CN104219182B - RF power amplification linearized system based on wideband modulator - Google Patents
RF power amplification linearized system based on wideband modulator Download PDFInfo
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Abstract
The present invention relates to a kind of RF power amplification linearized system based on wideband modulator, including reception device, channel and emitter, emitter comprises at least Test data generation device, pre-distortion device, modulating device and power amplification device；Reception device comprises at least synchronous demodulation device, recovers data set, pre-distortion parameters computing device.In pre-distortion parameters computing device, pre-distortion coefficients vector A is calculated using improved New variable step-size LMS, then pre-distortion device is configured with obtained coefficient.After transmission signal matrix U is by pre-distortion device, i.e., obtain pre-distortion device output vector Z by calculating Z=UA；The present invention is not on the basis of original LMS algorithm is changed, replace step-length by refining piecewise interval, the step factor in modified LMS algorithm, can make it is predistorted after Out-of-band rejection improve about 3dB, closer optimal coefficient, improve the nonlinear compensation effect of predistortion.
Description
Technical field
The present invention relates to a kind of RF power amplification linearized system, more particularly to a kind of RF power amplification based on wideband modulator
Linearized system.
Background technology
According to domestic and international remote sensing satellite and the present situation and development trend of various payload technologies, what spacecraft product obtained
The growth that information content and data volume are advanced by leaps and bounds, it is particularly urgent to the demand of with improving star transmission rate.In order to meet following star
The requirement of ground high speed data transfer, the technological progress of China's satellite system and ground system is effectively promoted, expand earth observation and defend
The application field of star, solves the problems, such as broadband signal frequency resource anxiety, the wide-band modulation number for studying operating factor of highband is taught skill
Art is significant.
In the high-speed digital transmission system of high order modulation, using high-order modulating, such as 16QAM, 32APSK, there is non-perseverance
Determine the characteristic of envelope modulation, the linearization technique of spaceborne travelling-wave tubes power amplifier (TWTA) or solid state power amplifier (SSPA) is spaceborne broadband number
Pass the key technology bottleneck of research.The non-linear influence to caused by high order modulation signal of channel, as spread spectrum, planisphere are turned round
Bent, generation Nonlinear intersymbol interference etc., seriously reduce the performance of high speed data transmission system.In order to tackle above challenge, disappear
Except in channel nonlinear device (power amplifier, travelling-wave tube amplifier etc.) to caused by signal non-linear distortion, it is necessary to be directed to
Passage designs pre-distortion compensated algorithm.According to the actual measurement index of nonlinear device, specifically include：AM/AM, AM/PM, three ranks are handed over
The features such as tune, Adjacent Channel Power Ratio.
Traditional power amplifier predistortion scheme uses the homologous method of sending and receiving, transmitting-receiving is reached synchronous with identical local oscillation signal source.
But (such as satellite system of sending and receiving separation) is unsuitable for using the homologous method of sending and receiving in some cases.
And traditional LMS algorithm is proposed based on least-mean-square error algorithm and steepest descent method, aiming at makes pre- mistake
True device output and the assembly average E { e of the square-error of desired signal2(n) it is } minimum, according to the statistics of a kind of data of input
Characteristic seeks optimum performance.By studying influence of the step-length to LMS algorithm after being emulated to LMS algorithm, it was found that even in
After iteration convergence, influence of the different pre-distortion coefficients organized to system still has larger gap, and this explanation is for asking optimal pre-
The algorithm of distortion factor is stable not enough.
The content of the invention
It is an object of the invention to provide a kind of RF power amplification linearized system based on wideband modulator, solves pre- mistake
The problem of really nonlinear compensation parameter is complicated and ineffective.
In order to solve the above problems, the present invention relates to a kind of RF power amplification linearized system based on wideband modulator,
Including reception device, channel and emitter, the emitter comprises at least：
Test data generation device, generate test signal sequence and transmitting sequence；
Pre-distortion device, test signal sequence and transmitting sequence are received, receive some test signal sequences or transmitting sequence
The matrix U of composition is arranged, i.e., obtains pre-distortion device output vector Z by calculating Z=UA；
Modulating device, pre-distortion device output vector Z is modulated, exports modulated signal；And power amplification device, to institute
State modulated signal and carry out power amplification, and the signal after power amplification is launched by channel；
Comprised at least in the reception device:
Synchronous demodulation device, an intermediate-freuqncy signal is obtained to the radiofrequency signal down coversion received, and to the intermediate-freuqncy signal
Carrier synchronization is carried out, and is demodulated according to modulation system；
Recover data set, linear equalization calculating and hard decision are carried out to the signal after sychronisation processing, obtained extensive
Complex signal；
Pre-distortion parameters computing device, set a predistortion model, and the variable step μ (n) and profit of its self-defined LMS algorithm
The pre-distortion coefficients vector A obtained with improved New variable step-size LMS configures to pre-distortion device；Wherein variable step μ (n)
Update mode be
Wherein n is iterative steps, λmaxFor the eigenvalue of maximum of the autocorrelation matrix of list entries, a, b are constant, and
stepoptThe optimum stepsize of optimum coefficient is obtained to update coefficient vector to test data by LMS algorithm, 0<a<stepopt<b<
2；Total is the iteration total step number for updating coefficient vector to test data by LMS algorithm, and c, d are constant, makes the recovery letter
Number and the difference of corresponding test signal sequence be less than predetermined threshold value.
It is preferred that U is l × m of m groups test signal sequence composition matrix, wherein l is the element of every group of signal sequence
Number, m=K × Q, K and Q represent the exponent number and memory depth of predistortion model nonlinear polynomial respectively.
It is preferred that the sychronisation, which includes phaselocked loop and relevant peaks, searches device, by the phaselocked loop and
Relevant peaks, which search device, makes the carrier phase for making the intermediate-freuqncy signal reach synchronous.
It is preferred that a be less than 2 and close to 2 constant, b be more than 0 and close to 0 constant.
It is preferred that the predistortion model is：
Wherein, x (n) is the test data of input, and z (n) is output signal, and K and Q are respectively the exponent number of nonlinear polynomial
And memory depth, akqFor model coefficient.
It is preferred that in LMS algorithm, coefficient vector A=w is initializedm(0)=0, the more new formula of coefficient vector is w (n+1)
=w (n)+μ (n) e (n) U (n), wherein e (n) are the difference after the predistortion after nth iteration between output signal and desired signal
Value, U (n) are the signal matrix for inputting predistortion.
It is preferred that wherein 0<c<=0.5<d<1.
The present invention is due to using above technical scheme, compared with prior art, have the following advantages that and good effect：
1) present invention replaces step-length by refining piecewise interval, corrects LMS on the basis of original LMS algorithm is not changed
Step factor in algorithm, can make it is predistorted after Out-of-band rejection improve about 3dB, closer to optimal coefficient, and predistortion pair
Pre-distortion coefficients vector A chooses more sensitivity, therefore the present invention improves the nonlinear compensation effect of predistortion；
2) broadband phase-looked loop and relevant peaks technology are used, can not be homologous in sending and receiving such as the satellite systems of such as sending and receiving separation
In the case of still can realize reception device and the direct sending and receiving synchronizing information of dispensing device.
Brief description of the drawings
Fig. 1 is a kind of system block diagram of the RF power amplification linearized system based on wideband modulator in the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention,
Obviously, as described herein is only a part of example of the invention, is not whole examples, based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all belongs to
In protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, make further by taking specific embodiment as an example below in conjunction with accompanying drawing
Illustrate, and each embodiment does not form the restriction to the embodiment of the present invention.
A kind of RF power amplification linearized system based on wideband modulator, including reception device 1, channel 2 and emitter
3, emitter comprises at least Test data generation device, pre-distortion device, modulating device and power amplification device；Reception device is extremely
Include synchronous demodulation device less, recover data set, pre-distortion parameters computing device.
Existing synchronous method is can give modulating device and demodulating equipment provide identical local oscillator using local oscillation device
Signal, it is possible to achieve reception device and the direct sending and receiving synchronizing information of dispensing device.
Because spaceborne broadband high-speed receives, demodulated equipment is more complicated, and demodulation at a high speed is not suitable for spacecraft use, Zhi Neng
Ground is realized, it is difficult to accomplish that sending and receiving are homologous.The present invention is provided with phaselocked loop in synchronous demodulation device and relevant peaks search dress
Put, the signal for making intermediate-freuqncy signal launch with power amplification device by phaselocked loop and relevant peaks lookup device is synchronous, passes through this side
Formula, such as sending and receiving separation the sending and receiving such as satellite system can not it is homologous in the case of still can realize that reception device fills with sending
Direct sending and receiving synchronizing information is put, as shown in Figure 1.
Test data generation device, generate test signal sequence and transmitting sequence.
Pre-distortion device, test signal sequence and transmitting sequence are received, receive transmission signal matrix U, i.e., by calculating Z
It is the matrix that some test signal sequences or transmitting sequence form that=UA, which obtains pre-distortion device output vector Z, wherein U,.
Modulating device, pre-distortion device output vector Z is modulated, exports modulated signal.
Power amplification device, power amplification is carried out to modulated signal, and the signal after power amplification is launched by channel.
It will be filtered as power amplifier is latter by bandpass filter, so the frequency spectrum Out-of-band rejection feelings of signal bandwidth distal end
Condition is without considering, the spectral characteristic in 3 times of bandwidth of Main Analysis near-end of the present invention.Transmission power amplified signal in power amplification device
Device is generally radio-frequency antenna.
Channel is the transmission medium of signal, can be divided into wire message way and the class of wireless channel two.Wire message way includes open-wire line, right
Claim cable, coaxial cable and optical cable etc..Wireless channel has in the propagation of ground wave, shortwave ionospheric reflection, ultrashort wave or microwave sighting distance
After, artificial satellite relaying and various scatter channels etc..The linear distortion of channel has been divided according to the device property of radio-frequency channel
Area and non-linear distortion area.The wideband digital predistortion algorithm compensation that scheme proposes is as caused by amplifier, travelling-wave tubes power amplifier etc.
There is nonlinear distortion with memory.Channel simulation data transmission channel, addition amplitude distortion, group delay distortion, and caused by TWTA
AM/PM effects and third order intermodulation effect, finally add white Gaussian noise；In fact also can in reception device and emitter
Linear distortion and non-linear distortion are introduced due to some undesirable factors, is established in emulation in model and uniformly puts these distortions
Added in channel between reception device and emitter.
Reception device includes：Synchronous demodulation device, the signal in channel is received, and obtained to receiving signal down coversion
One intermediate-freuqncy signal, and carrier synchronization is carried out to the intermediate-freuqncy signal, and be demodulated according to modulation system；
Recover data set, linear equalization calculating and hard decision are carried out to the signal after the processing of synchronous demodulation device, obtained
To recovery signal；
Pre-distortion parameters computing device, set a predistortion model, and the variable step μ (n) and profit of its self-defined LMS algorithm
The pre-distortion coefficients vector A obtained with improved New variable step-size LMS configures to pre-distortion device；Wherein variable step μ (n)
Update mode be
Wherein n is iterative steps, λmaxFor the eigenvalue of maximum of the autocorrelation matrix of list entries, a, b are constant, and
stepoptThe optimum stepsize of optimum coefficient is obtained to update coefficient vector to test data by LMS algorithm, in the present embodiment, 0<
a<stepopt<b<2, it is preferred that a be less than 2 and close to 2 constant, b be more than 0 and close to 0 constant.Total is to pass through
LMS algorithm updates the iteration total step number of coefficient vector to test data, and c, d are constant, and 0<c<=0.5<d<1, will be self-defined
Variable step, which loads, to the pre-distortion device, makes the difference of the recovery signal and corresponding test signal sequence meet to be less than in advance
If threshold value.
In the present embodiment, the memory polynomial model of the predistortion model classics of use：
Wherein, x (n) is the test data of input, and z (n) is output signal, and K and Q are respectively the exponent number of nonlinear polynomial
And memory depth, akqFor model coefficient.Pre-distortion device output vector is represented with Z below, pre-distortion coefficients vector, U are represented with A
Represent predistorter input vector.Then pre-distortion device output vector：
Z=UA (1)
Wherein,
U=[Xn,Xn+1,…,Xn+l-1]T,
Also,
Z=[z (n), z (n+1) ..., z (n+l-1)]T (3)
A=U-1Z (4)
The iteration for asking for using improvement LMS algorithm proposed by the present invention to enter row coefficient of pre-distortion coefficients is asked in formula (4),
Until error meets required precision set in advance, predistortion model that the pre-distortion coefficients obtained are used in modulator.
Traditional LMS algorithm is proposed based on least-mean-square error algorithm and steepest descent method, and aiming at makes predistortion
Device exports the assembly average E { e with the square-error of desired signal2(n) it is } minimum, it is special according to the statistics of a kind of data of input
Property seeks optimum performance.The present invention is one group of list entries with n=0,1,2 ..., L-1, if predistortion model after tested and is tested
Card is k in polynomial order, and memory depth can reach optimum performance when being q, then the number m=k × q, U of pre-distortion coefficientslmFor l
× m list entries matrix.
Traditional LMS arthmetic statement is：
Initialize pre-distortion coefficients vector：wm(0)=0；
Calculate it is predistorted after reality output：
Estimation error：dl(n) it is expectation sequence.
Coefficient vector updates：wm(n+1)=wm(n)+μUlm′(n)e(n)
Wherein, μ is step factor, for control stability and convergence rate, typically(λmaxIt is input sequence
The eigenvalue of maximum of row autocorrelation matrix), coefficient vector is updated by coefficient vector more new formula iteration, when iterating to error
When estimation is less than predetermined threshold value, it is defined as restraining, stops iteration, and output factor vector A is used to calculate：Z=UA.
For LMS algorithm, when step-length is bigger, weight coefficient can accelerate convergence rate to be drawn close to optimum coefficient, and is walked
When long smaller, weight coefficient can smoothly be drawn close with slower speed to weight coefficient.Therefore the selection of step-length directly affects LMS calculations
The performance of method.The present invention have studied influence of the step-length to LMS algorithm after being emulated to LMS algorithm, it was found that even in passing through
After iteration convergence, influence of the different pre-distortion coefficients organized to system still has larger gap, and this explanation is for seeking optimum pre-distortion
The algorithm of coefficient is stable not enough, and the present invention proposes the step factor in a kind of simple algorithm correction algorithm, variable step μ
(n) more new formula is writeable into w (n+1)=w (n)+μ (n) e (n) U (n) (5)
In formula (5), U (n) is the signal matrix for inputting predistorter, and Δ w (n)=μ (n) e (n) U (n) represent filtering power system
The adjustment amount of number vector iteration renewal.In order to reach the purpose of Fast Convergent, it is necessary to the value of suitably selected μ (n) variable step, connect
Acceptance Tests signal sequence and transmitting sequence, the matrix U of some test signal sequence or transmitting sequence compositions is received, that is, passes through meter
Calculate Z=UA and obtain pre-distortion device output vector Z；
The present invention improves constringency performance using the method for the simple by stages setting step-length easily realized, in the present embodiment, if
The optimum stepsize verified through former iterative algorithm is stepopt(0<stepopt<2), iteration total degree is total：
In formula (6), λmaxFor the eigenvalue of maximum of autocorrelation matrix, the coefficient used, can be according to the actual requirements for empirical value
Be sized, principle is first algorithm is restrained as early as possible with big step-length, then with moderate step-length continue to converge to it is steady, finally with compared with
Small step-length refines increment, realizes that stable state restrains.This method has very high flexibility, can refine piecewise interval as needed, warp
The simulating, verifying program on the basis of original algorithm is not changed, by refine piecewise interval replace step-length can make it is predistorted after
Out-of-band rejection improve about 3dB because the coefficient obtained with original algorithm and nonoptimal value, modified hydrothermal process make algorithm more
Close to optimal coefficient, and predistortion chooses more sensitivity to coefficient, therefore such processing improves the non-linear benefit of predistortion
Repay effect.
In the present embodiment, Test data generation device firstly generates test signal sequence, this cycle tests be receiving terminal
Know, send pre-distortion device, modulating device and power amplification device to and handled and be sent to reception device and detected, then
Pre-distortion coefficients vector, and the error point compared with test signal are calculated by self-defined variable step to the signal received
Analysis, the recovery signal that will be obtained make the difference with corresponding test signal sequence, less than predetermined threshold value, then become step transmission by self-defined
To pre-distortion device, then, pre-distortion device receives the transmitting sequence of Test data generation device generation again, just joins in predistortion
LMS algorithm is carried out according to this self-defined variable step in number computing device pre-distortion coefficients vector, pre-distortion coefficients arrow is calculated
Amount A configures to pre-distortion device, the matrix that device transmitting sequence forms is obtained pre- mistake with pre-distortion coefficients Vector operation
True device output vector, so as to complete the predistortion to transmitting sequence, improve the nonlinear compensation effect of predistortion.
The present invention proposes a kind of system of wideband digital predistortion to wideband data transmission system, except suitable for spaceborne number
According to transmission, other equally applicable high speed data transmission systems.The present invention passes through refinement point on the basis of original algorithm is not changed
Step-length is replaced in section section, the step factor in modified LMS algorithm, can make it is predistorted after Out-of-band rejection improve about 3dB, more connect
Nearly optimal coefficient, and predistortion chooses more sensitivity to pre-distortion coefficients vector A, therefore the present invention improves the non-thread of predistortion
Property compensation effect.The present invention use broadband phase-looked loop and relevant peaks technology, the sending and receiving such as satellite system that such as sending and receiving separate without
Still reception device and the direct sending and receiving synchronizing information of dispensing device can be realized in the case that method is homologous.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (7)
1. a kind of RF power amplification linearized system based on wideband modulator, including reception device, channel and emitter, its
It is characterised by, the emitter comprises at least：
Test data generation device, generate test signal sequence and transmitting sequence；
Pre-distortion device, test signal sequence and transmitting sequence are received, receives some test signal sequence or transmitting sequence groups
Into matrix U, i.e., obtain pre-distortion device output vector Z by calculating Z=UA；
Modulating device, pre-distortion device output vector Z is modulated, exports modulated signal；And
Power amplification device, power amplification is carried out to the modulated signal, and the signal after power amplification is launched by channel；
Comprised at least in the reception device:
Synchronous demodulation device, an intermediate-freuqncy signal is obtained to the radiofrequency signal down coversion received, and the intermediate-freuqncy signal is carried out
Carrier synchronization, and be demodulated according to modulation system；
Recover data set, linear equalization calculating and hard decision are carried out to the signal after the processing of synchronous demodulation device, obtained extensive
Complex signal；
Pre-distortion parameters computing device, sets a predistortion model, and the variable step μ (n) of its self-defined LMS algorithm and using changing
The pre-distortion coefficients vector A that the New variable step-size LMS entered obtains configures to pre-distortion device；Wherein variable step μ (n) is more
New paragon is
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Wherein n is iterative steps, λmaxFor the eigenvalue of maximum of the autocorrelation matrix of list entries, a, b are constant, and stepopt
The optimum stepsize of optimum coefficient, 0 ＜ a ＜ step are obtained to update coefficient vector to test data by LMS algorithmopt＜ b ＜ 2；
Total is the iteration total step number for updating coefficient vector to test data by LMS algorithm, and c, d are constant, make the recovery signal
And the difference of corresponding test signal sequence is less than predetermined threshold value.
A kind of 2. RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that U m
L × m of group test signal sequence composition matrix, wherein l are the element number of every group of signal sequence, m=K × Q, K and Q difference
Represent the exponent number and memory depth of predistortion model nonlinear polynomial.
3. a kind of RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that described
Synchronous demodulation device includes phaselocked loop and relevant peaks search device, and searching device by the phaselocked loop and relevant peaks makes
The carrier phase of the intermediate-freuqncy signal reaches synchronous.
4. a kind of RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that a is
Less than 2 and close to 2 constant, b be more than 0 and close to 0 constant.
5. a kind of RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that described
Predistortion model is：
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Wherein, x (n) is the test data of input, and z (n) is output signal, and K and Q are respectively the exponent number and note of nonlinear polynomial
Recall depth, akqFor model coefficient.
A kind of 6. RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that LMS
In algorithm, coefficient vector A=w is initializedm(0)=0, the more new formula of coefficient vector is w (n+1)=w (n)+μ (n) e (n) U
(n), wherein e (n) is the difference after the predistortion after nth iteration between output signal and desired signal, and U (n) is that input is pre-
The signal matrix of distortion.
7. a kind of RF power amplification linearized system based on wideband modulator as claimed in claim 1, it is characterised in that wherein
0<c<=0.5<d<1.
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| EP3166223B1 (en) * | 2015-10-13 | 2020-09-02 | Analog Devices Global Unlimited Company | Ultra wide band digital pre-distortion |
| CN106658544B (en) * | 2015-10-28 | 2021-02-02 | 中兴通讯股份有限公司 | Base station and predistortion parameter updating method thereof |
| CN109039969B (en) * | 2017-06-09 | 2020-11-27 | 中国工程物理研究院电子工程研究所 | Method for implementing broadband digital predistorter |
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