CN203039920U - Radio frequency link gain automatic control device - Google Patents
Radio frequency link gain automatic control device Download PDFInfo
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- CN203039920U CN203039920U CN 201220371258 CN201220371258U CN203039920U CN 203039920 U CN203039920 U CN 203039920U CN 201220371258 CN201220371258 CN 201220371258 CN 201220371258 U CN201220371258 U CN 201220371258U CN 203039920 U CN203039920 U CN 203039920U
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Abstract
The utility model provides a radio frequency link gain automatic control device, comprising a processor, respectively electrically connected with a first digital attenuator, a second digital attenuator, a third digital attenuator, a simulation down converter, an analog-digital converter, a field-programmable gate array, a digital analog converter, and a simulation up-converter. The first digital attenuator and the second digital attenuator are respectively connected with the simulation down converter. The simulation down converter, the analog-digital converter, the field-programmable gate array, the digital analog converter, the simulation up-converter, and the third digital attenuator are connected in sequence. Through combining link gain control, feedback channel signal power regulation control and signal level control, the device effectively controls gain of a whole radio frequency link, thereby providing gain controlled output signals for post-level signal processing modules.
Description
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a device and a method for realizing Automatic Gain Control (AGC) of a wireless radio frequency signal.
Background
In a wireless signal coverage system, due to the influence of factors such as power loss of wireless radio frequency signals, multipath fading and the like, the strength of signals received by a receiving front end of the wireless signal coverage system is different, and if the received signals are too large, the linear amplification range of the system can be exceeded; where the received signal is weak, it may be difficult to identify. Meanwhile, the wireless signal coverage system also requires that the adjacent channel and the secondary adjacent channel of the radio frequency transmitting front end in the specified frequency band range have smaller power leakage, and the efficiency of the output channel power amplifier is higher. This requires a large dynamic range of reception and a high efficiency of the transmission power amplifier over the entire rf link.
The traditional radio frequency gain Automatic control method mostly adopts an analog power detection circuit, and if a received signal is detected to be too large, the value of an Automatic Gain Control (AGC) of an amplifier is reduced; if the received signal is detected to be too small, the amplifier gain value is adjusted high. Or, the intermediate frequency or the baseband is digitized by the receiver, and the gain control feedback signal is directly obtained. It is not ideal in overall link gain control effect; and only a single signal channel, that is, only one of the input or output signals is subjected to automatic gain adjustment, thereby affecting the coverage effect of the wireless signal coverage system.
Disclosure of Invention
In view of the above problem, the present invention provides an apparatus and a method for automatically controlling gain of a radio frequency link to improve the performance of a wireless signal coverage system.
In order to achieve the above object, the present invention provides an automatic gain control device for a radio frequency link, the device comprising:
the microprocessor is respectively and electrically connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator, the analog down converter, the analog-to-digital converter, the field programmable gate array, the digital-to-analog converter and the analog up converter; the first numerical control attenuator and the second numerical control attenuator are respectively connected with the analog down converter; the analog down converter, the analog-to-digital converter, the field programmable gate array, the digital-to-analog converter, the analog up converter and the third numerical control attenuator are connected in sequence; wherein,
the field programmable gate array comprises a first subtracter, a second subtracter and a reference register;
the microprocessor is used for driving and controlling the working state of the device connected with the microprocessor;
the first digital control attenuator is an input gain controller and is used for providing a gain control value for an input channel, and the gain adjustment value of the input channel is obtained by calculation of a first subtracter;
the second digital control attenuator is a feedback gain controller and is used for providing a gain control value for a feedback channel, and the gain adjustment value of the feedback channel is obtained by calculation of a second subtracter;
the third numerical control attenuator is an output gain controller and is used for providing a gain control value for an output channel, and the gain adjustment value of the output channel is obtained from the field programmable gate array; and
the analog down converter is used for carrying out frequency mixing processing on the input and feedback signals and converting the input and feedback signals into analog intermediate frequency signals; the analog-to-digital converter is used for converting the analog intermediate frequency signal into a digital intermediate frequency signal and detecting an input signal power value and a feedback signal power value; the field programmable gate array is used for dynamically calculating the received signal power value and transmitting the dynamic gain adjustment value to the first numerical control attenuator, the second numerical control attenuator and the third numerical control attenuator; the digital-to-analog converter is used for performing digital-to-analog conversion on the digital signal output by the field programmable gate array, sequentially processing the digital signal by the analog up-converter and the third numerical control attenuator and outputting a gain-controlled radio frequency signal; the input end of the first numerical control attenuator is used as the input signal input end of the radio frequency link gain automatic control device; the input end of the second numerical control attenuator is used as the feedback signal input end of the radio frequency link gain automatic control device; and the output end of the third numerical control attenuator is used as the output end of the automatic gain control device of the radio frequency link.
The invention introduces the input gain control, the output gain control and the feedback gain adjustment mode, so that the gain level of the whole radio frequency link is effectively controlled. The input gain control enables the analog-to-digital converter to work in the optimal dynamic range, and a better signal source is provided for subsequent intermediate frequency or baseband digital signal processing; the output gain control can improve the efficiency of the rear-stage power amplifier and avoid the damage of the rear-stage power amplifier by detecting the input signal and adjusting the power of the output signal; the feedback gain adjustment is realized by detecting the power of a feedback signal and finely adjusting the gain of an output signal, so that the gain control precision is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an automatic gain control device for a radio frequency link according to the present invention;
fig. 2 is a schematic system structure diagram of an automatic gain control device for a radio frequency link according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of the automatic gain control method for RF link according to the present invention
Wherein:
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the automatic gain control device 1 for a radio frequency link according to the present invention includes: the microprocessor 20 is respectively electrically connected with the first numerical control attenuator 9, the second numerical control attenuator 10, the third numerical control attenuator 19, the analog down converter 11, the analog-to-digital converter 12, the field programmable gate array 13, the digital-to-analog converter 17 and the analog up converter 18; the first numerical control attenuator 9 and the second numerical control attenuator 10 are respectively connected with an analog down converter 11; the analog down converter 11, the analog-to-digital converter 12, the field programmable gate array 13, the digital-to-analog converter 17, the analog up converter 18 and the third numerical control attenuator 19 are connected in sequence; wherein,
a field programmable gate array 13 including a first subtractor 15, a second subtractor 16, and a reference register 14;
and a microprocessor 20 for driving and controlling the operation state of the devices connected thereto, wherein the microprocessor 20 can control the operation of other devices or modules in the device through corresponding pins and circuits thereof.
The first numerical control attenuator 9 is an input gain controller and is used for providing a gain control value for an input channel, and the gain adjustment value of the input channel is obtained by calculation of a first subtracter 15;
the second digital controlled attenuator 10 is a feedback gain controller, and is used for providing a gain control value for a feedback channel, and a gain adjustment value of the feedback channel is calculated and obtained by a second subtracter 16;
a third digital control attenuator 19, which is an output gain controller, for providing a gain control value to the output channel, and the gain adjustment value of the output channel is obtained from the field programmable gate array 13; and
the analog down converter 11 performs frequency mixing processing on the input and feedback signals, converts the input and feedback signals into analog intermediate frequency signals, and transmits the analog intermediate frequency signals to the analog-to-digital converter 12, and the digital-to-analog converter 12 adopts dual-channel input and has a power counter function, so that the analog intermediate frequency signals can be converted into digital intermediate frequency signals, and an input signal power value P1 and a feedback signal power value P2 can be detected. The digital intermediate frequency signal processed by the analog-to-digital converter 12 enters a Field Programmable Gate Array (FPGA)13 for dynamic gain adjustment value calculation, the first subtracter 15 calculates the dynamic gain adjustment value of the input channel and feeds the dynamic gain adjustment value back to the first numerical control attenuator 9, the second subtracter 16 calculates the dynamic gain adjustment value of the feedback channel and feeds the dynamic gain adjustment value back to the second numerical control attenuator 10, dynamic gain adjustment of the signals of the input channel and the feedback channel is realized, and the signals entering the analog-to-digital converter 12 are ensured not to overflow. Meanwhile, the fpga 13 integrates the dynamic gain adjustment values of the input channel and the feedback channel to obtain the dynamic gain adjustment value of the output channel correspondingly. The digital intermediate frequency signal output by the field programmable gate array 13 is converted into an analog output intermediate frequency signal by the digital-to-analog converter 17, and is converted into an output radio frequency signal by the analog up-converter 18, and the output radio frequency signal enters the third numerical control attenuator 19. The third digital control attenuator 19 completes the adjustment of the output signal power according to the dynamic gain adjustment value of the output channel, and realizes the automatic gain control function of the radio frequency link.
The input end of the first numerical control attenuator 9 is used as the input signal input end of the radio frequency link gain automatic control device 1; the input end of the second digital controlled attenuator 10 is used as the feedback signal input end of the radio frequency link gain automatic control device 1; the output end of the third digitally controlled attenuator 19 serves as the output end of the automatic gain control device 1 for the radio frequency link and outputs a gain-controlled radio frequency signal.
Referring to fig. 2, a schematic diagram of a preferred embodiment of the present invention is shown, in a wireless signal coverage system such as a digital repeater and a Radio Remote Unit (RRU), a radio link automatic gain control device 1 according to the present invention is connected to a power amplification module 2 and a digital signal processing unit 6, the power amplification module 2 is connected to a coupler 3, a duplex filter 4 and an antenna 5 in sequence to form the wireless signal coverage system, and a transmitting end of the antenna 5 is used as an output end of a system signal. It is understood that the wireless signal coverage system also includes a monitoring module 7, a power supply module 8, and the like. The radio frequency input signal and the feedback signal are respectively input into the automatic gain control module 1 of the radio frequency link through two ports, and the radio frequency output signal with controlled gain is output after being processed. The signal enters a coupler 3 after being amplified by a power amplification module 2, and a radio frequency output signal is output through a main output end of the coupler 3 and is transmitted out through a duplex filter 4 and an antenna 5; meanwhile, a small amount of coupled signals are fed back to the automatic gain control module 1 of the radio frequency link through the auxiliary output end to be used as feedback control of gain.
The radio frequency link automatic gain control device 1 is connected with the digital signal processing unit 6 to realize information interaction of baseband signals, and when the digital signal processing module 6 performs processing such as digital up/down conversion (DUC \ DDC), Digital Predistortion (DPD), peak Clipping (CFR), echo cancellation (ICS) and the like, the radio frequency link automatic gain control device 1 provided by the invention can be more efficient in providing a gain-controlled high-quality information source. The radio frequency signal output to the rear-stage power amplification module 2 by the radio frequency link automatic gain control device 1 is gain-controlled, so that the efficiency of the power amplification module 2 can be improved.
The automatic control method of the gain of the radio frequency link according to the present invention will be described in detail with reference to figure 3,
step A: when power-on initialization is carried out, according to a field application environment, default gain values of a first numerical control attenuator, a second numerical control attenuator and a third numerical control attenuator, and a reference power P0, a power start-up threshold Pth and a buffer threshold Pn of a register in a field programmable array are configured in advance; the reference power P0 is a reference power value, the power control threshold Pth is used to set a signal power threshold, and the buffer threshold Pn is used to set a gain adjustment step;
and B: the analog-to-digital converter detects an input signal and a feedback signal according to a set sampling frequency, converts the analog signal into a digital signal, and detects an input signal power value P1 and a feedback signal power value P2;
and C: determining whether the input signal power P1 is greater than a power activation threshold Pth configured in the field programmable array,
if the dynamic gain adjustment value is larger than the preset value, the dynamic gain adjustment value delta DCA1 of the input channel is obtained through calculation according to delta DCA 1-P1-P0 by a first subtracter in a field programmable gate array, the dynamic gain adjustment value delta DCA2 of the feedback channel is obtained through calculation according to delta DCA 2-P2-Pth by a second subtracter in the field programmable gate array, and the dynamic gain adjustment value delta DCA3 of the output channel is obtained through calculation according to delta DCA 3-DCA 2 by the field programmable gate array;
otherwise, the dynamic gain adjustment value Δ DCA1 of the input channel is obtained by calculating according to DCA1 ═ P1-P0 through a first subtracter in the field programmable gate array, the dynamic gain adjustment value Δ DCA2 of the feedback channel is obtained by calculating according to Δ DCA2 ═ P2-P1 through a second subtracter in the field programmable gate array, and the dynamic gain adjustment value Δ DCA3 of the output channel is obtained by calculating according to Δ DCA3 ═ Δ DCA1+ Δ DCA2 through the field programmable gate array;
step D: determining whether the dynamic gain adjustment value Δ DCA1 of the input channel is greater than a buffer threshold Pn configured in the field programmable array,
if the dynamic gain adjustment value is larger than the preset dynamic gain adjustment value, adjusting the gain value of the first numerical control attenuator according to the dynamic gain adjustment value delta DCA1 to achieve the purpose of adjusting the power of the input signal; otherwise, directly entering the step E;
step E: determining whether the dynamic gain adjustment value Δ DCA2 of the feedback channel is greater than a buffer threshold Pn configured in the field programmable array,
if the dynamic gain adjustment value is larger than the preset dynamic gain adjustment value, the gain value of the second digital controlled attenuator is adjusted according to the dynamic gain adjustment value delta DCA2, and the purpose of adjusting the power of the feedback signal is achieved; otherwise, directly entering the step F;
step F: determining whether the dynamic gain adjustment value Δ DCA3 of the output channel is greater than the buffer threshold Pn configured in the field programmable array,
if the dynamic gain adjustment value is larger than the dynamic gain adjustment value delta DCA3, adjusting the gain value of the third numerical control attenuator to achieve the purpose of adjusting the power of the output signal, and outputting the adjusted radio frequency output signal from the output end; otherwise, returning to the step B, and continuously detecting the input and feedback signals.
And F, amplifying the radio frequency output signal output by the output end of the third numerical control attenuator in the step F through a power amplification module, sequentially processing the radio frequency output signal by the main output end of the coupler and the duplex filter, and transmitting the radio frequency output signal through an antenna.
The above description is only a preferred embodiment and any simple modifications or alterations within the scope of the present patent disclosure are covered by the protection scope of the present patent. Therefore, the protection scope of this patent shall be subject to the protection scope of the claims.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (4)
1. An apparatus for automatic gain control of a radio frequency link, said apparatus comprising:
the microprocessor is respectively and electrically connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator, the analog down converter, the analog-to-digital converter, the field programmable gate array, the digital-to-analog converter and the analog up converter; the first numerical control attenuator and the second numerical control attenuator are respectively connected with the analog down converter; the analog down converter, the analog-to-digital converter, the field programmable gate array, the digital-to-analog converter, the analog up converter and the third numerical control attenuator are connected in sequence; wherein,
the field programmable gate array comprises a first subtracter, a second subtracter and a reference register;
the microprocessor is used for driving and controlling the working state of the device connected with the microprocessor;
the first digital control attenuator is an input gain controller and is used for providing a gain control value for an input channel, and the gain adjustment value of the input channel is obtained by calculation of a first subtracter;
the second digital control attenuator is a feedback gain controller and is used for providing a gain control value for a feedback channel, and the gain adjustment value of the feedback channel is obtained by calculation of a second subtracter;
the third numerical control attenuator is an output gain controller and is used for providing a gain control value for an output channel, and the gain adjustment value of the output channel is obtained from the field programmable gate array; and
the analog down converter is used for carrying out frequency mixing processing on the input and feedback signals and converting the input and feedback signals into analog intermediate frequency signals; the analog-to-digital converter is used for converting the analog intermediate frequency signal into a digital intermediate frequency signal and detecting an input signal power value and a feedback signal power value; the field programmable gate array is used for dynamically calculating the received signal power value and transmitting the dynamic gain adjustment value to the first numerical control attenuator, the second numerical control attenuator and the third numerical control attenuator; the digital-to-analog converter is used for performing digital-to-analog conversion on the digital signal output by the field programmable gate array, sequentially processing the digital signal by the analog up-converter and the third numerical control attenuator and outputting a gain-controlled radio frequency signal; the input end of the first numerical control attenuator is used as the input signal input end of the radio frequency link gain automatic control device; the input end of the second numerical control attenuator is used as the feedback signal input end of the radio frequency link gain automatic control device; and the output end of the third numerical control attenuator is used as the output end of the automatic gain control device of the radio frequency link.
2. The apparatus according to claim 1, wherein the field programmable gate array is connected to the digital signal processing module to realize information interaction of baseband signals.
3. The apparatus of claim 1 wherein the analog-to-digital converter uses a dual channel input and functions as a power counter.
4. The automatic control device for gain of radio frequency link according to claim 1, wherein the field programmable gate array is connected to the digital signal processing module, the output terminal of the third digitally controlled attenuator is connected to the power amplification module, the power amplification module is connected to the coupler, the duplex filter and the antenna in sequence to form a wireless signal coverage system, and the transmitting terminal of the antenna is used as the output terminal of the system signal.
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| CN 201220371258 CN203039920U (en) | 2012-07-30 | 2012-07-30 | Radio frequency link gain automatic control device |
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| CN 201220371258 CN203039920U (en) | 2012-07-30 | 2012-07-30 | Radio frequency link gain automatic control device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103327600A (en) * | 2012-07-30 | 2013-09-25 | 武汉东为科技有限公司 | Automatic control device and method of radio frequency link gains |
| CN111044085A (en) * | 2018-10-12 | 2020-04-21 | Wago管理有限责任公司 | Safety circuit and method for testing a safety circuit in an automation device |
| CN114204949A (en) * | 2021-11-30 | 2022-03-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic fast digital AGC control method |
-
2012
- 2012-07-30 CN CN 201220371258 patent/CN203039920U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103327600A (en) * | 2012-07-30 | 2013-09-25 | 武汉东为科技有限公司 | Automatic control device and method of radio frequency link gains |
| CN111044085A (en) * | 2018-10-12 | 2020-04-21 | Wago管理有限责任公司 | Safety circuit and method for testing a safety circuit in an automation device |
| CN114204949A (en) * | 2021-11-30 | 2022-03-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic fast digital AGC control method |
| CN114204949B (en) * | 2021-11-30 | 2024-01-30 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic quick digital AGC control method |
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