CN114915304B - Receiver, signal anti-interference circuit thereof and signal anti-interference method - Google Patents
Receiver, signal anti-interference circuit thereof and signal anti-interference method Download PDFInfo
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- CN114915304B CN114915304B CN202210314617.5A CN202210314617A CN114915304B CN 114915304 B CN114915304 B CN 114915304B CN 202210314617 A CN202210314617 A CN 202210314617A CN 114915304 B CN114915304 B CN 114915304B
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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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 signal anti-interference circuit and a signal anti-interference method thereof, wherein the signal anti-interference circuit of the receiver comprises: the device comprises a signal power detection unit, a signal attenuation unit, a signal gain unit, a signal gating unit and a control unit; the control unit is respectively connected with the signal power detection unit and the signal gating unit and is used for: when the power value is smaller than a preset maximum normal working power value, the signal gating unit is controlled to gate the signal gain unit and the signal demodulation module; and when the power value is larger than the maximum normal working power value, controlling the signal gating unit to gate the signal attenuation unit and the signal demodulation module. The application can effectively improve the receiving capability and the anti-interference capability of the receiver on signals in a weak signal environment.
Description
Technical Field
The present application relates to the field of receiver technologies, and in particular, to a receiver, a signal anti-interference circuit thereof, and a signal anti-interference method thereof.
Background
The zero intermediate frequency receiver is a receiver capable of directly converting a received signal into an original transmission signal without passing through an intermediate frequency. The zero intermediate frequency receiver has the advantages of simple structure, small volume, high integration level, low cost and the like, has great advantages in the aspects of miniaturization and low cost of the handheld terminal, and gradually replaces the superheterodyne receiver.
The existing zero intermediate frequency receiver is polluted by various noise signals, particularly when the zero intermediate frequency receiver receives weak signals (particularly, the intensity of the weak signals is close to the receiving sensitivity), the zero intermediate frequency receiver is easy to be interfered by the noise signals, and the receiving sensitivity of the zero intermediate frequency receiver is low, so that the zero intermediate frequency receiver cannot normally receive signals, and the anti-interference capability of the zero intermediate frequency receiver on the signal is poor.
Disclosure of Invention
The embodiment of the application provides a receiver, a signal anti-interference circuit and a signal anti-interference method thereof, which can effectively improve the receiving capacity and the anti-interference capacity of the receiver on signals in a weak signal environment.
An embodiment of the present application provides a signal anti-interference circuit of a receiver, which includes:
a signal power detection unit, configured to detect a power value of a signal received by the receiver;
a signal attenuation unit, configured to attenuate a signal received by the receiver;
a signal gain unit, configured to amplify a signal received by the receiver;
a signal gating unit respectively connected with the signal attenuation unit and the signal gain unit and used for gating one of the signal attenuation unit and the signal gain unit with a signal demodulation module of the receiver;
the control unit is respectively connected with the signal power detection unit and the signal gating unit and is used for:
when the power value is smaller than a preset maximum normal working power value, the signal gating unit is controlled to gate the signal gain unit and the signal demodulation module;
and when the power value is larger than the maximum normal working power value, controlling the signal gating unit to gate the signal attenuation unit and the signal demodulation module.
As an improvement of the above solution, the control unit is further connected to the signal gain unit, and the control unit is further configured to:
and determining a corresponding signal gain value for the signal gain unit based on the power value, so that the signal gain unit amplifies the signal according to the signal gain value.
As an improvement of the above-described scheme, the signal gain value and the power value satisfy the following relationship:
if the power value is smaller than the maximum normal working power value and not smaller than the first power value, the signal gain value is correspondingly set as a first gain value;
and if the power value is smaller than the first power value, the signal gain value is correspondingly set to be a second gain value, wherein the second gain value is larger than the first gain value.
As an improvement of the above solution, if the power value is smaller than a second power value, the signal gain value is correspondingly set to a third gain value, where the second power value is smaller than the first power value, and the third gain value is larger than the second gain value.
As an improvement of the above solution, if the power value is smaller than a third power value, the signal gain value is correspondingly set to a fourth gain value, where the third power value is smaller than the second power value, and the fourth gain value is greater than the third gain value.
As an improvement of the above solution, the control unit is further connected to the signal attenuation unit, and the control unit is further configured to:
and setting a corresponding signal attenuation value for the signal attenuation unit based on the power value, so that the signal attenuation unit attenuates the signal according to the signal attenuation value.
As an improvement of the above-described scheme, the signal attenuation value and the power value satisfy the following relationship:
if the power value is greater than or equal to the maximum normal working power value and is smaller than a fourth power value, the signal attenuation value is correspondingly set as a first attenuation value;
and if the power value is greater than or equal to the fourth power value, the signal attenuation value is correspondingly set to be a second attenuation value, wherein the second attenuation value is smaller than the first attenuation value.
As an improvement of the above solution, if the power value is greater than or equal to a fifth power value, the signal attenuation value is correspondingly set to a third attenuation value, where the fifth power value is greater than the fourth power value, and the third attenuation value is less than the second attenuation value.
As an improvement of the above solution, if the power value is greater than or equal to a sixth power value, the signal attenuation value is set to a fourth attenuation value, where the sixth power value is greater than the fifth power value, and the fourth attenuation value is less than the third attenuation value.
Another embodiment of the present application provides a receiver, comprising: the signal demodulation module and the signal anti-interference circuit of the receiver according to any of the above embodiments;
the signal demodulation module is respectively connected with the signal gating unit and the control unit, and the signal gating unit is used for gating the signal demodulation module with one of the signal attenuation unit and the signal gain unit.
Another embodiment of the present application provides a signal anti-interference method of a receiver, which is applied to the control unit of the signal anti-interference circuit of the receiver in any one of the foregoing embodiments, where the signal anti-interference method includes:
the signal power detection unit detects the power value of a signal received by the receiver;
the control unit compares the power value with a preset maximum normal working power value, controls the signal gating unit to gate the signal gain unit and the signal demodulation module of the receiver when the power value is smaller than the preset maximum normal working power value, and controls the signal attenuation unit to gate the signal demodulation module when the power value is larger than the maximum normal working power value.
One of the above embodiments has at least one of the following advantages over the prior art:
the signal power detection unit detects the power value of the signal in real time in the process of receiving the signal by the receiver by arranging the signal power detection unit, the signal attenuation unit, the signal gain unit and the signal gating unit; if the control unit judges that the power value is smaller than the preset maximum normal working power value, the control unit indicates that the currently received signal has smaller interference intensity, and then controls the signal gating unit to gate the signal gain unit and the signal demodulation module, and the signal gain unit amplifies the signal, so that the receiving capacity of the signal (especially weak signal) is enhanced under the condition that the signal has smaller interference; if the control unit judges that the power value is smaller than the preset maximum normal working power value, the control unit indicates that the currently received signal has larger interference intensity, and then controls the signal gating unit to gate the signal attenuation unit and the signal demodulation module, and the signal attenuation unit attenuates the signal so as to improve the interference resistance of the receiver on the signal reception. From the above analysis, the embodiment of the application can effectively improve the receiving capability and anti-interference capability of the receiver on the signal in the weak signal environment.
Drawings
Fig. 1 is a schematic diagram of a signal anti-interference circuit of a receiver according to an embodiment of the present application;
fig. 2 is a schematic diagram of a signal anti-interference circuit of another receiver according to an embodiment of the present application;
fig. 3 is a schematic diagram of a signal anti-interference circuit of another receiver according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a receiver according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another receiver according to an embodiment of the present application;
fig. 6 is a flowchart of a signal anti-interference method of a receiver according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first," "second," and the like in this disclosure are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, a schematic diagram of a signal anti-interference circuit of a receiver according to an embodiment of the present application is shown. A signal immunity circuit of a receiver, comprising: a signal power detecting unit 10, a signal attenuating unit 11, a signal gain unit 12, a signal gating unit 13, and a control unit 14; a signal power detection unit 10, the detection end of which is used for detecting the power value of the signal received by the receiver; a signal attenuation unit 11, whose signal input end is used for attenuating the signal received by the receiver; a signal gain unit 12, the signal input end of which is used for amplifying the signal received by the receiver; a signal gating unit 13 connected to the signal attenuating unit 11 and the signal gain unit 12, respectively, for gating one of the signal attenuating unit 11 and the signal gain unit 12 with a signal demodulation module 15 of the receiver; the control unit 14, the signal acquisition end of which is connected with the power detection feedback end of the signal power detection unit 10, the first control end of which is connected with the controlled end of the signal gating unit 13, is used for:
when the power value is smaller than the preset maximum normal working power value, the signal gating unit 13 is controlled to gate the signal gain unit 12 and the signal demodulation module 15;
when the power value is larger than the maximum normal operation power value, the signal gating unit 13 is controlled to gate the signal attenuation unit 11 and the signal demodulation module 15.
The working principle of the signal anti-interference circuit of the receiver of the embodiment of the application is as follows: during the process of receiving signals by the receiver, the signal power detection unit 10 detects the power value of the signals received by the receiver in real time, and sends the detected power value to the control unit 14; if the control unit 14 determines that the power value is smaller than the preset maximum normal working power value, which indicates that the currently received signal has smaller interference intensity, the control unit 14 controls the signal gating unit 13 to gate the signal gain unit 12 and the signal demodulation module 15, and the signal gain unit 12 amplifies the signal, so that the receiving capability of the signal (especially weak signal) is enhanced under the condition that the signal has smaller interference; if the control unit 14 determines that the power value is smaller than the preset maximum normal working power value, which indicates that the currently received signal has a high interference intensity, the control unit 14 controls the signal gating unit 13 to gate the signal attenuation unit 11 and the signal demodulation module 15, and the signal attenuation unit 11 attenuates the signal, so as to improve the anti-interference capability of the receiver on the signal reception. It will be appreciated that the maximum normal operating power value may refer to: the receiver is able to receive the maximum power value of the signal in case of normal reception of the signal. If the power value of the signal received by the receiver exceeds the maximum normal working power value, the strength of interference to the signal exceeds the allowable rated value, so that the receiver cannot normally receive the signal.
In summary, the embodiment of the application can effectively improve the receiving capability and the anti-interference capability of the receiver on signals in a weak signal environment. It should be noted that the embodiments of the present application may also be used in signal receiving situations in other signal environments (such as environments with high signal strength), and are not limited herein. It will be appreciated that the receiver may be a zero intermediate frequency receiver, a superheterodyne receiver, or the like, and is not specifically limited herein.
It is to be understood that the circuit structures of the signal power detecting unit 10, the signal attenuating unit 11, the signal gain unit 12 and the signal gating unit 13 may refer to the prior art, and are not described and limited herein. Furthermore, the control unit 14 may be a microcontroller of the receiver (in particular a microcontroller in the signal demodulator 1 of the receiver).
Referring to fig. 2, which is a schematic structural diagram of a signal anti-interference circuit of a receiver according to another embodiment of the present application, the control unit 14 is further connected to the signal gain unit 12, and the control unit 14 is further configured to: determining a corresponding signal gain value for the signal gain unit 12 based on the power value, such that the signal gain unit 12 amplifies a signal received by the receiver according to the signal gain value; wherein the power value is inversely proportional to the magnitude of both signal gain values, i.e. the larger the power value the smaller the signal gain value.
In this embodiment, in the case where the power value is smaller than the preset maximum normal operation power value, the signal gain value is set based on the power value: on the one hand, the larger the power value is, the smaller the signal gain value is set, and the larger the power value is, the higher the strength of the signal at the moment is, and the stronger the receiving capability of the receiver on the signal at the moment is, so that the signal gain value can be correspondingly set smaller, the receiving capability of the receiver on the signal can be improved, and the noise of the signal after gain can be prevented from being too strong; on the other hand, the smaller the power value is, the larger the signal gain value is set, and the smaller the power value is, the smaller the signal strength is, and the weaker the receiving capability of the receiver on the signal is, so that the signal gain value can be correspondingly set to be larger, the receiving capability of the receiver on the signal can be improved, and the noise carried by the amplified signal is relatively not too strong due to the weaker signal strength of the signal. Wherein, when the power value of the signal received by the receiver is equal to or very close to the receiving sensitivity of the receiver, the signal gain value can be set as the rated maximum gain value of the receiver.
As one example, the signal gain value and the power value satisfy the following relationship:
if the power value is smaller than the maximum normal working power value and not smaller than the first power value, the signal gain value is correspondingly set as a first gain value;
if the power value is smaller than the first power value, the signal gain value is correspondingly set to be a second gain value, wherein the second gain value is larger than the first gain value.
As another example, further, if the power value is smaller than the second power value, the signal gain value is correspondingly set to a third gain value, where the second power value is smaller than the first power value, and the third gain value is greater than the second gain value.
As yet another example, further, if the power value is less than the third power value, the signal gain value is correspondingly set to a fourth gain value, wherein the third power value is less than the second power value, and the fourth gain value is greater than the third gain value.
For ease of understanding, the following relationship is satisfied for signal gain values and power values, see table 1 for illustration herein: if the power value is smaller than XdBm and larger than or equal to (X-Y) dBm, the signal gain value is correspondingly set as WdB;
if the power value is smaller than (X-Y) dBm, the signal gain value is correspondingly set as (W+T) dB;
further, if the power value is smaller than (X-2Y) dBm, the signal gain value is correspondingly set to (w+2t) dB, that is, only when the power value is smaller than (X-2Y) dBm, the signal gain value is correspondingly set to (w+2t) dB, and when the power value is larger than or equal to (X-2Y) dBm and smaller than (X-Y) dBm, the signal gain value is still set to (w+t) dB;
further, if the power value is less than (X-3Y) dBm, the signal gain value is correspondingly set to (W+3T) dB, namely, only when the power value is less than (X-3Y) dBm, the signal gain value is correspondingly set to (W+3T) dB, and when the power value is greater than or equal to (X-3Y) dBm and less than (X-2Y) dBm, the signal gain value is still set to (W+2T) dB;
wherein X is the maximum normal working power value, Y is the preset power regulating value; w is the minimum normal working gain value, and T is the preset gain adjustment value.
TABLE 1 correspondence table of signal gain value Z and power value P of signal received by receiver
In this embodiment, by setting the signal gain value to 4 different values correspondingly based on the power value, fine control of the signal gain can be achieved according to the interference strength of the signal, so that the receiving capability of the receiver for weak signals can be improved better according to the power value of the signal.
By way of example, X is from-20 to 0, Y is from 5 to 10, W is from 0 to 10, and T is from 1 to 10.
Referring to fig. 3, which is a schematic structural diagram of a signal anti-interference circuit of a receiver according to another embodiment of the present application, the control unit is further connected to the signal attenuation unit 11, and the control unit 14 is further configured to: setting a corresponding signal attenuation value for the signal attenuation unit 11 based on the power value, so that the signal attenuation unit 11 attenuates the signal according to the signal attenuation value; the power value is proportional to the magnitude of both signal attenuation values, i.e. the larger the power value the more the signal is attenuated and the larger the signal attenuation value, where the signal attenuation value only takes into account the magnitude of the absolute value when comparing the magnitude, irrespective of the influence of the symbol.
In this embodiment, in the case where the power value is greater than the preset maximum normal operation power value, the signal attenuation value is set based on the power value: on the one hand, the larger the power value is, the larger the signal attenuation value is set, and the larger the power value is, the larger the interference intensity of the signal at the moment is, so that the signal attenuation value can be correspondingly set to be larger, and the anti-interference capability of the receiver on the signal receiving can be better improved; on the other hand, the smaller the power value is, the smaller the signal attenuation value is, and the smaller the power value is, the smaller the interference intensity of the signal at the moment is, so that the signal attenuation value can be correspondingly set smaller, the receiving capacity of the receiver on the signal can be ensured, and the anti-interference capacity of the receiver on the signal can be effectively improved.
As one example, the signal attenuation value and the power value satisfy the following relationship:
if the power value is larger than or equal to the maximum normal working power value and smaller than the fourth power value, the signal attenuation value is correspondingly set as a first attenuation value;
if the power value is greater than or equal to the fourth power value, the signal attenuation value is correspondingly set to a second attenuation value, wherein the second attenuation value is smaller than the first attenuation value.
As another example, further, if the power value is greater than or equal to the fifth power value, the signal attenuation value is correspondingly set to the third attenuation value, wherein the fifth power value is greater than the fourth power value, and the third attenuation value is less than the second attenuation value.
As yet another example, further, if the power value is greater than or equal to the sixth power value, the signal attenuation value is correspondingly set to a fourth attenuation value, wherein the sixth power value is greater than the fifth power value, and the fourth attenuation value is less than the third attenuation value.
For ease of understanding, the following relationship is satisfied by the signal attenuation values and power values, see table 2 for illustration herein:
if the power value is greater than or equal to XdBm and less than (X+Y) dBm, the signal attenuation value is set as SdB correspondingly;
if the power value is greater than or equal to (X+Y) dBm, the signal attenuation value is correspondingly set as (S-A) dB;
further, if the power value is greater than or equal to (x+2y) dBm, the signal attenuation value is correspondingly set to (S-2A) dB, that is, only when the power value is greater than or equal to (x+2y) dBm, the signal attenuation value is correspondingly set to (S-2A) dB, and when the power value is greater than or equal to (x+y) dBm and less than (x+2y) dBm, the signal attenuation value is still set to (S-se:Sup>A) dB;
further, if the power value is greater than or equal to (x+3y) dBm, the signal attenuation value is correspondingly set to (S-3A) dB, that is, only when the power value is greater than or equal to (x+3y) dBm, the signal attenuation value is correspondingly set to (S-3A) dB, and when the power value is greater than or equal to (x+2y) dBm and less than (x+3y) dBm, the signal attenuation value is still set to (S-2A) dB;
wherein X is the maximum normal working power value, Y is the preset power regulating value; s is the minimum normal operation attenuation value, and T is the preset attenuation adjustment value.
TABLE 2 correspondence between signal attenuation value J and power value P of signal received by receiver
In this embodiment, the signal attenuation values are set to 4 different values correspondingly based on the power values, so that fine control of signal attenuation can be achieved according to the interference strength of the signal, and thus the anti-interference capability of the receiver on signal reception can be better improved, and especially the anti-interference capability of the receiver on the signal in a weak signal environment can be improved.
By way of example, X is from-20 to 0, Y is from 5 to 10, S is from-10 to 0, and A is from 1 to 10.
In summary, the above embodiments are combined, and the receiver according to the embodiment of the present application after combination is compared with the existing conventional receiver to obtain the test comparison results shown in table 3 and table 4:
TABLE 3 terminal anti-interference performance improvement verification result
TABLE 4 terminal limit receiving sensitivity improvement verification results
| Test frequency point (hertz) | Prior Art | Embodiments of the application | Improvement amount |
| 350M | -124.1dBm | -125.6dBm | 1.5dB |
| 410M | -124.3dBm | -125.7dBm | 1.4dB |
| 470M | -124.0dBm | -125.5dBm | 1.5dB |
As shown in table 3, by applying the signal anti-interference circuit of the receiver according to the embodiment of the application, the anti-interference performance of the receiver in the weak signal environment can be improved by about 2 m. As can be seen from table 4, by applying the signal anti-interference circuit of the receiver according to the embodiment of the application, the sensitivity of signal reception of the receiver can be improved by about 1.5 dB. In summary, the embodiment of the application not only improves the anti-interference performance in the weak signal environment, but also improves the sensitivity of signal reception of the receiver.
Referring to fig. 4, a schematic structure of a receiver according to an embodiment of the present application is shown. The receiver comprises a demodulator 1, the demodulator 1 comprising: the signal demodulation module 15 and the signal anti-interference circuit of the receiver according to any of the above embodiments. In fig. 4, the structure of the signal anti-interference circuit in the further embodiment of the present application is further provided, and the control unit 14 is respectively connected to the signal attenuation unit 11, the signal gain unit 12, and the signal gating unit 13, and the specific working principle can be referred to the foregoing description, which is not repeated here. It should be noted that fig. 4 is only shown as an example, and is not intended to limit the structure of the signal anti-interference circuit in the receiver to the structure shown in fig. 4, and the structure of the signal anti-interference circuit in the receiver may be the structure in any of the foregoing embodiments.
Referring again to fig. 4, the signal demodulation module 15 is respectively connected to the signal gating unit 13 and the control unit 14, and the signal gating unit 13 is used for gating the signal demodulation module 15 with one of the signal attenuation unit 11 and the signal gain unit 12.
In this embodiment, the demodulator 1 of the receiver can effectively improve the signal receiving capability and the anti-interference capability of the receiver in a weak signal environment by applying the signal anti-interference circuit of the receiver in the above embodiment. In addition, by integrating the signal power detecting unit 10, the signal attenuating unit 11, the signal gain unit 12 and the signal gating unit 13 together with the signal demodulating module 15 into the demodulator 1 of the receiver, compared with the case that these devices are separately arranged, the hardware cost of the demodulator 1 of the receiver can be reduced, and the circuit board area occupied by these devices can be saved.
It is to be understood that the specific circuit structure of the signal demodulation module 15 may refer to the prior art, and is not described and limited herein. As an example, referring to fig. 4, the signal demodulation module 15 includes a low pass filter 150, a mixer 151, and an IQ modulator 152; the input end of the low-pass filter 150 is connected to the signal output end of the signal gating unit 13, the output end of the low-pass filter 150 is connected to the input end of the mixer 151, the output end of the mixer 151 is connected to the input end of the IQ modulator 152, and the controlled end of the IQ modulator 152 is connected to the control end of the control unit 14.
As an example, referring to fig. 5, the receiver further comprises a signal receiving module 16 for receiving a signal, the signal receiving module 16 comprising a receiving antenna 160 and a band pass filter 161; an input end of the band-pass filter 161 is connected to the receiving antenna 160, and an output end of the band-pass filter 161 is connected to the signal power detecting unit 10, the signal attenuating unit 11, and the signal gain unit 12.
It will be appreciated that the receiver may be a zero intermediate frequency receiver, a superheterodyne receiver, or the like, and is not specifically limited herein.
Fig. 6 is a flowchart of a signal anti-interference method of a receiver according to an embodiment of the present application. The signal anti-interference method of the receiver is applied to the signal anti-interference circuit of the receiver in any of the above embodiments, and includes steps S10 to S11:
s10, a signal power detection unit 10 detects a power value of a signal received by a receiver;
s11, the control unit 14 compares the power value with a preset maximum normal operation power value, and controls the signal gating unit 13 to gate the signal gain unit 12 and the signal demodulation module 15 of the receiver when the power value is smaller than the preset maximum normal operation power value, and controls the signal gating unit 13 to gate the signal attenuation unit 11 and the signal demodulation module 15 when the power value is larger than the maximum normal operation power value.
In the embodiment of the application, in the process of receiving signals by a receiver, the power value of the signals is detected in real time by a signal power detection unit 10; if the control unit 14 determines that the power value is smaller than the preset maximum normal working power value, which indicates that the currently received signal has smaller interference intensity, the control unit 14 controls the signal gating unit 13 to gate the signal gain unit 12 and the signal demodulation module 15, and the signal gain unit 12 amplifies the signal, so that the receiving capability of the signal (especially weak signal) is enhanced under the condition that the signal has smaller interference; if the control unit 14 determines that the power value is smaller than the preset maximum normal working power value, which indicates that the currently received signal has a high interference intensity, the control unit 14 controls the signal gating unit 13 to gate the signal attenuation unit 11 and the signal demodulation module 15, and the signal attenuation unit 11 attenuates the signal, so as to improve the anti-interference capability of the receiver on the signal reception. From the above analysis, the embodiment of the application can effectively improve the receiving capability and anti-interference capability of the receiver on the signal in the weak signal environment.
In one embodiment, the control unit 14 controls the signal gating unit 13 to gate the signal gain unit 12 and the signal demodulation module 15 of the receiver, including:
determining a corresponding signal gain value for the signal gain unit 12 based on the power value and controlling the signal gating unit 13 to gate the signal gain unit 12 and the signal demodulation module 15 of the receiver so that the signal gain unit 12 gains the signal according to the signal gain value; the power value is inversely proportional to the magnitude of the absolute value of both signal gain values.
In this embodiment, in the case where the power value is smaller than the preset maximum normal operation power value, the signal gain value is set based on the power value: on the one hand, the larger the power value is, the smaller the signal gain value is set, and the larger the power value is, the higher the strength of the signal at the moment is, and the stronger the receiving capability of the receiver on the signal at the moment is, so that the signal gain value can be correspondingly set smaller, the receiving capability of the receiver on the signal can be improved, and the noise of the signal after gain can be prevented from being too strong; on the other hand, the smaller the power value is, the larger the signal gain value is set, and the smaller the power value is, the smaller the signal strength is, and the weaker the receiving capability of the receiver on the signal is, so that the signal gain value can be correspondingly set to be larger, the receiving capability of the receiver on the signal can be improved, and the noise carried by the signal after gain is relatively not too strong due to the weaker signal strength of the signal. When the power value of the signal received by the receiver is equal to or very close to the receiving sensitivity of the receiver, the signal gain value can be set as the rated maximum gain value of the receiver.
In one embodiment, the control unit 14 controls the signal gating unit 13 to gate the signal attenuating unit 11 and the signal demodulating module 15, including:
setting a corresponding signal attenuation value for the signal attenuation unit 11 based on the power value and controlling the signal gating unit 13 to gate the signal attenuation unit 11 and the signal demodulation module 15 so that the signal attenuation unit 11 attenuates the signal according to the signal attenuation value; the power value is proportional to the absolute value of both signal attenuation values.
In this embodiment, in the case where the power value is greater than a preset maximum normal operation power value, a signal gain value is set based on the power value: on the one hand, the larger the power value is, the larger the signal attenuation value is set, and the larger the power value is, the larger the interference intensity of the signal is relatively, so that the signal attenuation value can be correspondingly set to be larger, and the anti-interference capability of the receiver on the signal can be better improved; on the other hand, the smaller the power value is, the smaller the signal attenuation value is set, and the smaller the power value is, the smaller the interference intensity of the signal at the moment is, so that the signal attenuation value can be correspondingly set smaller, the receiving capacity of the receiver on the signal is ensured, and meanwhile, the anti-interference capacity of the receiver on the signal can be effectively improved.
It should be noted that, the scheme content of the signal anti-interference method embodiment of the receiver may also correspond to the related scheme content of the signal anti-interference circuit embodiment of the receiver, which is not described herein.
It should be noted that the circuit embodiments described above are merely illustrative, and in addition, in the circuit embodiment drawings provided by the present application, the connection relationship between the modules indicates that there are communication connections therebetween, and may be implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present application without undue burden.
While the foregoing is directed to the preferred embodiments of the present application, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, such changes and modifications are also intended to be within the scope of the application.
Claims (9)
1. A signal anti-interference circuit for a receiver, comprising:
a signal power detection unit, configured to detect a power value of a signal received by the receiver;
a signal attenuation unit, configured to attenuate a signal received by the receiver;
a signal gain unit, configured to amplify a signal received by the receiver;
a signal gating unit respectively connected with the signal attenuation unit and the signal gain unit and used for gating one of the signal attenuation unit and the signal gain unit with a signal demodulation module of the receiver;
the control unit is respectively connected with the signal power detection unit, the signal gating unit, the signal gain unit and the signal attenuation unit and is used for:
when the power value is smaller than a preset maximum normal working power value, the signal gating unit is controlled to gate the signal gain unit and a signal demodulation module of the receiver, and a corresponding signal gain value is determined for the signal gain unit based on the power value, so that the signal gain unit amplifies the signal according to the signal gain value;
and when the power value is larger than the maximum normal working power value, controlling the signal gating unit to gate the signal attenuation unit and a signal demodulation module of the receiver, and setting a corresponding signal attenuation value for the signal attenuation unit based on the power value so that the signal attenuation unit attenuates the signal according to the signal attenuation value.
2. The signal-to-interference circuit of claim 1 wherein the signal gain value and the power value satisfy the relationship:
if the power value is smaller than the maximum normal working power value and not smaller than the first power value, the signal gain value is correspondingly set as a first gain value;
and if the power value is smaller than the first power value, the signal gain value is correspondingly set to be a second gain value, wherein the second gain value is larger than the first gain value.
3. The signal-to-interference circuit of claim 2 wherein the signal gain value is correspondingly set to a third gain value if the power value is less than a second power value, wherein the second power value is less than the first power value and the third gain value is greater than the second gain value.
4. The signal-to-interference circuit of claim 3 wherein the signal gain value is correspondingly set to a fourth gain value if the power value is less than a third power value, wherein the third power value is less than the second power value and the fourth gain value is greater than the third gain value.
5. The signal immunity circuit of claim 1, wherein the signal attenuation value and the power value satisfy the following relationship:
if the power value is greater than or equal to the maximum normal working power value and is smaller than a fourth power value, the signal attenuation value is correspondingly set as a first attenuation value;
and if the power value is greater than or equal to the fourth power value, the signal attenuation value is correspondingly set to be a second attenuation value, wherein the second attenuation value is smaller than the first attenuation value.
6. The signal immunity circuit of claim 5, wherein if the power value is greater than or equal to a fifth power value, the signal attenuation value is correspondingly set to a third attenuation value, wherein the fifth power value is greater than the fourth power value, and the third attenuation value is less than the second attenuation value.
7. The signal immunity circuit of claim 6, wherein if the power value is greater than or equal to a sixth power value, the signal attenuation value is correspondingly set to a fourth attenuation value, wherein the sixth power value is greater than the fifth power value, and the fourth attenuation value is less than the third attenuation value.
8. A receiver, comprising: a signal demodulation module and a signal anti-interference circuit according to any one of claims 1 to 7;
the signal demodulation module is respectively connected with the signal gating unit and the control unit, and the signal gating unit is used for gating the signal demodulation module with one of the signal attenuation unit and the signal gain unit.
9. A signal anti-interference method of a receiver, applied to the signal anti-interference circuit of any one of claims 1-7, comprising:
the signal power detection unit detects the power value of a signal received by the receiver;
the control unit compares the power value with a preset maximum normal working power value, controls the signal gating unit to gate the signal gain unit and a signal demodulation module of the receiver when the power value is smaller than the preset maximum normal working power value, and determines a corresponding signal gain value for the signal gain unit based on the power value;
the signal gain unit amplifies the signal according to the signal gain value;
or when the power value is larger than the maximum normal working power value, the control unit controls the signal gating unit to gate the signal attenuation unit and the signal demodulation module, and sets a corresponding signal attenuation value for the signal attenuation unit based on the power value;
the signal attenuation unit attenuates the signal according to the signal attenuation value.
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