CN113131952A - Blocking signal suppression method, signal demodulation method, device and related equipment - Google Patents
Blocking signal suppression method, signal demodulation method, device and related equipment Download PDFInfo
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- CN113131952A CN113131952A CN201911421716.8A CN201911421716A CN113131952A CN 113131952 A CN113131952 A CN 113131952A CN 201911421716 A CN201911421716 A CN 201911421716A CN 113131952 A CN113131952 A CN 113131952A
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
Abstract
The application provides a blocking signal suppression method, a signal demodulation method, a device and related equipment, which are applied to a receiver, wherein the blocking signal suppression method comprises the following steps: under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in a receiver or not; if yes, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold; the first starting control threshold is set according to the target of suppressing higher harmonics generated by a blocking signal with frequency outside a pass band; and converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold. In the present application, the demodulation capability of the receiver can be improved in the above manner.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a blocking signal suppression method, a signal demodulation method, a device, and a related apparatus.
Background
In a DMR (Digital Mobile Radio standard) or Tetra (Terrestrial Trunked Radio) narrowband system, a base station receiver generally includes an analog-to-Digital converter, a filter, and other devices, and is mainly used for demodulating target information from a received signal.
The capability of demodulating the target information can reflect the performance of the base station receiver, so that the improvement of the demodulation capability of the receiver is always the target pursued in the design process of the receiver.
Disclosure of Invention
In order to solve the foregoing technical problems, embodiments of the present application provide a blocking signal suppression method, a signal demodulation method, a device, and a related device, so as to achieve the purpose of improving demodulation capability of a receiver, and the technical solution is as follows:
a blocking signal suppression method, applied to a receiver, the method comprising:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
and converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
Preferably, the first start-up threshold is set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal outside the passband.
Preferably, if the frequency of the blocking signal is within the pass band of the filter in the receiver, the automatic gain control start-up threshold of the analog-to-digital converter in the receiver is adjusted to be a second start-up threshold;
the second start-control threshold is set according to the target of suppressing higher harmonics generated by the blocking signal of the frequency in the passband;
and converting the target signal into a second digital signal by using the second starting control threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
Preferably, the second attack threshold is set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal in the passband.
A signal demodulation method applied to a receiver, the method comprising:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
and demodulating the first digital signal to obtain target information.
A blocking signal suppression apparatus for use in a receiver, the apparatus comprising:
the judging module is used for judging whether the frequency of a blocking signal is outside the pass band of a filter in the receiver or not under the condition that the blocking signal exists in a received target signal;
a first adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold if a frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
and the first conversion module is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
Preferably, the first start-up threshold is set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal outside the passband.
Preferably, the apparatus further comprises:
a second adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a second start-up threshold if the frequency of the blocking signal is within a pass band of a filter in the receiver;
the second start-control threshold is set according to the target of suppressing higher harmonics generated by the blocking signal of the frequency in the passband;
and the second conversion module is used for converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
Preferably, the second attack threshold is set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal in the passband.
A signal demodulating apparatus applied to a receiver, the apparatus comprising:
the judging module is used for judging whether the frequency of a blocking signal is outside the pass band of a filter in the receiver or not under the condition that the blocking signal exists in a received target signal;
a first adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold if a frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the first conversion module is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
and the first demodulation module is used for demodulating the first digital signal to obtain target information.
A receiver, comprising: the device comprises a controller, an analog-to-digital converter, a memory and a data bus, wherein the controller and the memory are communicated through the data bus;
the memory is used for storing programs;
the controller is used for executing the program;
the program is specifically for:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the analog-to-digital converter is used for converting the target signal into a first digital signal by using the first start-up threshold, and the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold.
A receiver, comprising: the device comprises a controller, an analog-to-digital converter, a demodulator, a memory and a data bus, wherein the controller and the memory are communicated through the data bus;
the memory is used for storing programs;
the controller is used for executing the program;
the program is specifically for:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the analog-to-digital converter is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
the demodulator is used for demodulating the first digital signal to obtain target information.
Compared with the prior art, the beneficial effect of this application is:
in the application, whether the frequency of a blocking signal is outside the passband of a filter in a receiver is judged to adjust the automatic gain control start-control threshold of the analog-to-digital converter adaptively, specifically, under the condition that the frequency of the blocking signal is outside the passband, the automatic gain control start-control threshold of the analog-to-digital converter is adjusted to be a first start-control threshold, and the first start-control threshold is set according to the target of higher harmonics generated by the blocking signal with the suppression frequency outside the passband, so that the analog-to-digital converter can suppress the higher harmonics generated by the blocking signal based on the first start-control threshold, prevent the higher harmonics from hitting useful signals in the received signals and causing interference on the useful signals, and further improve the demodulation capacity of the receiver.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flow chart of a blocking signal suppression method provided by the present application;
fig. 2 is a flow chart of another blocking signal suppression method provided herein;
fig. 3 is a flow chart of yet another blocking signal suppression method provided by the present application;
fig. 4 is a flow chart of yet another blocking signal suppression method provided by the present application;
fig. 5 is a flow chart of yet another blocking signal suppression method provided by the present application;
fig. 6 is a flow chart of a signal demodulation method provided by the present application;
FIG. 7 is a flow chart of another signal demodulation method provided herein;
fig. 8 is a schematic logical structure diagram of a blocking signal suppression device provided in the present application;
fig. 9 is a schematic diagram of a logic structure of a signal demodulation apparatus provided in the present application.
Detailed Description
In the design and application process of the base station receiver, the inventor of the present application notices that a blocking signal may exist in a signal received by the base station receiver, and the blocking signal may reduce the blocking sensitivity of the receiver and directly affect the demodulation capability of the base station receiver.
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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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.
As shown in fig. 1, a flow chart of embodiment 1 of a blocking signal suppression method provided in the present application is applied to a receiver, and the method includes the following steps:
step S11, under the condition that a blocking signal exists in the received target signal, judging whether the frequency of the blocking signal is outside the pass band of a filter in the receiver;
the blocking signal can be understood as: signals that can cause interference to the desired signal. The useful signal can be understood as: a signal carrying target information.
If yes, go to step S12;
if the frequency of the blocking signal is within the pass band of the filter in the receiver, preferably, the intermediate frequency of the filter in the receiver may be set to be the target intermediate frequency, and after the high-order harmonics in the received target signal are sampled by an ADC (Analog-to-digital converter), the high-order harmonics do not fall into the pass band of the target intermediate frequency, so as to avoid hitting the useful signal in the target signal.
In this embodiment, whether the frequency of the blocking signal is outside the passband of the filter in the receiver may be determined by counting a difference between an input power and an output power of the filter in the receiver. Specifically, if the difference between the input power and the output power of the filter in the receiver is greater than the set power value, it may be determined that the frequency of the blocking signal is outside the pass band of the filter in the receiver; if the difference between the input power and the output power of the filter in the receiver is not greater than the set power value, it can be determined that the frequency of the blocking signal is within the pass band of the filter in the receiver.
And step S12, adjusting the automatic gain control start-up threshold of the ADC in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency outside the passband.
The frequency range of signals outside the passband of the filter in the receiver is wide, and the interference of higher harmonics to useful signals is difficult to avoid by setting the intermediate frequency point of the filter in the receiver, so that the higher harmonics generated by blocking signals with frequencies outside the passband can be suppressed by adjusting the automatic gain control start-control threshold of the ADC in the receiver to be the first start-control threshold, and the higher harmonics are prevented from hitting the useful signals in target signals after being sampled by the ADC.
Preferably, the target for suppressing higher harmonics generated by the blocking signal having a frequency outside the pass band may be set according to actual needs. Specifically, the harmonic generated by the blocking signal with the frequency outside the passband may be suppressed with the goal that the ratio of the remaining harmonic after suppression to the harmonic generated by the blocking signal with the frequency outside the passband is smaller than the set passband signal suppression ratio threshold. The smaller the ratio of the remaining harmonics after suppression to the harmonics generated by the blocking signal having a frequency outside the passband, the better the suppression effect on the harmonics.
And step S13, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
And converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold, so that the interference of the blocking signal outside a band on the useful signal is reduced, the blocking sensitivity of the receiver is improved, and the demodulation capacity of the receiver is improved.
In the application, whether the frequency of a blocking signal is outside the passband of a filter in a receiver is judged to adjust the automatic gain control start-control threshold of the analog-to-digital converter adaptively, specifically, under the condition that the frequency of the blocking signal is outside the passband, the automatic gain control start-control threshold of the analog-to-digital converter is adjusted to be a first start-control threshold, and the first start-control threshold is set according to the target of higher harmonics generated by the blocking signal with the suppression frequency outside the passband, so that the analog-to-digital converter can suppress the higher harmonics generated by the blocking signal based on the first start-control threshold, prevent the higher harmonics from hitting useful signals in the received signals and causing interference on the useful signals, and further improve the demodulation capacity of the receiver.
As another optional embodiment 2 of the present application, referring to fig. 2, a schematic flow chart of an embodiment of a blocking signal suppression method provided in the present application is shown, where this embodiment mainly describes a refinement scheme of the blocking signal suppression method described in the foregoing embodiment, as shown in fig. 2, the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S21, under the condition that a blocking signal exists in the received target signal, judging whether the frequency of the blocking signal is outside the pass band of a filter in the receiver;
if yes, go to step S22.
The detailed process of step S21 can be referred to the related description of step S11 in embodiment 1, and is not repeated here.
Step S22, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to a target of higher harmonics generated by a blocking signal of which the maximum suppression frequency is outside the passband;
the target of maximum suppression of higher harmonics generated by blocking signals with frequencies outside the passband can be understood as: the proportion of the residual higher harmonic after suppression to the higher harmonic generated by the blocking signal with the frequency outside the pass band is minimum.
And under the condition that the first start-control threshold is set according to the target of higher harmonics generated by the blocking signal of which the maximum suppression frequency is outside the passband, adjusting the automatic gain control start-control threshold of the analog-to-digital converter in the receiver to be the first start-control threshold, wherein the first start-control threshold can be-5 dBFS specifically.
And step S23, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
Under the condition that the first start-control threshold is set according to the target of higher harmonics generated by the blocking signal with the maximum suppression frequency outside the passband, after the automatic gain control start-control threshold of the analog-to-digital converter in the receiver is adjusted to be the first start-control threshold, the target signal is converted into a first digital signal by using the first start-control threshold, so that the higher harmonics can be suppressed to the maximum degree, the proportion of the useful signal and the blocking signal in the first digital signal is improved, the blocking sensitivity of the receiver is improved, and the demodulation capability of the receiver is improved to the maximum degree.
The detailed process of step S23 can be referred to the related description of step S13 in embodiment 1, and is not repeated here.
As another optional embodiment 3 of the present application, referring to fig. 3, a schematic flow chart of an embodiment of a blocking signal suppression method provided in the present application is shown, where this embodiment is mainly an extension of the blocking signal suppression method described in the foregoing embodiment 1, as shown in fig. 3, the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S31, when there is a blocking signal in the received target signal, determining whether the frequency of the blocking signal is outside the passband of the filter in the receiver.
If yes, go to step S32; if not, i.e. the frequency of the blocking signal is within the pass band of the filter in the receiver, step S34 is performed.
And step S32, adjusting the automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency outside the passband.
And step S33, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
The detailed procedures of steps S31-S33 can be found in the related descriptions of steps S11-S13 in embodiment 1, and are not repeated herein.
And step S34, adjusting the automatic gain control threshold of the analog-to-digital converter in the receiver to be a second threshold, wherein the second threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency in the passband.
In this embodiment, under the condition that the intermediate frequency of the filter in the receiver is not changed or the target intermediate frequency set by the filter in the receiver is not used, if the frequency of the blocking signal is within the pass band of the filter in the receiver, the automatic gain control start-up threshold of the analog-to-digital converter in the receiver may be adjusted to be the second start-up threshold, so as to suppress the blocking signal in the pass band.
Preferably, the target for suppressing higher harmonics generated by the blocking signal having a frequency within the pass band may be set according to actual needs. Specifically, the harmonic generated by the blocking signal having the frequency within the passband may be suppressed with the goal of suppressing the ratio of the remaining harmonic after suppression to the harmonic generated by the blocking signal having the frequency within the passband being smaller than the set passband signal suppression ratio threshold. The smaller the ratio of the remaining harmonics after suppression to the harmonics generated by the blocking signal having a frequency within the passband, the better the suppression effect on the harmonics.
And step S35, converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
And converting the target signal into a second digital signal by using the second start-control threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold, so that the interference of the blocking signal in a passband on the useful signal is reduced, the blocking sensitivity of the receiver is improved, and the demodulation capacity of the receiver is improved.
As another optional embodiment 4 of the present application, referring to fig. 4, a schematic flow chart of an embodiment of a blocking signal suppression method provided in the present application is shown, where this embodiment mainly describes a refinement scheme of the blocking signal suppression method described in the foregoing embodiment 3, as shown in fig. 4, the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S41, when there is a blocking signal in the received target signal, determining whether the frequency of the blocking signal is outside the passband of the filter in the receiver.
If yes, go to step S42; if not, i.e. the frequency of the blocking signal is within the pass band of the filter in the receiver, step S44 is performed.
And step S42, adjusting the automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency outside the passband.
And step S43, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
The detailed procedures of steps S41-S43 can be found in the related descriptions of steps S11-S13 in embodiment 1, and are not repeated herein.
And step S44, adjusting the automatic gain control start-control threshold of the analog-to-digital converter in the receiver to be a second start-control threshold, wherein the second start-control threshold is set according to the target of the higher harmonic generated by the blocking signal of which the maximum suppression frequency is in the passband.
The target of maximum rejection of higher harmonics generated by blocking signals with frequencies within the passband can be understood as: the ratio of the remaining higher harmonics after suppression to the higher harmonics generated by the blocking signal having a frequency within the passband is minimized.
And under the condition that the second start-up control threshold is set according to the target of higher harmonics generated by the blocking signal of the maximum suppression frequency in the passband, adjusting the automatic gain control start-up control threshold of the analog-to-digital converter in the receiver to be the second start-up control threshold, wherein the second start-up control threshold can be-1 dBFS specifically.
And step S45, converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
The detailed process of step S45 can be referred to the related description of step S35 in embodiment 3, and is not repeated here.
Under the condition that the second start-control threshold is set according to the target of the higher harmonic generated by the blocking signal of the maximum suppression frequency in the passband, after the automatic gain control start-control threshold of the analog-to-digital converter in the receiver is adjusted to be the second start-control threshold, the target signal is converted into a second digital signal by using the second start-control threshold, the higher harmonic can be suppressed to the maximum degree, the proportion of the useful signal and the blocking signal in the second digital signal is improved, the blocking sensitivity of the receiver is improved, and therefore the demodulation capability of the receiver is improved to the maximum degree.
As another optional embodiment 5 of the present application, referring to fig. 5, a schematic flow chart of an embodiment of a blocking signal suppression method provided in the present application is shown, where this embodiment mainly describes a refinement scheme of the blocking signal suppression method described in the foregoing embodiment 3, as shown in fig. 5, the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S51, when there is a blocking signal in the received target signal, determining whether the frequency of the blocking signal is outside the passband of the filter in the receiver.
If yes, go to step S52; if not, i.e. the frequency of the blocking signal is within the pass band of the filter in the receiver, step S54 is performed.
And step S52, adjusting the automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of the higher harmonic generated by the blocking signal of which the maximum suppression frequency is outside the passband.
And step S53, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
The detailed procedures of steps S51-S53 can be referred to the related descriptions of steps S21-S23 in embodiment 2, and are not described herein again.
And step S54, adjusting the automatic gain control start-control threshold of the analog-to-digital converter in the receiver to be a second start-control threshold, wherein the second start-control threshold is set according to the target of the higher harmonic generated by the blocking signal of which the maximum suppression frequency is in the passband.
The target of maximum rejection of higher harmonics generated by blocking signals with frequencies within the passband can be understood as: the ratio of the remaining higher harmonics after suppression to the higher harmonics generated by the blocking signal having a frequency within the passband is minimized.
And under the condition that the second start-up control threshold is set according to the target of higher harmonics generated by the blocking signal of the maximum suppression frequency in the passband, adjusting the automatic gain control start-up control threshold of the analog-to-digital converter in the receiver to be the second start-up control threshold, wherein the second start-up control threshold can be-1 dBFS specifically.
And step S55, converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
The detailed process of step S55 can be referred to the related description of step S35 in embodiment 3, and is not repeated here.
As another alternative embodiment 6, referring to fig. 6, there is provided a schematic flow chart of an embodiment of a signal demodulation method provided in the present application, where the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S61, when there is a blocking signal in the received target signal, determining whether the frequency of the blocking signal is outside the passband of the filter in the receiver.
If yes, go to step S62.
And step S62, adjusting the automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency outside the passband.
And step S63, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
The detailed procedures of steps S61-S63 can be found in the related descriptions of steps S11-S13 in embodiment 1, and are not repeated herein.
And step S64, demodulating the first digital signal to obtain target information.
When the interference of the blocking signal to the useful signal in the first digital signal is reduced, the first digital signal is demodulated, so that the demodulation reliability can be improved, and the demodulation capacity of the receiver can be improved.
As another optional embodiment 7 of the present application, referring to fig. 7, a schematic flow chart of an embodiment of a signal demodulation method provided in the present application is shown, and this embodiment is mainly an extension of the signal demodulation method described in the foregoing embodiment 5, as shown in fig. 7, the method is applied to a receiver, and the method may include, but is not limited to, the following steps:
step S71, when there is a blocking signal in the received target signal, determining whether the frequency of the blocking signal is outside the passband of the filter in the receiver.
If yes, go to step S72; if not, step S75 is executed.
And step S72, adjusting the automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold, wherein the first start-up threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency outside the passband.
And step S73, converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
And step S74, demodulating the first digital signal to obtain target information.
The detailed procedures of steps S71-S74 can be found in the related descriptions of steps S61-S64 in embodiment 6, and are not repeated herein.
And step S75, adjusting the automatic gain control threshold of the analog-to-digital converter in the receiver to be a second threshold, wherein the second threshold is set according to the target of suppressing higher harmonics generated by the blocking signal with the frequency in the passband.
And step S76, converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
The detailed procedures of steps S75-S76 can be referred to the related descriptions of steps S34-S35 in embodiment 3, and are not described herein again.
And step S77, demodulating the second digital signal to obtain target information.
When the interference of the blocking signal in the second digital signal to the useful signal is reduced, the second digital signal is demodulated, so that the demodulation reliability can be improved, and the demodulation capability of the receiver can be improved.
Next, a blocking signal suppressing apparatus provided in the present application will be described, and the blocking signal suppressing apparatus described below and the blocking signal suppressing method described above may be referred to in correspondence with each other.
Referring to fig. 8, the blocking signal suppressing apparatus is applied to a receiver, and includes: a judging module 11, a first adjusting module 12 and a first converting module 13.
A judging module 11, configured to judge whether a frequency of a blocking signal is outside a pass band of a filter in the receiver when the blocking signal exists in a received target signal;
a first adjusting module 12, configured to adjust an agc threshold of an adc in the receiver to be a first threshold if the frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
a first conversion module 13, configured to convert the target signal into a first digital signal by using the first start-up threshold, where a ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold.
In this embodiment, the first start-up threshold may be set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal outside the passband.
In this embodiment, the blocking signal suppressing apparatus may further include:
a second adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a second start-up threshold if the frequency of the blocking signal is within a pass band of a filter in the receiver;
the second start-control threshold is set according to the target of suppressing higher harmonics generated by the blocking signal of the frequency in the passband;
and the second conversion module is used for converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
In this embodiment, the second start-control threshold may be set according to a target of a maximum suppression frequency for higher harmonics generated by a blocking signal in the passband.
In another embodiment of the present application, there is provided a receiver including: the device comprises a controller, an analog-to-digital converter, a memory and a data bus, wherein the controller and the memory are communicated through the data bus;
the memory is used for storing programs;
the controller is used for executing the program;
the program is specifically for:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the analog-to-digital converter is used for converting the target signal into a first digital signal by using the first start-up threshold, and the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold.
Next, a signal demodulation apparatus provided in the present application will be described, and the signal demodulation apparatus described below and the signal demodulation method described above may be referred to in correspondence with each other.
Referring to fig. 9, the signal demodulating apparatus is applied to a receiver, and the signal demodulating apparatus includes: the device comprises a judging module 21, a first adjusting module 22, a first converting module 23 and a first demodulating module 24.
A judging module 21, configured to judge whether a frequency of a blocking signal is outside a pass band of a filter in the receiver when the blocking signal exists in a received target signal;
a first adjusting module 22, configured to adjust an agc threshold of an adc in the receiver to be a first threshold if the frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
a first conversion module 23, configured to convert the target signal into a first digital signal by using the first start-up threshold, where a ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
the first demodulation module 24 is configured to demodulate the first digital signal to obtain target information.
In another embodiment of the present application, there is provided a receiver including: the device comprises a controller, an analog-to-digital converter, a demodulator, a memory and a data bus, wherein the controller and the memory are communicated through the data bus;
the memory is used for storing programs;
the controller is used for executing the program;
the program is specifically for:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of the analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the analog-to-digital converter is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
the demodulator is used for demodulating the first digital signal to obtain target information.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The blocking signal suppression method, the signal demodulation method, the apparatus and the related devices provided by the present application are introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of blocking signal suppression, for use in a receiver, the method comprising:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
and converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
2. The method of claim 1, wherein the first starting threshold is set based on a target for maximum rejection of higher harmonics generated by blocking signals having frequencies outside the passband.
3. The method of claim 1, wherein if the frequency of the blocking signal is within the pass band of a filter in the receiver, adjusting an automatic gain control threshold of an analog-to-digital converter in the receiver to a second threshold;
the second start-control threshold is set according to the target of suppressing higher harmonics generated by the blocking signal of the frequency in the passband;
and converting the target signal into a second digital signal by using the second starting control threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
4. A method according to claim 3, characterized in that the second attack threshold is set according to a target for higher harmonics generated by blocking signals with a maximum suppression frequency in the pass band.
5. A method for demodulating a signal, the method being applied to a receiver, the method comprising:
under the condition that a blocking signal exists in a received target signal, judging whether the frequency of the blocking signal is outside the passband of a filter in the receiver;
if yes, adjusting an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
and demodulating the first digital signal to obtain target information.
6. A blocking signal suppression apparatus, for use in a receiver, the apparatus comprising:
the judging module is used for judging whether the frequency of a blocking signal is outside the pass band of a filter in the receiver or not under the condition that the blocking signal exists in a received target signal;
a first adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold if a frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
and the first conversion module is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of the useful signal to the blocking signal in the first digital signal is higher than a first set ratio threshold.
7. The apparatus of claim 6, wherein the first starting threshold is set according to a target of a maximum rejection frequency for higher harmonics generated by blocking signals outside the passband.
8. The apparatus of claim 6, further comprising:
a second adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a second start-up threshold if the frequency of the blocking signal is within a pass band of a filter in the receiver;
the second start-control threshold is set according to the target of suppressing higher harmonics generated by the blocking signal of the frequency in the passband;
and the second conversion module is used for converting the target signal into a second digital signal by using the second control starting threshold, wherein the ratio of the useful signal to the blocking signal in the second digital signal is higher than a second set ratio threshold.
9. The apparatus of claim 8, wherein the second attack threshold is set based on a target for a maximum suppression frequency of higher harmonics generated by blocking signals within the passband.
10. A signal demodulation apparatus, for use in a receiver, the apparatus comprising:
the judging module is used for judging whether the frequency of a blocking signal is outside the pass band of a filter in the receiver or not under the condition that the blocking signal exists in a received target signal;
a first adjusting module, configured to adjust an automatic gain control start-up threshold of an analog-to-digital converter in the receiver to be a first start-up threshold if a frequency of the blocking signal is outside a passband of a filter in the receiver;
the first starting control threshold is set according to the target of suppressing higher harmonics generated by the blocking signals with the frequency outside the pass band;
the first conversion module is used for converting the target signal into a first digital signal by using the first start-up threshold, wherein the ratio of a useful signal to a blocking signal in the first digital signal is higher than a first set ratio threshold;
and the first demodulation module is used for demodulating the first digital signal to obtain target information.
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