CN101873284B - Digital predistortion system and temperature compensation method in digital predistortion system - Google Patents
Digital predistortion system and temperature compensation method in digital predistortion system Download PDFInfo
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Abstract
The invention relates to a temperature compensation method in a digital predistortion system, which comprises the following steps: acquiring power and temperature value in a feedback link digital domain, and establishing a temperature compensation table according to the acquired data; before a digital predistortion algorithm is started, adjusting the gain of a forward radio-frequency link and theoutput gain of a digital predistortion module, and adjusting the gain of the feedback radio-frequency link and the gain of a digital temperature compensation module; starting the digital predistortion algorithm; when the temperature variation is greater than a threshold, updating the gain of the digital temperature compensation module according to the temperature compensation table, thereby meeting the requirements for power control precision. The invention also provides a digital predistortion system. The invention can be used for realizing high-precision power control to meet the requirements of the system through precision requirements in every step.
Description
Technical field
The present invention relates to the digital pre-distortion system in the mobile communication technology, be specifically related to method and a kind of digital pre-distortion system of temperature-compensating in a kind of digital pre-distortion system.
Background technology
Along with the continuous development of mobile communication system, to the also raising day by day of energy-saving and emission-reduction requirement of mobile communication equipment.This just requires mobile communication equipment under the prerequisite of equal-wattage output, possesses higher system effectiveness.The principal element of system for restricting efficient is the power amplifier module in the transmitting chain now.In order to improve the efficient of system, people have proposed multiple software and hardware system frameworks such as analog predistortion and digital pre-distortion, compensate at the nonlinear model of power amplifier, improve the output characteristic of power amplifier, improve the efficient of power amplifier.
Along with the continuous maturation of digital pre-distortion technology, present high efficiency communication overlay system has all adopted the digital pre-distortion algorithm.General digital pre-distortion system comprises digital pre-distortion module, forward link and based on feedback link.Forward link comprises digital to analog converter, intermediate frequency filtering and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and the duplexer filter that connects successively; Wherein, intermediate frequency filtering and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and the duplexer filter that connects successively constituted the forward direction radio frequency link.Based on feedback link comprises back coupler, filtering and amplification module, frequency mixer, intermediate-frequency filter, the analog to digital converter that connects successively and the digital temperature compensating module that is used for feeding back at the numeric field fine compensation radio frequency link change in gain; Wherein, back coupler is coupled out one road signal to based on feedback link from the power amplifier of forward direction radio frequency link; The filtering of Lian Jieing and amplification module, frequency mixer and intermediate-frequency filter have constituted the feedback radio frequency link successively.The digital pre-distortion module by being connected with the digital to analog converter of forward link and the digital temperature compensating module of based on feedback link, constitutes a complete loop respectively.Because digital pre-distortion algorithm closed power control procedure, there are bigger difference in precision control and the covering system in the past of its down output power.
Traditional simulated power temperature compensation is primarily aimed at power amplifier to carry out, and this method not only compensation precision is low but also have the problem of conformity of production difference, and the few price of high-precision power tube number of devices is also comparatively expensive in addition.Because there are certain difference in the temperature characterisitic of power amplifier and the temperature characterisitic of whole link, so compensating power amplifier only is difficult to satisfy the requirement for system's high accuracy output.Because analogue device has the characteristic that works long hours and can wear out, this causes analog temperature compensation to be difficult to possess long-time reliability, thereby makes the precision of temperature-compensating can not get guaranteeing.
And digital pre-distortion technology be owing to need carry out nonlinear operation to forward direction baseband signal and feedback signal, and the control of its system's power output can be controlled in whole digital pre-distortion loop.The based on feedback link of digital pre-distortion system does not have high power amplifier spare, and it is better with the variation of temperature curve conformity to gain, and fluctuation range is also smaller.So, in the digital pre-distortion system based on feedback link is carried out temperature-compensating at numeric field, can remedy the defective of forward link analog temperature compensation, but there is considerable influence in the numeric field power back-off of great dynamic range to the stability of digital pre-distortion algorithms, makes the precision of temperature-compensating can not get guaranteeing.
Summary of the invention
The objective of the invention is to, propose method and a kind of digital pre-distortion system of temperature-compensating in a kind of digital pre-distortion system, realize high-precision power control, guarantee the effect of temperature-compensating, satisfy the requirement of system.
The present invention proposes the method for temperature-compensating in a kind of digital pre-distortion system, comprising:
Step S1 will feed back radio frequency link and temperature collect module is positioned in the high-low temperature chamber, and receive range of temperature and rate temperature change curve that user instruction arranges high-low temperature chamber;
Step S2, the gain that the digital temperature compensating module is set is fixed value, and the coupled power size equals to feed back the signal of coupled power to based on feedback link when system is maximum to be exported;
Step S3, the temperature value of when variations in temperature, gathering the numeric field power of described based on feedback link and the described feedback radio frequency link line item of going forward side by side; Match as a result obtains corresponding curve according to record, and obtains temperature compensation table according to this correspondence curve calculation;
Step S4, the output gain of the radio frequency link gain of adjustment forward direction and digital pre-distortion module;
Step S5 adjusts the gain of described feedback radio frequency link gain and described digital temperature compensating module; The gain that current digital temperature compensation module is set then is G
1, read the starter system temperature T of collection
1And according to T
1Search corresponding numeric field power P in described temperature compensation table
1
Step S6, operation digital pre-distortion algorithm is also gathered the system temperature T that changes
2, as system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, search and T in described temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of described digital temperature compensating module
2, the gain of described digital temperature compensating module is updated to G
2And storage temperature T
2
The present invention also proposes a kind of digital pre-distortion system simultaneously, this digital pre-distortion system respectively be used for high-low temperature chamber that analog temperature changes, be used for carrying out the PC that data handle and link to each other;
Described digital pre-distortion system comprises forward link, based on feedback link, is used for the digital pre-distortion module of digital pre-distortion algorithm power control, is used for gathering the temperature collect module of feedback radio frequency link temperature data and the monitoring control module that is used for each module is carried out condition monitoring, control and data read; Described forward link comprises for baseband signal being carried out filtering, modulation and amplifying the forward direction radio frequency link of handling; Described based on feedback link comprises for described feedback radio frequency link change in gain being realized the digital temperature compensating module of numeric field fine compensation and being used for feedback signal is carried out the described feedback radio frequency link that filtering, mixing and amplification are handled;
After described feedback radio frequency link and described temperature collect module were placed on the high-low temperature chamber the inside, described high-low temperature chamber received user instruction range of temperature and rate temperature change curve is set;
The gain that described monitoring control module arranges the digital temperature compensating module is fixed value, and the signal of feedback coupled power is to based on feedback link when equaling the maximum output of system by described forward link coupled power size then;
When variations in temperature, described digital pre-distortion module is gathered the numeric field power of described based on feedback link, described temperature collect module is gathered the temperature value of described feedback radio frequency link, and described monitoring control module reads described numeric field power and described temperature value and is sent to PC; Described PC records described numeric field power and described temperature value, and match as a result obtains corresponding curve according to record again, and obtains temperature compensation table according to this correspondence curve calculation;
Described monitoring control module is adjusted the output gain of the gain of forward direction radio frequency link and digital pre-distortion module earlier, adjusts the gain of described feedback radio frequency link gain and described digital temperature compensating module again; The gain of current digital temperature compensation module is set is default value G to described monitoring control module then
1, read the starter system temperature T that described temperature collect module is gathered
1And with the T that reads
1Be sent to described PC; Described PC is according to T
1Search corresponding numeric field power P in described temperature compensation table
1
Described digital pre-distortion module operation digital pre-distortion algorithm, the system temperature T that described temperature collect module collection changes
2As system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, described monitoring control module reads T
2And with T
2Be sent to described PC; Described PC is searched and T in described temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of described digital temperature compensating module
2, and with new gain G
2Be sent to described monitoring control module; Described monitoring control module is updated to G with the gain of described digital temperature compensating module
2And storage temperature T
2
For realizing that high-precision power controls this goal of the invention, the present invention realizes this process stage by stage.The power precision that supposing the system reaches in advance for+/-(x+y+z) dB, the present invention changes by analog temperature makes digital pre-distortion system in the work of predetermined temperature excursion, the gain that the digital temperature compensating module is set then is that fixed value remains unchanged the change in gain of feedback radio frequency link, and by system works stability and the satisfactory signal of reliability requirement coupled power to based on feedback link, when variations in temperature, gather the data of numeric field power and temperature value, can obtain compensation precision to reach+/-temperature compensation table of x dB, next adjust forward link make the power output precision satisfy+/-y dB; Adjust again based on feedback link make the base band power of forward link and feedback base band power difference less than+/-z dB, make system reach the initial condition that can compensate, digital pre-distortion algorithm and change the renewal of carrying out the gain of feedback digital temperature compensation module in conjunction with temperature compensation table according to system temperature then brings into operation, make the final power precision that realizes of the present invention reach+/-(x+y+z) dB, satisfy the requirement of system.
Description of drawings
Fig. 1 is the method flow diagram of temperature-compensating in the digital pre-distortion system;
The connection diagram that Fig. 2 is connected with high-low temperature chamber, PC respectively for digital pre-distortion system;
Fig. 3 forms schematic diagram for digital pre-distortion system;
Fig. 4 forms schematic diagram for the forward direction radio frequency link;
Fig. 5 forms schematic diagram for the feedback radio frequency link.
Embodiment
Embodiment 1:
The digital pre-distortion system that present embodiment relates to comprises digital pre-distortion module, forward link and based on feedback link.Forward link comprises digital to analog converter, intermediate frequency filtering and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and the duplexer filter that connects successively; Wherein, intermediate frequency filtering and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and the duplexer filter that connects successively constituted the forward direction radio frequency link.Based on feedback link comprises back coupler, filtering and amplification module, frequency mixer, intermediate-frequency filter, the analog to digital converter that connects successively and the digital temperature compensating module that is used for feeding back at the numeric field fine compensation radio frequency link change in gain; Wherein, back coupler is coupled out one road signal to based on feedback link from the power amplifier of forward direction radio frequency link; The filtering of Lian Jieing and amplification module, frequency mixer and intermediate-frequency filter have constituted the feedback radio frequency link successively.The digital pre-distortion module by being connected with the digital to analog converter of forward link and the digital temperature compensating module of based on feedback link, constitutes a complete loop respectively.
Present embodiment is example with above-mentioned digital pre-distortion system, proposes the method for temperature-compensating in a kind of digital pre-distortion system, as shown in Figure 1, comprising:
Step S1, with each module in temperature collect module and the feedback radio frequency link, comprise filtering and amplification module, frequency mixer and intermediate-frequency filter are interior, be positioned in the high-low temperature chamber together, and the reception user instruction arranges range of temperature and the rate temperature change curve of high-low temperature chamber, high-low temperature chamber is gradually changed in the required satisfied variation of ambient temperature scope of digital pre-distortion system, reach analog digital pre-distortion system situation of based on feedback link change in gain when working in the range of temperature of design, thereby obtain the relation of based on feedback link gain and variations in temperature.
Step S2, the gain that the digital temperature compensating module is set is fixed value, because the digital temperature compensating module, is then also fixed the compensation of based on feedback link after its yield value is set to fixed value in numeric field fine compensation feedback radio frequency link change in gain.The coupled power size equals to feed back the signal of coupled power to based on feedback link when system is maximum to be exported then.According to the requirement of verification system job stability and reliability, need the nominal peak power output of use system, so herein the signal that meets the demands of coupled power size to based on feedback link.
Step S3, T represents variations in temperature with Δ, then gathers the numeric field power of based on feedback link and the temperature value of feedback radio frequency link, the corresponding relation of based on feedback link numeric field power and Current Temperatures when obtaining open loop like this during every change Delta T.Based on feedback link numeric field power and the temperature value of record acquisition then; Match as a result obtains the corresponding curve of based on feedback link numeric field power and temperature value according to record, by the required precision of system's design, obtains temperature compensation table according to this correspondence curve calculation again.Herein for match as a result obtains the process of corresponding curve according to record, it can be the polynomial expression formula that obtains corresponding curve according to the The data fitting of a polynomial algorithm match of record, obtain temperature compensation table according to polynomial computation then, the data of record are more accurate, and then the precision of temperature compensation table is more high.In the present embodiment, the data by gathering, the precision of temperature compensation table is reached+/-x dB.Wherein, x herein represents the required precision that need reach not constitute limitation of the invention.
Step S4, digital pre-distortion system before being not activated the digital pre-distortion algorithm, carries out the adjustment of forward direction power output earlier after starting, comprise the output gain of adjusting the gain of forward direction radio frequency link and digital pre-distortion module, make current system's power output absolute value satisfy system's designing requirement.At first, according to predetermined demanded power output, in filtering and amplification module, adjust the gain of forward direction radio frequency link, make the power output precision satisfy+/-A dB; In the digital pre-distortion module, adjust output gain then, namely adjust output baseband signal power, make output accuracy reach+/-y dB.Wherein, A herein and y represent the required precision that need reach not constitute limitation of the invention.After this step was finished, digital pre-distortion system had the initial power of a benchmark.
Step S5 then after the step S4, adjusts the gain of the gain of feedback radio frequency link and digital temperature compensating module, finishes based on feedback link base band power calibration process by this two places adjustment, makes the base band power of the base band power of forward link and based on feedback link consistent.The gain that current digital temperature compensation module is set then is G
1, read the starter system temperature T of collection
1And according to T
1Search corresponding numeric field power P in temperature compensation table
1At first, adjust the gain of feedback radio frequency link, the base band power difference that makes the base band power of forward link and based on feedback link less than+/-B dB, this is the process of coarse adjustment; Then, adjust the gain of digital temperature compensating module, the base band power difference that makes the base band power of forward link and based on feedback link less than+/-z dB, this is the process of fine tuning.Wherein, B herein and z represent the required precision that need reach not constitute limitation of the invention.After this step was finished, the base band power of digital pre-distortion system forward link can reach consistent with the base band power of based on feedback link.
Step S6, operation digital pre-distortion algorithm, the purpose that starts the digital pre-distortion algorithm herein be because, the digital pre-distortion algorithm has determined to start the whole forward link in back and based on feedback link can form a closed-loop control, the gain compensation of based on feedback link just can be used as the compensation of system.Gather the system temperature T that changes then
2, as system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, search and T in temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of digital temperature compensating module
2, the gain of digital temperature compensating module is updated to G
2And storage temperature T
2
In the above-described embodiments, the precision of the temperature compensation table of foundation can reach+/-x dB; And after forward link power adjusted, can make forward link power output precision reach+/-y dB; After based on feedback link being carried out the base band power calibration, the difference that can make based on feedback link base band power and forward link base band power less than+/-z dB, when changing, upgrades system temperature the gain of digital temperature compensating module then in conjunction with temperature compensation table, the precision of final power control can be reached+/-(x+y+z) dB, thus satisfy the requirement of system.
As the further improvement of above-described embodiment, after step S6, also comprise step: whether continue supervisory control system temperature and detection system variations in temperature greater than predetermined threshold value; If then search and current system temperature T in temperature compensation table greater than threshold value
NCorresponding numeric field power P
N, according to formula G
N=G+ (P
N-P) calculate the new gain G of digital temperature compensating module
N, the gain G of digital temperature compensating module is updated to new gain G
NAnd storage temperature T
NWherein, the gain of the digital temperature compensating module that once upgrades before G represents, P is illustrated in numeric field power corresponding with the preceding system temperature of once preserving in the temperature compensation table.Like this, according to variation of temperature, constantly the offset of the digital temperature compensating module of Adjustment System reaches the better effect of power precision control.
Embodiment 2:
Present embodiment proposes a kind of digital pre-distortion system, this digital pre-distortion system respectively be used for high-low temperature chamber that analog temperature changes, be used for carrying out the PC that data handle and link to each other, the connection situation is as shown in Figure 2.
Digital pre-distortion system comprises forward link, based on feedback link, is used for the digital pre-distortion module of digital pre-distortion algorithm power control, the temperature collect module that is used for collection feedback radio frequency link temperature data and the monitoring control module that is used for each module is carried out condition monitoring, control and data read as shown in Figure 3.
Forward link comprises digital to analog converter, intermediate frequency filtering and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and the duplexer filter that connects successively; Wherein, as shown in Figure 4, the intermediate frequency filtering of Lian Jieing and modulation module, analog temperature compensation module, filtering and amplification module, power amplifier and duplexer filter have constituted the forward direction radio frequency link that baseband signal is carried out filtering, modulation and amplification processing successively.
Based on feedback link comprises back coupler, filtering and amplification module, frequency mixer, intermediate-frequency filter, the analog to digital converter that connects successively and the digital temperature compensating module that is used for feeding back at the numeric field fine compensation radio frequency link change in gain; Wherein, back coupler is coupled out one road signal to based on feedback link from the power amplifier of forward direction radio frequency link.As shown in Figure 5, the filtering that connects successively and amplification module, frequency mixer and intermediate-frequency filter have constituted the feedback radio frequency link that is used for feedback signal is carried out filtering, mixing and amplification processing.In digital pre-distortion system, the digital pre-distortion module by being connected with the digital to analog converter of forward link and the digital temperature compensating module of based on feedback link, constitutes a complete loop respectively.The monitoring control module is connected with digital pre-distortion module, digital temperature compensating module, temperature collect module respectively.
Each module in temperature collect module and feedback radio frequency link, comprise filtering and amplification module, frequency mixer and intermediate-frequency filter, after being placed on the high-low temperature chamber the inside together, high-low temperature chamber receives user instruction range of temperature and rate temperature change curve is set, high-low temperature chamber is gradually changed in the required satisfied variation of ambient temperature scope of digital pre-distortion system, reach analog digital pre-distortion system situation of based on feedback link change in gain when working in the range of temperature of design, thereby obtain the relation of based on feedback link gain and variations in temperature.
The gain that the monitoring control module arranges the digital temperature compensating module is fixed value, because the digital temperature compensating module is in numeric field fine compensation feedback radio frequency link change in gain, after its yield value is set to fixed value, then the compensation of based on feedback link is also fixed.The signal of feedback coupled power is to based on feedback link when equaling the maximum output of system by forward link coupled power size then.According to the requirement of verification system job stability and reliability, need the nominal peak power output of use system, so herein the signal that meets the demands of coupled power size to based on feedback link.
T represents variations in temperature with Δ, when variations in temperature Δ T, the digital pre-distortion module is gathered the numeric field power of based on feedback link, the temperature value of temperature collect module collection feedback radio frequency link, the corresponding relation of based on feedback link numeric field power and Current Temperatures when obtaining open loop like this.The monitoring control module reads numeric field power and temperature value and is sent to PC; PC record numeric field power and temperature value, match as a result obtains corresponding curve according to record.By the required precision of system's design, obtain temperature compensation table according to this correspondence curve calculation again.Herein for match as a result obtains the process of corresponding curve according to record, can be by the software on the PC, obtain the polynomial expression formula of corresponding curve according to the The data fitting of a polynomial algorithm match of record, obtain temperature compensation table according to polynomial computation then, the data of record are more accurate, and then the precision of temperature compensation table is more high.In the present embodiment, the data by gathering, the precision of temperature compensation table is reached+/-x dB.Wherein, x herein represents the required precision that need reach not constitute limitation of the invention.
After digital pre-distortion system starts, before being not activated the digital pre-distortion algorithm, the monitoring control module is carried out the adjustment of forward direction power output earlier, comprise the output gain of adjusting the gain of forward direction radio frequency link and digital pre-distortion module, make current system's power output absolute value satisfy system's designing requirement.At first, according to predetermined demanded power output, the monitoring control module sends to instruct adjusts the gain of forward direction radio frequency link to filtering and amplification module, make the power output precision satisfy+/-A dB; Monitor control module then and send to instruct and adjust output gain to the digital pre-distortion module, namely adjust output baseband signal power, make output accuracy reach+/-ydB.Wherein, A herein and y represent the required precision that need reach not constitute limitation of the invention.After this step was finished, digital pre-distortion system had the initial power of a benchmark.
Adjust the gain of the gain of feedback radio frequency link and digital temperature compensating module, finish based on feedback link base band power calibration process by this two places adjustment, make the base band power of the base band power of forward link and based on feedback link consistent.Monitoring the gain that control module arranges current digital temperature compensation module then is default value G
1, read the starter system temperature T that temperature collect module is gathered
1And with the T that reads
1Be sent to PC; PC is according to T
1Search corresponding numeric field power P in temperature compensation table
1The monitoring control module sends instruction to feeding back the gain of radio frequency link adjustment feedback radio frequency link, the base band power difference that makes the base band power of forward link and based on feedback link less than+/-B dB, this is the process of coarse adjustment; Then, the monitoring control module sends instructs the gain of adjusting the digital temperature compensating module to the digital temperature compensating module, the base band power difference that makes the base band power of forward link and based on feedback link less than+/-z dB, this is the process of fine tuning.Wherein, B herein and z represent the required precision that need reach not constitute limitation of the invention.After this step was finished, the base band power of digital pre-distortion system forward link can reach consistent with the base band power of based on feedback link.
Digital pre-distortion module operation digital pre-distortion algorithm, the digital pre-distortion algorithm has determined to start the whole forward link in back and based on feedback link can form a closed-loop control, and the gain compensation of based on feedback link just can be used as the compensation of system.The system temperature T that the temperature collect module collection changes
2As system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, the monitoring control module reads T
2And with T
2Be sent to PC; PC is searched and T in temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of digital temperature compensating module
2, and with new gain G
2Be sent to the monitoring control module; The monitoring control module is updated to G with the gain of digital temperature compensating module
2And storage temperature T
2
In the above-described embodiments, the precision of the temperature compensation table of foundation can reach+/-x dB; And after forward link power adjusted, can make forward link power output precision reach+/-y dB; After based on feedback link being carried out the base band power calibration, the difference that can make based on feedback link base band power and forward link base band power less than+/-z dB, when changing, upgrades system temperature the gain of digital temperature compensating module then in conjunction with temperature compensation table, the precision of final power control can be reached+/-(x+y+z) dB, thus satisfy the requirement of system.
In the present embodiment, whether the monitoring control module can also be in lasting supervisory control system temperature and detection system variations in temperature greater than predetermined threshold value; To read the temperature value that temperature collect module is gathered if then monitor control module greater than threshold value, the temperature value that reads is sent to PC, PC is searched and current system temperature T in temperature compensation table according to the current system temperature that receives
NCorresponding numeric field power P
N, PC is again according to formula G
N=G+ (P
N-P) calculate the new gain G of digital temperature compensating module
NBe sent to the monitoring control module then, monitoring control module sending controling instruction is to the digital temperature compensating module, and the gain G of digital temperature compensating module is updated to new gain G
NAnd storage temperature T
NWherein, the gain of the digital temperature compensating module that once upgrades before G represents, P is illustrated in numeric field power corresponding with the preceding system temperature of once preserving in the temperature compensation table.Like this, according to variation of temperature, constantly the offset of the digital temperature compensating module of Adjustment System reaches the better effect of power precision control.
Above-described embodiment of the present invention does not constitute the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (4)
1. the method for temperature-compensating in the digital pre-distortion system is characterized in that, comprising:
Step S1 after feedback radio frequency link and temperature collect module are placed in the high-low temperature chamber, receives range of temperature and rate temperature change curve that user instruction arranges high-low temperature chamber;
Step S2, the gain that the digital temperature compensating module is set is fixed value, and the coupled power size equals to feed back the signal of coupled power to based on feedback link when system is maximum to be exported;
Step S3, the temperature value of when variations in temperature, gathering the numeric field power of described based on feedback link and the described feedback radio frequency link line item of going forward side by side; Match as a result obtains corresponding curve according to record, and obtains temperature compensation table according to this correspondence curve calculation;
Step S4, the output gain of the radio frequency link gain of adjustment forward direction and digital pre-distortion module;
Step S5 adjusts the gain of described feedback radio frequency link gain and described digital temperature compensating module; The gain that current digital temperature compensation module is set then is G
1, read the starter system temperature T of collection
1And according to T
1Search corresponding numeric field power P in described temperature compensation table
1
Step S6, operation digital pre-distortion algorithm is also gathered the system temperature T that changes
2, as system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, search and T in described temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of described digital temperature compensating module
2, the gain of described digital temperature compensating module is updated to G
2And storage temperature T
2
2. according to the method for temperature-compensating in the described digital pre-distortion system of claim 1, it is characterized in that the process that match as a result obtains corresponding curve according to record among the step S3 specifically comprises: adopt the fitting of a polynomial algorithm to carry out match according to the record result and obtain corresponding curve.
3. according to the method for temperature-compensating in claim 1 or the 2 described digital pre-distortion systems, it is characterized in that, after step S6, also comprise step:
Whether continue supervisory control system temperature and detection system variations in temperature greater than predetermined threshold value; If then search and current system temperature T in described temperature compensation table greater than threshold value
NCorresponding numeric field power P
N, according to formula G
N=G+ (P
N-P) calculate the new gain G of described digital temperature compensating module
N, the gain G of described digital temperature compensating module is updated to new gain G
NAnd storage temperature T
NWherein, the gain of the digital temperature compensating module that once upgrades before G represents, P represents numeric field power corresponding with the preceding system temperature of once preserving in the described temperature compensation table.
4. digital pre-distortion system, this digital pre-distortion system respectively be used for high-low temperature chamber that analog temperature changes, be used for carrying out the PC that data handle and link to each other, it is characterized in that,
Described digital pre-distortion system comprises forward link, based on feedback link, is used for the digital pre-distortion module of digital pre-distortion algorithm power control, is used for gathering the temperature collect module of feedback radio frequency link temperature data and the monitoring control module that is used for each module is carried out condition monitoring, control and data read; Described forward link comprises for baseband signal being carried out filtering, modulation and amplifying the forward direction radio frequency link of handling; Described based on feedback link comprises for described feedback radio frequency link change in gain being realized the digital temperature compensating module of numeric field fine compensation and being used for feedback signal is carried out the described feedback radio frequency link that filtering, mixing and amplification are handled;
After described feedback radio frequency link and described temperature collect module were placed on the high-low temperature chamber the inside, described high-low temperature chamber received user instruction range of temperature and rate temperature change curve is set;
The gain that described monitoring control module arranges the digital temperature compensating module is fixed value, and the signal of feedback coupled power is to based on feedback link when equaling the maximum output of system by described forward link coupled power size then;
When variations in temperature, described digital pre-distortion module is gathered the numeric field power of described based on feedback link, described temperature collect module is gathered the temperature value of described feedback radio frequency link, and described monitoring control module reads described numeric field power and described temperature value and is sent to PC; Described PC records described numeric field power and described temperature value, and match as a result obtains corresponding curve according to record again, and obtains temperature compensation table according to this correspondence curve calculation;
Described monitoring control module is adjusted the output gain of the gain of forward direction radio frequency link and digital pre-distortion module earlier, adjusts the gain of described feedback radio frequency link gain and described digital temperature compensating module again; The gain of current digital temperature compensation module is set is default value G to described monitoring control module then
1, read the starter system temperature T that described temperature collect module is gathered
1And with the T that reads
1Be sent to described PC; Described PC is according to T
1Search corresponding numeric field power P in described temperature compensation table
1
Described digital pre-distortion module operation digital pre-distortion algorithm, the system temperature T that described temperature collect module collection changes
2As system temperature change Delta T=T
2-T
1During greater than predetermined threshold value, described monitoring control module reads T
2And with T
2Be sent to described PC; Described PC is searched and T in described temperature compensation table
2Corresponding numeric field power P
2, according to formula G
2=G
1+ (P
2-P
1) calculate the new gain G of described digital temperature compensating module
2, and with new gain G
2Be sent to described monitoring control module; Described monitoring control module is updated to G with the gain of described digital temperature compensating module
2And storage temperature T
2
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010183247 CN101873284B (en) | 2010-05-19 | 2010-05-19 | Digital predistortion system and temperature compensation method in digital predistortion system |
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| CN101873284A CN101873284A (en) | 2010-10-27 |
| CN101873284B true CN101873284B (en) | 2013-10-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026349B (en) * | 2010-12-09 | 2014-08-13 | 中兴通讯股份有限公司 | Control method and device for transmitting power |
| CN103428133B (en) * | 2012-05-24 | 2016-09-07 | 富士通株式会社 | The temperature compensation means of predistortion, method, predistorter and emitter |
| CN103634890B (en) * | 2012-08-20 | 2017-03-08 | 京信通信***（中国）有限公司 | DPD power amplifier product power calibration method and apparatus |
| CN103840863B (en) * | 2012-11-23 | 2017-04-05 | 京信通信***（中国）有限公司 | Auto gain control method with temperature-compensating and device, digital communication system |
| CN103066925B (en) * | 2012-12-04 | 2015-10-28 | 江苏指南针导航通信技术有限公司 | Low noise power-magnifying method, amplifying device and satellite navigation receiving equipment |
| CN104601119A (en) * | 2013-10-30 | 2015-05-06 | 西安空间无线电技术研究所 | Open loop characterized temperature-dependent phase tracking and compensating amplifier |
| CN107276647B (en) * | 2017-07-07 | 2023-10-10 | 京信网络***股份有限公司 | Loop gain control system and method |
| CN109462382B (en) * | 2018-10-26 | 2022-07-29 | 京信网络***股份有限公司 | Power amplification system, power measurement and control method, device and base station equipment |
| CN110972342B (en) * | 2019-11-13 | 2022-03-15 | 九阳股份有限公司 | Sensor high-temperature alarm threshold compensation method and electromagnetic heating equipment |
| CN112867042B (en) * | 2020-12-31 | 2023-05-16 | 京信网络***股份有限公司 | Gain control method, device, base station and storage medium |
| CN113014207B (en) * | 2021-03-03 | 2023-07-18 | 展讯通信（上海）有限公司 | Radio frequency circuit, predistortion compensation method and device thereof and electronic equipment |
| US11356133B1 (en) * | 2021-04-30 | 2022-06-07 | Hewlett Packard Enterprise Development Lp | Methods and systems for filter frequency response shift compensation for WLAN traffic |
| CN113285727B (en) * | 2021-06-02 | 2022-07-22 | 恒玄科技(北京)有限公司 | Wireless signal transmitting device and processing method thereof |
| CN117040450B (en) * | 2023-07-17 | 2024-05-10 | 北京力通通信有限公司 | Piecewise linear digital predistortion system and method for temperature compensation of power amplifier |
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| JP2003304121A (en) * | 2002-04-08 | 2003-10-24 | Hitachi Kokusai Electric Inc | Adaptive predestination system amplifier |
| US7034612B2 (en) * | 2002-07-20 | 2006-04-25 | Lg Electronics Inc. | Apparatus and method for compensating pre-distortion of a power amplifier |
| US20040052536A1 (en) * | 2002-09-17 | 2004-03-18 | General Instrument Corporation | Second order predistortion circuit |
| CN1925348B (en) * | 2006-10-10 | 2010-04-21 | 华为技术有限公司 | Standing-wave ratio detecting method and device |
| CN101520666B (en) * | 2009-04-10 | 2010-11-10 | 北京北方烽火科技有限公司 | Wideband digital predistortion power amplifier temperature compensation method and system |
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