Radio frequency system, terminal and radio frequency signal regulation and control method

Abstract

The invention provides a radio frequency system, a terminal and a radio frequency signal regulation and control method. The radio frequency system comprises an antenna radiator, a transceiver, a transmitting circuit, a predistorter, a first feedback receiving line and a second feedback receiving line. The transmitting circuit comprises a power amplifier, a first transmission line, a filter and a second transmission line, the first transmission line is electrically connected between the power amplifier and the filter, and the second transmission line is electrically connected between the filter and the antenna radiator. The predistorter is electrically connected in front of the input end of the power amplifier and used for compensating the nonlinear characteristic of the power amplifier. One end of the first feedback receiving line is coupled with the first transmission line, and the other end is electrically connected with the predistorter. One end of the second feedback receiving line is coupled with the second transmission line, and the other end is electrically connected with the transceiver. According to the radio frequency system, the terminal and the radio frequency signal regulation and control method provided by the invention, the efficiency and the linearity of the power amplifier can be more accurately balanced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a radio frequency system, a terminal, and a method for controlling radio frequency signals. Background Art

[0002] In RF systems, power amplifiers (PAs) are nonlinear devices, presenting a conflict between efficiency and linearity. Filters, due to their inherent passband non-flatness, can easily cause amplitude distortion in the feedback signal. Furthermore, the filter filters out the out-of-band distortion components of the PA output, resulting in the loss of some nonlinear information in the feedback signal. Therefore, how to more accurately balance the efficiency and linearity of the PA in RF systems has become a technical issue that needs to be addressed. Summary of the Invention

[0003] The present application provides a radio frequency system, a terminal, and a radio frequency signal control method that can more accurately balance the efficiency and linearity of a PA.

[0004] In one aspect, the present application provides a radio frequency system, comprising:

[0005] Antenna radiator;

[0006] transceiver;

[0007] A transmitting circuit, comprising a power amplifier, a first transmission line, a filter, and a second transmission line, wherein the input end of the power amplifier is electrically connected to the transceiver, the first transmission line is electrically connected between the output end of the power amplifier and the input end of the filter, and the second transmission line is electrically connected between the output end of the filter and the input end of the antenna radiator;

[0008] a predistorter, the predistorter being electrically connected before the input terminal of the power amplifier, the predistorter being used to compensate for the nonlinear characteristics of the power amplifier;

[0009] a first feedback receiving circuit, one end of the first feedback receiving circuit being coupled to the first transmission circuit, and the other end of the first feedback receiving circuit being electrically connected to the predistorter; and

[0010] A second feedback receiving line, one end of the second feedback receiving line is coupled to the second transmission line, and the other end of the second feedback receiving line is electrically connected to the transceiver.

[0011] On the other hand, the present application also provides a terminal, including a device body and the radio frequency system, wherein the radio frequency system is arranged on the device body.

[0012] On the other hand, the present application further provides a method for controlling a radio frequency signal, which is executed in the radio frequency system, comprising:

[0013] Acquire a first signal fed back by the first feedback receiving circuit;

[0014] performing predistortion processing on the transmitted radio frequency signal according to the first signal;

[0015] Acquire a second signal fed back by the second feedback receiving circuit;

[0016] The power of the transmitted radio frequency signal is adjusted according to the second signal.

[0017] The radio frequency system provided by the present application includes an antenna radiator, a transceiver, a transmitting circuit, a predistorter, a first feedback receiving line and a second feedback receiving line. The transmitting circuit includes a transceiver, a power amplifier, a first transmission line, a filter and a second transmission line. The transceiver is electrically connected to the input end of the power amplifier, the first transmission line is electrically connected between the output end of the power amplifier and the input end of the filter, the second transmission line is electrically connected between the output end of the filter and the input end of the antenna radiator, the predistorter is electrically connected before the input end of the power amplifier, and is used to compensate for the nonlinear characteristics of the power amplifier. One end of the first feedback receiving line is coupled to the first transmission line, and the other end of the first feedback receiving line is electrically connected to the predistorter. The second feedback receiving line is electrically connected to the predistorter. One end of the feedback receiving line is coupled to the second transmission line, and the other end of the second feedback receiving line is electrically connected to the transceiver. In this way, the first feedback receiving line is coupled to the back end of the power amplifier and the front end of the filter, so that the signal fed back by the first feedback receiving line is not filtered. This can prevent the predistorter from misjudging the nonlinearity of the power amplifier and causing overcompensation or undercompensation of the nonlinearity of the power amplifier. In other words, the linearity of the power amplifier can be compensated more accurately. The second feedback receiving line is coupled to the back end of the filter and the front end of the antenna radiator, so that the signal fed back by the second feedback receiving line is closer to the signal at the input end of the antenna radiator, which is conducive to ensuring the accuracy of power control and thus achieving a precise balance between the efficiency and linearity of the power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments.

[0019] Figure 1 A schematic structural diagram of a radio frequency system provided in an embodiment of the present application;

[0020] Figure 2 Another structural diagram of a radio frequency system provided in an embodiment of the present application;

[0021] Figure 3 A linearity curve diagram of a predistorter and a power amplifier in a radio frequency system provided in an embodiment of the present application;

[0022] Figure 4 for Figure 1 The radio frequency system shown includes a structural schematic diagram of a first coupler and a second coupler;

[0023] Figure 5 for Figure 2 The radio frequency system shown includes a structural schematic diagram of a first coupler and a second coupler;

[0024] Figure 6 for Figure 1 Another structural schematic diagram of the radio frequency system shown includes a first coupler and a second coupler;

[0025] Figure 7 for Figure 2 Another structural schematic diagram of the radio frequency system shown includes a first coupler and a second coupler;

[0026] Figure 8 for Figure 5 The radio frequency system shown also includes a schematic diagram of the structure of the controller;

[0027] Figure 9 A schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0028] Figure 10 A schematic diagram of a flow chart of a method for controlling radio frequency signals provided in an embodiment of the present application;

[0029] Figure 11 for Figure 10 The method for controlling radio frequency signals shown includes a flow chart of steps S101 and S301.

[0030] Description of reference numerals:

[0031] RF system 100; antenna radiator 10; transceiver 20; predistorter 30; first feedback receiving line 401; second feedback receiving line 501; power amplifier 202; first transmission line 203; filter 204; second transmission line 205; first coupler 402; second coupler 502; first electrical connection port A; second electrical connection port B; third electrical connection port C; fourth electrical connection port D; fifth electrical connection port E; sixth electrical connection port F; seventh electrical connection port G; eighth electrical connection port H; feedback port M; switching switch 60; controller 70; transmitting port N; terminal 1000; device body 11. DETAILED DESCRIPTION

[0032] The technical solutions provided by this application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in this application are only some of the embodiments, not all of the embodiments. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] References to "embodiments" and "examples" in this application mean that the particular features, structures, or characteristics being described may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute mutually exclusive, independent, or alternative embodiments to other embodiments.

[0034] The terms "first," "second," and so on, in the specification and claims of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a component or device comprising one or more parts is not limited to the one or more parts listed, but may optionally include one or more parts that are not listed but are inherent to the illustrated product, or one or more parts that it should have based on the described functionality.

[0035] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic structural diagram of a radio frequency system 100 provided in an embodiment of the present application is shown in FIG. Figure 2 This is another schematic diagram of the structure of a radio frequency system 100 provided in an embodiment of the present application. The radio frequency system 100 includes an antenna radiator 10, a transceiver 20, a transmitting circuit, a predistorter 30, a first feedback receiving circuit 401, and a second feedback receiving circuit 501. The transmitting circuit includes a power amplifier 202, a first transmission line 203, a filter 204, and a second transmission line 205.

[0036] The antenna radiator 10 is a conductor with specific dimensions. When divided by the structure of the antenna radiator 10, the antenna radiator 10 includes but is not limited to a monopole antenna radiator, a dipole antenna radiator, a patch antenna radiator, an array antenna radiator, a spiral antenna radiator, etc. When divided by the application scenario of the antenna radiator 10, the antenna radiator 10 includes but is not limited to a cellular antenna radiator, a WIFI antenna radiator, or a satellite antenna radiator. The cellular antenna radiator is used to support cellular communications, including but not limited to 4G mobile communications, or 5G mobile communications, etc.; the WIFI antenna radiator is used to support WIFI communications; the satellite antenna radiator is used to support satellite communications, including but not limited to Global Positioning System (GPS) communications. When divided by the working frequency band of the antenna radiator 10, the antenna radiator 10 includes but is not limited to a low-frequency antenna radiator, a medium-high frequency antenna radiator, or an ultra-high frequency antenna radiator. Among them, low frequency includes frequency bands less than or equal to 1 GHz, medium and high frequency includes frequency bands greater than 1 GHz and less than 3 GHz, and ultra-high frequency includes frequency bands greater than or equal to 3 GHz.

[0037] This application does not specifically limit the number of antenna radiators 10. In one possible embodiment, the number of antenna radiators 10 may be one. In another possible embodiment, the number of antenna radiators 10 may be multiple, including but not limited to two, three, four, five, etc.

[0038] The transceiver 20 includes a transmitter and a receiver. The transmitter transmits radio frequency signals. The power amplifier 202 amplifies the radio frequency signals transmitted by the transmitter. The filter 204 filters out interference and spurious signals from the signal amplified by the power amplifier 202. The transmitter, power amplifier 202, first transmission line 203, filter 204, and second transmission line 205 form a transmission path. Of course, the radio frequency system 100 may also include a reception path. A receiver, a low-noise amplifier, and the like may form the reception path.

[0039] The power amplifier (PA) 202 is the most energy-intensive component in the RF system 100. Its efficiency, power, and gain, among other metrics, play a key role in determining the device's transmission performance and cost. As a typical nonlinear device, the PA 202 faces a conflict between efficiency and linearity. While efficiency increases with power, linearity decreases. When operating in its high-efficiency range, the PA 202 exhibits amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) distortion due to its inherent nonlinearity and memory effects. This increases the bit error rate (BER) of the demodulated signal during communication, causes out-of-band spectrum leakage, interferes with adjacent channel communications, and presents difficulties for receiver demodulation. On the other hand, ensuring the linearity of the PA 202 requires high power back-off, which reduces the PA's 202 efficiency and output power, leading to cost and heat dissipation issues.

[0040] Filter 204, due to its inherent passband non-flatness (e.g., ripple), can cause signal amplitude distortion, leading to misjudgment of the nonlinear characteristics of power amplifier 202 and resulting in over- or under-compensation. After the RF signal output from transceiver 20 is amplified by power amplifier 202, power amplifier 202 itself amplifies all input signals, thus also amplifying components of the nonlinear input signal. The nonlinear signal output by power amplifier 202 is a superposition of the amplified nonlinearity of power amplifier 202 itself and the input nonlinear signal. Filter 204 filters out out-of-band distortion components (e.g., harmonics and intermodulation products) output by power amplifier 202, resulting in the loss of some nonlinear information from power amplifier 202 in the signal after filter 204. This problem is more pronounced in the sidebands of filter 204.

[0041] To solve the problems caused by the power amplifier 202 and the filter 204 , the present application provides a radio frequency system 100 that can more accurately balance the efficiency and linearity of the power amplifier 202 in the radio frequency system 100 .

[0042] The transceiver 20 is electrically connected to the input of the power amplifier 202. The transceiver 20 and the input of the power amplifier 202 may be electrically connected directly or indirectly. In one possible implementation, the transceiver 20 and the input of the power amplifier 202 are electrically connected via a third transmission line. It will be appreciated that the radio frequency signal transmitted by the transceiver 20 is transmitted to the power amplifier 202 via the third transmission line.

[0043] The first transmission line 203 is electrically connected between the output of the power amplifier 202 and the input of the filter 204. As can be understood, the power amplifier 202 receives the RF signal transmitted by the transceiver 20, amplifies the power of the signal, and then transmits it to the filter 204 via the first transmission line 203.

[0044] The second transmission line 205 is electrically connected between the output end of the filter 204 and the input end of the antenna radiator 10. As can be understood, the filter 204 receives the RF signal amplified by the power amplifier 202, filters out interference and spurious signals, and then transmits the signal to the antenna radiator 10 via the second transmission line 205.

[0045] The predistorter 30 is electrically connected before the input of the power amplifier 202. In one embodiment, the predistorter 30 may be electrically connected between the transceiver 20 and the input of the power amplifier 202. In another embodiment, the predistorter 30 may be integrated with the transceiver 20.

[0046] like Figure 3 As shown, Figure 3 Figure (a) is the linearity curve of the RF signal output by the predistorter 30. Figure 3 Figure (b) is the linearity curve of the RF signal output by the power amplifier 202. Figure 3 Figure (c) is the linearity curve of the RF signal output by the power amplifier 202 after compensation by the predistorter 30. The predistorter 30 is used to compensate for the nonlinear characteristics of the power amplifier 202. Specifically, the predistorter 30 obtains the RF signal output by the power amplifier 202 through the first feedback receiving circuit 401, thereby determining the nonlinear characteristics of the power amplifier 202, and adjusting the RF signal transmitted by the transceiver 20 to the power amplifier 202, so as to obtain a linearly amplified RF signal at the output end of the power amplifier 202. The nonlinear characteristics of the predistorter 30 are opposite to the nonlinear characteristics of the power amplifier 202, that is, the nonlinear characteristics of the predistorter 30 and the nonlinear characteristics of the power amplifier 202 compensate each other, so that the combination of the two exhibits a linear amplification effect.

[0047] The first feedback receiving circuit 401 is a feedback circuit for acquiring the nonlinear characteristics of the power amplifier 202. One end of the first feedback receiving circuit 401 is coupled to the first transmission line 203, and the other end of the first feedback receiving circuit 401 is electrically connected to the predistorter 30. The first feedback receiving circuit 401 and the first transmission line 203 may be directly or indirectly coupled, and the first feedback receiving circuit 401 and the predistorter 30 may be directly or indirectly electrically connected.

[0048] The second feedback receiving circuit 501 is a feedback circuit for collecting signals from the input end of the antenna radiator 10. One end of the second feedback receiving circuit 501 is coupled to the second transmission line 205, and the other end of the second feedback receiving circuit 501 is electrically connected to the transceiver 20. The second feedback receiving circuit 501 and the second transmission line 205 can be directly or indirectly coupled, and the second feedback receiving circuit 501 and the transceiver 20 can be directly or indirectly electrically connected.

[0049] The radio frequency system 100 provided in the present application includes an antenna radiator 10, a transceiver 20, a transmitting circuit, a predistorter 30, a first feedback receiving line 401 and a second feedback receiving line 501. The transmitting circuit includes a power amplifier 202, a first transmission line 203, a filter 204 and a second transmission line 205. The transceiver 20 is electrically connected to the input end of the power amplifier 202, the first transmission line 203 is electrically connected between the output end of the power amplifier 202 and the input end of the filter 204, the second transmission line 205 is electrically connected between the output end of the filter 204 and the input end of the antenna radiator 10, the predistorter 30 is electrically connected before the input end of the power amplifier 202, and is used to compensate for the nonlinear characteristics of the power amplifier 202. One end of the first feedback receiving line 401 is coupled to the first transmission line 203, and the other end of the first feedback receiving line 401 is electrically connected to the predistorter 30. 0, one end of the second feedback receiving line 501 is coupled to the second transmission line 205, and the other end of the second feedback receiving line 501 is electrically connected to the transceiver 20. In this way, the first feedback receiving line 401 is coupled to the rear end of the power amplifier 202 and the front end of the filter 204, so that the signal fed back by the first feedback receiving line 401 is not affected by the filter 204. This can prevent the predistorter 30 from misjudging the nonlinearity of the power amplifier 202, resulting in overcompensation or undercompensation of the nonlinearity of the power amplifier 202. In other words, the linearity of the power amplifier 202 can be compensated more accurately. The second feedback receiving line 501 is coupled to the rear end of the filter 204 and the front end of the antenna radiator 10, so that the signal fed back by the second feedback receiving line 501 is closer to the signal at the input end of the antenna radiator 10, which helps to ensure the accuracy of power control and thus achieve a precise balance between the efficiency and linearity of the power amplifier 202.

[0050] Please refer to Figure 4 and Figure 5 , Figure 4 for Figure 1 The radio frequency system 100 shown is a structural diagram including a first coupler 402 and a second coupler 502. Figure 5 for Figure 2The RF system 100 shown is a schematic structural diagram including a first coupler 402 and a second coupler 502. In one possible implementation, the RF system 100 further includes the first coupler 402 and the second coupler 502. The first feedback receiving line 401 is coupled to the first transmission line 203 via the first coupler 402, and the second feedback receiving line 501 is coupled to the second transmission line 205 via the second coupler 502.

[0051] In one possible embodiment, please refer to Figure 6 and Figure 7 The first transmission line 203 includes a first sub-transmission line 230 and a second sub-transmission line 231. The first coupler 402 includes a first electrical connection port A, a second electrical connection port B, a third electrical connection port C, and a fourth electrical connection port D. The first sub-transmission line 230 is electrically connected between the first electrical connection port A and the output end of the power amplifier 202, the second sub-transmission line 231 is electrically connected between the second electrical connection port B and the input end of the filter 204, the first feedback receiving line 401 is electrically connected between the third electrical connection port C and the predistorter 30, and the fourth electrical connection port D is grounded.

[0052] The second transmission line 205 includes a third sub-transmission line 250 and a fourth sub-transmission line 251. The second coupler 502 includes a fifth electrical connection port E, a sixth electrical connection port F, a seventh electrical connection port G and an eighth electrical connection port H. The third sub-transmission line 250 is electrically connected between the fifth electrical connection port E and the output end of the power amplifier 202. The fourth sub-transmission line 251 is electrically connected between the sixth electrical connection port F and the input end of the filter 204. The second feedback receiving line 501 is electrically connected between the seventh electrical connection port G and the transceiver 20. The eighth electrical connection port H is grounded.

[0053] Of course, in other possible embodiments, the RF signal on the first transmission line 203 may be first coupled to the first coupler 402 and then coupled to the first feedback receiving line 401 through the first coupler 402. The RF signal on the second transmission line 205 may be first coupled to the second coupler 502 and then coupled to the second feedback receiving line 501 through the second coupler 502. In this embodiment, the first electrical connection port A and the second electrical connection port B of the first coupler 402 are coupled to the first transmission line 203, the third electrical connection port C of the first coupler 402 is electrically connected to the first feedback receiving line 401, the fifth electrical connection port E and the sixth electrical connection port F of the second coupler 502 are coupled to the second transmission line 205, and the seventh electrical connection port G of the second coupler 502 is electrically connected to the second feedback receiving line 501.

[0054] In this embodiment, the first feedback receiving line 401 is coupled to the first transmission line 203 via the first coupler 402 , and the second feedback receiving line 501 is coupled to the second transmission line 205 via the second coupler 502 , which is conducive to achieving good isolation and impedance matching effects for the RF system 100 .

[0055] In one possible implementation, please refer to Figure 2 、 Figure 5 and Figure 7 The transceiver 20 is integrated with the predistorter 30. The predistorter 30 includes a digital predistortion (DPD) circuit. It can be understood that the transceiver 20 and the predistorter 30 form a whole.

[0056] This embodiment facilitates the electrical connection of the transceiver 20 and the predistorter 30 to the power amplifier 202 via the same transmit port N, and facilitates the electrical connection of the transceiver 20 and the predistorter 30 to the first feedback receiving circuit 401 and the second feedback receiving circuit 501 via the same feedback port M. Furthermore, integrating the transceiver 20 and the predistorter 30 can improve the operating efficiency of the RF system 100, save space, and enhance packaging reliability.

[0057] Of course, in other possible implementations, please refer to Figure 1 、 Figure 4 and Figure 6 The predistorter 30 can be electrically connected between the transmit port of the transceiver 20 and the input of the power amplifier 202. The transmit port of the transceiver 20 and the output port of the predistorter 30 can be different. In this embodiment, the RF signal transmitted by the transceiver 20 is transmitted to the power amplifier 202 via the predistorter 30.

[0058] Regardless of whether the transceiver 20 and the predistorter 30 are integrated together, the predistorter 30 needs to perform nonlinear processing on the RF signal transmitted by the transceiver 20 based on the signal fed back by the first feedback receiving circuit 401, so that the nonlinear characteristics of the processed RF signal can offset the nonlinear characteristics of the power amplifier 202, thereby obtaining a linearly amplified RF signal at the output end of the power amplifier 202.

[0059] In one possible implementation, please refer to Figure 2 、 Figure 5 and Figure 7 The transceiver 20 includes a feedback port M, and the RF system 100 also includes a switching switch 60, the fixed end of the switching switch 60 is electrically connected to the feedback port M, and the selection end of the switching switch 60 is electrically connected and switched between the other end of the first feedback receiving circuit 401 and the other end of the second feedback receiving circuit 501.

[0060] It is understandable that the first feedback receiving circuit 401 and the second feedback receiving circuit 501 share the same feedback port M. When the selector terminal of the switch 60 is connected to the first feedback receiving circuit 401, the first feedback receiving circuit 401 can feed back information carrying the nonlinear characteristics of the power amplifier 202 to the predistorter 30, thereby enabling the predistorter 30 to compensate for the nonlinearity of the power amplifier 202. When the selector terminal of the switch 60 is connected to the second feedback receiving circuit 501, the second feedback receiving circuit 501 can feed back information carrying the power of the RF signal to the transceiver 20, thereby enabling the transceiver 20 to adjust the power of the transmitted RF signal in real time, so that the power amplifier 202 operates in a high-efficiency region.

[0061] In this embodiment, the configuration of the switch 60 can implement switching between the first feedback receiving circuit 401 and the second feedback receiving circuit 501, thereby facilitating the first feedback receiving circuit 401 and the second feedback receiving circuit 501 to operate in different time periods. In addition, the transceiver 20 and the predistorter 30 share the same feedback port M, which is beneficial for improving the integration of the RF system 100 and simplifying the structure of the RF system 100.

[0062] Of course, in other possible implementations, the RF system 100 may include a first feedback port and a second feedback port. The other end of the first feedback receiving circuit 401 may be electrically connected to the predistorter 30 via the first feedback port, and the other end of the second feedback receiving circuit 501 may be electrically connected to the transceiver 20 via the second feedback port. In this implementation, the first feedback port and the second feedback port are independently provided.

[0063] In addition, in this embodiment, a first switch may be provided between the first feedback port and the first feedback receiving circuit 401 to control the switching of the feedback loop formed by the predistorter 30 and the first feedback receiving circuit 401. A second switch may be provided between the second feedback port and the second feedback receiving circuit 501 to control the switching of the feedback loop formed by the transceiver 20 and the second feedback receiving circuit 501.

[0064] In one possible implementation, Figure 8 As shown, the radio frequency system 100 further includes a controller 70 , which is electrically connected to the switch 60 . The controller 70 controls the switch 60 based on a time division control principle.

[0065] Specifically, the controller 70 controls the selection end of the switch 60 to be connected to the first feedback receiving line 401 at the first preset time. The controller 70 controls the selection end of the switch 60 to be connected to the second feedback receiving line 501 at the second preset time.

[0066] The first preset time and the second preset time may be stored in advance so as to be called by the controller 70 .

[0067] In a possible embodiment, the first preset time may include a plurality of intervals of first sub-preset times, and the second preset time may be interspersed in the intervals between the plurality of first sub-preset times.

[0068] By controlling the switch 60 through the controller 70 , automatic control of switching feedback between the first feedback receiving circuit 401 and the second feedback receiving circuit 501 can be achieved.

[0069] Please refer to Figure 2 、 Figure 5 and Figure 7 In a possible implementation, the transceiver 20 includes a transmit port N, the transceiver 20 is electrically connected to the input end of the power amplifier 202 through the transmit port N, and the predistorter 30 is electrically connected to the input end of the power amplifier 202 through the transmit port N.

[0070] It is understandable that when the transceiver 20 and the predistorter 30 are integrated together, the transceiver 20 and the predistorter 30 may share the same transmit port N. The RF signal transmitted by the transmitter is processed by the predistorter 30 and then transmitted to the power amplifier 202 through the transmit port N.

[0071] In this embodiment, the transceiver 20 and the predistorter 30 share the same transmit port N, which is beneficial to improving the integration of the radio frequency system 100 and simplifying the structure of the radio frequency system 100 .

[0072] In a possible implementation, the antenna radiator 10 supports one of cellular communication, WIFI communication, and satellite communication.

[0073] Optionally, the antenna radiator 10 supports cellular communication; or, the antenna radiator 10 supports WIFI communication; or, the antenna radiator 10 supports satellite communication.

[0074] In a possible implementation, the radio frequency system 100 includes a plurality of the antenna radiators 10 , a plurality of the transmitting circuits, a plurality of the first feedback receiving circuits 401 , and a plurality of the second feedback receiving circuits 501 .

[0075] In other words, the radio frequency system 100 includes at least two antenna radiators 10 , at least two transmitting circuits, at least two first feedback receiving circuits 401 and at least two second feedback receiving circuits 501 .

[0076] In one possible embodiment, the radio frequency system 100 includes the same number of antenna radiators 10, the same number of transmitting circuits, the same number of first feedback receiving circuits 401, and the same number of second feedback receiving circuits 501. In this embodiment, one first feedback receiving circuit 401 is coupled between the output of one power amplifier 202 and the input of one filter 204, and one second feedback receiving circuit 501 is coupled between the output of one filter 204 and the input of one antenna radiator 10. That is, one end of one first feedback receiving circuit 401 is coupled to one first transmission line 203, and one end of one second feedback receiving circuit 501 is coupled to one second transmission line 205.

[0077] This embodiment is conducive to realizing Multiple-Input Multiple-Output (MIMO) wireless communication technology.

[0078] In addition, if Figure 9 As shown, the present application also provides a terminal 1000. The terminal 1000 can be a mobile terminal, including but not limited to a mobile phone, tablet, watch, bracelet, etc. In the embodiments of the present application, the terminal 1000 takes a mobile phone as an example. The terminal 1000 includes a device body 11 and a radio frequency system 100 as described in any of the above embodiments. The radio frequency system 100 is provided on the device body 11.

[0079] In one possible embodiment, the device body 11 may include a display screen and a housing. A housing space is formed between the display screen and the housing. The transceiver 20, transmit circuit, predistorter 30, first feedback receive circuit 401, and second feedback receive circuit 501 of the RF system 100 may be disposed within the housing space. Furthermore, the device body 11 may include a circuit board disposed within the housing space. The transceiver 20, transmit circuit, predistorter 30, first feedback receive circuit 401, and second feedback receive circuit 501 of the RF system 100 may be disposed on the circuit board. The antenna radiator 10 of the RF system 100 may be disposed within the housing space or integrated into the housing.

[0080] Furthermore, the present application also provides a method for controlling radio frequency signals. Figure 10 As shown, Figure 10 This is a flowchart of a method for controlling radio frequency signals provided in an embodiment of the present application. The method for controlling radio frequency signals is executed in the radio frequency system 100 described in any of the above embodiments. The structures included in the radio frequency system 100 described in the following embodiments continue to use the above reference numerals. The method for controlling radio frequency signals includes, but is not limited to, steps S10, S20, S30, and S40.

[0081] S10: Acquire the first signal fed back by the first feedback receiving circuit 401.

[0082] S20: Perform predistortion processing on the transmitted radio frequency signal according to the first signal.

[0083] S30: Acquire the second signal fed back by the second feedback receiving circuit 501.

[0084] S40: Power-adjusting the transmitted radio frequency signal according to the second signal.

[0085] Step S10 and step S30 can be performed simultaneously; alternatively, step S10 can precede step S30; alternatively, step S30 can precede step S10. Step S20 and step S40 can be performed simultaneously; alternatively, step S20 can precede step S40; alternatively, step S40 can precede step S20. Step S20 is performed after step S10. Step S40 is performed after step S30.

[0086] The first signal fed back by the first feedback receiving circuit 401 is a radio frequency signal transmitted after the power amplifier 202 and before the filter 204. The first signal carries information about the nonlinear characteristics of the power amplifier 202. Predistortion processing of the transmitted radio frequency signal based on the first signal includes making the nonlinear characteristics of the radio frequency signal input to the power amplifier 202 opposite to the nonlinear characteristics of the power amplifier 202 itself.

[0087] The second signal fed back by the second feedback receiving circuit 501 is the RF signal transmitted after the filter 204 and before the antenna radiator 10. The second signal carries power information of the RF signal at the input end of the antenna radiator 10. Power adjustment of the transmitted RF signal based on the second signal includes reducing the power of the RF signal transmitted to the power amplifier 202 or increasing the power of the RF signal transmitted to the power amplifier 202.

[0088] In one possible implementation, please refer to Figure 10 and Figure 11 , step S10 includes but is not limited to the following step S101.

[0089] S101: Acquire a first signal fed back by the first feedback receiving circuit 401 at a first preset time.

[0090] In one possible implementation, please refer to Figure 10 and Figure 11 , step S30 includes but is not limited to the following step S301.

[0091] S301: Acquire a second signal fed back by the second feedback receiving circuit 501 at a second preset time.

[0092] The first preset time and the second preset time can be stored in advance so as to be directly called when needed.

[0093] In one possible embodiment, the first preset time may include a plurality of intervals of first sub-preset time periods, and the second preset time may be interspersed between the plurality of intervals of the first sub-preset time periods. In other words, the first signal may be fed back via the first feedback receiving line 401 during an idle time of the second feedback receiving line 501.

[0094] This embodiment controls the working time of the first feedback receiving line 401 and the second feedback receiving line 501 based on the time division control principle, and has the characteristics of simple control and low implementation cost.

[0095] The features mentioned in the specification, claims, and drawings may be combined with each other in any manner as long as they are meaningful within the scope of this application. The advantages and features described for the radio frequency system 100 are applicable to the terminal 1000 and the radio frequency signal control method in a corresponding manner.

[0096] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A radio frequency system, characterized in that: include: Antenna radiator; transceiver; A transmitting circuit, comprising a power amplifier, a first transmission line, a filter, and a second transmission line, wherein the input end of the power amplifier is electrically connected to the transceiver, the first transmission line is electrically connected between the output end of the power amplifier and the input end of the filter, and the second transmission line is electrically connected between the output end of the filter and the input end of the antenna radiator; a predistorter, the predistorter being electrically connected before the input terminal of the power amplifier, the predistorter being used to compensate for the nonlinear characteristics of the power amplifier; a first feedback receiving circuit, wherein one end of the first feedback receiving circuit is coupled to the first transmission circuit, and the other end of the first feedback receiving circuit is electrically connected to the predistorter; and A second feedback receiving line, one end of the second feedback receiving line is coupled to the second transmission line, and the other end of the second feedback receiving line is electrically connected to the transceiver.

2. The radio frequency system according to claim 1, characterized in that The radio frequency system further includes a first coupler and a second coupler. The first feedback receiving line is coupled to the first transmission line via the first coupler, and the second feedback receiving line is coupled to the second transmission line via the second coupler.

3. The radio frequency system according to claim 1, wherein: The transceiver is integrated with the predistorter.

4. The radio frequency system according to claim 3, wherein: The transceiver includes a feedback port, and the radio frequency system further includes a switching switch, wherein a fixed end of the switching switch is electrically connected to the feedback port, and a selection end of the switching switch is electrically connected and switched between the other end of the first feedback receiving circuit and the other end of the second feedback receiving circuit.

5. The radio frequency system according to claim 4, characterized in that The radio frequency system further includes a controller, which is electrically connected to the switch and controls the switch based on a time division control principle.

6. The radio frequency system according to claim 3, characterized in that The transceiver includes a transmitting port, the transceiver is electrically connected to the input end of the power amplifier through the transmitting port, and the predistorter is electrically connected to the input end of the power amplifier through the transmitting port.

7. The radio frequency system according to claim 1, wherein: The antenna radiator supports one of cellular communication, WIFI communication, and satellite communication.

8. A terminal, characterized in that: The device comprises a device body and a radio frequency system according to any one of claims 1 to 7, wherein the radio frequency system is arranged on the device body.

9. A method for controlling a radio frequency signal, characterized in that: The radio frequency system implemented in any one of claims 1 to 7 comprises: Acquire a first signal fed back by the first feedback receiving circuit; performing predistortion processing on the transmitted radio frequency signal according to the first signal; Acquire a second signal fed back by the second feedback receiving circuit; The power of the transmitted radio frequency signal is adjusted according to the second signal.

10. The method according to claim 9, characterized in that The obtaining of the first signal fed back by the first feedback receiving line includes: Acquire a first signal fed back by the first feedback receiving circuit at a first preset time; Acquiring a second signal fed back by the second feedback receiving line includes: A second signal fed back by the second feedback receiving circuit is obtained at a second preset time.

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