CN113612454A - Power amplifier digital predistortion device and method based on affine function model with amplitude limiting selection - Google Patents
Power amplifier digital predistortion device and method based on affine function model with amplitude limiting selection Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a power amplifier digital predistortion device and a method based on an affine function model with amplitude limiting selection, wherein the power amplifier digital predistortion device comprises the following steps: the device comprises a digital predistorter, a digital-to-analog converter, an up-converter, a power amplifier, an attenuation coupler, a down-converter, a low-pass filter, an analog-to-digital converter and a digital predistortion model training module, wherein the digital predistorter is used for selecting an affine function model based on the band limiting degree. Compared with the prior art, the method greatly reduces the number of multipliers in the traditional band-limited model, reduces the memory resource consumption during the digital predistortion signal processing, has faster digital predistortion algorithm and can realize better predistortion effect.
Description
Technical Field
The invention relates to the technical field of digital predistortion, in particular to a power amplifier digital predistortion device and method based on an affine function model with amplitude limiting selection.
Background
With the development of wireless communication technology, higher requirements are put on communication rate, data capacity and the like, and in order to increase the data rate and network capacity of a fifth generation (5G) communication system, one of effective methods is to directly adopt a larger modulation bandwidth. As the signal bandwidth gets wider, the signal quality is further degraded by the non-linear characteristics and memory characteristics of the wideband power amplifier in the communication system.
The digital predistortion technology is one of the most common power amplifier linearization technologies due to the characteristics of high stability, strong flexibility and the like, and is widely applied to wireless communication systems. The large bandwidth puts higher requirements on the performances of the analog-digital converter, the digital-analog converter and the like in the digital predistortion system, and the communication cost and the hardware realization difficulty are greatly increased. In order to meet the requirement of ultra-large bandwidth communication, the processing of large bandwidth signals under limited bandwidth becomes a research hotspot of digital predistortion technology.
Aiming at the digital predistortion of a broadband Power amplifier, an A Band-Limited resonant Picture-Linear Function-Based channel Model for Wideband Power Amplifiers proposes a Band-Limited-normalized Piecewise Linear Function (BL-CPWL) Model, and compared with a Band-Limited SDDR (BL-SDDR) Model, the Model has the advantages of reducing the computation complexity and improving the flexibility, but a large amount of multiplication and addition operations still exist in the Model.
Disclosure of Invention
In view of the above, the present invention provides a power amplifier digital predistortion apparatus and method based on band-limited selection affine function model, so as to solve the technical problems mentioned in the background art and reduce the complexity of the existing band-limited power amplifier model.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power amplifier digital predistortion device based on an affine function model with amplitude limiting selection comprises: the digital predistorter selects an affine function model based on the clipping degree, and performs predistortion processing on an input digital baseband signal x (n) to generate a digital predistortion signal xpd(n); the number preDistorted signal xpd(n) sequentially passing through a digital-to-analog converter, an up-converter, a power amplifier, an attenuation coupler, a down-converter, a low-pass filter and an analog-to-digital converter to generate a band-limited digital baseband signal y (n); the digital predistortion signal xpdAnd (n) respectively sending the band-limited digital baseband signals y (n) into a digital predistortion model training module based on a band-limited selection affine function model for training to obtain predistortion parameters, and sending the predistortion parameters into the digital predistorter based on the band-limited selection affine function model.
Further, the band limiting degree selection affine function model is shown as formulas (1) and (2):
in the formula (1) and the formula (2), xpd(n) is the output signal of the digital predistorter, i is 1, 2, 3 or 4, M represents the memory depth, K represents the filter order, L represents the number of intervals into which the amplitude-selecting affine function is divided, βlA threshold value representing each of the intervals is set,
and the predistortion parameters in the first threshold interval with the memory depth of m and the filter order of k are represented, wherein A and B are the predistortion parameters. There are 4 different terms in formula (1), superscripts (1) - (4) corresponding to the different terms in formula (1); x is the number of*(n) denotes the conjugate of the baseband signal x (n).
A power amplifier digital predistortion method based on an affine function model with amplitude limiting selection comprises the following steps:
step S1, sending the input digital baseband signal x (n) to a digital predistorter based on an affine function model with amplitude limiting degree selection, and carrying out predistortion processing on the input digital baseband signal x (n) to generate digital signalsPredistortion signal xpd(n), wherein the digital predistorter comprises a digital predistortion model that selects an affine function model based on the band clipping degree;
step S2, the digital predistortion signal xpd(n) performing digital-to-analog conversion, sending the digital-to-analog conversion to an up-converter, and raising power through a power amplifier to generate an analog radio frequency signal;
step S3, the analog radio frequency signal obtained in step S2 is processed by attenuation, down conversion, filtering and analog-digital conversion in the attenuation coupler, the down converter, the low pass filter and the analog-digital converter in sequence, and a band-limited digital baseband signal y (n) is generated;
step S4, inputting the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) into the digital predistortion model with the band-limited affine function model for training, so as to obtain predistortion parameters of the digital predistortion model.
Further, the step S4 specifically includes:
step S401, acquiring the input digital baseband signal x (n) and the band-limited digital baseband signal y (n), and performing normalization and alignment processing;
step S402, determining memory depth M of band-limited amplitude selection affine function model, filter order K, number L of intervals into which amplitude selection affine function is divided and threshold value beta of each intervall；
Step S403, selecting the number L of intervals into which the affine function is divided and the threshold value beta of each interval according to the memory depth M, the filter order K and the amplitudelAnd performing predistortion parameter training on the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) by using a least square method, calculating predistortion parameters and sending the predistortion parameters to a digital predistorter for selecting an affine function model based on band-limited degree.
Further, the threshold values of the intervals are uniformly distributed between 0 and 1, betal＝(l-1)/L。
The invention has the beneficial effects that:
1. the invention uses the amplitude selection affine function, greatly reduces the using quantity of the multiplier and the adder in the BL-CPWL model, and reduces the complexity of digital signal processing;
2. the affine function model with amplitude limiting selection realizes digital predistortion of a broadband power amplifier under the condition of limited bandwidth, and obtains a linearization effect slightly superior to that of a BL-CPWL model.
Drawings
Fig. 1 is a schematic structural diagram of a digital predistortion apparatus provided in embodiment 1;
FIG. 2 is a comparison graph of the power amplifier output power spectra before and after predistortion in example 1;
FIG. 3 is a comparison graph of the AM/AM curves of the power amplifier output before and after predistortion in embodiment 1;
fig. 4 is a comparison graph of AM/PM curves of the power amplifier output before and after predistortion in embodiment 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 4, the present embodiment provides a power amplifier digital predistortion apparatus based on an affine function model with amplitude limiting selection, which specifically includes:
selecting a digital predistorter of an affine function model based on the band limiting degree: the digital predistorter based on the affine function model with amplitude limiting degree selection comprises a digital predistortion model based on the affine function model with amplitude limiting degree selection, and is used for carrying out predistortion processing on an input digital baseband signal x (n) to generate a digital predistortion signal xpd(n)；
A digital-to-analog converter: for digital predistortion signal xpd(n) performing digital-to-analog conversion;
an up converter: performing up-conversion on an output signal of the digital-to-analog converter to generate a radio frequency signal in the working frequency band of the power amplifier;
a power amplifier: amplifying and outputting an output signal of the up-converter;
an attenuation coupler: attenuating and coupling the output signal of the power amplifier;
band-pass filter: performing band-pass filtering on the output signal of the attenuation coupler;
a down converter: down-converting the output signal of the attenuating coupler;
a low-pass filter: low-pass filtering an output signal of the down converter;
an analog-to-digital converter: performing analog-to-digital conversion on the output signal of the low-pass filter to generate a band-limited digital baseband signal y (n);
the digital predistortion model training module selects an affine function model based on the amplitude limiting degree: and carrying out power amplifier digital predistortion model training on the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) based on the band-limiting degree selection affine function model to generate predistortion parameters, and sending predistortion coefficients to a digital predistorter based on the band-limiting degree selection affine function model.
Specifically, in this embodiment, the band limiting degree selection affine function model is shown by the following two formulas:
in the formula, xpd(n) is the predistorter output signal, i is 1, 2, 3 or 4, M represents the memory depth, K represents the filter order, L represents the number of intervals into which the amplitude-selecting affine function is divided, βlA threshold value representing each of the intervals is set,
representing a predistortion parameter, x, in a first threshold interval with a memory depth of m and a filter order of k*(n) denotes the conjugate of the baseband signal x (n).
The embodiment also provides a power amplifier digital predistortion method based on the affine function model with amplitude limiting selection, and the digital predistortion method based on the digital predistortion device comprises the following steps:
step S1: sending an input digital baseband signal x (n) into a digital predistorter based on a band limiting degree selection affine function model, wherein the digital predistorter based on the band limiting degree selection affine function model comprises a digital predistortion model based on the band limiting degree selection affine function model, and carrying out predistortion treatment on the input digital baseband signal x (n) to generate a digital predistortion signal x (n)pd(n)；
Step S2: digital predistortion signal xpd(n) performing digital-to-analog conversion, sending the digital-to-analog conversion to an up-converter, and raising power through a power amplifier to generate an analog radio frequency signal;
step S3: the analog radio frequency signal is attenuated, down-converted, filtered and analog-to-digital converted by the attenuation coupler, the down-converter, the low-pass filter and the analog-to-digital converter in sequence to generate a band-limited digital baseband signal y (n);
step S4: and carrying out power amplifier digital predistortion model training on the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) based on the band-limited selection affine function model, and determining digital predistortion model parameters based on the band-limited selection affine function model.
Specifically, in this embodiment, the step S4 includes the following steps:
step S401: acquiring an input digital baseband signal x (n) and a band-limited digital baseband signal y (n), and carrying out normalization and alignment processing;
step S402: determining memory depth M of band-limited amplitude selection affine function model, filter order K, number L of intervals into which amplitude selection affine function is divided and threshold value beta of each intervall；
Step S403: selecting the number L of intervals divided by the affine function and the threshold value beta of each interval according to the memory depth M, the filter order K and the amplitudelAnd performing predistortion parameter training on the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) by using a least square method, calculating predistortion parameters and sending the predistortion parameters to a digital predistorter based on a band-limited selection affine function model.
Specifically, in the present embodiment, the threshold values of the intervals are uniformly distributed between 0 and 1, βl＝(l-1)/L。
Specifically, in this embodiment, in order to test the performance of the power amplifier digital predistortion device based on the affine function model with amplitude limitation and the power amplifier digital predistortion method based on the affine function model with amplitude limitation on the broadband power amplifier predistortion performance, taking a five-carrier LTE signal with an input baseband signal of 20MHz bandwidth and 7dB peak-to-average ratio, a power amplifier with a modulation frequency of 2.14GHz and a center frequency of 2.14GHz as an example, after the input and output data of the power amplifier are aligned synchronously, normalization processing is performed.
The sampling rate of the analog-to-digital converter is 40MSPS, the predistortion model parameter is determined as M being 3, L being 4 and K being 4, the power spectrogram of the power amplifier output signal before and after the power amplifier digital predistortion technology provided by the invention is shown in fig. 2, and the Adjacent Channel Power Ratio (ACPR) is shown in table 1. After the power amplifier digital predistortion technology provided by the invention is adopted, the ACPR of two sidebands of an output signal is reduced by more than 15dB, which shows that the out-of-band distortion of the signal is well compensated, and the nonlinearity of the power amplifier is well improved.
TABLE 1
In addition, the AM/AM curves and the AM/PM curves of the front and rear power of the power amplifier digital predistortion technique proposed by this embodiment are shown in fig. 3 and 4. Therefore, the AM/AM curve and the AM/PM curve after predistortion are obviously improved, which shows that the nonlinear characteristic and the memory effect of the power amplifier are well compensated. Therefore, the BL-CPWL model is simplified, the number of multipliers and adders in the model is greatly reduced, the complexity of digital signal processing is reduced, the digital predistortion algorithm is faster, and a good predistortion effect can be realized.
In summary, the power amplifier digital predistortion device and method based on the band-limited selection affine function model provided by the invention simplify the traditional band-limited model, greatly reduce the number of multipliers in the traditional band-limited model, reduce the memory resource consumption during the digital predistortion signal processing, make the digital predistortion algorithm faster, and realize better predistortion effect.
The invention is not described in detail, but is well known to those skilled in the art.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The utility model provides a power amplifier digital predistortion device based on take amplitude limit to select affine function model which characterized in that includes: the digital predistorter selects an affine function model based on the clipping degree, and performs predistortion processing on an input digital baseband signal x (n) to generate a digital predistortion signal xpd(n); the digital predistortion signal xpd(n) sequentially passing through a digital-to-analog converter, an up-converter, a power amplifier, an attenuation coupler, a down-converter, a low-pass filter and an analog-to-digital converter to generate a band-limited digital baseband signal y (n); the digital predistortion signal xpd(n) and the band-limited digital baseband signal y (n) are respectively sent to a digital predistortion model training module based on an affine function model with amplitude limitation selection for training to obtain predistortion parameters, and the predistortion parameters are sent to the baseAnd selecting a digital predistorter of an affine function model at the band limiting degree.
2. The power amplifier digital predistortion device based on affine function model with amplitude limiting selection as claimed in claim 1 is characterized in that the affine function model with amplitude limiting selection is as shown in formulas (1) and (2):
in the formula (1) and the formula (2), xpd(n) is the output signal of the digital predistorter, i is 1, 2, 3 or 4, M represents the memory depth, K represents the filter order, L represents the number of intervals into which the amplitude-selecting affine function is divided, βlA threshold value representing each of the intervals is set,
representing a predistortion parameter, x, in a first threshold interval with a memory depth of m and a filter order of k*(n) denotes the conjugate of the baseband signal x (n).
3. A power amplifier digital predistortion method based on an affine function model with amplitude limiting selection is characterized by comprising the following steps:
step S1, sending the input digital baseband signal x (n) into a digital predistorter based on an affine function model with amplitude limiting degree selection, and carrying out predistortion processing on the input digital baseband signal x (n) to generate a digital predistortion signal xpd(n), wherein the digital predistorter comprises a digital predistortion model that selects an affine function model based on the band clipping degree;
step S2, the digital predistortion signal xpd(n) performing digital-to-analog conversion, sending the digital-to-analog converted signal to an up-converter, and raising the digital-to-analog converted signal by a power amplifierPower, generating an analog radio frequency signal;
step S3, the analog radio frequency signal obtained in step S2 is processed by attenuation, down conversion, filtering and analog-digital conversion in the attenuation coupler, the down converter, the low pass filter and the analog-digital converter in sequence, and a band-limited digital baseband signal y (n) is generated;
step S4, inputting the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) into the digital predistortion model with the band-limited affine function model for training, so as to obtain predistortion parameters of the digital predistortion model.
4. The power amplifier digital predistortion method based on affine function model with amplitude limiting selection according to claim 3, wherein the step S4 specifically comprises:
step S401, acquiring the input digital baseband signal x (n) and the band-limited digital baseband signal y (n), and performing normalization and alignment processing;
step S402, determining memory depth M of band-limited amplitude selection affine function model, filter order K, number L of intervals into which amplitude selection affine function is divided and threshold value beta of each intervall；
Step S403, selecting the number L of intervals into which the affine function is divided and the threshold value beta of each interval according to the memory depth M, the filter order K and the amplitudelAnd performing predistortion parameter training on the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) by using a least square method, calculating predistortion parameters and sending the predistortion parameters to a digital predistorter for selecting an affine function model based on band-limited degree.
5. The power amplifier digital predistortion method based on affine function model with amplitude limiting selection as claimed in claim 4, characterized in that the threshold value of each interval is uniformly distributed between 0 and 1, βl＝(l-1)/L。
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