CN102480273B - Device and method for realizing output power control of power amplifier - Google Patents
Device and method for realizing output power control of power amplifier Download PDFInfo
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- CN102480273B CN102480273B CN201010560071.9A CN201010560071A CN102480273B CN 102480273 B CN102480273 B CN 102480273B CN 201010560071 A CN201010560071 A CN 201010560071A CN 102480273 B CN102480273 B CN 102480273B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
Abstract
The invention discloses a device and method for realizing output power control of a power amplifier. The device is characterized in that: a peak value detector 1 and a peak value detector 2 respectively detect an output signal power and an input signal power of the power amplifier; the corresponding output and input power detection voltages are output to an AD (Analogue-to-Digital) converter together; the AD converter converts the output and input power detection voltages into the corresponding output and input power values and transmits the corresponding output and input power values to a power control module; and the power control module obtains an input signal power threshold value under the corresponding power grade according to expected powers under various power grades of a power amplifier and the output and input power values, and controls an output power of the power amplifier in the known power amplifier state. The device and the method provided by the invention effectively prevent a transmitter from being in a saturated status or an over-power status, so as to avoid abnormalities, such as transmission index deterioration of a base station, occurrences of over-cover or over-area cover, and the like.
Description
Technical field
The present invention relates to the control method of power amplifier apparatus and power output thereof, relate in particular to the device and method of realizing power amplifier output power control in base station transmitter.
Background technology
In field of wireless communication, global system for mobile communications (GSM, Global System of Mobilecommunication) base station transmitter generally all adopts close-loop power controlling method, its theory diagram as shown in Figure 1, crest voltage testing circuit by power amplifier (abbreviation power amplifier) output obtains output power in base station, the output power value obtaining and expectation power are compared, result is relatively used for upgrading the calibration value of power control, carry out the numerical-control attenuator of power ratio control amplifier front end with calibration value, reach the object of regulating and controlling power output, make it be stabilized in the level of expecting power.
By the principle of close-loop power control, wherein need base station to obtain in advance the expectation power under different capacity grade, need to obtain by peak detection circuit the power output of power amplifier, to reach the control to numerical-control attenuator, reach the object of the power of the input signal that regulates power amplifier.Conventionally the base station power grade of GSM is 22 grades altogether, and wherein rate of static power is 6 grades, 15 grades of dynamic power grades, and 0 power grade is maximum power level, therefore combination obtains 22 power grades altogether.Expect that power constant power control parameter is all to obtain by test before base station equipment complete machine dispatches from the factory, and be kept in electricallyerasable ROM (EEROM) (EEPROM), other parameter is kept in the flash memory (Flash) being connected with CPU.The power output of power amplifier (PA) detects power output detecting circuit by peak detection circuit, convert thereof into digital power value of feedback through modulus (AD) transducer, pass through digital signal processor module (dsp chip) through Field Programmable Gate Array (FPGA), complete close-loop power control by this DSP module by software, control numerical-control attenuator (DA) attenuation through FPGA, thereby realize the stable output of base station power.
The yield value of power amplifier theory may with actual yield value difference to some extent, this is because dispatch from the factory batch difference or various other factors cause actual yield value discrete; Secondly, on different frequencies, because the difference of impedance causes electric current difference, it is all also different making thus yield value.Therefore for different power amplifiers, it expects that power is different.When power amplifier power output value of feedback is lower than expecting when power, can ceaselessly adjust calibration value, increase the input signal of power amplifier by reducing numerical-control attenuator attenuation, power amplifier power output is constantly improved, finally make power amplifier be operated in saturation condition (being operated in inelastic region).The consequence causing is like this that the index that transmits of base station worsens, and was operated under covering state, thereby interference is caused in other community, worsens further network index.Secondly, because power amplifier long-term work is in saturation region, cause excess Temperature, may burn out power amplifier, the consequence causing thus can be more serious.
Through the analysis to real case, find to cause power output value of feedback varied lower than the reason of expecting power.For example, the excess Temperature of operational environment causes the device failure of power amplifier output port, or the damage of power amplifier power output feedback path, or some device rosin joint of power amplifier etc.These above factors all likely can occur, and be difficult to avoid after a period of time is worked in base station.
In existing technology, also having many is to complete by power amplifier hardware circuit for detection of the saturated device of power amplifier substantially, and peak detector detects the size of power output, for judging whether to have reached saturation condition.But this situation of the electric voltage exception (value of feedback is for a long time lower than expecting power) feeding back for power amplifier power output, but cannot effectively detect, thereby cannot avoid power amplifier to be operated in saturation condition.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of device and method of realizing power amplifier output power control, can effectively prevent that power amplifier from working under saturation condition.
In order to solve the problems of the technologies described above, the invention provides a kind of device of realizing power amplifier output power control, comprise the first peak detector, analog to digital converter and the power control module of power amplifier output, it is characterized in that, also comprise the second peak detector of power amplifier input, wherein:
The first peak detector, for exporting to analog to digital converter by corresponding detection power amplifier output signal power power output detecting circuit;
The second peak detector, for exporting to analog to digital converter by corresponding detection power amplifier input signal power input power detecting circuit;
Analog to digital converter, for respectively power output detecting circuit and input power detecting circuit being converted to corresponding output power value and input power value, and exports to power control module;
Power control module, for obtaining input signal power threshold value under corresponding power grade according to the output power value of the expectation power under the each power grade of power amplifier and input, input power value, according to the state power ratio control amplifier output power of the power amplifier of knowing.
Further, this device also comprises numerical-control attenuator, wherein:
Analog to digital converter is according to the output power value of input, the gain that input power value is obtained power amplifier reality, obtain input signal power threshold value under corresponding power grade according to the expectation power under the each power grade of power amplifier and actual gain, according to the state with the power amplifier of answering the comparative result of input signal power threshold value under power grade to know by input power value, output control signal is to numerical-control attenuator;
Numerical-control attenuator, for passing through the control signal control numerical control attenuation of input, to carry out the output signal power of power ratio control amplifier by the input signal power of power ratio control amplifier.
Further, power control module comprises the Field Programmable Gate Array, digital processor module and the CPU that connect successively, wherein:
Field Programmable Gate Array, for converting the output power value of input, input power value to the logarithm value of corresponding power output and the logarithm value of input power, exports to digital processor module; Convert the power control value of input to control signal and export to numerical-control attenuator;
Digital processor module, for according to the gain of the difference rated output amplifier reality of the logarithm value of the logarithm value of power output and input power; The expectation power trace under each power grade according to the gain of this reality and the power amplifier that reads, calculates the input power threshold value of obtaining under corresponding power grade; Judge the residing state of power amplifier according to the logarithm value of input power with the comparative result of the input power threshold value under corresponding power grade, and corresponding power control value is exported to Field Programmable Gate Array;
CPU, calculates the input power threshold value under the corresponding power grade obtaining for preserving digital processor module; In the time powering on, the input power threshold value under the corresponding power grade reading is exported to digital processor module.
Further,
If the logarithm value of digital processor module comparison input power is less than the input power threshold value under corresponding power grade, judge power amplifier place normal condition, the power control value of normal close-loop power control is carried out in output; Otherwise, judging the critical saturation condition in power amplifier place or critical over-power condition, export-restriction continues to reduce the power control value of the numerical control attenuation under this power grade.
Further,
If the logarithm value of digital processor module comparison input power is not less than the input power threshold value under corresponding power grade, and continue to judge that current time slots is zero energy grade, report power amplifier place critical saturation condition, judge that current time slots is not zero energy grade if continue, report that power amplifier is issued to critical over-power condition at this power grade.
In order to solve the problems of the technologies described above, the invention provides a kind of method that realizes power amplifier output power control, comprising:
Work in default power after power amplifier powers on time, detect respectively this power amplifier input signal power and output signal power, calculate thus the yield value of this power amplifier reality;
According to the yield value of this power amplifier reality and the expectation power under each power grade, calculate the input power threshold value under the corresponding power grade of this power amplifier;
By input signal power threshold value comparison under the input signal power detecting and corresponding power grade, according to the power output of this power amplifier of state control of this power amplifier of judging by comparative result.
Further,
Calculate the yield value of this power amplifier reality, the logarithm value that equals output signal power deducts the logarithm value of input signal power.
Further,
Calculate the input power threshold value under the corresponding power grade of this power amplifier, equal this power grade and expect that performance number deducts after the yield value of this power amplifier reality, add power engineering margin value.
Further, by input signal power threshold value comparison under the logarithm value of the input signal power detecting and corresponding power grade, according to the power output of this power amplifier of state control of this power amplifier of judging by comparative result, specifically comprise:
If relatively the logarithm value of input power is less than input signal power threshold value under corresponding power grade, judge that this power amplifier works in normal condition, carry out the normal calibration of power according to the output signal power detecting;
If relatively the logarithm value of input power is not less than input signal power threshold value under corresponding power grade, judge that this power amplifier, in critical saturation condition or critical over-power condition, stops this power grade to carry out the calibration operation of power rise.
Further,
Be not less than under corresponding power grade input signal power threshold value in the logarithm value of input power relatively, continue to judge that current time slots is zero energy grade, report this critical saturation condition in power amplifier place, judge that current time slots is not zero energy grade if continue, report that power amplifier locates critical over-power condition under this power grade; Continue to reduce the numerical control attenuation under this power grade by stopping, stopping this power grade to carry out the calibration operation of power rise.
The present invention is by increasing the real-time detection to input signal power at power amplifier input, utilize the input signal power of power amplifier that detects and output signal power to calculate the actual gain of power amplifier, obtain the threshold value of power amplifier input signal power under different capacity grade with this; By the comparison of input signal power and corresponding threshold value, operate accordingly according to comparative result, effectively prevent that thus power amplifier is operated in saturation condition and damages transmitter, avoid base station area covered and affect communication network quality.
Brief description of the drawings
Fig. 1 is the block diagram of power amplifier output power control device in existing GSM base station transmitter;
The block diagram of Fig. 2 power amplifier output power control device of the present invention embodiment;
Fig. 3 is the flow chart of the control method embodiment of power amplifier output power of the present invention;
Fig. 4 is according to the flow chart of power amplifier state control power output in the flow process shown in Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, technical scheme of the present invention is illustrated in more detail.Although be taking GSM base station system as embodiment below, should be clear and definite, this is for description and interpretation the present invention, and does not form the restriction to technical solution of the present invention.
As shown in Figure 2, be the structure of power amplifier output power control device one embodiment of the present invention, comprise the peak detector 1 of power amplifier input and peak detector 2, AD converter, power control module and the numerical-control attenuator of output, wherein:
Peak detector 1, for detection of the output signal power of power amplifier, exports to AD converter by power output detecting circuit;
Peak detector 2, for detection of the input signal power of power amplifier, exports to AD converter by input power detecting circuit;
AD converter, for respectively power output detecting circuit and input power detecting circuit analog signal separately being converted to corresponding output power value and input power value, and exports to power control module;
Power control module, for obtaining input signal power threshold value under the each power grade of power amplifier according to the output power value of the expectation power of power amplifier and input, input power value, know the state of power amplifier according to the comparative result of input signal power threshold value under input power value and corresponding power grade, export accordingly control signal to numerical-control attenuator;
Numerical-control attenuator, for passing through the control signal control numerical control attenuation of input, thereby controls the input signal power of power amplifier.
Power control module shown in Fig. 2 further comprises the Field Programmable Gate Array (FPGA), DSP module and the CPU that connect successively, also comprises the EEPROM and the Flash memory that is connected CPU that connect DSP module, wherein:
FPGA, for converting the output power value of input, input power value to the logarithm value of corresponding power output and the logarithm value of input power, exports to DSP module as Feedback of Power value;
DSP module, for calculating the yield value of power amplifier reality, equals the logarithm value of the logarithm value-input power of power output; The expectation power trace under each power grade according to the yield value of power amplifier reality and the power amplifier that reads from EEPROM, calculates the input power threshold value of obtaining under the corresponding power grade of power amplifier, and exports to CPU; Wherein:
The logarithm value of the logarithm value-input power of the yield value=power output of power amplifier reality;
Input power threshold value under corresponding power grade=
This power grade is expected yield value+power engineering margin value of performance number-power amplifier reality;
CPU, is kept at Flash memory for the input power threshold value under the corresponding power grade that DSP module is calculated; In the time powering on, the input power threshold value the corresponding power grade reading from Flash memory is exported to DSP module.
DSP module, according to the comparative result of the input power threshold value under the corresponding power grade that the input power logarithm value detecting is in real time exported with CPU, judges the state of power amplifier, and output power value is to FPGA accordingly;
FPGA converts the power control value of input to control signal and exports to numerical-control attenuator.
If the input power logarithm value that DSP module detects relatively is in real time less than the input power threshold value under corresponding power grade, judge power amplifier place normal condition, utilize the logarithm value of power output to carry out normal close-loop power control process; If the input power logarithm value detecting relatively is in real time equal to or greater than the input power threshold value under corresponding power grade, stop this power grade to carry out the calibration operation of power rise, i.e. restriction continues to reduce the numerical control attenuation under this power grade, no longer continues to increase to control the input power value of power amplifier.
Judge that current time slots (is in 8 time slots in a tdma frame in gsm system if continue, time is 577 microseconds, the power grade of each time slot work is possible different) be 0 power grade, report power amplifier place critical saturation condition, the attenuation that reduces numerical-control attenuator by further restriction limits the input power value of power amplifier, prevent that power amplifier work is to saturation condition, thereby avoid the launching target of base station to worsen; Judge that current time slots is not 0 power grade if continue, report that power amplifier is issued to critical over-power condition at this power grade, the input power value of same further restriction power amplifier, prevent that power amplifier is operated in over-power condition, thereby effectively prevented that the anomalies such as covering or area covered from appearring in base station.
For the ease of monitoring communication network base station equipment ruuning situation, whether engineering construction can increase power amplifier that alarm carrys out reporting base station transmitter in critical saturation condition and critical over-power condition according to actual conditions.
By the structure comparison shown in the structure of the embodiment shown in Fig. 2 and Fig. 1, can find out that its difference is, increase a peak detector at the input of power amplifier, be used for the size of the input signal power of real-time detection power amplifier, carry out the input signal power of limiting power amplifier with this, thereby prevent that power amplifier is operated in saturation condition, also prevent that the transmitting power of base station from exceeding the expectation power under predetermined power grade simultaneously.
The present invention is directed to said apparatus embodiment, it is after base station transmitter powers on, to be operated under default transmitting power to carry out that the embodiment of the method that realizes power amplifier output power control, its flow process are correspondingly also provided, and as shown in Figure 3, comprises the steps:
310: detect respectively power amplifier input signal power and output signal power, calculate accordingly and preserve the yield value of power amplifier reality;
The logarithm value of the logarithm value-input power of the yield value=power output of power amplifier reality;
320: according to the expectation power under the yield value of power amplifier reality and the each power grade of power amplifier, calculate and preserve the input power threshold value under the corresponding power grade of power amplifier;
Input power threshold value under corresponding power grade=
This power grade is expected yield value+power engineering margin value of performance number-power amplifier reality;
330: by input signal power threshold value comparison under the power amplifier input signal power detecting and corresponding power grade, judge the state of power amplifier according to comparative result, and control accordingly the power output of power amplifier.
Be actually the state according to power amplifier, by regulating the input power of power amplifier to control the power output of power amplifier.Fig. 4 has represented in the flow process shown in Fig. 2, according to the flow process of power amplifier state control power output, to comprise the steps:
3301: the input power threshold value under the corresponding power grade of power amplifier of reading and saving;
3302: according to the power grade of power amplifier, relatively input signal power value and the input power threshold value of time slot feedback;
3303: judge whether input signal power value is less than input power threshold value, is to perform step 3304, otherwise execution step 3305;
3304: carry out the normal calibration of power, process ends according to the power amplifier output power value of feedback;
3305: the calibration operation that stops this power grade to carry out power rise;
I.e. restriction continues to reduce the numerical control attenuation under this power grade, continues to increase to limit the input power value of power amplifier.
3306: judge whether current time slots is 0 power grade, is to perform step 3307, otherwise execution step 3308;
3307: report power amplifier is operated in critical saturation condition, the input signal power of restriction power amplifier increases, process ends;
Continue to reduce the numerical control attenuation under this power grade by stopping, the input signal power that limits power amplifier increases.
3308: report power amplifier is operated in critical over-power condition, the input signal power of restriction power amplifier increases, process ends.
Above flow process represents, is less than input power threshold value knows that power amplifier is operated in normal condition according to input signal power value, carries out normal calibration of power operation according to the power amplifier output power value of feedback; The power grade that is equal to or greater than input power threshold value and current time slots according to input signal power value knows that power amplifier is operated in critical saturation condition or critical over-power condition, stop corresponding power grade to carry out the calibration operation of power rise, continue to reduce the numerical control attenuation under this power grade by restriction, the input power value that limits power amplifier continues to increase, effectively contain that power amplifier is operated in saturated or over-power condition because input signal is excessive, thereby avoided the launching target deterioration of base station and occurred the anomalies such as covering or area covered.
Claims (10)
1. realize the device of power amplifier output power control for one kind, comprise the first peak detector, analog to digital converter and the power control module of power amplifier output, it is characterized in that, also comprise the second peak detector of power amplifier input, wherein:
The first peak detector, for exporting to described analog to digital converter by corresponding detection power amplifier output signal power power output detecting circuit;
The second peak detector, for exporting to described analog to digital converter by corresponding detection power amplifier input signal power input power detecting circuit;
Described analog to digital converter, for respectively described power output detecting circuit and described input power detecting circuit being converted to corresponding output power value and input power value, and exports to described power control module;
Described power control module, for obtaining input signal power threshold value under corresponding power grade according to the output power value of the expectation power under the each power grade of power amplifier and input, input power value, according to the state power ratio control amplifier output power of the power amplifier of knowing;
Wherein, the state power ratio control amplifier output power of the power amplifier that described basis is known comprises: when the state of power amplifier is in normal condition, carry out the normal calibration of power, when power amplifier is during in critical saturation condition or critical over-power condition, export-restriction continues to reduce the power control value of the numerical control attenuation under this power grade.
2. according to device claimed in claim 1, it is characterized in that, also comprise numerical-control attenuator, wherein:
Described analog to digital converter is according to the output power value of input, the gain that input power value is obtained power amplifier reality, obtain input signal power threshold value under corresponding power grade according to the expectation power under the each power grade of power amplifier and actual gain, according to the state of the described power amplifier of knowing with the comparative result of input signal power threshold value under corresponding power grade by input power value, output control signal is given described numerical-control attenuator;
Described numerical-control attenuator, for passing through the control signal control numerical control attenuation of input, to carry out the output signal power of power ratio control amplifier by the input signal power of power ratio control amplifier.
3. according to device claimed in claim 2, it is characterized in that, described power control module comprises the Field Programmable Gate Array, digital processor module and the CPU that connect successively, wherein:
Field Programmable Gate Array, for converting the output power value of input, input power value to the logarithm value of corresponding power output and the logarithm value of input power, exports to described digital processor module; Convert the power control value of input to control signal and export to described numerical-control attenuator;
Described digital processor module, for according to the gain of the difference rated output amplifier reality of the logarithm value of the logarithm value of power output and input power; The expectation power trace under each power grade according to the gain of this reality and the power amplifier that reads, calculates the input power threshold value of obtaining under corresponding power grade; Judge the residing state of power amplifier according to the logarithm value of described input power with the comparative result of the input power threshold value under described corresponding power grade, and corresponding power control value is exported to described Field Programmable Gate Array;
Described CPU, calculates the input power threshold value under the corresponding power grade obtaining for preserving described digital processor module; In the time powering on, the input power threshold value under the corresponding power grade reading is exported to described digital processor module.
4. according to device claimed in claim 3, it is characterized in that,
If the logarithm value of the more described input power of described digital processor module is less than the input power threshold value under corresponding power grade, judge power amplifier place normal condition, the power control value of normal close-loop power control is carried out in output; Otherwise, judging the critical saturation condition in power amplifier place or critical over-power condition, export-restriction continues to reduce the power control value of the numerical control attenuation under this power grade.
5. according to device claimed in claim 4, it is characterized in that,
If the logarithm value of the more described input power of described digital processor module is not less than the input power threshold value under corresponding power grade, and continue to judge that current time slots is zero energy grade, report that power amplifier place states critical saturation condition, judge that current time slots is not zero energy grade if continue, report that power amplifier is issued to critical over-power condition at this power grade.
6. a method that realizes power amplifier output power control, comprising:
Work in default power after power amplifier powers on time, detect respectively this power amplifier input signal power and output signal power, calculate thus the yield value of this power amplifier reality;
According to the yield value of this power amplifier reality and the expectation power under each power grade, calculate the input power threshold value under the corresponding power grade of this power amplifier;
By input signal power threshold value comparison under the input signal power detecting and corresponding power grade, according to the power output of this power amplifier of state control of this power amplifier of judging by comparative result;
Wherein, the power output of this power amplifier of state control of this power amplifier that described basis is judged by comparative result comprises: when the state of power amplifier is in normal condition, carry out the normal calibration of power, when power amplifier is during in critical saturation condition or critical over-power condition, export-restriction continues to reduce the power control value of the numerical control attenuation under this power grade.
7. in accordance with the method for claim 6, it is characterized in that,
Calculate the yield value of this power amplifier reality, the logarithm value that equals output signal power deducts the logarithm value of input signal power.
8. in accordance with the method for claim 7, it is characterized in that,
Calculate the input power threshold value under the corresponding power grade of this power amplifier, equal this power grade and expect that performance number deducts after the yield value of this power amplifier reality, add power engineering margin value.
9. in accordance with the method for claim 8, it is characterized in that, by input signal power threshold value comparison under the logarithm value of the input signal power detecting and corresponding power grade, according to the power output of this power amplifier of state control of this power amplifier of judging by comparative result, specifically comprise:
If the logarithm value of more described input power is less than input signal power threshold value under described corresponding power grade, judge that this power amplifier works in normal condition, carry out the normal calibration of power according to the described output signal power detecting;
If the logarithm value of more described input power is not less than input signal power threshold value under described corresponding power grade, judge that this power amplifier, in critical saturation condition or critical over-power condition, stops this power grade to carry out the calibration operation of power rise.
10. in accordance with the method for claim 9, it is characterized in that,
Be not less than under described corresponding power grade input signal power threshold value in the logarithm value of more described input power, continue to judge that current time slots is zero energy grade, report that this power amplifier place states critical saturation condition, judge that current time slots is not zero energy grade if continue, report that power amplifier locates critical over-power condition under this power grade; Continue to reduce the numerical control attenuation under this power grade by stopping, stopping this power grade to carry out the calibration operation of power rise.
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| CN201010560071.9A CN102480273B (en) | 2010-11-24 | 2010-11-24 | Device and method for realizing output power control of power amplifier |
| PCT/CN2011/074091 WO2012068836A1 (en) | 2010-11-24 | 2011-05-16 | Device and method for implementing output power control of power amplifier |
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| CN103458430B (en) * | 2012-05-31 | 2016-08-10 | 京信通信系统（中国）有限公司 | The power detecting method of GSM time slot signal and power-sensing circuit |
| CN104052421B (en) * | 2013-03-15 | 2018-08-07 | 南京中兴软件有限责任公司 | A kind of method, apparatus and communication apparatus of control power amplifier voltage |
| CN105007117B (en) * | 2015-05-22 | 2018-11-02 | 深圳市磊科实业有限公司 | A kind of method of automatic calibration BOB transmission powers |
| CN107733379B (en) * | 2016-08-11 | 2021-08-03 | 格兰康希通信科技(上海)有限公司 | Radio frequency amplifier output end mismatch detection circuit and detection method thereof |
| CN107634725B (en) * | 2017-08-31 | 2021-09-10 | 深圳市远望谷信息技术股份有限公司 | Method and device for improving efficiency of power amplifier |
| CN109462382B (en) * | 2018-10-26 | 2022-07-29 | 京信网络系统股份有限公司 | Power amplification system, power measurement and control method, device and base station equipment |
| CN112383951B (en) * | 2020-11-16 | 2022-08-09 | 深圳国人无线通信有限公司 | Base station transmitting equipment and power supply management method thereof |
| CN112737609B (en) * | 2020-12-28 | 2022-05-17 | Oppo广东移动通信有限公司 | Radio frequency system, signal power control method, communication device, and storage medium |
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| CN101646228A (en) * | 2009-09-11 | 2010-02-10 | 上海华为技术有限公司 | Method and device for power control |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102480273A (en) | 2012-05-30 |
| WO2012068836A1 (en) | 2012-05-31 |
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