Signal sending method and device, storage medium and electronic device

Abstract

The embodiment of the invention provides a signal sending method and device, a storage medium and an electronic device. The method comprises: acquiring a first radio frequency signal from a transmitting end of a first device, the first radio frequency signal being a signal obtained after a transmitting link of the first device performs transmission pre-processing on a to-be-transmitted first intermediate frequency signal, the distortion component of the first radio frequency signal has passive intermodulation distortion generated by a passive device in the sending link; pre-distortion processing is carried out on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, the second intermediate frequency signal is a next intermediate frequency signal to be sent after the first intermediate frequency signal, and the pre-distortion processing comprises passive intermodulation pre-distortion processing; performing transmission pre-processing on the target intermediate frequency signal through a transmission link of the first device to obtain a second radio frequency signal; and sending the second radio frequency signal through the sending end of the first device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and in particular, to a signal sending method and device, a storage medium, and an electronic device. Background Art

[0002] In current wireless products, especially microwave products, the passive intermodulation (PIM) products generated by passive components are basically designed by manufacturers according to system requirements. The design schemes are relatively complicated, and the passive intermodulation caused by connection surfaces, screws, etc. cannot be avoided in the design. When problems occur, the passive components are returned to the original factory for repair or even redesigned.

[0003] In addition, although there are currently detection devices for passive intermodulation, the devices can only determine the passive intermodulation fault point and cannot be used for system self-healing.

[0004] Currently, the passive intermodulation problem that has occurred but cannot be solved is improved by increasing link attenuation or reducing the power of the transmitting front end. That is, the impact of passive intermodulation on the performance of the receiver (Receiver, referred to as RX) is improved by sacrificing system performance.

[0005] In the related art, there is no effective solution to the problem that passive intermodulation generated when signals pass through passive devices cannot be eliminated. Summary of the invention

[0006] The embodiments of the present invention provide a signal transmission method and device, a storage medium and an electronic device, so as to at least solve the problem in the related art that passive intermodulation generated when a signal passes through a passive device cannot be eliminated.

[0007] According to one embodiment of the present invention, a signal sending method is provided, comprising: acquiring a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after a transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be sent, and a distortion component of the first radio frequency signal includes passive intermodulation distortion generated by passive components in the transmitting link; performing pre-distortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is the next intermediate frequency signal to be sent after the first intermediate frequency signal, and the pre-distortion processing includes pre-distortion processing of passive intermodulation; performing pre-transmission processing on the target intermediate frequency signal through the transmitting link of the first device to obtain a second radio frequency signal; and sending the second radio frequency signal through the transmitting end of the first device.

[0008] In an exemplary embodiment, when there are active devices in the transmission link, the distortion component of the first RF signal also includes active intermodulation distortion generated by the active devices in the transmission link, and the predistortion processing also includes predistortion processing of active intermodulation.

[0009] In an exemplary embodiment, pre-distortion processing is performed on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, including: coupling the first radio frequency signal to a receiving end of the first device; receiving and processing the first radio frequency signal through a receiving link of the first device to obtain a third intermediate frequency signal, wherein the distortion component of the third intermediate frequency signal includes the distortion component of the first radio frequency signal; and pre-distortion processing is performed on the second intermediate frequency signal according to the third intermediate frequency signal to obtain a target intermediate frequency signal.

[0010] In an exemplary embodiment, coupling the first radio frequency signal to a receiving end of the first device includes: coupling the first radio frequency signal from a transmitting end of the duplexer to a receiving end of the duplexer through a loopback channel of the duplexer; wherein the transmitting end of the first device includes the receiving end of the duplexer, and the receiving end of the first device includes the receiving end of the duplexer.

[0011] In an exemplary embodiment, the first RF signal is received and processed through the receiving link of the first device to obtain a third intermediate frequency signal, including: processing the first RF signal through a low noise amplifier LNA in the receiving link to obtain a first gain RF signal; performing frequency conversion processing on the first gain RF signal through a down converter in the receiving link to obtain a first signal, wherein the transmitting link has an up converter, and the up converter and the down converter share a local oscillator; filtering the first signal through a first filter to obtain the third intermediate frequency signal, wherein the center frequency of the first filter is the frequency of the first signal.

[0012] In an exemplary embodiment, before or after receiving and processing the first RF signal through the receiving link of the first device, the method further includes: when the receiving end of the first device obtains the third RF signal sent by the second device, processing the third RF signal through the LNA in the receiving link to obtain a second gain RF signal; performing frequency conversion processing on the second gain RF signal through the down converter to obtain a second signal, wherein the frequency of the second signal is different from that of the first signal; filtering the second signal through a second filter to obtain a fourth intermediate frequency signal, wherein the center frequency of the second filter is the frequency of the second signal; and sending the fourth intermediate frequency signal to the intermediate frequency signal receiving module of the first device.

[0013] In an exemplary embodiment, the second intermediate frequency signal is predistorted according to the third intermediate frequency signal to obtain a target intermediate frequency signal, including: amplifying the distortion component in the third intermediate frequency signal through a linear amplifier to obtain a fourth intermediate frequency signal; and using the fourth intermediate frequency signal to predistort the second intermediate frequency signal through a predistortion processing module to obtain a target intermediate frequency signal.

[0014] In an exemplary embodiment, the first intermediate frequency signal is predistorted using the fourth intermediate frequency signal through a predistortion processing module, including: when the distortion spectrum of the fourth intermediate frequency signal is identified through the predistortion processing module to determine that the distortion components of the fourth intermediate frequency signal contain passive intermodulation distortion and active intermodulation distortion, the first intermediate frequency signal is predistorted by active intermodulation using the fourth intermediate frequency signal through an active intermodulation distortion preprocessing model to obtain a preprocessed signal; and the predistortion signal is predistorted by passive intermodulation using the fourth intermediate frequency signal through a passive intermodulation distortion preprocessing module to obtain a target intermediate frequency signal, wherein the predistortion processing module includes the active intermodulation distortion preprocessing model and the passive intermodulation distortion preprocessing module.

[0015] In an exemplary embodiment, the target intermediate frequency signal is processed before transmission through the transmission link of the first device to obtain a second radio frequency signal, including: performing frequency conversion processing on the target intermediate frequency signal through an up-converter in the transmission link to obtain a radio frequency signal; and processing the radio frequency signal through a power amplifier PA and an isolator in the transmission link in sequence to obtain the second radio frequency signal.

[0016] In an exemplary embodiment, before obtaining the first radio frequency signal from the transmitting end of the first device, the method also includes: when the first device has N transmitting links, determining an estimation model of passive intermodulation signals generated by the N transmitting links according to configuration information of the N transmitting links, wherein the frequencies of the signals transmitted by the N transmitting links are different; when the first device transmits N signals through the N transmitting links, determining a cancellation signal corresponding to the passive intermodulation signal in each signal according to the estimation model; and generating a target parameter table according to the cancellation signal corresponding to the passive intermodulation signal in each signal, wherein the target parameter table includes cancellation signals corresponding to passive intermodulation signals of signals with different frequencies.

[0017] In an exemplary embodiment, before obtaining the first RF signal from the transmitting end of the first device, the method also includes: when the first device sends N signals through N transmitting links and receives a target signal through a receiving link, determining whether the frequency of a mixed signal generated after mixing the N signals is within a frequency band where the frequency of the target signal is located, wherein the frequency of each of the N signals is different; when it is determined that the frequency of the mixed signal generated after mixing the N signals is within the frequency band where the frequency of the target signal is located, obtaining a target parameter table, wherein the target parameter table includes cancellation signals corresponding to passive intermodulation signals with different frequency signals; obtaining a cancellation signal corresponding to each of the N signals from the target parameter table; and processing the target signal according to the cancellation signal corresponding to each of the N signals.

[0018] According to another embodiment of the present invention, a signal sending device is also provided, including: an acquisition module, used to acquire a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after the transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be sent, and the distortion component of the first radio frequency signal has passive intermodulation distortion generated by passive components in the transmitting link; a first processing module, used to perform pre-distortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is the next intermediate frequency signal to be sent after the first intermediate frequency signal; the pre-distortion processing includes pre-distortion processing of passive intermodulation; a second processing module, used to perform pre-transmission processing on the target intermediate frequency signal through the transmitting link of the first device to obtain a second radio frequency signal; a sending module, used to send the second radio frequency signal through the transmitting end of the first device.

[0019] According to yet another embodiment of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the steps of any one of the above method embodiments when run.

[0020] According to yet another embodiment of the present invention, there is provided an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0021] Through the present invention, a first radio frequency signal is obtained from the transmitting end of the first device (the distortion component of the first radio frequency signal contains the passive intermodulation distortion generated by the passive components in the transmitting link of the first device), and then the second intermediate frequency signal to be transmitted next time is subjected to passive intermodulation predistortion processing according to the first radio frequency signal to obtain the target intermediate frequency signal, and the target intermediate frequency signal is subjected to pre-transmission processing through the transmitting link of the first device to obtain the second radio frequency signal, and then the second radio frequency signal is sent through the transmitting end of the first device. Since the second intermediate frequency signal is subjected to passive intermodulation predistortion processing according to the first radio frequency signal in advance, the passive intermodulation distortion generated when the second intermediate frequency signal passes through the passive components in the transmitting link can be offset, thereby solving the problem in the related art that the passive intermodulation generated when the signal passes through the passive components cannot be eliminated, and the technical effect of eliminating the passive intermodulation generated when the signal passes through the passive components and ensuring the quality of the signal received by the receiving end is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a hardware structure block diagram of a mobile terminal according to a signal sending method according to an embodiment of the present invention;

[0023] Figure 2 is a flow chart of a signal sending method according to an embodiment of the present invention;

[0024] Figure 3 is a circuit schematic diagram of a signal sending method according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of a multiplexing loopback channel according to an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of a scenario of multi-signal sending and receiving according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of another scenario of multi-signal sending and receiving according to an embodiment of the present invention;

[0028] Figure 7is an overall flow chart of a signal sending method according to an embodiment of the present invention;

[0029] Figure 8 is a structural block diagram of a signal sending device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0032] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal according to a signal sending method according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, MCU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0033] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the signal transmission method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0034] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] In this embodiment, a signal sending method is provided, including but not limited to being used in a signal transceiver system. Figure 2 is a flow chart of a signal sending method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps S202-S208:

[0036] Step S202: Acquire a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after a transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be transmitted, and a distortion component of the first radio frequency signal includes passive intermodulation distortion generated by passive components in the transmitting link;

[0037] As an optional example, acquiring the first radio frequency signal from a transmitting end of the first device includes: acquiring the first radio frequency signal from a transmitting end of a duplexer of the first device.

[0038] As an optional example, the first intermediate frequency signal is a signal output by an intermediate frequency signal output module in the first device.

[0039] As an optional example, the passive components include: an isolator, a duplexer, and passive components at the back end of the duplexer. That is, the passive intermodulation distortion generated by the passive components in the above S202 includes the passive intermodulation distortion generated by the isolator and the duplexer and the passive intermodulation distortion reflected back by the passive components at the back end of the duplexer through the public port.

[0040] In an exemplary embodiment, Figure 3 As shown, after the intermediate frequency signal output module (TX:IF) outputs the first intermediate frequency signal, it will pass through the delay module, and then be input into the up-converter Mixer. After mixing, it will enter the power amplifier PA module, and after being input into the isolator Isolator, it will pass through the duplexer to output the first RF signal with a frequency of f1.

[0041] Step S204: performing predistortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is an intermediate frequency signal to be sent next after the first intermediate frequency signal, and the predistortion processing includes passive intermodulation predistortion processing;

[0042] It should be noted that pre-distortion is a method of reducing distortion in subsequent processing by adjusting the signal. It is usually used on amplifiers or transmitting devices to maintain signal quality and avoid unnecessary errors and interference at the receiving end.

[0043] Step S206: performing pre-transmission processing on the target intermediate frequency signal through the transmission link of the first device to obtain a second radio frequency signal;

[0044] Step S208: Send the second radio frequency signal through the transmitting end of the first device.

[0045] As an optional example, sending the second radio frequency signal through a transmitting end of the first device includes: sending the second radio frequency signal through a transmitting end of a duplexer of the first device.

[0046] Through the above steps, the first RF signal is obtained from the transmitting end of the first device (the distortion component of the first RF signal contains the passive intermodulation distortion generated by the passive components in the transmitting link of the first device), and then the second intermediate frequency signal to be sent next time is subjected to passive intermodulation predistortion processing according to the first RF signal to obtain the target intermediate frequency signal, and the target intermediate frequency signal is subjected to pre-transmission processing through the transmitting link of the first device to obtain the second RF signal, and then the second RF signal is sent through the transmitting end of the first device. Since the second intermediate frequency signal is subjected to passive intermodulation predistortion processing according to the first RF signal in advance, the passive intermodulation distortion generated when the second intermediate frequency signal passes through the passive components in the transmitting link can be offset, thereby solving the problem in the related art that the passive intermodulation generated when the signal passes through the passive components cannot be eliminated, and the technical effect of eliminating the passive intermodulation generated when the signal passes through the passive components and ensuring the quality of the signal received by the receiving end is achieved.

[0047] In an exemplary embodiment, when there are active devices in the transmission link, the distortion component of the first RF signal also includes active intermodulation distortion generated by the active devices in the transmission link, and the predistortion processing also includes predistortion processing of active intermodulation.

[0048] It should be noted that active devices refer to components that have power sources, can actively work and perform functions such as signal amplification and modulation, such as transistors and integrated circuits. Passive devices, on the contrary, do not have their own power sources and can only passively participate in the transmission and conversion process in the circuit, such as resistors, capacitors, inductors, etc. In simple terms, active devices can actively control the direction and intensity of signal flow; while passive devices can only affect the signal as it flows through them.

[0049] As an optional example, the active device in the transmission link includes: a power amplifier (Power Amplifier, referred to as PA).

[0050] In an exemplary embodiment, the above step S204 includes the following steps S11-S13:

[0051] Step S11: coupling the first radio frequency signal to a receiving end of the first device;

[0052] In an exemplary embodiment, the step S11 includes: coupling the first radio frequency signal from the transmitting end of the duplexer to the receiving end of the duplexer through a loopback channel of the duplexer;

[0053] It should be noted that the transmitting end of the first device includes the receiving end of the duplexer, and the receiving end of the first device includes the receiving end of the duplexer.

[0054] It should be noted that the loopback function of the duplexer is a traditional design of the frequency division duplexing (Frequency Division Duplexing, referred to as FDD) system. Its main function is to configure the receiving and transmitting to the same frequency, complete self-loopback at the RF end, and check whether the device itself has a fault. When the device is normal, the transmitting and receiving are configured to different frequencies, and the loopback channel is idle. In this application, when the device is working normally, no additional design is added, and the loopback channel is reused. On the basis of the isolation of the transmitting and receiving, the active intermodulation distortion and passive intermodulation distortion products of the transmitting end are coupled to the receiving end of this device. For a better understanding, Figure 4 The diagram illustrates the frequency correspondence of normal services, the frequency correspondence when the Loopback channel is enabled, and the frequency correspondence when the present application reuses the Loopback channel.

[0055] Step S12: receiving and processing the first radio frequency signal through a receiving link of the first device to obtain a third intermediate frequency signal, wherein the distortion component of the third intermediate frequency signal includes the distortion component of the first radio frequency signal;

[0056] In an exemplary embodiment, the above step S12 includes steps S121-S123:

[0057] Step S121: Processing the first radio frequency signal through a low noise amplifier LNA in the receiving link to obtain a first gain radio frequency signal;

[0058] Step S122: performing frequency conversion processing on the first gain RF signal through a down converter in the receiving link to obtain a first signal, wherein the transmitting link has an up converter, and the up converter and the down converter share a local oscillator;

[0059] It should be noted that the up-converter can convert a low-frequency signal into a high-frequency signal, and the down-converter can convert a high-frequency signal into a low-frequency signal.

[0060] Step S123: filtering the first signal through a first filter to obtain the third intermediate frequency signal, wherein the center frequency of the first filter is the frequency of the first signal.

[0061] For a better understanding, the following combination Figure 3 For specific instructions, such as Figure 3 As shown, after receiving the first RF signal, the receiving end of the first device uses a low noise amplifier LNA to process the first RF signal, and sends the processed signal to the down converter for frequency conversion processing to obtain the first signal. It should be noted that when the frequency of the first RF signal is f1, the frequency of the first signal is f0, and then the first filter corresponding to f0 is used to filter the first signal to obtain a third intermediate frequency signal.

[0062] In an exemplary embodiment, before or after receiving and processing the first radio frequency signal through the receiving link of the first device, the method further includes the following steps S21-S24:

[0063] Step S21: When the receiving end of the first device obtains the third radio frequency signal sent by the second device, the third radio frequency signal is processed by the LNA in the receiving link to obtain a second gain radio frequency signal;

[0064] Step S22: performing frequency conversion processing on the second gain RF signal through the down converter to obtain a second signal, wherein the frequency of the second signal is different from that of the first signal;

[0065] Step S23: filtering the second signal through a second filter to obtain a fourth intermediate frequency signal, wherein the center frequency of the second filter is the frequency of the second signal;

[0066] Step S24: sending the fourth intermediate frequency signal to the intermediate frequency signal receiving module of the first device.

[0067] For better understanding, Figure 3 As shown, assuming that the receiving end of the first device obtains a third RF signal with a frequency of f3 sent by the second device, the LNA in the receiving link of the first device will process the third RF signal, and the processed signal will be frequency-converted through a down-converter to obtain a second signal with a frequency of f2, and the second signal will be filtered through a second filter corresponding to f2 to obtain a fourth intermediate frequency signal, and the fourth intermediate frequency signal will be sent to the intermediate frequency signal receiving module (RX: IF).

[0068] That is to say, in this embodiment, the first device will normally process the received signals sent by other devices, and the distorted signals will pass through the feedback channel and enter the pre-distortion module RFPAL to complete the distortion cancellation processing.

[0069] Step S13: performing predistortion processing on the second intermediate frequency signal according to the third intermediate frequency signal to obtain a target intermediate frequency signal.

[0070] In an exemplary embodiment, the above step S13 can be implemented by the following steps S31-S32:

[0071] Step S31: amplifying the distortion component in the third intermediate frequency signal by a linear amplifier to obtain a fourth intermediate frequency signal;

[0072] It should be noted that the linear amplifier is a high linear amplifier.

[0073] Step S32: using the fourth intermediate frequency signal to perform predistortion processing on the second intermediate frequency signal through a predistortion processing module to obtain a target intermediate frequency signal.

[0074] like Figure 3 As shown, the distortion component in the third intermediate frequency signal can be amplified by an ultra-linear amplifier, and the processed signal can be sent to a pre-distortion processing module, and then the pre-distortion processing module uses the processed fourth intermediate frequency signal to perform pre-distortion processing on the second intermediate frequency signal output by the intermediate frequency signal output module (TX:IF) to obtain a target intermediate frequency signal.

[0075] In an exemplary embodiment, the predistortion processing module uses the fourth intermediate frequency signal to perform predistortion processing on the first intermediate frequency signal, including the following steps S41-S42:

[0076] Step S41: when the distortion spectrum of the fourth intermediate frequency signal is identified by the predistortion processing module and it is determined that the distortion component of the fourth intermediate frequency signal has passive intermodulation distortion and active intermodulation distortion, the active intermodulation distortion preprocessing model is used to perform active intermodulation predistortion processing on the first intermediate frequency signal using the fourth intermediate frequency signal to obtain a preprocessed signal;

[0077] Step S42: using the fourth intermediate frequency signal to perform passive intermodulation predistortion processing on the preprocessed signal through a passive intermodulation distortion preprocessing module to obtain a target intermediate frequency signal, wherein the predistortion processing module includes the active intermodulation distortion preprocessing model and the passive intermodulation distortion preprocessing module.

[0078] It should be noted that the working mechanism of the pre-distortion processing module (RFPAL) is as follows: Due to the differences in the generation mechanism and distortion model of passive intermodulation products and active intermodulation products, the RFPAL module has different processing methods for the two. For active intermodulation distortion products, the traditional active intermodulation distortion preprocessing model can be used for processing. For passive intermodulation distortion products (PIM), it is necessary to pre-establish a passive intermodulation distortion preprocessing module in combination with testing and simulation, and then process it through the passive intermodulation distortion preprocessing module. It should be noted that the pre-distortion processing module can determine the active intermodulation distortion and passive intermodulation distortion by segmenting and comparing the acquired distortion spectrum, and then process the active intermodulation distortion products first, and then process the passive intermodulation distortion products.

[0079] In an exemplary embodiment, performing pre-transmission processing on the target intermediate frequency signal through the transmission link of the first device to obtain a second radio frequency signal includes the following steps S51-S52:

[0080] Step S51: performing frequency conversion processing on the target intermediate frequency signal through the up-converter in the transmission link to obtain a radio frequency signal;

[0081] Step S52: sequentially process the radio frequency signal through the power amplifier PA and the isolator in the transmission link to obtain the second radio frequency signal.

[0082] like Figure 3 As shown, the target intermediate frequency signal can be frequency-converted by an up-converter in the transmission link, and the frequency-converted signal is processed by a power amplifier PA and an isolator Isolatar in sequence to obtain a second radio frequency signal.

[0083] In an exemplary embodiment, before the above step S202, the following steps S61-S63 are further included:

[0084] Step S61: when the first device has N transmission links, determining an estimation model of passive intermodulation signals generated by the N transmission links according to configuration information of the N transmission links, wherein the frequencies of the signals transmitted by the N transmission links are different;

[0085] Step S62: when the first device sends N signals through the N transmission links, determining a cancellation signal corresponding to a passive intermodulation signal in each signal according to the estimation model;

[0086] Step S63: generating a target parameter table according to the cancellation signal corresponding to the passive intermodulation signal in each signal, wherein the target parameter table contains cancellation signals corresponding to the passive intermodulation signals of different frequency signals.

[0087] It should be noted that for multiple send and multiple receive scenarios, such as Figure 5 As shown, taking 2T2R as an example, after the transmission frequencies f5 and f1 of the two channels are mixed, the generated frequency may fall within the passband of the receiving frequency f3, deteriorating the signal-to-noise ratio of the f3 signal. In the multi-transmit and multi-receive architecture, the local end will have a "transmit and receive" situation, that is, the signal generated by the mixing of the two transmission signals will fall into the receiving passband of the local end. For this distortion product (hereinafter referred to as "big third order"), before the large closed-loop ADPD containing passive intermodulation in the embodiment of the present application works, it is necessary to complete the calibration of the big third order distortion product. That is, before the device leaves the factory, according to the multi-channel configuration of the device, determine the estimation model structure for generating PIM signal estimation, and then calculate the corresponding model parameters according to the transmission signal and the receiving signal and the previously determined estimation model structure, and update the model parameters to the estimation model to obtain the estimation model, and then complete the parameter extraction of the PIM cancellation signal according to the estimation model, and then write it into an offline parameter table (that is, the above-mentioned target parameter table), and then after the device is initialized, the table can be called to complete the preprocessing of the "big third order".

[0088] In an exemplary embodiment, before the above step S204, the method further includes the following steps S71-S74:

[0089] Step S71: when the first device sends N signals through N sending links and receives a target signal through a receiving link, determining whether a frequency of a mixed signal generated after mixing the N signals is within a frequency band where the frequency of the target signal is located, wherein the frequency of each of the N signals is different;

[0090] Step S72: when it is determined that the frequency of the mixed signal generated after mixing the N signals is within the frequency band where the frequency of the target signal is located, obtaining a target parameter table, wherein the target parameter table includes cancellation signals corresponding to passive intermodulation signals with different frequency signals;

[0091] Step S73: acquiring a cancellation signal corresponding to each of the N signals from the target parameter table;

[0092] Step S74: Processing the target signal according to the cancellation signal corresponding to each of the N signals.

[0093] As an optional example, N cancellation signals corresponding to the N signals may be added to the target signal to cancel the PIM signal interfering with the reception.

[0094] That is, in this embodiment, through the above steps S71-S74, the calibration of large third-order distortion products can be completed before the large closed-loop pre-distortion of passive intermodulation works.

[0095] Obviously, the above-described embodiments are only embodiments of a part of the present invention, rather than all embodiments. In order to better understand the above method, the above process is described below in conjunction with embodiments, but it is not intended to limit the technical solutions of the embodiments of the present invention, specifically:

[0096] In an exemplary embodiment, the cancellation of passive intermodulation distortion can be introduced into the pre-distortion system, and two types of intermodulation distortion (passive intermodulation distortion and active intermodulation distortion) can be canceled simultaneously through a closed-loop system. There is no need to distinguish whether the distortion components are generated by active devices or passive devices, and the cancellation of distortion components is real-time, which can cope with various environmental changes or emergencies.

[0097] In an exemplary embodiment, Figure 3 As shown, the upper part is the TX connection diagram of the transmitter, the lower part is the RX connection diagram, and the connection part on the right is the duplexer.

[0098] The TX intermediate frequency signal f0 is output from the TX:IF module (intermediate frequency signal output module), passes through the Delay module, and is input into the up-converter Mixer. After mixing, it enters the power amplifier PA module, is input into the isolator Isolator, and then passes through the duplexer to output the RF signal with a frequency of f1.

[0099] In this embodiment, the radio frequency signal with a frequency of f1 enters the RX channel through the loopback channel of the duplexer. The distortion component of the f1 signal includes the active intermodulation distortion of the PA in the TX link and the passive intermodulation distortion reflected back through the public port (Public Port) by the isolator, the duplexer and the passive devices at the back end of the duplexer. The two intermodulation distortions enter the RX port of the duplexer at the same time; after the radio frequency signal with a frequency of f1 passes through the low noise amplifier LNA, it is frequency-converted to f0 by a down-converter that shares the local oscillator with the transmitter, and then amplified by a filter with a frequency of f0 and a high linearity amplifier, it enters the digital predistortion module RFPAL, and then the digital predistortion module uses the distorted signal to predistort the original TX channel coupled signal, and the predistorted signal is coupled into the Mixer, thereby completing the real-time predistortion processing of the two distorted signals of the entire TX system, so that the distortion of the transmitted signal is minimized.

[0100] It should be noted that the f3 signal normally received by RX is changed to f2 after passing through LNA and down-converter, and corresponds to a filter with a frequency of f2, so that the normal operation of the RX channel at this end is not affected.

[0101] It should be noted that after the above predistortion system works normally, the concept of optimization factor can be added later to minimize the large third-order signal at the TX end falling on the local RX end, thereby further optimizing the performance of the local RX signal.

[0102] It should be noted that the working mechanism of the pre-distortion processing module (RFPAL) is as follows: Due to the differences in the generation mechanism and distortion model of passive intermodulation products and active intermodulation products, the RFPAL module has different processing methods for the two. For active intermodulation distortion products, the traditional active intermodulation distortion preprocessing model can be used for processing. For passive intermodulation distortion products (PIM), it is necessary to pre-establish a passive intermodulation distortion preprocessing module in combination with testing and simulation, and then process it through the passive intermodulation distortion preprocessing module. It should be noted that the pre-distortion processing module can determine the active intermodulation distortion and passive intermodulation distortion by segmenting and comparing the acquired distortion spectrum, and then process the active intermodulation distortion products first, and then process the passive intermodulation distortion products.

[0103] The working mechanism of Loopback is as follows:

[0104] The loopback function of the duplexer is a traditional design of the FDD system. Its main function is to configure the reception and transmission to the same frequency, complete self-loopback at the RF end, and check whether the device itself has a fault. When the device is normal, the transmission and reception are configured to different frequencies, and the loopback channel is idle. In this patent, when the device is working normally, no additional design is added, and the loopback channel is reused. On the basis of the transmission and reception isolation, the active distortion and passive distortion products of the transmitter are coupled to the receiving end of the local end. The main signal and the coupled distortion signal exist at the receiving front end at the same time. After the down-converter, it is converted into f0 and f2. After passing through different filters, f2 is the normal working signal of the receiving end and is not affected; and f0 containing the distortion product passes through the feedback channel and enters the pre-distortion module RFPAL to complete the distortion cancellation processing. For a better understanding, Figure 4 The diagram illustrates the frequency correspondence of normal services, the frequency correspondence when the Loopback channel is enabled, and the frequency correspondence when the present application reuses the Loopback channel.

[0105] It should be noted that for multiple send and multiple receive scenarios, such as Figure 5 As shown, taking 2T2R as an example, after the transmission frequencies f5 and f1 of the two channels are mixed, the generated frequency may fall within the passband of the receiving frequency f3, deteriorating the signal-to-noise ratio of the f3 signal. In the multi-transmit and multi-receive architecture, the local end will experience a "transmit and receive" situation, that is, the signal generated by the mixing of the two transmission signals will fall within the receiving passband of the local end. For this type of distortion product (hereinafter referred to as "large third order"), before the large closed-loop ADPD containing passive intermodulation in the embodiment of the present application works, it is necessary to complete the calibration of the large third-order distortion product. It should be noted that Figure 5 The n in can be negative.

[0106] For the "big three-order" (send, send, fall, receive) problem, the solution is a static data collection solution, such as Figure 6 As shown in the figure, taking the example of the mixing products of two transmitting channels falling into the receiving channel, after the transmitted I and Q signals pass through the digital up converter (DUC), CFR+DPD, DAC+TXRF, PA and other modules, the intermodulation products generated by the mixing of the signals of the two transmitting channels may fall within the receiving passband of the local end. For this "large third-order" product, the processing flow is as follows:

[0107] (1) Determine the model for generating PIM signal estimation based on the multi-channel configuration of the device;

[0108] (2) According to the transmitted signal and the received signal, as well as the previously determined PIM signal model structure, the corresponding model parameters are calculated, and the model parameters are updated into the model.

[0109] (3) generating a corresponding cancellation signal according to the PIM signal that falls into the received signal;

[0110] (4) Add the cancellation signal to the received signal to cancel the PIM signal that interferes with the reception;

[0111] Before the device leaves the factory, the above method is used to perform a frequency sweep test on the frequency points as needed to complete the parameter extraction of the PIM cancellation signal, and then write it into an offline parameter table. After the device is initialized, the table is called to complete the "big third order" preprocessing.

[0112] In an exemplary embodiment, Figure 7 1 is an overall flow chart of a signal transmission method according to an embodiment of the present invention, that is, after the device is initialized, it is necessary to first complete the "large third-order" distortion product processing, and then perform pre-distortion processing including passive intermodulation, wherein the pre-distortion processing including passive intermodulation specifically includes the following steps:

[0113] (1) Distortion component extraction: Loopback is used for transmission signal coupling, and active intermodulation and passive intermodulation products can be extracted in real time. The loopback channel of the duplexer is multiplexed to couple the transmitting end frequency f1 signal to the RX port. While the active intermodulation distortion generated by the entire transmission link enters the RX channel, the passive intermodulation distortion generated by the isolator, duplexer and more passive devices at the back end will also enter the RX channel.

[0114] (2) Distorted signal filtering: The signal frequency that normally enters the RX channel is f3. The microwave local oscillator for transmission and reception is a common local oscillator design, so there is no need to add an additional frequency conversion circuit. After the two signals pass through the down-conversion mixer, they will become a receiving intermediate frequency signal with a frequency of f2 and a transmitting intermediate frequency signal with a frequency of f0. The f2 intermediate frequency signal passes through the corresponding filter and enters the receiving channel normally;

[0115] (3) Distortion component amplification: After the f0 signal passes through the corresponding filter, the extracted distortion spectrum is amplified by an ultra-linear amplifier with a gain of G and then input into one end of the transmitter pre-distortion module (RFPAL);

[0116] (4) Distortion component cancellation: The f0 signal coupled with the original transmission intermediate frequency will also enter the ADPD pre-distortion module (RFPAL). The two spectra will complete digital pre-distortion compensation in the ADPD pre-distortion module, completing the simultaneous compensation and cancellation of passive intermodulation and active intermodulation, so that the system's transmission linearity is optimized, the linear distortion of the f1 signal received by the other end is minimized, and the signal-to-noise ratio is optimized;

[0117] It should be noted that the real-time cancellation of the two intermodulation distortions is completed through the above steps, and the system starts working in real time after initialization. Even if the passive intermodulation is deteriorated due to bad weather, real-time pre-distortion can be completed through a closed loop.

[0118] It should be noted that the present application introduces the cancellation of passive intermodulation distortion into the predistortion system, and cancels two types of intermodulation distortion at the same time through a closed-loop system, without distinguishing whether the distortion component is generated by active devices or passive devices; the method and device are operated in real time based on the minimum spectrum distortion as the judgment standard, which is practical and reliable, and the PIM index of passive devices under high power no longer needs to be strictly controlled, which greatly reduces the design difficulty of passive devices, including isolators, duplexers, combiners, OMTs, etc.;

[0119] It should be noted that the technical solution of the present application can be used in all FDD communication systems. For passive intermodulation products, there are two types: near-end and far-end. The processing solution for far-end passive intermodulation products (large third order) is relatively mature, but for near-end passive intermodulation products, the traditional solution is to tighten the passive device indicators, repair or power backoff improvement, etc. This application proposes a processing solution for near-end passive intermodulation products for the first time. On the basis of not changing the existing design architecture, it realizes real-time compensation of near-end passive intermodulation products, improves the signal-to-noise ratio in real time, and greatly improves the self-healing and stability of the system.

[0120] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory (ROM / RAM), a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0121] In the present embodiment, a signal sending device is also provided, and the signal sending device is used to implement the above-mentioned embodiment and preferred implementation mode, and the description has been made no further. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the middleware device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware is also possible and conceived.

[0122] Figure 8 is a structural block diagram of a signal sending device according to an embodiment of the present invention. Figure 8 As shown, the device comprises:

[0123] An acquisition module 82 is used to acquire a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after a transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be transmitted, and a distortion component of the first radio frequency signal includes passive intermodulation distortion generated by passive components in the transmitting link;

[0124] A first processing module 84 is used to perform predistortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is an intermediate frequency signal to be sent next after the first intermediate frequency signal; the predistortion processing includes predistortion processing of passive intermodulation;

[0125] A second processing module 86, configured to perform pre-transmission processing on the target intermediate frequency signal through a transmission link of the first device to obtain a second radio frequency signal;

[0126] The sending module 88 is configured to send the second radio frequency signal through the sending end of the first device.

[0127] Through the above-mentioned device, a first RF signal is obtained from the transmitting end of the first device (the distortion component of the first RF signal contains the passive intermodulation distortion generated by the passive devices in the transmitting link of the first device), and then the second intermediate frequency signal to be sent next time is subjected to passive intermodulation predistortion processing according to the first RF signal to obtain the target intermediate frequency signal, and the target intermediate frequency signal is subjected to pre-transmission processing through the transmitting link of the first device to obtain the second RF signal, and then the second RF signal is sent through the transmitting end of the first device. Since the second intermediate frequency signal is subjected to passive intermodulation predistortion processing according to the first RF signal in advance, the passive intermodulation distortion generated when the second intermediate frequency signal passes through the passive devices in the transmitting link can be offset, thereby solving the problem in the related art that the passive intermodulation generated when the signal passes through the passive devices cannot be eliminated, and the technical effect of eliminating the passive intermodulation generated when the signal passes through the passive devices and ensuring the quality of the signal received by the receiving end is achieved.

[0128] In an exemplary embodiment, when there are active devices in the transmission link, the distortion component of the first RF signal also includes active intermodulation distortion generated by the active devices in the transmission link, and the predistortion processing also includes predistortion processing of active intermodulation.

[0129] In an exemplary embodiment, the first processing module 84 is also used to couple the first RF signal to the receiving end of the first device; receive and process the first RF signal through the receiving link of the first device to obtain a third intermediate frequency signal, wherein the distortion component of the third intermediate frequency signal includes the distortion component of the first RF signal; and pre-distort the second intermediate frequency signal according to the third intermediate frequency signal to obtain a target intermediate frequency signal.

[0130] In an exemplary embodiment, the first processing module 84 is further used to couple the first RF signal to the receiving end of the first device in the following manner: coupling the first RF signal from the transmitting end of the duplexer to the receiving end of the duplexer through a loopback channel of the duplexer; wherein the transmitting end of the first device includes the receiving end of the duplexer, and the receiving end of the first device includes the receiving end of the duplexer.

[0131] In an exemplary embodiment, the first processing module 84 is also used to process the first RF signal through a low noise amplifier LNA in the receiving link to obtain a first gain RF signal; perform frequency conversion processing on the first gain RF signal through a down converter in the receiving link to obtain a first signal, wherein the transmitting link has an up converter, and the up converter and the down converter share a local oscillator; perform filtering processing on the first signal through a first filter to obtain the third intermediate frequency signal, wherein the center frequency of the first filter is the frequency of the first signal.

[0132] In an exemplary embodiment, the above-mentioned device also includes: a third processing module, which is used to, before or after the first RF signal is received and processed through the receiving link of the first device, when the receiving end of the first device obtains the third RF signal sent by the second device, process the third RF signal through the LNA in the receiving link to obtain a second gain RF signal; perform frequency conversion processing on the second gain RF signal through the down converter to obtain a second signal, wherein the frequency of the second signal is different from that of the first signal; filter the second signal through a second filter to obtain a fourth intermediate frequency signal, wherein the center frequency of the second filter is the frequency of the second signal; and send the fourth intermediate frequency signal to the intermediate frequency signal receiving module of the first device.

[0133] In an exemplary embodiment, the first processing module is also used to amplify the distortion component in the third intermediate frequency signal through a linear amplifier to obtain a fourth intermediate frequency signal; and use the fourth intermediate frequency signal to predistort the second intermediate frequency signal through a predistortion processing module to obtain a target intermediate frequency signal.

[0134] In an exemplary embodiment, the first processing module 84 is also used to, when the distortion spectrum of the fourth intermediate frequency signal is identified by the pre-distortion processing module and it is determined that the distortion components of the fourth intermediate frequency signal contain passive intermodulation distortion and active intermodulation distortion, perform active intermodulation predistortion processing on the first intermediate frequency signal using the fourth intermediate frequency signal through an active intermodulation distortion preprocessing model to obtain a preprocessed signal; and perform passive intermodulation predistortion processing on the preprocessed signal using the fourth intermediate frequency signal through a passive intermodulation distortion preprocessing module to obtain a target intermediate frequency signal, wherein the pre-distortion processing module includes the active intermodulation distortion preprocessing model and the passive intermodulation distortion preprocessing module.

[0135] In an exemplary embodiment, the second processing module 86 is further used to perform frequency conversion processing on the target intermediate frequency signal through the up-converter in the transmitting link to obtain a radio frequency signal; and sequentially process the radio frequency signal through the power amplifier PA and the isolator in the transmitting link to obtain the second radio frequency signal.

[0136] In an exemplary embodiment, the above-mentioned device also includes: a generation module, which is used to determine, before obtaining the first radio frequency signal from the transmitting end of the first device, an estimation model of the passive intermodulation signal generated by the N transmitting links according to the configuration information of the N transmitting links when the first device has N transmitting links, wherein the frequencies of the signals transmitted by the N transmitting links are different; when the first device sends N signals through the N transmitting links, determine the cancellation signal corresponding to the passive intermodulation signal in each signal according to the estimation model; generate a target parameter table according to the cancellation signal corresponding to the passive intermodulation signal in each signal, wherein the target parameter table contains cancellation signals corresponding to passive intermodulation signals of different frequency signals.

[0137] In an exemplary embodiment, the above-mentioned device also includes: a fourth processing module, which is used to determine whether the frequency of the mixed signal generated after mixing the N signals is located within the frequency band where the frequency of the target signal is located, when the first device sends N signals through N transmitting links and receives the target signal through a receiving link before obtaining the first RF signal from the transmitting end of the first device, wherein the frequency of each of the N signals is different; when it is determined that the frequency of the mixed signal generated after mixing the N signals is located within the frequency band where the frequency of the target signal is located, obtain a target parameter table, wherein the target parameter table contains cancellation signals corresponding to passive intermodulation signals with different frequency signals; obtain the cancellation signal corresponding to each of the N signals from the target parameter table; and process the target signal according to the cancellation signal corresponding to each of the N signals.

[0138] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0139] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0140] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0141] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0142] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0143] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0144] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0145] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A signal sending method, characterized in that: include: Acquire a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after a transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be transmitted, and a distortion component of the first radio frequency signal includes passive intermodulation distortion generated by passive components in the transmitting link; Performing predistortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is an intermediate frequency signal to be sent next after the first intermediate frequency signal, and the predistortion processing includes passive intermodulation predistortion processing; Performing pre-transmission processing on the target intermediate frequency signal through a transmission link of the first device to obtain a second radio frequency signal; The second radio frequency signal is sent through the transmitting end of the first device.

2. The method according to claim 1, characterized in that In the case where there are active devices in the transmission link, the distortion component of the first radio frequency signal also includes active intermodulation distortion generated by the active devices in the transmission link, and the predistortion processing also includes predistortion processing of active intermodulation.

3. The method according to claim 1 or 2, characterized in that: The method performs predistortion processing on the second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, including: coupling the first radio frequency signal to a receiving end of the first device; receiving and processing the first radio frequency signal through a receiving link of the first device to obtain a third intermediate frequency signal, wherein a distortion component of the third intermediate frequency signal includes a distortion component of the first radio frequency signal; The second intermediate frequency signal is predistorted according to the third intermediate frequency signal to obtain a target intermediate frequency signal.

4. The method according to claim 3, characterized in that Coupling the first radio frequency signal to a receiving end of the first device includes: coupling the first radio frequency signal from the transmitting end of the duplexer to the receiving end of the duplexer through a loopback channel of the duplexer; The transmitting end of the first device includes the receiving end of the duplexer, and the receiving end of the first device includes the receiving end of the duplexer.

5. The method according to claim 3, characterized in that: The receiving link of the first device receives and processes the first radio frequency signal to obtain a third intermediate frequency signal, including: Processing the first radio frequency signal through a low noise amplifier LNA in the receiving link to obtain a first gain radio frequency signal; The first gain RF signal is frequency-converted by a down-converter in the receiving link to obtain a first signal, wherein the transmitting link has an up-converter, and the up-converter and the down-converter share a local oscillator; The first signal is filtered by a first filter to obtain the third intermediate frequency signal, wherein the center frequency of the first filter is the frequency of the first signal.

6. The method according to claim 5, characterized in that Before or after receiving and processing the first radio frequency signal through a receiving link of the first device, the method further includes: When the receiving end of the first device obtains the third radio frequency signal sent by the second device, the third radio frequency signal is processed by the LNA in the receiving link to obtain a second gain radio frequency signal; Performing frequency conversion processing on the second gain RF signal by the down converter to obtain a second signal, wherein the frequency of the second signal is different from that of the first signal; Filtering the second signal through a second filter to obtain a fourth intermediate frequency signal, wherein the center frequency of the second filter is the frequency of the second signal; The fourth intermediate frequency signal is sent to the intermediate frequency signal receiving module of the first device.

7. The method according to claim 3, characterized in that The method performs predistortion processing on the second intermediate frequency signal according to the third intermediate frequency signal to obtain a target intermediate frequency signal, comprising: amplifying the distortion component in the third intermediate frequency signal by a linear amplifier to obtain a fourth intermediate frequency signal; The predistortion processing module uses the fourth intermediate frequency signal to perform predistortion processing on the second intermediate frequency signal to obtain a target intermediate frequency signal.

8. The method according to claim 7, characterized in that The method further comprises: performing predistortion processing on the first intermediate frequency signal by using the fourth intermediate frequency signal through a predistortion processing module, comprising: When the distortion spectrum of the fourth intermediate frequency signal is identified by the predistortion processing module and it is determined that the distortion component of the fourth intermediate frequency signal includes passive intermodulation distortion and active intermodulation distortion, the active intermodulation distortion preprocessing model is used to perform active intermodulation predistortion processing on the first intermediate frequency signal using the fourth intermediate frequency signal to obtain a preprocessed signal; The passive intermodulation distortion preprocessing module uses the fourth intermediate frequency signal to perform passive intermodulation predistortion processing on the preprocessed signal to obtain a target intermediate frequency signal, wherein the predistortion processing module includes the active intermodulation distortion preprocessing model and the passive intermodulation distortion preprocessing module.

9. The method according to claim 1, characterized in that: The method of performing pre-transmission processing on the target intermediate frequency signal through the transmission link of the first device to obtain a second radio frequency signal includes: Performing frequency conversion processing on the target intermediate frequency signal through the up-converter in the transmission link to obtain a radio frequency signal; The radio frequency signal is processed in sequence through a power amplifier PA and an isolator in the transmission link to obtain the second radio frequency signal.

10. The method according to claim 1, characterized in that Before acquiring the first radio frequency signal from the transmitting end of the first device, the method further includes: In a case where the first device has N transmission links, determining, according to configuration information of the N transmission links, an estimation model of passive intermodulation signals generated by the N transmission links, wherein the frequencies of the signals transmitted by the N transmission links are different; When the first device sends N signals through the N transmission links, determining a cancellation signal corresponding to a passive intermodulation signal in each signal according to the estimation model; A target parameter table is generated according to the cancellation signal corresponding to the passive intermodulation signal in each signal, wherein the target parameter table contains cancellation signals corresponding to the passive intermodulation signals of different frequency signals.

11. The method according to claim 1, characterized in that: Before acquiring the first radio frequency signal from the transmitting end of the first device, the method further includes: When the first device sends N signals through N transmission links and receives a target signal through a reception link, determining whether a frequency of a mixed signal generated after mixing the N signals is within a frequency band where the frequency of the target signal is located, wherein the frequency of each of the N signals is different; When it is determined that the frequency of the mixed signal generated after mixing the N signals is within the frequency band where the frequency of the target signal is located, obtaining a target parameter table, wherein the target parameter table includes cancellation signals corresponding to passive intermodulation signals with different frequency signals; Acquire a cancellation signal corresponding to each of the N signals from the target parameter table; The target signal is processed according to a cancellation signal corresponding to each of the N signals.

12. A signal sending device, characterized in that: include: an acquisition module, configured to acquire a first radio frequency signal from a transmitting end of a first device, wherein the first radio frequency signal is a signal obtained after a transmitting link of the first device performs pre-transmission processing on a first intermediate frequency signal to be transmitted, and a distortion component of the first radio frequency signal includes passive intermodulation distortion generated by passive components in the transmitting link; A first processing module, configured to perform predistortion processing on a second intermediate frequency signal according to the first radio frequency signal to obtain a target intermediate frequency signal, wherein the second intermediate frequency signal is an intermediate frequency signal to be sent next after the first intermediate frequency signal; the predistortion processing includes predistortion processing of passive intermodulation; A second processing module, configured to perform pre-transmission processing on the target intermediate frequency signal through a transmission link of the first device to obtain a second radio frequency signal; A sending module is used to send the second radio frequency signal through the sending end of the first device.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program implements the steps of the method described in any one of claims 1 to 11 when executed by a processor.

14. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method described in any one of claims 1 to 11 are implemented.

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