CN103780523A - Processing method of digital predistortion data and device thereof - Google Patents
Processing method of digital predistortion data and device thereof Download PDFInfo
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Abstract
The invention discloses a processing method of digital predistortion data and a device thereof. The method comprises the steps of carrying out data rotating training on different channels of different power levels by an FPGA three-order intermodulation spectrum detection module, carrying out pre-acquisition of forward data and feedback data to carry out peak screening when date power and priority reach the maximum, carrying out three-order intermodulation spectrum component detection on the screened feedback data, judging the fitting degree of digital pre-distortion and power amplifier nonlinearity, aligning the screened forward data and the feedback data and sending the data to a DSP solution module to carry out error vector solution when a condition that the fitting degree is poor is determined, and a step of collecting the current forward data and feedback data to carry out preprocessing and then to carry out DPD solution when the condition that an error vector is high. Through two rounds of effectiveness calculation of the three-order intermodulation spectrum component detection and the error vector solution, the condition that the process of data collection happens at a time when a new round of DPD solution is needed is ensured, and the collected data can reflect the overall data characteristic of the current time.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and device of processing of digital pre-distortion data.
Background technology
In 3G/4G base station along with the lifting of signal power, the non-linear phenomena of base station power amplification shows clearly, the linear index of power amplifier is brought to very large challenge, in order to slow down the pressure to hardware power amplifier, digital pre-distortion (Digital Pre-Distortion, DPD) algorithm arises, before entering power amplifier, at numeric field, primary signal is carried out to predistortion operation, the processing method of DPD as shown in Figure 1.Along with the evolution of 3G/4G technology, carrying out predistortion operation in digital intermediate frequency/base band is trend of the times.Carry out predistortion in intermediate frequency/base band and have a lot of technology: multinomial distortion, look-up table etc., this is the classification in forward direction application to pre-distortion coefficients, classifies: have feedback iteration DPD structure, forward iteration DPD destructing from the use to data.No matter which kind of classification, which kind of destructing, before all relating to, feedback data gather problem, because if it is effective that these two groups of data cannot gather and screen, gather the data of returning and can not represent overall data characteristic or the power amplifier characteristic in nearest one period of moment, the power amplifier that resolves out so just/inverse model also will be very inaccurate.But existing digital pre-distortion resolve collection before, the accuracy of feedback data need further raising.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide a kind of method and device of processing of digital pre-distortion data, in order to further raising digital pre-distortion resolve collection before, the accuracy of feedback data.
Object of the present invention is mainly achieved through the following technical solutions:
The invention provides a kind of processing unit of digital pre-distortion data, this device comprises:
FPGA third order intermodulation frequency spectrum detection module, for the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, described forward data and described feedback data to pre-collection are carried out peak value screening, the feedback data screening is carried out to the detection of third order intermodulation spectrum component, judge the nonlinear fitting degree of digital pre-distortion and power amplifier, in the time that definite fitting degree is poor, by screening after forward data and reverse data in frequency, on time domain and complex gain, after alignment, send to DSP to resolve module,
Described DSP resolves module, and carry out error vector and resolve for the forward data to after alignment and reverse data, in the time that definite error vector is high, triggering DPD pretreatment module;
Described DPD pretreatment module, for gathering current forward data and feedback data and the above-mentioned data that collect being carried out to carry out DPD after preliminary treatment again and resolve.
Preferably, described FPGA third order intermodulation frequency spectrum detection module specifically for, the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, and described forward data and described feedback data to pre-collection carried out peak value screening, then the feedback data screening is carried out to frequency sweep, get the frequency of predetermined number, the frequency of getting is mixed to dc point successively, and respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is added up, compare with predetermined threshold value, if exceed predetermined threshold value, trigger described DSP and resolve module.
Wherein, described predetermined threshold value is 40-60db.
Preferably, described DSP resolve module specifically for, receive forward data and reverse data after alignment, and above-mentioned two kinds of data are carried out to error vector and resolve, when the error vector of resolving is out during higher than 4-5, trigger described DPD pretreatment module.
Preferably, described DPD pretreatment module specifically for, current forward data and the feedback data of synchronous acquisition predetermined quantity; Current feedback data is carried out to frequency conversion, speed change, and current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum; Then carry out accurate decimal time delay alignment; By the N before being inserted in current forward data times, and get the wherein point of some; Relative sliding before and after correlation peak location, finds the maximum point of relevant peaks, and current forward data is slided into this position; Again current forward data is carried out to Accurate align with current feedback data on high rate; Then current forward data is carried out to N and doubly extract, convert back original signal rate, then carry out DPD and resolve.
The present invention also provides a kind of processing method of digital pre-distortion data, the method is applied a kind of processing unit of digital pre-distortion data, described device comprises: FPGA third order intermodulation frequency spectrum detection module, DSP resolve module and DPD pretreatment module, and the method comprises:
Described FPGA third order intermodulation frequency spectrum detection module is carried out training in rotation to the data of different capacity grade and different passages, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, and forward data and feedback data to pre-collection carried out peak value screening, again the feedback data screening is carried out to the detection of third order intermodulation spectrum component, judge the nonlinear fitting degree of digital pre-distortion and power amplifier, in the time that definite fitting degree is poor, by the forward data screening and feedback data in frequency, after the enterprising row alignment of time domain and complex gain, send to described DSP to resolve module, described DSP resolves forward data and the feedback data of module after to alignment to carry out error vector and resolves, in the time that definite error vector is high, described DPD pretreatment module gathers current forward data and feedback data, and the above-mentioned data that collect are carried out to carry out DPD after preliminary treatment again and resolve.
Preferably, described FPGA third order intermodulation frequency spectrum detection module is carried out the detection of third order intermodulation spectrum component to the feedback data after screening, and judges that the step of digital pre-distortion and the nonlinear fitting degree of power amplifier specifically comprises:
Described FPGA third order intermodulation frequency spectrum detection module is carried out frequency sweep to the feedback data screening, get the frequency of predetermined number, and the frequency of getting is mixed to dc point successively, then respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is all cumulative, compare with predetermined threshold value, if exceed predetermined threshold value, determine that the nonlinear fitting degree of digital pre-distortion and power amplifier is poor.
Wherein, described predetermined threshold value is 40-60db.
Preferably, described DSP resolves the forward data of module after to alignment and feedback data and carries out the step that error vector resolves and specifically comprise:
Described DSP resolves module and receives forward data and the feedback data after alignment, and above-mentioned two kinds of data is carried out to error vector and resolve, and when the error vector of resolving is out during higher than 4-5, determines that error vector is high.
Preferably, described DPD pretreatment module gathers current forward data and feedback data, and the above-mentioned data that collect are carried out to pretreated step specifically comprises:
Current forward data and the feedback data of described DPD pretreatment module synchronous acquisition predetermined quantity;
Current feedback data is carried out to frequency conversion, speed change;
Then current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum;
Carry out again accurate decimal time delay alignment;
By the N before being inserted in current forward data times, and get the wherein point of some;
At correlation peak location front and back relative sliding, find the maximum point of relevant peaks, current forward data is slided into this position;
Current forward data is carried out to Accurate align with described feedback data on high rate;
Current forward data is carried out to N and doubly extract, convert back original signal rate.
Beneficial effect of the present invention is as follows:
The invention provides a kind of processing method of digital pre-distortion data, the method detects by third order intermodulation spectrum component and error vector is resolved the calculating of two-wheeled validity, the process of guaranteeing image data occurs in need to carry out the moment that the DPD of a new round resolves, rather than also work in good and go the DPD that carries out a new round to resolve in old pre-distortion coefficients, make the data that gather more can reflect the data characteristic of current time entirety.
Other features and advantages of the present invention will be set forth in the following description, and, part from specification, become apparent, or by implement the present invention understand.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in write specification, claims and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the method block diagram that the DPD of prior art processes;
The flow chart of the method that the DPD of Fig. 2 embodiment of the present invention 1 processes;
Fig. 3 is the DPD processing unit schematic diagram of the embodiment of the present invention 1;
Fig. 4 is the flow chart of the method for the DPD processing of the embodiment of the present invention 2;
Fig. 5 is the DPD processing unit schematic diagram of the embodiment of the present invention 3.
Embodiment
Specifically describe the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing forms the application's part, and together with embodiments of the present invention for explaining principle of the present invention.
The embodiment of the present invention comprises programmable gate array (Field-Programmable Gate Array, be called for short FPGA), digital pre-distortion (Digital Pre-Distortion, be called for short DPD) and Digital Signal Processing (Digital Signal Processing is called for short DSP).
Embodiment 1
The embodiment of the present invention provides a kind of processing method of digital pre-distortion data, referring to Fig. 2, the embodiment of the present invention is to increase FPGA third order intermodulation frequency spectrum detection module in the middle of the feedback ADC of the existing overall loop DPD frame diagram shown in Fig. 1 and mixing, filtering, extraction processing, and between complex gain adjustment and DPD calculating engine, increase DSP and resolve module, specifically as shown in Figure 3.
The processing method of the digital pre-distortion data of the embodiment of the present invention comprises:
S101, FPGA third order intermodulation frequency spectrum detection module are carried out training in rotation to the data of different capacity grade and different passages, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, forward data to pre-collection and feedback data are carried out peak value screening, and the feedback data screening is carried out to the detection of third order intermodulation spectrum component;
S102, FPGA third order intermodulation frequency spectrum detection module judge digital pre-distortion and the nonlinear fitting degree of power amplifier, if fitting degree is poor, enter S103;
S103, after the enterprising row alignment of frequency, time domain and complex gain, send to described DSP to resolve module the forward data screening and feedback data;
What this step adopted is that prior art is processed the forward data screening and feedback data, and the present invention no longer reviews this processing method at this.
S104, DSP resolve forward data and the feedback data of module after to alignment to carry out error vector and resolves;
Whether S105, DSP resolve module error in judgement vector high, in the time that error vector is high, enter S106;
S106, DPD pretreatment module gather current forward data and feedback data, and the above-mentioned data that collect are carried out to preliminary treatment;
S107, pretreated data are carried out to DPD resolve.
The embodiment of the present invention provides a kind of processing method of digital pre-distortion data, the method detects by third order intermodulation spectrum component and error vector is resolved the calculating of two-wheeled validity, the process of guaranteeing image data occurs in need to carry out the moment that the DPD of a new round resolves, rather than also work in good and go the DPD that carries out a new round to resolve in old pre-distortion coefficients, make the data that gather more can reflect the data characteristic of current time entirety.
The embodiment of the present invention provides a kind of processing method of digital pre-distortion data, and referring to Fig. 4, the method comprises:
Baseband signal disappears after peak and HB2 reduction of speed through CRF, enter forward direction DPD and carry out predistortion processing, become analog signal by DAC analog-to-digital conversion device again, analog signal is amplified through small-signal link, and then through coupler, fraction power amplifier nonlinear properties are fetched to feedback modulus transducer ADC, then carry out following treatment step, specifically as shown in Figures 3 and 4.
S201, FPGA third order intermodulation frequency spectrum detection module are carried out training in rotation to the data of different capacity grade and different passages, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, forward data to pre-collection and feedback data are carried out peak value screening, the feedback data screening is carried out to frequency sweep, get the frequency of predetermined number, the frequency of getting is mixed to dc point successively, and respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is all added up;
Wherein, the described predetermined threshold value of the embodiment of the present invention is 40-60db, and certain those skilled in the art also can carry out other to predetermined threshold value according to actual needs and set arbitrarily.
Whether the power of all dc points that S202, the judgement of FPGA third order intermodulation frequency spectrum detection module add up exceedes predetermined threshold value, in the time exceeding predetermined threshold value, enters S203;
S203, after the enterprising row alignment of frequency, time domain and complex gain, send to described DSP to resolve module the forward data screening and feedback data;
What this step adopted is that prior art is processed the forward data screening and feedback data, and the present invention no longer reviews this processing method at this.
S204, DSP resolve module and receive forward data and the feedback data after alignment, and above-mentioned two kinds of data are carried out to error vector and resolve;
The error vector that S205, judgement resolve out, whether higher than 4-5, when error vector is higher than 4-5, enters S206;
The error vector that the embodiment of the present invention is resolved out during higher than 4-5, determines that error vector is high, and those skilled in the art also can carry out according to actual needs other and set arbitrarily.
Current forward data and the feedback data of S206, described DPD pretreatment module synchronous acquisition predetermined quantity; Current feedback data is carried out to frequency conversion, speed change; Then current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum; Carry out again accurate decimal time delay alignment; By the N before being inserted in current forward data times, and get the wherein point of some; At correlation peak location front and back relative sliding, find the maximum point of relevant peaks, current forward data is slided into this position; Current forward data is carried out to Accurate align with described feedback data on high rate; Current forward data is carried out to N and doubly extract, convert back original signal rate;
S207, pretreated data are carried out to DPD resolve.
The embodiment of the present invention provides a kind of processing method of digital pre-distortion data, by the calculating that third order intermodulation spectrum component detects and error vector is resolved two-wheeled, the process of guaranteeing image data occurs in need to carry out the moment that the DPD of a new round resolves, rather than also work in good and go the DPD that carries out a new round to resolve in old pre-distortion coefficients, and the embodiment of the present invention is that forward data is carried out to interpolation and extraction, but not feedback data, the result that DPD is resolved is more accurate.
Embodiment 3
The embodiment of the present invention provides a kind of processing unit of digital pre-distortion data, and referring to Fig. 5, this device comprises:
FPGA third order intermodulation frequency spectrum detection module 51, for the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, described forward data and described feedback data to pre-collection are carried out peak value screening, and by screening after forward data and reverse data in frequency, on time domain and complex gain, after alignment, send to DSP to resolve module, the feedback data screening is carried out to the detection of third order intermodulation spectrum component, judge the nonlinear fitting degree of digital pre-distortion and power amplifier, in the time that definite fitting degree is poor, trigger DSP and resolve module,
DSP resolves module 52, and carry out error vector and resolve for the forward data to after alignment and reverse data, in the time that definite error vector is high, triggering DPD pretreatment module;
The processing unit of a kind of digital pre-distortion data that the embodiment of the present invention provides, by the calculating that third order intermodulation spectrum component detects and error vector is resolved two-wheeled, the process of guaranteeing image data occurs in need to carry out the moment that the DPD of a new round resolves, rather than also go the DPD that carries out a new round to resolve under old pre-distortion coefficients is also worked good prerequisite, and the data that gather more can reflect the data characteristic of current time entirety.
Embodiment 4
The embodiment of the present invention provides a kind of processing unit of digital pre-distortion data, and this device comprises:
FPGA third order intermodulation frequency spectrum detection module is used for, for the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, described forward data and described feedback data to pre-collection are carried out peak value screening, the feedback data screening is carried out to frequency sweep, get the frequency of predetermined number, the frequency of getting is mixed to dc point successively, and respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is added up, compare with predetermined threshold value, if exceed predetermined threshold value, trigger described DSP and resolve module, wherein, described predetermined threshold value is 40-60db,
DSP resolve module for, receive forward data and reverse data after alignment, and above-mentioned two kinds of data are carried out to error vector and resolve, when the error vector of resolving is out during higher than 4-5, trigger described DPD pretreatment module.
DPD pretreatment module is used for, current forward data and the feedback data of synchronous acquisition predetermined quantity; Current feedback data is carried out to frequency conversion, speed change, and current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum; Carry out accurate decimal time delay alignment; By the N before being inserted in current forward data times, and get the wherein point of some; At correlation peak location front and back relative sliding, find the maximum point of relevant peaks, current forward data is slided into this position; Current forward data is carried out to Accurate align with current feedback data on high rate; Current forward data is carried out to N and doubly extract, convert back original signal rate, triggering DPD calculating engine carries out DPD and resolves.
In sum, the embodiment of the present invention provides a kind of processing method and device of digital pre-distortion data, by the calculating that third order intermodulation spectrum component detects and error vector is resolved two-wheeled, the process of guaranteeing image data occurs in need to carry out the moment that the DPD of a new round resolves, rather than also work in good and go the DPD that carries out a new round to resolve in old pre-distortion coefficients, and the embodiment of the present invention is that forward data is carried out to interpolation and extraction, but not feedback data, the result that DPD is resolved is more accurate.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1. a processing unit for digital pre-distortion data, is characterized in that, comprising:
FPGA third order intermodulation frequency spectrum detection module, for the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, described forward data and described feedback data to pre-collection are carried out peak value screening, the feedback data screening is carried out to the detection of third order intermodulation spectrum component, judge the nonlinear fitting degree of digital pre-distortion and power amplifier, in the time that definite fitting degree is poor, by screening after forward data and reverse data in frequency, on time domain and complex gain, after alignment, send to DSP to resolve module,
Described DSP resolves module, and carry out error vector and resolve for the forward data to after alignment and reverse data, in the time that definite error vector is high, triggering DPD pretreatment module;
Described DPD pretreatment module, for gathering current forward data and feedback data and the above-mentioned data that collect being carried out to carry out DPD after preliminary treatment again and resolve.
2. device according to claim 1, is characterized in that,
Described FPGA third order intermodulation frequency spectrum detection module specifically for, the data of different capacity grade and different passages are carried out to training in rotation, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, and described forward data and described feedback data to pre-collection carried out peak value screening, then the feedback data screening is carried out to frequency sweep, get the frequency of predetermined number, the frequency of getting is mixed to dc point successively, and respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is added up, compare with predetermined threshold value, if exceed predetermined threshold value, trigger described DSP and resolve module.
3. device according to claim 2, is characterized in that, described predetermined threshold value is 40-60db.
4. device according to claim 1, is characterized in that,
Described DSP resolve module specifically for, receive forward data and reverse data after alignment, and above-mentioned two kinds of data are carried out to error vector and resolve, when the error vector of resolving is out during higher than 4-5, trigger described DPD pretreatment module.
5. according to the device described in claim 1-4 any one, it is characterized in that,
Described DPD pretreatment module specifically for, current forward data and the feedback data of synchronous acquisition predetermined quantity; Current feedback data is carried out to frequency conversion, speed change, and current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum; Then carry out accurate decimal time delay alignment; By the N before being inserted in current forward data times, and get the wherein point of some; Relative sliding before and after correlation peak location, finds the maximum point of relevant peaks, and current forward data is slided into this position; Again current forward data is carried out to Accurate align with current feedback data on high rate; Then current forward data is carried out to N and doubly extract, convert back original signal rate, then carry out DPD and resolve.
6. a processing method for digital pre-distortion data, is characterized in that, applies a kind of processing unit of digital pre-distortion data, and described device comprises: FPGA third order intermodulation frequency spectrum detection module, DSP resolve module and DPD pretreatment module, and the method comprises:
Described FPGA third order intermodulation frequency spectrum detection module is carried out training in rotation to the data of different capacity grade and different passages, in the time that the power of certain data and priority reach maximum, forward data and feedback data are gathered in advance, and forward data and feedback data to pre-collection carried out peak value screening, again the feedback data screening is carried out to the detection of third order intermodulation spectrum component, judge the nonlinear fitting degree of digital pre-distortion and power amplifier, in the time that definite fitting degree is poor, by the forward data screening and feedback data in frequency, after the enterprising row alignment of time domain and complex gain, send to described DSP to resolve module, described DSP resolves forward data and the feedback data of module after to alignment to carry out error vector and resolves, in the time that definite error vector is high, described DPD pretreatment module gathers current forward data and feedback data, and the above-mentioned data that collect are carried out to carry out DPD after preliminary treatment again and resolve.
7. method according to claim 6, it is characterized in that, described FPGA third order intermodulation frequency spectrum detection module is carried out the detection of third order intermodulation spectrum component to the feedback data after screening, and judges that the step of digital pre-distortion and the nonlinear fitting degree of power amplifier specifically comprises:
Described FPGA third order intermodulation frequency spectrum detection module is carried out frequency sweep to the feedback data screening, get the frequency of predetermined number, and the frequency of getting is mixed to dc point successively, then respectively the dc point after each mixing is carried out to integration summation and obtain its power, the power of all dc points is all cumulative, compare with predetermined threshold value, if exceed predetermined threshold value, determine that the nonlinear fitting degree of digital pre-distortion and power amplifier is poor.
8. method according to claim 7, is characterized in that, described predetermined threshold value is 40-60db.
9. method according to claim 6, is characterized in that, described DSP resolves the forward data of module after to alignment and feedback data to carry out the step that error vector resolves and specifically comprise:
Described DSP resolves module and receives forward data and the feedback data after alignment, and above-mentioned two kinds of data is carried out to error vector and resolve, and when the error vector of resolving is out during higher than 4-5, determines that error vector is high.
10. according to the method described in claim 6-9 any one, it is characterized in that, described DPD pretreatment module gathers current forward data and feedback data, and the above-mentioned data that collect are carried out to pretreated step specifically comprises:
Current forward data and the feedback data of described DPD pretreatment module synchronous acquisition predetermined quantity;
Current feedback data is carried out to frequency conversion, speed change;
Then current forward data and feedback data are slightly correlated with, obtain the location index of relevant peaks maximum;
Carry out again accurate decimal time delay alignment;
By the N before being inserted in current forward data times, and get the wherein point of some;
At correlation peak location front and back relative sliding, find the maximum point of relevant peaks, current forward data is slided into this position;
Current forward data is carried out to Accurate align with described feedback data on high rate;
Current forward data is carried out to N and doubly extract, convert back original signal rate.
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| CN201210409076.0A CN103780523B (en) | 2012-10-24 | 2012-10-24 | The method and device of the processing of digital pre-distortion data |
| JP2015537125A JP6218842B2 (en) | 2012-10-24 | 2013-09-13 | Digital predistortion data processing method and apparatus |
| PCT/CN2013/083513 WO2014063540A1 (en) | 2012-10-24 | 2013-09-13 | Method and device for processing digital pre-distortion data |
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| US7535298B2 (en) * | 2004-09-15 | 2009-05-19 | Telefonaktiebolaget L M Ericsson (Publ) | Arrangement and a method relating to signal predistortion |
| JP2012175401A (en) * | 2011-02-22 | 2012-09-10 | Nec Corp | Nonlinear compensation apparatus |
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| CN101562478A (en) * | 2009-05-25 | 2009-10-21 | 芯通科技（成都）有限公司 | Method for adaptively adjusting CFR threshold and radio frequency zooming system |
| US20110069749A1 (en) * | 2009-09-24 | 2011-03-24 | Qualcomm Incorporated | Nonlinear equalizer to correct for memory effects of a transmitter |
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| CN107294600A (en) * | 2017-06-15 | 2017-10-24 | 京信通信系统（中国）有限公司 | A kind of DPD loop detecting methods and equipment |
| CN107294600B (en) * | 2017-06-15 | 2019-07-16 | 京信通信系统（中国）有限公司 | A kind of DPD loop detecting method and equipment |
| CN107707495A (en) * | 2017-10-27 | 2018-02-16 | 京信通信系统（中国）有限公司 | The methods, devices and systems of multi-frequency-band digital pre-distortion |
| CN111432424A (en) * | 2019-01-10 | 2020-07-17 | 北京大学 | Cross-tone fine classification-based nonlinear distortion microscopic mechanism analysis method |
| CN113504513A (en) * | 2021-06-30 | 2021-10-15 | 电子科技大学 | Time domain nonlinear frequency modulation signal generation method |
| CN113504513B (en) * | 2021-06-30 | 2023-05-23 | 电子科技大学 | Time domain nonlinear frequency modulation signal generation method |
| CN113630361A (en) * | 2021-07-12 | 2021-11-09 | 深圳金信诺高新技术股份有限公司 | Peak value data acquisition method, data acquisition device and storage medium |
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| CN103780523B (en) | 2017-11-24 |
| JP6218842B2 (en) | 2017-10-25 |
| JP2016500221A (en) | 2016-01-07 |
| WO2014063540A1 (en) | 2014-05-01 |
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