CN110635813B - Anti-blocking receiver, and control method and device of receiver - Google Patents
Anti-blocking receiver, and control method and device of receiver Download PDFInfo
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- CN110635813B CN110635813B CN201810646328.9A CN201810646328A CN110635813B CN 110635813 B CN110635813 B CN 110635813B CN 201810646328 A CN201810646328 A CN 201810646328A CN 110635813 B CN110635813 B CN 110635813B
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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
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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
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Abstract
The present disclosure relates to an anti-blocking receiver, a method and an apparatus for controlling the receiver, the receiver including: the radio frequency front end comprises a radio frequency front end, an analog filter, a PGA, an ADC and an RSSI detection module, wherein the input end of the radio frequency front end is used as the input end of an anti-blocking receiver, the output end of the ADC is used as the output end of the anti-blocking receiver, the output end of the anti-blocking receiver is connected with a baseband processor, the output end of the radio frequency front end is connected with the input end of the analog filter, the output end of the analog filter is connected with the input end of the PGA, the output end of the PGA is connected with the input end of the ADC, the input end of the RSSI detection module is respectively connected with the input end and the output end of the analog filter, the output end of the RSSI detection module is connected with the input end of the ADC, and the RSSI detection module is used for detecting the signal intensity of the input signal and the output signal of the analog filter so as to control the gain of the radio frequency front end by the baseband processor. The anti-blocking performance of the receiver can be improved, and the volume and the manufacturing cost of the receiver can be reduced.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to an anti-blocking receiver, and a method and an apparatus for controlling the receiver.
Background
With the continuous development of mobile communication technology, the internet of everything that interconnects between people and Things and between Things starts to be continuously integrated into people's lives, wherein a narrowband internet of Things (abbreviated as NB-IoT) is taken as an important branch of the internet of Things, and has the advantages of wide coverage, large number of supported connections, low power consumption and low cost, and thus, the internet of Things is widely applied. In order to improve the noise figure, the receiver of the narrowband internet of things generally sets the gain of the radio frequency front end to be maximum, and at the same time, the linearity of the radio frequency front end is deteriorated, and the anti-blocking capability is reduced. Therefore, for the problem of large signal blocking, an external filter is usually added to the receiver to filter out the out-of-band interference signal, but the occupied volume and manufacturing cost of the receiver are increased, so that the popularization of the narrow-band internet of things technology is limited.
Disclosure of Invention
The invention aims to provide an anti-blocking receiver, a receiver control method and a receiver control device, which are used for solving the problems of large size and high manufacturing cost caused by an external filter added for anti-blocking.
To achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided an anti-blocking receiver, including: the system comprises a radio frequency front end, an analog filter, a programmable gain amplifier PGA, an analog-to-digital converter ADC and a received signal strength indicator RSSI detection module;
the input end of the radio frequency front end is used as the input end of the anti-blocking receiver, the output end of the ADC is used as the output end of the anti-blocking receiver, and the output end of the anti-blocking receiver is connected with the baseband processor;
the output end of the radio frequency front end is connected with the input end of the analog filter, the output end of the analog filter is connected with the input end of the PGA, and the output end of the PGA is connected with the input end of the ADC;
the input end of the RSSI detection module is respectively connected with the input end and the output end of the analog filter, and the output end of the RSSI detection module is connected with the input end of the ADC;
the RSSI detection module is used for detecting the signal strength of the input signal and the output signal of the analog filter so as to control the gain of the radio frequency front end by the baseband processor.
Optionally, the RSSI detection module includes a first RSSI detection sub-module and a second RSSI detection sub-module;
the input end of the first RSSI detection submodule is connected with the input end of the analog filter, the output end of the first RSSI detection submodule is connected with the input end of the ADC, the input end of the second RSSI detection submodule is connected with the output end of the analog filter, and the output end of the second RSSI detection submodule is connected with the input end of the ADC;
the first RSSI detection submodule is used for detecting the signal strength of an input signal of the analog filter, and the second RSSI detection submodule is used for detecting the signal strength of an output signal of the analog filter.
Optionally, the radio frequency front end includes: a low noise amplifier LNA and a mixer;
the input end of the LNA is used as the input end of the radio frequency front end, the output end of the LNA is connected with the input end of the mixer, and the output end of the mixer is used as the output end of the radio frequency front end.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for controlling a receiver, which is applied to any one of the anti-blocking receivers provided in the first aspect of the embodiments of the present disclosure, the method including:
acquiring a signal-to-noise ratio of the anti-blocking receiver by using the baseband processor;
acquiring a first signal strength of an input signal and a second signal strength of an output signal of the analog filter by using the RSSI detection module;
and when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold and the difference value between the second signal strength and the first signal strength is larger than a preset signal strength threshold, reducing the gain of the radio frequency front end by using the baseband processor.
Optionally, after the reducing the gain of the radio frequency front end by using the baseband processor, the method further includes:
the step of obtaining the signal-to-noise ratio of the anti-blocking receiver by the baseband processor is executed again;
and when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal intensity and the first signal intensity is greater than the signal intensity threshold, the baseband processor is utilized to keep the gain of the radio frequency front end unchanged.
Optionally, the method further includes:
and when the signal-to-noise ratio is greater than or equal to the second signal-to-noise ratio threshold, controlling the gain of the radio frequency front end to be adjusted to a maximum value by using the baseband processor.
Optionally, the reducing the gain of the radio frequency front end by using the baseband processor includes:
reducing the gain of the radio frequency front end by a unity gain; or the like, or, alternatively,
and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
According to a third aspect of the embodiments of the present disclosure, there is provided a control device for a receiver, which is applied to any one of the anti-blocking receivers provided in the first aspect of the embodiments of the present disclosure, the device including:
a signal-to-noise ratio obtaining module, configured to obtain, by using the baseband processor, a signal-to-noise ratio of the anti-blocking receiver;
the signal strength acquisition module is used for acquiring first signal strength of an input signal and second signal strength of an output signal of the analog filter by using the RSSI detection module;
and the first control module is used for reducing the gain of the radio frequency front end by using the baseband processor when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold and the difference value between the second signal strength and the first signal strength is larger than a preset signal strength threshold.
Optionally, the apparatus further comprises:
a second control module, configured to perform the step of obtaining the snr of the anti-blocking receiver by using the baseband processor again after the gain of the rf front end is reduced by using the baseband processor; and when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal intensity and the first signal intensity is greater than the signal intensity threshold, the baseband processor is utilized to keep the gain of the radio frequency front end unchanged.
Optionally, the apparatus further comprises:
and the third control module is used for controlling the gain of the radio frequency front end to be adjusted to the maximum value by utilizing the baseband processor when the signal-to-noise ratio is greater than or equal to the second signal-to-noise ratio threshold.
Optionally, the first control module is configured to:
reducing the gain of the radio frequency front end by a unity gain; or the like, or, alternatively,
and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
According to the technical scheme, the RSSI detection module is additionally arranged in the receiver to detect the signal strength of the input signal and the output signal of the analog filter, so that whether the anti-blocking receiver is blocked by a large signal currently is judged according to the signal-to-noise ratio, the difference value of the signal strength of the output signal and the signal strength of the input signal of the analog filter and the corresponding threshold value, when the large signal blockage currently exists is determined, the gain of the radio frequency front end is reduced by using the baseband processor, the linearity and the anti-blocking performance of the radio frequency front end are improved on the premise that the external filter is not added, and meanwhile, the volume and the manufacturing cost of the receiver are reduced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of an anti-jamming receiver in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating another anti-jamming receiver in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating another anti-jamming receiver in accordance with an exemplary embodiment;
FIG. 4 is a flow chart illustrating a method of controlling a receiver in accordance with an exemplary embodiment;
FIG. 5 is a flow chart illustrating another method of controlling a receiver in accordance with an exemplary embodiment;
FIG. 6 is a flow chart illustrating another method of controlling a receiver in accordance with an exemplary embodiment;
FIG. 7 is a block diagram illustrating a control apparatus of a receiver in accordance with an exemplary embodiment;
fig. 8 is a block diagram illustrating another receiver control arrangement in accordance with an exemplary embodiment;
fig. 9 is a block diagram illustrating another receiver control apparatus according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fig. 1 is a schematic diagram of an anti-blocking receiver according to an exemplary embodiment, and as shown in fig. 1, the anti-blocking receiver 100 includes: a radio frequency front end 101, an Analog filter 102, a PGA (Programmable Gain Amplifier, chinese) 103, an ADC (Analog-to-Digital Converter, chinese) 104, and an RSSI (Received Signal Strength Indication) detection module 105.
The input terminal of the rf front end 101 serves as the input terminal of the anti-blocking receiver, the output terminal of the ADC 104 serves as the output terminal of the anti-blocking receiver 100, and the output terminal of the anti-blocking receiver 100 is connected to the baseband processor.
The output end of the rf front end 101 is connected to the input end of the analog filter 102, the output end of the analog filter 102 is connected to the input end of the PGA 103, and the output end of the PGA 103 is connected to the input end of the ADC 104.
For example, the Input (IN) and the Output (OUT) of the anti-blocking receiver 100 are the input of the rf front-end 101 and the output of the ADC 104, respectively, and the output of the anti-blocking receiver 100 is connected to a baseband processor, wherein the baseband processor is configured to demodulate the signal (processed by amplification, filtering, analog-to-digital conversion, etc.) received by the anti-blocking receiver and to control the gain of the rf front-end. The analog signal enters the analog filter 102 through the radio frequency front end 101, enters the PGA 103 for amplification after being filtered, finally undergoes analog-to-digital conversion through the ADC 104, and sends the converted digital signal to the baseband processor. In the present disclosure, the connection modes between the modules may be electrical direct connection or coupling connection, and the connection modes are not limited in the present disclosure.
The input end of the RSSI detection module 105 is connected to the input end and the output end of the analog filter 102, respectively, and the output end of the RSSI detection module 105 is connected to the input end of the ADC 104.
The RSSI detection module 105 is used to detect the signal strength of the input signal and the output signal of the analog filter 102, so that the baseband processor can control the gain of the rf front end 101.
Illustratively, the RSSI detection module 105 has two input terminals, which are respectively connected to the input terminal and the output terminal of the analog filter 102, and sends the signal strength (analog signal) of the input signal and the output signal of the analog filter 102 to the ADC 104, and the ADC 104 converts the analog signal into a digital signal, so that the baseband processor can determine whether there is large signal blockage currently and whether it is necessary to adjust the gain of the rf front end 101. The RSSI detection module 105 is a module for detecting signal strength by using RSSI technology, and can be built in an anti-blocking receiver, unlike an external filter, without increasing material cost and receiver volume. It should be noted that the ADC 104 may be an analog-to-digital conversion chip, and includes multiple input terminals, and can process analog-to-digital conversion tasks of multiple signals, respectively, that is, can process output signals (including the input signal and the output signal of the analog filter 102) of the RSSI detection module 105 at the same time, and can also process output signals of the PGA 103.
For example, the baseband processor may determine whether the processing of the current anti-blocking receiver is degraded by comparing a Signal-to-Noise Ratio (SNR) with a preset SNR threshold, and further determine whether the SNR degradation is caused by large Signal blocking according to a difference between Signal strengths of the output Signal and the input Signal of the analog filter 102 and the preset SNR threshold. When it is determined that the anti-blocking receiver currently has large signal blocking, the baseband processor may send a control signal to the rf front end 101 to reduce the gain of the rf front end 101.
In summary, the RSSI detection module is added in the receiver to detect the signal strength of the input signal and the output signal of the analog filter, so as to determine whether the anti-blocking receiver has large signal blocking currently according to the signal-to-noise ratio, the difference value between the signal strength of the output signal and the signal strength of the input signal of the analog filter, and the corresponding threshold value, and when it is determined that the large signal blocking currently exists, the gain of the radio frequency front end is reduced by using the baseband processor, so that the linearity and the anti-blocking performance of the radio frequency front end are improved on the premise of not increasing the external filter, and the volume and the manufacturing cost of the receiver are reduced at the same time.
Fig. 2 is a schematic diagram of another anti-blocking receiver according to an exemplary embodiment, and as shown in fig. 2, the RSSI detection module 105 includes a first RSSI detection sub-module 1051 and a second RSSI detection sub-module 1052.
The input end of the first RSSI detection sub-module 1051 is connected to the input end of the analog filter 102, the output end of the first RSSI detection sub-module 1051 is connected to the input end of the ADC 104, the input end of the second RSSI detection sub-module 1052 is connected to the output end of the analog filter 102, and the output end of the second RSSI detection sub-module 1052 is connected to the input end of the ADC 104.
The first RSSI detection sub-module 1051 is used to detect the signal strength of the input signal of the analog filter 102, and the second RSSI detection sub-module 1052 is used to detect the signal strength of the output signal of the analog filter 102.
For example, the RSSI detection module 105 may include a first RSSI detection sub-module 1051 and a second RSSI detection sub-module 1052 for detecting the input signal and the output signal, respectively, of the analog filter 102. The output of the first RSSI detection sub-module 1051 and the output of the second RSSI detection sub-module 1052 are both connected to the input of the ADC 104.
Fig. 3 is a schematic diagram of another anti-blocking receiver according to an exemplary embodiment, and as shown in fig. 3, the rf front end 101 includes: LNA (Low Noise Amplifier, Chinese) 1011 and Mixer (Mixer) 1012.
The input end of the LNA 1011 serves as the input end of the rf front end 101, the output end of the LNA 1011 is connected to the input end of the mixer 1012, and the output end of the mixer 1012 serves as the output end of the rf front end 101.
For example, the rf front end 101 may include an LNA 1011 and a mixer 1012, and the mixer 1021 is configured to mix the rf signal amplified by the LNA 1011 according to an LO (Local oscillator) signal, and input the mixed signal to the analog filter 102. The gain of the LNA 1011 is adjustable and can be controlled according to a control signal of the baseband processor.
In summary, the RSSI detection module is added in the receiver to detect the signal strength of the input signal and the output signal of the analog filter, so as to determine whether the anti-blocking receiver has large signal blocking currently according to the signal-to-noise ratio, the difference value between the signal strength of the output signal and the signal strength of the input signal of the analog filter, and the corresponding threshold value, and when it is determined that the large signal blocking currently exists, the gain of the radio frequency front end is reduced by using the baseband processor, so that the linearity and the anti-blocking performance of the radio frequency front end are improved on the premise of not increasing the external filter, and the volume and the manufacturing cost of the receiver are reduced at the same time.
Fig. 4 is a flow chart illustrating a method of controlling a receiver, as shown in fig. 4, applied to any one of the anti-jamming receivers shown in fig. 1-3, according to an exemplary embodiment, the method including:
For example, the baseband processor determines a signal-to-noise ratio of the anti-jamming receiver according to a signal received by the anti-jamming receiver, and obtains a difference between a first signal strength and a second signal strength obtained by the RSSI detection module.
And 203, when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold, and the difference value between the second signal strength and the first signal strength is larger than the preset signal strength threshold, reducing the gain of the radio frequency front end by using the baseband processor.
For example, when the signal-to-noise ratio is smaller than the first signal-to-noise ratio threshold, it is indicated that the performance of the current anti-blocking receiver is significantly degraded, and a useful signal cannot be demodulated from the signal, at this time, a cause of the degradation needs to be further determined, and when the difference between the second signal strength and the first signal strength is larger than the signal strength threshold, it is determined that the current anti-blocking receiver has large signal blocking. Since the reason for generating large signal blocking is mainly caused by the nonlinearity of the device in the rf front end, and in order to improve the performance of the anti-blocking receiver, the gain of the rf front end is usually set to the maximum value, so that when large signal blocking occurs, the linearity of the device can be improved by reducing the gain of the rf front end, thereby improving the anti-blocking performance. The gain reduction of the radio frequency front end is controlled by the baseband processor. Normally, the gain of the rf front end is divided into a plurality of steps, so the baseband processor sequentially reduces the steps of the rf front end by sending a control signal until the baseband processor can demodulate the signal processed by the anti-blocking receiver normally. The first snr threshold may be a demodulation threshold of the baseband processor, that is, when the snr is lower than the first snr threshold, the baseband processor cannot demodulate the signal normally. The first snr threshold and the signal strength threshold may be preset in the baseband processor, or may be adjusted according to actual situations, for example, the first snr threshold may be-2 dB, and the signal strength threshold may be 20 dB.
Fig. 5 is a flowchart illustrating another receiver control method according to an exemplary embodiment, where as shown in fig. 5, after step 203, step 201 is performed again, and the method further includes:
and step 204, when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal intensity and the first signal intensity is greater than the signal intensity threshold, using the baseband processor to keep the gain of the radio frequency front end unchanged.
For example, taking the gain of the rf front end divided into four steps, the first step gain is the largest, the gains are sequentially decreased, and the fourth step gain is the smallest, in step 203, the baseband processor decreases the gain of the rf front end, and adjusts the first step to the second step, at this time, the signal-to-noise ratio of the signal processed by the anti-blocking receiver may still not reach the state capable of enabling the baseband processor to demodulate normally, so step 201 may be executed again to continue to obtain the signal-to-noise ratio of the anti-blocking receiver, the first signal strength, and the second signal strength.
If the snr is less than the preset first snr threshold and the difference between the second signal strength and the first signal strength is greater than the preset signal strength threshold, step 203 is executed to decrease the gain of the rf front end again, which may be adjusted from the second gear to the third gear. If the snr is greater than or equal to the first snr threshold and less than a preset second snr threshold (for example, may be 3dB), and a difference between the second signal strength and the first signal strength is greater than the signal strength threshold, which indicates that the snr of the signal processed by the current anti-blocking receiver can enable the baseband processor to demodulate normally, but there is still large signal blocking, at this time, the baseband processor stops adjusting the gain of the rf front end, and controls the gain of the rf front end to remain unchanged.
Fig. 6 is a flow chart illustrating another method of controlling a receiver according to an exemplary embodiment, as shown in fig. 6, the method further comprising:
For example, when the signal-to-noise ratio is greater than or equal to the second signal-to-noise ratio threshold, it is indicated that the current signal has significantly improved, and there is no large signal blocking, and at this time, the requirement on the linearity of the radio frequency front end is not high, so that the gain of the radio frequency front end can be adjusted to the maximum value again to ensure the performance of the anti-blocking receiver. Taking the example that the gain of the radio frequency front end is divided into four steps, the gain of the first step is the largest, the gains are sequentially reduced, and the gain of the fourth step is the smallest, when the anti-blocking receiver normally works, the gain of the radio frequency front end is the first step, when the baseband processor determines that the large signal blocking exists currently, the step 203 is executed to lower the gain of the radio frequency front end until the step 204 is executed, the baseband processor can normally demodulate the signal, at the moment, the gain of the radio frequency front end can be the third step, and when the signal to noise ratio is larger than or equal to the second signal to noise ratio threshold, the gain of the radio frequency front end is adjusted to the first step by the baseband processor.
Optionally, step 203 may be implemented by:
a. the gain of the radio frequency front end is reduced by one unity gain. Or the like, or, alternatively,
b. and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
For example, the reduction of the gain of the radio frequency front end may be realized by reducing the gain of the radio frequency front end by one unit gain, and one unit gain may be one gain step of the radio frequency front end, may also be 1dB, and may also be set according to a specific application scenario. Further, the gain of the radio frequency front end may be reduced to a target gain corresponding to the signal-to-noise ratio according to a preset corresponding relationship between the signal-to-noise ratio and the gain, where the corresponding relationship may be a functional relationship between the signal-to-noise ratio and the gain, or a relationship table between the signal-to-noise ratio and the gain, for example, a functional model between the signal-to-noise ratio and the gain, which is established by using a preset algorithm (e.g., a learning algorithm) according to empirical data and/or experimental data.
In summary, the RSSI detection module is added in the receiver to detect the signal strength of the input signal and the output signal of the analog filter, so as to determine whether the anti-blocking receiver has large signal blocking currently according to the signal-to-noise ratio, the difference value between the signal strength of the output signal and the signal strength of the input signal of the analog filter, and the corresponding threshold value, and when it is determined that the large signal blocking currently exists, the gain of the radio frequency front end is reduced by using the baseband processor, so that the linearity and the anti-blocking performance of the radio frequency front end are improved on the premise of not increasing the external filter, and the volume and the manufacturing cost of the receiver are reduced at the same time.
Fig. 7 is a block diagram of a control apparatus of a receiver according to an exemplary embodiment, as shown in fig. 7, applied to any one of the anti-blocking receivers shown in fig. 1-3, the apparatus 300 including:
the snr obtaining module 301 is configured to obtain an snr of the anti-blocking receiver by using the baseband processor.
A signal strength obtaining module 302, configured to obtain a first signal strength of the input signal and a second signal strength of the output signal of the analog filter by using the RSSI detection module.
The first control module 303 is configured to reduce a gain of the radio frequency front end by using the baseband processor when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold and a difference between the second signal strength and the first signal strength is larger than the preset signal strength threshold.
Fig. 8 is a block diagram illustrating another control apparatus of a receiver according to an exemplary embodiment, and as shown in fig. 8, the apparatus 300 further includes:
a second control module 304, configured to perform the step of obtaining the signal-to-noise ratio of the anti-blocking receiver by the baseband processor again after reducing the gain of the radio frequency front end by the baseband processor. And when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal intensity and the first signal intensity is greater than the signal intensity threshold, the gain of the radio frequency front end is kept unchanged by using the baseband processor.
Fig. 9 is a block diagram illustrating another control apparatus of a receiver according to an exemplary embodiment, and as shown in fig. 9, the apparatus 300 further includes:
a third control module 305, configured to control the gain of the rf front end to be adjusted to a maximum value by using the baseband processor when the snr is greater than or equal to the second snr threshold.
Optionally, the first control module 303 may be implemented by:
a. the gain of the radio frequency front end is reduced by one unity gain. Or the like, or, alternatively,
b. and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
In summary, the RSSI detection module is added in the receiver to detect the signal strength of the input signal and the output signal of the analog filter, so as to determine whether the anti-blocking receiver has large signal blocking currently according to the signal-to-noise ratio, the difference value between the signal strength of the output signal and the signal strength of the input signal of the analog filter, and the corresponding threshold value, and when it is determined that the large signal blocking currently exists, the gain of the radio frequency front end is reduced by using the baseband processor, so that the linearity and the anti-blocking performance of the radio frequency front end are improved on the premise of not increasing the external filter, and the volume and the manufacturing cost of the receiver are reduced at the same time.
Preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and other embodiments of the present disclosure may be easily conceived by those skilled in the art within the technical spirit of the present disclosure after considering the description and practicing the present disclosure, and all fall within the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. Meanwhile, any combination can be made between various different embodiments of the disclosure, and the disclosure should be regarded as the disclosure of the disclosure as long as the combination does not depart from the idea of the disclosure. The present disclosure is not limited to the precise structures that have been described above, and the scope of the present disclosure is limited only by the appended claims.
Claims (9)
1. An anti-jamming receiver, characterized in that the anti-jamming receiver comprises: the system comprises a radio frequency front end, an analog filter, a programmable gain amplifier PGA, an analog-to-digital converter ADC and a received signal strength indicator RSSI detection module;
the input end of the radio frequency front end is used as the input end of the anti-blocking receiver, the output end of the ADC is used as the output end of the anti-blocking receiver, and the output end of the anti-blocking receiver is connected with the baseband processor;
the output end of the radio frequency front end is connected with the input end of the analog filter, the output end of the analog filter is connected with the input end of the PGA, and the output end of the PGA is connected with the input end of the ADC;
the input end of the RSSI detection module is respectively connected with the input end and the output end of the analog filter, and the output end of the RSSI detection module is connected with the input end of the ADC;
the RSSI detection module is used for detecting the signal strength of the input signal and the output signal of the analog filter so that the baseband processor reduces the gain of the radio frequency front end when the signal-to-noise ratio of the anti-blocking receiver is smaller than a preset first signal-to-noise ratio threshold and the difference value of the signal strength of the input signal and the signal strength of the output signal of the analog filter is larger than a preset signal strength threshold; and acquiring the signal-to-noise ratio of the anti-blocking receiver again; when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the signal strength of the input signal and the signal strength of the output signal of the analog filter is greater than the signal strength threshold, the gain of the radio frequency front end is kept unchanged, and the first signal-to-noise ratio threshold is the demodulation threshold of the baseband processor.
2. The anti-jamming receiver of claim 1, wherein the RSSI detection module includes a first RSSI detection sub-module and a second RSSI detection sub-module;
the input end of the first RSSI detection submodule is connected with the input end of the analog filter, the output end of the first RSSI detection submodule is connected with the input end of the ADC, the input end of the second RSSI detection submodule is connected with the output end of the analog filter, and the output end of the second RSSI detection submodule is connected with the input end of the ADC;
the first RSSI detection submodule is used for detecting the signal strength of an input signal of the analog filter, and the second RSSI detection submodule is used for detecting the signal strength of an output signal of the analog filter.
3. The anti-jamming receiver according to claim 1, wherein the radio frequency front end comprises: a low noise amplifier LNA and a mixer;
the input end of the LNA is used as the input end of the radio frequency front end, the output end of the LNA is connected with the input end of the mixer, and the output end of the mixer is used as the output end of the radio frequency front end.
4. A method of controlling a receiver, applied to the anti-jamming receiver of any one of claims 1-3, the method comprising:
acquiring a signal-to-noise ratio of the anti-blocking receiver by using the baseband processor;
acquiring a first signal strength of an input signal and a second signal strength of an output signal of the analog filter by using the RSSI detection module;
when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold and the difference value between the second signal strength and the first signal strength is larger than a preset signal strength threshold, reducing the gain of the radio frequency front end by using the baseband processor;
the step of obtaining the signal-to-noise ratio of the anti-blocking receiver by the baseband processor is executed again;
and when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal strength and the first signal strength is greater than the signal strength threshold, the baseband processor is utilized to keep the gain of the radio frequency front end unchanged, and the first signal-to-noise ratio threshold is the demodulation threshold of the baseband processor.
5. The method of claim 4, further comprising:
and when the signal-to-noise ratio is greater than or equal to the second signal-to-noise ratio threshold, controlling the gain of the radio frequency front end to be adjusted to a maximum value by using the baseband processor.
6. The method of claim 4 or 5, wherein reducing the gain of the radio frequency front end using the baseband processor comprises:
reducing the gain of the radio frequency front end by a unity gain; or the like, or, alternatively,
and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
7. A control device for a receiver, applied to the anti-blocking receiver according to any one of claims 1 to 3, the device comprising:
a signal-to-noise ratio obtaining module, configured to obtain, by using the baseband processor, a signal-to-noise ratio of the anti-blocking receiver;
the signal strength acquisition module is used for acquiring first signal strength of an input signal and second signal strength of an output signal of the analog filter by using the RSSI detection module;
a first control module, configured to reduce a gain of the radio frequency front end by using the baseband processor when the signal-to-noise ratio is smaller than a preset first signal-to-noise ratio threshold and a difference between the second signal strength and the first signal strength is greater than a preset signal strength threshold;
a second control module, configured to perform the step of obtaining the snr of the anti-blocking receiver by using the baseband processor again after the gain of the rf front end is reduced by using the baseband processor; and when the signal-to-noise ratio is greater than or equal to the first signal-to-noise ratio threshold and less than a preset second signal-to-noise ratio threshold, and the difference value between the second signal strength and the first signal strength is greater than the signal strength threshold, the baseband processor is utilized to keep the gain of the radio frequency front end unchanged, and the first signal-to-noise ratio threshold is the demodulation threshold of the baseband processor.
8. The apparatus of claim 7, further comprising:
and the third control module is used for controlling the gain of the radio frequency front end to be adjusted to the maximum value by utilizing the baseband processor when the signal-to-noise ratio is greater than or equal to the second signal-to-noise ratio threshold.
9. The apparatus of claim 7 or 8, wherein the first control module is configured to:
reducing the gain of the radio frequency front end by a unity gain; or the like, or, alternatively,
and determining to reduce the gain of the radio frequency front end to a target gain corresponding to the signal-to-noise ratio by using a preset corresponding relation between the signal-to-noise ratio and the gain.
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