CN105978500B - Analog predistortion system, transceiver and communication equipment - Google Patents
Analog predistortion system, transceiver and communication equipment Download PDFInfo
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- CN105978500B CN105978500B CN201610279220.1A CN201610279220A CN105978500B CN 105978500 B CN105978500 B CN 105978500B CN 201610279220 A CN201610279220 A CN 201610279220A CN 105978500 B CN105978500 B CN 105978500B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
Abstract
The embodiment of the invention provides a kind of analog predistortion system, transceiver and communication equipments.The analog predistortion system includes: APD, PA and pre-distortion coefficients generator；Wherein, the APD for receiving pre-distortion coefficients from the pre-distortion coefficients generator, and does pre-distortion to radiofrequency signal based on the pre-distortion coefficients to obtain pre-distorted signals；The PA, for carrying out power amplification to the pre-distorted signals and obtaining transmitting signal；The pre-distortion coefficients generator calculates the pre-distortion coefficients for collecting the radiofrequency signal and the transmitting signal, and based on the radiofrequency signal and the transmitting signal；Wherein, which includes phase regulator, which is used to carry out phase adjustment to the transmitting signal or the analog baseband signal generated after transmitting signal conversion using phase adjustment signal.
Description
Technical field
The present embodiments relate to the communications fields, and more particularly, to analog predistortion system, transceiver and lead to
Believe equipment.
Background technique
In a base station, PA (Power Amplifier, power amplifier) transmitting distortion be the key that influence communication quality because
Element.How corrected technology is distorted to PA transmitting and is also known as predistortion, is base station problem to be solved.
If pre-distortion is carried out to digital signal, referred to as DPD (Digital Predistorter, number
Predistortion).If pre-distortion is carried out to analog signal, (Analog Predistorter, simulation are pre- by referred to as APD
Distortion).
Fig. 1 is a kind of structural schematic diagram of analog predistortion system of the prior art.In Fig. 1, RFin, RFout, RFfb,
RF1, RF2, RF3, RF4 are analog signals, more specifically radiofrequency signal.As shown in Figure 1, the radio frequency by up-conversion is believed
Number RF1 points are two-way: arriving time delay circuit all the way, become RF2 signal；All the way by becoming RFin signal, RFin after coupler
Signal is sent to APD core (core) processor and APD training aids (trainer).APD training aids utilizes the feed-forward signal inputted
RFin and feedback signal RFfb calculating simulation pre-distortion coefficients, i.e. APD coefficient, then give APD coefficient to APDcore module.
APD core processor is handled RFin signal according to APD coefficient, the pre-distorted signals RFout that obtains that treated.It is pre- to lose
True signal RFout is mixed by coupler and the radiofrequency signal RF2 that is not distorted by delay, is obtained RF3 signal, is then sent again
RF4 signal is generated to PA.RF4 signal is coupled to antenna (ANT), and generates the feedback signal by another coupler
RFfb。
When the pre-distortion coefficients that APD training aids is sent to APD core processor have enough accuracy, predistortion
Signal RFout just just offsets the distortion that PA is generated, and the output signal RF4 of PA is just almost complete with undistorted radiofrequency signal RF1
It is complete consistent, to reach ideal predistortion correction.
But in the APD system architecture of the prior art, it cannot achieve the standard of phase of the PA from input signal to output signal
Really control.
Summary of the invention
The embodiment of the invention provides a kind of analog predistortion system, transceiver and communication equipment, can be realized PA from
Phase controlling of the input signal to output signal.
In a first aspect, providing a kind of analog predistortion system, which includes: that APD, PA and pre-distortion coefficients generate
Device；Wherein,
The APD, for receiving pre-distortion coefficients from the pre-distortion coefficients generator, and based on the pre-distortion coefficients to radio frequency
Signal does pre-distortion to obtain pre-distorted signals；
The PA, for carrying out power amplification to the pre-distorted signals and obtaining transmitting signal；
The pre-distortion coefficients generator, for collecting the radiofrequency signal and the transmitting signal, and based on the radiofrequency signal and
The transmitting signal calculates the pre-distortion coefficients；
Wherein, which includes phase regulator, which is used to believe using phase adjustment
Number the analog baseband signal that generates carries out phase adjustment to the transmitting signal or after transmitting signal conversion.
With reference to first aspect, in the first possible implementation, it implements are as follows: the pre-distortion coefficients generator is also
It include: APD training aids, FFRX, FBRX, LO；Wherein,
The LO is for generating the local oscillation signal；
The FFRX is mixed to obtain feed-forward signal for receiving the radiofrequency signal with the local oscillation signal；
The FBRX is mixed to obtain the Analog Baseband letter of the transmitting signal with the local oscillation signal for receiving the transmitting signal
Number；
The phase regulator is used to utilize the phase adjustment signal, carries out phase to the analog baseband signal of the transmitting signal
Adjustment obtains transmitting adjustment signal；
The APD training aids is used to receive the feed-forward signal and the transmitting adjustment signal, and according to the feed-forward signal and the hair
Adjustment signal is penetrated to be trained to obtain the pre-distortion coefficients.
The possible implementation of with reference to first aspect the first, in the second possible implementation, specific implementation
Are as follows: the phase regulator includes DVM, which includes analog-digital converter and multiplier, wherein
The analog-digital converter is used to the analog baseband signal of the transmitting signal being converted to digital signal；
Digital signal after the multiplier is used to convert the analog baseband signal of the transmitting signal is believed with the phase adjustment
Number multiplication obtains the transmitting adjustment signal.
With reference to first aspect, in the third possible implementation, it implements are as follows: the pre-distortion coefficients generator is also
It include: APD training aids, FFRX, FBRX, LO；Wherein,
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and obtains transmitting tune
Entire signal；
The LO is for generating local oscillation signal；
The FFRX is mixed to obtain feed-forward signal for receiving the radiofrequency signal with the local oscillation signal；
The FBRX is mixed to obtain feedback signal for receiving the transmitting adjustment signal with the local oscillation signal of the LO；
The APD training aids is used to receive the feed-forward signal and the feedback signal, and according to the feed-forward signal and the feedback letter
It number is trained to obtain the pre-distortion coefficients.
With reference to first aspect, in the fourth possible implementation, it implements are as follows: the pre-distortion coefficients generator is also
It include: APD training aids, VGA, PDET, analog-digital converter, subtracter；Wherein
The APD training aids is used to receive the digital signal for carrying error power from the analog-digital converter, and according to this
Error power is trained to obtain the pre-distortion coefficients, and generates AGC signal；
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and obtains transmitting tune
Entire signal；
The subtracter is used to generate RF error signal according to the radiofrequency signal and the transmitting adjustment signal；
The VGA is used to utilize the AGC signal, and the RF error signal generates error transfer factor signal, the AGC based on the received
Signal is used to control the size of the error transfer factor signal within a predetermined range, which reduces the transmitting for adjusting
Error amount between adjustment signal and the radiofrequency signal, the error transfer factor signal are voltage signal；
The PDET is for detecting the error transfer factor signal of the VGA, and by the error transfer factor of voltage signal form
Signal, which receives and detects the power level of the error transfer factor signal, obtains power signal；
The analog-digital converter is used to receive the power signal of the PDET, and the power signal is converted to and carries the mistake
The digital signal of poor power.
The 4th kind of possible implementation of the third possible implementation or first aspect with reference to first aspect,
In 5th kind of possible implementation, specific implementation are as follows: the phase regulator includes DCVM, which is used to utilize the phase tune
The transmitting signal is multiplied to obtain the transmitting adjustment signal with the phase adjustment signal in radio frequency domains by entire signal.
The 5th kind of possible implementation with reference to first aspect, in a sixth possible implementation, specific implementation
Are as follows: the DCVM includes QPS, the first multiplier, the second multiplier and adder, wherein
The QPS generates orthogonal first via signal and second road signal for the transmitting signal；
First multiplier is used to receive the first via signal from the QPS, and by the first via signal and the phase adjustment
In-phase coefficient signal multiplication corresponding to signal obtains third road signal；
Second multiplier is used to receive the second road signal from the QPS, and by the second road signal and the phase adjustment
Orthogonal coefficient signal multiplication corresponding to signal obtains the 4th road signal；
The adder is used to receive the third road signal of first multiplier and the 4th road signal of second multiplier, and
It carries out sum operation and obtains the transmitting adjustment signal.
With reference to first aspect or the 6th kind of the first possible implementation of first aspect to first aspect possible
Any possible implementation in implementation, in the 7th kind of possible implementation, specific implementation are as follows: the simulation is lost in advance
True device APD includes time delay circuit and APD core processor, wherein
Time delay circuit obtains time delayed signal for doing delay process to radiofrequency signal；
APD core processor, for processing to obtain predistortion error signal to radiofrequency signal based on the pre-distortion coefficients；
Wherein, the predistortion error signal and the time delayed signal be used to be coupled together to obtain the pre-distorted signals.
Second aspect provides a kind of transceiver, and any of the above-described kind including first aspect or first aspect possible
System and antenna in implementation, wherein the antenna is for emitting the transmitting signal.
The third aspect provides a kind of communication equipment, including second aspect transceiver and processor, wherein at this
Device is managed for realizing wireless communication protocol processing.
Based on above scheme, analog predistortion system, transceiver and the communication equipment of the embodiment of the present invention pass through introducing
Phase regulator, the analog baseband signal after transmitting signal or transmitting signal conversion to PA output carry out phase adjustment, and
Pre-distortion coefficients are determined based on the difference of signal of the transmitting signal after phase adjusted and radiofrequency signal, according to the pre-distortion coefficients
Pre-distorted signals are determined, so as to realize phase controlling of the PA from input signal to output signal.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of analog predistortion system of the prior art.
Fig. 2 is the structural schematic diagram of analog predistortion system of the embodiment of the present invention.
Fig. 3 is another structural schematic diagram of analog predistortion system of the embodiment of the present invention.
Fig. 4 is the yet another construction schematic diagram of analog predistortion system of the embodiment of the present invention.
Fig. 5 is a kind of circuit diagram of DVM of the embodiment of the present invention.
Fig. 6 is the yet another construction schematic diagram of analog predistortion system of the embodiment of the present invention.
Fig. 7 is a kind of circuit diagram of DCVM of the embodiment of the present invention.
Fig. 8 is the yet another construction schematic diagram of analog predistortion system of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Fig. 2 is the schematic block diagram of analog predistortion system of the embodiment of the present invention.As shown in Fig. 2, analog predistortion system 200
Can include: APD (Analog Predistorter, analog predistortion device) core processor, PA (Power Amplifier, function
Rate amplifier) and analog predistortion coefficients generator.Wherein,
APD for receiving pre-distortion coefficients from the pre-distortion coefficients generator, and believes radio frequency based on the pre-distortion coefficients
Number pre-distortion is done to obtain pre-distorted signals, wherein pre-distortion coefficients are used to compensate the distortion of PA generation；
PA, for carrying out power amplification to the pre-distorted signals and obtaining transmitting signal；
Pre-distortion coefficients generator for collecting the radiofrequency signal and the transmitting signal, and based on the radiofrequency signal and is somebody's turn to do
Transmitting signal calculates the pre-distortion coefficients；
Wherein, which includes phase regulator, which is used to believe using phase adjustment
Number the analog baseband signal that generates carries out phase adjustment to the transmitting signal or after transmitting signal conversion.
Transmitting in the embodiment of the present invention, by introducing phase regulator in pre-distortion coefficients generator, to PA output
Signal or the transmitting signal conversion after analog baseband signal carry out phase adjustment, and based on transmitting signal it is phase adjusted after
The difference of signal and radiofrequency signal determines pre-distortion coefficients, pre-distorted signals is determined according to the pre-distortion coefficients, so as to reality
Existing phase controlling of the PA from input signal to output signal.
As shown in Fig. 2, in analog predistortion system 200,
APD receives the digital signal R25 for carrying pre-distortion coefficients from pre-distortion coefficients generator, and according to the predistortion
Coefficient carries out pre-distortion to radiofrequency signal R21, the pre-distorted signals R22 that obtains that treated；
PA carries out power amplification to pre-distorted signals R22 and obtains transmitting signal R23；
Pre-distortion coefficients generator by collecting radiofrequency signal R21 and transmitting signal R23, and according to radiofrequency signal R21 and
Emit signal R23 and generates the digital signal R25 for carrying pre-distortion coefficients.
Wherein, pre-distortion coefficients generator may also include phase regulator, which can believe according to phase adjustment
Number R24 is to transmitting signal R23 or emits the analog baseband signal of signal R23 and carries out phase adjustment and obtain transmitting adjustment signal, in advance
Distortion factor generator further generates the number letter for carrying pre-distortion coefficients according to radiofrequency signal R21 and the transmitting adjustment signal
Number R25.
It should be understood that pre-distortion coefficients generator can collect radiofrequency signal R21 and transmitting signal R23 in several ways.Example
Such as, radiofrequency signal R21 and transmitting signal R23 can be coupled out signal all the way respectively, is transmitted to pre-distortion coefficients generator, etc.
Deng.Certainly, it is also not excluded for using other implementations, details are not described herein for the embodiment of the present invention.
Fig. 3 is another structural schematic diagram of analog predistortion system of the embodiment of the present invention.Optionally, such as the heavy line of Fig. 3
Shown in region, APD may include time delay circuit and APD core processor.Wherein,
Time delay circuit obtains time delayed signal for doing delay process to radiofrequency signal.Time delay circuit may include one or
Multiple time-delay unit circuits.
APD core processor, for processing to obtain predistortion error signal to radiofrequency signal based on the pre-distortion coefficients.
Wherein, the predistortion error signal and the time delayed signal be used to be coupled together to obtain the pre-distorted signals.
As shown in figure 3, time delay circuit, which carries out delay process to radiofrequency signal R21, obtains time delayed signal R32.At APD core
Reason device handles radiofrequency signal R21 to obtain predistortion error signal R31 based on carrying and the digital signal of distortion factor, in advance
Distortion signal R31 and time delayed signal R32 are coupled together to obtain pre-distorted signals.
It should be understood that pre-distorted signals R31 is the precompensated signal to radiofrequency signal R21, obtained based on pre-distortion coefficients
It arrives.The digital signal R25 for carrying pre-distortion coefficients can be multiplied to obtain pre-distorted signals R31 with radiofrequency signal R21.Specifically
Ground, in the prior art there are many implementation, the present embodiment does not repeat the circuit structure of the APD core processor.
It should be understood that pre-distortion coefficients generator other than phase regulator, may also include multiple functional components.It is right below
The component part of pre-distortion coefficients generator is described further.
Fig. 4 is another structural schematic diagram of analog predistortion system of the embodiment of the present invention.Optionally, implement as one
Example, as shown in the heavy line region of Fig. 4, other than phase regulator, pre-distortion coefficients generator may also include that APD training aids,
FFRX (Feedforward Receiver, feedover receiver), FBRX (Feedback Receiver, feedback receiver) and LO
(Local Oscillator, local oscillator)；Wherein,
The LO is for generating local oscillation signal；
The FFRX carries out frequency conversion to the radiofrequency signal using the local oscillation signal and obtains feedforward letter for receiving radiofrequency signal
Number；
The FBRX carries out frequency conversion to the transmitting signal using the local oscillation signal and obtains the transmitting for receiving transmitting signal
The analog baseband signal of signal；
The phase regulator is used to utilize phase adjustment signal, carries out phase tune to the analog baseband signal of the transmitting signal
It is whole to obtain transmitting adjustment signal；
The APD training aids is used to receive the feed-forward signal and the transmitting adjustment signal, and according to the feed-forward signal and the hair
Adjustment signal is penetrated to be trained to obtain the pre-distortion coefficients.
Specifically, as shown in figure 4, a kind of circuit connection implementation of analog predistortion system 400 is as follows:
The first input end of the input terminal of the time delay circuit, the first input end of the APD core processor and the FFRX is all
It is connected with the first input end of the analog predistortion system 400, the output end of the time delay circuit is defeated with the APD core processor
Outlet is connected with the input terminal of the PA respectively, and the output end of the PA is connected with the first input end of the FBRX, the output end of the LO
It is connected respectively with the second input terminal of the FBRX and FFRX, the first input end of the output end of the FFRX and the APD training aids
Be connected, the output end of the FBRX is connected with the first input end of the phase regulator, the second input terminal of the phase regulator and
Second input terminal of the analog predistortion system 400 is connected, and the second of the output end of the phase regulator and the APD training aids is defeated
Enter end to be connected, the output end of the APD training aids is connected with the second input terminal of the APD core processor.
The function of APD (time delay circuit and APD core processor) is similar with embodiment illustrated in fig. 3 in embodiment illustrated in fig. 4,
The signal stream of its input and output also uses identical signal traffic identifier with Fig. 3, indicates identical meaning.In addition, as shown in figure 4,
APD training aids is used to receive feed-forward signal R42 and transmitting adjustment signal R44, and according to feed-forward signal R42 and transmitting
Adjustment signal R44 is trained to obtain the digital signal R25 for carrying pre-distortion coefficients.Specifically, indicated by digital signal R25
Pre-distortion coefficients be used to compensate PA generation distortion.For example, feed-forward signal R42 reflects the signal before PA transmitting, transmitting is adjusted
Entire signal R44 then reflects the signal after PA amplification.The APD training aids can calculate feed-forward signal R42 and transmitting adjustment letter
The difference of number R44 obtains the distortion of PA or error and generates a penalty coefficient, i.e. predistortion based on the distortion or error
Coefficient.The pre-distortion coefficients can be by being to input to table look-up to obtain with the distortion or error.Therefore in the APD training aids
May include a lut circuits or the APD training aids can to search its external lut circuits described to obtain
Pre-distortion coefficients.The APD training aids can be by a variety of specific implementations, and are referred to the prior art.Certainly, predistortion system
Several acquisitions is also possible to directly be calculated based on the logical operation circuit in APD training aids rather than centainly by fortune of tabling look-up
It calculates and realizes.The specific implementation of the APD training aids is found in the prior art, and the present embodiment does not repeat.
LO is for generating local oscillation signal R41.Specific implementation can refer to design in the prior art.
FFRX carries out frequency conversion to radiofrequency signal R21 using local oscillation signal R41 and obtains base for receiving radiofrequency signal R21
Band signal, i.e. feed-forward signal R42.Feed-forward signal R42 can form the road I signal and the road Q letter under the frequency conversion of local oscillation signal R41
Number.This converter technique is a kind of basic down coversion and lower mixing, and the baseband signal of formation includes I/Q (inphase/orthogonal) two
Road signal, FFRX specifically may include zero intermediate frequency reciver, and such as IQ low-converter, specific works mode can refer in the prior art
Design.
FBRX carries out frequency conversion to transmitting signal R23 using local oscillation signal R41 and is sent out for receiving transmitting signal R23
Penetrate the analog baseband signal R43 of signal R23；Analog baseband signal R43 may include I/Q two paths of signals.FBRX specifically may include
Zero intermediate frequency reciver, such as IQ low-converter, specific works mode can refer to design in the prior art.
Phase regulator utilizes phase adjustment signal R24 for receiving analog baseband signal R43, believes Analog Baseband
Number R43 carries out phase adjustment and obtains transmitting adjustment signal R44.
In the embodiment of the present invention, by introducing phase regulator, it is anti-again that phase adjustment is carried out to the transmitting signal of PA output
Be fed to APD training aids, so as to PA carry out predistortion correction while, realize PA output signal and input signal it
Between phase controlling.
Fig. 5 is a kind of circuit diagram of DVM of the embodiment of the present invention.Phase regulator corresponding to embodiment illustrated in fig. 4.
As shown in figure 5, the phase regulator includes DVM (Digital Vector Modulator, digital vector modulator), the DVM
It may include analog-digital converter and multiplier, wherein
The analog-digital converter is used to the analog baseband signal of the transmitting signal being converted to digital signal；
Digital signal after the multiplier is used to convert the analog baseband signal of the transmitting signal is believed with the phase adjustment
Number multiplication obtains the transmitting adjustment signal.
The phase adjustment signal R24 road I signal (C_I) and the road Q signal (C_Q) expression, C_I^2+C_Q^2=1, such as adjust
Whole phase is ω, then C_I=cos (ω), C_Q=Sin (ω)；The input analog signal of the input terminal of DVM, i.e., it is real shown in Fig. 4
Apply the road the I signal (simulation input I) and the road Q signal (simulation input Q) for needing to carry out the signal R43 of phase adjustment in example.Pass through
ADC (analog-digital converter) obtains the road the I signal (ADC_I) and the road Q signal of the corresponding digital signal of input analog signal
(ADC_Q), then respectively pass through digital multiplier and the road the I signal (C_I) and the road Q signal (C_Q) phase that indicate phase adjustment signal
Multiply, to obtain the road the I signal (numeral output I) and the road Q signal (numeral output Q) of output signal, the road the I signal of the output and
The road Q signal is transmitting adjustment signal (R2d), wherein the product that the road the I signal exported is ADC_I and C_I subtracts ADC_I and C_Q
Product, the road the Q signal of output is that the product of ADC_Q and C_I subtracts the product plus ADC_Q and C_Q.It is with signal shown in Fig. 4
For example, DVM can realize signal R44=signal R43 × signal R24.DVM received signal R43 in the present embodiment is mould
Quasi- signal, the signal R44 of output is digital signal.Therefore FBRX, which can be, is changed into analog baseband signal for transmitting signal R23
The analog baseband signal R43 of form.FFRX is then the feed-forward signal that radiofrequency signal R21 is changed into digital baseband signal form
R42.APD training aids can feed-forward signal R42 to digital signal form and transmitting adjustment signal R44 process.
Fig. 6 is another structural schematic diagram of analog predistortion system of the embodiment of the present invention.Optionally, as another implementation
Example, as shown in the heavy line region of Fig. 6, other than phase regulator, pre-distortion coefficients generator may also include that APD training aids,
FFRX, FBRX and LO；Wherein,
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and obtains transmitting tune
Entire signal.
The LO is for generating local oscillation signal.
The FFRX carries out frequency conversion to the radiofrequency signal using the local oscillation signal and obtains feedforward letter for receiving radiofrequency signal
Number obtain feed-forward signal.
The FBRX carries out frequency conversion to the transmitting adjustment signal for receiving the transmitting adjustment signal, and using the local oscillation signal
Obtain feedback signal.
The APD training aids is used to receive the feed-forward signal and the feedback signal, and according to the feed-forward signal and the feedback letter
It number is trained to obtain the pre-distortion coefficients.
Specifically, as shown in fig. 6, a kind of circuit connection implementation of analog predistortion system 600 is as follows:
The first input end of the input terminal of time delay circuit, the first input end of APD core processor and the FFRX all with this
The first input end of analog predistortion system 600 is connected, the output end of the output end of the time delay circuit and the APD core processor
It is connected respectively with the input terminal of the PA, the output end of the PA is connected with the first input end of the phase regulator, the phase adjustment
Second input terminal of device is connected with the second input terminal of the analog predistortion system 600, the output end of the phase regulator with should
The first input end of FBRX is connected, and the output end of the LO is connected with the second input terminal of the FBRX and FFRX respectively, the FFRX
Output end be connected with the first input end of the APD training aids, the second input terminal of the output end of the FBRX and the APD training aids
It is connected, the output end of the APD training aids is connected with the second input terminal of the APD core processor.
The function of time delay circuit and APD core processor is similar with embodiment illustrated in fig. 3 in embodiment illustrated in fig. 6, defeated
Enter the signal stream of output also with Fig. 3 using identical signal traffic identifier, indicates identical meaning.In addition, in Fig. 6,
LO is for generating local oscillation signal R61.Its function embodiment similar to Figure 4.
FFRX believes that No. R21 progress frequency conversion obtains to the radio frequency for receiving radiofrequency signal R21, and using local oscillation signal R61
To feed-forward signal R62.Its function embodiment similar to Figure 4.
Phase regulator utilizes phase adjustment signal R24 for receiving transmitting signal R23, carries out to transmitting signal R23
Phase adjustment obtains transmitting adjustment signal R63.
FBRX for receive transmitting adjustment signal R63, and will and utilize local oscillation signal R61 to emit adjustment signal R63
It carries out frequency conversion and obtains feedback signal R64.Its function embodiment similar to Figure 4.
APD training aids is used to receive feed-forward signal R62 and feedback signal R64, and according to feed-forward signal R62 and feedback signal
R64 is trained to obtain the digital signal R25 for carrying pre-distortion coefficients.The specific implementation of the APD training aids is found in existing
There is technology, the present embodiment does not repeat.
The difference of Fig. 6 corresponding embodiment and Fig. 4 essentially consist in phase regulator and are located at the input terminal of FBRX rather than export
End realizes that phase adjustment, other parts circuit function have no very big change before transmitting signal R23 is input into FBRX.
A difference of the phase regulator of Fig. 6 compared with the phase regulator of Fig. 4 is that the transmitting adjustment signal R63 of its output is not
The digital signal of baseband signal format but radiofrequency signal, i.e. analog signal.FBRX then adjusts the transmitting of radiofrequency signal form
Signal R63 is changed into digital baseband signal, and function is identical as FFRX.
In the embodiment of the present invention, by introducing phase regulator, it is anti-again that phase adjustment is carried out to the transmitting signal of PA output
Be fed to APD training aids, so as to PA carry out predistortion correction while, realize PA output signal and input signal it
Between phase controlling.
Fig. 7 is a kind of circuit diagram of DCVM of the embodiment of the present invention, the phase adjustment corresponding to embodiment illustrated in fig. 6
Device.As shown in fig. 7, phase regulator may include DCVM (Digital Controlled Vector Modulator, number control
Vector modulator processed), which is used to utilize the phase adjustment signal, believes the transmitting signal and the phase adjustment in radio frequency domains
Number multiplication obtains the transmitting adjustment signal.Specifically, the DCVM may include QPS (Quadrature Phase Splitter, just
Hand over splitter), the first multiplier, the second multiplier and adder.Wherein,
The QPS is used for the signal inputted according to the input terminal of the phase regulator, i.e. transmitting signal R23 generates orthogonal (phase
90 degree of phase difference) first via signal R71 and second road signal R72, and first via signal R71 is output to the first multiplier
First input end, second road signal R72 is output to the first input end of the second multiplier.
First multiplier is used for first via signal R71 and same phase system corresponding to phase adjustment signal R24
Number signal R73 is multiplied to obtain third road signal R75, and is output to the first input end of adder.
Second multiplier is used for orthogonal coefficient corresponding to second road signal R72 and phase adjustment signal R24
Signal R74 is multiplied to obtain the 4th road signal R76.
The adder is used to carry out the signal that add operation obtains to third road signal R75 and the 4th road signal R76
R77 is output to the output end of the phase regulator, the transmitting adjustment signal R64 of signal, that is, corresponding diagram 6 of the output.Wherein, should
Phase adjustment signal R24 includes in-phase coefficient signal R7c and orthogonal coefficient signal R7d.
Fig. 8 is another structural schematic diagram of analog predistortion system of the embodiment of the present invention.Optionally, as another implementation
Example, as shown in the heavy line region of Fig. 8, other than phase regulator, pre-distortion coefficients generator may also include that APD training aids,
VGA (Variable Gain Amplifier, variable gain amplifier), PDET (Power Detector, power detector),
Analog-digital converter, subtracter.
The APD training aids is used to receive the digital signal for carrying error power from the analog-digital converter, and according to this
Error power is trained to obtain the pre-distortion coefficients, and generates AGC (automatic growth control) signal；
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and obtains transmitting tune
Entire signal；
The subtracter is used to generate RF error signal according to the radiofrequency signal and the transmitting adjustment signal；
The VGA is used to utilize the AGC signal, and the RF error signal generates error transfer factor signal, the AGC based on the received
Signal is used to control the size of the error transfer factor signal within a predetermined range, which reduces the transmitting for adjusting
Error amount between adjustment signal and the radiofrequency signal, the error transfer factor signal are voltage signal；
The PDET is for detecting the error transfer factor signal of the VGA, and by the error transfer factor of voltage signal form
Signal, which receives and detects the power level of the error transfer factor signal, obtains power signal；
The analog-digital converter is used to receive the power signal of the PDET, and the power signal is converted to and carries the mistake
The digital signal of poor power.
Specifically, as shown in figure 8, another circuit connection implementation of analog predistortion system 800 is as follows:
The first input end of the APD core processor is connected with the first input end of the analog predistortion system 800, should
Second input terminal of APD core processor is connected with the first output end of the APD training aids, and the first of the APD core processor
Output end is connected with the input terminal of the PA, the second output terminal and the first input end phase of the subtracter of the APD core processor
Even, the output end of the PA is connected with the first input end of the phase regulator, the second input terminal and the mould of the phase regulator
Second input terminal of quasi- pre-distortion system 800 is connected, the second input terminal phase of the output end and the subtracter of the phase regulator
Even, the output end of the subtracter is connected with the first input end of the VGA, and the of the second input terminal of the VGA and the APD training aids
Two output ends are connected, and the output end of the VGA is connected with the input terminal of the PDET, the output end of the PDET and the input terminal of the ADC
It is connected, the output end of the ADC is connected with the input terminal of the APD training aids.
The function of time delay circuit and APD core processor is similar with embodiment illustrated in fig. 3 in embodiment illustrated in fig. 8, defeated
Enter the signal stream of output also with Fig. 3 using identical signal traffic identifier, indicates identical meaning.In addition, embodiment illustrated in fig. 8
In,
The APD training aids be used for from the analog-digital converter receive carry error power digital signal R85, and according to
The error power is trained to obtain the digital signal R25 for carrying the pre-distortion coefficients, and generates AGC signal R86.APD instruction
The specific implementation for practicing device is found in the prior art, and the present embodiment does not repeat.
The phase regulator is used to utilize phase adjustment signal R24, carries out phase adjustment to the transmitting signal R23 and obtains
Emit adjustment signal R81.The specific circuit structure of the phase adjusting module can refer to the embodiment of Fig. 7.
The subtracter is used to generate RF error signal R82 according to the radiofrequency signal R21 and transmitting adjustment signal R81.
RF error signal R82 actually reflects the distortion of PA.
The VGA is used to utilize the AGC signal R86, and RF error signal R82 generates error transfer factor signal based on the received
R83, the AGC signal R86 are used to control the size of error transfer factor signal R83 within a predetermined range, error transfer factor signal R83
Error amount for adjusting to reduce between the transmitting adjustment signal R81 and radiofrequency signal R21, error transfer factor signal R83
For voltage signal；
The PDET is for detecting the error transfer factor signal R83 of the VGA, and by the error tune of the voltage signal form
Entire signal R83, which is received and detected the power level of error transfer factor signal R83, obtains power signal R84；
The analog-digital converter is used to receive the power signal R84 of the PDET, and power signal R84 is converted to and is taken
Digital signal R85 with the error power.
In the embodiment of the present invention, by introducing phase regulator, phase adjustment is carried out to the transmitting signal of PA output, then instead
The pre-distorted signals for being fed to subtracter and PA input terminal carry out radio frequency error calculation, so as to carry out predistortion correction to PA
While, realize the phase controlling between the output signal of PA and input signal.
In the present embodiment, it since RF error signal R82 belongs to radiofrequency signal, is amplified to obtain by VGA first
Voltage signal, and become digital signal by the detection of PDET and ADC conversion, then carried out by APD training aids based on numeric field
Signal processing so as to obtain include pre-distortion coefficients digital signal R25.Wherein APD core processor receives radiofrequency signal
R21, and based on pre-distortion coefficients radiofrequency signal R21 is processed with the pre-distorted signals R31 that obtains that treated, it realizes and PA is lost
Really compensate.The difference of the corresponding embodiment of Fig. 8 and Fig. 4 or Fig. 6 are the distortion for calculating PA or error is not by APD training aids
It calculates and obtains in numeric field, but the distortion or error of PA is calculated in analog domain for subtracter as shown in Figure 8, and should
Error is input to APD training aids after being converted into digital signal, which is receiving the digital signal form
Error after pre-distortion coefficients corresponding with the error can be calculated by searching for table using the error as previously described, can also
Pre-distortion coefficients directly are calculated by logical operation circuit, the present embodiment is without limitation.
The analog predistortion system that above embodiments are mentioned can be applied in transceiver, which includes the mould
Quasi- pre-distortion system and antenna, the output signal that the antenna is used to receive PA, which is concurrently incident upon, eats dishes without rice or wine.The transceiver can
In the communication equipment being not limited to including wireless base station or wireless terminal.Such as a communication equipment may include the transmitting-receiving letter
Machine and processor.The transceiver sends for realizing the radiofrequency signal eated dishes without rice or wine, and the processor is for carrying out channel radio
Believe the algorithm process of agreement, can be specifically used for executing wireless communication protocol software.Software performed by the processor can be deposited
It is stored in a memory.The wireless communication protocol may include that (General Mobile is logical by GSM (global system for mobile communications), UMTS
News system), CDMA (CDMA), any one or more wireless communications in LTE (long term evolution) or WiFi (Wireless Fidelity)
Agreement.
MIMO (multiple-input, multiple-output) technology is introduced in current existing transceiver, is penetrated since each antenna of MIMO is corresponding
Frequency channel needs phase controllable, therefore by using the analog predistortion system in the embodiment of the present invention, is conducive to export PA
Transmitting signal carry out phase adjustment, realize in per the radio-frequency channel MIMO all the way and transmit accurately controlling for signal, improve system
Performance.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
The function, if such as the APD training aids in above-described embodiment function it is real in the form of SFU software functional unit
Now and when sold or used as an independent product, it can store in a computer readable storage medium.Based in this way
Understanding, the technical solution of the present invention substantially portion of the part that contributes to existing technology or the technical solution in other words
Dividing can be embodied in the form of software products, which is stored in a storage medium, including several
Instruction is used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes the present invention
The all or part of the steps of each embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only storage
Device (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or light
The various media that can store program code such as disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. a kind of analog predistortion system characterized by comprising
Analog predistortion device APD, power amplifier PA and pre-distortion coefficients generator；Wherein,
The APD, for receiving pre-distortion coefficients from the pre-distortion coefficients generator, and based on the pre-distortion coefficients to penetrating
Frequency signal does pre-distortion to obtain pre-distorted signals；
The PA, for carrying out power amplification to the pre-distorted signals and obtaining transmitting signal；
The pre-distortion coefficients generator is believed for collecting the radiofrequency signal and the transmitting signal, and based on the radio frequency
Number and the transmitting signal calculating pre-distortion coefficients；
Wherein, the pre-distortion coefficients generator includes phase regulator, and the phase regulator is used to believe using phase adjustment
Number the analog baseband signal that generates carries out phase adjustment to the transmitting signal or after the transmitting signal conversion；Wherein, institute
State pre-distortion coefficients generator further include: APD training aids, feedforward receiver FFRX, feedback receiver FBRX, local oscillator
LO；Wherein,
The LO is for generating local oscillation signal；
The FFRX carries out frequency conversion to the radiofrequency signal using the local oscillation signal and obtains for receiving the radiofrequency signal
Feed-forward signal；
The FBRX carries out frequency conversion to the transmitting signal using the local oscillation signal and obtains for receiving the transmitting signal
The analog baseband signal of the transmitting signal；
The phase regulator is used to utilize the phase adjustment signal, carries out phase to the analog baseband signal of the transmitting signal
Position adjustment obtains transmitting adjustment signal；
The APD training aids for receiving the feed-forward signal and the transmitting adjustment signal, and according to the feed-forward signal and
The transmitting adjustment signal is trained to obtain the pre-distortion coefficients；
Alternatively,
The pre-distortion coefficients generator further include: APD training aids, feedforward receiver FFRX, feedback receiver FBRX, local vibration
Swing device LO；Wherein,
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and is emitted
Adjustment signal；
The LO is for generating local oscillation signal；
The FFRX carries out frequency conversion to the radiofrequency signal using the local oscillation signal and obtains for receiving the radiofrequency signal
Feed-forward signal；
The FBRX carries out the transmitting adjustment signal using the local oscillation signal for receiving the transmitting adjustment signal
Frequency conversion obtains feedback signal；
The APD training aids is for receiving the feed-forward signal and the feedback signal, and according to the feed-forward signal and described
Feedback signal is trained to obtain the pre-distortion coefficients；
Alternatively,
The pre-distortion coefficients generator further include: APD training aids, variable gain amplifier VGA, power detector PDET, mould
Quasi- digital quantizer, subtracter；Wherein
The APD training aids is used to receive the digital signal for carrying error power from the analog-digital converter, and according to institute
It states error power to be trained to obtain the pre-distortion coefficients, and generates automatic growth control AGC signal；
The phase regulator is used to utilize the phase adjustment signal, carries out phase adjustment to the transmitting signal and is emitted
Adjustment signal；
The subtracter is used to generate RF error signal according to the radiofrequency signal and the transmitting adjustment signal；
The VGA is used to utilize the AGC signal, and the RF error signal generates error transfer factor signal, institute based on the received
AGC signal is stated for controlling the size of the error transfer factor signal within a predetermined range, the error transfer factor signal is for adjusting
With the error amount reduced between the transmitting adjustment signal and the radiofrequency signal, the error transfer factor signal is voltage signal；
The PDET is for detecting the error transfer factor signal of the VGA, and by the error tune of voltage signal form
Entire signal, which receives and detects the power level of the error transfer factor signal, obtains power signal；
The analog-digital converter is used to receive the power signal of the PDET, and the power signal is converted to and carries institute
State the digital signal of error power.
2. the system as claimed in claim 1, which is characterized in that the phase regulator includes digital vector modulator DVM, institute
Stating DVM includes analog-digital converter and multiplier, wherein
The analog-digital converter is used to the analog baseband signal of the transmitting signal being converted to digital signal；
The multiplier is used for the digital signal and the phase adjustment after the analog baseband signal conversion of the transmitting signal
Signal multiplication obtains the transmitting adjustment signal.
3. the system as claimed in claim 1, which is characterized in that the phase regulator includes digital control vector modulator
DCVM, the DCVM are used to utilize the phase adjustment signal, believe the transmitting signal and the phase adjustment in radio frequency domains
Number multiplication obtains the transmitting adjustment signal.
4. system as claimed in claim 3, which is characterized in that the DCVM includes:
Quadrature splitter device QPS, the first multiplier, the second multiplier and adder, wherein
The QPS generates orthogonal first via signal and second road signal for the transmitting signal；
First multiplier is used to receive the first via signal from the QPS, and by the first via signal and the phase
In-phase coefficient signal multiplication corresponding to the adjustment signal of position obtains third road signal；
Second multiplier is used to receive the second road signal from the QPS, and by the second road signal and the phase
Orthogonal coefficient signal multiplication corresponding to the adjustment signal of position obtains the 4th road signal；
The adder is used to receive the third road signal of first multiplier and the 4th road signal of second multiplier,
And it carries out sum operation and obtains the transmitting adjustment signal.
5. system according to any one of claims 1 to 4, which is characterized in that the analog predistortion device APD includes:
Time delay circuit obtains time delayed signal for doing delay process to radiofrequency signal；
APD core processor, for processing to obtain predistortion error signal to radiofrequency signal based on the pre-distortion coefficients；Its
In, the predistortion error signal and the time delayed signal be used to be coupled together to obtain the pre-distorted signals.
6. a kind of transceiver, which is characterized in that described including the system and antenna as described in any one of claims 1 to 5
Antenna is for emitting the transmitting signal.
7. a kind of communication equipment, which is characterized in that including transceiver as claimed in claim 6 and processor, the place
Device is managed for realizing wireless communication protocol processing.
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| CN201610279220.1A CN105978500B (en) | 2016-04-29 | 2016-04-29 | Analog predistortion system, transceiver and communication equipment |
| PCT/CN2016/108509 WO2017185750A1 (en) | 2016-04-29 | 2016-12-05 | Analog predistortion system, transceiver, and communications device |
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| CN105978500B (en) * | 2016-04-29 | 2018-12-14 | 华为技术有限公司 | Analog predistortion system, transceiver and communication equipment |
| SG11202013050QA (en) * | 2018-08-20 | 2021-01-28 | China Petroleum & Chem Corp | Modified y-type molecular sieve, catalytic cracking catalyst comprising the same, their preparation and application thereof |
| CN108988794A (en) * | 2018-09-28 | 2018-12-11 | 京信通信系统（中国）有限公司 | A kind of simulated pre-distortion circuit and analog predistortion linear offset method |
| CN109217828B (en) * | 2018-11-12 | 2024-03-22 | 京信网络系统股份有限公司 | Analog predistortion circuit and analog predistortion time division cancellation method |
| CN114338312A (en) * | 2020-10-09 | 2022-04-12 | 意法半导体股份有限公司 | Apparatus and method for linearizing a transmission signal |
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