CN102412791A - Digital pre-distortion processing method for high-efficiency power amplifier - Google Patents
Digital pre-distortion processing method for high-efficiency power amplifier Download PDFInfo
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- CN102412791A CN102412791A CN2011103860701A CN201110386070A CN102412791A CN 102412791 A CN102412791 A CN 102412791A CN 2011103860701 A CN2011103860701 A CN 2011103860701A CN 201110386070 A CN201110386070 A CN 201110386070A CN 102412791 A CN102412791 A CN 102412791A
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Abstract
The invention discloses a digital pre-distortion processing method for a high-efficiency power amplifier, which is characterized in that a digital filter unit 3 is additionally arranged between a signal synchronization unit 2 and a digital pre-distortion training unit 4. The specific implementation scheme is as follows: an output signal of a digital pre-distorter and a feedback signal of the power amplifier are subjected to signal synchronization firstly, then two paths of synchronized signals are transmitted to a digital pre-distortion trainer, two paths of data are filtered, and finally filtered data is input to the digital pre-distortion trainer to be used for training pre-distortion model parameters. Signals subjected to digital filtration effectively overcomes the jittering problem of the input signal, thus output linearity of the power amplifier is increased. The digital pre-distortion processing method is simple in realizing and easy to operate.
Description
Technical field
The present invention relates to a kind of digital pre-distortion treatment technology that is used for high efficiency power amplifier, relate to the data filtering method of digital pre-distortion system particularly.
Background technology
Along with the fast development of Modern wireless communication technology, power amplifier is as influencing the most important device of communication system performance, and its nonlinear characteristic and memory effect more and more receive the concern of industry.
The non-linear of power amplifier be meant when the amplitude of amplifier input signal progressively increases, the output signal state that will reach capacity, and input and output are rendered as non-linear relation, comprise amplitude non-linearity, phase nonlinear and crosstalk.The adverse consequences of non-linear generation mainly shows: (1) inband signaling distortion, increased the error rate of receiving system, and have a strong impact on the signal transmission; (2) out of band spectrum is regenerated or expansion, influences adjacent channel user's normal transmission, produces adjacent channel and disturbs.
The memory effect of power amplifier in narrow-band communication system a little less than, often be left in the basket.But in wide-band communication system, it becomes very significantly, has a strong impact on the quality of communication system.The broadband is defined as the bandwidth of transmission signals and the bandwidth of device itself and has comparativity.Therefore, memory effect and bandwidth are closely related.Memory effect sees from the time domain angle, and the output signal that is meant the amplifier current time had both depended on the input signal of current time, and was also relevant with past input signal constantly; See from the angle of frequency domain, be meant the amplitude of amplifier and the phenomenon that phase characteristic changes along with the variation of input signal envelope frequency.
In order to improve the efficient of power amplifier, generally let it be operated near the saturation point place.Yet the adverse consequences that the characteristic of power amplifier causes greatly reduces its efficient.Improve efficiency power amplifier, its linearization technique is very crucial.Linearization technique can be divided into back-off method (Back-off), negative feedback method (Feedback), feed forward approach (Feed-forward), nonlinear device method (LINC), pre-distortion method (Pre-distortion) etc. usually.
Pre-distortion technology develops into digital pre-distortion from analog predistortion in the Digital Signal Processing development, owing to digital pre-distortion technology is more convenient for adopting adaptive structure, is realized developing rapidly than complicated algorithm than analog predistortion technology.The application of digital pre-distortion disturbs (ACLR:Adjacent Channel Leakage Ratio), range error vector (EVM:Error vector magnitude) to have very significant effect to the adjacent channel of improving power amplifier.
Usually, the digital pre-distortion system before the power amplifier mainly comprises digital predistorter, signal synchronization unit and digital pre-distortion training aids three parts.The model parameter of digital predistorter is in the digital pre-distortion training aids, to train; Being the digital pre-distortion training aids obtains new parameter through the power amplifier output feedback signal after the time synchronized and digital pre-distortion output signal are done self-adaptive processing, and is delivered to digital predistorter and carries out the predistortion model parameter and upgrade.Be the digital pre-distortion training aids to be done directly to send into the digital pre-distortion training aids after the time synchronized to power amplifier output feedback signal and digital predistorter output signal carry out the self adaptation computing in the conventional method, obtain the predistortion model parameter.The drawback of this method has been to ignore the influence of the jitter of two-way input signal to the power amplifier output linearity.A kind of digital pre-distortion processing method that is used for high efficiency power amplifier of the present invention proposes solution to above problem, adopts data filter to handle, and can optimize the performance of digital predistorter, improves the linearity of power amplifier.
Summary of the invention
Jitter problem for the input that reduces pre-distortion system; The present invention proposes a kind of high efficiency power amplifier digital pre-distortion processing method that is used for; It is characterized in that after the feedback signal of the output signal of digital predistorter and power amplifier output is made time synchronized; Advanced line data filtration treatment, and then the signal after two-way filtered is sent to the training of carrying out pre-distortion parameters in the digital pre-distortion training.Data filter processing method to the feedback signal of the output signal of the digital predistorter after synchronously and power amplifier output is:
1, thresholding maximum and minimum value are set, the two is nonnegative real number;
2, calculate the mould value of back power amplifier feedback signal synchronously;
3, whether the mould value of judging the power amplifier feedback signal satisfies the threshold value condition that is provided with: if the mould value greater than maximum or less than minimum value, then loses these data, remove synchronously simultaneously after the data-signal exported of the digital predistorter in this moment; If the mould value is smaller or equal to maximum or more than or equal to minimum value, the power amplifier feedback data signal that this will this moment after synchronous and the digital pre-distortion outputting data signals all pass to the digital pre-distortion training aids.
Beneficial effect of the present invention
A kind of high efficiency power amplifier digital pre-distortion processing method that is used for of the present invention; The method of employing data filter is carried out filtration treatment to the signal of input digit predistortion training aids in digital pre-distortion technology, has overcome the jitter of input signal, makes the predistortion model parameter that obtains more stable; Improve the output linearity of power amplifier; And be easy in DSP, accomplish, realize simple, applied widely.
Description of drawings
Fig. 1 is the data filtering method flow chart that the present invention is used for the high efficiency power amplifier digital pre-distortion.
Fig. 2 is a kind of structure diagram that is used for high efficiency power amplifier digital pre-distortion processing method of the present invention
Embodiment
The present invention has announced a kind of high efficiency power amplifier digital pre-distortion processing method that is used for, and is applicable to digital pre-distortion technology neutral line power amplifier, describes in detail with reference to the accompanying drawings.
Fig. 2 is a kind of embodiment that is used for the digital pre-distortion processing method structure representation of high efficiency power amplifier of the present invention; Comprise digital pre-distortion unit (1), signal synchronization unit (2) and digital pre-distortion training unit (4); There are an external signal input, a model parameter signal input part and an output in digital pre-distortion unit (1); Outside amplifying signal output after signal synchronization unit (2) has an outside amplifying signal input and pre-distorted signals input and one synchronously and one the pre-distorted signals output after synchronously; Digital pre-distortion training unit (4) has two inputs and an output; Wherein the signal of the external input terminals of digital pre-distortion unit (1) is exactly the external input signal that this pre-distortion method will be handled; The output of digital pre-distortion unit (1) is divided into two-way; One the tunnel as the output signal after the digital pre-distortion processing; Another road is input to the pre-distorted signals input of signal synchronization unit (2), and the outside amplifying signal input of signal synchronization unit (2) then is the feedback signal that derives from the power amplifier outside the digital pre-distortion processing, and the signal of the output of digital pre-distortion training unit (4) outputs to the model parameter input of digital pre-distortion unit (1); It is characterized in that between signal synchronization unit (2) and digital pre-distortion training unit (4), having increased data filtering units (3); Data filtering units (3) has the external signal output after pre-distorted signals input and after the synchronously pre-distorted signals output after the outside amplifying signal input in back and the filtration treatment and the filtration synchronously; Two inputs of digital pre-distortion training unit (4) are respectively outside amplifying signal input and the pre-distorted signals ends after the filtration treatment after the filtration treatment; Two of signal synchronization unit (2) output signals respectively with the corresponding connection of two input signals of data filtering units (3); The signal of two outputs of data filtering units (3) is input to two inputs of digital pre-distortion training unit (4) respectively accordingly; After promptly the feedback signal after the output signal to digital predistorter amplifies with the outside is carried out time synchronized and before the pre-distortion parameters training; Advanced line data filtration treatment, and then the signal after two-way filtered is sent to digital pre-distortion training unit (4) lining and carries out the training of pre-distortion parameters.
So-called outside is pre-distortion system during as disposed of in its entirety unit of this method, part that this is in addition whole.
Fig. 1 has provided the data filtering method flow chart that the present invention is used for the high efficiency power amplifier digital pre-distortion, can in high-speed dsp, accomplish.Give detailed elaboration below in conjunction with Fig. 2.Concrete steps are following:
1, signal synchronization unit 2 is obtained the output signal of digital pre-distortion unit 1 and the feedback signal of power amplifier; Two paths of signals is carried out Synchronous Processing in time; Digital predistorter output signal sequence X and power amplifier feedback signal sequence Y after obtaining synchronously; Pass to data filtering units 3 again, two paths of signals is complex signal;
2, data filtering units 3 is carried out data filter with the two paths of signals after synchronous according to data filtering method, and concrete data filtering method is provided by Fig. 2:
(1) thresholding maximum and minimum value are set, the two is nonnegative real number, in the present embodiment structure, establishes maximum MAX=0.5, minimum value MIN=0.0001;
(2) calculate the mould value of back power amplifier feedback signal synchronously;
Whether the mould value of (3) judging the power amplifier feedback signal satisfies the threshold value condition that is provided with: if the mould value is greater than maximum 0.5 or less than minimum value 0.0001; Then do not satisfy condition; These data are omitted, removed synchronous back digital pre-distortion output signal data of corresponding positions simultaneously; If the mould value is smaller or equal to maximum 0.5 or more than or equal to minimum value 0.0001; Then satisfy condition, this power amplifier feedback signal value is all passed to digital pre-distortion training aids unit 4 with corresponding synchronous digital pre-distortion output signal value be used to train the predistortion model parameter;
In the said step 1, confirming of thresholding max min can be decided according to situation in the instantiation, also can carry out obtaining after the statistical analysis according to simulation result.
Claims (3)
1. digital pre-distortion processing method that is used for high efficiency power amplifier; Comprise digital pre-distortion unit (1), signal synchronization unit (2) and digital pre-distortion training unit (4); There are an external signal input, a model parameter signal input part and an output in digital pre-distortion unit (1); Outside amplifying signal output after signal synchronization unit (2) has an outside amplifying signal input and pre-distorted signals input and one synchronously and one the pre-distorted signals output after synchronously; Digital pre-distortion training unit (4) has two inputs and an output; Wherein the signal of the external input terminals of digital pre-distortion unit (1) is exactly the external input signal that this pre-distortion method will be handled; The output of digital pre-distortion unit (1) is divided into two-way; One the tunnel as the output signal after the digital pre-distortion processing; Another road is input to the pre-distorted signals input of signal synchronization unit (2), and the outside amplifying signal input of signal synchronization unit (2) then is the feedback signal that derives from the power amplifier outside the digital pre-distortion processing, and the signal of the output of digital pre-distortion training unit (4) outputs to the model parameter input of digital pre-distortion unit (1); It is characterized in that between signal synchronization unit (2) and digital pre-distortion training unit (4), having increased data filtering units (3); Data filtering units (3) has the external signal output after pre-distorted signals input and after the synchronously pre-distorted signals output after the outside amplifying signal input in back and the filtration treatment and the filtration synchronously; Two inputs of digital pre-distortion training unit (4) are respectively outside amplifying signal input and the pre-distorted signals ends after the filtration treatment after the filtration treatment; Two of signal synchronization unit (2) output signals respectively with the corresponding connection of two input signals of data filtering units (3); The signal of two outputs of data filtering units (3) is input to two inputs of digital pre-distortion training unit (4) respectively accordingly; After promptly the feedback signal after the output signal to digital predistorter amplifies with the outside is carried out time synchronized and before the pre-distortion parameters training; Advanced line data filtration treatment, and then the signal after two-way filtered is sent to digital pre-distortion training unit (4) lining and carries out the training of pre-distortion parameters; The data filter processing procedure is:
Step 1: thresholding maximum and minimum value are set, and the two is nonnegative real number;
Step 2: calculate the mould value of back power amplifier feedback signal synchronously;
Step 3: whether the mould value of judging the power amplifier feedback signal satisfies the threshold value condition that is provided with: if the mould value greater than maximum or less than minimum value, then loses these data, remove synchronously simultaneously after the data-signal exported of the digital predistorter in this moment; If the mould value is smaller or equal to maximum or more than or equal to minimum value, the power amplifier feedback data signal that this will this moment after synchronous and the digital pre-distortion outputting data signals all pass to digital pre-distortion training aids unit (4).
2. according to the said a kind of high efficiency power amplifier digital pre-distortion processing method that is used for of claim 1, maximum in the step 2 in the data filtering method and minimum value carry out obtaining after the statistical analysis according to simulation result.
3. according to the said a kind of high efficiency power amplifier digital pre-distortion processing method that is used for of claim 1, signal synchronization unit, data filtering units and digital pre-distortion training aids are accomplished by high-speed dsp.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106537862A (en) * | 2014-04-30 | 2017-03-22 | 华为技术有限公司 | Pre-distortion system and method |
| WO2021115127A1 (en) * | 2019-12-09 | 2021-06-17 | 深圳市中兴微电子技术有限公司 | Data acquisition method, apparatus and device, and storage medium |
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| CN102143108A (en) * | 2011-03-17 | 2011-08-03 | 电子科技大学 | Improved self-adaption predistortion technology |
| US8018278B2 (en) * | 2009-09-17 | 2011-09-13 | Electronics And Telecommunications Research Institute | Pre-distortion apparatus of power amplifier and method thereof |
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| CN1870614A (en) * | 2005-05-27 | 2006-11-29 | 华为技术有限公司 | Universal device for predistortion processing base band digital signal |
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| US8018278B2 (en) * | 2009-09-17 | 2011-09-13 | Electronics And Telecommunications Research Institute | Pre-distortion apparatus of power amplifier and method thereof |
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| WO2021115127A1 (en) * | 2019-12-09 | 2021-06-17 | 深圳市中兴微电子技术有限公司 | Data acquisition method, apparatus and device, and storage medium |
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Application publication date: 20120411 |