CN113612454B - Power amplifier digital predistortion device and method based on affine function model with amplitude limiting degree selection - Google Patents
Power amplifier digital predistortion device and method based on affine function model with amplitude limiting degree selection Download PDFInfo
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- 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
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- 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
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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Abstract
The invention discloses a power amplifier digital predistortion device and a method based on affine function model with amplitude limiting degree selection, comprising the following steps: 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 based on the affine function model with clipping. Compared with the prior art, the invention greatly reduces the number of multipliers in the traditional band-limited model, reduces the memory resource consumption during the processing of the digital predistortion signals, has quicker 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 affine function model with amplitude limiting degree selection.
Background
With the development of wireless communication technology, there are demands for higher communication rate, data capacity, etc., and in order to increase the data rate and network capacity of the fifth generation (5G) communication system, one of the effective methods is to directly use a larger modulation bandwidth. As the bandwidth of the signal gets wider, the signal quality is further degraded by the nonlinear and memory characteristics of the wideband power amplifier in the communication system.
The digital predistortion technology becomes one of the most common power amplification 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 demands on performances such as sampling rate of an analog-to-digital converter and a digital-to-analog converter in a digital predistortion system, and communication cost and hardware implementation 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, a Band-Limited Canonical Piecewise-Linear Function-Based Behavioral Model for Wideband Power Amplifiers (BL-CPWL) model is provided, compared with a Band-limited SDDR (BL-SDDR) model, the model calculation complexity is reduced, the flexibility is improved, but a large number of multiplication and addition operations still exist in the model.
Disclosure of Invention
Therefore, the present invention is directed to a power amplifier digital predistortion device and method for selecting affine function model based on band limiting degree, which are used for solving the technical problems mentioned in the background art and reducing the complexity of the existing band limiting power amplifier behavioral model.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a power amplifier digital predistortion device based on affine function model with clipping degree selection, comprising: digital predistorter based on affine function model with clipping degree selection, which predistorter predistorts an input digital baseband signal x (n) to produce a digital predistorted signal x pd (n); the digital predistortion signal x pd (n) generating a band limited digital baseband signal y (n) sequentially 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; the digital predistortion signal x pd And (n) and the band-limited digital baseband signal y (n) are respectively sent to a digital predistortion model training module for training based on the band limiting degree selection affine function model to obtain predistortion parameters, and the predistortion parameters are sent to the digital predistorter based on the band limiting degree selection affine function model.
Further, the affine function model with clipping degree selection is shown in formulas (1) and (2):
in the formula (1) and the formula (2), x pd (n) output signal of digital predistorter, i=1, 2, 3 or 4, m represents memory depth, K represents filter order, L represents number of sections divided by amplitude selection affine function, β l A threshold value representing each interval is represented,representing predistortion parameters in a first threshold interval with a memory depth of m and a filter order of k, wherein A and B are both predistortion parameters. There are 4 different terms in equation (1), and superscripts (1) - (4) correspond to the different terms in equation (1); x is x * (n) represents the conjugate of the baseband signal x (n).
A power amplifier digital predistortion method based on affine function model with amplitude limiting degree selection comprises the following steps:
step S1, an input digital baseband signal x (n) is sent into a digital predistorter which selects an affine function model based on the band limiting degree, predistortion processing is carried out on the input digital baseband signal x (n) to generate a digital predistortion signal x pd (n) wherein the digital predistorter comprises a digital predistortion model that selects an affine function model based on the band clipping;
step S2, the digital predistortion signal x pd (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 signals obtained in the step S2 are sequentially subjected to attenuation, down-conversion, filtering and analog-to-digital conversion in an attenuation coupler, a down-converter, a low-pass filter and an analog-to-digital converter to generate band-limited digital baseband signals y (n);
and 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 amplitude limiting degree selection affine function model for training, and obtaining predistortion parameters of the digital predistortion model.
Further, the step S4 specifically includes:
step S401, the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) are obtained, and normalization and alignment processing are carried out;
step S402, determining the memory depth M of the affine function model with clipping degree selection, the filter order K, the number L of intervals divided by the affine function with amplitude selection and the threshold value beta of each interval l ；
Step S403, selecting the number L of the sections divided by the affine function and the threshold value beta of each section according to the memory depth M, the filter order K, the amplitude l And carrying out 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 into a digital predistorter for selecting an affine function model based on the band limiting degree.
Further, the threshold value of each interval is uniformly distributed between 0 and 1, beta l ＝(l-1)/L。
The beneficial effects of the invention are as follows:
1. the invention uses amplitude to select affine function, greatly reduces the use quantity of multipliers and adders in BL-CPWL model, and reduces the complexity of digital signal processing;
2. the affine function model with amplitude limiting degree selection realizes digital predistortion of a broadband power amplifier under the condition of limited bandwidth, and achieves a linearization effect slightly better than that of a BL-CPWL model.
Drawings
Fig. 1 is a schematic structural diagram of a digital predistortion device provided in embodiment 1;
fig. 2 is a graph showing comparison of power amplifier output power spectra before and after predistortion in embodiment 1;
FIG. 3 is a graph showing the comparison of the AM/AM curves of the power amplifier before and after predistortion in example 1;
fig. 4 is a graph showing comparison of AM/PM curves of power amplifier outputs before and after predistortion in embodiment 1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 to fig. 4, the present embodiment provides a power amplifier digital predistortion device based on affine function model with clipping degree selection, which specifically includes:
selecting a digital predistorter of an affine function model based on the band clipping: the digital predistorter based on affine function model with clipping degree comprises a digital predistortion model based on affine function model with clipping degree, and predistorts an input digital baseband signal x (n) to generate a digital predistortion signal x pd (n)；
A digital-to-analog converter: for a digital predistortion signal x pd (n) performing digital-to-analog conversion;
an up-converter: up-converting an output signal of the digital-to-analog converter to generate a radio frequency signal in an operating frequency band of the power amplifier;
a power amplifier: amplifying and outputting an output signal of the up-converter;
attenuation coupler: attenuating and coupling the output signal of the power amplifier;
band-pass filter: band-pass filtering 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 the output signal of the down converter;
an analog-to-digital converter: analog-to-digital conversion is carried out on the output signal of the low-pass filter to generate a band-limited digital baseband signal y (n);
a digital predistortion model training module for selecting an affine function model based on the band clipping: and training the power amplification digital predistortion model of 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 the predistortion parameters to a digital predistorter of the band limiting degree selection affine function model.
Specifically, in this embodiment, the affine function model with clipping degree selection is shown in the following two formulas:
in the formula, x pd (n) is a predistorter output signal, i=1, 2, 3 or 4, m represents a memory depth, K represents a filter order, L represents the number of sections divided by an amplitude selection affine function, β l A threshold value representing each interval is represented, representing predistortion parameters in a first threshold interval, x, with a memory depth of m and a filter order of k * (n) represents 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 degree, which is based on the digital predistortion device and comprises the following steps:
step S1: the input digital baseband signal x (n) is sent to a digital predistorter based on affine function model with clipping degree, the digital predistorter based on affine function model with clipping degree comprises a digital predistortion model based on affine function model with clipping degree, predistortion treatment is carried out on the input digital baseband signal x (n) to generate a digital predistortion signal x pd (n)；
Step S2: the digital predistortion signal x pd (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 sequentially passes through an attenuation coupler, a down converter, a low-pass filter and an analog-to-digital converter to carry out attenuation, down conversion, filtering and analog-to-digital conversion to generate a band-limited digital baseband signal y (n);
step S4: and performing power amplification digital predistortion model training based on the band limiting degree selection affine function model on the input digital baseband signal x (n) and the band limiting digital baseband signal y (n), and determining digital predistortion model parameters based on the band limiting degree selection affine function model.
Specifically, in the present 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 performing normalization and alignment processing;
step S402: determining a memory depth M of an affine function model with clipping degree selection, a filter order K, the number of intervals L into which an amplitude selection affine function is divided, and a threshold value beta of each interval l ；
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 amplitude l The input digital baseband signal x (n) and the band-limited digital baseband signal y (n) are subjected to predistortion parameter training by using a least square method, predistortion parameters are calculated and sent to a digital predistorter which selects an affine function model based on the band clipping degree.
Specifically, in the present embodiment, the threshold value of each section is uniformly distributed between 0 and 1, β l ＝(l-1)/L。
Specifically, in this embodiment, in order to test the performance of a power amplification digital predistortion device based on an affine function model with clipping degree selection and a power amplification digital predistortion method based on an affine function model with clipping degree selection in broadband power amplification predistortion performance, a power amplification with an input baseband signal of five carrier wave LTE signal with a peak-to-average ratio of 7dB in a bandwidth of 20MHz, a modulation frequency of 2.14GHz, and a center frequency of 2.14GHz is taken as an example, and after input and output data of the power amplification are synchronously aligned, normalization processing is performed.
The sampling rate of the analog-digital converter is 40MSPS, the predistortion model parameters are determined to be m=3, l=4 and k=4, the power spectrograms of the power amplifier output signals before and after the power amplifier digital predistortion technology provided by the invention are shown in fig. 2, and the Adjacent Channel Power Ratio (ACPR) is shown in table 1. It can be seen that after the power amplification 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 indicates that the out-of-band distortion of the signal is well compensated, and the nonlinearity of the power amplification is well improved.
TABLE 1
In addition, the AM/AM curve and the AM/PM curve of the front and rear power of the power amplification digital predistortion technology provided by the embodiment are shown in fig. 3 and fig. 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. From the above, the present embodiment simplifies the BL-CPWL model, greatly reduces the number of multipliers and adders in the model, reduces the complexity of digital signal processing, makes the digital predistortion algorithm faster, and can achieve a good predistortion effect.
In summary, the power amplifier digital predistortion device and the method based on the band-limited degree 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 digital predistortion signal processing, realize faster digital predistortion algorithm and realize better predistortion effect.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (2)
1. A power amplifier digital predistortion device based on affine function model with clipping degree selection, comprising: digital predistorter based on affine function model with clipping degree selection, which predistorter predistorts an input digital baseband signal x (n) to produce a digital predistorted signal x pd (n); the digital predistortion signal x pd (n) generating a band limited digital baseband signal y (n) sequentially 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; the digital predistortion signal x pd Respectively sending the band-limited digital baseband signal y (n) and the band-limited digital baseband signal y (n) into a digital predistortion model training module which selects an affine function model based on the band limiting degree to train to obtain predistortion parameters, and sending the predistortion parameters into a digital predistorter which selects the affine function model based on the band limiting degree;
the band clipping degree selection affine function model is shown in formulas (1) and (2):
in the formula (1) and the formula (2), x pd (n) output signal of digital predistorter, i=1, 2, 3 or 4, m represents memory depth, K represents filter order, L represents number of sections divided by amplitude selection affine function, β l A threshold value representing each interval is represented, representing predistortion parameters in a first threshold interval, x, with a memory depth of m and a filter order of k * (n) represents the conjugate of the baseband signal x (n).
2. The power amplifier digital predistortion method based on affine function model with amplitude limiting degree selection is characterized by comprising the following steps:
step S1, an input digital baseband signal x (n) is sent into a digital predistorter which selects an affine function model based on the band limiting degree, predistortion processing is carried out on the input digital baseband signal x (n) to generate a digital predistortion signal x pd (n) wherein the digital predistorter comprises a digital predistortion model that selects an affine function model based on the band clipping;
step S2, the digital predistortion signal x pd (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 signals obtained in the step S2 are sequentially subjected to attenuation, down-conversion, filtering and analog-to-digital conversion in an attenuation coupler, a down-converter, a low-pass filter and an analog-to-digital converter to generate band-limited digital baseband signals y (n);
s4, inputting the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) into a digital predistortion model with an affine function model selected by the limiting degree for training, and obtaining predistortion parameters of the digital predistortion model;
the step S4 specifically includes:
step S401, the input digital baseband signal x (n) and the band-limited digital baseband signal y (n) are obtained, and normalization and alignment processing are carried out;
step S402, determining the memory depth M, the filter order K and the amplitude of the affine function model with amplitude limiting degree selectionThe number of intervals L into which the degree selection affine function is divided and the threshold value beta of each interval l ；
Step S403, selecting the number L of the sections divided by the affine function and the threshold value beta of each section according to the memory depth M, the filter order K, the amplitude l 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 into a digital predistorter for selecting an affine function model based on band limiting degree;
the threshold value of each interval is uniformly distributed between 0 and 1, beta l ＝(l-1)/L。
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| TW201115915A (en) * | 2009-10-23 | 2011-05-01 | Ralink Technology Corp | Method for pre-distorting power amplifier and the circuit thereof |
| US8681894B2 (en) * | 2009-11-03 | 2014-03-25 | Telefonaktiebolaget L M (Publ) | Digital affine transformation modulated power amplifier for wireless communications |
| US10382073B2 (en) * | 2015-11-03 | 2019-08-13 | Infineon Technologies Ag | Analog RF pre-distorter and non-linear splitter |
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| CN106877825A (en) * | 2017-01-25 | 2017-06-20 | 东南大学 | The digital predistortion apparatus and method of the simplified nonlinear filter based on band limit |
| CN108199690A (en) * | 2018-01-05 | 2018-06-22 | 东南大学 | The power amplifier digital predistortion apparatus and method of band limit DDR function models based on cubic spline |
| CN109347452A (en) * | 2018-10-17 | 2019-02-15 | 东南大学 | Double frequency power amplifier digital predistortion apparatus and method based on piecewise linear function |
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