CN106559866A - A kind of auto gain control method and system - Google Patents
A kind of auto gain control method and system Download PDFInfo
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- CN106559866A CN106559866A CN201510642963.6A CN201510642963A CN106559866A CN 106559866 A CN106559866 A CN 106559866A CN 201510642963 A CN201510642963 A CN 201510642963A CN 106559866 A CN106559866 A CN 106559866A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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Abstract
The present invention relates to communication technical field, and in particular to a kind of AGC system, including：First power statistic module, for counting the first reception average power signal in cycle very first time statistical length；Second power statistic module, for counting the second reception average power signal in the second time cycle statistical length；Gain error computing module is lowered, mathematic interpolation is carried out with first object power to the first reception average power signal, to obtain downward gain error；Gain error computing module is raised, mathematic interpolation is carried out to the second reception average power signal and the second target power, to obtain rise gain error；Gain error selecting module, selects corresponding gain error to adjust the gain of the radio frequency amplifier of receiver.The present invention provides the auto gain control method and system of quick and strong robustness, protects the stability of gain control, can greatly reduce cell search time and ensure the fixed-point performance required for cell search algorithms while good received signal quality is obtained.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an automatic gain control method and an automatic gain control system.
Background
In a communication system, a signal is amplified by a radio frequency amplifier (LNA/PGA) of a receiver to be adjusted to a proper power and then enters an Analog-to-Digital Converter (ADC) to convert the Analog signal into a Digital signal, if the signal is amplified by the radio frequency amplifier to be too large, the signal exceeds the range of the Analog-to-Digital Converter, the signal is saturated and peak-clipped, and the signal quality is damaged; if the signal is amplified too little, the fixed point precision of the digital signal quantized by the analog/digital converter is too low, and the demodulation receiving algorithm is affected.
An Automatic Gain Control (AGC) apparatus automatically adjusts the received signal power to a target power through a feedback loop, so that the signal is not saturated and the fixed point accuracy is also guaranteed, and is one of important circuits of a communication device, particularly a communication receiving device. Fig. 1 shows an automatic gain control apparatus in a conventional receiver, which operates as follows: counting the average power P of the received signal with the length of N in a period of time T, converting the average power P of the received signal into a dB domain and converting the average power P of the received signal into a target power P of the dB domaintargetSubtracting the difference to obtain a gain error G in the dB domain, and smoothing the gain error G to obtain a smoothed gain errorThe smoothed gain errorActing on radio-frequency amplifiers (LN) by means of a feedback loopA/PGA). The automatic gain control method as described above requires a long power statistics period at the initial cell search. Therefore, the time consumed by cell search is long, so that the terminal accesses or switches the cell slowly.
Disclosure of Invention
The present invention aims to provide an automatic gain control method to solve the above technical problems;
it is another object of the present invention to provide an automatic gain control system, which solves the above technical problems;
the technical problem solved by the invention can be realized by adopting the following technical scheme:
an automatic gain control method, comprising the steps of obtaining a down-regulation gain error:
step 1, a first power statistical module counts the average power of a first received signal within a first time period statistical length, a second power statistical module counts the average power of a second received signal within a second time period statistical length, and the first time period statistical length is smaller than the second time period statistical length;
step 2, calculating the difference between the average power of the first received signal and a first target power to obtain a down-regulation gain error;
and 3, judging whether the down-regulation gain error is smaller than 0, if so, selecting the down-regulation gain error to be used for regulating the gain of the radio frequency amplifier, and then executing the step 1 again.
The automatic gain control method of the present invention further comprises a step of obtaining an up gain error, and when the down gain error is greater than or equal to 0 in the step 3, the following steps are performed:
step 4, obtaining the average power of the second received signal, and calculating the difference between the average power of the second received signal and a second target power to obtain an up-regulation gain error;
step 5, smoothing the gain error of the up regulation according to the gain error after smoothing obtained by calculation of the previous period to obtain the gain error of the up regulation after smoothing;
and 6, judging whether the smoothed up-regulation gain error is larger than 0, and if so, selecting the smoothed up-regulation gain error to be used for regulating the gain of the radio frequency amplifier.
In the automatic gain control method of the present invention, in step 1, the first received signal average power is obtained by:
wherein, PshortAverage power for the first received signal; n is a radical ofshortCounting the length point of the first time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal.
In the automatic gain control method of the present invention, in step 1, the second received signal average power is obtained by:
wherein, PlongAverage power for the second received signal; n is a radical oflongThe number of points is the length of the second time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal.
In the step 2, the average power of the first received signal and the target power are converted into a decibel domain and then a difference operation is performed, and the obtained downregulated gain error of the decibel domain is as follows:
wherein G isdownDown-regulation gain error in decibel domain;the average power of the first received signal converted into the decibel domain;to a target power converted into the decibel domain.
In the step 4, the average power of the second received signal and the target power are converted into a decibel domain and then a difference operation is performed, and the obtained up-regulation gain error in the decibel domain is:
wherein G isupUp-regulation gain error in decibel domain;the average power of the second received signal converted into the decibel domain;to a target power converted into the decibel domain.
In step 3, before step 1 is executed again, the power statistics of the average power of the second received signal is reset, and the smoothed up-regulation gain error is cleared.
In the automatic gain control method of the present invention, in the step 5, the smoothed up-regulation gain error is obtained by the following method:
wherein,the smoothed up gain error; gupα up-regulation gain error in decibel domainlongThe smoothing factor is 1/2,1/4 … and 1/32;the smoothed up-regulation gain error calculated for the previous second set time period.
In the automatic gain control method of the present invention, the statistical length of the first time period is 1/4, or 1/2, or 1 OFDM symbol.
In the automatic gain control method of the present invention, the statistical length of the second time period is 2 times, 4 times or 8 times of the first time period, and is not less than 1 OFDM symbol length,
in the automatic gain control method of the present invention, the first target power is higher than the second target power.
The present invention also provides an automatic gain control system, connected to a feedback loop of a receiver, comprising:
the first power statistical module is used for counting the average power of a first receiving signal in a first time period;
the second power statistical module is used for counting the average power of a second receiving signal in a second time period;
the down-regulation gain error calculation module is connected with the first power statistics module and is used for calculating the difference between the average power of the first received signal and a first target power so as to obtain a down-regulation gain error;
the up-regulation gain error calculation module is connected with the second power statistics module and is used for calculating the difference between the average power of the second received signal and a second target power so as to obtain an up-regulation gain error;
and the gain error selection module is respectively connected with the down-regulation gain error calculation module and the up-regulation gain error calculation module and is used for comparing whether the down-regulation gain error is smaller than 0 or comparing whether the up-regulation gain error is larger than 0 so as to select the corresponding gain error, and the gain error is used for adjusting the gain of the radio frequency amplifier of the receiver.
The automatic gain control system of the invention also comprises a decibel domain conversion module,
the down-regulation gain error calculation module is connected between the first power statistics module and the second power statistics module and used for converting the first receiving signal average power and the first target power into a decibel domain;
and/or the presence of a gas in the gas,
and the second power statistics module is connected between the second power statistics module and the up-regulation gain error calculation module and is used for converting the second received signal average power and the second target power into a decibel domain.
The automatic gain control system of the invention also comprises a smoothing processing module which is connected between the gain error selection module and the up-regulation gain error module and is used for smoothing the up-regulation gain error to obtain the smoothed up-regulation gain error.
In the automatic gain control system of the present invention, the statistical length of the first time period is 1/4, or 1/2, or 1 OFDM symbol.
In the automatic gain control system of the invention, the statistical length of the second time period is 2 times, 4 times or 8 times of the first time period, and is not less than 1 OFDM symbol length.
Has the advantages that: by adopting the technical scheme, the invention provides the rapid and strong-robustness automatic gain control method and the system, which can obtain good received signal quality, protect the stability of gain control, greatly reduce the cell search time and ensure the fixed point performance required by the cell search algorithm.
Drawings
FIG. 1 is a schematic diagram of a prior art system architecture;
FIG. 2 is a flow chart illustrating an automatic gain control method according to the present invention;
FIG. 3 is a flow chart of an improved method of the automatic gain control method of the present invention;
FIG. 4 is a flowchart of an embodiment of an automatic gain control method of the present invention;
fig. 5 is a schematic structural diagram of an automatic gain control system according to 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
When initial cell search is performed, the radio frequency amplifier of the receiver needs to be adjusted to a proper gain, so that the power of a signal is close to the target power set by the algorithm, and the cell search algorithm can obtain good performance. In this scenario, the terminal does not have information such as a system frame structure, timing, etc., and is in a receiving state all the time, using the automatic gain control device in the prior art, it is possible to count the received signal power of the uplink subframe, if the uplink subframe has adjacent terminal interference, the downlink subframe data (including the primary synchronization sequence PSS and the secondary synchronization sequence SSS) used for cell search may be adjusted to be very small, which results in loss of the fixed point precision and the performance of the algorithm, and if the uplink subframe has no signal, the automatic gain control device may adjust the gain to be very large, which results in saturation of the downlink subframe.
The following table is an uplink and downlink subframe allocation table of TDD-LTE and TD-SCDMA:
as shown in the above table, according to different uplink and downlink ratios, the configuration is divided into 7 different configurations, where "D" represents the subframe for downlink transmission, "U" represents the subframe for uplink transmission, "S" is a special subframe composed of DwPTS (downlink Pilot Time slot), GP (guard period) is used for uplink and downlink conversion protection, and UpPTS (uplink Pilot Time slot) is used for uplink and downlink transmission.
An uplink subframe in a time division communication system (TDD-LTE) is a time window in which a terminal transmits a signal to a base station, and in the uplink subframe, the terminal does not receive a downlink signal from the base station and may receive an uplink transmission signal of an adjacent terminal. There is no signal expected to be received in the uplink subframe, which makes the conventional automatic gain control apparatus unable to ensure the stability of gain control while obtaining good received signal quality.
The invention provides an automatic gain control method, which refers to fig. 2, and comprises the following steps of:
step 1, a first power statistical module counts the average power of a first received signal within a first time period statistical length, a second power statistical module counts the average power of a second received signal within a second time period statistical length, and the first time period statistical length is smaller than the second time period statistical length;
step 2, after judging that the average power of the first received signal is counted completely, calculating the difference between the average power of the first received signal and a first target power to obtain a down-regulation gain error;
and 3, when the down-regulation gain error is judged to be smaller than 0, selecting the down-regulation gain error to be used for regulating the gain of the radio frequency amplifier, and then executing the step 1 again.
The automatic gain control method of the present invention further comprises a step of obtaining a gain error of the up-regulation rf amplifier, and when the down-regulation gain error is greater than or equal to 0 in step 3, the following steps are performed, referring to fig. 3:
step 4, after the second received signal average power is judged to be counted, obtaining a second received signal average power, and calculating a difference value between the second received signal average power and a second target power to obtain an up-regulation gain error;
step 5, smoothing the gain error of the up regulation according to the gain error after smoothing obtained by calculation of the previous period to obtain the gain error of the up regulation after smoothing;
and 6, judging whether the smoothed up-regulation gain error is larger than 0, and if so, selecting the smoothed up-regulation gain error to be used for regulating the gain of the radio frequency amplifier.
In step 1, the average power of the first received signal is obtained by:
wherein, PshortAverage power for the first received signal; n is a radical ofshortCounting the length for a first time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal.
The second received signal average power is obtained by:
wherein, PlongAverage power for the second received signal; n is a radical oflongCounting the length for the second time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal. The statistical length of the first time period is smaller than that of the second time period, namely the statistical period of the average power of the first received signal is shorter than that of the average power of the second received signal, the period is short, the gain can be controlled to be adjusted downwards to prevent the signals from being saturated for a long time, the period is long, the gain can be controlled to be adjusted upwards to enable the signal power to be close to the target power, better signal quality is obtained, and the two are combined to enable the received signals to be close to the target power as much as possible on the premise of being unsaturated, so that a cell search algorithm obtains good performance.
In step 2, the average power and the target power of the first received signal are converted into a decibel domain and then subjected to difference value operation, and the obtained downregulated gain error of the decibel domain is as follows:
wherein G isdownDown-regulation gain error in decibel domain;the average power of the first received signal converted into the decibel domain;to a target power converted into the decibel domain.
In step 4, the average power and the target power of the second received signal are converted into a decibel domain and then subjected to difference operation, and the obtained up-regulation gain error of the decibel domain is as follows:
wherein G isupUp-regulation gain error in decibel domain;the average power of the second received signal converted into the decibel domain;to a target power converted into the decibel domain.
In step 3, the power statistics of the average power of the second received signal is reset before step 1 is executed again, and the smoothed up-regulation gain error is cleared.
In step 5, the smoothed up gain error is obtained by the following method:
wherein,the smoothed up gain error; gupα up-regulation gain error in decibel domainlongThe smoothing factor is 1/2,1/4 … and 1/32;the smoothed up-regulation gain error calculated for the previous second time period.
According to the automatic gain control method, the statistical length of the first time period is 1/4, 1/2 or 1 orthogonal frequency division multiplexing OFDM symbols, and gain errors are not smoothed; the statistical length of the second time period may be selected to be 2, 4 or 8 times the statistical length of the first time period, but the statistical length is at least 1 OFDM symbol length, and the smoothing factorThe gain may be set to 1/2,1/4, 1/8, 1/16, or the like. The length of 1 OFDM symbol is 66.67us, and the configuration ensures that the statistical length of the first time period of gain down regulation is short enough, thereby ensuring that the signal is quickly down regulated to prevent the signal from being saturated for too long time when the signal power is too high, and simultaneously ensuring that the statistical length of the second time period of gain up regulation is long enough, the power statistical accuracy is high, and the signal power can be as close to the target power as possible; the first target power is higher than the second target powerThe two have the following relationship:to prevent the gain control from ringing.
One specific embodiment, referring to fig. 4, includes the following steps:
step s1, determining whether the average power of the first received signal is counted, if not, continuing to execute step s1, if yes, executing step s 2;
step s2, calculating a difference between the first received signal average power and a first target power to calculate a down-regulation gain error;
step s3, judging whether the down gain error is greater than or equal to 0, if not, selecting the down gain error to adjust the gain of the radio frequency amplifier, and resetting the average power of the first receiving signal and the average power of the second receiving signal, if so, executing step s 4;
step s4, determining whether the average power of the second received signal is counted, if not, executing step s 1;
step s5, calculating a difference between the average power of the second received signal and a second target power to obtain an up-regulation gain error, and smoothing to obtain a smoothed up-regulation gain error;
and step s6, determining whether the smoothed up-regulation gain error is less than or equal to 0, if not, selecting the up-regulation gain error to be used for regulating the gain of the radio frequency amplifier, resetting the average power of the first received signal and the average power of the second received signal, and if so, re-executing step s 1.
The present invention also provides an automatic gain control system connected in a feedback loop of a receiver, referring to fig. 5, comprising:
a first power statistic module 11, configured to count an average power of a first received signal in a first time period;
a second power statistic module 21, configured to count average power of a second received signal in a second time period;
a down gain error calculation module 12, connected to the first power statistics module 11, for calculating a difference between the first received signal average power and a first target power to obtain a down gain error;
the up-regulation gain error calculation module 22 is connected to the second power statistics module 21, and calculates a difference between the average power of the second received signal and a second target power to obtain an up-regulation gain error.
The gain error selection module 31 is connected to the down gain error calculation module 12 and the up gain error calculation module 22, respectively, and is configured to compare whether the down gain error is smaller than 0 or whether the up gain error is larger than 0, so as to select a corresponding gain error, where the gain error is used to adjust a gain of a radio frequency amplifier of the receiver.
The automatic gain control system of the invention also comprises a decibel domain conversion module,
the first power statistics module 11 is connected to the down-regulation gain error calculation module 12, and is configured to convert the first received signal average power and the first target power into a decibel domain;
and/or the presence of a gas in the gas,
and the second power statistics module 21 is connected between the up-regulation gain error calculation module and the first power statistics module, and is configured to convert the average power of the first received signal and the first target power into a decibel domain.
The automatic gain control system of the present invention further comprises a smoothing module, connected between the gain error selection module 31 and the up-regulation gain error module, for smoothing the up-regulation gain error to obtain a smoothed up-regulation gain error.
The first time period of the automatic gain control system is 1/4, 1/2 or 1 OFDM symbols in statistical length.
In the automatic gain control system, the second time period statistic length is 2 times or 4 times or 8 times of the first time period statistic length and is not less than 1 OFDM symbol length.
The invention uses the fast gain control loop formed by the first power statistic module 11, the down-regulation gain error calculation module 12 and the gain error selection module 31 and the slow gain control loop formed by the second power statistic module 21, the up-regulation gain error calculation module 22 and the gain error selection module 31, the fast gain control period is short, the gain is controlled to be down-regulated to protect the signal from being saturated, the slow gain control period is long, and the gain is controlled to be up-regulated to obtain better signal quality. The combination of the two can make the received signal approach to the target power as much as possible under the precondition of no saturation, so that the cell search algorithm obtains good performance.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (16)
1. An automatic gain control method, comprising the steps of obtaining a down-regulation gain error:
step 1, a first power statistical module counts the average power of a first received signal within a first time period statistical length, a second power statistical module counts the average power of a second received signal within a second time period statistical length, and the first time period statistical length is smaller than the second time period statistical length;
step 2, calculating the difference between the average power of the first received signal and a first target power to obtain a down-regulation gain error;
and 3, judging whether the down-regulation gain error is smaller than 0, if so, selecting the down-regulation gain error to be used for regulating the gain of the radio frequency amplifier, and then executing the step 1 again.
2. The automatic gain control method according to claim 1, further comprising a step of obtaining an up gain error, and when the down gain error is greater than or equal to 0 in the step 3, performing the following steps:
step 4, obtaining the average power of the second received signal, and calculating the difference between the average power of the second received signal and a second target power to obtain an up-regulation gain error;
step 5, smoothing the gain error of the up regulation according to the gain error after smoothing obtained by calculation of the previous period to obtain the gain error of the up regulation after smoothing;
and 6, judging whether the smoothed up-regulation gain error is larger than 0, and if so, selecting the smoothed up-regulation gain error to be used for regulating the gain of the radio frequency amplifier.
3. The automatic gain control method according to claim 1, wherein in step 1, the first received signal average power is obtained by:
wherein, PshortAverage power for the first received signal; n is a radical ofshortCounting the length for a first time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal.
4. The automatic gain control method according to claim 1, wherein in step 1, the second received signal average power is obtained by:
wherein, PlongAverage power for the second received signal; n is a radical oflongCounting the length for the second time period; i (n) is the real part of the received signal; q (n) is the imaginary part of the received signal.
5. The automatic gain control method according to claim 1, wherein in the step 2, the difference operation is performed after the average power of the first received signal and the target power are converted into a decibel domain, and the down-regulation gain error in the decibel domain is obtained as follows:
wherein G isdownDown-regulation gain error in decibel domain;the average power of the first received signal converted into the decibel domain;to a target power converted into the decibel domain.
6. The automatic gain control method according to claim 2, wherein in the step 4, the difference operation is performed after the average power of the second received signal and the target power are converted into a decibel domain, and the obtained up-regulation gain error in the decibel domain is:
wherein G isupUp-regulation gain error in decibel domain;the average power of the second received signal converted into the decibel domain;to a target power converted into the decibel domain.
7. The automatic gain control method according to claim 2, wherein in step 3, before re-executing step 1, the power statistics of the average power of the second received signal is reset, and the smoothed up-regulation gain error is cleared.
8. The automatic gain control method according to claim 6, wherein in the step 5, the smoothed up-regulation gain error is obtained by:
wherein,the smoothed up gain error; gupIs decibelGain error of up-regulation of domain αlongThe smoothing factor is 1/2,1/4 … and 1/32;the smoothed up-regulation gain error calculated for the previous second set time period.
9. The automatic gain control method of claim 1, wherein the first time period is 1/4, 1/2, or 1 OFDM symbols in statistical length.
10. The automatic gain control method of claim 1, wherein the second time period statistic length is 2 times, or 4 times, or 8 times the first time period statistic length, and is not less than 1 OFDM symbol length.
11. The automatic gain control method of claim 2, wherein the first target power is higher than the second target power.
12. An automatic gain control system, coupled in a feedback loop of a receiver, comprising:
the first power statistical module is used for counting the average power of a first receiving signal within a first time period statistical length;
the second power statistical module is used for counting the average power of a second receiving signal within a second time period statistical length;
the down-regulation gain error calculation module is connected with the first power statistics module and is used for calculating the difference between the average power of the first received signal and a first target power so as to obtain a down-regulation gain error;
and the up-regulation gain error calculation module is connected with the second power statistics module and is used for calculating the difference between the average power of the second received signal and a second target power so as to obtain an up-regulation gain error.
And the gain error selection module is respectively connected with the down-regulation gain error calculation module and the up-regulation gain error calculation module and is used for comparing whether the down-regulation gain error is smaller than 0 or comparing whether the up-regulation gain error is larger than 0 so as to select the corresponding gain error, and the gain error is used for adjusting the gain of the radio frequency amplifier of the receiver.
13. The automatic gain control system of claim 12, further comprising a decibel domain conversion module,
the down-regulation gain error calculation module is connected between the first power statistics module and the second power statistics module and used for converting the first receiving signal average power and the first target power into a decibel domain;
and/or the presence of a gas in the gas,
and the second power statistics module is connected between the second power statistics module and the up-regulation gain error calculation module and is used for converting the second received signal average power and the second target power into a decibel domain.
14. The automatic gain control system of claim 12 further comprising a smoothing module coupled between the gain error selection module and the up-regulation gain error module for smoothing the up-regulation gain error to obtain a smoothed up-regulation gain error.
15. The automatic gain control system of claim 12 wherein the first time period is 1/4, 1/2, or 1 OFDM symbol in statistical length.
16. The automatic gain control system of claim 15, wherein the second time period statistic length is 2 times, or 4 times, or 8 times the first time period statistic length, and is not less than 1 OFDM symbol length.
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| CN107948110A (en) * | 2017-11-27 | 2018-04-20 | 南京雷行信息技术有限公司 | It is a kind of based on synchronous AGC Method in LTE system |
| CN112866162A (en) * | 2021-01-05 | 2021-05-28 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Automatic gain control method, system and medium based on time domain and frequency domain power |
| WO2022062993A1 (en) * | 2020-09-22 | 2022-03-31 | 紫光展锐(重庆)科技有限公司 | Gain parameter adjusting method and apparatus, and device |
| CN116634543A (en) * | 2023-06-16 | 2023-08-22 | 网络通信与安全紫金山实验室 | A gain control method, device, communication node and medium |
| CN119729730A (en) * | 2024-12-16 | 2025-03-28 | 爱科微半导体(上海)有限公司 | Method for tracking transmitting power and receiving power in wifi system |
| CN120751473A (en) * | 2025-08-07 | 2025-10-03 | 成都高新区通信测量技术研究院 | Digital automatic gain control method, storage medium and device suitable for private network |
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| CN116634543A (en) * | 2023-06-16 | 2023-08-22 | 网络通信与安全紫金山实验室 | A gain control method, device, communication node and medium |
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