Method for adjusting the output impedance of a radio remote unit device

Abstract

This application relates to a method for adjusting the output impedance of a radio frequency (RF) remote unit device. The method includes: with the RF remote unit device operating at nominal full power, determining the expected reflected power based on the VSWR (Standing Wave Ratio) of the mismatched load connected to the output of the RF remote unit device and the rated transmit power; converting the power amplifier reflected signal of the RF remote unit device into a digital signal based on the feedback channel of the attenuator, the RF reflection link, and the radio transceiver; acquiring the digital signal through a field-programmable gate array (FPGA) using the high-speed serial interface of the RF remote unit device; determining the initial actual reflected power based on the digital signal using the FPGA; and adjusting the capacitor control voltage of a voltage-controlled capacitor according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit device. This solution saves on manufacturing costs for mass production of the equipment and improves equipment stability.

Description

Technical Field

[0001] This application relates to the field of radio frequency remote unit equipment technology, and in particular to a method for adjusting the output impedance of a radio frequency remote unit equipment. Background Technology

[0002] The power amplifier output of a radio frequency remote unit (RU) typically has three capacitors connected in parallel to ground. Currently, when controlling the VSWR of the RU output, technicians use a vector network analyzer to test the VSWR. If the measured VSWR is too high, the capacitance values ​​of the three capacitors connected in parallel to ground can be adjusted to optimize the matching at the power amplifier output and thus improve the VSWR. Traditional RU output VSWR control largely depends on the 50-ohm impedance matching at the output during mass production, and the capacitors at the output are fixed values ​​derived from previous testing. However, due to process variations during PCB (Printed Circuit Board) assembly or batch differences in resistors and capacitors, the 50-ohm impedance at the RU power amplifier output may vary, leading to poor impedance matching and a high VSWR. Therefore, to address batch differences during mass production, significant manpower and resources are required for maintenance and debugging during RU mass production. If not handled properly, during the use of RU equipment, the output power may be reflected back to the power amplifier due to the 50-ohm impedance mismatch at the output end, potentially causing the power amplifier to burn out. Therefore, how to solve the problem of poor impedance matching at the output end of RU equipment caused by mass production inconsistencies is a topic that needs to be studied. Summary of the Invention

[0003] Therefore, it is necessary to provide a method for adjusting the output impedance of a radio frequency remote unit device that can improve the impedance matching degree of the RU device, enhance device stability, and increase device production efficiency, in order to address the aforementioned technical problems.

[0004] In a first aspect, this application provides a method for adjusting the output impedance of a radio frequency remote unit device, the method comprising:

[0005] Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device;

[0006] Obtain the initial actual reflected power of the radio frequency remote unit device;

[0007] Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

[0008] In one embodiment, the method further includes:

[0009] The calibrated transmit power of the radio frequency remote unit device is determined using a spectrum analyzer.

[0010] Based on the fixed VSWR of the mismatched load and the calibrated transmit power, the expected reflected power of the radio frequency remote unit device is determined.

[0011] In one embodiment, the fixed VSWR of the mismatched load is 2.0.

[0012] In one embodiment, adjusting the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device based on the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit device, includes:

[0013] Calculate the initial power difference between the expected reflected power and the initial actual reflected power;

[0014] If the initial power difference is greater than a preset difference threshold, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

[0015] In one embodiment, adjusting the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device to adjust the output impedance of the radio frequency remote unit device includes: the radio frequency remote unit device includes a first voltage-controlled capacitor, a second voltage-controlled capacitor, and a third voltage-controlled capacitor;

[0016] The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted; thereby adjusting the output impedance of the radio frequency remote unit device.

[0017] In one embodiment, the third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted; and the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted; thereby adjusting the output impedance of the radio frequency remote unit device, including:

[0018] The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0019] The second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0020] The first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0021] After each adjustment of the third control voltage, the second control voltage, or the first control voltage, the updated actual reflected power of the radio frequency remote unit device is obtained;

[0022] Determine whether the updated power difference between the updated actual reflection power and the expected reflection power is less than a preset difference threshold;

[0023] If the updated power difference is less than or equal to the difference threshold, the adjusted third control voltage, second control voltage, and first control voltage are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0024] In one embodiment, the method further includes:

[0025] If the power difference after each adjustment is greater than the preset difference threshold;

[0026] Then determine the minimum power difference of the updated power difference after each adjustment;

[0027] The third control voltage, the second control voltage, and the first control voltage corresponding to the minimum power difference are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0028] Secondly, this application also provides an impedance adjustment device for the output terminal of a radio frequency remote unit device, the device comprising:

[0029] The expected reflection power determination module is used to obtain the expected reflection power of the radio frequency remote unit device; the expected reflection power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device.

[0030] The actual reflected power determination module is used to obtain the initial actual reflected power of the radio frequency remote unit device;

[0031] The voltage adjustment module is used to adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the radio frequency remote unit device.

[0032] Thirdly, this application also provides a computer device, the computer device including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0033] Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device;

[0034] Obtain the initial actual reflected power of the radio frequency remote unit device;

[0035] Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

[0036] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0037] Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device;

[0038] Obtain the initial actual reflected power of the radio frequency remote unit device;

[0039] Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

[0040] The above-described method for adjusting the output impedance of a radio frequency (RF) remote unit device involves obtaining the expected reflected power of the RF remote unit device. The expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the RF remote unit device. The method also involves obtaining the initial actual reflected power of the RF remote unit device. Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device is adjusted, thereby adjusting the output impedance of the RF remote unit device. This method solves the problems of poor output impedance matching, poor equipment stability, and low production efficiency of RU equipment caused by mass production inconsistencies. The above solution allows the RF remote unit (RU) to determine the expected reflected power based on the VSWR (Standing Wave Ratio) of the mismatched load connected to the RF RU's output terminal and the rated transmit power, under nominal full-power output conditions. Based on the feedback channels of the attenuator, RF reflection link, and radio transceiver, the power amplifier reflected signal of the RF RU is converted into a digital signal. The digital signal is acquired via a field-programmable gate array (FPGA) using the RF RU's high-speed serial interface. The initial actual reflected power is determined based on the acquired digital signal using the FPGA. Finally, the voltage control voltage of the voltage-controlled capacitor at the RF RU's power amplifier output terminal is adjusted using the FPGA, based on the expected and initial actual reflected power, thereby adjusting the RF RU's output impedance. This solution resolves the consistency issue in mass production of RU equipment, improves production efficiency, saves manufacturing costs, and enhances equipment stability. Attached Figure Description

[0041] Figure 1 Here is an example diagram of the device structure of the RU device in one embodiment;

[0042] Figure 2 Here is an example diagram of the hardware structure of the RU device in one embodiment;

[0043] Figure 3 This is a flowchart illustrating a method for adjusting the output impedance of a radio frequency remote unit device in one embodiment.

[0044] Figure 4 A diagram illustrating the device connection method for testing the output power of a RU device;

[0045] Figure 5 This is a hardware connection example diagram corresponding to the automatic impedance matching method at the output terminal of the RU device in one embodiment;

[0046] Figure 6 This is a structural block diagram of an impedance adjustment device at the output terminal of a radio frequency remote unit device in one embodiment;

[0047] Figure 7This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] It should be noted that the equipment structure of traditional RU equipment is as follows: Figure 1 As shown, the RU device's structure comprises a Field-Programmable Gate Array (FPGA), a high-speed serial interface (JESD), a transceiver (Transceiver), a power amplifier (PA), an ARM processor, and a vector network analyzer. The FPGA performs data conversion, processing, and calculation on the data generated during RU operation. Through the JESD interface and the Transceiver, the FPGA can obtain the transmit and receive power outputs of the RU's power amplifier. The Transceiver is a communication device integrating radio transmission and reception functions, achieving signal transmission and reception through shared circuitry. The FPGA and Transceiver in the RU device are connected to the ARM via SPI (Serial Peripheral Interface). The ARM core is primarily used for real-time baseband processing, digital signal processing control and scheduling, and device management and maintenance. The Transceiver sends communication signals to the PA via a downlink RF link and receives feedback communication signals from the PA via a reflected power RF link. The PA typically contains three voltage-controlled capacitors; the control voltage of these capacitors can be set according to actual needs. The PA is connected to the vector network analyzer via RF cables. A vector network analyzer is a precision electronic instrument used to test and characterize the performance of radio frequency components, circuits, and systems.

[0050] In this solution, the hardware structure of the RU device is as follows: Figure 2As shown in the diagram. Here, 1 refers to the voltage-controlled capacitor connected to one digital-to-analog converter (DAC), 2 refers to the voltage-controlled capacitor connected to two DACs, and 3 refers to the voltage-controlled capacitor connected to three DACs. The FPGA has a three-channel DAC (Digital-to-Analog Converter). The DAC is connected to the three voltage-controlled capacitors in the PA (Power Amplifier). The FPGA can determine the control voltage of the voltage-controlled capacitors based on an automatic impedance matching algorithm and control the capacitance values ​​of the three voltage-controlled capacitors at the output of the RU (Remote Utilization Unit) power amplifier through the DAC. The PA is connected to a mismatched load via an RF cable. A mismatched load is a terminating load whose characteristic impedance is not equal to the system characteristic impedance. When a mismatched load is connected to the end of a transmission line, it completely absorbs all incident power from the signal source without any reflection, and the voltage standing wave ratio (VSWR) of the mismatched load is greater than 1.

[0051] In one embodiment, such as Figure 3 As shown, a method for adjusting the output impedance of a radio frequency remote unit device is provided. This method can also be applied to servers, and to systems including terminals and servers, and is implemented through interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0052] S110, Obtain the expected reflected power of the radio frequency remote unit device.

[0053] The expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the RF remote unit device.

[0054] For example, the rated transmit power of the radio frequency remote unit device is calibrated using a spectrum analyzer; the expected reflected power of the radio frequency remote unit device is determined based on the fixed VSWR of the mismatched load and the rated transmit power.

[0055] A mismatched load is a device used in microwave or radio frequency systems to simulate specific reflection conditions. It tests the performance of a device under mismatched conditions by absorbing and reflecting a portion of the microwave power. The standing wave ratio (VSWR) of a mismatched load is typically greater than 1, with the specific value depending on the degree of impedance mismatch. A VSWR of 1 indicates perfect matching, while infinity indicates total reflection. The VSWR is the ratio of the voltage amplitude at the antinode to the voltage amplitude at the trough of a transmission line. Reflected power refers to the portion of the incident power that is not absorbed by the load and is consumed in the output circuit of the device when the load and device are not ideally matched.

[0056] Specifically, when the radio frequency remote unit device is operating at its nominal full power output, the expected reflected power is determined based on the VSWR of the mismatched load connected to the output terminal of the radio frequency remote unit device and the rated transmit power. For example, the expected reflected power can be calculated according to formula (1).

[0057] (1).

[0058] VSWR refers to the standing wave ratio of the mismatched load connected to the output of the radio frequency remote unit device. It can be set according to actual needs, and the calibrated transmit power can be 50dBm (100W).

[0059] For example, the fixed VSWR of a mismatched load is 2.0.

[0060] When the fixed VSWR of the mismatched load is 2.0, assuming that the 50-ohm impedance matching at the output of the RU device is very good, the expected reflected power calculated according to formula (1) is 40.5 dBm (11.1 W).

[0061] S120, Obtain the initial actual reflected power of the radio frequency remote unit device.

[0062] Based on the attenuator, RF reflection link, and feedback channel of the radio transceiver, the power amplifier reflected signal of the RF remote unit is converted into a digital signal. The digital signal is then acquired via the high-speed serial interface of the RF remote unit using an FPGA. Finally, the initial actual reflected power is determined based on the acquired digital signal using the FPGA.

[0063] It should be noted that the RF reflected signal from the RU device's power amplifier output passes through an attenuator with a fixed attenuation value and is converted into a digital signal via the RF reflection link and the Transceiverr feedback channel. The FPGA can then use the RU device's high-speed serial interface to calculate the actual reflected signal power value based on the acquired digital signal. This calculated power value is used as the initial actual reflected power.

[0064] S130. Based on the expected reflected power and the initial actual reflected power, adjust the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device, thereby adjusting the output impedance of the RF remote unit device.

[0065] Specifically, using the FPGA, the voltage control voltage of the voltage-controlled capacitor at the output of the power amplifier of the RF remote unit is adjusted based on the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit.

[0066] In the above-described method for adjusting the output impedance of the RF remote unit device, the expected reflected power of the RF remote unit device is obtained; the expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the RF remote unit device; the initial actual reflected power of the RF remote unit device is obtained; and the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device is adjusted according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit device. This method solves the problems of poor output impedance matching, poor equipment stability, and low equipment production efficiency of RU equipment caused by mass production consistency issues during RU equipment manufacturing. The above solution allows the RF remote unit (RU) to determine the expected reflected power based on the VSWR (Standing Wave Ratio) of the mismatched load connected to the RF RU's output terminal and the rated transmit power, under nominal full-power output conditions. Based on the feedback channels of the attenuator, RF reflection link, and radio transceiver, the power amplifier reflected signal of the RF RU is converted into a digital signal. The digital signal is acquired via a field-programmable gate array (FPGA) using the RF RU's high-speed serial interface. The initial actual reflected power is determined based on the acquired digital signal using the FPGA. Finally, the voltage control voltage of the voltage-controlled capacitor at the RF RU's power amplifier output terminal is adjusted using the FPGA, based on the expected and initial actual reflected power, thereby adjusting the RF RU's output impedance. This solution resolves the consistency issue in mass production of RU equipment, improves production efficiency, saves manufacturing costs, and enhances equipment stability.

[0067] In one embodiment, adjusting the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device based on the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit device, includes:

[0068] Calculate the initial power difference between the expected reflected power and the initial actual reflected power; determine whether the initial power difference is greater than a preset difference threshold; if so, adjust the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device, thereby adjusting the output impedance of the RF remote unit device.

[0069] Specifically, the FPGA is used to calculate the initial power difference between the expected reflected power and the initial actual reflected power; it is then determined whether the initial power difference is greater than a preset difference threshold. If so, the field-programmable gate array is used to adjust the capacitor control voltage of the voltage-controlled capacitor at the output of the power amplifier of the RF remote unit device, thereby adjusting the output impedance of the RF remote unit device.

[0070] The difference threshold can be set according to actual needs.

[0071] For example, the field-programmable gate array is connected to three voltage-controlled capacitors at the output of the power amplifier of the radio frequency remote unit device via a three-way digital-to-analog converter.

[0072] For example, adjusting the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device to adjust the output impedance of the radio frequency remote unit device includes: the radio frequency remote unit device includes a first voltage-controlled capacitor, a second voltage-controlled capacitor and a third voltage-controlled capacitor;

[0073] The third control voltage of the third voltage-controlled capacitor of the RF remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the RF remote unit device is adjusted; the first control voltage of the first voltage-controlled capacitor of the RF remote unit device is adjusted; thereby adjusting the output impedance of the RF remote unit device.

[0074] Specifically, using an FPGA, based on a preset voltage adjustment sequence, the capacitor control voltage of the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is adjusted, thereby adjusting the output impedance of the RF remote unit device. The capacitor control voltage includes: a first control voltage for the first voltage-controlled capacitor corresponding to one digital-to-analog converter, a second control voltage for the second voltage-controlled capacitor corresponding to two digital-to-analog converters, and a third control voltage for the third voltage-controlled capacitor corresponding to three digital-to-analog converters. The preset voltage adjustment sequence is: first adjust the third control voltage, then adjust the second control voltage, and finally adjust the first control voltage.

[0075] Using an FPGA, based on a preset voltage adjustment sequence, the capacitor control voltage of the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is adjusted, thereby adjusting the output impedance of the RF remote unit device. The capacitor control voltage includes: the first control voltage of the first voltage-controlled capacitor corresponding to one digital-to-analog converter, the second control voltage of the second voltage-controlled capacitor corresponding to two digital-to-analog converters, and the third control voltage of the third voltage-controlled capacitor corresponding to three digital-to-analog converters. The preset voltage adjustment sequence is: first adjust the third control voltage, then adjust the second control voltage, and finally adjust the first control voltage.

[0076] Specifically, if the initial power difference between the expected reflected power and the initial actual reflected power exceeds a preset difference threshold, the voltage control voltage will be adjusted in the following order: first the third control voltage, then the second control voltage, and finally the first control voltage. This adjustment applies to the first control voltage corresponding to one digital-to-analog converter, the second control voltage corresponding to two digital-to-analog converters, and the third control voltage corresponding to three digital-to-analog converters, thus controlling the voltage-controlled capacitor's capacitance. The voltage range for adjusting the control voltages (Digital-to-Analog Converters) corresponding to the three FPGA DACs is between 0 and 5V. Each adjustment can be 0.2V; that is, the first adjustment can be to 0.2V, the second to 0.4V, and so on, up to a maximum of 5V. When the voltage control voltage of the voltage-controlled capacitor at the power amplifier output of the RF remote unit changes, the capacitance value of the voltage-controlled capacitor also changes, thereby altering the 50-ohm impedance matching at the power amplifier output.

[0077] The above solution can automatically adjust the voltage control voltage of the voltage-controlled capacitor at the output of the power amplifier of the RF remote unit device based on a preset voltage adjustment sequence using an FPGA. This allows for adjustment of the capacitance value of the voltage-controlled capacitor, thereby changing the 50-ohm impedance matching at the amplifier output. This achieves automated adjustment of the impedance at the output of the RF remote unit device and improves the stability of the device.

[0078] For example, the third control voltage of the third voltage-controlled capacitor of the RF remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the RF remote unit device is adjusted; and the first control voltage of the first voltage-controlled capacitor of the RF remote unit device is adjusted; thereby adjusting the output impedance of the RF remote unit device, including:

[0079] The third control voltage of the third voltage-controlled capacitor of the RF remote unit device is adjusted by a preset step size; the second control voltage of the second voltage-controlled capacitor of the RF remote unit device is adjusted by a preset step size; the first control voltage of the first voltage-controlled capacitor of the RF remote unit device is adjusted by a preset step size; after each adjustment of the third, second, or first control voltage, the updated actual reflected power of the RF remote unit device is obtained; it is determined whether the updated power difference between the updated actual reflected power and the expected reflected power is less than a preset difference threshold; if the updated power difference is less than or equal to the difference threshold, the adjusted third, second, and first control voltages are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0080] The preset step size can be set according to actual needs; for example, the preset step size can be 0.2V.

[0081] For example, an FPGA has a three-channel DAC connected to three voltage-controlled capacitors at the output of the RU device's power amplifier. The FPGA calculates the initial power difference between the expected reflected power and the initial actual reflected power. If the initial power difference does not meet the allowable difference between the actual and expected reflected power values, the FPGA adjusts the capacitor control voltage at the output of the RF remote unit device's power amplifier in the following order: first, adjust the third control voltage of the third voltage-controlled capacitor; then, adjust the second control voltage of the second voltage-controlled capacitor; and finally, adjust the first control voltage of the first voltage-controlled capacitor. When adjusting the capacitor control voltage at the output of the RF remote unit device's power amplifier, the adjustment proceeds from small to large according to a pre-set single-adjustment accuracy value. The voltage range for the three DAC channels adjusted by the FPGA is 0-5V. As the three voltage values ​​of the DAC change, the capacitance of the voltage-controlled capacitor at the output changes, thereby altering the 50-ohm impedance matching at the power amplifier output.

[0082] The above scheme, after adjusting the capacitor control voltage of the voltage-controlled capacitor at the power amplifier output of the RF remote unit device, recalculates the actual reflected power at the power amplifier output of the RU device based on the adjusted capacitor control voltage, and determines whether the output impedance of the RF remote unit device has been adjusted based on the recalculated actual reflected power, thus ensuring the stability of the RU device.

[0083] For example, based on the above embodiments, the method for adjusting the output impedance of the radio frequency remote unit device includes:

[0084] If the updated power difference after each adjustment is greater than the preset difference threshold, then determine the minimum power difference after each adjustment; save the third control voltage, the second control voltage, and the first control voltage corresponding to the minimum power difference, so as to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0085] For example, if the three voltage values ​​of the DAC have been adjusted to 5V, and the power difference between the actual reflected power value and the expected reflected power value of the RU device corresponding to the capacitor control voltage after each adjustment is greater than the preset difference threshold, then the power value closest to the expected reflected power can be determined from the actual reflected power calculated during the capacitor control voltage adjustment process as the target reflected power, and the third control voltage, the second control voltage and the first control voltage corresponding to the minimum power difference can be saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output terminal of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0086] The above scheme can determine the optimal method for adjusting the output impedance of the RF remote unit based on the updated power difference after each adjustment, thus improving the flexibility of adjusting the output impedance of the RF remote unit.

[0087] For example, based on the above embodiments, the method for adjusting the output impedance of the radio frequency remote unit device includes:

[0088] Figure 4 This diagram illustrates the device connection method for testing the output power of the RU device. Figure 4 The hardware connection scheme connects the signal source, AU (Antenna Unit, wireless network device), RU device, and spectrum analyzer. The RU device operates at its nominal full power output, with a nominal power of 100W and a nominal full power output of 50dBm (100W).

[0089] Figure 5 This is an example of the hardware connection for the automatic impedance matching method at the output of the RU device. With the RU device outputting at its nominal full power, a mismatched load with a VSWR of 2.0 is connected to the output. The rated transmit power of the RU device is determined to be 50 dBm (100 W). Assuming that the 50-ohm impedance matching at the output of the RU device is good, the expected reflected power of the RU device is calculated based on formula (1). The RF reflected signal from the RU device's power amplifier passes through an attenuator with a fixed attenuation value, and then through the RF reflection link and the feedback channel of Transceiverr, is converted into a digital signal. The FPGA acquires the above digital signal based on the high-speed serial interface JESD of the RF remote unit device. The FPGA calculates the actual reflected signal power value, i.e., the initial actual reflected power, based on the acquired digital signal.

[0090] The FPGA has a three-channel DAC, each connected to one of the three voltage-controlled capacitors at the output of the RU device's power amplifier. The FPGA calculates the initial power difference between the expected reflected power and the initial actual reflected power. If this initial power difference does not meet the allowable difference between the actual and expected reflected power values, the FPGA adjusts the capacitor control voltage at the RF remote unit device's power amplifier output in the following order: first, adjust the voltage value of the third FPGA_DAC channel, then the second FPGA_DAC channel, and finally the first FPGA_DAC channel. When adjusting the capacitor control voltage at the RF remote unit device's power amplifier output, the adjustment proceeds from small to large according to a pre-set single-adjustment accuracy value. The voltage range for the three FPGA DAC channels is 0-5V. As the three DAC voltage values ​​change, the capacitance of the output voltage-controlled capacitors changes, thus altering the 50-ohm impedance matching at the power amplifier output. Improved impedance matching directly feeds back to the actual reflected power value acquired by the FPGA. The FPGA then modifies the voltage according to the adjustment algorithm based on the acquired actual reflected power value, thus implementing a closed-loop adjustment strategy.

[0091] After each adjustment of the three voltage values ​​of the DAC by the FPGA, the power difference between the actual reflected power value and the expected reflected power value of the RU device is calculated. This process continues until the power difference between the actual reflected power value and the expected reflected power value of the RU device meets the allowable difference between the actual reflected power value and the expected reflected power value. Then, the adjusted three voltage values ​​are saved, which means the adjusted capacitor control voltage is saved. This ensures that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0092] For example, if the three voltage values ​​of the DAC have been adjusted to 5V, and the power difference between the actual reflected power value and the expected reflected power value of the RU device corresponding to the adjusted capacitor control voltage does not meet the allowable difference between the actual reflected power value and the expected reflected power value, then the power value closest to the expected reflected power can be determined from the actual reflected power calculated during the capacitor control voltage adjustment process as the target reflected power. The adjusted capacitor control voltage corresponding to the target reflected power is then stored in EEPROM (Electrically Erasable Programmable Read Only Memory) as the adjusted voltage values ​​of the first, second, and third channels of the FPGA_DAC, respectively. This ensures that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0093] For example, if the three voltage values ​​of the DAC have been adjusted to 5V, and the power difference between the actual reflected power value and the expected reflected power value of the RU device corresponding to the capacitor control voltage after each adjustment does not meet the allowable difference between the actual reflected power value and the expected reflected power value, the output VSWR value of the RU device can be queried to determine whether the output VSWR value of the RU device meets the factory qualification standard. If the output VSWR value of the RU device does not meet the factory qualification standard, it is necessary to further investigate the hardware problems of the RU device and recalibrate it.

[0094] For RU devices already in use, the above solution can be applied to adjust the output impedance of the RU device by adjusting the voltage values ​​of FPGA_DAC channel 1, FPGA_DAC channel 2, and FPGA_DAC channel 3, thereby stabilizing the RU device's VSWR at a normal value. This eliminates the need to return the RU device to the factory for hardware repair when the VSWR is abnormal, resolving engineering application problems related to abnormal VSWR and saving on RU device maintenance costs.

[0095] The above solution obtains the expected reflected power of the RF remote unit device; the expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the RF remote unit device; the initial actual reflected power of the RF remote unit device is obtained; based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device is adjusted, thereby adjusting the output impedance of the RF remote unit device. This solves the problems of poor output impedance matching, poor equipment stability, and low equipment production efficiency of RU equipment caused by mass production consistency issues. The above solution allows the RF remote unit (RU) to determine the expected reflected power based on the VSWR (Standing Wave Ratio) of the mismatched load connected to the RF RU's output terminal and the rated transmit power, under nominal full-power output conditions. Based on the feedback channels of the attenuator, RF reflection link, and radio transceiver, the power amplifier reflected signal of the RF RU is converted into a digital signal. The digital signal is acquired via a field-programmable gate array (FPGA) using the RF RU's high-speed serial interface. The initial actual reflected power is determined based on the acquired digital signal using the FPGA. Finally, the voltage control voltage of the voltage-controlled capacitor at the RF RU's power amplifier output terminal is adjusted using the FPGA, based on the expected and initial actual reflected power, thereby adjusting the RF RU's output impedance. This solution resolves the consistency issue in mass production of RU equipment, improves production efficiency, saves manufacturing costs, and enhances equipment stability.

[0096] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0097] Based on the same inventive concept, this application also provides an apparatus for adjusting the output impedance of a radio frequency remote unit device to implement the above-described method for adjusting the output impedance of a radio frequency remote unit device. The solution provided by this apparatus is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the apparatus for adjusting the output impedance of a radio frequency remote unit device provided below can be found in the limitations of the method for adjusting the output impedance of a radio frequency remote unit device described above, and will not be repeated here.

[0098] In one embodiment, such as Figure 6 As shown, an adjustment device for the output impedance of a radio frequency remote unit device is provided. The adjustment device includes: a expected reflected power determination module 601, an actual reflected power determination module 602, and a voltage adjustment module 603, wherein:

[0099] The expected reflection power determination module 601 is used to obtain the expected reflection power of the radio frequency remote unit device; the expected reflection power is determined based on the fixed standing wave ratio of the mismatched load and the calibrated transmit power of the radio frequency remote unit device.

[0100] The actual reflection power determination module 602 is used to obtain the initial actual reflection power of the radio frequency remote unit device;

[0101] The voltage adjustment module 603 is used to adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the radio frequency remote unit device.

[0102] For example, the expected reflection power determination module 601 is further specifically used for:

[0103] The calibrated transmit power of the radio frequency remote unit device is determined using a spectrum analyzer.

[0104] Based on the fixed VSWR of the mismatched load and the calibrated transmit power, the expected reflected power of the radio frequency remote unit device is determined.

[0105] For example, the fixed VSWR of the mismatched load is 2.0.

[0106] For example, the voltage adjustment module 603 is also specifically used for:

[0107] Calculate the initial power difference between the expected reflected power and the initial actual reflected power;

[0108] If the initial power difference is greater than a preset difference threshold, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

[0109] For example, adjusting the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device to adjust the output impedance of the radio frequency remote unit device includes: the radio frequency remote unit device includes a first voltage-controlled capacitor, a second voltage-controlled capacitor and a third voltage-controlled capacitor;

[0110] The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted; thereby adjusting the output impedance of the radio frequency remote unit device.

[0111] For example, the third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted; and the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted; thereby adjusting the output impedance of the radio frequency remote unit device, including:

[0112] The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0113] The second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0114] The first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size;

[0115] After each adjustment of the third control voltage, the second control voltage, or the first control voltage, the updated actual reflected power of the radio frequency remote unit device is obtained;

[0116] Determine whether the updated power difference between the updated actual reflection power and the expected reflection power is less than a preset difference threshold;

[0117] If the updated power difference is less than or equal to the difference threshold, the adjusted third control voltage, second control voltage, and first control voltage are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0118] For example, if the updated power difference after each adjustment is greater than a preset difference threshold;

[0119] Then determine the minimum power difference of the updated power difference after each adjustment;

[0120] The third control voltage, the second control voltage, and the first control voltage corresponding to the minimum power difference are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

[0121] Each module in the aforementioned RF remote unit impedance adjustment device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware within or independently of the processor in a computer device, or stored in software within the computer device's memory, so that the processor can call and execute the corresponding operations of each module.

[0122] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 7As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for adjusting the output impedance of a radio frequency remote unit device. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0123] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0124] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0125] Step 1: Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the radio frequency remote unit device.

[0126] Step 2: Obtain the initial actual reflected power of the radio frequency remote unit device;

[0127] Step 3: Based on the expected reflected power and the initial actual reflected power, adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device, thereby adjusting the output impedance of the radio frequency remote unit device.

[0128] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0129] Step 1: Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the radio frequency remote unit device.

[0130] Step 2: Obtain the initial actual reflected power of the radio frequency remote unit device;

[0131] Step 3: Based on the expected reflected power and the initial actual reflected power, adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device, thereby adjusting the output impedance of the radio frequency remote unit device.

[0132] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0133] Step 1: Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed VSWR of the mismatched load and the rated transmit power of the radio frequency remote unit device.

[0134] Step 2: Obtain the initial actual reflected power of the radio frequency remote unit device;

[0135] Step 3: Based on the expected reflected power and the initial actual reflected power, adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device, thereby adjusting the output impedance of the radio frequency remote unit device.

[0136] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0137] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0138] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0139] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for adjusting the output impedance of a radio frequency remote unit device, characterized in that, include: Obtain the expected reflected power of the radio frequency remote unit device; the expected reflected power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device; Obtain the initial actual reflected power of the radio frequency remote unit device; Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

2. The method according to claim 1, characterized in that, The method further includes: The calibrated transmit power of the radio frequency remote unit device is determined using a spectrum analyzer. Based on the fixed VSWR of the mismatched load and the calibrated transmit power, the expected reflected power of the radio frequency remote unit device is determined.

3. The method according to claim 2, characterized in that, The fixed VSWR of the mismatched load is 2.

0.

4. The method according to claim 1, characterized in that, Based on the expected reflected power and the initial actual reflected power, the capacitor control voltage of the voltage-controlled capacitor of the RF remote unit device is adjusted, thereby adjusting the output impedance of the RF remote unit device, including: Calculate the initial power difference between the expected reflected power and the initial actual reflected power; If the initial power difference is greater than a preset difference threshold, the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device is adjusted, thereby adjusting the output impedance of the radio frequency remote unit device.

5. The method according to claim 4, characterized in that, Adjusting the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device to adjust the output impedance of the radio frequency remote unit device includes: the radio frequency remote unit device includes a first voltage-controlled capacitor, a second voltage-controlled capacitor and a third voltage-controlled capacitor; The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted; thereby adjusting the output impedance of the radio frequency remote unit device.

6. The method according to claim 5, characterized in that, The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted; the second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted. Adjust the first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device; Adjusting the output impedance of the radio frequency remote unit device includes: The third control voltage of the third voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size; The second control voltage of the second voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size; The first control voltage of the first voltage-controlled capacitor of the radio frequency remote unit device is adjusted by a preset step size; After each adjustment of the third control voltage, the second control voltage, or the first control voltage, the updated actual reflected power of the radio frequency remote unit device is obtained; Determine whether the updated power difference between the updated actual reflection power and the expected reflection power is less than a preset difference threshold; If the updated power difference is less than or equal to the difference threshold, the adjusted third control voltage, second control voltage, and first control voltage are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

7. The method according to claim 6, characterized in that, Also includes: If the power difference after each adjustment is greater than the preset difference threshold; Then determine the minimum power difference of the updated power difference after each adjustment; The third control voltage, the second control voltage, and the first control voltage corresponding to the minimum power difference are saved to ensure that after the RF remote unit device restarts, the voltage-controlled capacitor at the power amplifier output of the RF remote unit device is controlled based on the adjusted capacitor control voltage.

8. A device for adjusting the output impedance of a radio frequency remote unit device, characterized in that, The device includes: The expected reflection power determination module is used to obtain the expected reflection power of the radio frequency remote unit device; the expected reflection power is determined based on the fixed standing wave ratio of the mismatched load and the rated transmit power of the radio frequency remote unit device. The actual reflected power determination module is used to obtain the initial actual reflected power of the radio frequency remote unit device; The voltage adjustment module is used to adjust the capacitor control voltage of the voltage-controlled capacitor of the radio frequency remote unit device according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the radio frequency remote unit device.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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