;

Obtain the preset adjustable gain of the feedback link;

The fixed gain of the feedback link is calculated based on the feedback digital power, the target output power, the filter gain and the adjustable gain of the feedback link.
A wireless communication device, including a power amplifier, a processor, a memory, a computer program stored on the memory and executable by the processor, and data for realizing connection communication between the processor and the memory A bus, wherein when the computer program is executed by the processor, the steps of the power scaling method according to any one of claims 1 to 16 are implemented.
A storage medium for computer-readable storage, the storage medium stores one or more programs, the one or more programs can be executed by one or more processors to implement any of claims 1 to 16 The steps of the power calibration method described in one item.