CN109756240B - Wireless communication receiver with gain control device and gain control method - Google Patents
Wireless communication receiver with gain control device and gain control method Download PDFInfo
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- CN109756240B CN109756240B CN201910075241.5A CN201910075241A CN109756240B CN 109756240 B CN109756240 B CN 109756240B CN 201910075241 A CN201910075241 A CN 201910075241A CN 109756240 B CN109756240 B CN 109756240B
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Abstract
The invention provides a wireless communication receiver with a gain control device, which comprises a low-noise amplifier, a down converter, a trans-impedance amplifier, a low-pass filter, an analog-to-digital converter, a digital gain control module, a baseband processor and an automatic gain control module, wherein the low-noise amplifier is connected with the down converter; the low-noise amplifier receives a radio frequency signal through an input end; the down converter performs down conversion operation on the radio frequency signal output by the low noise amplifier; the trans-impedance amplifier amplifies the radio frequency signal after the down-conversion operation; the low-pass filter filters the radio frequency signals higher than the cut-off frequency; the analog-to-digital converter converts the radio frequency signal of the analog signal into a radio frequency signal of a digital signal; the digital gain control module performs gain adjustment operation on the radio frequency signal of the digital signal; the baseband processor is used for demodulating and decoding the baseband signal; the automatic gain control module is used for adjusting gain adjusting coefficients of the low noise amplifier, the trans-impedance amplifier, the low pass filter and the digital gain control module.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a wireless communication receiver having a gain control device and a gain control method.
Background
In a wireless communication system, due to uncertainty of the position of a receiver from a transmitter or signal interference, the strength of a signal received by the receiver is uncertain, and the variation range is large. If the gain of the receiver is set to be large, the Digital-to-Analog Converter (ADC) may be saturated, and the signal may not be demodulated correctly; if the gain setting is too small, although the SIGNAL will not saturate, the quantization NOISE increases, the SIGNAL-to-NOISE RATIO (SNR) is too small to meet the demodulation requirements of the baseband, and the performance will deteriorate.
In an Orthogonal Frequency Division Multiplexing (OFDM) based WIFI communication system, since a Peak-to-Average Ratio (PAPR) of a signal is large, a variation range of an input signal is large, and a time reserved for gain adjustment in a system design is short, and it is necessary to complete control adjustment of a gain by about 4us within a half of a short preamble time.
Therefore, a fast automatic gain control device and method are needed to ensure that there is a gain matched with the signal strength of different input signals, so that the signal strength of the signal sent to the baseband demodulation is kept relatively stable, the signal-to-noise ratio is optimal, and good receiving performance is obtained.
Disclosure of Invention
The embodiment of the invention provides a wireless communication receiver with a gain control device and a gain control method, which can carry out rapid automatic gain control; the technical problem that the signal receiving effect of a wireless communication receiver is influenced because the existing automatic gain control method cannot realize quick automatic gain matching is solved.
An embodiment of the present invention provides a wireless communication receiver with a gain control device, including:
the low-noise amplifier is used for receiving a radio-frequency signal through an input end and amplifying the radio-frequency signal to improve the signal-to-noise ratio;
the down converter is used for performing down conversion operation on the radio frequency signal output by the low noise amplifier;
the trans-impedance amplifier is used for amplifying the radio-frequency signal subjected to the down-conversion operation;
a low pass filter for filtering radio frequency signals above a cut-off frequency;
the analog-to-digital converter is used for converting the radio frequency signal of the analog signal into the radio frequency signal of the digital signal;
the digital gain control module is used for carrying out gain adjustment operation on the radio frequency signal of the digital signal so as to generate a corresponding baseband signal;
a baseband processor for demodulating and decoding the baseband signal; and
and the automatic gain control module is respectively connected with the low-noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module and is used for adjusting gain adjusting coefficients of the low-noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module.
In the wireless communication receiver with the gain control device according to the present invention, the wireless communication receiver includes a plurality of low pass filters provided between the transimpedance amplifier and the analog-to-digital converter.
In the wireless communication receiver with the gain control device, the low noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module are provided with a plurality of levels of gain adjustment; the gain adjustment amount of each stage of the low-noise amplifier is larger than the gain adjustment amount of each stage of the trans-impedance amplifier, the low-pass filter and the digital gain control module.
In the wireless communication receiver with the gain control device of the present invention, when the wireless communication receiver receives a new radio frequency signal, the low noise amplifier, the transimpedance amplifier, the low pass filter, and the digital gain control module are all set to the maximum gain adjustment amount.
An embodiment of the present invention further provides a gain control method using the wireless communication receiver, including:
A. judging whether a radio frequency signal is received, and if the radio frequency signal is received, turning to the step B;
B. the automatic gain control module detects power output states of the low-noise amplifier, the trans-impedance amplifier and the low-pass filter; wherein the low noise amplifier, the transimpedance amplifier, and the low pass filter are all at a maximum gain adjustment;
C. if the low noise amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low noise amplifier, waits for a set time period and returns to the step B; if the transimpedance amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage transimpedance amplifier, waits for a set time period and returns to the step B; if the low-pass filter is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low-pass filter, waits for a set time period and returns to the step B;
D. if the low-noise amplifier, the transimpedance amplifier and the low-pass filter are not in a power saturation state, the automatic gain control module performs analog signal gain adjustment on the radio-frequency signal output by the low-pass filter according to a set target power;
E. the analog-to-digital converter converts the radio-frequency signal subjected to the analog signal gain adjustment into a digital signal;
F. the digital gain control module performs digital signal gain adjustment on the radio-frequency signal converted into the digital signal to generate a corresponding baseband signal;
G. the baseband processor demodulates and decodes the baseband signal.
In the gain control method of a wireless communication receiver according to the present invention, the step of determining whether a radio frequency signal is received includes:
detecting an output radio frequency signal of the analog-to-digital converter, and judging whether the output radio frequency signal of the analog-to-digital converter meets a set condition within a set time period;
if the output radio frequency signal of the analog-to-digital converter meets the set condition, determining that the radio frequency signal is received; otherwise, returning to the step of detecting the output radio frequency signal.
In the gain control method of a wireless communication receiver according to the present invention, the step of determining whether an output rf signal of the adc satisfies a predetermined condition within a predetermined time period includes:
and in a set time period, the time length of the output radio frequency signal of the analog-to-digital converter being greater than a set threshold value is greater than a preset value, and then the output radio frequency signal of the analog-to-digital converter is determined to meet a set condition.
In the gain control method of the wireless communication receiver, the time length of the output radio frequency signal of the analog-to-digital converter, which is greater than the set threshold value, is judged to be greater than the preset value according to the counting result of the counter.
In the gain control method of a wireless communication receiver according to the present invention, the low noise amplifier has two stages of gain adjustment amounts, the gain adjustment amount of each stage being 15 db; the trans-impedance amplifier and the low-pass filter are provided with three levels of gain adjustment quantity, and the gain adjustment quantity of each level is 6 db.
In the gain control method of the wireless communication receiver, the digital gain control module performs digital signal gain adjustment with 2db as a gain adjustment amplitude.
Compared with the prior art, the wireless communication receiver with the gain control device and the gain control method have the advantages that the automatic gain control module simultaneously adjusts the gain adjusting coefficient of the low-noise amplifier, the trans-impedance amplifier, the low-pass filter and the digital gain control module; thereby, fast automatic gain control of a wireless communication receiver can be achieved; the technical problem that the signal receiving effect of a wireless communication receiver is influenced because the existing automatic gain control method cannot realize quick automatic gain matching is effectively solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a wireless communication receiver with a gain control device according to the present invention;
fig. 2 is a flow chart of an embodiment of a gain control method of a wireless communication receiver of the present invention;
fig. 3 is a flowchart of a method for performing gain control in a wireless communication receiver according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The wireless communication receiver with the gain control device can be used for various wireless communication receiver architectures, so that the wireless communication receiver can quickly and accurately realize the gain matching of the received signal.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless communication receiver with a gain control device according to an embodiment of the present invention. The wireless communication receiver 10 includes a low noise amplifier 11, a down-converter 12, a transimpedance amplifier 13, a low pass filter 14, an analog-to-digital converter 15, a digital gain control module 16, a baseband processor 17, and an automatic gain control module 18.
The low-noise amplifier 11 is used for receiving the radio-frequency signal through the input end and amplifying the radio-frequency signal to improve the signal-to-noise ratio; the down converter 12 is used for performing down conversion operation on the radio frequency signal output by the low noise amplifier; the transimpedance amplifier 13 is configured to perform an amplification operation on the radio frequency signal after the down-conversion operation; the low-pass filter 14 is used for filtering radio frequency signals above a cut-off frequency; the analog-to-digital converter 15 is configured to convert a radio frequency signal of the analog signal into a radio frequency signal of the digital signal; the digital gain control module 16 is configured to perform a gain adjustment operation on a radio frequency signal of the digital signal to generate a corresponding baseband signal; the baseband processor 17 is used for demodulating and decoding the baseband signal; the automatic gain control module 18 is respectively connected to the low noise amplifier 11, the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16, and is configured to adjust gain adjustment coefficients of the low noise amplifier 11, the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16.
Preferably, a plurality of low pass filters 14 may be disposed between the transimpedance amplifier 13 and the analog-to-digital converter 15 to increase the overall gain adjustment range of the wireless communication receiver 10.
The low noise amplifier 11, the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16 are provided with a plurality of levels of gain adjustment amounts so as to adjust signal gains; the gain adjustment amount of each stage of the low noise amplifier 11 is greater than the gain adjustment amount of each stage of the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16, so that the low noise amplifier 11 performs coarse gain adjustment, and the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16 perform fine gain adjustment, wherein the gain adjustment accuracy of the transimpedance amplifier 13 and the low pass filter 14 is less than the gain adjustment accuracy of the digital gain control module 16, so as to ensure the stability of the radio frequency signal output by the digital gain control module 16.
When the wireless communication receiver 10 of the present embodiment is used, when the wireless communication receiver 10 receives a new radio frequency signal, the low noise amplifier 11, the transimpedance amplifier 13, the low pass filter 14 and the digital gain control module 16 are all set to the maximum gain adjustment amount, so that the digital gain control module 16 can generate the maximum gain output under the premise that the analog-to-digital converter 15 is not saturated.
Referring to fig. 2, fig. 2 is a flowchart illustrating an embodiment of a gain control method of a wireless communication receiver 10 according to the present invention. The gain control method comprises the following steps:
step S201, the wireless communication receiver judges whether a radio frequency signal is received, if the radio frequency signal is received, the step S202 is carried out, and if the radio frequency signal is not received, the radio frequency signal continues to be detected;
step S202, the automatic gain control module detects power output states of the low noise amplifier, the trans-impedance amplifier and the low pass filter; wherein the low noise amplifier, the trans-impedance amplifier and the low pass filter are all in the maximum gain adjustment amount;
step S203, if the low noise amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-level low noise amplifier, waits for a set time period and returns to the step S202; if the transimpedance amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage transimpedance amplifier, waits for a set time period and returns to the step S202; if the low-pass filter is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low-pass filter, waits for a set time period and returns to the step S202; if the low-noise amplifier, the trans-impedance amplifier and the low-pass filter are not in a power saturation state, the automatic gain control module performs analog signal gain adjustment on the radio-frequency signal output by the low-pass filter according to the set target power;
step S204, the analog-to-digital converter converts the radio frequency signal after the analog signal gain adjustment into a digital signal;
step S205, the digital gain control module performs digital signal gain adjustment on the radio frequency signal converted into the digital signal to generate a corresponding baseband signal;
in step S206, the baseband processor demodulates and decodes the baseband signal.
The following describes in detail the signal gain adjustment control flow of the wireless communication receiver of the present embodiment.
In step S201, the wireless communication receiver determines whether a radio frequency signal is received. The wireless communication receiver detects the output radio frequency signal of the analog-to-digital converter and determines whether the radio frequency signal is received by judging whether the output radio frequency signal of the analog-to-digital converter meets a set condition within a set time period.
When the output radio frequency signal of the analog-to-digital converter meets the set condition, the received radio frequency signal is determined; if the output radio frequency signal of the analog-to-digital converter does not meet the set condition, the radio frequency signal is not received, and the step of detecting the output radio frequency signal of the analog-to-digital converter is returned.
The set condition here may be that the length of time that the output rf signal of the analog-to-digital converter is greater than the set threshold is greater than a predetermined value within a set time period, and the counting result of the counter may be used to determine the length of time that the output rf signal of the analog-to-digital converter is greater than the set threshold.
If the analog-to-digital converter is a 12-bit analog-to-digital converter, and the digital representation range of the signal intensity of the radio-frequency signal output by the analog-to-digital converter is-2048 to 2047, the set threshold of the signal intensity of the output radio-frequency signal can be 256, if the signal intensity of the output radio-frequency signal of the analog-to-digital converter is greater than 256 for 1 microsecond, the counting result of the counter is increased by 1, and if the counting result of the counter is greater than 10, the radio-frequency signal is received by the wireless communication receiver; then go to step S202, otherwise continue to detect the rf signal.
In step S202, the automatic gain control module detects power output states of the low noise amplifier, the transimpedance amplifier, and the low pass filter to perform gain adjustment on the low noise amplifier, the transimpedance amplifier, and the low pass filter. The gain initial states of the low-noise amplifier, the trans-impedance amplifier and the low-pass filter are all at the maximum gain adjustment quantity.
In step S203, if the low noise amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment amount of the first-level low noise amplifier, waits for a set time period, and returns to step S202; the low noise amplifier has two-stage gain adjustment amount, and the gain adjustment amount of each stage is 15 db;
if the transimpedance amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage transimpedance amplifier, waits for a set time period and returns to the step S202; the trans-impedance amplifier has three stages of gain adjustment amounts, and the gain adjustment amount of each stage is 6 db;
if the low-pass filter is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low-pass filter, waits for a set time period and returns to the step S202; the low-pass filter has three stages of gain adjustment amounts, and the gain adjustment amount of each stage is 6 db;
the automatic gain control module can simultaneously adjust the gain of the low noise amplifier, the trans-impedance amplifier and the low pass filter, so that the analog-to-digital converter can output stable radio frequency signals as soon as possible.
If the low-noise amplifier, the trans-impedance amplifier and the low-pass filter are not in a power saturation state, the automatic gain control module performs analog signal gain adjustment on the radio-frequency signal output by the low-pass filter according to the set target power. The analog signal gain adjustment can be performed on the output radio frequency signal by arranging a multi-stage low-pass filter, so that the analog-to-digital converter can generate the maximum gain output under the unsaturated condition.
In step S204, the analog-to-digital converter converts the analog signal output by the low-pass filter into a digital signal after gain adjustment.
In step S205, the digital gain control module performs digital signal gain adjustment on the rf signal converted into the digital signal in step S204, where the digital gain control module performs digital signal gain adjustment with 2db as a gain adjustment amplitude, so that the rf signal of the adjusted digital signal can be as close as possible to the set target power, thereby generating a corresponding baseband signal.
In step S206, the baseband processor performs demodulation and decoding operations on the baseband signal generated in step S205.
Thus, the signal gain adjustment control flow of the signal gain adjustment method of the wireless communication receiver of the present embodiment is completed.
In the wireless communication receiver with the gain control device and the gain control method of the embodiment, the automatic gain control module simultaneously adjusts the gain adjustment coefficients of the low noise amplifier, the transimpedance amplifier, the low pass filter and the digital gain control module; fast automatic gain control of a wireless communication receiver may thus be achieved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for performing gain control in a wireless communication receiver according to an embodiment of the invention. The structure of the wireless communication receiver according to the present embodiment is shown in fig. 1. The radio frequency signal input by the wireless communication receiver has a power ranging from-100 dbm to 10 dbm. In order to be able to properly interpret the radio frequency signal, the radio frequency signal input to the baseband processor needs to have a power in the range of-10 dbm. Therefore, the wireless communication receiver can perform gain adjustment on radio frequency signals in five modules, namely a low-noise amplifier, a transimpedance amplifier, a first low-pass filter, a second low-pass filter and a digital gain control module, in the embodiment, the gain adjustment ranges of the low-noise amplifier, the transimpedance amplifier, the first low-pass filter, the second low-pass filter and the digital gain control module are respectively 30db, 18db and 30db, so that the wireless communication receiver can provide a gain adjustment range of 114db, and thus, the requirements of input radio frequency signals with different powers are met.
The process of performing gain control in the wireless communication receiver of the present embodiment includes:
step S301, when the wireless communication receiver is in an idle state, the low noise amplifier, the transimpedance amplifier, the first low pass filter, and the second low pass filter are all in the maximum gain adjustment amount.
And then determining whether the wireless communication receiver needs to prepare to receive the radio frequency signal according to the counting result of the counter, and if the signal strength of the radio frequency signal output by the analog-to-digital converter is greater than 256 for 10 microseconds, and the counting result of the counter is equal to 10, determining that the wireless communication receiver receives the radio frequency signal.
Step S302, an automatic gain control module detects whether a low noise amplifier, a trans-impedance amplifier, a first low pass filter and a second low pass filter are in a power saturation state, if so, the automatic gain control module is in the power saturation state, and reduces a first-level gain adjustment amount, the low noise amplifier reduces 15db, and the trans-impedance amplifier, the first low pass filter and the second low pass filter reduces 6 db; after waiting a set time period, re-executing step S302; if none is in the power saturation state, the process goes to step S303.
Step S303, the low noise amplifier, the transimpedance amplifier, the first low pass filter, and the second low pass filter are not in a power saturation state, and the automatic gain control module performs analog signal gain adjustment on the radio frequency signal according to a difference between a set target power and a power of the radio frequency signal output by the second low pass filter.
In step S304, the analog-to-digital converter converts the rf signal output by the low-pass filter after the analog signal gain adjustment into a digital signal.
Step S305, the digital gain control module performs digital signal gain fine adjustment on the rf signal converted into the digital signal in step S304, where the digital gain control module performs digital signal gain fine adjustment with a gain fine adjustment amplitude of 2db to generate a corresponding baseband signal, so that the generated baseband signal can be as close to a set target power as possible, and then jumps to a gain holding state.
In step S306, the baseband signal gain adjustment is already stable, and the baseband processor demodulates and decodes the baseband signal until the current data reception is completed, and then returns to the idle state in step S301.
This completes the procedure of performing gain control in the wireless communication receiver according to the present embodiment.
In the wireless communication receiver with the gain control device and the gain control method, the automatic gain control module simultaneously adjusts the gain adjusting coefficient of the low noise amplifier, the trans-impedance amplifier, the low pass filter and the digital gain control module; thereby, fast automatic gain control of a wireless communication receiver can be achieved; the technical problem that the signal receiving effect of a wireless communication receiver is influenced because the existing automatic gain control method cannot realize quick automatic gain matching is effectively solved.
As used herein, the terms "component," "module," "system," "interface," "process," and the like are generally intended to refer to a computer-related entity: hardware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a controller and the controller can be a component. One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers.
Various operations of embodiments are provided herein. In one embodiment, the one or more operations may constitute computer readable instructions stored on one or more computer readable media, which when executed by an electronic device, will cause the computing device to perform the operations. The order in which some or all of the operations are described should not be construed as to imply that these operations are necessarily order dependent. Those skilled in the art will appreciate alternative orderings having the benefit of this description. Moreover, it should be understood that not all operations are necessarily present in each embodiment provided herein.
Also, as used herein, the word "preferred" is intended to serve as an example, instance, or illustration. Any aspect or design described herein as "preferred" is not necessarily to be construed as advantageous over other aspects or designs. Rather, use of the word "preferred" is intended to present concepts in a concrete fashion. The term "or" as used in this application is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise or clear from context, "X employs A or B" is intended to include either of the permutations as a matter of course. That is, if X employs A; b is used as X; or X employs both A and B, then "X employs A or B" is satisfied in any of the foregoing examples.
Also, although the disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present disclosure includes all such modifications and alterations, and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the disclosure. In addition, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for a given or particular application. Furthermore, to the extent that the terms "includes," has, "" contains, "or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term" comprising.
Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Each apparatus or system described above may perform the method in the corresponding method embodiment.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (9)
1. A wireless communication receiver having gain control means, comprising:
the low-noise amplifier is used for receiving a radio-frequency signal through an input end and amplifying the radio-frequency signal to improve the signal-to-noise ratio;
the down converter is used for performing down conversion operation on the radio frequency signal output by the low noise amplifier;
the trans-impedance amplifier is used for amplifying the radio-frequency signal subjected to the down-conversion operation;
a low pass filter for filtering radio frequency signals above a cut-off frequency;
the analog-to-digital converter is used for converting the radio frequency signal of the analog signal into the radio frequency signal of the digital signal;
the digital gain control module is used for carrying out gain adjustment operation on the radio frequency signal of the digital signal so as to generate a corresponding baseband signal;
a baseband processor for demodulating and decoding the baseband signal; and
the automatic gain control module is respectively connected with the low-noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module and is used for adjusting gain adjusting coefficients of the low-noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module;
the low-noise amplifier, the transimpedance amplifier, the low-pass filter and the digital gain control module are provided with a plurality of levels of gain adjustment amounts, the gain adjustment amount of each level of the low-noise amplifier is larger than the gain adjustment amount of each level of the transimpedance amplifier, the low-pass filter and the digital gain control module, so that the low-noise amplifier can carry out coarse gain adjustment, the transimpedance amplifier, the low-pass filter and the digital gain control module can carry out fine gain adjustment, and the gain adjustment accuracy of the transimpedance amplifier and the low-pass filter is smaller than the gain adjustment accuracy of the digital gain control module, so that the stability of the radio-frequency signal output by the digital gain control module is ensured.
2. The wireless communication receiver with gain control apparatus of, wherein said wireless communication receiver comprises a plurality of low pass filters disposed between said transimpedance amplifier and said analog-to-digital converter.
3. The wireless communication receiver with gain control apparatus of claim 1, wherein the low noise amplifier, the transimpedance amplifier, the low pass filter, and the digital gain control module are all set to a maximum gain adjustment when a new radio frequency signal is received by the wireless communication receiver.
4. A method of gain control in a wireless communication receiver as recited in claims 1-3, comprising:
A. judging whether a radio frequency signal is received, and if the radio frequency signal is received, turning to the step B;
B. the automatic gain control module detects power output states of the low-noise amplifier, the trans-impedance amplifier and the low-pass filter; wherein the low noise amplifier, the transimpedance amplifier, and the low pass filter are all at a maximum gain adjustment;
C. if the low noise amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low noise amplifier, waits for a set time period and returns to the step B; if the transimpedance amplifier is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage transimpedance amplifier, waits for a set time period and returns to the step B; if the low-pass filter is in a power saturation state, the automatic gain control module reduces the gain adjustment quantity of the first-stage low-pass filter, waits for a set time period and returns to the step B;
D. if the low-noise amplifier, the transimpedance amplifier and the low-pass filter are not in a power saturation state, the automatic gain control module performs analog signal gain adjustment on the radio-frequency signal output by the low-pass filter according to a set target power;
E. the analog-to-digital converter converts the radio-frequency signal subjected to the analog signal gain adjustment into a digital signal;
F. the digital gain control module performs digital signal gain adjustment on the radio-frequency signal converted into the digital signal to generate a corresponding baseband signal;
G. the baseband processor demodulates and decodes the baseband signal.
5. The method of claim 4, wherein the step of determining whether a radio frequency signal is received comprises:
detecting an output radio frequency signal of the analog-to-digital converter, and judging whether the output radio frequency signal of the analog-to-digital converter meets a set condition within a set time period;
if the output radio frequency signal of the analog-to-digital converter meets the set condition, determining that the radio frequency signal is received; otherwise, returning to the step of detecting the output radio frequency signal.
6. The method as claimed in claim 5, wherein the step of determining whether the output rf signal of the adc satisfies a predetermined condition within a predetermined time period comprises:
and in a set time period, the time length of the output radio frequency signal of the analog-to-digital converter being greater than a set threshold value is greater than a preset value, and then the output radio frequency signal of the analog-to-digital converter is determined to meet a set condition.
7. The method as claimed in claim 6, wherein the length of time that the output rf signal of the adc is greater than the predetermined value is determined according to the counting result of the counter.
8. The gain control method of a wireless communication receiver of claim 4, wherein the low noise amplifier has two stages of gain adjustment, each stage having a gain adjustment of 15 db; the trans-impedance amplifier and the low-pass filter are provided with three levels of gain adjustment quantity, and the gain adjustment quantity of each level is 6 db.
9. The method of claim 4, wherein the digital gain control module performs digital signal gain adjustment with a gain adjustment magnitude of 2 db.
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| WO2021042326A1 (en) * | 2019-09-05 | 2021-03-11 | 深圳市速腾聚创科技有限公司 | Laser radar signal receiving circuit, laser radar signal gain control method, and laser radar |
| CN110365302B (en) * | 2019-06-14 | 2023-03-28 | 中国人民解放军空军工程大学 | Automatic gain control method and device for communication system |
| CN110545116A (en) * | 2019-07-16 | 2019-12-06 | 广州润芯信息技术有限公司 | Receiver double-loop automatic gain control method, electronic equipment, medium and device |
| CN113765531B (en) * | 2020-06-02 | 2022-08-16 | 广州海格通信集团股份有限公司 | Automatic gain control method and device for receiving link and computer equipment |
| CN113517873A (en) * | 2021-07-06 | 2021-10-19 | 北京奕斯伟计算技术有限公司 | Control circuit, control method and storage medium of signal gain |
| CN113904694A (en) * | 2021-10-29 | 2022-01-07 | 上海力通通信有限公司 | Gain control circuit, device and radio frequency signal processing system |
| CN114374401A (en) * | 2021-12-18 | 2022-04-19 | 武汉力通通信有限公司 | Automatic gain control radio frequency receiver |
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