CN101316128B - Method for improving transmitter efficiency and transmitter - Google Patents
Method for improving transmitter efficiency and transmitter Download PDFInfo
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- CN101316128B CN101316128B CN2008101252733A CN200810125273A CN101316128B CN 101316128 B CN101316128 B CN 101316128B CN 2008101252733 A CN2008101252733 A CN 2008101252733A CN 200810125273 A CN200810125273 A CN 200810125273A CN 101316128 B CN101316128 B CN 101316128B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
- H03F1/0266—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A by using a signal derived from the input signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
The embodiment of the invention discloses a method for improving the efficiency of a transmitter, and the transmitter. The method includes the steps of: taking statistics on the average power of the input digital signal; slicing the input digital signal according to the average power obtained from the result of the statistics and the slice thresholds for different ratings of average power; adjusting the bias voltage of the power amplifier according to the average power obtained from the result of the statistics and the reference values of the bias voltage for different average power ratings. The method can effectively improve the efficiency of the transmitter.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and transmitter that improves transmitter frequency.
Background technology
Power amplifier is called for short power amplifier.The power amplifier performance of wireless base station is relevant with multiple factor, and these factors all might cause transmitter frequency lower.For example, the wireless base station has very big influence to the bias voltage that power amplifier applied of transmitter to transmitter frequency.
In order to improve transmitter frequency, in the prior art, adjust the bias voltage of transmitter power amplifier according to power output.When power output is big, need higher bias voltage to guarantee the linearity of power amplifier, reduce distorted signals; And when the business load rate was low, power output reduced, if the power amplifier offset point of this moment does not change, then power amplification efficiency is lower.Therefore,, take to reduce the method for the bias voltage of power amplifier usually, reduce quiescent dissipation when power amplifier power output hour.The bias voltage of power amplifier comprises grid voltage and leaks pressure, improve the power amplification efficiency under the low load factor, need the leakage pressure and the grid voltage of power amplifier be adjusted together usually.
But; In research and practice process to prior art; The inventor finds the above-mentioned method of passing through the bias voltage of adjustment power amplifier of prior art, still can not improve transmitter frequency effectively, and transmitter performance still can receive the influence of other factors; The influence that is brought like input signal peak-to-average force ratio (PAR, Peak to Average Radio).
Summary of the invention
The embodiment of the invention provides a kind of method and transmitter that improves transmitter frequency, can improve transmitter frequency effectively.
The method of improving transmitter frequency and transmitter embodiment that the embodiment of the invention provided realize through following technical scheme:
The embodiment of the invention provides a kind of method of improving the transmitter power amplification efficiency, and this method converts the digital signal of input analog signal into and outputs to power amplifier through transmission channel, and comprises:
The average power of the digital signal of statistics input;
According to the said average power that statistics obtains, handle according to the digital signal of said input being carried out slicing according to the set slicing thresholding of different average power level;
The said average power that obtains according to statistics is according to according to the set bias voltage reference value of different average power level the bias voltage of said power amplifier being adjusted.
The embodiment of the invention also provides a kind of transmitter, and this transmitter comprises digital analog converter, is used for the digital signal of input is converted into analog signal and outputs to power amplifier through transmission channel, and comprises:
The first power statistic device is used to add up the average power of the digital signal of said input;
The slicing processor is used for the average power exported according to the first power statistic device, according to according to the set slicing thresholding of different average power level the digital signal of said input being carried out outputing to said digital analog converter after slicing is handled;
Voltage controller is used for adding up the average power that obtains according to the said first power statistic device, according to according to the set bias voltage reference value of different average power level the bias voltage of power amplifier being adjusted.
Can find out from above technical scheme; Through adding up the average power of the digital signal of importing; And the average power that obtains according to statistics is according to according to the set bias voltage reference value of different power grade the bias voltage of power amplifier being adjusted; To reduce the power consumption of power amplifier, save equipment power dissipation; And the average power that obtains according to statistics is handled according to according to the set slicing thresholding of different power grade the digital signal of input being carried out slicing; After signal carried out slicing; Can reduce internal strength and put the requirement of the linearity transmitter; Make power amplifier can reduce rollback, therefore can improve transmitter frequency effectively.
Description of drawings
Fig. 1 is the block diagram of transmitter embodiment one in the embodiment of the invention;
Fig. 2 is for improving method embodiment one flow chart of transmitter frequency in the embodiment of the invention;
Fig. 3 is the block diagram of transmitter embodiment three in the embodiment of the invention;
Fig. 4 is the block diagram of the transmission channel of transmitter shown in Figure 3;
Fig. 5 is the block diagram of the feedback path of transmitter shown in Figure 3;
Fig. 6 is the closed loop adjustment gain theory diagram of transmitter shown in Figure 3.
Embodiment
The embodiment of the invention provides a kind of method and transmitter that improves transmitter frequency, can improve transmitter frequency effectively.
Clearer for the purpose, technical scheme and the advantage that make the embodiment of the invention, clear, below with reference to accompanying drawing, be described in detail through specific embodiment:
With reference to Fig. 1; Block diagram for transmitter embodiment one in the embodiment of the invention; Numeric field baseband I/Q signal process slicing processor 11 is after digital analog converter (DAC) 12 converts analog signal to; The analog signal of DAC13 output is sent into power amplifier (PA) 14 via transmission channel 13, and the signal of PA 14 outputs sends through antenna 15.
In order to reduce power consumption, improve transmitter frequency, the transmitter of embodiment one also comprises:
The first power statistic device 16 is used to add up the average power of the digital signal (numeric field baseband I/Q signal) of input;
Wherein, bias voltage comprises the grid voltage and leakage pressure of power amplifier.Slicing thresholding and power amplifier offset voltage reference value that set different power grade is corresponding different.
Below adopt above-mentioned transmitter to improve the method for transmitter frequency through specific embodiment explanation, with reference to Fig. 2, be method embodiment one flow chart that improves transmitter frequency in the embodiment of the invention, below be elaborated through concrete steps:
The average power of the digital signal of S101, statistics input;
S102, the said average power that obtains according to statistics are handled according to according to the set slicing thresholding of different average power level the digital signal of said input being carried out slicing;
S103, the said average power that obtains according to statistics are according to according to the set bias voltage reference value of different average power level the bias voltage of said power amplifier being adjusted.
Can find out; This transmitter is through the average power of the baseband signal of statistics input; And carry out slicing by the average power that the slicing processor obtains according to statistics according to the pairing slicing thresholding of average power level that is provided with and handle; Adjust according to the pairing bias voltage of average power level that is provided with according to the average power that statistics obtains by voltage controller, can improve transmitter frequency effectively.
In order further to improve transmitter performance, can adjust the gain of the digital signal of input, below through the specific embodiment explanation:
The fluctuation that transmitter embodiment two, the mode through open loop gain when compensating voltage adjustment of the power amplifier is promptly controlled voltage to the preset compensation rate of different output power grade, this scheme can be when producing the equipment mode of making table realize.Suppose that the power amplifier gain is constant; Obtain the bias voltage value under the different capacity grade, and actual in the factory test process, it is not stable that power amplifier gains in pressure regulation; Can be through on former bias voltage basis, adjusting; In case gain reaches stationary value, just notes voltage deviation at that time, write according to forms such as forms in the memory device of base station (power down information is not lost).In equipment running process; Voltage controller 17 is when carrying out Regulation Control; Also be used for bias voltage offset amount according to the correspondence of storing in advance; Upgrade among the transmitter embodiment one according to the set bias voltage reference value of different average power level, and the bias voltage of PA14 is adjusted according to the bias voltage reference value after upgrading.Bias voltage offset amount according to the correspondence of storing in advance; Upgrade among the transmitter embodiment one according to the set bias voltage reference value of different average power level be specially with stored voltage gain offset amount in advance with according to the set bias voltage reference value addition of different average power level, upgrade said according to the set bias voltage reference value of different average power level.
Transmitter embodiment three, employing closed-loop fashion are adjusted gain, with reference to Fig. 3, are the block diagram of transmitter embodiment three in the embodiment of the invention:
Numeric field baseband I/Q signal converts analog signal to through digital analog converter (DAC) 33 after through slicing processor 31, the second power statistic device 32; The analog signal of DAC 33 outputs is sent into power amplifier (PA) 35 via transmission channel 34; Power amplifier output signal is sent into feedback path 37 after being coupled through coupler 36; After the radiofrequency signal of feedback becomes analog intermediate frequency or analog baseband signal after through feedback path 37; Send into the second power statistic device 32 after converting digital signal to through analog-digital converter (ADC) 38, form the closed circuit of emission and feedback path.
The above-mentioned second power statistic device 32; Be used to add up the power of the digital signal (numeric field baseband I/Q signal) after slicing is handled and the power of the signal that feedback path 37 returns; The actual gain of the digital signal that obtains importing; And according to the actual gain of the digital signal of target gain that is provided with and input, the adjustment transmission channel is to the gain of input signal.
With reference to Fig. 4, be the block diagram of the transmission channel shown in Fig. 3, transmission channel 34 can comprise modulator or upconverter 341, wherein:
If transmitter adopts the zero intermediate frequency mode, transmission channel comprises modulator, is modulated on the carrier frequency by the ABB i/q signal of modulator with DAC 33 outputs, sends through antenna 39.
If transmitter adopts digital intermediate frequency mode, transmission channel 34 can comprise upconverter, and upconverter also can be called frequency mixer, with upconverting on the carrier frequency after the analog if signal of DAC 33 outputs and the local oscillation signal mixing.
Because the signal power of modulator or upconverter output is less, therefore, redispatches to power amplifier behind what amplifier of cascade in the back.With reference to the amplifier among Fig. 4 342.
In order to adjust gain, can adopt analog attenuator or variable gain amplifier 343.
With reference to Fig. 5; Block diagram for the feedback path shown in Fig. 3; Corresponding to transmission channel 34, feedback path 37 can comprise low-converter or analog demodulator 371, is used for the radiofrequency signal of power amplifier coupling is down-converted to analog if signal or is transformed into the ABB i/q signal through demodulator; The effect of said low-converter is opposite with the effect of upconverter, and the effect of demodulator is opposite with the effect of modulator.Analog signal is carried out the conversion of analog to digital signal through after the filtering through ADC.
In addition, feedback path also can comprise amplifier 372.
Disturb in order to reduce signal, filter 344 and filter 373 can also be set in transmission channel 34 and feedback path 37.The device that dots among Fig. 4 and Fig. 5 is represented optional.
With reference to Fig. 6, be closed loop adjustment gain theory diagram shown in Figure 3, its principle of following brief description:
If the power output of slicing processor 31 is P
Din, the gain of whole transmission channel and PA35 is G
F, the signal power of establishing power amplifier output is P
Out, P
Din+ G
F=P
OutIf the feedback path overall gain is G
R, the digital power of the second power statistic device, 32 statistics feedback path feedback signals is P
R, P then
R-G
R=P
OutWherein, G
RAnd G
FCan proofread and correct through production equipment, be a fixed value.If the power amplifier power output is 47.2dBm, the numeric field power of corresponding power amplifier output 47.2dBm is P
DinIf channel gain does not change, P then
Din+ G
F, can guarantee that power output is 47.2dBm, P
R-G
RThe actual power of corresponding power amplifier output.Common power amplifier gain can change during pressure regulation, so P
Din+ G
FWith P
R-G
RNormally unequal.This moment, the second power statistic device 32 can count change in gain value: P
Din+ G
F-(P
R-G
R), and faders such as attenuator on the adjustment transmission channel or variable gain amplifier, this implementation is for to realize on analog channel.
It is understandable that; Also can be through gaining in the numeric field adjustment; At this moment only need obtain the actual gain of the digital signal of said input by the power of the said digital signal after the 32 statistics slicings processing of the second power statistic device and the power of the signal that feedback path returns; And, the digital power of said supplied with digital signal is adjusted, with the gain of adjustment to the digital signal of said input according to the actual gain of the digital signal of target gain that is provided with and said input.When numeric field adjustment gain, the circuit or the device that need not have gain-adjusted such as attenuator or variable gain amplifier on the transmission channel.
Below adopt above-mentioned transmitter to improve the method for transmitter frequency through idiographic flow explanation:
In order further to improve transmitter performance, on the basis of method embodiment one, can also adjust the gain of input signal:
The power of the digital signal after the statistics slicing is handled and the power of the signal that feedback path returns, the actual gain of the digital signal that obtains importing;
Can the digital power of supplied with digital signal be adjusted, with the gain of adjustment according to the actual gain of the digital signal of target gain that is provided with and input the digital signal of input.
Also can be according to the actual gain of the digital signal of target gain that is provided with and said input, the adjustment transmission channel is to the gain of input signal.According to the gain of the actual gain adjustment transmission channel of the digital signal of target gain that is provided with and said input to input signal; Be specially: according to the actual gain of the digital signal of target gain that is provided with and input, attenuator on the control transmission channel or variable gain amplifier are with the gain of adjustment transmission channel to input signal.
Certainly; Except that said method; Also can only add up the average power of supplied with digital signal; Reach the bias voltage offset amount of the correspondence of storage in advance according to the set bias voltage reference value of different average power level, the bias voltage of power amplifier is adjusted, with of the gain of adjustment power amplifier input signal.
More than through concrete application the clear method of improving transmitter frequency; It is understandable that; Said method of the embodiment of the invention and transmitter are applicable to UMTS (Universal MobileTelecommunications System; UMTS), the base station or the terminal equipment of different systems such as CDMA2000 (Code DivisionMultiple Access 2000, WCDMA inserts 2000), LTE (Long Time Evolution, long-term evolving network), Wimax.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; This program comprises the steps: when carrying out
The average power of the digital signal of statistics input;
According to the said average power that statistics obtains, handle according to the digital signal of said input being carried out slicing according to the set slicing thresholding of different average power level;
The said average power that obtains according to statistics is according to according to the set bias voltage reference value of different average power level the bias voltage of said power amplifier being adjusted.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than a kind of method and apparatus that improves transmitter frequency provided by the present invention has been carried out detailed introduction; For one of ordinary skill in the art; Thought according to the embodiment of the invention; The part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a method of improving transmitter frequency comprises that the digital signal with input converts analog signal into and outputs to power amplifier through transmission channel, it is characterized in that, also comprises:
The average power of the digital signal of statistics input;
According to the said average power that statistics obtains, handle according to the digital signal of said input being carried out slicing according to the set slicing thresholding of different average power level;
The said average power that obtains according to statistics is according to according to the set bias voltage reference value of different average power level the bias voltage of said power amplifier being adjusted.
2. the method for improving transmitter frequency as claimed in claim 1 is characterized in that, further comprises:
Gain to the digital signal of said input is adjusted.
3. the method for improving transmitter frequency as claimed in claim 2 is characterized in that, the method that the gain of said digital signal to said input is adjusted is specially:
Add up the power of the said digital signal after slicing is handled and the power of the signal that feedback path returns, obtain the actual gain of the digital signal of said input;
According to the actual gain of the digital signal of target gain that is provided with and said input, the digital power of said supplied with digital signal is adjusted, with the gain of adjustment to the digital signal of said input.
4. the method for improving transmitter frequency as claimed in claim 2 is characterized in that, the method that the gain of said digital signal to said input is adjusted is specially:
Add up the power of the said digital signal after slicing is handled and the power of the signal that feedback path returns, obtain the actual gain of the digital signal of said input;
According to the actual gain of the digital signal of target gain that is provided with and said input, the adjustment transmission channel is to the gain of input signal.
5. the method for improving transmitter frequency as claimed in claim 4 is characterized in that, the actual gain adjustment transmission channel of said digital signal according to target gain that is provided with and said input is specially the gain of input signal:
According to the actual gain of the digital signal of target gain that is provided with and said input, attenuator on the control transmission channel or variable gain amplifier are with the gain of adjustment transmission channel to input signal.
6. the method for improving transmitter frequency as claimed in claim 2 is characterized in that, the gain of said digital signal to said input is adjusted, and is specially:
Reach the bias voltage offset amount of the correspondence of storage in advance according to said according to the set bias voltage reference value of different average power level, the bias voltage of power amplifier is adjusted, with of the gain of adjustment power amplifier input signal.
7. a transmitter comprises digital analog converter, is used for the digital signal of input is converted into analog signal and outputs to power amplifier through transmission channel, it is characterized in that, also comprises:
The first power statistic device is used to add up the average power of the digital signal of said input;
The slicing processor is used for the average power exported according to the first power statistic device, according to according to the set slicing thresholding of different average power level the digital signal of said input being carried out outputing to said digital analog converter after slicing is handled;
Voltage controller is used for adding up the average power that obtains according to the said first power statistic device, according to according to the set bias voltage reference value of different average power level the bias voltage of power amplifier being adjusted.
8. transmitter as claimed in claim 7 is characterized in that, also comprises:
The second power statistic device; Be used to add up the power of the said digital signal after slicing is handled and the power of the signal that feedback path returns; Obtain the actual gain of the digital signal of said input; And according to the actual gain of the digital signal of target gain that is provided with and said input, the adjustment transmission channel is to the gain of input signal.
9. transmitter as claimed in claim 8 is characterized in that said transmission channel comprises variable gain amplifier or attenuator, is used for haircuting in the control of second power statistic device downward modulation penetrating the gain of passage to input signal.
10. transmitter as claimed in claim 7; It is characterized in that, also comprise: the second power statistic device is used to add up the power of the said digital signal after slicing is handled and the power of the signal that feedback path returns; Obtain the actual gain of the digital signal of said input; And, the digital power of said supplied with digital signal is adjusted, with the gain of adjustment to the digital signal of said input according to the actual gain of the digital signal of target gain that is provided with and said input.
11. transmitter as claimed in claim 7; It is characterized in that; Said voltage controller also is used for the bias voltage offset amount according to the correspondence of storing in advance; Upgrade saidly, and the bias voltage of power amplifier is adjusted according to the bias voltage reference value after upgrading according to the set bias voltage reference value of different average power level.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101252733A CN101316128B (en) | 2008-06-30 | 2008-06-30 | Method for improving transmitter efficiency and transmitter |
| PCT/CN2009/072443 WO2010000184A1 (en) | 2008-06-30 | 2009-06-25 | Method for improving efficiency of transmitter and transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101252733A CN101316128B (en) | 2008-06-30 | 2008-06-30 | Method for improving transmitter efficiency and transmitter |
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| Publication Number | Publication Date |
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| CN101316128A CN101316128A (en) | 2008-12-03 |
| CN101316128B true CN101316128B (en) | 2012-07-04 |
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| CN2008101252733A Active CN101316128B (en) | 2008-06-30 | 2008-06-30 | Method for improving transmitter efficiency and transmitter |
Country Status (2)
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| CN (1) | CN101316128B (en) |
| WO (1) | WO2010000184A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101316128B (en) * | 2008-06-30 | 2012-07-04 | 华为技术有限公司 | Method for improving transmitter efficiency and transmitter |
| CN102033555B (en) * | 2010-12-17 | 2014-07-16 | 中兴通讯股份有限公司 | Power amplifier voltage regulation method and device in LTE system |
| WO2011100922A2 (en) | 2011-04-14 | 2011-08-25 | 华为技术有限公司 | Method and apparatus for reducing power cost of power amplifier |
| CN102412788B (en) * | 2011-11-03 | 2015-06-10 | 深圳市国人射频通信有限公司 | Repeater system, method and device for increasing efficiency of repeater |
| CN102647774A (en) * | 2012-04-09 | 2012-08-22 | 京信通信系统（中国）有限公司 | Adaptive timeslot turn-off method and device of GSM (Global System For Mobile Communication) power amplification system |
| CN105471446A (en) * | 2014-09-04 | 2016-04-06 | 中兴通讯股份有限公司 | Power amplification processing method and device |
| CN105611620B (en) * | 2014-11-20 | 2020-03-17 | 中兴通讯股份有限公司 | Power amplifier voltage adjusting method and device |
| CN113993187A (en) * | 2020-07-27 | 2022-01-28 | 中国移动通信有限公司研究院 | Communication energy-saving method and base station |
| CN114679774B (en) * | 2022-04-02 | 2023-04-04 | 上海星思半导体有限责任公司 | Method, device and system for adjusting transmission parameters |
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| CN1199943A (en) * | 1997-05-12 | 1998-11-25 | 美国电报电话公司 | Current control for analog optical link |
| CN1645731A (en) * | 2004-01-19 | 2005-07-27 | 厦门科华恒盛股份有限公司 | Regulating method and device for sine wave dc-to-ac converter bias magnet |
| CN101068233A (en) * | 2007-07-05 | 2007-11-07 | 华为技术有限公司 | Method and device for reducing signal peak-to-average power ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001284998A (en) * | 2000-03-31 | 2001-10-12 | Mitsubishi Electric Corp | Wireless transmitter |
| CN1141003C (en) * | 2002-01-08 | 2004-03-03 | 北京星河亮点通信软件有限责任公司 | Method based on joint transmission and predistortion technique for processing signals to be transmitted |
| CN100382454C (en) * | 2003-12-08 | 2008-04-16 | 华为技术有限公司 | Equipment and method for stabilizing output power in base station |
| JP4283294B2 (en) * | 2006-09-20 | 2009-06-24 | 株式会社日立国際電気 | Doherty amplifier |
| CN101316128B (en) * | 2008-06-30 | 2012-07-04 | 华为技术有限公司 | Method for improving transmitter efficiency and transmitter |
-
2008
- 2008-06-30 CN CN2008101252733A patent/CN101316128B/en active Active
-
2009
- 2009-06-25 WO PCT/CN2009/072443 patent/WO2010000184A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199943A (en) * | 1997-05-12 | 1998-11-25 | 美国电报电话公司 | Current control for analog optical link |
| CN1645731A (en) * | 2004-01-19 | 2005-07-27 | 厦门科华恒盛股份有限公司 | Regulating method and device for sine wave dc-to-ac converter bias magnet |
| CN101068233A (en) * | 2007-07-05 | 2007-11-07 | 华为技术有限公司 | Method and device for reducing signal peak-to-average power ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010000184A1 (en) | 2010-01-07 |
| CN101316128A (en) | 2008-12-03 |
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