CN112821902B - Receiver, control method of receiver and mobile terminal - Google Patents
Receiver, control method of receiver and mobile terminal Download PDFInfo
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- CN112821902B CN112821902B CN201911128703.1A CN201911128703A CN112821902B CN 112821902 B CN112821902 B CN 112821902B CN 201911128703 A CN201911128703 A CN 201911128703A CN 112821902 B CN112821902 B CN 112821902B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a receiver, a control method of the receiver and a mobile terminal, wherein the receiver comprises a receiving antenna, a gain adjusting circuit, a frequency mixer and a processor; the output end of the receiving antenna is connected with the input end of the gain adjusting circuit and used for receiving the target frequency band signal and outputting the target frequency band signal to the gain adjusting circuit; the gain adjusting circuit comprises an attenuator and a low-noise amplifier which are connected with each other, the gain of at least one of the attenuator and the low-noise amplifier is adjustable, the input end of the attenuator is connected with the output end of the receiving antenna, and the output end of the low-noise amplifier is connected with the first input end of the mixer; the processor is connected with the attenuator and the low noise amplifier and used for calculating according to the target frequency band signal power to obtain a target gain value, generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit to adjust the gain value of the gain adjusting circuit, so that the anti-interference capability of the receiver can be improved.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a receiver, a control method of the receiver, and a mobile terminal.
Background
In intercom communication, a transmitter is used as a transmitting side and a receiver is used as a receiving side, and both the transmitter and the receiver have their rated operating frequency bands. Ideally, the frequency of the signal transmitted by the transmitter falls only within the nominal operating band, and the frequency of the signal of the receiver always falls within its operating band. However, in practical applications, when a large power is transmitted in a short distance, the interference of the beat interference and the like caused by the poor radiation blocking interference can interfere with the signal of the receiver, so that the communication quality of the interphone is poor, and a technical scheme capable of resisting interference is needed to provide good communication quality for the interphone.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a receiver, a control method of the receiver and a mobile terminal, which can improve the anti-interference capability of the receiver and further improve the communication quality.
In order to solve the technical problem, the application adopts a technical scheme that: providing a receiver, the receiver comprising: the device comprises a receiving antenna, a gain adjusting circuit, a mixer and a processor;
the output end of the receiving antenna is connected with the input end of the gain adjusting circuit and used for receiving a target frequency band signal and outputting the target frequency band signal to the gain adjusting circuit;
the gain adjusting circuit comprises an attenuator and a low noise amplifier which are connected with each other, the gain of at least one of the attenuator and the low noise amplifier is adjustable, the input end of the attenuator is connected with the output end of the receiving antenna, the output end of the attenuator is connected with the input end of the low noise amplifier, the output end of the low noise amplifier is connected with the first input end of the mixer, the attenuator is used for performing attenuation processing on the target frequency band signal under the control of the processor, and the low noise amplifier is used for performing amplification processing on the target frequency band signal output by the attenuator under the control of the processor;
the mixer is used for mixing the target frequency band signal output by the low noise amplifier to obtain a baseband signal with a preset frequency and outputting the baseband signal;
the processor is connected with the attenuator and the low noise amplifier, and is configured to calculate and obtain a target gain value according to the target frequency band signal power, generate a control instruction corresponding to the target gain value, and send the control instruction to the gain adjustment circuit to adjust the gain value of the gain adjustment circuit.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a control method of a receiver, the method being performed by a receiver including a gain adjustment circuit;
the method comprises the following steps:
acquiring the power of a target frequency band signal;
obtaining a target gain value of the gain adjusting circuit based on the power of the target frequency band signal;
and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value.
In order to solve the above technical problem, the present application adopts another technical solution: there is provided a mobile terminal, including a receiver and a transmitter, where the receiver is configured to receive a radio frequency signal in a preset frequency band and convert the radio frequency signal into a baseband signal, the receiver is the above-mentioned receiver, and the transmitter is configured to convert the baseband signal into a radio frequency signal and transmit the radio frequency signal.
Above scheme, through providing a receiver including receiving antenna, gain adjustment circuit, mixer and treater, gain adjustment circuit includes interconnect's attenuator and low noise amplifier, the treater is connected with attenuator and low noise amplifier, the treater can obtain the target gain value according to current target frequency channel signal power, and generate the control command of corresponding target gain value, and send gain adjustment circuit and can realize adjusting gain adjustment circuit's gain value according to the power of target frequency channel signal under in real time, the interference killing feature of receiver has been improved, and then avoid the influence of interference signal to communication quality, the anti-interference flexibility of receiver has also been improved, in order to improve communication quality.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a receiver according to the present application;
FIG. 2 is a block diagram of another embodiment of a receiver of the present application;
fig. 3 is a flowchart illustrating an embodiment of a method for controlling a receiver according to the present application;
FIG. 4 is a flow chart illustrating another embodiment of a method for controlling a receiver according to the present application;
fig. 5 is a flowchart illustrating a control method of a receiver according to another embodiment of the present application;
fig. 6 is a flowchart illustrating a control method of a receiver according to still another embodiment of the present disclosure;
fig. 7 is a flow chart of another embodiment of a control method of a receiver according to the present application;
fig. 8 is a schematic structural diagram of an embodiment of a mobile terminal according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a receiver according to an embodiment of the present application. In the present embodiment, the receiver 10 provided by the present application includes a receiving antenna 11, a gain adjustment circuit 12, a mixer 13, and a processor 14.
The output end of the receiving antenna 11 is connected to the input end of the gain adjusting circuit 12, and is configured to receive a target frequency band signal and output the target frequency band signal to the gain adjusting circuit 12, and the gain adjusting circuit 12 may adjust a gain value under the control of the processor 14, so as to improve the anti-interference capability of the receiver 10. In the present embodiment, the specific type of the receiving antenna 11 is not limited, and it is understood that in other embodiments, when the receiver 10 and the transmitter are simultaneously integrated in the same mobile terminal, the antenna for receiving in the receiver 10 may be simultaneously a transmitting antenna in the transmitter.
The gain adjustment circuit 12 includes an attenuator 121 and a low-noise amplifier 122 connected to each other, an input terminal of the attenuator 121 is connected to an output terminal of the receiving antenna 11, an output terminal of the attenuator 121 is connected to an input terminal of the low-noise amplifier 122, and an output terminal of the low-noise amplifier 122 is connected to a first input terminal a of the mixer 13. At least one of the attenuator 121 and the low noise amplifier 122 has an adjustable gain, and the attenuator 121 is configured to perform attenuation processing on the target frequency band signal under the control of the processor 14; when the gain of the low noise amplifier 122 is adjustable, the low noise amplifier 122 is used to perform amplification processing with different gains on the target frequency band signal output by the attenuator 121 under the control of the processor 14.
The mixer 13 is configured to perform mixing processing on the target frequency band signal output by the low noise amplifier 122 to obtain a baseband signal with a preset frequency and output the baseband signal. Further, in other embodiments, the second input terminal (not shown in fig. 1) of the mixer 13 is connected to the output terminal of the voltage controlled oscillator (not shown in fig. 1).
The processor 14 is connected to the output end of the gain adjusting circuit 12, and is configured to calculate a target gain value according to the target frequency band signal power, generate a control instruction corresponding to the target gain value, and send the control instruction to the gain adjusting circuit 12 to adjust the gain value of the gain adjusting circuit 12.
Further, the processor 14 is connected to the attenuator 121 and the low noise amplifier 122, respectively, and configured to generate a control instruction for adjusting the gain value according to the signal power of the target frequency band, and send the control instruction to the attenuator 121 or the low noise amplifier 122 to implement adjusting the gain value of the gain adjusting circuit 12. The processor 14, the attenuator 121 and the low noise amplifier 122 may be directly connected or indirectly connected, and the connection manner is not limited in this case.
It should be noted that, in order to clearly describe the functions of the improved part of the receiver 10 provided in the present application, in the course of describing the receiver 10 provided in the present application, the description of the structure that is not related to the improvement point of the technical solution of the present application is omitted.
The receiver 10 provided by the present application receives a target frequency band signal through the receiving antenna 11, and outputs the target frequency band signal to the attenuator 121 and the low noise amplifier 122 in the gain adjusting circuit 12, wherein the gain of at least one of the attenuator 121 and the low noise amplifier 122 in the receiver 10 provided by the present application can be controlled and adjusted by the processor 14, the processor 14 can generate a control instruction for adjusting the gain according to the power of the target frequency band signal and send the control instruction to the gain adjusting circuit 12, thereby realizing real-time adjustment of the gain value of the gain adjusting circuit 12 according to the power of the target frequency band signal, realizing improvement of the anti-interference capability of the receiver 10 in the working process, and further providing higher communication quality.
Further, with continued reference to FIG. 1, in another embodiment, the processor 14 includes a digital signal processor 141 and a reduced instruction processor 142 coupled to each other. The digital signal processor 141 is respectively connected with the attenuator 121 and the low noise amplifier 122, and is used for controlling the processing of the target frequency band signal by the attenuator 121 and/or the low noise amplifier 122; the risc 142 is connected to an adjustable gain amplifier (not shown in fig. 1), and the dsp 141 controls the risc 142. In the present embodiment, the digital signal processor 141 calculates a target gain value of the gain adjustment circuit 12 based on the signal strength that may interfere with the communication quality of the receiver 10, and then generates a control command corresponding to the target gain value and sends the control command to the gain adjustment circuit 12 to adjust the gain of the gain adjustment circuit 12, so that the gain adjustment circuit 12 processes the signal flowing through to increase the interference rejection capability of the receiver 10, thereby improving the communication quality of the receiver 10.
Further, the low noise amplifier 122 is an amplifier with adjustable gain. When the dsp 141 determines that the signal strength of the target frequency band is greater than or equal to the first preset threshold, the dsp 141 controls the attenuator 121 to perform an attenuation process on the signal of the target frequency band and/or reduces the gain of the gain adjustable low noise amplifier 122 to adjust the gain value of the gain adjusting circuit 12.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a receiver according to the present application. In the present embodiment, the gain adjustment circuit 22 in the receiver 20 further includes a radio frequency switch 223. The input end of the radio frequency switch 223 is connected to the output end of the receiving antenna 21 and the input end of the attenuator 221, and the control end B of the radio frequency switch 223 is connected to the digital signal processor 241, and is used for switching on or off the receiving antenna 21 and the attenuator 221 under the control of the digital signal processor 241.
In the present embodiment, the receiver 20 further comprises a first filter 25. The input end of the first filter 25 is connected to the output end of the receiving antenna 21, and the output end of the first filter 25 is connected to the input end of the rf switch 223, and is configured to perform filtering processing on the target frequency band signal output by the receiving antenna 21 to filter out unwanted signals.
With continued reference to fig. 2, the receiver 20 provided by the present application further includes a second filter 27, an analog-to-digital converter 28, and a third filter 29, and in the present embodiment, the gain adjustment circuit 22 further includes an adjustable gain amplifier 26. It should be noted that, in some embodiments, according to different control manners of each device in the gain adjustment circuit, the radio frequency switch 223, the attenuator 221, and the low noise amplifier 222 controlled by the digital Signal processor 241 are defined as a first gain adjustment circuit, and the first gain adjustment circuit can automatically control a gain according to an RSSI (Received Signal Strength Indication) threshold, so as to achieve the anti-strong Signal interference and the interference caused by the saturation of the useful Signal; the adjustable gain amplifier 26 controlled by the risc 242 is defined as a second gain adjusting circuit, which can control the gain adjustment according to the detection power of the internal chip, so that the useful baseband signal can be controlled below the full range, thereby avoiding the occurrence of demodulation error codes.
Further, in an embodiment, when a receiver (e.g., an intercom) receives a strong blocking interference signal level to cause a radio frequency link to be in a nonlinear region, and the low noise amplifier and the mixer cause low noise rise and spectrum spread due to nonlinear distortion and are higher than a demodulation threshold, so that the received signal cannot be demodulated to block the receiver, at this time, the digital signal processor 241 obtains a target gain value through calculation and controls the first gain adjusting circuit to adjust the gain, so that the blocking interference signal can be attenuated to be less than P-1dB of the low noise amplifier on the basis of ensuring the receiving sensitivity, the nonlinear distortion of the low noise amplifier and the mixer is eliminated, and further, the demodulation threshold of the receiver is ensured, so that the received signal demodulation is recovered to be normal, and the strong blocking signal interference resistance of the receiver is greatly improved. The receiver provided by the present application can also resist intermodulation interference or beat interference, other than the examples given in the current embodiment.
In another embodiment, when the receiver receives a strong blocking interference signal but the useful signal is smaller, the first gain adjustment circuit does not perform any operation, and only the second gain adjustment circuit can be regulated to control the useful baseband signal to be below the full range, so as to avoid the occurrence of demodulation error codes, ensure the demodulation threshold of the receiver, restore the demodulation of the received signal to normal, and greatly improve the strong blocking signal interference resistance when the receiver signal is smaller. In the same way, the receiver provided by the application can also resist intermodulation interference and beat interference, the communication quality is improved, and the application range of the receiver is also expanded.
The input terminal of the adjustable gain amplifier 26 is connected to the output terminal of the mixer 23, the output terminal of the adjustable gain amplifier 26 is connected to the input terminal of the second filter 27, and the control terminal of the adjustable gain amplifier 26 is connected to the risc processor 242, for adjusting the gain value of the adjustable gain amplifier 26 under the control of the risc processor 242 to adjust it to the corresponding gain value.
Further, the reduction processor 242 is configured to, when determining whether the power of the target frequency band signal is greater than a third preset threshold, when determining that the power of the target frequency band signal is greater than the third preset threshold, obtain a difference between the power of the target frequency band signal and the power of the reference signal and output the difference as a first adjustment value, further determine whether the first adjustment value is greater than the attenuation step value, and when the first adjustment value is greater than the attenuation step value, output the difference between the current gain value and the attenuation step value as the target gain value; otherwise, when the simplified instruction processor 242 determines that the first adjustment value is smaller than or equal to the attenuation step value, the difference between the current gain value and the first adjustment value is output as the target gain value, and after obtaining the target gain value, a control instruction corresponding to the target gain value is further generated and sent to the adjustable gain amplifier 26, so that the gain of the adjustable gain amplifier 26 is adjusted to the target gain value.
In another embodiment, when the risc processor 242 determines that the power of the target frequency band signal is smaller than or equal to the third preset threshold, it further determines whether the power of the target frequency band signal is smaller than the fourth preset threshold, if the power of the target frequency band signal is smaller than the fourth preset threshold, it calculates the difference between the power of the reference signal and the power of the target frequency band signal, and outputs the difference as the second adjustment value, after calculating the second adjustment value, it further determines whether the second adjustment value is larger than or equal to the attenuation step value, if it determines that the second adjustment value is larger than or equal to the attenuation step value, it outputs the sum of the current gain value and the attenuation step value as the target gain value, otherwise, when the second adjustment value is smaller than the attenuation step value, it outputs the sum of the current gain value and the second adjustment value as the target gain value, and finally, after calculating the target gain value, it generates a control command corresponding to the target gain value and sends the control command to the adjustable gain amplifier 26, so that the gain of adjustable gain amplifier 26 is adjusted to the target gain value.
The second filter 27 is configured to perform filtering processing on the baseband signal output by the mixer 23, and output the baseband signal obtained through the filtering processing to the analog-to-digital converter 28, where the analog-to-digital converter 28 converts the baseband signal into a digital signal and outputs the digital signal, and the third filter 29 performs filtering processing again on the received signal sent by the analog-to-digital converter 28 to obtain information corresponding to the signal received by the receiver 20.
Referring to fig. 3, fig. 3 is a flowchart illustrating a control method of a receiver according to an embodiment of the present disclosure. The main body of execution of the control method of the receiver illustrated in fig. 3 is the receiver corresponding to any one of the embodiments of fig. 1 or fig. 2 and the corresponding embodiments, that is, the receiver includes a gain adjustment circuit.
The method comprises the following steps:
s310: and acquiring the power of the target frequency band signal.
The target frequency band is obtained based on the parameters of the current receiver, and the target frequency band can be adjusted and set by a user as required. And acquiring the power of the target frequency band signal in the working process of the receiver. Specifically, the manner of obtaining the power of the target frequency band signal includes: after the power of the target frequency band signal is obtained through detection and the strength of the IQ signal is obtained, the power of the target frequency band signal is obtained through calculation based on the strength of the IQ signal, and a corresponding obtaining mode can be specifically selected according to requirements in different embodiments.
Further, in another embodiment, step S10 is preceded by: and waiting for a preset time to stabilize the target frequency band signal. Based on the characteristics of wireless signals, the signals have certain fluctuation, so that the preset time can be waited before the power of the target frequency band signals is obtained, the target frequency band signals are stable, and then the power of the more stable target frequency band signals can be obtained, so that the follow-up control on the interphone is more accurate. In the current embodiment, the length of the preset time required to wait may be set according to an empirical value, which is not limited herein.
S320: and calculating a target gain value of the gain adjusting circuit based on the power of the target frequency band signal.
And after the power of the target frequency band signal is obtained, a target gain value of the gain adjusting circuit is further obtained based on the power of the target skin-end signal. Wherein, in different embodiments, the gain adjustment circuit may comprise a first gain adjustment circuit and/or a second gain adjustment circuit. Correspondingly, the way of obtaining the target gain value of the gain adjustment circuit is determined based on the circuit configuration included in the gain adjustment circuit. Reference may be made in detail to the corresponding explanations in the different embodiments below.
S330: and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value.
According to the control method of the receiver, the power of the target frequency band signal is obtained, the target gain values of different gain adjusting circuits are obtained based on the power of the target frequency band signal, the control instruction corresponding to the target gain value is generated and sent to the gain adjusting circuit, so that the gain of the gain adjusting circuit is adjusted to the target gain value, the gain value of the gain adjusting circuit can be adjusted based on the current power of the receiver, the influence of external interference signals on the communication quality of the current receiver can be accurately reduced, the anti-interference capacity of the receiver is improved, and finally the communication quality of the receiver is improved.
In another embodiment, when the gain adjustment circuit includes a first gain adjustment circuit and a second gain adjustment circuit, the control method of the receiver provided in the present application may implement relatively independent control on the first gain adjustment circuit and the second gain adjustment circuit, that is, may implement adjustment by separately controlling the gain value of the first gain adjustment circuit or the second gain adjustment circuit. Further, please refer to fig. 4, wherein fig. 4 is a schematic flowchart of another embodiment of a control method of a receiver according to the present application. In the embodiment corresponding to fig. 4, a specific flow for individually controlling the first gain adjustment circuit is further illustrated. Specifically, in the present embodiment, the first gain adjustment circuit includes an attenuator and a low noise amplifier, and the control method of the receiver provided by the present application includes, for the first gain adjustment circuit:
s410: and acquiring IQ signal strength.
In the present embodiment, the IQ signal strength refers to the modulation signal strength in the receiver, and the IQ signal strength can be obtained by the digital signal processor.
S420: and calculating the power of the target frequency band signal according to the IQ signal strength. After the IQ signal strength is obtained, the power of the target frequency band signal can be calculated according to the IQ signal strength. Specifically, in the present embodiment, the conversion formula of the IQ signal strength and the target frequency band signal power can be obtained by using a commonly used conversion formula of the signal strength and the signal power Dbm, which is 10log (P), where Dbm represents the strength unit of the signal and P represents the signal power.
S430: and solving the strength of the target frequency band signal according to the power of the target frequency band signal.
In the present embodiment, the strength of the target band signal is obtained by using the power of the target band signal, specifically based on the formula Er ═ 10log (cdp) + Et. Where Er is the intensity of the target band signal obtained by external measurement, and may also be understood as the intensity of the useful signal, and Et is the external att (attributeprocol) attenuation. In various embodiments, when the first gain adjustment circuit does not attenuate the signal passing therethrough, the value of Et may be zero, otherwise Et is not zero, and the value of Et may be determined based on the state of the first gain adjustment circuit in the particular embodiment, as described below.
S440: and judging whether the intensity of the target frequency band signal is greater than or equal to a first preset threshold value.
The first preset threshold may be set according to an empirical value, and the first preset threshold is a set value for measuring the intensity of the external interference signal. If it is determined in step S440 that the strength of the target frequency band signal is greater than or equal to the first preset threshold, step S450 is executed, otherwise step S460 is executed.
S450: and outputting the first set value as a target gain value.
And if the intensity of the target frequency band signal is greater than or equal to a first preset threshold value, outputting a first set value as a target gain value. In the present embodiment, different states of different devices in the first gain adjustment circuit are set in advance to have a corresponding setting value, for example, the setting value corresponding to the on state of the attenuator is set to "1", the setting value corresponding to the off state of the attenuator is set to "0", the setting value corresponding to the on state of the low noise amplifier is set to "1", and the setting value corresponding to the off state of the low noise amplifier is set to "0". When the attenuator or the low noise amplifier is in an on state, the attenuator or the low noise amplifier attenuates or amplifies the flowing signal, and when the attenuator or the low noise amplifier is in an off state, the attenuator or the low noise amplifier does not attenuate or amplify the flowing signal. In the present embodiment, the first setting value is "11", which means that when the output target gain value is "11", it is necessary to turn on both the attenuator and the low noise amplifier to perform gain adjustment corresponding to the first setting value on the signal flowing through, so as to avoid the influence of the external interference signal on the communication quality of the receiver.
After the second setting value is outputted as the target gain value in step S450, step S480 is executed.
If the strength of the target frequency band signal is smaller than the first preset threshold, the method further includes steps S460 and S470:
s460: and judging whether the intensity of the target frequency band signal is less than or equal to a second preset threshold value.
And when the intensity of the target frequency band signal is smaller than a first preset threshold value, further judging whether the intensity of the target frequency band signal is smaller than or equal to a second preset threshold value, and if not, ending the current cycle. The second preset threshold is a set value which is set according to an empirical value and is used for measuring the strength of the external interference signal.
The first preset threshold is greater than the second preset threshold, and the first set value is smaller than the second set value. In an embodiment, the first preset threshold may be set to be-70 dBm, and the second preset threshold may be-95 dBm, so that the difference between the first preset threshold and the second preset threshold is-25 dBm, and a certain difference between the first preset threshold and the second threshold is set to be used as a guard interval, so as to avoid misjudgment and misoperation caused by the closeness of the first preset threshold and the second preset threshold, which further affects the communication quality of the receiver.
S470: and outputting the second set value as a target gain value.
And if the intensity of the target frequency band signal is judged to be small fish or equal to a second preset threshold value, outputting a second set value as a target gain value. The state of the device corresponding to the second setting value is different from the state of the device corresponding to the first setting value. In the present embodiment, the second setting value may be "00", that is, the states of the attenuator and the low noise amplifier corresponding to the second setting value are both the off states. When the attenuator or the low noise amplifier is in an off state, the corresponding attenuator or the low noise amplifier does not attenuate the signal flowing through the current device.
After outputting the second setting value as the target gain value, step S490 is executed.
S480: and generating a control instruction corresponding to the first set value and sending the control instruction to the first gain adjusting circuit so as to control the gain of the first gain adjusting circuit to be adjusted to the first set value, thereby realizing the gain adjustment of the target frequency band signal.
Correspondingly, after the target gain value is obtained as the first set value, the processor generates a control command corresponding to the first set value and sends the control command to the first gain adjustment circuit, so that the attenuator and the low noise amplifier are adjusted to be in an on state, and then attenuation or amplification processing is performed on a flowing signal, so that the influence of an external interference signal on the communication quality of the receiver is avoided, and the influence of the communication quality of the receiver is avoided.
S490: and generating a control instruction corresponding to the second set value and sending the control instruction to the first gain adjusting circuit so as to control the gain of the first gain adjusting circuit to be adjusted to the second set value, thereby realizing the gain adjustment of the target frequency band signal.
Correspondingly, after the target gain value is obtained to be the second set value, the processor generates a control command corresponding to the second set value and sends the control command to the first gain adjustment circuit, so that the attenuator and the low noise amplifier are adjusted to be in an inoperative state, and the signal is not subjected to gain adjustment, namely, the signal flowing through is not subjected to attenuation or amplification.
In the embodiment illustrated in fig. 4, the first set value is "11" and the second set value is "00". It is understood that in other embodiments, the first setting value or the second setting value can be set to other values according to actual needs, so as to perform other types of processing on the signal; if the third setting value is "01", the fourth setting value is "10" to indicate that the signal is subjected to gain adjustment of different values, and when the target gain value is the third setting value, the attenuator is in an on state and the low noise amplifier is in an off state; and when the target gain value is the fourth set value, the attenuator is in an off state, and the low noise amplifier is in an on state.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a control method of a receiver according to another embodiment of the present application. In the current embodiment, a flow diagram of a control method of a receiver provided by the present application when the gain adjustment circuit includes the second gain adjustment circuit is set forth. In the current embodiment, the method includes:
s501: and acquiring the power of the target frequency band signal.
In the present embodiment, when the second gain adjustment circuit is controlled, the power of the target frequency band signal is obtained based on the detection signal. Further, in an embodiment, the power of the useful target frequency band signal is obtained in step S501.
The step S502 to the step S506 of obtaining the target gain value of the gain adjusting circuit in the step S320 in the embodiment illustrated in fig. 3 are included.
S502: and judging whether the power of the target frequency band signal is greater than a third preset threshold value. Wherein the third preset threshold is an upper limit value preset according to an empirical value and used for representing an absolute value of the signal power change. Therefore, in step S502, it is determined whether the power of the current target frequency band signal is greater than the upper limit of the preset absolute value of the signal power variation.
S503: and calculating the difference value between the power of the target frequency band signal and the power of the reference signal, and outputting the difference value as a first adjusting value.
And if the power of the target frequency band signal is judged to be larger than the third preset threshold, the difference value between the power of the target frequency band signal and the power of the reference signal is obtained, and the difference value is output as a first adjusting value. The reference signal power is preset according to an empirical value, and is used for indicating that the target frequency band signal can provide better communication quality at the current power.
S504: it is determined whether the first adjustment value is greater than the attenuation step value. After the first adjustment value is obtained, it is further determined whether the first adjustment value is greater than an attenuation step value, wherein the attenuation step value is set according to a preset amount of signal attenuation each time, specifically according to a preset parameter of the receiver.
S505: and calculating the difference value between the current gain value and the attenuation stepping value, and outputting the difference value as a target gain value. And when the first adjusting value is judged to be larger than the attenuation stepping value, the difference value between the current gain value and the attenuation stepping value is obtained, and the obtained difference value is output as the target gain value.
S506: if not, the difference value between the current gain value and the first adjustment value is obtained, and the difference value is output as a target gain value. Otherwise, when the first adjustment value is smaller than or equal to the attenuation stepping value, the difference between the current gain value and the first adjustment value is obtained, and the difference is output as the target gain value.
S507: and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value. Specifically, after the target gain value is determined, a control command corresponding to the target gain value is further generated and sent to the second gain adjustment circuit, so that the second gain adjustment circuit responds to the control command.
Referring to fig. 6, fig. 6 is a flowchart illustrating a control method of a receiver according to another embodiment of the present application. Fig. 6 illustrates an embodiment when the power of the target frequency band signal determined in step S503 illustrated in fig. 5 is smaller than or equal to the third preset threshold.
S601: and judging whether the power of the target frequency band signal is smaller than a fourth preset threshold value.
And after the power of the target frequency band signal is judged to be less than or equal to the third preset threshold value, further judging whether the power of the target frequency band signal is less than a fourth preset threshold value.
S602: and calculating the difference value between the power of the reference signal and the power of the target frequency band signal, and outputting the difference value as a second adjusting value.
If the power of the target frequency band signal is smaller than the fourth preset threshold, the difference between the power of the reference signal and the power of the target frequency band signal is obtained, and the difference is output as a second adjustment value, and then step S603 is executed.
S603: it is determined whether the second adjustment value is greater than or equal to the attenuation step value.
If the second adjustment value is greater than or equal to the attenuation step value, step S604 is executed, otherwise, if the second adjustment value is smaller than the attenuation step value, step S605 is executed.
S604: and solving the sum of the current gain value and the attenuation stepping value, and outputting the sum as a target gain value.
S605: and the sum of the current gain value and the second adjustment value is obtained, and the sum is output as a target gain value.
S606: and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value.
In the present embodiment, a control instruction corresponding to the target gain value is generated and sent to the second gain adjustment circuit, so that the second gain adjustment circuit responds to the control instruction. It should be noted that, in the present embodiment, the digital processor may directly generate the control instruction corresponding to the target gain value and send the control instruction to the second gain adjustment circuit, or the reduced instruction processor connected to the digital processor may directly generate the control instruction corresponding to the target gain value and send the control instruction to the second gain adjustment circuit.
Referring to fig. 7, fig. 7 is a flowchart illustrating a control method of a receiver according to another embodiment of the present application. Specifically, fig. 7 sequentially shows a comparison diagram of frame time slots controlled by the first gain adjustment circuit and the second gain adjustment circuit, where the upper one is a frame time slot control block diagram of the first gain adjustment circuit, and the lower one is a frame time slot control block diagram of the second gain adjustment circuit. In fig. 7, ATT2 and ATT3 are used to respectively show the process of adjusting the gain of the attenuator and the low noise amplifier in the first gain adjusting circuit, ATT4 is used to show the process of adjusting the adjustable gain amplifier in the second gain adjusting circuit, and it can be known from fig. 7 that when a frame is 510 bits, the method for controlling the receiver provided by the present application only adjusts the gain of the first gain adjusting circuit once in a frame until the next frame arrives; for the second gain adjusting circuit, firstly, a frame is divided into N waiting time slots and N calculating time slots for adjusting the gain of the second gain adjusting circuit in advance according to a frame structure, in the working process of the receiver, a set time duration is wait in the waiting time slot (in fig. 7) to obtain a stable target frequency band signal power, then a target gain value corresponding to the second gain adjusting circuit is obtained by calculation in the calculating time slot, the gain value of the second gain adjusting circuit is correspondingly adjusted, and then the calculation is circularly waited for N times in sequence after the calculation for obtaining the current time slot is completed, so that the anti-interference of the receiver can be better and more accurately realized.
Please refer to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a mobile terminal according to the present application. In the current embodiment, the mobile terminal 80 includes a receiver 81 and a transmitter 82. The receiver 81 is configured to receive a radio frequency signal in a target frequency band and process and convert the radio frequency signal to obtain a baseband signal, the receiver 81 is the receiver shown in fig. 1 and fig. 2, and the transmitter 82 is configured to convert the baseband signal to a radio frequency signal and transmit the radio frequency signal. Further, the antenna of the receiver 81 and the antenna of the transmitter 82 may be integrated into one antenna, so that the receiver 81 may share one antenna when receiving a signal of a target frequency band and the transmitter 82 transmits a signal of a certain frequency band. It is understood that the mobile terminal provided in the present application does not limit the category of the shared devices on the premise of not affecting the performance of the mobile terminal.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A control method of a receiver, characterized in that the method is performed by the receiver including a gain adjustment circuit including a first gain adjustment circuit including an attenuator and a low noise amplifier;
the method comprises the following steps:
acquiring the power of a target frequency band signal;
obtaining the strength of the target frequency band signal according to the power of the target frequency band signal;
judging whether the intensity of the target frequency band signal is greater than or equal to a first preset threshold value or not;
if the strength of the target frequency band signal is greater than or equal to the first preset threshold, outputting a first set value as a target gain value to adjust the attenuator and the low noise amplifier to be in an on state;
and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value.
2. The method of claim 1, wherein the obtaining the power of the target frequency band signal comprises:
acquiring IQ signal intensity;
and calculating the power of the target frequency band signal according to the IQ signal strength.
3. The method of claim 2, further comprising:
if the intensity of the target frequency band signal is smaller than the first preset threshold, judging whether the intensity of the target frequency band signal is smaller than or equal to a second preset threshold;
if yes, outputting a second set value as the target gain value;
the first preset threshold is greater than the second preset threshold, and the first set value is smaller than the second set value.
4. The method of claim 3, wherein generating a control command corresponding to the target gain value and sending the control command to the gain adjustment circuit to enable the gain adjustment circuit to respond to the control command and further enable the gain of the gain adjustment circuit to be adjusted to the target gain value comprises:
and generating a control instruction corresponding to the first set value or the second set value and sending the control instruction to the first gain adjusting circuit so as to control the gain of the first gain adjusting circuit to be adjusted to the first set value or the second set value, thereby realizing the gain adjustment of the target frequency band signal.
5. A control method of a receiver, characterized in that the method is performed by the receiver including a gain adjustment circuit including a first gain adjustment circuit and a second gain adjustment circuit, and when the gain adjustment circuit is the second gain adjustment circuit, the method comprises:
acquiring IQ signal intensity;
calculating the power of the target frequency band signal according to the IQ signal strength;
judging whether the power of the target frequency band signal is greater than a third preset threshold value or not;
if so, calculating a difference value between the power of the target frequency band signal and the power of a reference signal, and outputting the difference value as a first adjusting value;
judging whether the first adjusting value is larger than an attenuation stepping value or not;
if so, calculating the difference value between the current gain value and the attenuation stepping value, and outputting the difference value as a target gain value; or
If not, the difference value between the current gain value and the first adjustment value is obtained, and the difference value is output as the target gain value;
and generating a control instruction corresponding to the target gain value and sending the control instruction to the gain adjusting circuit so that the gain adjusting circuit responds to the control instruction and the gain of the gain adjusting circuit is adjusted to the target gain value.
6. The method according to claim 5, wherein when the power of the target frequency band signal is less than or equal to the third preset threshold, the method further comprises:
judging whether the power of the target frequency band signal is smaller than a fourth preset threshold value or not; if so, calculating a difference value between the power of the reference signal and the power of the target frequency band signal, and outputting the difference value as a second adjustment value;
judging whether the second adjustment value is greater than or equal to the attenuation stepping value;
if so, calculating the sum of the current gain value and the attenuation stepping value, and outputting the sum as the target gain value; or
If not, the sum of the current gain value and the second adjustment value is obtained, and the sum is output as the target gain value.
7. A receiver, characterized in that the receiver comprises: the device comprises a receiving antenna, a gain adjusting circuit, a mixer and a processor;
the output end of the receiving antenna is connected with the input end of the gain adjusting circuit and used for receiving a target frequency band signal and outputting the target frequency band signal to the gain adjusting circuit;
the gain adjusting circuit comprises an attenuator and a low noise amplifier which are connected with each other, the gain of at least one of the attenuator and the low noise amplifier is adjustable, the input end of the attenuator is connected with the output end of the receiving antenna, the output end of the attenuator is connected with the input end of the low noise amplifier, the output end of the low noise amplifier is connected with the first input end of the mixer, the attenuator is used for performing attenuation processing on the target frequency band signal under the control of the processor, and the low noise amplifier is used for performing amplification processing on the target frequency band signal output by the attenuator under the control of the processor;
the mixer is used for mixing the target frequency band signal output by the low noise amplifier to obtain a baseband signal with a preset frequency and outputting the baseband signal;
the processor is connected with the attenuator and the low noise amplifier and used for solving the strength of the target frequency band signal according to the power of the target frequency band signal; judging whether the intensity of the target frequency band signal is greater than or equal to a first preset threshold value or not; if the strength of the target frequency band signal is greater than or equal to the first preset threshold, outputting a first set value as a target gain value to adjust the attenuator and the low noise amplifier to be in an on state, generating a control instruction corresponding to the target gain value, and sending the control instruction to the gain adjustment circuit to adjust the gain value of the gain adjustment circuit.
8. The receiver of claim 7, wherein the processor comprises a digital signal processor and a reduced instruction processor coupled to each other;
the low noise amplifier is a gain-adjustable low noise amplifier.
9. The receiver of claim 8, wherein the receiver further comprises a second filter, an analog-to-digital converter, and a third filter, and wherein the gain adjustment circuit further comprises an adjustable gain amplifier;
the input end of the adjustable gain amplifier is connected with the output end of the mixer, the output end of the adjustable gain amplifier is connected with the input end of the second filter, and the control end of the adjustable gain amplifier is connected with the simplified instruction processor and used for adjusting the gain value of the adjustable gain amplifier under the control of the simplified instruction processor so as to adjust the gain value of the gain adjusting circuit.
10. A mobile terminal, characterized in that the mobile terminal comprises a receiver and a transmitter, the receiver is used for receiving a radio frequency signal in a preset frequency band and converting the radio frequency signal into a baseband signal, the receiver is as claimed in any one of claims 7 to 9, and the transmitter is used for converting the baseband signal into the radio frequency signal and transmitting the radio frequency signal.
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| CN114915304B (en) * | 2022-03-28 | 2023-08-11 | 海能达通信股份有限公司 | Receiver, signal anti-interference circuit thereof and signal anti-interference method |
| CN114866116B (en) * | 2022-07-05 | 2022-09-27 | 深圳市汇顶科技股份有限公司 | Near field communication method and near field communication device |
| CN116419383B (en) * | 2023-06-06 | 2023-08-18 | 东方空间技术(北京)有限公司 | Automatic gain control method, circuit and equipment |
| CN116908886B (en) * | 2023-09-13 | 2023-12-26 | 北京凯芯微科技有限公司 | System and method for automatically detecting gain range of GNSS module |
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