CN102163956B - Signal feedback loop and method for predistorter, power amplification equipment - Google Patents
Signal feedback loop and method for predistorter, power amplification equipment Download PDFInfo
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- CN102163956B CN102163956B CN201010114863.3A CN201010114863A CN102163956B CN 102163956 B CN102163956 B CN 102163956B CN 201010114863 A CN201010114863 A CN 201010114863A CN 102163956 B CN102163956 B CN 102163956B
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Abstract
The invention discloses a signal feedback loop and a method for predistorter, and power amplification equipment. The signal feedback loop comprises: a down converter for converting feedback signals downward into baseband signals or intermediate frequency signals, a first filer for filtering the baseband signals or the intermediate frequency signals to preliminarily inhibit main band signals among the signals, thereby outputting first filtering signals, an analog-to-digital converter for converting first filtering signals into digital signals from analog signals, a second filer for filtering digital signals to further inhibit the main band signals among the signals, thereby outputting second filtering signals, a power calculator for calculating the out-of-band power of the feedback signals according to the second filtering signals; and a coefficient updating controller for updating the coefficient of the predistorter according to the out-of-band power. With the technology scheme of the invention, the dynamic scope requirement of analog-to-digital conversion and the complexity of simulation circuits can be reduced by shifting part of the simulation loop complexity to digital field and utilizing two-level filtering structure.
Description
Technical field
The present invention relates to the especially digital pre-distortion linearization technology of power amplifier of nonlinear device, particularly a kind of signal feedback loop for the power amplifier pre-distortion device and method.
Background technology
Power amplifier is as the core component in analog communication system, and the high efficiency design in other words of its low power dissipation design is a hot issue always.The distortion information that the utilization of digital baseband pre-distortion method feeds back, sending digital end pre-compensation amplifier nonlinearity characteristic, and the nonlinear compensation than being easier to realize self adaptation and high bandwidth, become one of first-selection of pre-distortion method.
According to the type of feedback information, predistorter can be divided into to vector method and scalar method.
So-called vector method is that the amplitude of the distorted signal by amplifier and phase information are retained fully, by with not through the primary signal time delay of amplifier align do poor, the generated error signal.Using error signal as cost function, adopt adaptive algorithm to generate the predistorter coefficient.This method is high to the linearity of feedback loop, the feedback loop more complicated.
The scalar rule is that the signal through amplifier is processed, and inside and outside out-of-band power or band, power ratio, as cost function, also can adopt adaptive algorithm, or selects one as the predistorter coefficient in a plurality of fixed tables.This method does not need quadrature demodulation, and feedback loop is simple than vector method, but convergence rate may be slower.
The inventor has the scalar method predistorter by investigation, finds that still there is the problem that analog feedback loop is complicated, analog-to-digital conversion speed is high in the feedback loop of current scalar method predistorter.
For example, Fig. 1 and 2 shows respectively the known structure of the feedback loop for the scalar method predistorter at present.
As shown in Figure 1, power amplification device 100 comprises predistorter 101, digital to analog converter (DA) 102, upconverter 103, power amplifier 104, coupler 105, low-converter 106, band pass filter (BPF) 107, power calculator 108, low pass filter (LPF) 109, analog to digital converter (AD) 110 and coefficient updating controller 111, wherein low-converter 106, BPF 107, power calculator 108, LPF 109, AD 110 and coefficient updating controller 111, consists of the feedback loop of predistorter 101.
In the feedback loop shown in Fig. 1, the analog circuit device is many, in addition to rejection in the band of BPF 107 strict (such as requiring 60dB in inhibition zone), as shown in Fig. 3 (a).The analog filter that so just needs high-order, have the shortcoming that circuit scale is large.
In addition, as shown in Figure 2, power amplification device 200 comprises predistorter 101, digital to analog converter (DA) 102, upconverter 103, power amplifier 104, coupler 105, low-converter 106, analog to digital converter (AD) 201, Fourier transformation unit (FFT) 202, power calculator 203 and coefficient updating controller 111, wherein low-converter 106, AD 201, FFT 202, power calculator 203 and coefficient updating controller 111, consists of the feedback loop of predistorter 101.Except AD 201, FFT 202, power calculator 203, remaining unit is identical with the function of the corresponding units shown in Fig. 1 respectively, and means with identical Reference numeral, at this, omits its detailed description.
In the feedback loop shown in Fig. 2, out-of-band power is calculated and moves to numeric field, wherein AD 201 can carry out analog-to-digital conversion for low-converter 106 is carried out to the resulting baseband signal of down-conversion, FFT 202 can carry out Fourier transform by AD 201 is carried out to the resulting digital signal of analog-to-digital conversion, thereby obtains signal spectrum.Power calculator 203 can calculate out-of-band power for the signal spectrum according to from FFT 202 outputs.Although this scheme analogue device is few, to having relatively high expectations of AD, as shown in Fig. 3 (b).Dynamic range (if consideration 60dB to AD, the AD that at least needs effective number of bits (ENOB)=10 bit) and sampling rate (if consider 5 subharmonic distortions, need 5 times on adopt speed) all have high requirements, such AD often involves great expense, and the clock rate of numeric field is high simultaneously.
Summary of the invention
Provided hereinafter about brief overview of the present invention, in order to the basic comprehension about some aspect of the present invention is provided.But, should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is used for determining key part of the present invention or pith, neither be intended to for limiting scope of the present invention.Its purpose is only that the form of simplifying provides about some concept of the present invention, usings this as the preorder in greater detail provided after a while.
Said circumstances in view of prior art, the power amplification device that the purpose of this invention is to provide a kind of signal feedback loop for the power amplifier pre-distortion device and method and comprise this signal feedback loop, it can solve one or more in the prior art problem.
To achieve these goals, according to an aspect of the present invention, a kind of signal feedback loop for the power amplifier pre-distortion device is provided, and it comprises: low-converter, for down-converting to baseband signal or intermediate-freuqncy signal from the feedback signal of power amplifier output; The first filter, carry out the first filtering for low-converter being carried out to the resulting baseband signal of down-conversion or intermediate-freuqncy signal, tentatively suppresses with the master tape signal to wherein, thereby export the first filtering signal; Analog to digital converter, carry out analog-to-digital conversion for the first filtering signal to from the first filter output; The second filter, carry out the second filtering for analog to digital converter being carried out to the resulting digital signal of analog-to-digital conversion, further suppresses with the master tape signal to wherein, thereby export the second filtering signal; Power calculator, for the second filtering signal according to from the second filter output, calculate the out-of-band power of feedback signal; And coefficient updating controller, for the out-of-band power according to being calculated by power calculator, upgrade the coefficient of predistorter.
Preferably, analog to digital converter carries out the low speed sampling to the first filtering signal, makes n above harmonic wave partly or entirely superpose, and wherein n is more than or equal to 3 odd number.
According to a further aspect in the invention, also provide a kind of method of the signal feedback for the power amplifier pre-distortion device, comprised the following steps: will down-convert to baseband signal or intermediate-freuqncy signal from the feedback signal of power amplifier output; To through the resulting baseband signal of down-conversion or intermediate-freuqncy signal, carrying out the first filtering, tentatively suppress with the master tape signal to wherein, thereby export the first filtering signal; The first filtering signal is carried out to analog-to-digital conversion; To through the resulting digital signal of analog-to-digital conversion, carrying out the second filtering, further suppress with the master tape signal to wherein, thereby export the second filtering signal; According to the second filtering signal, calculate the out-of-band power of feedback signal; And, according to the out-of-band power of calculating, upgrade the coefficient of predistorter.
Preferably, the first filtering signal is carried out to analog-to-digital conversion and comprise the first filtering signal is carried out to the low speed sampling, make n above harmonic wave partly or entirely superpose, wherein n is more than or equal to 3 odd number.
According to a further aspect in the invention, also provide a kind of power amplification device, it comprises: predistorter, and for input signal is carried out to predistortion, the output pre-distorted signals; Digital to analog converter, be converted to analog baseband signal for the pre-distorted signals that predistorter is exported; Upconverter, for up-converting to radiofrequency signal from the analog baseband signal of digital to analog converter output; Power amplifier, carry out the output signal after power amplification power output are amplified for the radiofrequency signal to upconverter output; Coupler, be two paths of signals for the output branch by power amplifier, and a road signal sends via antenna as output signal, and another road signal is input in signal feedback loop as above as feedback signal; And signal feedback loop as above.
According to a further aspect in the invention, also provide for realizing the computer program of above-mentioned signal feedback method.
According to a further aspect in the invention, also provide computer-readable medium, recorded on it for realizing the computer program code of signal feedback method.
According to technique scheme of the present invention, by partial simulation loop complexity having been transferred to the method for numeric field and utilized the secondary filter Structure Decreasing analog-to-digital dynamic range requirement, greatly reduce the analog circuit complexity.In addition, the spectral aliasing that utilizes low speed AD to produce, greatly reduce the rate request to AD in the situation that do not affect performance.In the situation that performance does not worsen, further reduced the cost of feedback loop.
The accompanying drawing explanation
The present invention can, by reference to given detailed description and being better understood by reference to the accompanying drawings hereinafter, wherein use same or analogous Reference numeral to mean identical or similar parts in institute's drawings attached.Described accompanying drawing comprises in this manual and forms the part of specification together with following detailed description, be used for further illustrating the preferred embodiments of the present invention and explain principle and advantage of the present invention.In the accompanying drawings:
Fig. 1 shows the structured flowchart of the power amplification device of prior art and signal feedback loop wherein;
Fig. 2 shows the structured flowchart of the power amplification device of another prior art and signal feedback loop wherein;
Fig. 3 (a) schematically shows in the technical scheme of Fig. 1 the requirement to BPF;
Fig. 3 (b) schematically shows in the technical scheme of Fig. 2 the requirement to AD;
Fig. 4 shows the structured flowchart according to the power amplification device of the embodiment of the present invention and signal feedback loop wherein;
Fig. 5 (a) shows analog signal frequency spectrum s (f);
Fig. 5 (b) shows the frequency spectrum (sampling rate>signal bandwidth) after sampling;
Fig. 5 (c) shows the frequency spectrum (sampling rate<signal bandwidth) after sampling;
Fig. 6 shows the exemplary digital intermediate frequency embodiment according to the embodiment of the present invention;
Fig. 7 shows the exemplary zero intermediate frequency embodiment according to the embodiment of the present invention; And
Fig. 8 shows the flow chart according to the method for the signal feedback for the power amplifier pre-distortion device of the embodiment of the present invention.
It will be appreciated by those skilled in the art that element in accompanying drawing only for simple and clear for the purpose of and illustrate, and not necessarily draw in proportion.For example, in accompanying drawing, the size of some element may have been amplified with respect to other element, in order to contribute to improve the understanding to the embodiment of the present invention.
Embodiment
In connection with accompanying drawing, example embodiment of the present invention is described hereinafter.All features of actual execution mode are not described for clarity and conciseness, in specification.Yet, should understand, must make a lot of decisions specific to execution mode in the process of any this practical embodiments of exploitation, in order to realize developer's objectives, for example, meet those restrictive conditions with system and traffic aided, and these restrictive conditions may change to some extent along with the difference of execution mode.In addition, although will also be appreciated that development is likely very complicated and time-consuming, concerning the those skilled in the art that have benefited from present disclosure, this development is only routine task.
At this, what also need explanation is a bit, for fear of the details because of unnecessary fuzzy the present invention, only show in the accompanying drawings with according to the closely-related apparatus structure of the solution of the present invention and/or treatment step, and omitted other details little with relation of the present invention.
Describe in detail with reference to the accompanying drawings according to the power amplification device of the embodiment of the present invention and signal feedback loop wherein.
Fig. 4 shows according to the power amplification device 400 of the embodiment of the present invention and the structured flowchart of signal feedback loop wherein.
As shown in Figure 4, power amplification device 400 comprises predistorter 101, digital to analog converter (DA) 102, upconverter 103, power amplifier 104, coupler 105, low-converter 106, the first filter 401, AD 402, the second filter 403, power calculator 404 and coefficient updating controller 111, wherein low-converter 106, the first filter 401, AD 402, the second filter 403, power calculator 404 and coefficient updating controller 111, consists of the feedback loop of predistorter 101.Except the first filter 401, AD 402, the second filter 403, power calculator 404, remaining unit is identical with the function of the corresponding units shown in Fig. 1 and 2 respectively, and means with identical Reference numeral, at this, omits its detailed description.
The first filter 401 can be for carrying out the resulting baseband signal of down-conversion to low-converter 106 or intermediate-freuqncy signal is carried out the first filtering, tentatively suppress (such as suppressing master tape signal 25dB) with the master tape signal to wherein, thereby export the first filtering signal, can reduce like this dynamic range requirement of AD 402.AD 402 can carry out analog-to-digital conversion for the first filtering signal to from the first filter 401 outputs.The second filter 403 can carry out the second filtering for AD 402 is carried out to the resulting digital signal of analog-to-digital conversion, further suppresses (such as suppressing master tape signal 35dB) with the master tape signal to wherein again, thereby exports the second filtering signal.Power calculator 404 can, for the second filtering signal according to from the second filter 403 outputs, calculate the out-of-band power of feedback signal.Because the first filter 401 just tentatively suppresses the master tape signal, to the master tape signal suppressing, than less demanding, the first filter 401 circuit scales are less.After the dynamic range of AD reduces, the bit number of AD can reduce greatly.
Preferably, AD 402 can carry out the low speed sampling to the first filtering signal, makes n above harmonic wave partly or entirely superpose, and wherein n is more than or equal to 3 odd number.Like this, the sampling rate of AD can reduce greatly.
For ease of understanding, first review is sampling thheorem once:
If analog signal (t), its corresponding frequency spectrum is X (f).If AD obtains signal after sampling with sample frequency fs
, its corresponding frequency spectrum is
.Its corresponding frequency spectrum is:
therefore the frequency spectrum of original analog has obtained periodic continuation with interval fs.When the relation of sample frequency fs and signal bandwidth X is different, the continuation situation difference of frequency spectrum, as shown in Fig. 5 (a)～(c).The present invention has utilized the situation of Fig. 5 (c), makes the inferior above harmonic wave of n (n is more than or equal to 3 odd number) of signal in sampling stack in whole or in part afterwards, and then calculates its power.
Only consider 5 subharmonic in following legend, yet, it will be clear to one skilled in the art that for considering that the harmonic distortion more than 3 times is still applicable.
Fig. 6 has provided 2 solution examples of digital intermediate frequency mode:
For digital intermediate frequency mode, low-converter 106 consists of frequency mixer 601 usually.
First example adopts digital intermediate frequency fif=2.5X.Adopt band stop filter that the master tape signal is tentatively suppressed, after then adopting the AD sampled signal of 2.5X, make 5 times and 3 subharmonic carry out partial stack, finally the high pass filter at numeric field employing cut-off frequency fc=X/2 leaches distorted signal.Calculate after its power as cost function.
Another example adopts digital intermediate frequency fif=1.5X.Adopt band stop filter that the master tape signal is tentatively suppressed, after then adopting the AD sampled signal of 3X, make 5 times and 3 subharmonic carry out partial stack, finally the high pass filter at numeric field employing cut-off frequency fc=X leaches 3 order harmonic signal.Calculate after its power as cost function.
Emulation shows originally to use the AD of the ENOB=10bit adopted on 5X, adopts the solution in Fig. 7 to use 2.5X/1.5X, and the AD of ENOB=4bit can obtain almost identical performance.
Fig. 7 has provided 2 solution examples of zero intermediate frequency mode:
For the zero intermediate frequency mode, low-converter 106 consists of quadrature demodulator 701 usually, to obtain I/Q two paths of signals information.Quadrature demodulator 701 is compared more complicated with frequency mixer, two-way frequency mixer cos (2 π f t)/sin (2 π f t), consist of.
First example adopts band stop filter that the master tape signal is tentatively suppressed, and after then adopting the AD sampled signal of 2.5X, makes 5 times and 3 subharmonic carry out partial stack, and finally the high pass filter at numeric field employing cut-off frequency fc=X/2 leaches distorted signal.Calculate after its power as cost function.
Second example adopts band stop filter that the master tape signal is tentatively suppressed, and after then adopting the AD sampled signal of 1.5X, then adopts the high pass filter of cut-off frequency fc=X/2 to leach 3 rd harmonic signal.Calculate after its power as cost function.
The above describes in detail by reference to the accompanying drawings according to the power amplification device of the embodiment of the present invention and signal feedback loop wherein.Below in conjunction with accompanying drawing, the method for the signal feedback for the power amplifier pre-distortion device according to the embodiment of the present invention is described.
Fig. 8 shows the flow chart according to the method for the signal feedback for the power amplifier pre-distortion device of the embodiment of the present invention.
As shown in Figure 8, at first, at step S801, will down-convert to baseband signal or intermediate-freuqncy signal from the feedback signal of power amplifier output.
Next, at step S802, to through the resulting baseband signal of down-conversion or intermediate-freuqncy signal, carrying out the first filtering, tentatively suppress with the master tape signal to wherein, thereby export the first filtering signal.
Next, at step S803, the first filtering signal is carried out to analog-to-digital conversion.
Next, at step S804, to through the resulting digital signal of analog-to-digital conversion, carrying out the second filtering, further suppress with the master tape signal to wherein, thereby export the second filtering signal.
Next, at step S805, according to the second filtering signal, calculate the out-of-band power of feedback signal.
Finally, at step S806, according to the out-of-band power of calculating at step S805, upgrade the coefficient of predistorter.
Preferably, the analog-to-digital conversion process of step S803 comprises carries out the low speed sampling to the first filtering signal, makes n above harmonic wave partly or entirely superpose, and wherein n is more than or equal to 3 odd number.
Detailed description had been made in the optional execution mode of other of the above-mentioned steps of the method front, was not repeated.
In addition, obviously, according to each operating process of said method of the present invention, also can realize in the mode that is stored in the computer executable program in various machine-readable storage mediums.
And, purpose of the present invention also can realize by following manner: the storage medium that will store above-mentioned executable program code offers system or equipment directly or indirectly, and the said procedure code is read and carried out to the computer in this system or equipment or CPU (CPU).Now, as long as this system or equipment have the function of executive program, embodiments of the present invention are not limited to program, and this program can be also form arbitrarily, for example, the program that target program, interpreter are carried out or the shell script that offers operating system etc.
Above-mentioned these machinable mediums include but not limited to: various memories and memory cell, and semiconductor equipment, disk cell is light, magnetic and magneto optical disk for example, and other is suitable for the medium of the information of storing etc.
In addition, computer is by being connected to the corresponding website on the internet, and will download and be installed in computer this program of then carrying out according to computer program code of the present invention, also can realize the present invention.
In apparatus and method of the present invention, obviously, each parts or each step can decompose and/or reconfigure.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.And, carry out the step of above-mentioned series of processes and can order naturally following the instructions carry out in chronological order, but do not need necessarily to carry out according to time sequencing.Some step can walk abreast or carry out independently of one another.
Describe by reference to the accompanying drawings embodiments of the invention in detail although above, it should be understood that execution mode described above is just for the present invention is described, and be not construed as limiting the invention.For a person skilled in the art, can make various changes and modifications and not deviate from the spirit and scope of the invention above-mentioned execution mode.Therefore, scope of the present invention is only limited by appended claim and equivalents thereof.
Claims (7)
1. the signal feedback loop for the power amplifier pre-distortion device comprises:
Low-converter, for down-converting to baseband signal or intermediate-freuqncy signal from the feedback signal of power amplifier output;
The first filter, carry out the first filtering for low-converter being carried out to the resulting baseband signal of down-conversion or intermediate-freuqncy signal, tentatively suppresses with the master tape signal to wherein, thereby export the first filtering signal;
Analog to digital converter, carry out analog-to-digital conversion for the first filtering signal to from the first filter output;
The second filter, carry out the second filtering for analog to digital converter being carried out to the resulting digital signal of analog-to-digital conversion, further suppresses with the master tape signal to wherein, thereby export the second filtering signal;
Power calculator, for the second filtering signal according to from the second filter output, calculate the out-of-band power of feedback signal; And
Coefficient updating controller, for the out-of-band power according to being calculated by power calculator, upgrade the coefficient of predistorter.
2. signal feedback loop as claimed in claim 1, wherein analog to digital converter carries out the low speed sampling to the first filtering signal, makes n above harmonic wave partly or entirely superpose, and wherein n is more than or equal to 3 odd number.
3. signal feedback loop as claimed in claim 1, wherein, under digital intermediate frequency mode, low-converter consists of frequency mixer.
4. signal feedback loop as claimed in claim 1, wherein, under the zero intermediate frequency mode, low-converter consists of quadrature demodulator.
5. the method for the signal feedback for the power amplifier pre-distortion device comprises the following steps:
To down-convert to baseband signal or intermediate-freuqncy signal from the feedback signal of power amplifier output;
To through the resulting baseband signal of down-conversion or intermediate-freuqncy signal, carrying out the first filtering, tentatively suppress with the master tape signal to wherein, thereby export the first filtering signal;
The first filtering signal is carried out to analog-to-digital conversion;
To through the resulting digital signal of analog-to-digital conversion, carrying out the second filtering, further suppress with the master tape signal to wherein, thereby export the second filtering signal;
According to the second filtering signal, calculate the out-of-band power of feedback signal; And
According to the out-of-band power of calculating, upgrade the coefficient of predistorter.
6. signal feedback method as claimed in claim 5, wherein carry out analog-to-digital conversion to the first filtering signal and comprise the first filtering signal is carried out to the low speed sampling, and make n above harmonic wave partly or entirely superpose, wherein n is more than or equal to 3 odd number.
7. a power amplification device comprises:
Predistorter, for input signal is carried out to predistortion, the output pre-distorted signals;
Digital to analog converter, be converted to analog baseband signal for the pre-distorted signals that predistorter is exported;
Upconverter, for up-converting to radiofrequency signal from the analog baseband signal of digital to analog converter output;
Power amplifier, carry out the output signal after power amplification power output are amplified for the radiofrequency signal to upconverter output;
Coupler, be two paths of signals for the output branch by power amplifier, and a road signal sends via antenna as output signal, and another road signal is input in signal feedback loop as described as any one in claim 1-4 as feedback signal; And
Signal feedback loop as described as any one in claim 1-4.
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| CN103581082B (en) * | 2012-07-31 | 2016-10-05 | 富士通株式会社 | The coefficient updating device of base band predistortion and method, pre-distortion arrangement and emitter |
| US8824980B2 (en) * | 2012-09-05 | 2014-09-02 | Analog Devices, Inc. | System and method to implement a radio transmitter with digital predistortion having reduced noise |
| CN103780206A (en) * | 2012-10-24 | 2014-05-07 | 华为技术有限公司 | Feedback link and implementation method thereof |
| CN103107967B (en) * | 2013-01-25 | 2016-02-03 | 大唐移动通信设备有限公司 | A kind of update method of pre-distortion coefficients and system |
| CN105531925B (en) * | 2013-05-20 | 2018-10-23 | 美国亚德诺半导体公司 | Digitization system linearizes |
| CN104468437B (en) * | 2013-09-12 | 2017-11-14 | 富士通株式会社 | Digital predistortion transmitter and its control method |
| CN106537862A (en) * | 2014-04-30 | 2017-03-22 | 华为技术有限公司 | Pre-distortion system and method |
| CN104486273B (en) * | 2014-12-11 | 2018-01-09 | 中国传媒大学 | A kind of adaptive direct orthogonalization Frequency-variable Modulation error calibration method |
| CN116436539B (en) * | 2023-06-15 | 2023-10-03 | 中星联华科技（北京）有限公司 | Nonlinear calibration device and method for amplifier |
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| CN1954490A (en) * | 2004-05-19 | 2007-04-25 | 艾利森电话股份有限公司 | Adaptive predistortion method and device |
| CN101184070A (en) * | 2007-12-07 | 2008-05-21 | 北京北方烽火科技有限公司 | Hundred mega broadband digital predistortion power amplifier device and method |
| CN101420236A (en) * | 2007-10-24 | 2009-04-29 | 松下电器产业株式会社 | Local oscillation leakage detection and elimination apparatus and method |
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| CN1954490A (en) * | 2004-05-19 | 2007-04-25 | 艾利森电话股份有限公司 | Adaptive predistortion method and device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 Termination date: 20210224 |