Terminal, signal transmitting circuit, signal receiving circuit and wireless communication method

Abstract

The invention discloses a terminal, a signal transmitting circuit, a signal receiving circuit and a wireless communication method, and belongs to the technical field of wireless communication. The terminal comprises a signal transmitting circuit and a signal receiving circuit, wherein at least one of the signal transmitting circuit and the signal receiving circuit comprises a switch module; under the condition that the signal transmitting circuit comprises the switch module, the switch module is controlled to enable the signal transmitting circuit to be switched between a first working state and a second working state, so that the signal-to-noise ratio of a signal received by the terminal is adjusted; and under the condition that the signal receiving circuit comprises the switch module, the switch module is controlled to enable the signal receiving circuit to be switched between a third working state and a fourth working state, so that the signal-to-noise ratio of a signal received by the terminal is adjusted.

Description

Technical Field

[0001] The present application belongs to the field of wireless communication technology, and specifically relates to a terminal, a signal transmitting circuit, a signal receiving circuit, and a wireless communication method. Background Art

[0002] When a mobile phone communicates with a base station, its transceiver performance depends on multiple factors, including hardware design, software optimization, and the network environment. In certain scenarios, such as corridors or underground parking lots, mobile phones can experience high latency, high packet loss, or even lag, resulting in poor transceiver performance. Therefore, improving mobile phone transceiver performance is an urgent issue. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a terminal, a signal transmitting circuit, a signal receiving circuit and a wireless communication method, which can improve the transmitting and receiving performance of the terminal.

[0004] In a first aspect, an embodiment of the present application provides a terminal, including: a signal transmitting circuit and a signal receiving circuit, at least one of the signal transmitting circuit and the signal receiving circuit comprising a switch module; When the signal transmitting circuit includes the switch module, controlling the switch module to switch the signal transmitting circuit between a first working state and a second working state, so as to adjust a signal-to-noise ratio of a signal received by the terminal; When the signal receiving circuit includes the switch module, the switch module is controlled to switch the signal receiving circuit between the third working state and the fourth working state, so as to adjust the signal-to-noise ratio of the signal received by the terminal.

[0005] In a second aspect, an embodiment of the present application provides a signal transmission circuit for a terminal, comprising: a filtering circuit, wherein the filtering circuit comprises at least one filtering branch, wherein the filtering branch comprises: a first filter resonator connected between the input terminal and the output terminal of the filter circuit, wherein the first filter resonator is electrically connected to the ground terminal; a switch, wherein a first end of the switch is electrically connected to the input end of the filter circuit, and a second end of the switch is connected to the first filter resonator; When the switch is in the open state, the first filter resonator participates in filtering, and the signal transmitting circuit is in the first working state; when the switch is in the closed state, the first filter resonator is short-circuited, and the signal transmitting circuit is in the second working state.

[0006] In a third aspect, an embodiment of the present application provides a terminal, comprising the signal transmission circuit as described in the second aspect above.

[0007] In a fourth aspect, an embodiment of the present application provides a signal receiving circuit for a terminal, comprising: an antenna, a signal receiving end, a filter, and a low-noise amplifier; One end of the low noise amplifier is connected to the antenna, and the other end of the low noise amplifier is connected to the filter; One end of the filter is connected to the low noise amplifier, and the other end of the filter is connected to the signal receiving end.

[0008] In a fifth aspect, an embodiment of the present application provides a terminal comprising the signal receiving circuit as described in the fourth aspect above.

[0009] In a sixth aspect, an embodiment of the present application provides a wireless communication method, applied to the terminal described in the first aspect, the third aspect, or the fifth aspect, including: The terminal obtains a terminal signal-to-noise ratio of a received signal; The terminal obtains a base station signal-to-noise ratio of a received signal fed back by the base station; When the signal-to-noise ratio of the terminal is greater than the signal-to-noise ratio of the base station, or when the difference between the signal-to-noise ratio of the terminal and the demodulation threshold is greater than the difference between the signal-to-noise ratio of the base station and the demodulation threshold, tuning the antenna so that the resonant frequency of the antenna is closer to the transmission frequency point of the signal transmitting circuit; When the signal-to-noise ratio of the terminal is less than the signal-to-noise ratio of the base station, or when the difference between the signal-to-noise ratio of the terminal and the demodulation threshold is less than the difference between the signal-to-noise ratio of the base station and the demodulation threshold, the antenna is tuned so that the resonant frequency of the antenna is closer to the receiving frequency of the signal receiving circuit.

[0010] In the seventh aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the sixth aspect are implemented.

[0011] In an eighth aspect, an embodiment of the present application provides a computer program product, which is stored in a storage medium and is executed by at least one processor to implement the steps of the method described in the sixth aspect.

[0012] The terminal described in the first aspect above controls the signal transmitting circuit to switch between the first working state and the second working state through the switch module to adjust the signal-to-noise ratio of the signal received by the terminal, thereby improving the transmission performance of the terminal; and / or controls the signal receiving circuit to switch between the third working state and the fourth working state through the switch module to adjust the signal-to-noise ratio of the signal received by the terminal, thereby improving the receiving performance of the terminal.

[0013] The signal transmission circuit described in the second aspect can control whether the first filter resonator participates in filtering by turning the switch on and off, thereby dynamically adjusting the order of the filter circuit and improving the performance of the signal transmission circuit.

[0014] The terminal described in the third aspect can control whether the first filter resonator participates in filtering by turning on and off the switch in the signal transmission circuit, thereby dynamically adjusting the order of the filter circuit and improving the transmission performance of the terminal.

[0015] The signal receiving circuit described in the fourth aspect above, by controlling the signal received by the antenna to be first amplified and then filtered before being output to the signal receiving end, can eliminate the influence of filtering on the noise coefficient, reduce the noise coefficient, and improve the signal-to-noise ratio of the received signal, thereby improving the performance of the signal receiving circuit.

[0016] The terminal described in the fifth aspect above controls the signal received by the antenna through the signal receiving circuit to first amplify and then filter the signal before outputting it to the signal receiving end. This can eliminate the influence of filtering on the noise coefficient, reduce the noise coefficient, and improve the signal-to-noise ratio of the received signal, thereby improving the receiving performance of the terminal.

[0017] The wireless communication method described in the sixth aspect above tunes the antenna so that the resonant frequency of the antenna is closer to the transmitting frequency point of the signal transmitting circuit or closer to the receiving frequency point of the signal receiving circuit based on the terminal signal-to-noise ratio and the base station signal-to-noise ratio. This can dynamically adjust the terminal's transmission efficiency and receiving efficiency, thereby improving the terminal's transceiver performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present application; Figure 2 This is a schematic structural diagram of a filtering branch provided in an embodiment of the present application; Figure 3 This is a schematic structural diagram of another filtering branch provided in an embodiment of the present application; Figure 4 This is a schematic structural diagram of a signal receiving circuit provided in an embodiment of the present application; Figure 5 is a structural diagram of another signal receiving circuit provided in an embodiment of the present application; Figure 6 is a schematic diagram of a third working state of the signal receiving circuit provided in an embodiment of the present application; Figure 7 is a schematic diagram of a fourth working state of the signal receiving circuit provided in an embodiment of the present application; Figure 8 This is a structural diagram of a filter circuit provided in an embodiment of the present application; Figure 9is a structural diagram of another filter circuit provided in an embodiment of the present application; Figure 10 This is a structural diagram of a duplexer provided in an embodiment of the present application; Figure 11 This is a flow chart of a filtering control method provided in an embodiment of the present application; Figure 12 1 is a flow chart of another filtering control method provided in an embodiment of the present application; Figure 13 This is a flow chart of another filtering control method provided in an embodiment of the present application; Figure 14 This is a schematic structural diagram of a signal receiving circuit provided in an embodiment of the present application; Figure 15 This is a flow chart of a control method for a signal receiving circuit provided in an embodiment of the present application; Figure 16 This is a flow chart of a wireless communication method provided by an embodiment of the present application; Figure 17 This is a flow chart of another wireless communication method provided by an embodiment of the present application; Figure 18 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0020] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0021] Currently, in frequency division duplex (FDD) mode, a duplexer is typically used to separate transmit and receive signals. The isolation between the transmit port (Tx) and receive port (Rx) of a duplexer is generally required to exceed 55dB. To achieve this isolation requirement, the duplexer design inevitably increases the number of stages, which also increases the duplexer's insertion loss. However, in some low-power transmission scenarios or with better reception performance, the isolation between Tx and Rx does not require such high levels. This results in redundant duplexer isolation design in some scenarios. For example, a 1dB reduction in duplexer insertion loss can save 25% of the PA's transmit power consumption.

[0022] In light of this, embodiments of the present application provide a signal transmission circuit that controls whether the filter circuit in the signal transmission circuit is downgraded by turning a switch in the signal transmission circuit on and off. This allows for dynamic adjustment of the filter circuit's order, thereby improving the performance of the signal transmission circuit. Applying this signal transmission circuit to filter the transmitted signal in a duplexer can optimize the duplexer's insertion loss, increase transmit power, and reduce transmit power consumption. Applying this signal transmission circuit to a terminal can improve the terminal's transmit performance.

[0023] Currently, terminal receiver sensitivity is related to the thermal noise power within the bandwidth, the system noise figure, and the demodulation signal-to-noise ratio. The thermal noise power is fixed, while the demodulation signal-to-noise ratio depends on receiver performance. Therefore, the primary approach to optimizing sensitivity is to reduce the system noise figure in the RF front-end receive path. In time division duplexing (TDD) mode, a switch-shorting filter solution (TDD bypass) can be used to reduce insertion loss in the receive path, lowering the noise figure and improving sensitivity by 1.5-2dB in weak signal scenarios. However, in FDD mode, the FDD bypass solution cannot improve sensitivity.

[0024] In view of this, embodiments of the present application provide a signal receiving circuit for receiving signals in FDD mode. By controlling the signal received by the antenna to be amplified and then filtered before being output to the signal receiving end, the effects of filtering on the noise figure can be eliminated, the noise figure can be reduced, the signal-to-noise ratio of the received signal can be improved, and the sensitivity can be increased, thereby improving the performance of the signal receiving circuit. Application of this signal receiving circuit to a terminal can improve the terminal's reception performance.

[0025] Currently, because transmit and receive frequencies in FDD mode are not aligned, antennas are designed with varying transmit and receive efficiencies. Furthermore, these fixed transmit and receive efficiencies during communication make it impossible to manage the unbalanced demands for transmit and receive performance in complex environments. Packet loss on a mobile phone can sometimes indicate a critical point in transmit performance, while other times it can indicate a critical point in receive performance. With these fixed transmit and receive efficiencies, it's difficult to fully utilize the terminal's transmit and receive performance.

[0026] In view of this, an embodiment of the present application provides a wireless communication method, which tunes the antenna so that the antenna's resonant frequency is closer to the transmitting frequency point of the signal transmitting circuit or closer to the receiving frequency point of the signal receiving circuit based on the terminal signal-to-noise ratio and the base station signal-to-noise ratio. This can dynamically adjust the terminal's transmission efficiency and receiving efficiency, thereby improving the terminal's transceiver performance.

[0027] The following, in conjunction with the accompanying drawings, describes in detail the terminal, signal transmitting circuit, signal receiving circuit and wireless communication method provided in the embodiments of the present application through specific embodiments and their application scenarios.

[0028] Figure 1 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present application. Figure 1 As shown, the terminal includes: a signal transmitting circuit 1 and a signal receiving circuit 2 , and at least one of the signal transmitting circuit 1 and the signal receiving circuit 2 includes a switch module 100 .

[0029] The signal transmitting circuit 1 includes a switch module 100, or the signal receiving circuit 2 includes a switch module 100, or the signal transmitting circuit 1 and the signal receiving circuit 2 each include a switch module 100 ( Figure 1 ), not specifically limited.

[0030] In the embodiment of the present application, when the signal transmitting circuit 1 includes the switch module 100, the switch module 100 is controlled to switch the signal transmitting circuit 1 between the first working state and the second working state to adjust the signal-to-noise ratio of the signal received by the terminal.

[0031] The signal transmission circuit 1 includes a filter circuit, which includes a filter branch. A first operating state indicates that the filter branch participates in filtering, while a second operating state indicates that the filter branch does not participate in filtering. When the signal transmission circuit 1 switches from the first operating state to the second operating state, the filter circuit in the signal transmission circuit 1 is downgraded. When the signal transmission circuit 1 switches from the second operating state to the first operating state, the filter circuit in the signal transmission circuit 1 is upgraded.

[0032] In the embodiment of the present application, when the signal receiving circuit 2 includes the switch module 100, the switch module 100 is controlled to switch the signal receiving circuit 2 between the third working state and the fourth working state to adjust the signal-to-noise ratio of the signal received by the terminal.

[0033] The signal receiving circuit 2 includes a low-noise amplifier for amplification and a filter for filtering. The third working state refers to the working state in which the signal received by the signal receiving circuit 2 is first amplified by the low-noise amplifier and then filtered by the filter. The fourth working state refers to the working state in which the signal received by the signal receiving circuit 2 is first filtered by the filter and then amplified by the low-noise amplifier. Switching the signal receiving circuit 2 from the third working state to the fourth working state refers to switching from a working state in which amplification is first performed and then filtered to a working state in which filtering is first performed and then amplification is performed. Switching the signal receiving circuit 2 from the fourth working state to the third working state refers to switching from a working state in which filtering is first performed and then amplification to a working state in which amplification is first performed and then filtering is performed.

[0034] In the embodiment of the present application, the signal transmission circuit 1 in the terminal may include a filter circuit, which may include at least one filter branch 11. The number of filter branches 11 in the filter circuit is not specifically limited. For example, the filter circuit in the signal transmission circuit 1 may include one, two, three, four, or five filter branches 11.

[0035] Figure 2 This is a structural diagram of a filter branch provided in an embodiment of the present application. Figure 2 As shown, the filter circuit in the signal transmission circuit 1 in the terminal includes a filter branch 11 as an example for description, wherein the filter branch 11 may include: a first filter resonator 10 and a switch module 100 .

[0036] The first filter resonator 10 is connected between the input end and the output end of the filter circuit, and the first filter resonator 10 is electrically connected to the ground end.

[0037] The switch module 100 includes a switch 20 connected to the input end of the filter circuit and the first filter resonator 10 respectively.

[0038] When switch 20 is open, first filter resonator 10 participates in filtering, and signal transmission circuit 1 is in a first operating state. When switch 20 is closed, first filter resonator 10 is short-circuited, and signal transmission circuit 1 is in a second operating state. Signal transmission circuit 1 adjusts the signal-to-noise ratio of the signal received by the terminal by controlling the on and off state of switch 20.

[0039] Figure 3 This is a structural diagram of another filtering branch provided in an embodiment of the present application. Figure 3 As shown, in the embodiment of the present application, Figure 2 Based on the above, the filtering branch 11 may further include: The second filter resonator 30 has one end connected to the first filter resonator 10 and the output end of the filter circuit through a first node D, and the other end of the second filter resonator 30 is electrically connected to the ground end.

[0040] One end of the switch 20 is connected to the first filter resonator 10 via the first node D, and the other end of the switch 20 is connected to the input end of the filter circuit.

[0041] Wherein, when the switch 20 is in the off state, the first filter resonator 10 and the second filter resonator 30 both participate in filtering, and the signal transmitting circuit 1 is in the first working state.

[0042] If the switch 20 is switched from an open state to a closed state, the first filter resonator 10 is short-circuited. In this case, the order of the filter circuit is reduced by one, thereby achieving a reduction in the order of the filter circuit.

[0043] In one embodiment, the filter circuit may include multiple filter branches 11. The first filter resonators 10 in the multiple filter branches 11 are connected in series between the input and output ends of the filter circuit, a first node D between two adjacent first filter resonators 10 is grounded, and the first node D between two adjacent first filter resonators 10 is connected to the input end of the filter circuit via a switch 20.

[0044] In another embodiment, the filter circuit may include multiple filter branches 11. The first filter resonators 10 in the multiple filter branches 11 are connected in series between the input and output ends of the filter circuit, a first node D between two adjacent first filter resonators 10 is grounded via a second filter resonator 30, and the first node D between two adjacent first filter resonators 10 is connected to the input end of the filter circuit via a switch 20.

[0045] In the embodiment of the present application, the filter circuit may include at least two filter branches, including a first filter branch. For example, the filter circuit may include a first filter branch and a second filter branch.

[0046] The switch 20 in the first filtering branch is in the off state, the first filtering branch participates in filtering, the signal transmitting circuit 1 is in the first working state, and the signal received by the terminal has a first signal-to-noise ratio.

[0047] When the switch 20 in the first filter branch is closed, the first filter resonator 10 in the first filter branch is short-circuited (the first filter branch does not participate in filtering), the signal transmitting circuit 1 is in the second working state, and the signal received by the terminal has a second signal-to-noise ratio.

[0048] In one embodiment, when the signal transmission circuit 1 switches from the first operating state to the second operating state (degraded), if the second signal-to-noise ratio is less than the first signal-to-noise ratio, or the difference between the second signal-to-noise ratio and the demodulation threshold is less than a preset value, the terminal switches the signal transmission circuit 1 from the second operating state to the first operating state by opening the switch in the first filtering branch. This preset value can be pre-set as needed, and the specific value is not limited.

[0049] Among them, switching from the first working state to the second working state belongs to the scenario of filter circuit downgrading. In this scenario, if the signal-to-noise ratio after downgrading is less than the signal-to-noise ratio before downgrading (that is, the second signal-to-noise ratio is less than the first signal-to-noise ratio), or the difference between the second signal-to-noise ratio and the demodulation threshold is less than a preset value, it means that the downgrading has affected the transmission performance of the terminal, resulting in degraded transmission performance. Therefore, it is necessary to switch from the current state back to the state before downgrading, that is, switch from the second working state to the first working state, to ensure the transmission performance of the terminal.

[0050] In another embodiment, when the signal transmitting circuit 1 switches from the first operating state to the second operating state, if the second signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio, or the difference between the second signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the terminal maintains the closed state of the switch in the first filtering branch, causing the signal transmitting circuit 1 to continue operating in the second operating state. This preset value can be pre-set as needed, and the specific value is not limited.

[0051] The switch from the first operating state to the second operating state occurs when the filter circuit is downgraded. In this scenario, if the signal-to-noise ratio after downgrading is greater than or equal to the signal-to-noise ratio before downgrading (i.e., the second signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio), or if the difference between the second signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the downgrading has not affected the terminal's transmit performance. Therefore, the current state, i.e., the downgraded state, can be maintained without switching operating states. This implementation allows downgrading the filter circuit without degrading the terminal's transmit performance, optimizing the insertion loss of the terminal's duplexer and enabling the duplexer to operate in a state where transmission does not interfere with reception, thereby increasing transmit power and reducing transmit power consumption.

[0052] Figure 4 This is a schematic diagram of the structure of a signal receiving circuit provided by an embodiment of the present application. Figure 4 As shown, in the embodiment of the present application, the signal receiving circuit 2 in the terminal may include: an antenna 200, a signal receiving end 300, a switch module 100, a filter 400, and a low noise amplifier (LNA) 500. The signal receiving end 300 is a radio frequency transceiver.

[0053] The switch module 100 is connected between the antenna 200 and the signal receiving end 300 .

[0054] The filter 400 is connected between the antenna 200 and the signal receiving end 300 through the switch module 100 .

[0055] The low noise amplifier 500 is connected between the antenna 200 and the signal receiving end 300 through the switch module 100 .

[0056] When the signal receiving circuit 2 controls the switch module 100 to be in the third working state, the signal received by the antenna 200 is first amplified by the low noise amplifier 500 , then filtered by the filter 400 and input into the signal receiving end 300 .

[0057] When the signal receiving circuit 2 controls the switch module 100 to be in the fourth working state, the signal received by the antenna 200 is first filtered by the filter 400 , then amplified by the low noise amplifier 500 and input to the signal receiving end 300 .

[0058] In one embodiment, the switch module 100 includes a first set of switches and a second set of switches. The on / off switching of the first set of switches and the second set of switches controls the order in which the signals received by the antenna 200 are processed, i.e., amplified first and then filtered, or filtered first and then amplified.

[0059] When the first set of switches is on and the second set of switches is off, the signal receiving circuit 2 is in the third operating state. That is, when the first set of switches is on and the second set of switches is off, the signal received by the antenna 200 is first amplified by the low-noise amplifier 500, then filtered by the filter 400, and then input to the signal receiving end 300. This amplification-before-filtering approach eliminates the impact of filtering on the noise figure, reduces the noise figure, improves receiving sensitivity, and thus enhances the terminal's receiving performance.

[0060] When the first set of switches is off and the second set of switches is on, the signal receiving circuit 2 is in the fourth operating state. That is, when the first set of switches is off and the second set of switches is on, the signal received by the antenna 200 is first filtered by the filter 400, then amplified by the low-noise amplifier 500, and then input to the signal receiving end 300.

[0061] Figure 5 This is a schematic diagram of the structure of another signal receiving circuit provided by an embodiment of the present application. Figure 5 As shown, in the embodiment of the present application, the switch module 100 may include a first switch loop 600 and a second switch loop 700 .

[0062] The first switch loop 600 includes a first transistor 61 , a second transistor 62 , a third transistor 63 and a fourth transistor 64 connected in sequence, and the fourth transistor 64 is connected to the first transistor 61 .

[0063] The second switch loop 700 includes a fifth transistor 75 , a sixth transistor 76 , a seventh transistor 77 and an eighth transistor 78 connected in sequence, and the fifth transistor 75 is connected to the eighth transistor 78 .

[0064] In one embodiment, the antenna 200 is connected to the third transistor 63 and the fourth transistor 64. The signal receiving terminal 300 is connected to the seventh transistor 77 and the eighth transistor 78. One end of the low-noise amplifier 500 is connected to the first transistor 61 and the fourth transistor 64, and the other end of the low-noise amplifier 500 is connected to the fifth transistor 75 and the eighth transistor 78. One end of the filter 400 is connected to the second transistor 62 and the third transistor 63, and the other end of the filter 400 is connected to the sixth transistor 76 and the seventh transistor 77. The fifth transistor 75 and the sixth transistor 76 are connected to the first transistor 61 and the second transistor 62, respectively.

[0065] Based on the above connection relationship, the fourth transistor 64, the fifth transistor 75, the second transistor 62, and the seventh transistor 77 form a first group of switches; the third transistor 63, the sixth transistor 76, the first transistor 61, and the eighth transistor 78 form a second group of switches. This ensures that when the first group of switches is on and the second group of switches is off, the signal receiving circuit 2 is in the third operating state, and when the first group of switches is off and the second group of switches is on, the signal receiving circuit 2 is in the fourth operating state.

[0066] In the embodiment of the present application, when the signal receiving circuit 2 is in the third working state, the signal received by the antenna 200 passes through the fourth transistor 64, the low noise amplifier 500, the fifth transistor 75, the second transistor 62, the filter 400 and the seventh transistor 77 in sequence and is then input into the signal receiving end 300.

[0067] Figure 6 This is a schematic diagram of the third working state of the signal receiving circuit provided in the embodiment of the present application. Figure 6As shown, signal receiving circuit 2 is in the third operating state. The first switching loop 600 includes a first transistor 61 (FET_block1), a second transistor 62 (FET_block2), a third transistor 63 (FET_block3), and a fourth transistor 64 (FET_block4), which are connected in sequence. The fourth transistor 64 is connected to the first transistor 61. The second switching loop 700 includes a fifth transistor 75 (FET_block5), a sixth transistor 76 (FET_block6), a seventh transistor 77 (FET_block7), and an eighth transistor 78 (FET_block8), which are connected in sequence. The fifth transistor 75 is connected to the eighth transistor 78.

[0068] like Figure 6 As shown by the thick solid line, the signal received by signal receiving circuit 2 from antenna 200 first passes through fourth transistor 64 (FET_block4) and enters LNA 500 for amplification. It then passes through fifth transistor 75 (FET_block5) and second transistor 62 (FET_block2) for filtering in filter 400. Finally, it passes through seventh transistor 77 (FET_block7) and is output to signal receiving terminal 300. This amplification-before-filtering approach can be applied in scenarios where communication indicators fall below a preset threshold, such as weak signal conditions in corridors or parking lots. It can eliminate the impact of filtering on the noise figure, reduce the noise figure, improve receiver sensitivity, and enhance the terminal's receiving performance.

[0069] In the embodiment of the present application, when the signal receiving circuit 2 is in the fourth working state, the signal received by the antenna 200 passes through the third transistor 63, the filter 400, the sixth transistor 76, the first transistor 61, the low noise amplifier 500 and the eighth transistor 78 in sequence and is then input into the signal receiving end 300.

[0070] Figure 7 This is a schematic diagram of the fourth working state of the signal receiving circuit provided in the embodiment of the present application. Figure 7 As shown, signal receiving circuit 2 is in the fourth operating state. The first switching loop 600 includes a first transistor 61 (FET_block1), a second transistor 62 (FET_block2), a third transistor 63 (FET_block3), and a fourth transistor 64 (FET_block4), which are connected in sequence. The fourth transistor 64 is connected to the first transistor 61. The second switching loop 700 includes a fifth transistor 75 (FET_block5), a sixth transistor 76 (FET_block6), a seventh transistor 77 (FET_block7), and an eighth transistor 78 (FET_block8), which are connected in sequence. The fifth transistor 75 is connected to the eighth transistor 78.

[0071] like Figure 7 As shown by the thick solid line, the signal received by signal receiving circuit 2 from antenna 200 first passes through third transistor 63 (FET_block3) and then filters in filter 400. It then passes through sixth transistor 76 (FET_block6) and first transistor 61 (FET_block1) before being amplified by LNA 500. Finally, it passes through eighth transistor 78 (FET_block8) and is output to the signal receiving end. This filtering-before-amplification approach is suitable for scenarios where communication indicators are at least as low as a preset threshold, such as scenarios with moderate or strong signal strength, ensuring normal communication at the terminal.

[0072] In this embodiment of the present application, the signal received by the terminal has a third signal-to-noise ratio. Accordingly, when the third signal-to-noise ratio is less than a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is less than a preset value, the signal receiving circuit 2 can control the switch module 100 to place the signal receiving circuit 2 in the third operating state. Furthermore, when the third signal-to-noise ratio is greater than or equal to a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the signal receiving circuit 2 can control the switch module 100 to place the signal receiving circuit 2 in the fourth operating state.

[0073] The above-mentioned terminal provided in this embodiment controls the signal transmission circuit to switch between the first working state and the second working state through the switch module to adjust the signal-to-noise ratio of the signal received by the terminal, thereby improving the transmission performance of the terminal; and / or controls the signal receiving circuit to switch between the third working state and the fourth working state through the switch module to adjust the signal-to-noise ratio of the signal received by the terminal, thereby improving the receiving performance of the terminal.

[0074] An embodiment of the present application further provides a signal transmitting circuit for a terminal. The signal transmitting circuit 1 includes a filtering circuit, and the filtering circuit includes at least one filtering branch 11 .

[0075] The number of filter branches 11 represents the order of the filter circuit. For example, if there are three filter branches 11, the filter circuit is of third order; or if there are five filter branches 11, the filter circuit is of fifth order, and so on.

[0076] See also Figure 2 , the filtering circuit includes a filtering branch 11 for illustration, and the filtering branch 11 includes: a first filtering resonator 10 and a switch 20.

[0077] The first filter resonator 10 is connected between the input end and the output end of the filter circuit, and the first filter resonator 10 is electrically connected to the ground end.

[0078] The switch 20 has a first end electrically connected to the input end of the filter circuit, and a second end connected to the first filter resonator 10 .

[0079] When the switch 20 is in the open state, the first filter resonator 10 participates in filtering, and the signal transmitting circuit 1 is in the first working state. When the switch 20 is in the closed state, the first filter resonator 10 is short-circuited, and the signal transmitting circuit 1 is in the second working state.

[0080] In one embodiment, the filtering branch 11 may further include: The second filter resonator 30 has one end connected to the first filter resonator 10 and the output end of the filter circuit through a first node D, and the other end of the second filter resonator 30 is electrically connected to the ground end.

[0081] The switch 20 is connected to the first filter resonator 10 via a first node D.

[0082] Wherein, when the switch 20 is in the off state, the first filter resonator 10 and the second filter resonator 30 both participate in filtering, and the signal transmitting circuit 1 is in the first working state.

[0083] If the switch 20 is switched from an open state to a closed state, the first filter resonator 10 is short-circuited. In this case, the order of the filter circuit is reduced by one, thereby achieving a reduction in the order of the filter circuit.

[0084] In one embodiment, the filter circuit may include multiple filter branches 11. The first filter resonators 10 in the multiple filter branches 11 are connected in series between the input and output ends of the filter circuit, the first node D between two adjacent first filter resonators 10 is grounded via the second filter resonator 30, and the first node D between two adjacent first filter resonators 10 is connected to the input end of the filter circuit via the switch 20.

[0085] In one embodiment, the filter circuit includes at least two filter branches, wherein the at least two filter branches include a first filter branch. For example, the filter circuit may include a first filter branch and a second filter branch.

[0086] When the switch 20 in the first filter branch is in the open state, the first filter branch participates in filtering, and the signal transmission circuit 1 is in the first working state. When the switch 20 in the first filter branch is in the closed state, the first filter resonator 10 in the first filter branch is short-circuited, and the signal transmission circuit 1 is in the second working state.

[0087] In the embodiment of the present application, the filtering circuit in the signal transmitting circuit 1 may further include: The equipotential body 800 is connected to the input end of the filter circuit.

[0088] The first end of the switch 20 is connected to the equipotential body, and the first end of the switch 20 is electrically connected to the input end of the filter circuit through the equipotential body 800 .

[0089] Figure 8 This is a schematic diagram of the structure of a filter circuit provided in an embodiment of the present application. Figure 8 As shown, the filter circuit includes an equipotential body 800 and multiple filter branches 11. The multiple filter branches 11 are connected in series and are respectively connected to the input and output of the filter circuit. The switch 20 in each filter branch 11 is connected to the equipotential body 800. The equipotential body 800 is connected to the input of the filter circuit.

[0090] In the scenario where the filtering circuit includes the equipotential body 800 , since the potentials of any two points on the surface of the equipotential body are the same, there will be no power loss, thereby reducing the power loss of the filtering circuit during the filtering process.

[0091] Figure 9 This is a structural diagram of another filter circuit provided in an embodiment of the present application. Figure 9 As shown, a 4-order filter circuit is used as an example for explanation. The first filter branch includes a first filter resonator 10a, a switch 20a, and a second filter resonator 30a; the second filter branch includes a first filter resonator 10b, a switch 20b, and a second filter resonator 30b; and the third filter branch includes a first filter resonator 10c, a switch 20c, and a second filter resonator 30c. The fourth filter branch may include only two filter resonators without a switch. The four filter branches are connected in series and are respectively connected to the input and output ends of the filter circuit. One end of the equipotential body 800 is connected to the input end of the filter circuit, and the other end is connected to three switches, namely, switch 20a, switch 20b, and switch 20c. When switches 20a, 20b, and 20c are closed, the connected first filter resonator can be short-circuited. When the number of closed switches is 1, 2, or 3, respectively, the filter circuit order can be reduced by -1, -2, or -3, thereby achieving the effect of reducing the filter circuit order.

[0092] The above-mentioned signal transmission circuit provided in the embodiment of the present application can control whether the first filter resonator participates in filtering by turning the switch on and off, and can dynamically adjust the order of the filter circuit to improve the performance of the signal transmission circuit. In addition, it can also reduce power consumption while ensuring the signal-to-noise ratio.

[0093] Figure 10 This is a structural diagram of a duplexer provided in an embodiment of the present application. Figure 10As shown, the duplexer includes: a transmitting filter 1001 and a receiving filter 1002. The transmitting filter 401 may include the filtering circuit in the signal transmitting circuit 1 as described in any of the above embodiments, and has the same function. For details, please refer to the description in the above embodiments, which will not be repeated here.

[0094] The duplexer provided in the embodiment of the present application uses a filter circuit with a switch in the transmit filter. The on and off of the switch can control whether the first filter resonator participates in the filtering, which can dynamically adjust the order of the filter circuit and optimize the insertion loss of the duplexer. The duplexer can operate in a state where the transmission Tx does not interfere with the reception Rx, thereby increasing the transmission power, improving the performance of the signal transmission circuit, and reducing the transmission power consumption.

[0095] An embodiment of the present application further provides a terminal, comprising the signal transmitting circuit 1 provided in any of the above embodiments.

[0096] In one embodiment, the filter circuit includes at least two filter branches, wherein the at least two filter branches include a first filter branch. For example, the filter circuit may include a first filter branch and a second filter branch.

[0097] Among them, the switch in the first filtering branch is in the off state, the first filtering branch participates in filtering, the signal transmitting circuit is in the first working state, and the signal received by the terminal has a first signal-to-noise ratio.

[0098] When the switch in the first filter branch is in the closed state, the first filter resonator in the first filter branch is short-circuited (the first filter branch does not participate in filtering), the signal transmitting circuit is in the second working state, and the signal received by the terminal has a second signal-to-noise ratio.

[0099] When the signal transmission circuit switches from the first operating state to the second operating state (degraded), if the second signal-to-noise ratio is less than the first signal-to-noise ratio, or the difference between the second signal-to-noise ratio and the demodulation threshold is less than a preset value, the terminal switches the signal transmission circuit from the second operating state to the first operating state by opening the switch in the first filter branch. This preset value can be pre-set as needed, and the specific value is not limited. This scenario indicates that the degraded order has affected the terminal's transmission performance, resulting in a decrease in transmission performance. Therefore, it is necessary to switch from the current state back to the state before the degraded order, that is, switch from the second operating state to the first operating state, to ensure the terminal's transmission performance.

[0100] When the signal transmission circuit switches from the first operating state to the second operating state (reduced order), if the second signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio, or the difference between the second signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the terminal maintains the switch in the first filter branch closed, allowing the signal transmission circuit to continue operating in the second operating state. This preset value can be pre-set as needed, and the specific value is not limited. This scenario demonstrates that the order reduction does not affect the terminal's transmission performance. Therefore, the current state, i.e., the reduced order state, can be maintained without switching operating states. This implementation reduces the order of the filter circuit without degrading the terminal's transmission performance, optimizing the insertion loss of the terminal's duplexer and enabling the duplexer to operate in a state where transmission does not interfere with reception, thereby increasing transmit power and reducing transmit power consumption.

[0101] Figure 11 This is a flow chart of a filtering control method provided in an embodiment of the present application. Figure 11 As shown, the method is applied to the signal transmitting circuit 1 described in any of the above embodiments, or to the duplexer described in the above embodiments, wherein the signal transmitting circuit 1 uses a filtering circuit to filter the transmitting signal, and the method includes the following steps.

[0102] S1102: Close the switch in the filter circuit to reduce the order of the filter circuit.

[0103] Specifically, a switch in the filter circuit may be closed to reduce the order of the filter circuit by one.

[0104] S1104: Calculate the signal-to-noise ratio of the received signal after the filter circuit is downgraded.

[0105] S1106: If the signal-to-noise ratio of the received signal after the filter circuit is downgraded meets the preset conditions, the switch is kept closed to maintain the downgraded state of the filter circuit; if the signal-to-noise ratio of the received signal after the filter circuit is downgraded does not meet the preset conditions, the switch is opened to return the filter circuit to the state before the downgrade.

[0106] The above method can be executed cyclically. As long as the signal-to-noise ratio of the filter circuit after order reduction meets the preset conditions, the order reduction can be continued until the signal-to-noise ratio does not meet the preset conditions, and then the state before the last order reduction can be rolled back.

[0107] In the embodiment of the present application, the signal-to-noise ratio of the received signal after the filter circuit downgrades the order, which meets the preset conditions, includes but is not limited to: the signal-to-noise ratio of the received signal after the filter circuit downgrades the order is greater than or equal to the signal-to-noise ratio of the received signal before the downgrade, or the difference between the signal-to-noise ratio of the received signal after the filter circuit downgrades the order and the demodulation threshold is greater than or equal to a preset target difference, and the specific conditions are not limited.

[0108] In one implementation, step S1106 may include: If the signal-to-noise ratio of the received signal after the filter circuit is downgraded is greater than or equal to the signal-to-noise ratio of the received signal before the downgrade, then keeping the switch closed to maintain the downgraded state of the filter circuit; or, If the difference between the signal-to-noise ratio of the received signal and the demodulation threshold after the filter circuit is downgraded is greater than or equal to the preset target difference, the switch is kept closed to maintain the downgraded state of the filter circuit.

[0109] The signal-to-noise ratio of the received signal before downscaling can be calculated before downscaling. Both the demodulation threshold and the target difference can be pre-set as needed, with no specific value restrictions. The target difference can be used to calibrate the desired throughput.

[0110] Figure 12 This is a flow chart of another filtering control method provided in an embodiment of the present application. Figure 12 As shown, the method is applied to a duplexer, wherein the transmit filter includes the aforementioned filter circuit and is used to filter the transmit signal. The method includes the following process: in a communication connection state, calculating the signal-to-noise ratio (SNR0) of the received signal, and reducing the order of the transmit filter by 1 by closing a switch; calculating the signal-to-noise ratio (SNR1) of the received signal after the order reduction; determining whether SNR1 is greater than SNR1; if so, returning to the step of calculating SNR0 to continue order reduction; otherwise, opening the switch to increase the order of the transmit filter by 1; if communication is not interrupted, the above process can be repeated; if communication is interrupted, the process ends.

[0111] This method of dynamically adjusting the order of the filter circuit by comparing the signal-to-noise ratio of the received signal before and after order reduction can optimize the insertion loss of the duplexer, increase the transmission power, and reduce the transmission power consumption.

[0112] Figure 13 This is a flow chart of another filtering control method provided in an embodiment of the present application. Figure 13 As shown, the method is applied to a duplexer, wherein the transmit filter includes the aforementioned filter circuit and is used to filter the transmit signal. The method includes the following process: presetting a target difference value T, and in a communication connection state, closing a switch to reduce the transmit filter order by 1; calculating the difference B between the signal-to-noise ratio of the received signal after order reduction and the demodulation threshold; determining whether B is greater than T; if so, returning to the order reduction step; otherwise, opening the switch to increase the transmit filter order by 1; and repeating the above process if communication is not interrupted. If communication is interrupted, the process ends.

[0113] This method of dynamically adjusting the order of the filter circuit by comparing the difference between the received signal's signal-to-noise ratio and the demodulation threshold with the target difference can optimize the duplexer's insertion loss, increase the transmit power, and reduce transmit power consumption.

[0114] Figure 14This is a schematic diagram of the structure of a signal receiving circuit provided in an embodiment of the present application. Figure 14 As shown, an embodiment of the present application further provides a signal receiving circuit for a terminal, comprising: an antenna 200 , a signal receiving end 300 , a filter 400 and a low noise amplifier 500 .

[0115] One end of the low noise amplifier 500 is connected to the antenna 200 , and the other end of the low noise amplifier 500 is connected to the filter 400 . One end of the filter 400 is connected to the low noise amplifier 500 , and the other end of the filter 400 is connected to the signal receiving end 300 .

[0116] In the examples of this application, see Figure 4 , the signal receiving circuit may further include a switch module 100 .

[0117] The low noise amplifier 500 is respectively connected to the antenna 200 , the signal receiving end 300 and the filter 400 through the switch module 100 .

[0118] The filter 400 is respectively connected to the antenna 200 , the signal receiving end 300 and the low noise amplifier 500 through the switch module 100 .

[0119] When the switch module 100 is controlled to put the signal receiving circuit 2 in the third working state, the signal received by the antenna 200 is first amplified by the low noise amplifier 500 , and then filtered by the filter 400 before being input into the signal receiving end 300 .

[0120] When the switch module 100 is controlled to put the signal receiving circuit 2 in the fourth working state, the signal received by the antenna 200 is first filtered by the filter 400 , then amplified by the low noise amplifier 500 and input into the signal receiving end 300 .

[0121] In the embodiment of the present application, the switch module 100 includes a first group of switches and a second group of switches.

[0122] When the first set of switches is turned on and the second set of switches is turned off, the signal receiving circuit 2 is in the third working state. When the first set of switches is turned off and the second set of switches is turned on, the signal receiving circuit 2 is in the fourth working state.

[0123] In the examples of this application, see Figure 5 The switch module 100 includes a first switch loop 600 and a second switch loop 700 .

[0124] The first switch loop 600 includes a first transistor 61 , a second transistor 62 , a third transistor 63 and a fourth transistor 64 connected in sequence, and the fourth transistor 64 is connected to the first transistor 61 .

[0125] The second switch loop 700 includes a fifth transistor 75 , a sixth transistor 76 , a seventh transistor 77 and an eighth transistor 78 connected in sequence, and the fifth transistor 75 is connected to the eighth transistor 78 .

[0126] When the signal receiving circuit 2 is in the third working state, the signal received by the antenna 200 passes through the fourth transistor 64 , the low noise amplifier 500 , the fifth transistor 75 , the second transistor 62 , the filter 400 and the seventh transistor 77 in sequence and is input to the signal receiving end 300 .

[0127] When the signal receiving circuit 2 is in the fourth working state, the signal received by the antenna 200 passes through the third transistor 63 , the filter 400 , the sixth transistor 76 , the first transistor 61 , the low noise amplifier 500 and the eighth transistor 78 in sequence and is then input into the signal receiving end 300 .

[0128] In one embodiment, the antenna 200 is connected to the third transistor 63 and the fourth transistor 64 .

[0129] The signal receiving terminal 300 is connected to the seventh transistor 77 and the eighth transistor 78 .

[0130] One end of the low noise amplifier 500 is connected to the first transistor 61 and the fourth transistor 64 , and the other end of the low noise amplifier 500 is connected to the fifth transistor 75 and the eighth transistor 78 .

[0131] One end of the filter 400 is connected to the second transistor 62 and the third transistor 63 , and the other end of the filter 400 is connected to the sixth transistor 76 and the seventh transistor 77 .

[0132] The fifth transistor 75 and the sixth transistor 76 are connected to the first transistor 61 and the second transistor 62 , respectively.

[0133] The fourth transistor 64, the fifth transistor 75, the second transistor 62 and the seventh transistor 77 form a first switch group, while the third transistor 63, the sixth transistor 76, the first transistor 61 and the eighth transistor 78 form a second switch group.

[0134] In the embodiment of the present application, the transistor (Field Effect Transistor, FET) can be made of semiconductor materials Si or GaAs, without specific limitation. Adding FET to FEM does not add new processes and procedures, and has strong feasibility.

[0135] In embodiments of the present application, a General Radio Frequency Controller (GRFC) signal can be used to control the on / off state of transistors. When a GRFC signal is connected to a transistor, the connected transistor can be turned on by setting the GRFC signal to a high level, and turned off by setting the GRFC signal to a low level. By applying the GRFC signal to transistors in the first switching loop 600 and the second switching loop 700, the on / off state of the transistors can be controlled by setting the control terminals of the transistors to a high or low level, thereby achieving either amplification followed by filtering or filtering followed by amplification.

[0136] In the embodiment of the present application, two GRFC signals may be used to control transistors in the first switching loop 600 and the second switching loop 700 .

[0137] The fourth transistor 64 , the fifth transistor 75 , the second transistor 62 and the seventh transistor 77 are all connected to the first GRFC signal.

[0138] The third transistor 63 , the sixth transistor 76 , the first transistor 61 and the eighth transistor 78 are all connected to the second GRFC signal.

[0139] When the first GRFC signal is at a high level, the fourth transistor 64, the fifth transistor 75, the second transistor 62 and the seventh transistor 77 are turned on, and when the second GRFC signal is at a low level, the third transistor 63, the sixth transistor 76, the first transistor 61 and the eighth transistor 78 are turned off, and the signal receiving circuit 2 is in the third working state (amplification before filtering).

[0140] When the first GRFC signal is at a low level, the fourth transistor 64, the fifth transistor 75, the second transistor 62 and the seventh transistor 77 are turned off, and when the second GRFC signal is at a high level, the third transistor 63, the sixth transistor 76, the first transistor 61 and the eighth transistor 78 are turned on, and the signal receiving circuit 2 is in the fourth working state (filtering first and then amplifying).

[0141] In the embodiment of the present application, the above-mentioned method of sampling two GRFC signals to control whether the signal receiving circuit 2 is in the third working state or the fourth working state does not require adding a new control signal, and can be implemented by multiplexing the existing GRFC signals in the system. It has low cost characteristics, simple operation, and is easy to implement.

[0142] The above-mentioned signal receiving circuit provided in the embodiment of the present application can eliminate the influence of filtering on the noise coefficient, reduce the noise coefficient, and improve the signal-to-noise ratio of the received signal, thereby improving the performance of the signal receiving circuit by controlling the signal received by the antenna to be first amplified and then filtered before being output to the signal receiving end.

[0143] An embodiment of the present application further provides a terminal, comprising the signal receiving circuit provided in the above embodiment.

[0144] In one embodiment, see Figure 4 The signal receiving circuit of the terminal further includes a switch module 100, and the signal received by the terminal has a third signal-to-noise ratio.

[0145] The low noise amplifier 500 is respectively connected to the antenna 200 , the signal receiving end 300 and the filter 400 through the switch module 100 .

[0146] The filter 400 is respectively connected to the antenna 200 , the signal receiving end 300 and the low noise amplifier 500 through the switch module 100 .

[0147] When the third signal-to-noise ratio (SNR) of the signal receiving circuit 2 is less than a preset value, or when the difference between the third SNR and the demodulation threshold is less than a preset value, the switch module 100 controls the signal receiving circuit 2 to enter the third operating state. The signal received by the antenna 200 is first amplified by the low-noise amplifier 500, then filtered by the filter 400, and then input to the signal receiving end 300. This approach can be applied to scenarios where communication indicators are below a preset threshold, such as weak signal conditions in corridors or parking lots. It can eliminate the impact of filtering on the noise figure, reduce the noise figure, increase receiving sensitivity, and enhance receiving performance.

[0148] When the third signal-to-noise ratio is greater than or equal to a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the signal receiving circuit 2 controls the switch module 100 to place the signal receiving circuit 2 in a fourth operating state. The signal received by the antenna 200 is first filtered by the filter 400, then amplified by the low-noise amplifier 500, and then input to the signal receiving end 300. This approach can be applied in scenarios where communication indicators are not lower than a preset threshold, such as scenarios where the signal strength is moderate or strong, and can ensure normal communication.

[0149] The above-mentioned terminal provided in the embodiment of the present application controls the signal received by the antenna through the signal receiving circuit to first amplify and then filter the signal before outputting it to the signal receiving end. This can eliminate the influence of filtering on the noise coefficient, reduce the noise coefficient, and improve the signal-to-noise ratio of the received signal, thereby improving the receiving performance of the terminal.

[0150] Figure 15 This is a flow chart of a control method for a signal receiving circuit provided in an embodiment of the present application. Figure 15 As shown, the method is applied to the signal receiving circuit described in any of the above embodiments, and the method includes the following steps.

[0151] S1502: Acquire a signal-to-noise ratio of a signal received by a signal receiving circuit.

[0152] S1504: Compare the signal-to-noise ratio with a preset value, or compare the difference between the signal-to-noise ratio and the demodulation threshold with a preset value.

[0153] S1506: If the signal-to-noise ratio is less than the preset value, or the difference between the signal-to-noise ratio and the demodulation threshold is less than the preset value, the signal receiving circuit is controlled to be in the third working state.

[0154] The third working state refers to the signal received by the signal receiving circuit from the antenna being amplified by the LNA and then filtered by the filter before being output to the signal receiving end (of the RF transceiver).

[0155] In the embodiment of the present application, the above step S1504 may further include: If the signal-to-noise ratio is greater than or equal to the preset value, or the difference between the signal-to-noise ratio and the demodulation threshold is greater than or equal to the preset value, the signal receiving circuit is controlled to be in the fourth working state.

[0156] The fourth working state refers to the signal received by the signal receiving circuit from the antenna being filtered by the filter, amplified by the LNA, and then output to the signal receiving end (of the RF transceiver).

[0157] The above-mentioned preset values ​​can be pre-set as needed, and the specific values ​​are not limited.

[0158] In the embodiment of the present application, the above-mentioned signal-to-noise ratio can also be replaced by other communication indicators, such as reference signal received power (RSRP), signal to interference plus noise ratio (SINR), sensitivity or throughput, etc. The judgment and processing procedures are the same and will not be repeated here.

[0159] The control method for the signal receiving circuit provided in an embodiment of the present application obtains the signal-to-noise ratio of the signal received by the signal receiving circuit and compares the signal-to-noise ratio with a preset value, or compares the difference between the signal-to-noise ratio and the demodulation threshold with a preset value. If the signal-to-noise ratio is less than the preset value, or the difference between the signal-to-noise ratio and the demodulation threshold is less than the preset value, the signal receiving circuit is controlled to be in a third operating state. This allows the signal received by the signal receiving circuit from the antenna to be amplified by the LNA and then filtered by the filter before being output to the signal receiving end. This can eliminate the impact of filtering on the noise figure and improve reception performance.

[0160] Figure 16 This is a flow chart of a wireless communication method provided in an embodiment of the present application. Figure 16 The wireless communication method can be applied to the terminal provided in any of the above embodiments, and includes the following steps: S1602: The terminal obtains a terminal signal-to-noise ratio of a received signal.

[0161] S1604: The terminal obtains the base station signal-to-noise ratio of the received signal fed back by the base station.

[0162] S1606: When the terminal signal-to-noise ratio is greater than the base station signal-to-noise ratio, or when the difference between the terminal signal-to-noise ratio and the demodulation threshold is greater than the difference between the base station signal-to-noise ratio and the demodulation threshold, tune the antenna so that the resonant frequency of the antenna is closer to the transmission frequency of the signal transmission circuit.

[0163] S1608: When the terminal signal-to-noise ratio is less than the base station signal-to-noise ratio, or when the difference between the terminal signal-to-noise ratio and the demodulation threshold is less than the difference between the base station signal-to-noise ratio and the demodulation threshold, tune the antenna so that the resonant frequency of the antenna is closer to the receiving frequency of the signal receiving circuit.

[0164] The difference between the base station signal-to-noise ratio and the demodulation threshold can be calculated by the base station and sent to the terminal. This is not described in detail here. The demodulation threshold of the terminal and the demodulation threshold of the base station can be pre-set as needed, and the specific values ​​are not limited.

[0165] A tuner or a variable capacitor may be used to tune the antenna to achieve a change in the resonant frequency, moving toward the transmitting frequency point of the signal transmitting circuit or the receiving frequency point of the signal receiving circuit, without specific limitation.

[0166] Tuning the antenna to bring its resonant frequency closer to the transmit frequency of the signal transmission circuit improves transmission efficiency, facilitating signal transmission for the terminal. Tuning the antenna to bring its resonant frequency closer to the receive frequency of the signal reception circuit improves reception efficiency, facilitating signal reception for the terminal. This dynamic adjustment balances the terminal's transmit and receive performance, helping the terminal find the optimal balance for signal transmission and reception, thereby improving communication efficiency.

[0167] Figure 17 This is a flow chart of another wireless communication method provided in an embodiment of the present application. Figure 17As shown, the method includes the following process: in the communication connection state, the mobile phone calculates the difference A0 between the signal-to-noise ratio of the received signal and the demodulation threshold, and obtains the difference A1 between the signal-to-noise ratio of the received signal fed back by the base station and the demodulation threshold; determines whether A0 is greater than A1, and if so, tunes the antenna so that the antenna's resonant frequency is closer to the transmission frequency point (Tx frequency point) of the signal transmission circuit; otherwise, tunes the antenna so that the antenna's resonant frequency is closer to the reception frequency point (Rx frequency point) of the signal reception circuit; if the communication is not interrupted, the above process can be repeated; if the communication is interrupted, the process ends.

[0168] The control effect of the above resonant frequency control method is described in detail below using Table 1 as an example.

[0169] Table 1

[0170] Before tuning, the terminal's received signal has a signal-to-noise ratio (SNR) of 30dB, and the demodulation threshold is typically -1dB. The received signal quality is excellent, with a transmit (Tx) efficiency of -7dB and a receive (Rx) efficiency of -7dB. When the SNR and demodulation thresholds meet these requirements, the antenna is tuned to shift the resonant frequency toward the Tx frequency. After tuning, the Tx efficiency increases by 3dB to -4dB. The Rx efficiency decreases by 5dB to -12dB. At this point, the terminal's received signal has a SNR of 25dB, which, while slightly lower, remains excellent. For example, in frequency band N1, the Tx power consumption at 23dBm is 500mA, while at 20dBm it is 250mA, halving the original power consumption, significantly reducing terminal power consumption.

[0171] The wireless communication method provided in the embodiment of the present application tunes the antenna so that the antenna's resonant frequency is closer to the transmit frequency of the signal transmitting circuit or closer to the receive frequency of the signal receiving circuit based on the terminal signal-to-noise ratio and the base station signal-to-noise ratio. This can dynamically adjust the terminal's transmission efficiency and reception efficiency, improve the terminal's transceiver performance, help achieve optimal interaction performance between the terminal and the base station, and reduce the terminal's power consumption.

[0172] See also Figure 18 , is a schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 18 As shown, an embodiment of the present application also provides an electronic device 1800, including a processor 1801 and a memory 1802, wherein the memory 1802 stores a program or instruction that can be run on the processor 1801, and when the program or instruction is executed by the processor 1801, the various steps of the above-mentioned method embodiments are implemented and the same technical effect can be achieved. To avoid repetition, they are not described here.

[0173] It should be noted that the electronic devices in the embodiments of the present application include mobile electronic devices and non-mobile electronic devices.

[0174] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiments are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0175] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0176] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiments and achieve the same technical effects. To avoid repetition, they will not be repeated here.

[0177] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0178] An embodiment of the present application provides a computer program product, which is stored in a storage medium. The program product is executed by at least one processor to implement the various processes of the above-mentioned method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0179] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0180] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of this application.

[0181] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A terminal, characterized in that: It includes a signal transmitting circuit and a signal receiving circuit, wherein at least one of the signal transmitting circuit and the signal receiving circuit includes a switch module; When the signal transmitting circuit includes the switch module, controlling the switch module to switch the signal transmitting circuit between a first working state and a second working state, so as to adjust a signal-to-noise ratio of a signal received by the terminal; When the signal receiving circuit includes the switch module, the switch module is controlled to switch the signal receiving circuit between the third working state and the fourth working state, so as to adjust the signal-to-noise ratio of the signal received by the terminal.

2. The terminal according to claim 1, wherein The signal transmission circuit includes a filter circuit, the filter circuit includes at least one filter branch, and the filter branch includes: a first filter resonator connected between the input terminal and the output terminal of the filter circuit, wherein the first filter resonator is electrically connected to the ground terminal; The switch module includes switches connected to the input end of the filter circuit and the first filter resonator respectively; When the switch is in the open state, the first filter resonator participates in filtering, and the signal transmitting circuit is in the first working state; when the switch is in the closed state, the first filter resonator is short-circuited, and the signal transmitting circuit is in the second working state; The signal transmitting circuit adjusts the signal-to-noise ratio of the signal received by the terminal by controlling the on-off state of the switch.

3. The terminal according to claim 2, characterized in that The filtering branch further includes: a second filter resonator, one end of the second filter resonator being connected to the first filter resonator and the output end of the filter circuit respectively through a first node, and the other end of the second filter resonator being electrically connected to a ground end; The switch is connected to the first filter resonator via the first node; When the switch is in the off state, both the first filter resonator and the second filter resonator participate in filtering, and the signal transmitting circuit is in the first working state. The terminal according to claim 3, wherein: The filter circuit includes multiple filter branches, and the first filter resonators in the multiple filter branches are connected in series between the input end and the output end of the filter circuit. The first node between two adjacent first filter resonators is grounded through the second filter resonator, and the first node between two adjacent first filter resonators is connected to the input end of the filter circuit through the switch. The terminal according to claim 2, wherein: The filtering circuit includes at least two filtering branches, and the at least two filtering branches include a first filtering branch; The switch in the first filtering branch is in an off state, the first filtering branch participates in filtering, the signal transmitting circuit is in the first working state, and the signal received by the terminal has a first signal-to-noise ratio; The switch in the first filter branch is in a closed state, the first filter resonator in the first filter branch is short-circuited, the signal transmitting circuit is in the second working state, and the signal received by the terminal has a second signal-to-noise ratio; When the signal transmission circuit switches from the first operating state to the second operating state, if the second signal-to-noise ratio is less than the first signal-to-noise ratio, or if the difference between the second signal-to-noise ratio and a demodulation threshold is less than a preset value, the terminal switches the signal transmission circuit from the second operating state to the first operating state by disconnecting the switch in the first filtering branch; When the signal transmission circuit switches from the first operating state to the second operating state, if the second signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio, or if the difference between the second signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the terminal maintains the closed state of the switch in the first filtering branch, so that the signal transmission circuit continues to operate in the second operating state. The terminal according to claim 1 , wherein: The signal receiving circuit includes: antenna; signal receiving end; The switch module is connected between the antenna and the signal receiving end; a filter connected between the antenna and the signal receiving end through the switch module; a low noise amplifier, connected between the antenna and the signal receiving end through the switch module; When the switch module is controlled to put the signal receiving circuit in the third working state, the signal received by the antenna is first amplified by the low-noise amplifier, and then filtered by the filter before being input into the signal receiving end; When the switch module is controlled to put the signal receiving circuit in the fourth working state, the signal received by the antenna is first filtered by the filter, then amplified by the low noise amplifier, and then input into the signal receiving end.

7. The terminal according to claim 6, characterized in that The switch module includes a first group of switches and a second group of switches; When the first set of switches is turned on and the second set of switches is turned off, the signal receiving circuit is in the third working state; When the first set of switches is turned off and the second set of switches is turned on, the signal receiving circuit is in the fourth working state. The terminal according to claim 7 , wherein: The switch module includes a first switch loop and a second switch loop; The first switch loop includes a first transistor, a second transistor, a third transistor, and a fourth transistor connected in sequence, and the fourth transistor is connected to the first transistor; The second switch loop includes a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor connected in sequence, and the fifth transistor is connected to the eighth transistor; When the signal receiving circuit is in the third working state, the signal received by the antenna passes through the fourth transistor, the low-noise amplifier, the fifth transistor, the second transistor, the filter, and the seventh transistor in sequence before being input into the signal receiving end; When the signal receiving circuit is in the fourth working state, the signal received by the antenna passes through the third transistor, the filter, the sixth transistor, the first transistor, the low-noise amplifier and the eighth transistor in sequence and is then input into the signal receiving end.

9. The terminal according to claim 8, characterized in that The antenna is connected to the third transistor and the fourth transistor; The signal receiving end is connected to the seventh transistor and the eighth transistor; One end of the low noise amplifier is connected to the first transistor and the fourth transistor, and the other end of the low noise amplifier is connected to the fifth transistor and the eighth transistor; One end of the filter is connected to the second transistor and the third transistor, and the other end of the filter is connected to the sixth transistor and the seventh transistor; The fifth transistor and the sixth transistor are connected to the first transistor and the second transistor respectively; The fourth transistor, the fifth transistor, the second transistor and the seventh transistor constitute the first group of switches; the third transistor, the sixth transistor, the first transistor and the eighth transistor constitute the second group of switches.

10. The terminal according to claim 6, characterized in that The signal received by the terminal has a third signal-to-noise ratio; The signal receiving circuit controls the switch module to put the signal receiving circuit into the third working state when the third signal-to-noise ratio is less than a preset value or when the difference between the third signal-to-noise ratio and the demodulation threshold is less than a preset value; The signal receiving circuit controls the switch module to put the signal receiving circuit into the fourth working state when the third signal-to-noise ratio is greater than or equal to a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value.

11. A signal transmitting circuit for a terminal, characterized in that: The filter circuit includes at least one filter branch, and the filter branch includes: a first filter resonator connected between the input terminal and the output terminal of the filter circuit, wherein the first filter resonator is electrically connected to the ground terminal; a switch, wherein a first end of the switch is electrically connected to the input end of the filter circuit, and a second end of the switch is connected to the first filter resonator; When the switch is in the open state, the first filter resonator participates in filtering, and the signal transmitting circuit is in the first working state; when the switch is in the closed state, the first filter resonator is short-circuited, and the signal transmitting circuit is in the second working state.

12. The signal transmitting circuit according to claim 11, wherein: The filtering branch further includes: a second filter resonator, one end of the second filter resonator being connected to the first filter resonator and the output end of the filter circuit respectively through a first node, and the other end of the second filter resonator being electrically connected to a ground end; The switch is connected to the first filter resonator via the first node; When the switch is in the off state, both the first filter resonator and the second filter resonator participate in filtering, and the signal transmitting circuit is in the first working state.

13. The signal transmitting circuit according to claim 11, wherein: The filter circuit includes multiple filter branches, and the first filter resonators in the multiple filter branches are connected in series between the input end and the output end of the filter circuit. The first nodes between two adjacent first filter resonators are grounded through the second filter resonator, and the first nodes between two adjacent first filter resonators are connected to the input end of the filter circuit through the switch.

14. The signal transmitting circuit according to claim 11, wherein: The filtering circuit includes at least two filtering branches, and the at least two filtering branches include a first filtering branch; When the switch in the first filtering branch is in the off state, the first filtering branch participates in filtering, and the signal transmitting circuit is in the first working state; The switch in the first filter branch is in a closed state, the first filter resonator in the first filter branch is short-circuited, and the signal transmitting circuit is in the second working state.

15. The signal transmitting circuit according to any one of claims 11 to 14, characterized in that: The filtering circuit further includes: an equipotential body connected to the input end of the filter circuit; The first end of the switch is connected to the equipotential body, and the first end of the switch is electrically connected to the input end of the filter circuit through the equipotential body.

16. A terminal, characterized in that: The method comprises the signal transmitting circuit according to any one of claims 11 to 15. The terminal according to claim 16 , wherein: The filtering circuit includes at least two filtering branches, and the at least two filtering branches include a first filtering branch; The switch in the first filtering branch is in an off state, the first filtering branch participates in filtering, the signal transmitting circuit is in the first working state, and the signal received by the terminal has a first signal-to-noise ratio; The switch in the first filter branch is in a closed state, the first filter resonator in the first filter branch is short-circuited, the signal transmitting circuit is in the second working state, and the signal received by the terminal has a second signal-to-noise ratio; When the signal transmission circuit switches from the first operating state to the second operating state, if the second signal-to-noise ratio is less than the first signal-to-noise ratio, or if the difference between the second signal-to-noise ratio and a demodulation threshold is less than a preset value, the terminal switches the signal transmission circuit from the second operating state to the first operating state by disconnecting the switch in the first filtering branch; When the signal transmission circuit switches from the first operating state to the second operating state, if the second signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio, or if the difference between the second signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the terminal maintains the closed state of the switch in the first filtering branch, so that the signal transmission circuit continues to operate in the second operating state.

18. A signal receiving circuit for a terminal, characterized in that: include: Antenna, signal receiver, filter and low noise amplifier; One end of the low noise amplifier is connected to the antenna, and the other end of the low noise amplifier is connected to the filter; One end of the filter is connected to the low noise amplifier, and the other end of the filter is connected to the signal receiving end.

19. The signal receiving circuit according to claim 18, wherein: Also included is a switch module; The low noise amplifier is respectively connected to the antenna, the signal receiving end and the filter through the switch module; The filter is respectively connected to the antenna, the signal receiving end and the low noise amplifier through the switch module; When the switch module is controlled to put the signal receiving circuit in the third working state, the signal received by the antenna is first amplified by the low-noise amplifier, and then filtered by the filter before being input into the signal receiving end; When the switch module is controlled to put the signal receiving circuit in the fourth working state, the signal received by the antenna is first filtered by the filter, then amplified by the low noise amplifier, and then input into the signal receiving end.

20. The signal receiving circuit according to claim 19, wherein: The switch module includes a first group of switches and a second group of switches; When the first set of switches is turned on and the second set of switches is turned off, the signal receiving circuit is in the third working state; When the first set of switches is turned off and the second set of switches is turned on, the signal receiving circuit is in the fourth working state.

21. The signal receiving circuit according to claim 20, wherein: The switch module includes a first switch loop and a second switch loop; The first switch loop includes a first transistor, a second transistor, a third transistor, and a fourth transistor connected in sequence, and the fourth transistor is connected to the first transistor; The second switch loop includes a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor connected in sequence, and the fifth transistor is connected to the eighth transistor; When the signal receiving circuit is in the third working state, the signal received by the antenna passes through the fourth transistor, the low-noise amplifier, the fifth transistor, the second transistor, the filter, and the seventh transistor in sequence before being input into the signal receiving end; When the signal receiving circuit is in the fourth working state, the signal received by the antenna passes through the third transistor, the filter, the sixth transistor, the first transistor, the low-noise amplifier and the eighth transistor in sequence and is then input into the signal receiving end.

22. The signal receiving circuit according to claim 21, wherein: The antenna is connected to the third transistor and the fourth transistor; The signal receiving end is connected to the seventh transistor and the eighth transistor; One end of the low noise amplifier is connected to the first transistor and the fourth transistor, and the other end of the low noise amplifier is connected to the fifth transistor and the eighth transistor; One end of the filter is connected to the second transistor and the third transistor, and the other end of the filter is connected to the sixth transistor and the seventh transistor; The fifth transistor and the sixth transistor are connected to the first transistor and the second transistor respectively; The fourth transistor, the fifth transistor, the second transistor and the seventh transistor constitute the first group of switches; the third transistor, the sixth transistor, the first transistor and the eighth transistor constitute the second group of switches.

23. The signal receiving circuit according to claim 21, wherein: The fourth transistor, the fifth transistor, the second transistor and the seventh transistor are all connected to a first general radio frequency controller GRFC signal; The third transistor, the sixth transistor, the first transistor and the eighth transistor are all connected to a second GRFC signal; When the first GRFC signal is at a high level, the fourth transistor, the fifth transistor, the second transistor, and the seventh transistor are turned on, and when the second GRFC signal is at a low level, the third transistor, the sixth transistor, the first transistor, and the eighth transistor are turned off, and the signal receiving circuit is in the third working state; When the first GRFC signal is at a low level, the fourth transistor, the fifth transistor, the second transistor, and the seventh transistor are disconnected, and when the second GRFC signal is at a high level, the third transistor, the sixth transistor, the first transistor, and the eighth transistor are turned on, and the signal receiving circuit is in the fourth working state.

24. A terminal, characterized in that: The method comprises the signal receiving circuit according to any one of claims 18 to 23.

25. The terminal according to claim 24, characterized in that The signal receiving circuit further includes a switch module, and the signal received by the terminal has a third signal-to-noise ratio; The low noise amplifier is respectively connected to the antenna, the signal receiving end and the filter through the switch module; The filter is respectively connected to the antenna, the signal receiving end and the low noise amplifier through the switch module; When the third signal-to-noise ratio is less than a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is less than a preset value, the signal receiving circuit controls the switch module to put the signal receiving circuit into a third working state, whereby the signal received by the antenna is first amplified by the low-noise amplifier, then filtered by the filter, and then input into the signal receiving end; When the third signal-to-noise ratio is greater than or equal to a preset value, or when the difference between the third signal-to-noise ratio and the demodulation threshold is greater than or equal to a preset value, the signal receiving circuit controls the switch module to place the signal receiving circuit in a fourth working state, whereby a signal received by the antenna is first filtered by the filter, then amplified by the low-noise amplifier, and then input into the signal receiving end.

26. A wireless communication method, characterized in that: Applied to the terminal according to claim 1, 16 or 24, the wireless communication method includes: The terminal obtains a terminal signal-to-noise ratio of a received signal; The terminal obtains a base station signal-to-noise ratio of a received signal fed back by the base station; When the signal-to-noise ratio of the terminal is greater than the signal-to-noise ratio of the base station, or when the difference between the signal-to-noise ratio of the terminal and the demodulation threshold is greater than the difference between the signal-to-noise ratio of the base station and the demodulation threshold, tuning the antenna so that the resonant frequency of the antenna is closer to the transmission frequency point of the signal transmitting circuit; When the signal-to-noise ratio of the terminal is less than the signal-to-noise ratio of the base station, or when the difference between the signal-to-noise ratio of the terminal and the demodulation threshold is less than the difference between the signal-to-noise ratio of the base station and the demodulation threshold, the antenna is tuned so that the resonant frequency of the antenna is closer to the receiving frequency of the signal receiving circuit.

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