CN114679230B - Radio frequency signal processing method, device and receiver - Google Patents
Radio frequency signal processing method, device and receiver Download PDFInfo
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- CN114679230B CN114679230B CN202011550729.8A CN202011550729A CN114679230B CN 114679230 B CN114679230 B CN 114679230B CN 202011550729 A CN202011550729 A CN 202011550729A CN 114679230 B CN114679230 B CN 114679230B
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Abstract
The application discloses a radio frequency signal processing method, a device and a receiver, wherein the method comprises the steps of detecting a first interference signal in a radio frequency signal; carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal; and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by the processor. Through the mode, detection and identification of interference signals with different frequencies and types can be realized.
Description
Technical Field
The present invention relates to the field of electronic communications technologies, and in particular, to a method and an apparatus for processing a radio frequency signal, and a receiver.
Background
In modern receivers, more and more receivers adopt a zero intermediate frequency and low intermediate frequency architecture, because of the advantages of high integration level, miniaturization, low cost, simple architecture and the like. But this way of directly converting the radio frequency to baseband is susceptible to even term distortion. For example, a second-order intermodulation interference signal is generated, and the second-order intermodulation interference signal cannot be filtered by using a filter, thereby affecting the normal operation of the receiver.
The inventors of the present application have found during long-term development that the second-order intermodulation interference signal increases with increasing input power, and increases in increments of twice the useful signal. Therefore, as the input signal increases, the second-order intermodulation interference signal increases faster than the useful signal, and when the input power is large, the system is susceptible to interference signals having frequencies close to those of the useful signal.
Disclosure of Invention
The technical problem that this application mainly solves is to provide a radio frequency signal processing method, radio frequency signal processing apparatus and receiver, can realize the detection discernment to different frequency, type interference signal.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: there is provided a radio frequency signal processing method, the method comprising: detecting a first interference signal in the radio frequency signal; carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal; and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by the processor.
The first interference signal is a sine wave signal with a direct current component, and the detection of the first interference signal in the radio frequency signal comprises the following steps: and performing detection processing on the radio frequency signal to obtain a sine wave signal with a direct current component.
The first interference signal is a sine wave signal without a direct current component, and the detection of the first interference signal in the radio frequency signal comprises the following steps: performing detection processing on the radio frequency signal to obtain a sine wave signal with a direct current component; and performing DC removal processing on the sine wave signal with the DC component to obtain the sine wave signal without the DC component.
Wherein, carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal further comprises: the first interfering signal is attenuated and delayed.
Wherein the third interference signal is a level signal, comparing the first interference signal with the second interference signal, and forming the third interference signal corresponding to the first interference signal includes: if the first interference signal is smaller than the second interference signal, the third interference signal is a high-level signal; if the first interference signal is larger than the second interference signal, the third interference signal is a low level signal.
The first interference signal is a second-order intermodulation interference signal with the frequency less than or equal to 10 KHz.
The method further comprises the steps of comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, and then: and sending the third interference signal to the mixer so that the mixer processes the radio frequency signal to obtain an effective signal.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: the radio frequency signal processing device comprises an interference signal processing circuit, wherein the interference signal processing circuit comprises a detection circuit, a processing circuit and a comparison circuit; the detection circuit is used for detecting a first interference signal in the radio frequency signal; the processing circuit is used for carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal; the comparison circuit is used for comparing the first interference signal and the second interference signal to form a third interference signal corresponding to the first interference signal, and the third interference signal is a signal which can be detected and identified by the processor.
The detection circuit comprises a detection circuit and a DC removing circuit, the detection circuit comprises a diode and a first capacitor, the first end of the diode is a receiving end of a radio frequency signal, the second end of the diode is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the DC removing circuit comprises a first resistor and a second capacitor, wherein the first end of the first resistor is connected with the first end of the first capacitor and the first end of the second capacitor, and the second end of the first resistor is grounded; the processing circuit comprises a second resistor and a third capacitor, wherein the first end of the second resistor is connected with the second end of the second capacitor, the second end of the second resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is grounded; the comparison circuit comprises an operational amplifier and a third resistor, the operational amplifier comprises a first input end, a second input end and an output end, the first input end of the operational amplifier is connected with the first end of the third capacitor, the second input end of the operational amplifier is connected with the second end of the second capacitor, the output end of the operational amplifier is connected with the first end of the third resistor, and the second end of the third resistor is the output end of the third interference signal.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: there is provided a receiver comprising an antenna and radio frequency signal processing means; the antenna is used for receiving radio frequency signals; the radio frequency signal processing device is connected with the antenna and comprises an interference signal detection circuit, wherein the interference signal detection circuit comprises an interference signal processing circuit and a processor, and the interference signal processing circuit is used for detecting a first interference signal in radio frequency signals; carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal; and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by the processor.
The beneficial effects of this application are: compared with the prior art, the method provided by the application has the advantages that the detected interference signals are attenuated, amplified and delayed, and then the signals before and after the processing are compared, so that the detection of the interference signals is converted into the detection of the difference between the signals, the limiting requirements of the detected signals can be reduced, the detection of the interference signals with different frequencies and different types is realized, and the influence of the interference signals is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a receiver provided in the present application;
FIG. 2 is a schematic diagram of an embodiment of an interference signal detection circuit provided in the present application;
FIG. 3 is a schematic waveform diagram of the output of the comparator circuit in the interference signal detection circuit provided by the present application;
fig. 4 is a schematic diagram of a specific structure of an interference signal processing circuit provided in the present application;
fig. 5 is a schematic structural diagram of another embodiment of a receiver provided in the present application;
FIG. 6 is a schematic diagram showing a comparison of waveforms of signals output from a front and rear detection circuit of a low noise amplifier in the RF signal processing apparatus provided in the present application;
FIG. 7 is a flowchart illustrating an embodiment of a method for processing RF signals according to the present application;
fig. 8 is a flowchart of another embodiment of a method for processing an rf signal according to the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application provides a receiver, has set up interference signal detection circuit in this receiver, and interference signal detection circuit includes interference signal processing circuit and treater, and interference signal processing circuit can be with different frequencies, the interference signal of different grade type is handled into the signal form that the treater can discern to realize the detection to different frequencies, different grade type interference signal, and then reduce the influence of interference signal to the receiver.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a receiver provided in the present application. The receiver comprises an antenna 10 and radio frequency signal processing means 20, the antenna 10 being arranged to receive radio frequency signals, the radio frequency signal processing means 20 being connected to the antenna 10 for processing the received radio frequency signals.
The radio frequency signal processing device 20 includes an interference signal detection circuit 21, where the interference signal detection circuit 21 includes an interference signal processing circuit 211 and a processor 213 that are connected to each other, and the interference signal processing circuit 211 can process an interference signal, and can process the interference signal into a form that can be identified by the processor 213, so that the interference signal can be detected and identified, so as to reduce an influence of the interference signal on the receiver.
The receiver provided by the application can adopt a zero intermediate frequency and low intermediate frequency architecture, and the receiver of the zero intermediate frequency and low intermediate frequency architecture has the advantages of high integration level, miniaturization, low cost, simple architecture and the like. However, the signal processing mode of directly converting the radio frequency to the baseband is easily affected by even term distortion, and interference signals which cannot be filtered by using a filter may be generated, so that the normal operation of the receiver is affected. These interfering signals are typically lower frequency signals that are not easily detected by identification. According to the method, the interference signal processing circuit 211 and the processor 213 are additionally arranged in the receiver, the interference signal processing circuit 211 can process interference signals with different frequencies and different types into signal forms which can be identified by the processor 213, so that detection of the interference signals with different frequencies and different types is realized, and the influence of the interference signals on the receiver is reduced.
Specifically, after extracting the interference signal, the interference signal processing circuit 211 divides the interference signal into two paths, one path is kept as it is, and the other path is subjected to attenuation/amplification/delay processing, then compares the two paths of signals, and then detects the comparison result. The detection of the interference signals is realized by comparing the difference of signals in the two circuits, namely, the detection of the interference signals is converted into the detection of the difference between the signals, so that the limitation requirements of the detected signals can be reduced, and the detection of the interference signals with different frequencies and different types is realized. The output form of the comparison result may be set as needed, for example, a processor 213 is used as a detector of the comparison result in the present application, and thus the comparison result may be output using a form recognizable by the processor 213.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of an interference signal detection circuit provided in the present application. In this embodiment, the interference signal processing circuit 211 includes at least a detection circuit 2111, a processing circuit 2113, and a comparison circuit 2115. The processing circuit 2113 is connected to the detection circuit 2111 and the comparison circuit 2115, respectively, and the detection circuit 2111 is connected to the comparison circuit 2115.
Specifically, the detection circuit 2111 is configured to detect an interference signal in the rf signal, which may be referred to as a first interference signal. The processing circuit 2113 is connected to the detecting circuit 2111, and is configured to attenuate/amplify/delay the first interference signal to obtain a processed interference signal, which may be referred to as a second interference signal.
The comparison circuit 2115 is connected to the detection circuit 2111 and the processing circuit 2113, and is configured to compare the first interference signal and the second interference signal to obtain a difference between the two signals, output a comparison result, and record the comparison result as a third interference signal, and identify and detect the third interference signal to realize detection of the interference signal. The first interference signal can be identified by detecting the third interference signal, that is, whether the third interference signal is substantially the first interference signal or the first interference signal is detected, or the first interference signal is converted into the third interference signal which is easier to be detected, so that the third interference signal and the first interference signal have a certain corresponding relation. The output form of the comparison result (i.e., the form of the third interference signal) may be set as needed, for example, the processor 213 is used as a detector of the comparison result in this application, and thus the output third interference signal should be a form that the processor 213 can recognize. Further, in order to enable a better difference between the first interference signal and the second interference signal, a more manageable signal form may be selected, for example, the first interference signal may be a sine wave signal, which has a significant difference after being attenuated/amplified/delayed.
With continued reference to fig. 2, in one embodiment, the detection circuit 2111 includes at least a detection circuit 2111-1, and the detection circuit 2111-1 can demodulate the radio frequency signal to extract the interference signal. The detection circuit 2111-1 may output the detection result in the form of a sine wave signal with a dc component, and if an interference signal is present in the radio frequency signal, a sine wave signal with a dc component is output, and if no interference signal is present in the radio frequency signal, a pure dc signal is output.
The processing circuit 2113 may attenuate or amplify the interference signal such that the amplitude of the interference signal is reduced, differing from the interference signal that has not been processed by the processing circuit 2113. The processing circuit 2113 may delay the interference signal as needed, so that the period between the interference signal processed by the processing circuit 2113 and the interference signal not processed by the processing circuit 2113 is shifted. In other embodiments, the processing circuit 2113 may also perform delay processing while performing attenuation processing on the interference signal, which is not particularly limited herein.
Fig. 3 is a schematic waveform diagram of an output of a comparison circuit in an interference signal detection circuit provided in the present application, in fig. 3, a signal 1 is an interference signal obtained after processing by a detection circuit 2111-1, a signal 2 is an interference signal obtained after processing by a processing circuit 2113, and in this embodiment, the processing circuit 2113 attenuates the interference signal. Specifically, after the signal 2 is attenuated by the processing circuit 2113, the amplitude of the signal 2 is reduced relative to the signal 1 which is not attenuated, so that the difference between the signal 1 and the signal 2, that is, the difference between the detected interference signal and the attenuated interference signal can be generated.
The comparison circuit 2115 can compare the received detected interference signal with the attenuated/amplified/delayed interference signal to form a signal corresponding to the detected interference signal, that is, the comparison circuit 2115 converts the detected interference signal into a difference signal. The form of the signal output by the comparison circuit 2115 may be set according to the device for detecting the output signal of the comparison circuit 2115, for example, the comparison circuit 2115 may output the result in the form of a level signal so that the signal output by the comparison circuit 2115 can be recognized by the processor 213.
As shown in fig. 3, the signal 3 is a level signal output from the comparison circuit 2115. The comparison circuit 2115 performs comparison processing on the signal 1 and the signal 2 to form a signal corresponding to the signal 1, that is, the comparison circuit 2115 converts the signal 1 into a signal 3 that can be detected and identified based on the comparison processing result, thereby enabling the signal 1 to be detected and identified. Specifically, from left to right, in the cycle period of the first 1/2 of the signal 1, the signal strength of the signal 1 is smaller than the signal strength of the signal 2, and then the signal 3 is a high level signal; and in the cycle period of the latter 1/2 of the signal 1, the signal strength of the signal 1 is greater than the signal strength of the signal 2, and the signal 3 is a low level signal. The signals within the other cycle periods of the signal 1 are compared with the signal 2 in the above manner to obtain corresponding level signals, which are not described here again.
Further, if the detected interference signal and the attenuated/amplified/delayed interference signal are different, the comparator 2115 outputs a high-low level signal having the same frequency as the detected interference signal, otherwise outputs a 0V low level signal, thereby realizing detection of the interference signal.
The processor 213 may be a programmable logic device (CPLD, complex Programming Logic Device), a digital signal processor (DSP, digital Signal Process), a programmable logic controller (PLC, programmable Logic Controller), a field programmable gate array (FPGA, field Programmable Gate Array), or the like, which is not particularly limited herein.
In other embodiments, the detection circuit 2111 may further include a dc removing circuit 2111-3, and the dc removing circuit 2111-3 may perform dc removing processing on the radio frequency signal demodulated by the detection circuit 2111-1 to obtain an interference signal after dc removing. The dc link circuit 2111-3 may output the result as a sine wave signal, if an interference signal is present in the rf signal, a sine wave signal, and if no interference signal is present in the rf signal, a 0V low level signal.
In the above embodiment, the dc removal processing before the attenuation/amplification/delay processing may be performed on the interference signal, or the dc removal processing may be performed after the attenuation/amplification/delay processing.
Referring to fig. 4, fig. 4 is a schematic diagram of a specific structure of an interference signal processing circuit provided in the present application. In this embodiment, the interference signal processing circuit 211 includes a detection circuit 2111, a processing circuit 2113, and a comparison circuit 2115, the detection circuit 2111 includes a detection circuit 2111-1 and a dc removal circuit 2111-3, the processing circuit 2113 is connected to the detection circuit 2111 and the comparison circuit 2115, respectively, and the detection circuit 2111 is connected to the comparison circuit 2115.
The detection circuit 2111-1 includes a diode D1 and a first capacitor C1, the dc removing circuit 2111-3 includes a first resistor R1 and a second capacitor C2, the processing circuit 2113 includes a second resistor R2 and a third capacitor C3, and the comparing circuit 2115 includes an operational amplifier U1, a third resistor R3 and a power supply terminal VDD.
Specifically, the detection circuit 2111-1 includes a diode D1 and a first capacitor C1, a first end of the diode D1 is a radio frequency signal receiving end, a second end of the diode D1 is connected to the first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded. The voltage of the diode D1 may be set to 50V, and the capacitance value of the first capacitor C1 may be set to 180pF, which is not particularly limited herein. The detection circuit 2111-1 is provided to demodulate a received radio frequency signal to extract an interference signal contained in the radio frequency signal.
The dc removing circuit 2111-3 includes a first resistor R1 and a second capacitor C2, where a first end of the first resistor R1 is connected to a first end of the first capacitor C1 and a first end of the second capacitor C2, and a second end of the first resistor R1 is grounded. The capacitance value of the second capacitor C2 may be set to 0.01 μf, and the resistance value of the first resistor R1 may be set to 110kΩ, which is not particularly limited herein. It will be appreciated that other circuit modes may be employed for dc removal circuit 2111-3, and are not limited to RC circuits. The dc removing circuit 2111-3 is configured to perform dc removing processing on the interference signal output from the detecting circuit 2111-1, so that the signal after dc removing processing only includes a sine wave signal.
The processing circuit 2113 includes a second resistor R2 and a third capacitor C3, where a first end of the second resistor R2 is connected to a second end of the second capacitor C2, a second end of the second resistor R2 is connected to a first end of the third capacitor C3, and a second end of the third capacitor C3 is grounded. The resistance value of the second resistor R2 may be set to 1mΩ, and the capacitance value of the third capacitor C3 may be set to 680pF, which is not particularly limited herein. In other embodiments, other ways of delay attenuating the signal may be used, and not limited to RC circuits, for example, phase shifters may be used.
The comparison circuit 2115 includes an operational amplifier U1 and a third resistor R3, the operational amplifier U1 includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the operational amplifier U1 is connected to the first terminal of the third capacitor C3, the second input terminal of the operational amplifier U1 is connected to the second terminal of the second capacitor C2, the output terminal of the operational amplifier U1 is connected to the first terminal of the third resistor R3, the second terminal of the third resistor R3 is an output terminal of the third interference signal, and the operational amplifier U1 further includes one terminal connected to the power supply VDD and one terminal grounded. The resistance value of the third resistor R3 may be set to 1kΩ, and the voltage of the power supply terminal VDD may be set to 3V, which is not particularly limited herein. The comparison circuit 2115 is configured to convert the interference signal into a signal form which can be detected and identified by comparison processing based on the interference signal received through the processing circuit 2113 and the interference signal received through the dc removal circuit 2111-3, so as to realize detection of the interference signal.
The above embodiment provides a receiver, which is provided with an interference signal detection circuit, and the interference signal detection circuit can detect an interference signal in a radio frequency signal, and divide the extracted interference signal into two paths, wherein one path of the interference signal is kept unchanged, and the other path of the interference signal is subjected to attenuation/amplification/delay processing, so that the two paths of the interference signals are different, and a signal form corresponding to the interference signal which is not subjected to attenuation/amplification/delay processing is formed by comparing the difference of the two paths of the interference signals, that is, the interference signal which is not subjected to attenuation/amplification/delay processing is converted into a signal form which can be identified by a processor, thereby realizing detection and identification of the interference signal in the radio frequency signal, reducing the influence of the interference signal on the receiver, and improving the anti-interference capability of the receiver.
In other embodiments, the radio frequency signal processing device 20 includes an interfering signal processing circuit 211. The interference signal processing circuit 211 may be provided as an integrated circuit with high integration and miniaturization in a receiver, a radio, or the like, so as to process signals in the device. It will be appreciated that the interfering signal processing circuitry 211 may also be implemented in a different device as a single circuit.
Referring to fig. 5 and fig. 6, fig. 5 is a schematic structural diagram of another embodiment of a receiver provided in the present application, and fig. 6 is a schematic comparison diagram of waveforms output by a front-to-back detection circuit of a signal passing through a low noise amplifier in a radio frequency signal processing apparatus provided in the present application. In this embodiment, the receiver adopts a zero intermediate frequency and low intermediate frequency architecture, and the first interference signal is an interference signal with a frequency less than or equal to 10KHz, for example, may be a second-order intermodulation interference signal with a frequency less than or equal to 10KHz, or may be another interference signal with a frequency less than or equal to 10KHz, where the interference signals with a frequency less than or equal to 10KHz are not easy to be detected and identified in time by the rear end of the receiver, so that the normal operation of the receiver is affected. In this embodiment, the receiver includes a receiving circuit 23 and an interference signal detecting circuit 21, the receiving circuit 23 can process the radio frequency signal received by the antenna, most of the radio frequency signal continues to enter the post-stage circuit of the receiving circuit 23, and the small part of the radio frequency signal is coupled to the interference signal detecting circuit 21 by coupling, so that the radio frequency signal processed by the receiving circuit 23 is more beneficial to the detection of the interference signal with the frequency less than or equal to 10KHz by the interference signal detecting circuit 21, and the influence of the interference signal on the receiver is further improved.
The receiver comprises an antenna 10 and radio frequency signal processing means 20. The radio frequency signal processing device 20 comprises an interference signal detection circuit 21 and a receiving circuit 23 connected to each other, and the receiver can couple a received signal part to the interference signal detection circuit 21 to process an interference signal in the radio frequency signal processed by the receiving circuit 23 so that the interference signal is processed into a form which can be identified to reduce the influence of the interference signal on the receiver.
The receiving circuit 23 can process the radio frequency signals received by the antenna 10, so that most of the interference signals in the radio frequency signals are filtered, and the radio frequency signals processed by the receiving circuit 23 are more beneficial to the interference signal detection circuit 21 to detect the interference signals in the radio frequency signals. The interference signal detection circuit 21 may also feed back the detection result to the receiving circuit 23, so that the interference signal that is not easily identified in the receiving circuit 23 can be weakened, so as to reduce the influence of the interference signal on the receiver.
With continued reference to fig. 5, the receiving circuit 23 includes at least a low-pass filter 231, a radio frequency switch 232, a high-pass filter 233, a low noise amplifier 234, a first switch 235, an attenuator 236, a second switch 237, a controller 238, and a frequency generator 239.
Specifically, the low-pass filter 231 is connected to the antenna 10, and is configured to pass signals with useful frequencies among the received rf signals, and to suppress signals with non-useful frequencies, i.e. set a desired frequency point, allow signals lower than the desired frequency point to pass, and filter signals higher than the desired frequency point, so as to eliminate part of interference signals.
The rf switch 232 is connected to the low-pass filter 231 for switching the transmission path of the rf signal. For example, the receiving circuit 23 of the present application is configured to receive a radio frequency signal, i.e. the radio frequency switch 232 is switched to enable the receiving circuit 23 to receive and transmit the radio frequency signal. It will be appreciated that the radio frequency switch 232 may also be switched to allow the receive circuit 23 to be used to transmit signals.
The high-pass filter 233 is connected to the rf switch 232, and is configured to filter the signal output by the rf switch 232, so that the signal with the useful frequency in the rf signal after low-pass filtering passes, and meanwhile, the signal with the non-useful frequency is suppressed, that is, a desired frequency point is set, the signal higher than the desired frequency point is allowed to pass, and the signal lower than the desired frequency point is filtered, so as to further eliminate part of the interference signal.
The low noise amplifier 234 is connected to the high pass filter 233, and is configured to amplify the signal output from the high pass filter 233; specifically, as shown in fig. 6, since the filtered signal includes an interference signal with a lower frequency, the strength of the interference signal with a frequency crossing can be increased by the low-noise amplification processing, and the waveform amplitude of the output interference signal is increased, wherein a small part of the radio frequency signal after the low-noise amplification processing is coupled into the interference signal detection circuit 21 for processing and detecting, so as to facilitate the detection processing of the interference signal.
The first switch 235 is connected to the low noise amplifier 234, and selects a transmission path for a signal output from the low noise amplifier 234.
The attenuator 236 is connected to the first switch 235, and is configured to attenuate the signal output by the low noise amplifier 234, that is, adjust the signal to a certain magnitude, and attenuate the interference signal contained in the signal output by the low noise amplifier 234 to a certain extent, so as to attenuate the influence of the interference signal.
The second switch 237 is connected to the attenuator 236, and is used to select a transmission path for a signal output from the attenuator 236.
The mixer 238 is connected to the second switch 237, and the frequency generator 239 is connected to the mixer 238. The frequency generator 239 may be used to generate a signal source with a fixed frequency, and may be specifically set according to the signal frequency required by the receiving circuit 23, which is not specifically limited herein. A mixer 238 for mixing the signal output from the attenuator 236 with the signal output from the frequency generator 239 to obtain an intermediate frequency signal; and the mixer 238 is further used for performing analog-to-digital conversion, demodulation, etc. on the intermediate frequency signal to obtain a baseband signal; at the same time, the mixer 238 may adaptively filter, so that the interference signal fed back by the interference signal detection circuit 21, which is not easily recognized by the receiving circuit 23, can be attenuated, so as to reduce the influence of the interference signal on the receiver.
The embodiment provides a receiver, which is provided with a receiving circuit and an interference signal detection circuit, wherein the receiving circuit can carry out filtering and low-noise amplification processing on a radio frequency signal, and couple a part of the radio frequency signal after low-noise amplification to the interference signal detection circuit so as to realize interference detection. The interference signal amplitude in the radio frequency signal is increased by filtering and low-noise amplification processing, so that the interference signal is easier to detect, the interference signal detection circuit is beneficial to detecting the interference signal in the radio frequency signal, the detection capability of the receiver on the interference signal in the radio frequency signal is improved, and the influence of the interference signal on the receiver is reduced.
Referring to fig. 2 and fig. 7, fig. 7 is a flowchart of an embodiment of a method for processing an rf signal, which specifically includes the following steps:
s310: a first interfering signal in the radio frequency signal is detected.
In this embodiment, in order to be able to detect the first interference signal in the outgoing frequency signal, the radio frequency signal may be demodulated, and the interference signal included in the outgoing frequency signal may be extracted.
S320: and carrying out attenuation/amplification/delay on the first interference signal to obtain a second interference signal.
The interference signal processing circuit 211 may perform attenuation/amplification/delay processing on the first interference signal, and may adjust the magnitude of the first interference signal or delay the input of the first interference signal, and use the first interference signal whose magnitude is changed or delay the input of the first interference signal as the second interference signal.
S330: and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by the processor.
The first interference signal extracted from the radio frequency signal can be divided into two paths, one path is processed into a second interference signal, the other path is kept as it is, and the detection of the interference signal is realized by comparing the difference of the two paths of signals, namely the first interference signal and the second interference signal, and forming a third interference signal corresponding to the first interference signal according to the difference of the two signals, namely converting the first interference signal into the third interference signal which can be detected and identified.
Wherein the third interfering signal is in the form of a signal that can be recognized by the processor 213.
Referring to fig. 5 and 8, fig. 8 is a flowchart illustrating another embodiment of a method for processing an rf signal according to the present application. In a specific embodiment, the scheme shown in fig. 8 may be used for interference signal processing, so that the interference signal in the radio frequency signal can be detected and identified by the processor 213, and specifically includes the following steps:
s410: and performing interference detection on the radio frequency signal to obtain a sine wave signal with a direct current component.
In this embodiment, the radio frequency signal may be a radio frequency signal after being subjected to filtering and low noise amplification. Most interference signals can be filtered through the filtering processing of the radio frequency signals, the amplitude of the interference signals which are not filtered can be increased through the low-noise amplification processing, and the detection of the interference signals which are not filtered in the radio frequency signals is facilitated.
The detection circuit 2111-1 demodulates a small portion of the radio frequency signal coupled from the reception circuit 23 to extract an interference signal included in the radio frequency signal. The detection circuit 2111-1 may output the detection result in the form of a sine wave signal with a dc component, and if an interference signal exists in the radio frequency signal, output a sine wave signal with a dc component; and if no interference signal exists in the radio frequency signal, outputting a pure direct current signal.
S420: and performing DC removal processing on the sine wave signal with the DC component to obtain a first interference signal.
The dc removing circuit 2111-3 may perform dc removing processing on the sine wave signal with dc component to obtain a sine wave signal without dc component, and use the sine wave signal without dc component as the first interference signal, where the frequency of the obtained sine wave signal is the frequency of the interference signal in the radio frequency signal; if the signal detected by the detector circuit 2111-1 is a pure dc signal, the pure dc signal is subjected to dc processing to obtain a 0V low level signal.
The first interference signal is an interference signal with a frequency less than or equal to 10KHz, for example, may be a second-order intermodulation interference signal with a frequency less than or equal to 10KHz, or may be another interference signal with a frequency less than or equal to 10KHz, which is not limited herein.
S430: and carrying out attenuation and delay processing on the first interference signal to obtain a second interference signal.
The processing circuit 2113 may attenuate the first interference so that the amplitude of the first interference signal is reduced, and the scaling circuit 2113 may delay the first interference signal to obtain a first interference signal with reduced amplitude and delayed input, where the first interference signal with reduced amplitude and delayed input is used as the second interference signal, so that the second interference signal and the first interference signal are different. It will be appreciated that in other application scenarios, the processing circuit 2113 may amplify the signal as desired.
In other embodiments, the processing circuit 2113 attenuates and delays the sine wave signal with or without the dc component detected by the detection circuit 2111-1, and then the dc removal circuit 2111-3 removes the dc component.
S440: the first interference signal and the second interference signal are compared to form a third interference signal corresponding to the first interference signal.
The comparison circuit 2115 may process the received first interference signal and the second interference signal to form a third interference signal that can be detected and identified, that is, the comparison circuit 2115 may convert the first interference signal into a signal form that is easier to be detected and identified, so as to implement detection of the interference signal.
The third interference signal is a level signal with the same frequency as the first interference signal. The high level is the power supply voltage of the operational amplifier U1 in the comparator circuit 2115, and may be specifically set according to the power supply terminal VDD and the requirements of the processor 213, and is not specifically limited herein.
According to the radio frequency signal processing method, the interference signals in the radio frequency signals can be detected, the extracted interference signals are divided into two paths, one path of interference signals are kept unchanged, the other path of interference signals are subjected to attenuation/amplification/delay processing, so that difference is generated between the two paths of interference signals, and a signal form corresponding to the interference signals which are not subjected to attenuation/amplification/delay processing is formed by comparing the difference between the two paths of interference signals, namely, the interference signals which are not subjected to attenuation/amplification/delay processing are converted into the signal form which can be identified by a processor, so that detection and identification of the interference signals in the radio frequency signals are realized, and influence of the interference signals is reduced.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.
Claims (10)
1. A method of radio frequency signal processing, the method comprising:
detecting a first interference signal in the radio frequency signal;
carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal;
and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by a processor.
2. The method for processing a radio frequency signal according to claim 1, wherein,
the first interference signal is a sine wave signal with a direct current component, and the detecting the first interference signal in the radio frequency signal comprises:
and performing detection processing on the radio frequency signal to obtain the sine wave signal with the direct current component.
3. The method for processing a radio frequency signal according to claim 1, wherein,
the first interference signal is a sine wave signal without a direct current component, and the detecting the first interference signal in the radio frequency signal comprises:
performing detection processing on the radio frequency signal to obtain a sine wave signal with a direct current component;
and performing DC removal processing on the sine wave signal with the DC component to obtain the sine wave signal without the DC component.
4. The method for processing a radio frequency signal according to claim 1, wherein,
the attenuating/amplifying/delaying the first interference signal to obtain a second interference signal further includes:
and carrying out attenuation and delay processing on the first interference signal.
5. The method for processing a radio frequency signal according to claim 1, wherein,
the third interference signal is a level signal, and the comparing the first interference signal and the second interference signal to form a third interference signal corresponding to the first interference signal includes:
if the first interference signal is smaller than the second interference signal, the third interference signal is a high-level signal;
and if the first interference signal is larger than the second interference signal, the third interference signal is a low-level signal.
6. The method for processing a radio frequency signal according to claim 1, wherein,
the first interference signal is a second-order intermodulation interference signal with the frequency less than or equal to 10 KHz.
7. The method for processing a radio frequency signal according to claim 1, wherein,
the comparing the first interference signal and the second interference signal to form a third interference signal corresponding to the first interference signal further comprises:
and sending the third interference signal to a mixer so that the mixer processes the radio frequency signal to obtain an effective signal.
8. A radio frequency signal processing apparatus comprising an interfering signal processing circuit, the interfering signal processing circuit comprising:
a detection circuit for detecting a first interference signal in the radio frequency signal;
the processing circuit is used for carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal;
and the comparison circuit is used for comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, and the third interference signal is a signal which can be detected and identified by the processor.
9. The radio frequency signal processing apparatus according to claim 8, wherein,
the detection circuit comprises a detection circuit and a DC removing circuit, the detection circuit comprises a diode and a first capacitor, the first end of the diode is a receiving end of a radio frequency signal, the second end of the diode is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the DC removing circuit comprises a first resistor and a second capacitor, wherein the first end of the first resistor is connected with the first end of the first capacitor and the first end of the second capacitor, and the second end of the first resistor is grounded;
the processing circuit comprises a second resistor and a third capacitor, wherein the first end of the second resistor is connected with the second end of the second capacitor, the second end of the second resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is grounded;
the comparison circuit comprises an operational amplifier and a third resistor, wherein the operational amplifier comprises a first input end, a second input end and an output end, the first input end of the operational amplifier is connected with the first end of the third capacitor, the second input end of the operational amplifier is connected with the second end of the second capacitor, the output end of the operational amplifier is connected with the first end of the third resistor, and the second end of the third resistor is the output end of the third interference signal.
10. A receiver, characterized in that,
comprises an antenna and a radio frequency signal processing device;
the antenna is used for receiving radio frequency signals;
the radio frequency signal processing device is connected with the antenna, the radio frequency signal processing device comprises an interference signal detection circuit, the interference signal detection circuit comprises an interference signal processing circuit and a processor, and the interference signal processing circuit is used for detecting a first interference signal in the radio frequency signal; carrying out attenuation/amplification/delay processing on the first interference signal to obtain a second interference signal; and comparing the first interference signal with the second interference signal to form a third interference signal corresponding to the first interference signal, wherein the third interference signal is a signal which can be detected and identified by a processor.
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