CN112054776B - Power amplification linearization method for mixing analog predistortion and in-band digital predistortion - Google Patents
Power amplification linearization method for mixing analog predistortion and in-band digital predistortion Download PDFInfo
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Abstract
The invention discloses a power amplification method for mixing analog predistortion and in-band digital predistortion, which comprises the steps of firstly connecting a vector signal generator, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer to obtain a nonlinear power spectrum, then connecting the vector signal generator, the analog predistortion device, a driving power amplifier, the millimeter wave radio frequency power amplifier, the attenuator and the spectrum analyzer to perform analog predistortion to obtain a linear power spectrum after analog predistortion, then combining matlab software, processing by using an MP model, then performing file format conversion to obtain a digital predistortion file, and finally connecting the vector signal generator, the analog predistortion device, the driving power amplifier, the millimeter wave radio frequency power amplifier, the attenuator and the spectrum analyzer to perform digital predistortion to obtain the linear power spectrum after combined processing of the analog predistortion and the digital predistortion; the method has the advantages of strong non-linear capability, low cost and capability of acquiring in-band signal data by only using the ADC with single bandwidth.
Description
Technical Field
The invention relates to a linearization method, in particular to a power amplification linearization method for mixing analog predistortion with in-band digital predistortion.
Background
The industrial information department issues a 5G (fifth generation mobile communication system, commonly called 5G) commercial license plate on 6 th and 6 th of 2019, which marks the formal 5G age of China. However, the current 5G commercial frequency band is only a frequency band lower than 6GHz, and spectrum resources are still very intense. The millimeter wave frequency band has rich spectrum resources, can transmit large bandwidth signals, increases the user capacity, and provides core powerful support for everything interconnection and M2M reliable low-delay communication.
However, the millimeter wave radio frequency power amplifier, which is one of the core components of the transmitting front end of the wireless communication system, is the module with the greatest energy consumption and the greatest influence on the quality of the transmitted signal. The inherent nonlinearity of the millimeter wave radio frequency power amplifier not only can generate out-of-band parasitic radiation to cause serious interference to adjacent (or separated) channels, but also can generate non-filterable noise to in-band signals, and the signal-to-noise ratio of the signals is reduced, so that the quality of information transmission of the millimeter wave radio frequency power amplifier is seriously affected. In addition, with the continuous increase of the demands of wireless communication systems for large capacity and fast speed, the non-constant envelope signal modulation mode has become the most widespread modulation mode in wireless communication, and the modulation degree is higher and higher, such as modulation modes of 64QAM, 128QAM, 512QAM, even 1024QAM, and the like. The high modulation degree entails a high peak-to-average power ratio (Peak to Average Power Ratio, PAPR), which puts more stringent demands on the linearity of the millimeter wave radio frequency power amplifier. In addition, as the bandwidth of wireless communication systems increases, the memory effect of millimeter wave radio frequency power amplifiers has become a non-negligible distortion component in broadband millimeter wave radio frequency power amplifier designs. And with the increase of bandwidth, the memory effect of the millimeter wave radio frequency power amplifier is stronger and more complex. The memory effect of the millimeter wave radio frequency power amplifier is the same as static nonlinearity, which can cause distortion of the power amplifier transmission signal and generation of out-of-band spurious spectrum. The memory effect of the millimeter wave radio frequency power amplifier is generated by a plurality of complicated reasons, such as signal loading effect of a bias circuit, thermal memory effect of the millimeter wave radio frequency power amplifier, memory effect caused by parasitic capacitance and inductance in the millimeter wave radio frequency power amplifier, charge and discharge of capacitance inductance of a peripheral circuit of the millimeter wave radio frequency power amplifier and the like, so that the linearization processing of the broadband millimeter wave radio frequency power amplifier is more difficult and complicated due to the memory effect of the millimeter wave radio frequency power amplifier. Therefore, in order to secure the communication quality of the millimeter wave communication system, the nonlinearity of the millimeter wave radio frequency power amplifier must be corrected.
Among the linearization techniques, the digital predistortion linearization technique (digital predistortion, DPD) has the advantages of simple implementation, strong nonlinear correction capability, stable and reliable performance, strong reconfigurable capability and the like, so that the digital predistortion linearization technique is widely applied to linearization of millimeter wave radio frequency power amplifiers in modern wireless communication systems. However, during training of the DPD model, 3-order intermodulation distortion and even 5-order intermodulation distortion of the millimeter wave radio frequency power amplifier need to be collected, so that the sampling bandwidth of the ADC is 3 times or even 5 times that of the input signal, which greatly aggravates the sampling bandwidth and sampling rate of the analog-to-digital converter (analog to digital converter, ADC) and increases the cost of the whole linearization. The analog predistortion linearization technology (analog predistortion, APD) has the advantages of very wide bandwidth, rapid correction speed, simple structure, low cost and the like, but the APD has weak nonlinear correction capability and cannot compensate the memory effect, so that the application range of the APD is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing the power amplification method which has strong linearization capability and can reduce the requirement of an ultra-wideband millimeter wave power amplification technology on the sampling bandwidth of 3-5 times of the ADC, and only needs a single-bandwidth ADC to collect in-band signal data to realize nonlinear correction, and has the advantages of low cost of mixing analog predistortion with in-band digital predistortion.
The technical scheme adopted for solving the technical problems is as follows: a power amplification method for mixing analog predistortion and in-band digital predistortion comprises the following steps:
(1) Connecting a signal output port of the vector signal generator with a signal input port of the millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of the attenuator, and connecting a signal output port of the attenuator with a signal input port of the spectrum analyzer;
(2) The vector signal generator, the millimeter wave radio frequency power amplifier, the attenuator and the spectrum analyzer are started, a 5GNR signal is selected in the vector signal generator to be output, then the frequency parameter of the spectrum analyzer is set to be the working center frequency of the millimeter wave radio frequency power amplifier, the bandwidth parameter of the spectrum analyzer is set to be the bandwidth of the 5GNR signal, a curve is displayed on the spectrum analyzer, the curve is called a first curve, the first curve is the nonlinear power spectrum of the millimeter wave radio frequency power amplifier, and the first curve is locked by utilizing the function of locking the curve of the spectrum analyzer.
(3) Disconnecting the connection between the signal input port of the millimeter wave radio frequency power amplifier and the signal output port of the vector signal generator;
(4) Connecting a signal output port of a vector signal generator with a signal input port of an analog predistorter, connecting a signal output port of the analog predistorter with a signal input port of a driving power amplifier, connecting a signal output port of the driving power amplifier with a signal input port of a millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of an attenuator, connecting a signal output port of the attenuator with a signal input port of a low-pass filter, and connecting a signal input port of the low-pass filter with a signal input port of a spectrum analyzer;
(5) Starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, selecting a 5GNR signal in the vector signal generator for output, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as a bandwidth of the 5GNR signal, and generating a graph on the spectrum analyzer, wherein the graph comprises two curves, one curve is a first curve locked in the step (2), the other curve is a newly added curve, the magnitude of signal power is adjusted in the vector signal generator, so that a peak value of the newly added curve is adjusted to be at the same position as a peak value of the first curve, a second curve is obtained, the second curve is locked by utilizing a locking curve function of the spectrum analyzer, and the second curve is a linearized power spectrum of the millimeter wave radio frequency power amplifier after analog predistortion;
(6) Disconnecting the signal output port of the vector signal generator from the signal input port of the analog predistorter, disconnecting the signal output port of the analog predistorter from the signal input port of the driving power amplifier, disconnecting the signal output port of the driving power amplifier from the signal input port of the millimeter wave radio frequency power amplifier, disconnecting the signal output port of the millimeter wave radio frequency power amplifier from the signal input port of the attenuator, and disconnecting the signal output port of the attenuator from the signal input port of the spectrum analyzer;
(7) Acquiring in-band signal data, namely corresponding data on a second curve, by utilizing a data acquisition function of a spectrum analyzer, storing the acquired data as an iq.tar file, namely an analog predistortion file, performing format conversion on the analog predistortion file on a computer by using an R & S ARB Toolbox, converting the analog predistortion file into a file with the suffix of. Txt or. Csv, and referring the file as a first conversion file; the method comprises the steps of carrying out a first treatment on the surface of the
(8) Importing a first conversion file into matlab, processing the first conversion file by using a memory polynomial model (Memory Polynomial, MP model) to obtain a file with a suffix name of. Txt, namely a second conversion file, and carrying out format conversion on the second conversion file by using an R & S ARB Toolbox to obtain a file with the suffix name of. Wv format, wherein the file is a digital predistortion file;
(9) Connecting a signal output port of a vector signal generator with a signal input port of an analog predistorter, connecting a signal output port of the analog predistorter with a signal input port of a driving power amplifier, connecting a signal output port of the driving power amplifier with a signal input port of a millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of an attenuator, and connecting a signal output port of the attenuator with a signal input port of a spectrum analyzer;
(10) The method comprises the steps of starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, guiding a digital predistortion file into the vector signal generator, selecting a digital predistortion file for output in the vector signal generator, acquiring a bandwidth corresponding to the digital predistortion file at the position of the vector signal generator, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as the bandwidth corresponding to the digital predistortion file, and at the moment, generating a graph on the spectrum analyzer, wherein the graph comprises three curves, namely the first curve locked in the step (2), the second curve locked in the step (5) and a new curve, adjusting the signal power in the vector signal generator, enabling the peak value of the new curve to be positioned at the same position as the peak value of the first curve, and obtaining a third curve, locking the third curve by utilizing a locking curve function of the spectrum analyzer, namely the millimeter wave radio frequency power amplifier, and completing the linearization of the millimeter wave radio frequency power amplifier after analog predistortion and digital predistortion.
Compared with the prior art, the invention has the advantages that the nonlinear power spectrum of the millimeter wave radio frequency power amplifier is obtained after the vector signal generator, the millimeter wave radio frequency power amplifier, the attenuator and the spectrum analyzer are connected, then the nonlinear power spectrum is based on the nonlinear power spectrum after the vector signal generator, the analog predistorter, the driving power amplifier, the millimeter wave radio frequency power amplifier, the attenuator, the low-pass filter and the spectrum analyzer are connected, the linearized power spectrum after the analog predistortion of the millimeter wave radio frequency power amplifier is obtained, then the signal of the low-pass filter is based on the linearized power spectrum, only the signal in the millimeter wave radio frequency power amplifier band is filtered, thus the redundant out-of-band distortion is filtered, the signal output by the low-pass filter is transmitted into the spectrum analyzer, and then the analog signal is converted into the digital signal, the method combines the analog predistortion and the high-efficiency linearization of the digital predistortion, completes linearization of the millimeter wave radio frequency power amplifier, can reduce the requirement of ultra-wideband millimeter wave power amplification technology on ADC 3-5 times sampling bandwidth, only needs single-bandwidth ADC to collect in-band signal data to realize nonlinear correction, the sampling rate of the ADC is greatly reduced, the implementation mode is simple, the cost is low, and the nonlinear correction capability is strong.
Drawings
FIG. 1 is a diagram of a connection framework of step (1) of the power amplification method of the present invention in which analog predistortion and in-band digital predistortion are mixed;
FIG. 2 is a graph of nonlinear power spectrum of a millimeter wave radio frequency power amplifier obtained by the method of amplification of mixed analog predistortion and in-band digital predistortion of the present invention;
FIG. 3 is a connection frame diagram of step (4) of the power amplifier linearization method of the invention combining analog predistortion with in-band digital predistortion;
FIG. 4 is a graph of the combined analog predistortion and in-band digital predistortion power amplifier linearization method of the invention after analog predistortion;
FIG. 5 is a connection frame diagram of step (9) of the power amplifier linearization method of the invention combining analog predistortion with in-band digital predistortion;
fig. 6 is a graph of the power amplifier linearization method of the invention in which analog predistortion and in-band digital predistortion are mixed after performing analog predistortion and digital predistortion.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Examples: a power amplification method for mixing analog predistortion and in-band digital predistortion comprises the following steps:
(1) As shown in fig. 1, a signal output port of the vector signal generator is connected with a signal input port of the millimeter wave radio frequency power amplifier, a signal output port of the millimeter wave radio frequency power amplifier is connected with a signal input port of the attenuator, and a signal output port of the attenuator is connected with a signal input port of the spectrum analyzer;
(2) The vector signal generator, the millimeter wave radio frequency power amplifier, the attenuator and the spectrum analyzer are started, a 5GNR signal is selected in the vector signal generator to be output, then the frequency parameter of the spectrum analyzer is set to be the working center frequency of the millimeter wave radio frequency power amplifier, the bandwidth parameter of the spectrum analyzer is set to be the bandwidth of the 5GNR signal, a graph is displayed on the spectrum analyzer at the moment, the graph comprises a curve, the curve is called a first curve, the first curve is the nonlinear power spectrum of the millimeter wave radio frequency power amplifier, and the first curve is locked by utilizing the function of the locking curve of the spectrum analyzer, so that the first curve is locked. Analysis of fig. 2 shows that: the nonlinear distortion amount of the millimeter wave radio frequency power amplifier before linearization treatment is obvious.
(3) Disconnecting the connection between the signal input port of the millimeter wave radio frequency power amplifier and the signal output port of the vector signal generator;
(4) As shown in fig. 3, the signal output port of the vector signal generator is connected with the signal input port of the analog predistorter, the signal output port of the analog predistorter is connected with the signal input port of the driving power amplifier, the signal output port of the driving power amplifier is connected with the signal input port of the millimeter wave radio frequency power amplifier, the signal output port of the millimeter wave radio frequency power amplifier is connected with the signal input port of the attenuator, the signal output port of the attenuator is connected with the signal input port of the low-pass filter, and the signal input port of the low-pass filter is connected with the signal input port of the spectrum analyzer; (5) Starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, selecting a 5GNR signal in the vector signal generator for output, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as a bandwidth of the 5GNR signal, and generating a graph on the spectrum analyzer, wherein the graph comprises two curves, one curve is a first curve locked in the step (2) and the other curve is a new curve, the magnitude of the signal power is adjusted in the vector signal generator, so that the peak value of the new curve is adjusted to be at the same position as the peak value of the first curve, a second curve is obtained, the second curve is locked by utilizing a locking curve function of the spectrum analyzer, and the second curve is a linearized power spectrum after analog predistortion of the millimeter wave radio frequency power amplifier; analysis of fig. 4 shows that: compared with the first curve, the second curve has obviously reduced nonlinear distortion, so that the nonlinearity of the millimeter wave radio frequency power amplifier is improved to a certain extent after analog predistortion.
(6) Disconnecting the signal output port of the vector signal generator from the signal input port of the analog predistorter, disconnecting the signal output port of the analog predistorter from the signal input port of the driving power amplifier, disconnecting the signal output port of the driving power amplifier from the signal input port of the millimeter wave radio frequency power amplifier, disconnecting the signal output port of the millimeter wave radio frequency power amplifier from the signal input port of the attenuator, and disconnecting the signal output port of the attenuator from the signal input port of the spectrum analyzer;
(7) Acquiring in-band signal data, namely corresponding data on a second curve, by utilizing a data acquisition function of a spectrum analyzer, storing the acquired data as an iq.tar file, namely an analog predistortion file, performing format conversion on the analog predistortion file on a computer by using an R & S ARB Toolbox, converting the analog predistortion file into a file with the suffix of. Txt or. Csv, and referring the file as a first conversion file; the method comprises the steps of carrying out a first treatment on the surface of the
(8) Importing a first conversion file into a matlab, processing the first conversion file by using an MP model to obtain a file with a suffix name of. Txt, namely a second conversion file, and carrying out format conversion on the second conversion file by using an R & S ARB Toolbox to obtain a file with a suffix name of. Wv format, namely a digital predistortion file;
(9) As shown in fig. 5, the signal output port of the vector signal generator is connected with the signal input port of the analog predistorter, the signal output port of the analog predistorter is connected with the signal input port of the driving power amplifier, the signal output port of the driving power amplifier is connected with the signal input port of the millimeter wave radio frequency power amplifier, the signal output port of the millimeter wave radio frequency power amplifier is connected with the signal input port of the attenuator, and the signal output port of the attenuator is connected with the signal input port of the spectrum analyzer;
(10) The method comprises the steps of starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, guiding a digital predistortion file into the vector signal generator, selecting a digital predistortion file for output in the vector signal generator, acquiring a bandwidth corresponding to the digital predistortion file at the position of the vector signal generator, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as the bandwidth corresponding to the digital predistortion file, and at the moment, generating a graph on the spectrum analyzer, wherein the graph comprises three curves, the three curves are respectively a first curve locked in the step (2), a second curve locked in the step (5) and a newly-increased curve, adjusting the power of a signal in the vector signal generator, enabling a newly-increased peak value to be in the same position as the peak value of the first curve, locking the third curve by utilizing a locking curve function of the spectrum analyzer, and completing the linearization of the millimeter wave power of the radio frequency power amplifier after the analog predistortion and the digital predistortion are combined. As can be seen from an analysis of fig. 6: the nonlinear distortion of the third curve is further improved relative to the second curve, and compared with the first curve, the nonlinear distortion is extremely obvious, so that the effect of linearizing the millimeter wave radio frequency power amplifier is obvious.
Claims (1)
1. A method for power amplification by mixing analog predistortion with in-band digital predistortion, comprising the steps of:
(1) Connecting a signal output port of the vector signal generator with a signal input port of the millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of the attenuator, and connecting a signal output port of the attenuator with a signal input port of the spectrum analyzer;
(2) Starting a vector signal generator, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, firstly selecting a 5GNR signal in the vector signal generator for output, then setting the frequency parameter of the spectrum analyzer as the working center frequency of the millimeter wave radio frequency power amplifier, setting the bandwidth parameter of the spectrum analyzer as the bandwidth of the 5GNR signal, and at the moment, generating a curve graph on the spectrum analyzer, wherein the curve graph comprises a first curve, the first curve is the nonlinear power spectrum of the millimeter wave radio frequency power amplifier, and locking the first curve by utilizing the function of locking the curve of the spectrum analyzer;
(3) Disconnecting the connection between the signal input port of the millimeter wave radio frequency power amplifier and the signal output port of the vector signal generator;
(4) Connecting a signal output port of a vector signal generator with a signal input port of an analog predistorter, connecting a signal output port of the analog predistorter with a signal input port of a driving power amplifier, connecting a signal output port of the driving power amplifier with a signal input port of a millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of an attenuator, connecting a signal output port of the attenuator with a signal input port of a low-pass filter, and connecting a signal input port of the low-pass filter with a signal input port of a spectrum analyzer;
(5) Starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, selecting a 5GNR signal in the vector signal generator for output, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as a bandwidth of the 5GNR signal, and generating a graph on the spectrum analyzer, wherein the graph comprises two curves, one curve is a first curve locked in the step (2), the other curve is a newly added curve, the magnitude of signal power is adjusted in the vector signal generator, so that a peak value of the newly added curve is adjusted to be at the same position as a peak value of the first curve, a second curve is obtained, the second curve is locked by utilizing a locking curve function of the spectrum analyzer, and the second curve is a linearized power spectrum of the millimeter wave radio frequency power amplifier after analog predistortion;
(6) Disconnecting the signal output port of the vector signal generator from the signal input port of the analog predistorter, disconnecting the signal output port of the analog predistorter from the signal input port of the driving power amplifier, disconnecting the signal output port of the driving power amplifier from the signal input port of the millimeter wave radio frequency power amplifier, disconnecting the signal output port of the millimeter wave radio frequency power amplifier from the signal input port of the attenuator, and disconnecting the signal output port of the attenuator from the signal input port of the spectrum analyzer;
(7) Acquiring in-band signal data, namely corresponding data on a second curve, by utilizing a data acquisition function of a spectrum analyzer, storing the acquired data as an iq.tar file, namely an analog predistortion file, performing format conversion on the analog predistortion file on a computer by using an R & S ARB Toolbox, converting the analog predistortion file into a file with the suffix of. Txt or. Csv, and referring the file as a first conversion file;
(8) Importing a first conversion file into a matlab, processing the first conversion file by using an MP model to obtain a file with a suffix name of. Txt, namely a second conversion file, and carrying out format conversion on the second conversion file by using an R & S ARB Toolbox to obtain a file with a suffix name of. Wv format, namely a digital predistortion file;
(9) Connecting a signal output port of a vector signal generator with a signal input port of an analog predistorter, connecting a signal output port of the analog predistorter with a signal input port of a driving power amplifier, connecting a signal output port of the driving power amplifier with a signal input port of a millimeter wave radio frequency power amplifier, connecting a signal output port of the millimeter wave radio frequency power amplifier with a signal input port of an attenuator, and connecting a signal output port of the attenuator with a signal input port of a spectrum analyzer;
(10) The method comprises the steps of starting a vector signal generator, an analog predistorter, a driving power amplifier, a millimeter wave radio frequency power amplifier, an attenuator and a spectrum analyzer, guiding a digital predistortion file into the vector signal generator, selecting a digital predistortion file for output in the vector signal generator, acquiring a bandwidth corresponding to the digital predistortion file at the position of the vector signal generator, setting a frequency parameter of the spectrum analyzer as a working center frequency of the millimeter wave radio frequency power amplifier, setting a bandwidth parameter of the spectrum analyzer as the bandwidth corresponding to the digital predistortion file, and at the moment, generating a graph on the spectrum analyzer, wherein the graph comprises three curves, namely the first curve locked in the step (2), the second curve locked in the step (5) and a new curve, adjusting the signal power in the vector signal generator, enabling the peak value of the new curve to be positioned at the same position as the peak value of the first curve, and obtaining a third curve, locking the third curve by utilizing a locking curve function of the spectrum analyzer, namely the millimeter wave radio frequency power amplifier, and completing the linearization of the millimeter wave radio frequency power amplifier after analog predistortion and digital predistortion.
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| CN102751950A (en) * | 2012-06-29 | 2012-10-24 | 宁波大学 | Digital predistortion method of multirange multimode radio frequency power amplifier |
| WO2016074218A1 (en) * | 2014-11-14 | 2016-05-19 | 华为技术有限公司 | Analog predistorter core module and analog predistorter system |
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