Method and device for receiving radio frequency signals

Abstract

The embodiment of the present application discloses a method and device for receiving a radio frequency signal, wherein the method includes receiving a first radio frequency signal through an antenna; performing mirror filtering processing on the first radio frequency signal and outputting a second radio frequency signal; performing a first processing on the second radio frequency signal; performing a second processing on the second radio frequency signal; receiving a first target radio frequency signal through an antenna; performing mirror filtering processing on the first target radio frequency signal and outputting a second target radio frequency signal; performing a second processing on the second target radio frequency signal when both the accuracy of the first baseband signal and the accuracy of the second baseband signal are not lower than a preset threshold; performing a first processing on the second target radio frequency signal when the accuracy of the first baseband signal is not lower than a preset threshold and the accuracy of the second baseband signal is lower than a preset threshold. The embodiment of the present application can improve the anti-interference capability of the radio frequency receiving end in radio frequency communication scenarios where interference signals may exist.

Description

Technical Field

[0001] The present application relates to radio frequency signal processing technology, which is applied to the field of communications, and in particular to a radio frequency signal receiving method and device. Background Art

[0002] In the field of wireless RF communications, the RF receiver amplifies, filters, and frequency-converts the initial RF signal received by the receiving antenna before demodulating it into a baseband signal. The reception performance of the RF receiver directly impacts the quality of RF communication. Currently, RF receivers typically use zero-IF / low-IF reception methods to receive RF signals. This method directly converts and demodulates RF signals into baseband signals, requiring fewer components, making it easier to integrate and lowering costs. Furthermore, when using zero-IF / low-IF reception, RF signals can be transmitted over a wider bandwidth, resulting in higher communication rates.

[0003] If the RF band used by both parties for RF communication is in a band where interference signals may exist (such as an unlicensed band), there is a high probability that the initial RF signal received by the antenna contains interference signals. Due to the poor anti-interference ability of the zero-IF / low-IF method, even using a frequency hopping algorithm, it is difficult to quickly and accurately avoid interference. Therefore, in RF communication scenarios where interference signals may exist, the reception performance of the RF receiving end using the zero-IF / low-IF reception method cannot meet actual requirements. Summary of the Invention

[0004] The embodiments of the present application disclose a method and apparatus for receiving radio frequency signals, which are used to improve the anti-interference capability of a radio frequency receiving end in a radio frequency communication scenario where interference signals may exist.

[0005] In a first aspect, an embodiment of the present application provides a method for receiving a radio frequency signal, the method comprising:

[0006] receiving a first radio frequency signal through an antenna, wherein the first radio frequency signal comprises a test radio frequency signal;

[0007] performing mirror filtering on the first radio frequency signal and outputting a second radio frequency signal;

[0008] Performing a first processing on the second RF signal, wherein the first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third RF signal, and performing in-phase quadrature (IQ) frequency conversion and analog-to-digital conversion processing on the third RF signal based on a first local oscillator signal to output a first baseband signal; the center frequency of the third RF signal is equal to the center frequency of the test RF signal, the bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal, the first frequency conversion process is used to convert the RF frequency band to an intermediate frequency, and the second frequency conversion process is used to convert the intermediate frequency to a RF frequency; the center frequency of the first local oscillator signal is equal to the center frequency of the test RF signal;

[0009] performing a second processing on the second radio frequency signal, wherein the second processing includes performing IQ frequency conversion and analog-to-digital conversion processing based on the first local oscillator signal to output a second baseband signal;

[0010] receiving a first target radio frequency signal through the antenna, wherein the first target signal includes a formal communication radio frequency signal, and a center frequency point of the formal communication radio frequency signal is equal to a center frequency point of the test radio frequency signal;

[0011] performing mirror filtering on the first target radio frequency signal to output a second target radio frequency signal;

[0012] When both the accuracy rate of the first baseband signal and the accuracy rate of the second baseband signal are not lower than a preset threshold, performing the second processing on the second target RF signal, wherein the accuracy rate is used to reflect the difference between the baseband signal and a standard baseband signal corresponding to the test RF signal;

[0013] When the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold, the first processing is performed on the second target RF signal.

[0014] It should be noted that, in a radio frequency communication scenario where an interference signal may exist, the first radio frequency signal including the test radio frequency signal can be understood as the first radio frequency signal at least including the test radio frequency signal and may also include an interference signal.

[0015] The above method filters the first RF signal received by the antenna and then processes it through first and second processing, converting it into a first baseband signal and a second baseband signal. Compared to the second processing, the first processing adds a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process. This allows it to better filter out possible out-of-band interference signals in the same frequency band, and its anti-interference capability is stronger than that of the second processing. However, it reduces the bandwidth of the passing RF signal, resulting in a lower communication rate than the second processing.

[0016] Furthermore, the above method can also determine which processing method to use to process the formal communication RF signal during subsequent formal communication by whether the accuracy of the first baseband signal and the second baseband signal is lower than a preset threshold. If the accuracy of the first baseband signal and the second baseband signal are both not lower than the preset threshold, it can be indicated that the test RF signal is not interfered with by the interference signal or the degree of interference by the interference signal is negligible. In the subsequent formal communication, the communication RF signal in the same channel frequency band as the test RF signal can be processed by the second processing to output a baseband signal, thereby ensuring a higher communication rate. If the accuracy of the first baseband signal is not lower than the preset threshold and the second baseband signal is lower than the preset threshold, it can be indicated that the test RF signal is seriously interfered with by the out-of-band interference signal in the same frequency band. In the subsequent formal communication, the formal communication RF signal in the same frequency band as the test RF signal can be processed by the first processing to output a baseband signal, thereby ensuring a stronger anti-interference capability.

[0017] In summary, the above circuit can determine whether the test RF signal is interfered with by the interference signal and select an appropriate processing method for the RF signal during subsequent formal communication, thereby improving the anti-interference capability of the RF receiving end.

[0018] In combination with the first aspect, in a possible implementation, performing mirror filtering on the first RF signal and outputting a second RF signal includes:

[0019] performing a first mirror filtering process on the first radio frequency signal to output a fifth radio frequency signal;

[0020] performing signal amplification processing on the fifth radio frequency signal and outputting a sixth radio frequency signal;

[0021] Perform second mirror filtering on the sixth radio frequency signal and output the second radio frequency signal.

[0022] The above method can filter out any mirror RF signals that may be present in the first RF signal. The degree of interference caused by the mirror RF signal on the test RF signal can be equivalent to the degree of interference caused by the in-band signal at the same frequency point on the test RF signal. The center frequency of the mirror RF signal is related to the center frequency of the test RF signal. If the mirror RF signal exists and is not filtered out, it will directly affect the subsequent analog-to-digital conversion effect (i.e., the digital demodulation effect), and thus affect the final baseband signal. Therefore, the mirror filtering processing in the above method further enhances the anti-interference capability of the RF receiving circuit.

[0023] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, the performing the first processing on the second RF signal includes:

[0024] performing signal amplification processing on the second radio frequency signal and outputting a seventh radio frequency signal;

[0025] Performing harmonic filtering on the second local oscillator signal and outputting a third local oscillator signal;

[0026] performing a first frequency conversion process on the seventh radio frequency signal based on the third local oscillator signal, and outputting a first intermediate frequency signal;

[0027] performing intermediate frequency filtering on the first intermediate frequency signal to output a second intermediate frequency signal;

[0028] performing a second frequency conversion process on the second intermediate frequency signal based on the third local oscillator signal, and outputting the third radio frequency signal;

[0029] Performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputting the first baseband signal;

[0030] Among them, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

[0031] To filter out any out-of-band interference signals that may be present in the second RF signal, the second RF signal needs to be filtered to reduce its bandwidth, thereby filtering out out-of-band signals from the same frequency channel as much as possible. Considering that IF signals are easier to filter than RF signals, the second RF signal undergoes a first frequency conversion to become an IF signal, which is then filtered through an IF filter to reduce its bandwidth before finally undergoing a second frequency conversion to become a third RF signal. It is easy to understand that the center frequency of the third RF signal is equal to the center frequency of the test RF signal, and the bandwidth of the third RF signal is smaller than that of the second RF signal. The bandwidth of the third RF signal is narrower than that of the test RF signal, but its frequency band still includes the center frequency of the test RF signal. This means that the probability of out-of-band interference signals from the same frequency channel existing in the third RF signal is greatly reduced, thereby ensuring the effectiveness of subsequent IQ frequency conversion and analog-to-digital conversion, and thus ensuring a relatively ideal communication effect.

[0032] In a second aspect, an embodiment of the present application provides a radio frequency signal receiving device, the device comprising:

[0033] a receiving module, configured to receive a first radio frequency signal through an antenna, wherein the first radio frequency signal includes a test radio frequency signal;

[0034] an image filtering module, configured to perform image filtering on the first radio frequency signal and output a second radio frequency signal;

[0035] a first processing module, configured to perform a first processing on the second RF signal, wherein the first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third RF signal, and performing in-phase orthogonal IQ frequency conversion and analog-to-digital conversion on the third RF signal based on a first local oscillator signal to output a first baseband signal; a center frequency of the third RF signal is equal to the center frequency of the test RF signal, a bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal, the first frequency conversion process is used to convert the RF frequency band to an intermediate frequency, and the second frequency conversion process is used to convert the intermediate frequency to a RF frequency; the center frequency of the first local oscillator signal is equal to the center frequency of the test RF signal;

[0036] a second processing module, configured to perform a second processing on the second RF signal, wherein the second processing includes performing IQ frequency conversion and analog-to-digital conversion based on the first local oscillator signal, and outputting a second baseband signal;

[0037] The receiving module is further configured to receive a first target radio frequency signal through the antenna, wherein the first target signal includes a formal communication radio frequency signal, and a center frequency point of the formal communication radio frequency signal is equal to a center frequency point of the test radio frequency signal;

[0038] The mirror filter module is further configured to perform mirror filtering on the first target radio frequency signal and output a second target radio frequency signal;

[0039] The second processing module is further configured to perform the second processing on the second target RF signal when both the accuracy rate of the first baseband signal and the accuracy rate of the second baseband signal are not lower than a preset threshold, wherein the accuracy rate is used to reflect the difference between the baseband signal and the standard baseband signal corresponding to the test RF signal;

[0040] The first processing module is further configured to perform the first processing on the second target RF signal when the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold.

[0041] With reference to the first aspect, in a possible implementation, in performing mirror filtering on the first radio frequency signal and outputting the second radio frequency signal, the mirror filtering module is further configured to:

[0042] performing a first mirror filtering process on the first radio frequency signal to output a fifth radio frequency signal;

[0043] performing signal amplification processing on the fifth radio frequency signal and outputting a sixth radio frequency signal;

[0044] Perform second mirror filtering on the sixth radio frequency signal and output the second radio frequency signal.

[0045] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, in the first processing of the second RF signal, the first processing module is further configured to:

[0046] performing signal amplification processing on the second radio frequency signal and outputting a seventh radio frequency signal;

[0047] Performing harmonic filtering on the second local oscillator signal and outputting a third local oscillator signal;

[0048] performing a first frequency conversion process on the seventh radio frequency signal based on the third local oscillator signal, and outputting a first intermediate frequency signal;

[0049] performing intermediate frequency filtering on the first intermediate frequency signal to output a second intermediate frequency signal;

[0050] performing a second frequency conversion process on the second intermediate frequency signal based on the third local oscillator signal, and outputting the third radio frequency signal;

[0051] Performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputting the first baseband signal;

[0052] Among them, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

[0053] In a third aspect, an embodiment of the present application provides an electronic device, which is used to implement the method described in the first aspect or any possible implementation manner of the first aspect.

[0054] Optionally, the electronic device may be a wireless radio frequency receiver. Exemplarily, the electronic device may be a standalone device such as a terminal (such as a mobile phone, computer, tablet, or smartwatch), a radio, a television, a satellite positioner, or a wide-area satellite IoT signaling device, or a component (such as a chip or integrated circuit) included in a standalone device.

[0055] The beneficial effects of the devices or equipment provided in the second and third aspects of this application can refer to the beneficial effects of the technical solution in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The following is a brief introduction to the drawings required for describing the embodiments of this application.

[0057] Figure 1 This is a flow chart of a method for receiving radio frequency signals provided in an embodiment of the present application;

[0058] Figure 2 This is a flowchart of a first process provided by an embodiment of the present application;

[0059] Figure 3 This is a flow chart of another method for receiving radio frequency signals provided in an embodiment of the present application;

[0060] Figure 4 4 is a structural diagram of a radio frequency signal receiving device 40 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0062] See Figure 1 , Figure 1 This is a flow chart of a method for receiving radio frequency signals provided in an embodiment of the present application.

[0063] Step S101: the electronic device receives a first radio frequency signal via an antenna.

[0064] An electronic device is a communication device used to receive radio frequency signals (i.e., a radio frequency receiver). Optionally, the electronic device may be a wireless radio frequency receiver. For example, the electronic device may be a standalone device such as a terminal (such as a mobile phone, computer, tablet, or smartwatch), a radio, a television, a satellite positioner, or a wide-area satellite IoT signal transmitter, or a component (such as a chip or integrated circuit) contained within a standalone device.

[0065] The first RF signal includes a test RF signal. It should be noted that, in a RF communication scenario where an interference signal may exist, the first RF signal including the test RF signal means that the first RF signal at least includes the test RF signal, and may include an interference signal in the same frequency band as the test RF signal. The interference signal in this embodiment can be an out-of-band signal of the same frequency channel (i.e., a signal outside the channel bandwidth of the test RF signal), or it can be an in-band signal of the same frequency channel (i.e., a signal within the channel bandwidth of the test RF signal). The in-band signal of the same frequency channel can include an in-band signal of the same frequency point (i.e., a signal whose center frequency is the same as or close to the same as the center frequency of the test RF signal).

[0066] Step S102: The electronic device performs mirror filtering on the first radio frequency signal and outputs a second radio frequency signal.

[0067] Image filtering can remove any image RF signals that may be present in the first RF signal. The interference of the image RF signal on the test RF signal can be equivalent to the interference of the in-band signal at the same frequency point on the test RF signal. The center frequency of the image RF signal is related to the center frequency of the test RF signal. If the image RF signal exists and is not filtered out, it will directly affect the subsequent analog-to-digital conversion effect (i.e., digital demodulation effect), and thus affect the final baseband signal.

[0068] In an optional embodiment, during the mirror filtering process, the electronic device performs a first mirror filtering process on the first RF signal and outputs a fifth RF signal; then, the electronic device performs a signal amplification process on the fifth RF signal and outputs a sixth RF signal; finally, the electronic device performs a second mirror filtering process on the sixth RF signal and outputs a second RF signal.

[0069] Step S103: the electronic device performs first processing on the second radio frequency signal.

[0070] The first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third radio frequency signal, and performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal to output a first baseband signal. The center frequency of the first local oscillator signal is equal to the center frequency of the test radio frequency signal.

[0071] Specifically, to filter out the out-of-band interference signals that may exist in the second RF signal, it is necessary to filter the second RF signal to reduce the bandwidth of the second RF signal, thereby filtering out the out-of-band signals of the same frequency channel as much as possible. Considering that the intermediate frequency signal is easier to filter than the RF signal, the second RF signal is converted into an intermediate frequency signal after the first frequency conversion process, and then subjected to intermediate frequency filtering to reduce the bandwidth, and finally subjected to the second frequency conversion process to become the third RF signal. It is not difficult to understand that the center frequency of the third RF signal is equal to the center frequency of the test RF signal, and the bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal. The bandwidth of the third RF signal is narrower than that of the test RF signal, but its frequency band still includes the center frequency of the test RF signal. In other words, the probability of the presence of out-of-band interference signals of the same frequency channel in the third RF signal is greatly reduced, thereby ensuring the subsequent IQ frequency conversion and analog-to-digital conversion processing effects, that is, ensuring a relatively ideal communication effect.

[0072] It should be noted that the first frequency conversion process is used to convert the RF frequency to the IF frequency, and the second frequency conversion process is used to convert the IF frequency to the RF frequency. The first and second frequency conversion processes are inversely proportional, that is, when the first frequency conversion process is an up-conversion process, the second frequency conversion process is a down-conversion process, or when the first frequency conversion process is a down-conversion process, the second frequency conversion process is an up-conversion process.

[0073] In an optional embodiment, during the first processing of the second radio frequency signal, the electronic device may perform processing steps S201-S206. Figure 2 , Figure 2 This is a flowchart of a first process provided in an embodiment of the present application.

[0074] Step S201: the electronic device amplifies the second radio frequency signal and outputs a seventh radio frequency signal.

[0075] Step S202: The electronic device performs harmonic filtering on the second local oscillation signal and outputs a third local oscillation signal.

[0076] The harmonic filtering process is used to filter out the harmonic signal and other spurious signals in the second local oscillator signal.

[0077] Step S203: The electronic device performs a first frequency conversion process on the seventh radio frequency signal based on the third local oscillation signal, and outputs a first intermediate frequency signal.

[0078] Step S204: the electronic device performs intermediate frequency filtering on the first intermediate frequency signal and outputs a second intermediate frequency signal.

[0079] Step S205: The electronic device performs a second frequency conversion process on the second intermediate frequency signal based on the third local oscillation signal, and outputs a third radio frequency signal.

[0080] Step S206: The electronic device performs in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputs a first baseband signal.

[0081] Specifically, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

[0082] For example, the center frequency point f0 of the test radio frequency signal in the second radio frequency signal is 400 MHz and the bandwidth is 15 KHz, and the center frequency point f0 of the intermediate frequency filtering operation is 400 MHz and the bandwidth is 15 KHz. Z4 is 50MHz and the passband bandwidth is 15KHz, then according to the frequency conversion principle, the center frequency of the third local oscillator signal f Z3 It can be 350MHz (i.e. f0-f Z4 ) or 450MHz (i.e. f0+f Z4), the first intermediate frequency signal includes a test RF signal with a center frequency of 50MHz and a bandwidth of 15KHz. The third RF signal obtained by the intermediate frequency filtering process and the second frequency conversion process includes a test RF signal with a center frequency of 400MHz and a bandwidth of 15KHz. Since the intermediate frequency filtering process will reduce the bandwidth of the passing RF signal, the probability of the presence of an out-of-band interference signal of the same frequency channel in the third RF signal is greatly reduced. Therefore, the first processing can effectively filter out the out-of-band signal of the same frequency channel that interferes with the test RF signal and improve the anti-interference capability. That is to say, in the embodiment of the present application, the center frequency of the third local oscillator signal can be lower than the center frequency of the test RF signal, or it can be higher than the center frequency of the test signal.

[0083] In addition, when the center frequency of the third local oscillator signal f Z3 When the frequency is 350MHz, if the second RF signal contains a center frequency of 300MHz (i.e. f0-2f Z4 ) of the mirror RF signal, the center frequency of the mirror RF signal can also be converted to 50MHz by the first frequency conversion process, so it cannot be filtered out by the intermediate frequency filtering process. Similarly, when the center frequency of the third local oscillator signal f Z3 When the frequency is 450MHz, if the second RF signal contains a center frequency of 500MHz (i.e. f0+2f Z4 ) mirror RF signal, the center frequency of which can also be converted to 50 MHz by the first frequency conversion process, and thus cannot be filtered out by the intermediate frequency filtering process. In other words, the intermediate frequency filtering process cannot effectively filter out the mirror RF signal. Therefore, the mirror filtering process in step S102 is used to effectively filter out the mirror RF signal, preventing it from affecting the subsequent IQ frequency conversion and analog-to-digital conversion processing, further improving the circuit's anti-interference capability.

[0084] Step S104: the electronic device performs second processing on the second radio frequency signal.

[0085] The second processing involves performing IQ frequency conversion and analog-to-digital conversion based on the first local oscillator signal, outputting a second baseband signal. It can be understood that the first processing, compared to the second processing, adds a first frequency conversion process, an intermediate frequency filter, and a second frequency conversion process. This allows for better filtering of possible out-of-band interference signals within the same frequency band, and its anti-interference capability is stronger than that of the second processing. However, this reduces the bandwidth of the passing RF signal, resulting in a lower communication rate than the second processing.

[0086] After the first RF signal undergoes the first processing and the second processing respectively to obtain the first baseband signal and the second baseband signal, the electronic device can subsequently determine whether to use the first processing or the second processing in subsequent formal communication based on whether the accuracy of the baseband signal is lower than a preset threshold.

[0087] Step S105: When the accuracy of the first baseband signal and the accuracy of the second baseband signal are both not lower than a preset threshold, the electronic device performs a second processing on the second target radio frequency signal.

[0088] The second target RF signal is a signal obtained by filtering the first target RF signal received by the electronic device through the antenna. The first target signal includes the formal communication RF signal, and the center frequency of the formal communication RF signal is equal to the center frequency of the test RF signal.

[0089] The baseband signal accuracy reflects the difference between the baseband signal and the standard baseband signal corresponding to the test RF signal. In other words, the baseband signal accuracy directly affects the quality of RF communication. The lower the accuracy, the greater the difference, and the more severe the interference signal will be to the test RF signal. The preset threshold can be an empirical threshold or a threshold set based on the actual application scenario and circuit component characteristics. For example, the preset threshold can be 90%.

[0090] After determining that the accuracy of both the first baseband signal and the second baseband signal is no less than a preset threshold, the electronic device selects the second processing mode during formal communication. In other words, if the accuracy of both the first baseband signal and the second baseband signal is no less than the preset threshold, it indicates that the test RF signal is not interfered with by the interference signal, or the interference by the interference signal is negligible. In subsequent formal communication, the formal communication RF signal in the same frequency band as the test RF signal can be processed by mirror filtering and then the second processing mode to obtain a baseband signal, thereby ensuring a high communication rate.

[0091] Step S106: When the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold, the electronic device performs a first processing on the second target radio frequency signal.

[0092] After determining that the accuracy of the first baseband signal is no less than a preset threshold and the second baseband signal is no less than a preset threshold, the electronic device selects the first processing method during formal communication. In other words, if the accuracy of the first baseband signal is no less than the preset threshold and the second baseband signal is no less than the preset threshold, it can indicate that the test RF signal is subject to a high degree of interference from out-of-band signals in the same frequency channel. Therefore, during subsequent formal communication, the communication RF signal in the same frequency band as the test RF signal can be processed by mirror filtering and then the first processing method to obtain the baseband signal, ensuring strong anti-interference capabilities.

[0093] It should be noted that the embodiment of the present application does not limit the order of step S103 and step S104. In other words, the electronic device may first determine whether the accuracy of the first baseband signal is lower than a preset threshold, or may first determine whether the accuracy of the second baseband signal is lower than a preset threshold.

[0094] In an optional embodiment, the electronic device can prioritize determining whether the accuracy of the first baseband signal is lower than a preset threshold. When the accuracy of the first baseband signal is lower than the preset threshold, there is no need to determine whether the accuracy of the second baseband signal is lower than the preset threshold. Instead, it can directly determine whether the test RF signal is interfered with by the in-band signal of the same frequency point or by the out-band signal of the same frequency channel. The degree of interference is very high, thereby reducing the number of times the test RF signal is sent in actual applications, and more quickly determining the use of the first processing in subsequent formal communications.

[0095] In an optional embodiment, if the electronic device determines that the accuracy of the first baseband signal is below a preset threshold, it can be determined that the test RF signal is subject to strong interference from an in-band interference signal in the same frequency channel. In this case, regardless of whether the first or second processing is selected, the interference signal cannot be filtered out. In other words, the fact that the accuracy of the first baseband signal is below the preset threshold indicates that the channel containing the test RF signal is unavailable, and the device transmitting the test RF signal is required to resend the test RF signal on a new channel.

[0096] It should be noted that the frequency of the radio frequency signal in the embodiment of the present application belongs to the radio frequency (RF) frequency (usually defined as 300KHz-300GHz), and the embodiment of the present application does not limit the bandwidth and channel of the test radio frequency signal. The intermediate frequency (IF) frequency in the embodiment of the present application refers to the intermediate frequency to which the radio frequency band is downgraded after frequency conversion processing. It is not difficult to understand that the center frequency point of the intermediate frequency signal in the embodiment of the present application adopts a lower frequency.

[0097] Since steps S101 to S106 involve the processing of many signals, for ease of understanding, the following describes a series of processing of the first radio frequency signal by the electronic device. Figure 3 , Figure 3 This is a flow chart of another radio frequency receiving method provided in an embodiment of the present application.

[0098] The first RF signal undergoes mirror filtering to generate a second RF signal. The second RF signal undergoes signal amplification to generate a seventh RF signal. The seventh RF signal and the third local oscillator signal undergo a first frequency conversion to generate a first intermediate frequency signal (the third local oscillator signal is generated by harmonic filtering of the second local oscillator signal). The first intermediate frequency signal undergoes intermediate frequency filtering to generate a second intermediate frequency signal. The second intermediate frequency signal and the third local oscillator signal undergo a second frequency conversion to generate a third RF signal. The third RF signal and the first local oscillator signal undergo IQ frequency conversion and analog-to-digital conversion to generate a first baseband signal. The second RF signal can also be combined with the first local oscillator signal to generate a second baseband signal through IQ frequency conversion and analog-to-digital conversion. It is understood that the process of generating the first baseband signal from the second RF signal is considered the first process, and the process of generating the second baseband signal from the second RF signal is considered the second process. The principles of the first and second processes, as well as the subsequent determination of the accuracy of the first and second baseband signals, can be found in the description of steps S101 to S106 and will not be further elaborated here.

[0099] To sum up, the embodiment of the present application can determine whether the test RF signal is interfered with by the interference signal through the baseband signals obtained by the first processing and the second processing, and select a suitable processing method for the formal RF signal during subsequent formal communication, thereby improving the anti-interference capability of the RF receiving end.

[0100] The above describes in detail the method of the embodiment of the present application. In order to facilitate better implementation of the above scheme of the embodiment of the present application, the device of the embodiment of the present application is provided below accordingly.

[0101] It is understood that the apparatus provided in the embodiments of the present application, such as a radio frequency receiving apparatus, includes hardware structures, software modules, or a combination of hardware and software structures, etc., for implementing the functions of the aforementioned method embodiments. For example, when a module for performing a certain function is a hardware structure, the hardware structure may be composed of one or more circuit elements. For example, the module for filtering may be a filter, and the module for frequency conversion may be a mixer.

[0102] Those skilled in the art should easily appreciate that, in combination with the modules and steps of the various examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different device implementations to implement the aforementioned method embodiments in different usage scenarios, and different implementations of the devices should not be considered to exceed the scope of the embodiments of the present application.

[0103] The embodiments of the present application can divide the device into functional modules. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one functional module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation. For example, taking the case of dividing the functional modules of the device by integration as an example, the present application cites a possible processing device.

[0104] See Figure 4 , Figure 4 is a schematic structural diagram of a radio frequency signal receiving device 40 provided in an embodiment of the present application. The radio frequency signal receiving device 40 may be Figure 1 The electronic device in the embodiment is described. The radio frequency signal receiving device 40 may include a receiving module 401, an image filtering module 402, a first processing module 403, and a second processing module 404; each module is connected via a bus, wherein each module is described in detail as follows:

[0105] The receiving module 401 is configured to receive a first radio frequency signal through an antenna, wherein the first radio frequency signal includes a test radio frequency signal;

[0106] An image filtering module 402 is configured to perform image filtering on the first radio frequency signal and output a second radio frequency signal;

[0107] A first processing module 403 is configured to perform a first processing on the second RF signal, wherein the first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third RF signal, and performing in-phase orthogonal IQ frequency conversion and analog-to-digital conversion on the third RF signal based on a first local oscillator signal to output a first baseband signal; the center frequency of the third RF signal is equal to the center frequency of the test RF signal, the bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal, the first frequency conversion process is used to convert the RF frequency band to an intermediate frequency, and the second frequency conversion process is used to convert the intermediate frequency to a RF frequency; the center frequency of the first local oscillator signal is equal to the center frequency of the test RF signal;

[0108] A second processing module 404 is configured to perform a second processing on the second RF signal, wherein the second processing includes performing IQ frequency conversion and analog-to-digital conversion based on the first local oscillator signal to output a second baseband signal;

[0109] The receiving module 401 is further configured to receive a first target radio frequency signal through the antenna, wherein the first target signal includes a formal communication radio frequency signal, and the center frequency of the formal communication radio frequency signal is equal to the center frequency of the test radio frequency signal;

[0110] The mirror filter module 402 is further configured to perform mirror filtering on the first target radio frequency signal and output a second target radio frequency signal;

[0111] The second processing module 404 is further configured to perform the second processing on the second target RF signal when both the accuracy rate of the first baseband signal and the accuracy rate of the second baseband signal are not lower than a preset threshold, wherein the accuracy rate is used to reflect the difference between the baseband signal and the standard baseband signal corresponding to the test RF signal;

[0112] The first processing module 403 is further configured to perform the first processing on the second target RF signal when the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold.

[0113] In a possible implementation, in performing mirror filtering on the first RF signal and outputting the second RF signal, the mirror filtering module 402 is further configured to:

[0114] performing a first mirror filtering process on the first radio frequency signal to output a fifth radio frequency signal;

[0115] performing signal amplification processing on the fifth radio frequency signal and outputting a sixth radio frequency signal;

[0116] Perform second mirror filtering on the sixth radio frequency signal and output the second radio frequency signal.

[0117] In yet another possible implementation, in the performing the first processing on the second radio frequency signal, the first processing module 403 is further configured to:

[0118] performing signal amplification processing on the second radio frequency signal and outputting a seventh radio frequency signal;

[0119] Performing harmonic filtering on the second local oscillator signal and outputting a third local oscillator signal;

[0120] performing a first frequency conversion process on the seventh radio frequency signal based on the third local oscillator signal, and outputting a first intermediate frequency signal;

[0121] performing intermediate frequency filtering on the first intermediate frequency signal to output a second intermediate frequency signal;

[0122] performing a second frequency conversion process on the second intermediate frequency signal based on the third local oscillator signal, and outputting the third radio frequency signal;

[0123] Performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputting the first baseband signal;

[0124] Among them, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

[0125] It should be noted that, in the embodiments of the present application, the specific implementation and technical effects of each module can also refer to Figure 2 Corresponding description of the corresponding method embodiment.

[0126] The term "first" mentioned in the embodiments of this application is used only as a name identifier and is not used to define the order, timing, priority, or importance of multiple objects, such as the first radio frequency signal, the first processing, etc. The same rule applies to "second," "third," and "fourth," etc.

[0127] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for receiving a radio frequency signal, characterized in that: include: receiving a first radio frequency signal through an antenna, wherein the first radio frequency signal comprises a test radio frequency signal; performing mirror filtering on the first radio frequency signal and outputting a second radio frequency signal; Performing a first processing on the second RF signal, wherein the first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third RF signal, and performing in-phase orthogonal IQ frequency conversion and analog-to-digital conversion on the third RF signal based on a first local oscillator signal to output a first baseband signal; the center frequency of the third RF signal is equal to the center frequency of the test RF signal, the bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal, the first frequency conversion process is used to convert the RF frequency band to an intermediate frequency, and the second frequency conversion process is used to convert the intermediate frequency to a RF frequency; the center frequency of the first local oscillator signal is equal to the center frequency of the test RF signal; performing a second processing on the second radio frequency signal, wherein the second processing includes performing IQ frequency conversion and analog-to-digital conversion processing based on the first local oscillator signal to output a second baseband signal; receiving a first target radio frequency signal through the antenna, wherein the first target signal includes a formal communication radio frequency signal, and a center frequency point of the formal communication radio frequency signal is equal to a center frequency point of the test radio frequency signal; performing mirror filtering on the first target radio frequency signal to output a second target radio frequency signal; When both the accuracy rate of the first baseband signal and the accuracy rate of the second baseband signal are not lower than a preset threshold, performing the second processing on the second target RF signal, wherein the accuracy rate is used to reflect the difference between the baseband signal and a standard baseband signal corresponding to the test RF signal; When the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold, the first processing is performed on the second target RF signal.

2. The method according to claim 1, characterized in that The performing mirror filtering on the first radio frequency signal to output a second radio frequency signal includes: performing a first mirror filtering process on the first radio frequency signal to output a fifth radio frequency signal; performing signal amplification processing on the fifth radio frequency signal and outputting a sixth radio frequency signal; Perform second mirror filtering on the sixth radio frequency signal and output the second radio frequency signal.

3. The method according to claim 1 or 2, characterized in that The performing a first processing on the second radio frequency signal includes: performing signal amplification processing on the second radio frequency signal and outputting a seventh radio frequency signal; Performing harmonic filtering on the second local oscillator signal and outputting a third local oscillator signal; performing a first frequency conversion process on the seventh radio frequency signal based on the third local oscillator signal, and outputting a first intermediate frequency signal; performing intermediate frequency filtering on the first intermediate frequency signal to output a second intermediate frequency signal; performing a second frequency conversion process on the second intermediate frequency signal based on the third local oscillator signal, and outputting the third radio frequency signal; Performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputting the first baseband signal; Among them, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

4. A radio frequency signal receiving device, characterized in that: The device comprises: a receiving module, configured to receive a first radio frequency signal through an antenna, wherein the first radio frequency signal includes a test radio frequency signal; an image filtering module, configured to perform image filtering on the first radio frequency signal and output a second radio frequency signal; a first processing module, configured to perform a first processing on the second RF signal, wherein the first processing includes performing a first frequency conversion process, an intermediate frequency filtering process, and a second frequency conversion process to output a third RF signal, and performing in-phase orthogonal IQ frequency conversion and analog-to-digital conversion on the third RF signal based on a first local oscillator signal to output a first baseband signal; a center frequency of the third RF signal is equal to the center frequency of the test RF signal, a bandwidth of the third RF signal is smaller than the bandwidth of the second RF signal, the first frequency conversion process is used to convert the RF frequency band to an intermediate frequency, and the second frequency conversion process is used to convert the intermediate frequency to a RF frequency; the center frequency of the first local oscillator signal is equal to the center frequency of the test RF signal; a second processing module, configured to perform a second processing on the second RF signal, wherein the second processing includes performing IQ frequency conversion and analog-to-digital conversion based on the first local oscillator signal, and outputting a second baseband signal; The receiving module is further configured to receive a first target radio frequency signal through the antenna, wherein the first target signal includes a formal communication radio frequency signal, and a center frequency point of the formal communication radio frequency signal is equal to a center frequency point of the test radio frequency signal; The mirror filter module is further configured to perform mirror filtering on the first target radio frequency signal and output a second target radio frequency signal; The second processing module is further configured to perform the second processing on the second target RF signal when both the accuracy rate of the first baseband signal and the accuracy rate of the second baseband signal are not lower than a preset threshold, wherein the accuracy rate is used to reflect the difference between the baseband signal and the standard baseband signal corresponding to the test RF signal; The first processing module is further configured to perform the first processing on the second target RF signal when the accuracy of the first baseband signal is not lower than the preset threshold and the accuracy of the second baseband signal is lower than the preset threshold.

5. The device according to claim 4, characterized in that In the aspect of performing mirror filtering on the first radio frequency signal and outputting the second radio frequency signal, the mirror filtering module is further configured to: performing a first mirror filtering process on the first radio frequency signal to output a fifth radio frequency signal; performing signal amplification processing on the fifth radio frequency signal and outputting a sixth radio frequency signal; Perform second mirror filtering on the sixth radio frequency signal and output the second radio frequency signal.

6. The device according to claim 4 or 5, characterized in that In the aspect of performing the first processing on the second radio frequency signal, the first processing module is further configured to: performing signal amplification processing on the second radio frequency signal and outputting a seventh radio frequency signal; Performing harmonic filtering on the second local oscillator signal and outputting a third local oscillator signal; performing a first frequency conversion process on the seventh radio frequency signal based on the third local oscillator signal, and outputting a first intermediate frequency signal; performing intermediate frequency filtering on the first intermediate frequency signal to output a second intermediate frequency signal; performing a second frequency conversion process on the second intermediate frequency signal based on the third local oscillator signal, and outputting the third radio frequency signal; Performing in-phase and quadrature IQ frequency conversion and analog-to-digital conversion on the third radio frequency signal based on the first local oscillator signal, and outputting the first baseband signal; Among them, the intermediate frequency filtering working center frequency corresponding to the intermediate frequency filtering processing is less than the center frequency of the test RF signal, the center frequency of the third local oscillator signal is determined by the intermediate frequency filtering working center frequency and the center frequency of the test RF signal, the bandwidth of the second intermediate frequency signal is less than the bandwidth of the test RF signal, and the center frequency of the second intermediate frequency signal is equal to the intermediate frequency filtering working center frequency.

7. An electronic device, characterized in that: The electronic device is used to implement the radio frequency signal receiving method according to any one of claims 1 to 3.

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