CN116961785A - RU equipment downlink gain calibration method and RU equipment - Google Patents

RU equipment downlink gain calibration method and RU equipment Download PDF

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Publication number
CN116961785A
CN116961785A CN202310887009.8A CN202310887009A CN116961785A CN 116961785 A CN116961785 A CN 116961785A CN 202310887009 A CN202310887009 A CN 202310887009A CN 116961785 A CN116961785 A CN 116961785A
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China
Prior art keywords
equipment
gain
signal
loop gain
loop
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吕方
赵宏伟
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CIG Shanghai Co Ltd
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CIG Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Abstract

The application provides an RU equipment calibration method and RU equipment, wherein the method comprises the steps of obtaining an RU equipment input signal, and processing the RU equipment input signal to obtain an input digital signal; performing loop gain processing on the input digital signal to obtain a feedback signal, and obtaining loop gain of RU equipment according to the input digital signal and the feedback signal; according to the loop gain of the RU equipment, controlling the output of an antenna port of the RU equipment to obtain an RU equipment output signal; obtaining the downlink gain of the RU equipment according to the RU equipment input signal and the RU equipment output signal; changing the central frequency of the RU equipment according to the loop gain of the RU equipment and the output signal of the RU equipment to obtain calibration data; and calibrating the downlink gain of the RU equipment according to the calibration data.

Description

RU equipment downlink gain calibration method and RU equipment
Technical Field
The present application relates to the field of base station control, and in particular, to a method for calibrating downlink gain of RU equipment and RU equipment.
Background
In a wireless communication system, base stations and small base station devices play a key role in providing wireless signal coverage and communication services. These devices typically include a series of radio frequency units (RU) for receiving and transmitting wireless signals. In order to ensure the normal operation of the system, the downlink gain of the RU device needs to be precisely controlled within a specific numerical range, and is achieved by adjusting the output power of the antenna port.
However, the prior art has some problems. First, due to nonlinear characteristics, frequency drift, environmental changes, and other factors, the downlink gain of RU equipment may not be accurately controlled, resulting in a reduced system performance or an inability to meet the requirements. Secondly, the existing calibration method has limitations in loop gain control, and cannot be accurately calibrated and adjusted under different frequencies and environmental conditions.
Disclosure of Invention
An object of the present application is to provide a method for calibrating a downlink gain of an RU device and the RU device, at least for enabling the method to ensure that the downlink gain of the RU device can be controlled to an accurate value.
To achieve the above object, some embodiments of the present application provide a method for calibrating downlink gain of RU equipment, which is characterized in that the method includes: acquiring an RU input signal, and processing the RU input signal to obtain an input digital signal; performing loop gain processing on the input digital signal to obtain a feedback signal, and obtaining loop gain of RU equipment according to the input digital signal and the feedback signal; according to the loop gain of the RU equipment, controlling the output of an antenna port of the RU equipment to obtain an RU equipment output signal; obtaining the downlink gain of the RU equipment according to the RU equipment input signal and the RU equipment output signal; changing the central frequency of the RU equipment according to the loop gain of the RU equipment and the output signal of the RU equipment to obtain calibration data; and calibrating the downlink gain of the RU equipment according to the calibration data.
Further, the obtaining RU loop gain includes:
the sequence length of the input digital signal is N, each number in the sequence is complex, the input digital signal comprises an I item and a Q item, the I item and the Q item are m bit signed numbers, and the full scale decibel value P of the input digital signal In The calculation is carried out to obtain:
the feedback signal has a sequence length of N, each number in the sequence is complex, the sequence comprises an I item and a Q item, the I item and the Q item are x bit signed numbers, and the feedback signal has a full-scale decibel value P Orx The calculation is carried out to obtain:
the loop Gain Loop The calculation is carried out to obtain:
Gain Loop ＝P Orx -P In 。
further, the obtaining the RU downlink gain includes: the RU device input signal is set to P IQ_IN The unit is dBFS; the RU device output signal is set to P Out The unit is dBm, and the RU equipment performs downlink Gain RU_DL The method comprises the following steps:
Gain RU_DL ＝P Out -P IQ_IN 。
further, the obtaining calibration data includes the steps of: s1, controlling a program-controlled attenuator through a loop Gain control module of the RU equipment to control the loop Gain of the RU equipment to two different values Gain Loop1 And Gain Loop2 Record the RU device output signal P at this time Out1 And P Out2 Simultaneously recording RU device input signal P IQ_IN Establishing a corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment; s2, changing the central frequency of the RU equipment, and repeating the step S1 under a plurality of central frequencies to obtain the corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment under different central frequencies, wherein the corresponding relation is used as the calibration data;
further, the calibrating the RU device downlink gain includes: at a first center frequency F 0 Determining target downlink Gain of RU equipment RU_DL-taeget According to the target downlink Gain of the RU equipment, the target loop Gain of the RU equipment is calculated Loop-target And (3) performing calculation:
that is, the RU device loop Gain is controlled to Gain Loop-target Obtaining target downlink Gain of RU equipment RU_DL-target 。
Further, the method further comprises: when the downlink gain of the RU equipment does not reach the target downlink gain of the RU equipment, calculating the loop gain of the RU equipment by adopting a first calculation frequency; and when the RU equipment downlink gain reaches the RU equipment target downlink gain, calculating the RU equipment loop gain by adopting a second calculation frequency.
Further, the method further comprises: and when the running center frequency of the RU equipment is not in the center frequency range of the calibration data, performing frequency compensation on the RU equipment by a difference method.
Some embodiments of the present application also provide an RU apparatus, the apparatus comprising: the RU equipment signal input module is used for acquiring RU equipment input signals and sending input digital signals obtained by processing the RU equipment input signals to the loop gain module; the loop gain module is used for acquiring the input digital signal, processing the input digital signal to obtain loop gain of RU equipment; and the RU equipment signal output module is used for outputting an RU equipment output signal according to the RU equipment loop gain.
Compared with the prior art, the method for calibrating the downlink gain of the RU equipment in the scheme provided by the embodiment of the application is characterized by comprising the following steps: first, it obtains an input digital signal by acquiring an input signal of the RU device and processing the input signal. Then, a feedback signal is obtained by performing loop gain processing on the input digital signal. Then, loop gain of the RU device is calculated using a combination of the input digital signal and the feedback signal. And controlling the antenna port output of the RU equipment according to the calculated loop gain to obtain an output signal of the RU equipment. Further, the downlink gain of the RU device is calculated using the input signal and the output signal of the RU device. Then, the center frequency of the RU device is adjusted according to the loop gain of the RU device and the output signal to acquire calibration data. And finally, calibrating the downlink gain of the RU equipment by using the calibration data. In general, the embodiments of the present application achieve accurate calibration of RU device downstream gain by employing loop gain control and recording of calibration data. Compared with the prior art, the method has more accurate control capability and adaptability, and can improve the performance and stability of the wireless communication system.
Drawings
Fig. 1 is a schematic flow chart of a method for calibrating downlink gain of RU equipment according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of RU device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following terms are used herein.
IFFT (Inverse Fast Fourier Transform): for converting the signal of the frequency domain representation back to the time domain representation. Fourier transform is a method of converting a signal from a time domain representation to a frequency domain representation, which decomposes the signal into a series of sum of sine and cosine functions, resulting in component information of the signal at different frequencies. Fourier transforms have wide application in signal processing and spectral analysis. The inverse fourier transform is the inverse of the fourier transform, which reconverts the signal of the frequency domain representation into a time domain representation. The inverse fourier transform may be used to recover the time domain waveform of the signal from the frequency domain for further processing and analysis.
FPGA chip (Field-Programmable Gate Array): an FPGA chip is a programmable logic device that can be programmed to implement a variety of digital circuit functions. Unlike fixed function integrated circuits (ASICs), FPGA chips have programmable arrays of logic gates and programmable internal connection structures. The FPGA chip contains a large number of logic blocks and programmable connection resources. The logic blocks are generally composed of logic gates, registers, and other ancillary circuits, and can implement various logic functions. Programmable connection resources allow a designer to connect logic blocks together to construct a desired digital circuit architecture according to specific application requirements. Programming of FPGA chips is typically performed using Hardware Description Languages (HDLs) such as VHDL or Verilog. The designer may write HDL code according to design requirements describing the desired logic functions and circuit connection relationships. Then, these HDL codes undergo processes such as synthesis, layout, and configuration, and generate bit files (bitstreams) for specific FPGA chips. The bit file is loaded into the FPGA chip to enable the FPGA chip to realize the required digital circuit functions according to design requirements.
ADC digital-to-analog conversion circuit: is an electronic device or circuit for converting an analog signal into a corresponding digital representation. In RU devices, ADC digital-to-analog conversion circuits function to convert analog signals from an analog signal source to digital signals for digital signal processing, control, and analysis. It is a critical component in converting a continuous analog signal to a discrete digital signal.
Modulation circuit (modulator): is an electronic device or circuit for modulating an analog signal or a digital signal onto a high frequency carrier wave for transmission in a communication system. In RU devices, modulation circuitry functions to modulate a baseband signal onto a carrier wave at a Radio Frequency (RF) frequency in order to transmit the signal into a wireless channel.
Program controlled attenuator: is an electronic device or circuit for controlling signal strength. It is able to attenuate the signal as needed, i.e. reduce the power level of the signal. In RU devices, a programmable attenuator is often used to control the power level of a radio frequency signal output from an antenna port, so as to control the downlink gain of the RU device. It is typically located in a loop gain control module that changes the loop gain by adjusting the amount of attenuation.
Demodulation circuit (demodulator): is an electronic device or circuit for converting a modulated signal back to an original baseband signal. In communication systems, modulation techniques are often used to modulate a baseband signal onto a high frequency carrier for transmission, and demodulation circuitry is used to recover the original baseband signal. In RU devices, demodulation circuits are commonly used to receive and demodulate received radio frequency signals, converting them into digital signals or baseband signals. The function of the demodulation circuit is to remove the carrier wave and recover the amplitude, frequency, phase, etc. characteristics of the modulated signal for subsequent signal processing and decoding.
DAC analog-to-digital conversion circuit: is an electronic device or circuit for converting a digital signal into a corresponding analog signal. In digital systems, the DAC functions to convert digital data into analog signals for further processing in analog circuitry or to drive analog devices. In RU devices, DAC analog-to-digital conversion circuits are used to convert digital signals to analog signals for subsequent signal processing and output. It converts the digital data stream into a continuous analog signal for amplification, filtering, modulation or driving external devices in the analog domain.
The base station and small base station systems need to ensure that the downlink gain of the RU device can be accurately controlled within a specific range of values. To achieve the objective, the present application provides a RU device downlink gain calibration method based on closed loop gain control, as shown in fig. 1, the method includes steps S101 to S106:
s101, acquiring an RU equipment input signal, and processing the RU equipment input signal to obtain an input digital signal. The input signal to the RU device is a signal obtained from an external signal source (e.g., a base station or a small cell system), and the signal is typically an analog signal. In RU devices, an IQ input signal first enters an FPGA chip and is processed by a series of processing modules, including an IFFT (inverse fast fourier transform) and other data processing modules, to obtain an input digital signal (represented in the time domain) for a loop gain control module, which is used in subsequent loop gain control and other data processing modules. The input digital signal contains information about the input signal from the RU device for subsequent loop gain calculation and control operations.
S102, performing loop gain processing on the input digital signal to obtain a feedback signal, and obtaining the loop gain of RU equipment according to the input digital signal and the feedback signal. The loop gain processing is performed on the input digital signal in order to calculate the loop gain of the RU device. This process involves processing the input digital signal using a loop gain control module to generate a feedback signal. Specifically, the processing of the input digital signal by the loop gain control module may include filtering, amplifying, phase adjusting, etc. the signal to achieve the desired loop gain control effect. The purpose of these processing operations is to adjust the characteristics of the signal and the magnitude of the gain, based on the characteristics of the input digital signal and the loop gain requirements, to generate a suitable feedback signal. The feedback signal is a signal generated according to the input digital signal and the processing result of the loop gain control module. It reflects the effect of the loop gain control module on the adjustment of the input signal and the difference from the expected loop gain. By comparing and analyzing the input digital signal and the feedback signal, the loop gain of the RU device can be calculated. The loop gain refers to the gain effect achieved after the loop gain control module processes the input signal. Which represents the degree to which the loop control system amplifies or attenuates the input signal. By comparing the difference between the input signal and the feedback signal and combining the characteristics of the loop gain control module, the loop gain of the RU device under given conditions can be calculated.
S103, according to the loop gain of the RU equipment, controlling the output of an antenna port of the RU equipment to obtain an output signal of the RU equipment. This process involves adjusting the loop gain using a loop gain control module and adjusting the output power of the antenna ports accordingly. After the loop gain control module calculates the loop gain of the RU device, it may control the output power of the antenna port according to the value of the loop gain. Specific control mechanisms may include adjusting the gain or attenuation of the power amplifier, as well as adjusting other related parameters, to achieve a desired output power. By controlling the output power of the antenna port, the RU device may generate a desired radio frequency signal, which may be transmitted to a target device or receiver. The rf signal may be modulated, amplified, filtered, etc. to meet specific communication requirements. Thus, by controlling the output power of the antenna port according to the loop gain of the RU device, an output signal of the RU device, which is a result of the loop gain control and adjustment, can be obtained. This ensures that the output signal of the RU device is as expected and meets the specific communication system requirements.
S104, obtaining the downlink gain of the RU equipment according to the RU equipment input signal and the RU equipment output signal. The downstream gain represents the gain or amplification between the input signal and the output signal. First, by measuring or recording the power level of an input signal of an RU device, the strength of the input signal can be determined. This may be based on the voltage, power or other relevant parameters of the input signal. The power level of the output signal of the RU device is then measured or recorded and the strength of the output signal can be determined. Similarly, this may be based on the voltage, power, or other relevant parameters of the output signal. By comparing the power levels of the input signal and the output signal, the downlink gain of the RU device can be calculated as follows:
downstream gain = output signal power level-input signal power level
Thus, by measuring or recording the power levels of the input signal and the output signal and performing corresponding calculations, the downlink gain of the RU device can be obtained. The value of the downlink gain can be used to evaluate the amplification capability of the RU device and serve as a reference parameter for calibration and control.
S105, changing the central frequency of the RU equipment according to the loop gain of the RU equipment and the output signal of the RU equipment to obtain calibration data. The calibration data is used to establish a correspondence between loop gain and antenna port output power for subsequent calibration and control operations. For example, in an initial state, an initial center frequency is selected and the RU device is set to the frequency. And calculating the required calibration data through a corresponding algorithm or calculation method according to the loop gain and the output signal of the RU equipment. This may be data obtained by recording the correspondence between different loop gains and output powers. The center frequency of the RU device is changed, set to the next target frequency, and the above steps are repeated until the required frequency range is covered or the required amount of calibration data meets the requirements. And (3) sorting and recording the obtained calibration data to form a calibration data table or curve, wherein the calibration data table or curve comprises the corresponding relation between loop gains and antenna port output powers under different frequencies. Through the above steps, the calibration data can be obtained by changing the center frequency according to the loop gain and the output signal of the RU device and recording the related data, for subsequent loop gain control and power adjustment operations. Such calibration data may be provided to a loop gain control module reference to enable accurate power control and downstream gain calibration.
S106, calibrating the downlink gain of the RU equipment according to the calibration data. The purpose of the calibration is to adjust the downlink gain of the RU device to the desired exact value to achieve the required signal transmission and power control. For example, using the calibration data (table or curve) acquired in step S105, the corresponding antenna port output power is found based on the current center frequency and loop gain value. Comparing the current antenna port output power with the expected target power, calculating the difference value between the current antenna port output power and the expected target power, adjusting the downlink gain of RU equipment by controlling a program-controlled attenuator or other corresponding adjusting devices according to the difference value, and repeating the steps until the required accurate downlink gain value or the accuracy requirement within the error range is reached. By adjusting the downlink gain of the RU device according to the calibration data, it can ensure the RU device to output the required power level at different frequencies, and realize accurate signal transmission and control, so that the performance and stability of the base station or the small base station system can be ensured, so as to meet the requirements and standards of the communication system.
In some embodiments of the application, the IQ input signal of the RU device is adjusted to a fixed value P IQ_IN . Because IQ input signals are fixed values, after IFFT and other data processing modules, the input digital signals to the loop gain control module are also fixed values. In the loop gain module, full-scale decibel values of the input digital signal and the feedback signal are calculated respectively.
The obtaining RU loop gain includes: the sequence length of the input digital signal is N, each number in the sequence is complex, the input digital signal comprises an I item and a Q item, the I item and the Q item are m bit signed numbers, and the full scale decibel value P of the input digital signal In The calculation is carried out to obtain:
the feedback signal has a sequence length of N, each number in the sequence is complex, the sequence comprises an I item and a Q item, the I item and the Q item are x bit signed numbers, and the feedback signal has a full-scale decibel value P Orx The calculation is carried out to obtain:
the loop Gain Loop The calculation is carried out to obtain:
Gain Loop ＝P Orx -P In 。
in some embodiments of the present application, the obtaining the RU downlink gain includes: the RU device input signal is set to P IQ_IN The unit is dBFS; the RU device output signal is set to P Out The unit is dBm, and the RU equipment performs downlink Gain RU_DL The method comprises the following steps:
Gain RU_DL ＝P Out -P IQ_IN 。
in some embodiments of the application, the obtaining calibration data comprises the steps of: s1, controlling program control through a loop gain control module of RU equipmentAttenuator for controlling loop Gain of RU equipment to two different values Gain Loop1 And Gain Loop2 Record the RU device output signal P at this time Out1 And P Out2 Simultaneously recording RU device input signal P IQ_IN Establishing a corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment; s2, changing the central frequency of the RU equipment, and repeating the step S1 under a plurality of central frequencies to obtain the corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment under different central frequencies, wherein the corresponding relation is used as the calibration data.
The loop Gain control module controls the program-controlled attenuator to control the loop Gain to two different values Gain Loop1 And Gain Loop2 Recording the radio frequency output power P of the antenna port at the moment Out1 And P Out2 The magnitude of the IQ input signal at this time is recorded at the same time. Thus, the corresponding relation between the loop gain and the output power of the antenna port is established as follows
Changing the center frequency, repeating the above process at multiple center frequencies to form corresponding relationship between loop gain and antenna port output power at different frequencies, wherein the basic format of the calibration data is as follows (the following table contains 5 center frequency points as an example)
In some embodiments of the present application, after the calibration data is completed, the loop gain control module may adjust the program-controlled attenuator according to the calibration data, thereby controlling the loop gain, and adjusting the output power of the antenna port and the downlink gain of the RU device, where the calibrating the downlink gain of the RU device includes: at a first center frequency F 0 Determining target downlink Gain of RU equipment RU_DL-target According to the target downlink Gain of the RU equipment, the target loop Gain of the RU equipment is calculated Loop-target And (3) performing calculation:
namely, when the loop Gain control module adjusts the program-controlled attenuator, the loop Gain is adjusted to Gain Loop-target Obtaining the target downlink Gain of the RU equipment RU_DL-target 。
In some embodiments of the application, the method further comprises: when the downlink gain of the RU equipment does not reach the target downlink gain of the RU equipment, calculating the loop gain of the RU equipment by adopting a first calculation frequency; and when the RU equipment downlink gain reaches the RU equipment target downlink gain, calculating the RU equipment loop gain by adopting a second calculation frequency.
When the antenna port starts to transmit power, the downlink gain of the RU device needs to reach the target value quickly, and thus the loop gain needs to be adjusted frequently. At this time, a higher calculation frequency is adopted, the loop gain is calculated by comparing the difference between the input digital signal and the feedback signal, and the program-controlled attenuator is correspondingly adjusted to control the loop gain. Once the downlink gain of the RU device reaches a target value and stabilizes, in order to maintain its stability and reduce the overhead of calculation, the calculation frequency of the loop gain may be reduced, and the loop gain may be monitored at a lower period to ensure the stability of the loop gain. By adjusting the frequency of loop gain calculation according to the state of RU equipment downlink gain, the downlink gain can be quickly adjusted in the initial stage, and the calculated frequency can be reduced after stabilization, so that efficient control and monitoring can be realized, and meanwhile, the occupation of system resources can be reduced. Therefore, the running efficiency and the stability of the system can be improved while the performance requirement of RU equipment is met.
In some embodiments of the present application, in order to avoid that the attenuation of the program controlled attenuator is too small when the loop gain control module starts the first operation, an excessive initial signal is brought to the power amplifier to cause damage, and an appropriate initial value needs to be set for the program controlled attenuator. Determining the initial value of the programmable attenuator requires consideration of different veneers and corresponding test data. This means that in a specific embodiment, the appropriate initial values are obtained by test or simulation methods, etc. according to the characteristics and requirements of the system and the results of the actual test and calibration. The process of determining the initial value generally comprises the steps of: and (3) system analysis: for a particular base station or small base station system, the structure of the system, the operating frequency range, the characteristics of the power amplifier, etc. are known. Test data collection: through testing, input signal and output signal data of the system under different conditions are obtained. Data analysis: and analyzing the test data to know the working conditions of the system under different conditions, including the amplitude range of the input signal, the dynamic range of the power amplifier and the like. Initial value determination: based on the results of the data analysis, in combination with system requirements and considerations for protecting the power amplifier, an appropriate initial value is determined to ensure that the amount of attenuation of the controlled attenuator is appropriate at the beginning of the operation. It should be noted that the determination of the initial value may involve a certain trial and error process. Through practical testing and verification, the initial values can be adjusted step by step to achieve the best balance of system performance and protection power amplifier. Thus, in these embodiments, the determination of the initial value of the programmer is based on a process of system analysis, test data analysis, and actual verification to ensure that the appropriate amount of attenuation is given at the beginning of the operation to avoid damage to the power amplifier.
In some embodiments of the application, the method further comprises: and when the running center frequency of the RU equipment is not in the center frequency range of the calibration data, performing frequency compensation on the RU equipment by a difference method. The calibration data includes a plurality of preset center frequency points for calibration. However, since a wider frequency range may be involved in actual operation, there may be some cases where the center frequency is not within the calibration data range. To cope with this, a difference method is used for frequency compensation. The difference method calculates the calibration data of the actual working center frequency by linear interpolation or other interpolation algorithms based on the known center frequency point in the calibration data and the corresponding calibration data. Specifically, by performing interpolation calculation on the calibration data, the calibration data closest to the actual operation center frequency can be obtained. In this way, subsequent calibration operations can be performed using the compensated calibration data to ensure accuracy and stability at different center frequencies. The advantage of using the difference method for frequency compensation is that the coverage of the calibration data can be extended, making it suitable for a wider range of operating frequencies. By calculating the compensation value according to the position of the actual operating center frequency, the downlink gain of the RU device can be more accurately calibrated and a stable output signal can be provided. Thus, in these embodiments, frequency compensation by the difference method is performed to handle cases where the actual operating center frequency is not within the calibration data range to provide accurate calibration data and stable system performance.
An RU apparatus as described in fig. 2, the RU apparatus comprising:
and the RU equipment signal input module is used for acquiring RU equipment input signals and sending input digital signals obtained by processing the RU equipment input signals through the data processing unit to the loop gain module. The RU equipment input signal is an IQ input signal and enters a data processing unit in the FPGA chip, the data processing unit comprises an IFFT and the like, and the processed input digital signal is sent to a loop gain control unit.
The loop gain module is used for acquiring the input digital signal, processing the input digital signal to obtain loop gain of RU equipment; the loop gain module includes: the loop gain control unit, the ADC digital-to-analog conversion unit, the modulation unit, the program-controlled attenuator, the power amplifier, the coupler, the demodulation unit and the DAC analog-to-digital conversion unit form a closed loop. The loop gain control unit acquires the input digital signal, and the input digital signal returns to the loop gain control unit after the loop gain of the RU equipment is acquired through the closed loop; and the loop gain control unit controls the program-controlled attenuator according to the loop gain of the RU equipment so as to control the downlink gain of the RU equipment.
And the RU equipment signal output module comprises an antenna port for outputting an RU equipment output signal according to the RU equipment loop gain.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the apparatus claims can also be implemented by means of one unit or means in software or hardware. The terms first, second, etc. are used to denote a name, but not any particular order.

Claims (10)

1. A method for calibrating downlink gain of RU equipment, the method comprising:
acquiring an RU input signal, and processing the RU input signal to obtain an input digital signal; performing loop gain processing on the input digital signal to obtain a feedback signal, and obtaining loop gain of RU equipment according to the input digital signal and the feedback signal;
according to the loop gain of the RU equipment, controlling the output of an antenna port of the RU equipment to obtain an RU equipment output signal; obtaining the downlink gain of the RU equipment according to the RU equipment input signal and the RU equipment output signal;
changing the central frequency of the RU equipment according to the loop gain of the RU equipment and the output signal of the RU equipment to obtain calibration data; and calibrating the downlink gain of the RU equipment according to the calibration data.
2. The method of claim 1, wherein the obtaining RU device loop gain comprises:
the sequence length of the input digital signal is N, each number in the sequence is complex, the input digital signal comprises an I item and a Q item, the I item and the Q item are m bit signed numbers, and the full scale decibel value P of the input digital signal In The calculation is carried out to obtain:
the feedback signal has a sequence length of N, each number in the sequence is complex, the sequence comprises an I item and a Q item, the I item and the Q item are x bit signed numbers, and the feedback signal has a full-scale decibel value P Orx The calculation is carried out to obtain:
the loop Gain Loop The calculation is carried out to obtain:
Gain Loop ＝P Orx -P In 。
3. the method of claim 1, wherein the obtaining the RU downlink gain comprises:
the RU device input signal is set to P IQ_IN The unit is dBFS; the RU device output signal is set to P Out The unit is dBm, and the RU equipment performs downlink Gain RU_DL The method comprises the following steps:
Gain RU_DL ＝P Out -P IQ_IN 。
4. the method according to claim 2, wherein the obtaining calibration data comprises the steps of:
s1, controlling a program-controlled attenuator through a loop Gain control module of the RU equipment to control the loop Gain of the RU equipment to two different values Gain Loop1 And Gain Loop2 Record the RU device output signal at this timeP Out1 And P Out2 Simultaneously recording RU device input signal P IQ_IN Establishing a corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment;
s2, changing the central frequency of the RU equipment, and repeating the step S1 under a plurality of central frequencies to obtain the corresponding relation between the loop gain of the RU equipment and the output signal of the RU equipment under different central frequencies, wherein the corresponding relation is used as the calibration data.
5. The method of claim 4, wherein calibrating the RU downlink gain comprises:
at a first center frequency F 0 Determining target downlink Gain of RU equipment RU_DL-target According to the target downlink Gain of the RU equipment, the target loop Gain of the RU equipment is calculated Loop-target And (3) performing calculation:
that is, the RU device loop Gain is controlled to Gain Loop-target Obtaining target downlink Gain of RU equipment RU_DL-target 。
6. The method according to any one of claims 1-5, further comprising:
when the downlink gain of the RU equipment does not reach the target downlink gain of the RU equipment, calculating the loop gain of the RU equipment by adopting a first calculation frequency;
and when the RU equipment downlink gain reaches the RU equipment target downlink gain, calculating the RU equipment loop gain by adopting a second calculation frequency.
7. The method according to any one of claims 1-5, further comprising:
and when the running center frequency of the RU equipment is not in the center frequency range of the calibration data, performing frequency compensation on the RU equipment by a difference method.
8. An RU apparatus, the apparatus comprising:
the RU equipment signal input module is used for acquiring RU equipment input signals and sending input digital signals obtained by processing the RU equipment input signals to the loop gain module;
the loop gain module is used for acquiring the input digital signal, processing the input digital signal to obtain loop gain of RU equipment;
and the RU equipment signal output module is used for outputting an RU equipment output signal according to the RU equipment loop gain.
9. The apparatus of claim 8, wherein the loop gain module comprises:
the loop gain control unit, the ADC digital-to-analog conversion unit, the modulation unit, the program-controlled attenuator, the power amplifier, the coupler, the demodulation unit and the DAC analog-to-digital conversion unit form a closed loop.
10. The apparatus of claim 9, wherein the loop gain control unit obtains the input digital signal, and wherein the input digital signal is returned to the loop gain control unit after passing through the closed loop to obtain RU device loop gain;
and the loop gain control unit controls the program-controlled attenuator according to the loop gain of the RU equipment so as to control the downlink gain of the RU equipment.
CN202310887009.8A 2023-07-19 2023-07-19 RU equipment downlink gain calibration method and RU equipment Pending CN116961785A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310887009.8A CN116961785A (en) 2023-07-19 2023-07-19 RU equipment downlink gain calibration method and RU equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310887009.8A CN116961785A (en) 2023-07-19 2023-07-19 RU equipment downlink gain calibration method and RU equipment

Publications (1)

Publication Number Publication Date
CN116961785A true CN116961785A (en) 2023-10-27

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Application Number Title Priority Date Filing Date
CN202310887009.8A Pending CN116961785A (en) 2023-07-19 2023-07-19 RU equipment downlink gain calibration method and RU equipment

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