Radio frequency system, communication device, impedance adjustment method and readable storage medium

Abstract

The invention relates to a radio frequency system, communication equipment, an impedance adjusting method and a readable storage medium, the radio frequency system comprises a power amplification circuit, a power detection circuit, a tuning circuit and a processing circuit, the power detection circuit is used for coupling radio frequency signals and outputting forward coupling signals and reverse coupling signals; the processing circuit is configured to determine reflection characteristic parameters of the transmitting path according to the forward coupling signal and the reverse coupling signal; determining a real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load in the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal; tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position, so that the distance between the adjusted real-time impedance position and the target impedance position is smaller than the distance between the real-time impedance position and the target impedance position before adjustment. The radio frequency system can be adaptively adjusted in each operation scene, and the overall performance of the communication equipment is ensured.

Description

Technical Field

[0001] The present application relates to the field of radio frequency identification technology, and in particular to a radio frequency system, a communication device, an impedance adjustment method and a readable storage medium. Background Art

[0002] With the development of communication technology, communication devices such as smart phones can realize more and more functions, and the communication modes of communication devices are also more diversified. It is understandable that each communication mode of the communication device requires a corresponding antenna to support it.

[0003] At present, when the communication device is in special application scenarios, such as when a smartphone is in horizontal screen gaming, held in hand, or plugged into a USB for charging, the antenna of the communication device is affected by the human body or other metal objects, causing the communication performance of the communication device to be seriously affected. Summary of the invention

[0004] Based on this, it is necessary to provide a radio frequency system, communication equipment, impedance adjustment method and readable storage medium, so that the radio frequency system can adaptively adjust in various operating scenarios, optimize its own operating state, and thus ensure the communication performance of the communication equipment.

[0005] In a first aspect, the present application provides a radio frequency system, comprising:

[0006] A power amplifier circuit, wherein the output end of the power amplifier circuit is used to connect to the antenna to support power amplification processing of the radio frequency signal;

[0007] A power detection circuit, connected to the output end of the power amplifier circuit and the antenna, respectively, for coupling the radio frequency signal and outputting a forward coupling signal and a reverse coupling signal;

[0008] A tuning circuit, arranged in a transmission path between the power amplifier circuit and the antenna, for adjusting the load impedance of the power amplifier circuit;

[0009] A processing circuit is connected to the input end of the power amplifier circuit, the power detection circuit and the tuning circuit respectively, and the processing circuit is configured as follows:

[0010] Determine the reflection characteristic parameter of the transmission path according to the forward coupling signal and the reverse coupling signal;

[0011] Determining the real-time impedance position according to the reflection characteristic parameter and the initial impedance position of the load on the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal;

[0012] The tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment.

[0013] The above-mentioned radio frequency system, by setting the power detection circuit on the transmission path of the power amplifier circuit, enables the power detection circuit to couple the radio frequency signal and output the forward coupling signal and the reverse coupling signal to the processing circuit, and the processing circuit can determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal, and then determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load on the Smith chart, and control the tuning parameters of the tuning circuit according to the real-time impedance position and the target impedance position, so that the distance between the real-time impedance position after adjustment and the target impedance position is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, thereby optimizing the operating state of the radio frequency system, so that the radio frequency system can be adaptively adjusted in various operating scenarios, optimize its own operating state, and thus ensure the overall performance of the communication equipment.

[0014] In a second aspect, the present application provides a communication device, comprising the radio frequency system as described above.

[0015] The above-mentioned communication device includes the above-mentioned radio frequency system, and the above-mentioned radio frequency system can be adaptively adjusted in various operation scenarios to optimize its own operation state. Therefore, the communication device of this embodiment can be adaptively adjusted in various operation scenarios to optimize its own operation state, thereby ensuring the overall performance of the communication device. For example, when the target impedance position is the impedance position with the lowest power consumption, the power consumption of the entire communication device can be reduced, the endurance of the communication device can be improved, and the temperature of the communication device can be prevented from being too high.

[0016] In a third aspect, the present application further provides an impedance adjustment method, the impedance adjustment method comprising:

[0017] Determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal;

[0018] Determining the real-time impedance position according to the reflection characteristic parameter and the initial impedance position of the load on the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal;

[0019] The tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, wherein the tuning circuit is arranged on the transmitting path.

[0020] In a fourth aspect, the present application further provides a communication device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the impedance adjustment method as described above.

[0021] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the impedance adjustment method described above are implemented.

[0022] The impedance adjustment method, communication device and computer-readable storage medium can determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal, and then determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load in the Smith chart, and adjust the tuning parameters of the tuning circuit based on the position information of the real-time impedance position and the target impedance position, so that the distance between the adjusted real-time impedance position and the target impedance position is smaller than the distance between the real-time impedance position and the target impedance position before the adjustment, so that the adjusted real-time impedance position is close to the target impedance position, and the operation state of the RF system is optimized. Based on this, the RF system can be adaptively adjusted in various operation scenarios to optimize its own operation state, thereby ensuring the overall performance of the communication equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a radio frequency system according to an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a Smith chart according to an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the circuit structure of a test model according to an embodiment of the present application;

[0027] Figure 4 A simulation waveform diagram obtained based on a test model according to an embodiment of the present application;

[0028] Figure 5 A schematic structural diagram of a radio frequency system according to another embodiment of the present application;

[0029] Figure 6 Based on Figure 1 The test data table obtained from the RF system;

[0030] Figure 7 This is a structural diagram of a radio frequency system according to another embodiment of the present application;

[0031] Figure 8 This is a structural diagram of a radio frequency system according to another embodiment of the present application;

[0032] Fig. 9 This is a structural diagram of a radio frequency system according to another embodiment of the present application;

[0033] Fig.10 This is a structural diagram of a radio frequency system according to another embodiment of the present application;

[0034] Fig.11 This is a structural diagram of a radio frequency system according to another embodiment of the present application;

[0035] Fig.12 A schematic diagram of the structure of a communication device according to an embodiment of the present application;

[0036] Fig.13 A schematic diagram of a flow chart of an impedance adjustment method according to an embodiment of the present application;

[0037] Fig.14 A schematic diagram of the internal structure of a communication device according to an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 11-power amplifier circuit, 12-power detection circuit, 121-bidirectional coupler, 122-first switch circuit, 13-tuning circuit, 131-tuning sub-circuit, 1311-closed-loop tuner, 132-second switch circuit, 14-processing circuit, 141-RF transceiver, 15-temperature detection module, 20-communication equipment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first switching circuit may be referred to as a second switching circuit, and similarly, a second switching circuit may be referred to as a first switching circuit. Both the first resistor and the second resistor are switching circuits, but they are not the same switching circuit.

[0043] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0044] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0045] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0046] The radio frequency system involved in the embodiment of the present application can be applied to a communication device with a wireless communication function, and the communication device can be a handheld device, a vehicle-mounted device, a smart car, a wearable device, a computing device or other processing device connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., a mobile phone), a mobile station (MS), etc. For the convenience of description, the above-mentioned devices are collectively referred to as communication devices.

[0047] like Figure 1 As shown, the present application provides a radio frequency system, including: a power amplification circuit 11, a power detection circuit 12, a tuning circuit 13 and a processing circuit 14.

[0048] The output end of the power amplifier circuit 11 is used to connect to the antenna to support power amplification processing of the radio frequency signal. The power amplifier circuit 11 can receive the radio frequency signal and power amplify the received radio frequency signal to transmit the power-amplified radio frequency signal to the antenna for transmission through the antenna. Among them, the radio frequency signal can be a signal of a network standard such as GSM (Global System for Mobile Communications), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution) and NR (New Radio), and each network standard may include multiple frequency bands. Optionally, taking the 5GNR network standard as an example, the 5G NR signal includes a low-frequency signal, an intermediate-frequency signal, a high-frequency signal and an ultra-high-frequency signal. The frequency band division of the low-frequency signal, the intermediate-frequency signal, the high-frequency signal and the ultra-high-frequency signal can refer to the following table.

[0049]

[0050]

[0051] The power detection circuit 12 is connected to the output end of the power amplifier circuit 11 and the antenna respectively, and is used to couple the radio frequency signal and output a forward coupling signal and a reverse coupling signal. Among them, the power detection circuit 12 can be implemented by a coupler, a coupler is set in the forward feedback channel to feed back the forward coupling signal, and a coupler is set in the reverse feedback channel to feed back the reverse coupling signal; the forward feedback channel and the reverse feedback channel can also share a coupler, that is, a coupler is used to feed back the forward coupling signal and the reverse coupling signal. The forward coupling signal can be a part of the transmitted signal, and can have the same frequency and phase as the transmitted signal; the reverse coupling signal is a signal that is reflected by the antenna but not transmitted. Based on the forward coupling signal and the reverse coupling signal, the reflection characteristic parameters, such as the Voltage Standing Wave Ratio (VSWR), can be calculated.

[0052] The tuning circuit 13 is arranged on the transmission path between the power amplifier circuit 11 and the antenna, and is used to adjust the load impedance of the power amplifier circuit 11. The impedance of the tuning circuit 13 can be adjusted by adjusting the tuning parameters of the tuning circuit 13, thereby adjusting the impedance of the transmission path and improving the transmission performance of the antenna.

[0053] The processing circuit 14 is respectively connected to the input end of the power amplifier circuit 11, the power detection circuit 12 and the tuning circuit 13, and the processing circuit 14 is configured to: determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal; determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load in the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal; and adjust the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment.

[0054] in, Figure 2 For a schematic diagram of a Smith chart according to an embodiment of the present application, please refer to Figure 2 The initial impedance position of the load on the Smith chart is the impedance position of the communication device set in free space. Taking a mobile phone as an example, the initial impedance position can be the impedance position of the entire device when it is not held in the hand or in other special scenarios. The initial impedance position is related to the frequency band of the RF signal. The initial impedance position corresponding to different frequency bands of the RF signal may be different. The reflection characteristic parameters of the transmission path are determined based on the forward coupling signal and the reverse coupling signal. The reflection characteristic parameters can reflect the working performance of the transmission path. The reflection characteristic parameters and the initial impedance position are substituted into the pre-stored impedance relationship to determine the real-time impedance position. Among them, taking the reflection characteristic parameter as the voltage standing wave ratio as an example, the calculation formula of the impedance relationship can be:

[0055]

[0056]

[0057] Where VSWR is the standing wave ratio, ρ is the reflection coefficient, and Z L is the real-time impedance, and Z0 is the initial impedance.

[0058] After determining the real-time impedance position, since adjusting the tuning parameters of the tuning circuit 13 can change the impedance of the transmission path, adjusting the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position can make the distance between the adjusted real-time impedance position and the target impedance position smaller than the distance between the real-time impedance position and the target impedance position before the adjustment. It should be noted that the target impedance position can be a preset default impedance position, and the default target impedance position can be an impedance position with the lowest power consumption of the RF system.

[0059] The processing circuit 14 can be further configured to adjust the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position so that the distance between the adjusted real-time impedance position and the target impedance position is minimized. Thereby, the real-time impedance position is closest to the target impedance position, and the RF system is closest to the target state. Taking the target impedance position as an example, the impedance position with the lowest power consumption of the RF system is minimized, so that the power consumption of the RF system is maximized within the adjustable range. Among them, the minimum distance between the real-time impedance position and the target impedance position can be 0, even if the adjusted real-time impedance position is at the distance of the target impedance position.

[0060] The inventors have discovered through creative work that in the related technology, when the mobile phone antenna is touched by the human body or other metal objects during horizontal screen gaming, hand-held, USB charging, etc., the passive position of the antenna is affected, and at this time the power consumption and performance of the entire device are seriously affected.

[0061] like Figure 2 As shown, all active PA (power amplifier) ​​devices have a passive Loadpull diagram, which corresponds to the relationship curve between position and current on the Smith diagram. The position of its passive load on the Smith diagram determines its current size. When the position is closer to the lower left (third quadrant), its current is larger, and when it is closer to the upper left (first quadrant), its current is smaller. This is its inherent characteristic.

[0062] Ideally, its passive position is at the center of the Smith diagram, and VSWR = 1:1 at this time. However, due to differences in load and impedance, it is difficult to achieve the ideal state. Therefore, a set of simulations are performed below to verify the changes in power consumption under different VSWRs and phases.

[0063] Figure 3 To test the model circuit diagram, including the PA (power amplifier) ​​and the load, the simulation conditions are set to the following two:

[0064] 1- Keep Z0 = 50Ω, the VSWR (standing wave ratio) at this time is 1:1, and the power consumption is simulated at an output power of 29dbm; 2- Keep VSWR = 3:1, the output power is 29dbm, the phase is 0~360°, and the power consumption is simulated.

[0065] Figure 4 is a simulation waveform diagram obtained based on the test model. Figure 4As shown in the figure, it can be found that when VSWR = 1:1, the current remains unchanged when the phase changes from 0 to 360 degrees, and the current value is 553mA; when VSWR = 3:1, the current fluctuation value is up to 134mA when the phase changes from 0 to 360 degrees, and when VSWR = 6:1, the current fluctuation value is up to 134mA when the phase changes from 0 to 360 degrees. Figure 3 It can be seen that the current fluctuation value is larger, which shows that the larger the VSWR, the larger the current fluctuation value at different phases; Figure 3 The vertical axis represents the current, and the horizontal axis represents different phases. It can be found that the larger the VSWR, the greater the current fluctuation value at different phases.

[0066] It can be seen from this that in the relevant technical solutions, the VSWR of the whole machine will change in scenarios such as hand-held, horizontal screen, and USB plugged in, and the phase will also change, resulting in a significant impact on the current of the whole machine, and a very bad experience on the temperature rise and battery life of the whole machine.

[0067] Therefore, VSWR can reflect the impedance of the load, and the processing circuit 14 determines the real-time impedance position according to the VSWR and the initial impedance position, and then adjusts the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, so that the distance between the real-time impedance position and the target impedance position after adjustment can be made smaller than the distance between the real-time impedance position and the target impedance position before adjustment, which is beneficial to optimize the operating state of the communication equipment.

[0068] The above-mentioned radio frequency system, by setting the power detection circuit 12 on the transmission path of the power amplifier circuit 11, enables the power detection circuit 12 to couple the radio frequency signal and output the forward coupling signal and the reverse coupling signal to the processing circuit 14, and the processing circuit 14 can determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal, and then determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load on the Smith chart, and control the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, thereby optimizing the operating state of the radio frequency system, so that the radio frequency system can be adaptively adjusted in various operating scenarios, optimize its own operating state, and thus ensure the overall performance of the communication equipment.

[0069] In one embodiment, Figure 5 As shown, the radio frequency system further includes: a temperature detection module 15 .

[0070] The temperature detection module 15 is connected to the processing circuit 14 and is used to collect temperature information of the RF system. The temperature detection module 15 may include a temperature sensor, which collects temperature information of the RF system and feeds it back to the processing circuit 14. The processing circuit 14 is also configured to update the target impedance position according to the temperature information.

[0071] In the application, the radio frequency system can be set on the main board, and the temperature sensor can collect the temperature information of the main board and use the temperature information of the main board as the temperature information of the radio frequency system.

[0072] It can be understood that the temperature information of the RF system is related to the operating state of the communication equipment. When the temperature of the RF system is too high, the operating state of the communication equipment will be negatively affected and may even cause damage to some electronic components. Therefore, the target impedance position is updated according to the temperature information, so that the processing circuit 14 adjusts the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, thereby adjusting the operating state of the communication equipment to adapt to the temperature of the communication equipment and balancing the safety and communication performance of the communication equipment.

[0073] In one embodiment, the processing circuit 14 is further configured to: obtain the target temperature interval in which the temperature information is located; and update the target impedance position according to the control strategy corresponding to the target temperature interval. The target temperature interval is one of the preset temperature intervals, and the control strategies corresponding to the temperature intervals are different. The performance parameters characterized by the target impedance positions obtained based on the updates of the control strategies are different.

[0074] It should be noted that the performance parameters represented by the target impedance position may include power consumption, antenna efficiency, error vector amplitude position and one of RF power amplifier efficiency. The optimal impedance position corresponding to the power consumption, antenna efficiency, error vector amplitude position and RF power amplifier efficiency may be preset as the target impedance position corresponding to each temperature range.

[0075] In this embodiment, the processing circuit 14 compares the temperature information with each temperature interval to determine the target temperature interval in which the temperature signal is located, and then updates the target impedance position according to the control strategy corresponding to the target temperature interval to determine the target impedance position that is consistent with the temperature information, and then controls the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, thereby adjusting the operating state of the communication device to adapt to the temperature of the communication device and balancing the safety and communication performance of the communication device.

[0076] In one embodiment, the processing circuit 14 is further configured to: when the temperature information is greater than a preset first temperature threshold, update the target impedance position to one of a target power consumption position and a target equilibrium position. The target power consumption position is an impedance position with the lowest power consumption of the RF system, the target equilibrium position is an intermediate point between the target power consumption position and the target efficiency position, and the target efficiency position is an impedance position with the highest antenna efficiency.

[0077] Among them, when the temperature information is greater than the preset first temperature threshold, the temperature of the communication device is also high. Continuing to maintain the current operating state may cause further temperature rise, and then cause damage to the electronic components in the communication device. Therefore, it is necessary to adjust the operating state of the RF system to reduce the temperature of the RF system.

[0078] It can be understood that the temperature of the RF system is related to the heat generated by the operation of the RF system, and in theory, the power consumption of the RF system is positively correlated with the heat generated by the operation of the RF system, that is, the higher the power consumption of the RF system, the more heat the RF operation generates. Therefore, if the processing circuit 14 is configured to update the target impedance position to the target power consumption position when the temperature information is greater than the preset first temperature threshold, then the tuning parameters of the tuning circuit 13 are adjusted according to the real-time impedance position and the target impedance position, which can reduce the power consumption of the RF system, thereby helping to reduce the temperature of the RF system. If the processing circuit 14 is configured to update the target impedance position to the target equilibrium position when the temperature information is greater than the preset first temperature threshold, then the tuning parameters of the tuning circuit 13 are adjusted according to the real-time impedance position and the target impedance position, which can reduce the power consumption of the RF system while ensuring the efficiency of the transmitting antenna, thereby balancing the security and communication performance of the communication device.

[0079] Exemplarily, the corresponding data obtained using the radio frequency system of the present application is as follows: Figure 6 As shown, the current comparison of the three frequency bands LTE B1\B3\B41 in free space (no hand holding) and horizontal screen holding on four antennas was tested. Through comparison, it is found that the current in the horizontal screen holding case and the current in the no hand holding case are mostly better or the increment is very low, while in the related art, the current in the horizontal screen holding case and the current in the no hand holding case will differ by 100mA-200mA, so the data improvement is very large. Taking LTE B1 in the ANT3 antenna as an example, the power consumption is basically the same under different power levels such as maximum power and minimum power. Among them, for the case where the maximum power is 8mA larger, this is the data after the target impedance position is updated to the balanced position. It can be found that updating the target impedance position to the balanced position will also greatly improve the current data.

[0080] In the application, optionally, the processing circuit 14 can be further configured to: when the temperature information is greater than a preset first temperature threshold and less than a preset second temperature threshold, update the target impedance position to a target equilibrium position; when the temperature information is greater than a preset second temperature threshold, update the target impedance position to a target power consumption position. The second temperature threshold is greater than the first temperature threshold. By configuring the processing circuit 14 as described above, the RF system can be cooled down as quickly as possible when the temperature is too high; and when the temperature is relatively low, the cooling rate of the RF system and the efficiency of the transmitting antenna are balanced, so that the RF system can have better communication performance even in a state of low power consumption.

[0081] In one embodiment, the processing circuit 14 is further configured to: when the temperature information is less than a preset first temperature threshold, update the target impedance position to one of a target error vector magnitude position and a target RF power amplifier efficiency position. The target error vector magnitude position is an impedance position where the target error vector magnitude of the RF system is the lowest, and the target RF power amplifier efficiency position is an impedance position where the RF power amplifier efficiency of the RF system is the highest.

[0082] Among them, the error vector amplitude refers to the difference between the theoretical waveform and the actual waveform received, which is the RMS value of the ratio of the average error vector signal power to the average reference signal power. The size of the error vector amplitude can effectively reflect the performance of the RF system. The RF power amplifier efficiency is the efficiency of the RF power amplifier included in the RF system, which is obviously also directly related to the performance of the RF system.

[0083] It can be understood that when the temperature information is less than the preset first temperature threshold, the temperature of the RF system is low at this time, and more attention can be paid to the working performance of the RF system. Therefore, the target impedance position can be updated to one of the target error vector amplitude position and the target RF power amplifier efficiency position, so that the processing circuit 14 adjusts the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, and thus the working performance of the RF system can be optimized.

[0084] In one embodiment, Figure 7 As shown, the power detection circuit 12 includes: a bidirectional coupler 121 and a first switch circuit 122. The first switch circuit 122 may include at least one first switch device, and the first switch device may be a single-pole double-throw switch.

[0085] Among them, the bidirectional coupler 121 is located between the power amplifier circuit 11 and the tuning circuit 13, the two coupling output ends of the bidirectional coupler 121 are respectively connected to the two first ends of the first switch circuit 122, the second end of the first switch circuit 122 is connected to the processing circuit 14, and the bidirectional coupler 121 is used to receive the radio frequency signal and couple the radio frequency signal to output a forward coupling signal and a reverse coupling signal.

[0086] It can be understood that the bidirectional coupler 121 is located between the power amplifier circuit 11 and the tuning circuit 13, and the bidirectional coupler 121 can receive the radio frequency signal amplified by the power amplifier circuit 11 and couple and output the forward coupling signal and the reverse coupling signal, and the two coupling output ends of the bidirectional coupler 121 respectively output the forward coupling signal and the reverse coupling signal. Since the two coupling output ends of the bidirectional coupler 121 are respectively connected to the two first ends of the first switch circuit 122, and the second end of the first switch circuit 122 is connected to the processing circuit 14, the forward coupling signal and the reverse coupling signal output by the bidirectional coupler 121 can be output to the processing circuit 14 through the first switch circuit 122. After receiving the forward coupling signal and the reverse coupling signal, the processing circuit 14 can determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal, and then determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load in the Smith chart; adjust the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, so as to optimize the working performance of the radio frequency system.

[0087] In one embodiment, Figure 8 As shown, the tuning circuit 13 includes a second switch circuit 132 and a plurality of tuning sub-circuits 131. The second switch circuit 132 may include at least one second switch device, which may be a multi-pole multi-throw switch.

[0088] Among them, the first end of the second switch circuit 132 is connected to the power detection circuit 12, and the multiple second ends of the second switch circuit 132 are correspondingly connected to the multiple tuning sub-circuits 131, and each tuning sub-circuit 131 is connected to the antenna one by one. The second switch circuit 132 is configured to switch on the connection between the target tuning sub-circuit 131 and the power detection circuit 12, and the target tuning sub-circuit 131 and the target antenna connected to the target tuning sub-circuit 131 are used to support the transmission of radio frequency signals.

[0089] In application, the processing circuit 14 can be connected to the control end of the second switch circuit 132 , so that the processing circuit 14 can control the switch state of the second switch circuit 132 , thereby controlling the connection between the switching-on target tuning subcircuit 131 and the power detection circuit 12 .

[0090] The first end of the second switch circuit 132 is connected to the power detection circuit 12, and the multiple second ends of the second switch circuit 132 are correspondingly connected to the multiple tuning sub-circuits 131. Therefore, by controlling the switch state of the second switch circuit 132, the connection between the target tuning sub-circuit 131 and the power detection circuit 12 can be switched on, so that the RF signal can be transmitted to the target tuning sub-circuit 131 through the second switch circuit 132, and then transmitted to the target antenna through the target tuning sub-circuit 131, and transmitted through the target antenna. At this time, the target tuning sub-circuit 131 and the target antenna connected to the target tuning sub-circuit 131 are located in the transmission path, and the impedance of the target tuning sub-circuit 131 can be changed by adjusting the tuning parameters of the target tuning sub-circuit 131, thereby adjusting the impedance of the transmission path. Therefore, by adjusting the tuning parameters of the target tuning subcircuit 131 according to the real-time impedance position and the target impedance position, the real-time impedance position can be brought closer to the target impedance position, and the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, thereby achieving adaptive adjustment of the RF system and optimizing the operating state of the RF system.

[0091] It should be noted that the second switch circuit 132 can also be used to conduct the receiving path to transmit the radio frequency signal received by the antenna to the power amplifier, and then the power amplifier amplifies the radio frequency signal and transmits it to the processing circuit 14.

[0092] In one embodiment, Fig. 9 As shown, the tuning subcircuit 131 includes a closed-loop tuner 1311 . The closed-loop tuner 1311 has multiple tuning states, and the impedance of the closed-loop tuner 1311 is different in each tuning state.

[0093] Among them, the closed-loop tuner 1311 can be internally composed of many switches and capacitors and inductors connected to the external RF port to form different combinations, that is, different tuning states. The impedance of the closed-loop tuner 1311 in each tuning state is different. Therefore, by adjusting the tuning state of the closed-loop tuner 1311 according to the real-time impedance position and the target impedance position, the impedance adjustment of the transmission path can be achieved, and then the impedance position of the load can be adjusted, thereby optimizing the operating state of the RF system.

[0094] In one embodiment, Fig.10As shown, the processing circuit 14 includes a radio frequency transceiver 141, and the radio frequency transceiver 141 is configured with a transmitting port and a feedback port. The radio frequency transceiver 141 outputs a radio frequency signal through the transmitting port. The radio frequency transceiver 141 can also be configured with a control port, which is connected to the control end of the first switch circuit 122 and the control end of the second switch circuit 132 through the control port, so as to send control signals to the first switch circuit 122 and the second switch circuit 132 respectively, and control the switch states of the first switch circuit 122 and the second switch circuit 132 respectively. For example, the radio frequency transceiver 141 can be configured with one of a mipi (Mobile Industry Processor Interface, mobile industry processor port) port and a GPIO (General Purpose Input Output, general input / output) port, and the control circuit can be connected to the first switch circuit 122 and the second switch circuit 132 respectively through the mipi port or the GPIO port, so as to send the first control signal and the second control signal to the first switch circuit 122 and the second switch circuit 132 respectively to control the conduction state, thereby improving the control efficiency.

[0095] The power amplifier circuit 11 may include a power amplifier. The power amplifier is connected to the transmitting port, and the power amplifier can receive the radio frequency signal output by the radio frequency transceiver 141. The power amplifier is used to perform power amplification processing on the radio frequency signal output by the transmitting port.

[0096] The power detection circuit 12 is connected to the power amplifier and the feedback port respectively, and is used to couple the RF signal after power amplification processing, output the forward coupling signal and the reverse coupling signal to the feedback port, and then enable the RF transceiver 141 to receive the forward coupling signal and the reverse coupling signal through the feedback port.

[0097] Among them, the RF transceiver 141 can determine the reflection characteristic parameters according to the forward coupling signal and the reverse coupling signal, determine the real-time impedance position according to the reflection characteristic parameters and the initial impedance position, and adjust the tuning parameters of the tuning circuit 13 according to the real-time impedance position and the target impedance position, so that the distance between the real-time impedance position and the target impedance position after adjustment can be made smaller than the distance between the real-time impedance position and the target impedance position before adjustment, which is beneficial to optimize the operating state of the communication equipment.

[0098] Based on the above embodiments, the radio frequency system can be as follows Fig.11As shown, the RF system includes an RF transceiver 141, a power amplifier circuit 11, a bidirectional coupler 121, a first switch circuit 122, a second switch circuit 132 and a plurality of closed-loop tuners 1311. The RF transceiver 141 is configured with a transmitting port and a feedback port. The RF signal outputted from the transmitting port is amplified by the power amplifier circuit 11 and then transmitted to the bidirectional coupler 121. The bidirectional coupler 121 couples the RF signal and outputs a forward coupling signal and a reverse coupling signal to the feedback port via the first switch circuit 122. The RF transceiver 141 controls the second switch circuit 132 to switch on, and determines the reflection characteristic parameters of the transmitting path according to the forward coupling signal and the reverse coupling signal; determines the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load on the Smith chart, and adjusts the tuning state of the switched closed-loop regulator according to the real-time impedance position and the target impedance position, so that the distance between the adjusted real-time impedance position and the target impedance position is smaller than the distance between the real-time impedance position and the target impedance position before the adjustment. This will optimize the operating status of the RF system, allowing the RF system to perform adaptive adjustments in various operating scenarios and optimize its own operating status, thereby ensuring the overall performance of the communication equipment.

[0099] Based on the same inventive concept, Fig.12 As shown, the present application provides a communication device 20, including the radio frequency system as described in any of the above embodiments.

[0100] The communication device 20 may be a handheld device, a vehicle-mounted device, a smart car, a wearable device, a computing device or other processing device connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., a mobile phone), a mobile station (MS), etc.

[0101] The communication device 20 of this embodiment includes the radio frequency system described in any of the above embodiments, and the radio frequency system of the above embodiments can be adaptively adjusted in various operating scenarios to optimize its own operating state. Therefore, the communication device of this embodiment can be adaptively adjusted in various operating scenarios to optimize its own operating state, thereby ensuring the overall performance of the communication device. For example, when the target impedance position is the impedance position with the lowest power consumption, the power consumption of the entire communication device can be reduced, the endurance of the communication device can be improved, and the temperature of the communication device can be prevented from being too high.

[0102] The present application also provides an impedance adjustment method, which can be applied to communication equipment. The following description is based on the fact that the impedance adjustment method can be applied to communication equipment. Fig.13 As shown, the impedance adjustment method includes:

[0103] S1301: Determine reflection characteristic parameters of a transmission path according to a forward coupling signal and a reverse coupling signal.

[0104] The forward coupled signal may be a part of the transmitted signal and may have the same frequency and phase as the transmitted signal; the reverse coupled signal is a signal that is reflected by the antenna but not transmitted. Based on the forward coupled signal and the reverse coupled signal, reflection characteristic parameters such as the voltage standing wave ratio (VSWR) can be calculated.

[0105] In the application, the forward coupling signal and the reverse coupling signal can be collected by a coupler. A coupler is set in the forward feedback channel to feed back the forward coupling signal, and a coupler is set in the reverse feedback channel to feed back the reverse coupling signal. The forward feedback channel and the reverse feedback channel can also share a coupler, that is, a coupler is used to feed back the forward coupling signal and the reverse coupling signal.

[0106] S1302: Determine the real-time impedance position according to the reflection characteristic parameter and the initial impedance position of the load on the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal.

[0107] Among them, the initial impedance position of the load in the Smith chart is the impedance position of the communication device set in free space. Taking a mobile phone as an example, the initial impedance position can be the impedance position of the entire device when it is not held in the hand or in other special scenarios. The initial impedance position is related to the frequency band of the RF signal. The initial impedance position corresponding to different frequency bands of the RF signal may be different.

[0108] Specifically, the reflection characteristic parameter can reflect the working performance of the transmission path, and the real-time impedance position can be determined by substituting the reflection characteristic parameter and the initial impedance position into the pre-stored impedance relationship, and the impedance relationship can be obtained through multiple tests.

[0109] S1303: adjusting tuning parameters of a tuning circuit according to the real-time impedance position and the target impedance position so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, wherein the tuning circuit is arranged on a transmitting path.

[0110] Among them, adjusting the tuning parameters of the tuning circuit can change the impedance of the transmission path. Therefore, adjusting the tuning parameters of the tuning circuit according to the real-time impedance position and the target impedance position can make the distance between the real-time impedance position and the target impedance position after adjustment smaller than the distance between the real-time impedance position and the target impedance position before adjustment. It should be noted that the target impedance position can be a preset default impedance position, and the default target impedance position can be an impedance position with the lowest power consumption of the RF system.

[0111] The impedance adjustment method described above determines the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal, and then determines the real-time impedance position according to the reflection characteristic parameters and the initial impedance position of the load in the Smith chart, and adjusts the tuning parameters of the tuning circuit based on the position information of the real-time impedance position and the target impedance position, so that the distance between the adjusted real-time impedance position and the target impedance position is smaller than the distance between the real-time impedance position and the target impedance position before the adjustment, so that the adjusted real-time impedance position is close to the target impedance position, and the operation state of the RF system is optimized. Based on this, the RF system can be adaptively adjusted in various operation scenarios to optimize its own operation state, thereby ensuring the overall performance of the communication equipment.

[0112] In one embodiment, the impedance adjustment method may further include: adjusting the tuning parameters of the tuning circuit according to the real-time impedance position and the target impedance position so as to minimize the distance between the adjusted real-time impedance position and the target impedance position.

[0113] In this embodiment, the tuning parameters of the tuning circuit are adjusted to minimize the distance between the adjusted real-time impedance position and the target impedance position, so that the real-time impedance position is closest to the target impedance position, and the RF system is closest to the target state. For example, the target impedance position can be the impedance position with the lowest power consumption of the RF system, and the distance between the real-time impedance position and the target impedance position is minimized, so that the power consumption of the RF system is reduced to the maximum within the adjustable range.

[0114] In one embodiment, the impedance adjustment method further includes: obtaining temperature information of the radio frequency system; and updating the target impedance position according to the temperature information.

[0115] In the application, the radio frequency system can be set on the mainboard, and the temperature information of the mainboard can be collected, and the temperature information of the mainboard is used as the temperature information of the radio frequency system. Specifically, the temperature information of the mainboard can be collected by a temperature sensor set in the communication device.

[0116] It can be understood that the temperature information of the RF system is related to the operating state of the communication equipment. When the temperature of the RF system is too high, the operating state of the communication equipment will be negatively affected and may even cause damage to some electronic components. Therefore, the target impedance position is updated according to the temperature information, so that the processing circuit adjusts the tuning parameters of the tuning circuit according to the real-time impedance position and the target impedance position, thereby adjusting the operating state of the communication equipment to adapt to the temperature of the communication equipment and balancing the safety and communication performance of the communication equipment.

[0117] In one embodiment, updating the target impedance position according to the temperature information includes: obtaining the target temperature interval in which the temperature information is located, and updating the target impedance position according to the control strategy corresponding to the target temperature interval. The target temperature interval is one of the preset temperature intervals, and the control strategies corresponding to the temperature intervals are different. The performance parameters characterized by the target impedance positions obtained based on the updates of the control strategies are different.

[0118] It should be noted that the performance parameters represented by the target impedance position may include power consumption, antenna efficiency, error vector amplitude position and one of RF power amplifier efficiency. The optimal impedance position corresponding to the power consumption, antenna efficiency, error vector amplitude position and RF power amplifier efficiency may be preset as the target impedance position corresponding to each temperature range.

[0119] In this embodiment, the target temperature range in which the temperature signal is located is determined by comparing the temperature information with each temperature range, and then the target impedance position is updated according to the control strategy corresponding to the target temperature range to determine the target impedance position that is compatible with the temperature information, and then the tuning parameters of the tuning circuit are controlled according to the real-time impedance position and the target impedance position, so as to adjust the operating state of the communication equipment to adapt to the temperature of the communication equipment and balance the safety and communication performance of the communication equipment.

[0120] In one embodiment, the target impedance position is updated according to the control strategy corresponding to the target temperature range, including: when the temperature information is greater than a preset first temperature threshold, the target impedance position is updated to one of a target power consumption position and a target equilibrium position. The target power consumption position is the impedance position with the lowest power consumption of the RF system, the target equilibrium position is the middle point position between the target power consumption position and the target efficiency position, and the target efficiency is the impedance position with the highest antenna efficiency.

[0121] Among them, when the temperature information is greater than the preset first temperature threshold, the temperature of the communication device is also high. Continuing to maintain the current operating state may cause further temperature rise, and then cause damage to the electronic components in the communication device. Therefore, it is necessary to adjust the operating state of the RF system to reduce the temperature of the RF system.

[0122] In this embodiment, it can be understood that the temperature of the RF system is related to the heat generated by the operation of the RF system, and in theory, the power consumption of the RF system is positively correlated with the heat generated by the operation of the RF system, that is, the higher the power consumption of the RF system, the more heat the RF operation generates. Therefore, if the temperature information is greater than the preset first temperature threshold, the target impedance position is updated to the target power consumption position, and the tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position, which can reduce the power consumption of the RF system, thereby helping to reduce the temperature of the RF system. If the temperature information is greater than the preset first temperature threshold, the target impedance position is updated to the target equilibrium position, and the tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position, which can reduce the power consumption of the RF system while ensuring the efficiency of the transmitting antenna, thereby balancing the security and communication performance of the communication equipment.

[0123] In one embodiment, the target impedance position is updated according to the control strategy corresponding to the target temperature range, including: when the temperature information is less than a preset first temperature threshold, the target impedance position is updated to one of a target error vector magnitude position and a target RF power amplifier efficiency position. The target error vector magnitude position is an impedance position where the target error vector magnitude of the RF system is the lowest, and the target RF power amplifier efficiency position is an impedance position where the RF power amplifier efficiency of the RF system is the highest.

[0124] Among them, the error vector amplitude refers to the difference between the theoretical waveform and the actual waveform received, which is the RMS value of the ratio of the average error vector signal power to the average reference signal power. The size of the error vector amplitude can effectively reflect the performance of the RF system. The RF power amplifier efficiency is the efficiency of the RF power amplifier included in the RF system, which is obviously also directly related to the performance of the RF system.

[0125] In the present embodiment, it can be understood that when the temperature information is less than the preset first temperature threshold, the temperature of the RF system is relatively low at this time, and more emphasis can be placed on the working performance of the RF system. Therefore, the target impedance position can be updated to one of the target error vector amplitude position and the target RF power amplifier efficiency position, so that after adjusting the tuning parameters of the tuning circuit according to the real-time impedance position and the target impedance position, the working performance of the RF system can be optimized, thereby optimizing the overall performance of the communication device.

[0126] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0127] In one embodiment, a communication device is provided. The communication device includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the impedance adjustment method described in any of the above embodiments.

[0128] The communication device may be a terminal, and its internal structure diagram may be as follows: Fig.14 As shown. The communication device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. Among them, the processor of the communication device is used to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the communication device is used to exchange information between the processor and an external device. The communication interface of the communication device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, an impedance adjustment method is implemented. The display unit of the communication device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the communication device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the communication device housing, or an external keyboard, touchpad or mouse.

[0129] Those skilled in the art will understand that Fig.14The structure shown in the figure is only a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the communication device to which the scheme of the present application is applied. The specific communication device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0130] The embodiment of the present application further provides a computer-readable storage medium, one or more non-volatile computer-readable storage media containing computer-executable instructions, which, when executed by one or more processors, enable the processors to perform the steps of the impedance adjustment method described in any of the above embodiments.

[0131] 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, stored data, displayed data, 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 relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0132] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0133] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0134] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0135] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A radio frequency system, characterized in that: include: A power amplifier circuit, wherein the output end of the power amplifier circuit is used to connect to the antenna, and the power amplifier circuit is used to support power amplification processing of the radio frequency signal; A power detection circuit, connected to the output end of the power amplifier circuit and the antenna, respectively, for coupling the radio frequency signal and outputting a forward coupling signal and a reverse coupling signal; A tuning circuit, arranged on a transmission path between the power amplifier circuit and the antenna, for adjusting the load impedance of the power amplifier circuit; A processing circuit is connected to the input end of the power amplifier circuit, the power detection circuit and the tuning circuit respectively, and the processing circuit is configured as follows: Determine the reflection characteristic parameter of the transmission path according to the forward coupling signal and the reverse coupling signal; Determining the real-time impedance position according to the reflection characteristic parameter and the initial impedance position of the load on the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal; The tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment.

2. The radio frequency system according to claim 1, characterized in that: The radio frequency system also includes: A temperature detection module is connected to the processing circuit and is used to collect temperature information of the radio frequency system; wherein the processing circuit is further configured as follows: The target impedance position is updated according to the temperature information.

3. The radio frequency system according to claim 2, characterized in that: The processing circuit is further configured to: Acquire a target temperature interval in which the temperature information is located, wherein the target temperature interval is one of the preset temperature intervals; The target impedance position is updated according to the control strategy corresponding to the target temperature interval, wherein the control strategies corresponding to the temperature intervals are different, and the performance parameters characterized by the target impedance positions obtained based on the updates of the control strategies are different.

4. The radio frequency system according to claim 3, characterized in that: The processing circuit is further configured to: When the temperature information is greater than a preset first temperature threshold, the target impedance position is updated to one of a target power consumption position and a target equilibrium position, wherein the target power consumption position is the impedance position where the RF system has the lowest power consumption, the target equilibrium position is the midpoint between the target power consumption position and the target efficiency position, and the target efficiency position is the impedance position where the antenna has the highest efficiency.

5. The radio frequency system according to claim 3, characterized in that: The processing circuit is further configured to: When the temperature information is less than a preset first temperature threshold, the target impedance position is updated to one of a target error vector amplitude position and a target RF power amplifier efficiency position, wherein the target error vector amplitude position is the impedance position where the target error vector amplitude of the RF system is the lowest, and the target RF power amplifier efficiency position is the impedance position where the RF power amplifier efficiency of the RF system is the highest.

6. The radio frequency system according to claim 1, characterized in that: The power detection circuit includes: a bidirectional coupler and a first switch circuit, the bidirectional coupler is located between the power amplifier circuit and the tuning circuit, the two coupling output ends of the bidirectional coupler are respectively connected to the two first ends of the first switch circuit, the second end of the first switch circuit is connected to the processing circuit, and the bidirectional coupler is used to receive the radio frequency signal and couple the radio frequency signal to output the forward coupling signal and the reverse coupling signal.

7. The radio frequency system according to claim 1, characterized in that: The tuning circuit includes a second switching circuit and multiple tuning sub-circuits, the first end of the second switching circuit is connected to the power detection circuit, the multiple second ends of the second switching circuit are correspondingly connected to the multiple tuning sub-circuits, each of the tuning sub-circuits is connected to the antenna one-to-one, and the second switching circuit is configured to switch on the connection between the target tuning sub-circuit and the power detection circuit, and the target tuning sub-circuit and the target antenna connected to the target tuning sub-circuit are used to support the transmission of the radio frequency signal.

8. The radio frequency system according to claim 7, characterized in that: The tuning subcircuit includes a closed-loop tuner, wherein the closed-loop tuner has multiple tuning states, and the impedance of the closed-loop tuner in each tuning state is different.

9. The radio frequency system according to claim 1, characterized in that: The processing circuit includes a radio frequency transceiver configured with a transmit port and a feedback port; The power amplification circuit includes a power amplifier, which is connected to the transmitting port and is used to perform power amplification processing on the radio frequency signal output by the transmitting port; The power detection circuit is connected to the power amplifier and the feedback port respectively, and is used to couple the radio frequency signal after power amplification processing, and output the forward coupling signal and the reverse coupling signal to the feedback port.

10. The radio frequency system according to claim 1, characterized in that: The processing circuit is further configured to: The tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position so that the adjusted real-time impedance position is at a distance from the target impedance position.

11. A communication device, characterized in that: Comprising a radio frequency system as claimed in any one of claims 1 to 10.

12. An impedance adjustment method, characterized in that: The impedance adjustment method comprises: Determine the reflection characteristic parameters of the transmission path according to the forward coupling signal and the reverse coupling signal; Determining the real-time impedance position according to the reflection characteristic parameter and the initial impedance position of the load on the Smith chart; wherein the initial impedance position is related to the frequency band of the radio frequency signal; The tuning parameters of the tuning circuit are adjusted according to the real-time impedance position and the target impedance position so that the distance between the real-time impedance position and the target impedance position after adjustment is smaller than the distance between the real-time impedance position and the target impedance position before adjustment, wherein the tuning circuit is arranged on the transmitting path.

13. The impedance adjustment method according to claim 12, characterized in that: The impedance adjustment method further comprises: Get the temperature information of the RF system; The target impedance position is updated according to the temperature information.

14. The impedance adjustment method according to claim 13, characterized in that: The updating of the target impedance position according to the temperature information includes: Acquire a target temperature interval in which the temperature information is located, wherein the target temperature interval is one of the preset temperature intervals; The target impedance position is updated according to the control strategy corresponding to the target temperature interval, wherein the control strategies corresponding to the temperature intervals are different, and the performance parameters characterized by the target impedance positions obtained based on the updates of the control strategies are different.

15. The impedance adjustment method according to claim 14, characterized in that: The updating of the target impedance position according to the control strategy corresponding to the target temperature range includes: When the temperature information is greater than a preset first temperature threshold, the target impedance position is updated to one of a target power consumption position and a target equilibrium position, wherein the target power consumption position is the impedance position where the RF system has the lowest power consumption, the target equilibrium position is the midpoint between the target power consumption position and the target efficiency position, and the target efficiency is the impedance position where the antenna has the highest efficiency.

16. The impedance adjustment method according to claim 14, characterized in that: The updating of the target impedance position according to the control strategy corresponding to the target temperature range includes: When the temperature information is less than a preset first temperature threshold, the target impedance position is updated to one of a target error vector amplitude position and a target RF power amplifier efficiency position, wherein the target error vector amplitude position is the impedance position where the target error vector amplitude of the RF system is the lowest, and the target RF power amplifier efficiency position is the impedance position where the RF power amplifier efficiency of the RF system is the highest.

17. A communication device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the computer program is executed by the processor, the processor is caused to perform the steps of the impedance adjustment method according to any one of claims 12 to 16.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the impedance adjustment method according to any one of claims 12 to 16 are implemented.

Images