CN103685109A - Broadband digital pre-distortion multicarrier power amplification system, and power-amplification gain equalization device and method thereof - Google Patents
Broadband digital pre-distortion multicarrier power amplification system, and power-amplification gain equalization device and method thereof Download PDFInfo
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Abstract
The invention discloses a broadband digital pre-distortion multicarrier power amplification system, and a power-amplification gain equalization device and method thereof. The power-amplification gain equalization device comprises an MCU module, a first frequency shift module, an FIR filter module and a second frequency shift module, wherein the MCU module calculates a local-oscillation offset value (f offset) and sends frequency conversion and frequency shift instructions; according to the local-oscillation offset value (f offset), the first frequency shift module shifts the frequency of an input digital signal for + f offset, and outputs the signal to the FIR filter module; the FIR filter module receives and filters the digital frequency-shift signal output by the first frequency shift module; and according to the local-oscillation offset value (f offset), the second frequency shift module receives a filter signal generated by the FIR filter module, shifts the frequency of the filter signal for - f offset, and outputs the signal to a next-stage circuit module. According to the invention, the frequency shift modules and the FIR filter generate digital signals with frequency correction and gain curve equalization, thereby satisfying index requirement of gain flatness by a broadband DPD MCPA system, and ensuring that the gain equalization effect is not changed under the condition that the system local oscillation changes in real time.
Description
Technical field
The present invention relates to the digital processing field of mobile communication, be specifically related to the alignment technique of gain flatness in the band of radiofrequency signal, relate generally to a kind of wideband digital predistortion multi-carrier power amplification system and a kind of power amplifier gain equalization device wherein and with the former corresponding a kind of power amplifier gain equalizing method.
Background technology
Development along with Large scale construction and the communication technology of New Generation of Communication network, raising power amplification efficiency, the investment of reduction operator and operation property expenditure more and more receive operator's concern, the bandwidth of power amplifier is done wider and wider, particularly after the extensive application of multicarrier amplifier (MCPA), power amplifier bandwidth is below original 5MHz, more than being progressively transitioned into 60MHz, follow-up target be reach 100MHz more than, meet the requirement of multimode networking and 4G mobile communication.
In digital pre-distortion multi-carrier power amplification system (DPD MCPA) product, owing to introducing digital pre-distortion (DPD) Technology Restriction in its technology self-characteristic, the instant bandwidth of power amplifier is generally narrower, as lower than 20MHz, in order to work on wider bandwidth of operation, as be greater than 60MHz, the general carrier tracking technique that adopts is first determined the center frequency point of signal, then by changing the local oscillator of DPD MCPA, allow the center frequency point of system and the center frequency point of signal be consistent, thereby expand the bandwidth of operation of DPD MCPA.Fig. 1 is that DPD MCPA bandwidth of operation is expanded schematic diagram, wherein, and f
c0for the center frequency point of DPD MCPA, f
scenter frequency point for signal.When the center frequency point f of signal being detected
safter, thereby the local frequency by automatic change DPD MCPA changes the center frequency point of DPD MCPA, makes f
c1=f
s, can make DPD MCPA be operated in wider frequency range.
Due to the inherent characteristic of radio-frequency devices, frequency response meeting changes along with the change of frequency, in whole working frequency range, is difficult to allow the amplitude of frequency response remain unchanged.Increase along with power amplifier bandwidth, the passband fluctuation of power amplifier is by increasing, in order to allow DPD MCPA all keep essentially identical gain level in whole bandwidth of operation, the communication quality of guaranteeing down link is all identical in whole working range, be necessary to adopt the mode of Digital Signal Processing, signal carried out to the equilibrium treatment of gain fluctuation.
At notification number, be CN101815054B, the day for announcing is in the < < digital communication system of 2012.09.26 and the method > > patent of improving flatness in signal band thereof, propose a kind of digital communication system and improve the method for flatness in signal band, it is processed by the digital filtering in frequency domain, be that test macro wave characteristic obtains frequency domain compensation coefficient, according to frequency domain compensation coefficient, this frequency-region signal is carried out to frequency domain filtering processing, realization is to the correction of signal passband fluctuation and compensation, thereby improve the flatness in each carrier signal passband in digital direct discharging station.
At application number, be in the patent of the adaptive equalization device > > of the < < that discloses of CN101834816A patent announcement based on radio frequency remote equipment, propose a kind of employing downstream signal and feedback signal and carry out adaptive equalization calculating, and constantly update equalization filtering coefficient, finally realize the correction to down link lack of balance characteristic, thereby guarantee that each frequency carrier coverage of radio frequency remote equipment is identical.
Above-mentioned two kinds of methods are all based under the constant prerequisite of radio-frequency (RF) local oscillator signal, downlink link is carried out to gain balance, can only solve in the situation that local oscillation signal is constant, gain fluctuation Correction Problems in bandwidth of operation, can not solve in the situation of local oscillation signal change the Correction Problems of gain fluctuation in bandwidth of operation.
Summary of the invention
The object of the invention is for above-mentioned problems of the prior art, a kind of power amplifier gain equalization device is provided, in system local oscillator, change in situation, can also complete the correction of gain fluctuation in band.
Another object of the present invention is to provide a kind of wideband digital predistortion multi-carrier power amplification system that comprises described power amplifier gain equalization device.
Another object of the present invention is to provide the method that realizes power amplifier gain balance.
For reaching the object of foregoing invention, the present invention is achieved through the following technical solutions:
A kind of power amplifier gain equalization device of the present invention, comprising: MCU module, the local frequency wherein arranging and the local oscillator side-play amount f calculating in real time
offset, for sending down-conversion instruction, the instruction of forward shift frequency and the instruction of negative sense shift frequency; The first shift frequency module, receives the forward shift frequency instruction of MCU module and the local oscillator side-play amount f calculating in real time
offset, and the digital signal of input is carried out to positive side-play amount f
offsetfrequency translation, produce digital frequency-shift signaling, and export FIR filter module to; FIR filter module, the gain range of gain curve under response frequency in the gain range of the passband response curve having and the band of power amplifier output signal, both add and mean value is a fixed gain amplitude, for receiving the digital frequency-shift signaling of the first shift frequency module output and this numeral frequency-shift signaling being carried out to filtering, generate filtering signal; The second shift frequency module, receives the negative sense shift frequency instruction of MCU module and the negative side-play amount-f calculating in real time
offsetwith the filtering signal that receives described FIR filter module generation, and this filtering signal is born to side-play amount-f
offsetfrequency translation, produce digital secondary frequency-shift signaling, and export subordinate's circuit module to.
Described power amplifier gain equalization device also includes: down conversion module, down-conversion instruction for received RF input signal and MCU module, this radio-frequency input signals is carried out to analog down processing, the local frequency arranging according to MCU module, the analog if signal that generation system is required or zero intermediate frequency signals; ADC module, is converted to digital signal for the analog signal that down conversion module is produced, and exports this digital signal to above-mentioned the first shift frequency module.Described the first shift frequency module and the second shift frequency module are multiplication module.
The computational methods of described local oscillator side-play amount are: current local oscillation signal deducts acquiescence local oscillation signal and obtains local oscillator side-play amount f
offset.
Broadband of the present invention DPD MCPA system, the composition structure that it comprises aforementioned power amplifier gain equalization device.This system also comprises DPD module, DAC module, up-converter module and feedback down-conversion module, up-converter module is wherein connected and receives respectively the frequency conversion instruction of MCU module with feedback down-conversion module with MCU module, described DPD module is carried out the signal of the second shift frequency module output of described power amplifier gain equalization device after digital pre-distortion processing, the digital predistortion signal of its formation is converted to analog signal by described DAC module by this signal, and after carrying out frequency conversion, described up-converter module exports to power amplifier, described feedback down-conversion module is obtained described up-converter module output Yi road signal and it is carried out after up-conversion, export to another ADC module and carry out analog-to-digital conversion formation feedback digital signal, then by this signal feedback, give described DPD module, so that described DPD module is carried out pre-distortion to produce digital predistortion signal output according to this feedback digital signal to the digital signal of power amplifier gain equalization device output.
A power amplifier gain equalizing method, comprises the steps:
Step S01, arranges network analyzer for measuring gain curve in the band that does not carry out the wideband digital predistortion multi-carrier power amplification system of power amplifier gain balance while processing, and now the local frequency of system is default value;
Step S02, design power amplifier gain equalization filter coefficient, according to gain curve design power amplifier gain balance in step S01 gained band, process the coefficient of required filter, thereby the gain range of passband response curve and the gain range of the interior gain curve of the band of step S01 gained under response frequency that make this filter, both add and mean value is a fixed gain amplitude;
Step S03, wideband digital predistortion multi-carrier power amplification system input signal carries out gain balance filtering;
Step S04, MCU module is calculated current local oscillation signal and the side-play amount f that gives tacit consent to local oscillation signal in real time
offset, computational methods are the local frequency that current local frequency deducts acquiescence, then according to this side-play amount f
offsetsignal before and after gain balance is carried out respectively to the frequency translation of forward and negative sense.
Described step S02 also comprises and adopts the gain range of gain curve under response frequency in the gain range of passband response curve that the FIR filter of this coefficient has and the band of power amplifier output signal, and both add and mean value is a fixed gain amplitude.
Described step S03 also comprises the down-converted of input signal and analog-to-digital conversion process.
Described step S04 inserts the step of carrying out in the middle implementation of step S03.
Compared with prior art, tool of the present invention has the following advantages:
Power amplifier gain equalization device disclosed in this invention and adopt its wideband digital predistortion multi-carrier power amplification system, to utilize shift frequency module and FIR filter to produce the digital signal of the gain curve equilibrium of frequency correction, when can meet broadband DPD MCPA system to the index request of gain flatness, realize and in the situation that system local oscillator changes in real time, guarantee the effect that gain balance effect remains unchanged.
Accompanying drawing explanation
Fig. 1 is that the bandwidth of operation of wideband digital predistortion multi-carrier power amplification system (DPD MCPA) is expanded schematic diagram.
Fig. 2 is the wideband digital predistortion multi-carrier power amplification system principle schematic that the present invention realizes.
Fig. 3 is the power amplifier gain equalization device schematic diagram that the system of Fig. 2 adopts.
Fig. 4 is the interior gain curve figure of the band of the wideband digital predistortion multi-carrier power amplification system while not installing power amplifier gain equalization device additional.
Fig. 5 is the interior gain curve figure of the band of the frequency response of FIR filter in power amplifier gain equalization device.
Fig. 6 is the gain balance design sketch that installs the wideband digital predistortion multi-carrier power amplification system after power amplifier gain equalization device additional.
Fig. 7 is the control principle schematic diagram of power amplifier gain equalization device of the present invention.
Embodiment
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated:
Fig. 2 is the schematic diagram of broadband of the present invention DPD MCPA system, this embodiment discloses a kind of broadband DPD MCPA system 100 with gain balance function of the present invention, and this system includes down conversion module 101, an ADC module 102, DPD module 106, DAC module 107, up-converter module 108, PA power amplifier module 109, feedback down-conversion module 112 and the 2nd ADC module 111.
Further, Fig. 3 is the power amplifier gain equalization device schematic diagram of the embodiment of the present invention, Fig. 2 and Fig. 3 have disclosed this broadband DPD MCPA system and have also included a kind of power amplifier gain equalization device 200 of the present invention, and described power amplifier gain equalization device 200 includes the first shift frequency module 203, the second shift frequency module 205, FIR filter module 204 and MCU module 110.Because the local frequency of broadband DPD MCPA system 100 can change along with the change of the center frequency point of radio-frequency input signals, easily affect the final effect that FIR filter module is realized gain balance.In order to eliminate local oscillation signal skew adverse effect, adopt each shift frequency module before and after FIR filter, by shift frequency module, signal is carried out to shift frequency processing, thus these power amplifier gain equalization device 200 modules functions and annexation as follows:
Down conversion module 101 is sent to radiofrequency signal that down-conversion instructions make to enter down conversion module 101 to be reduced to intermediate frequency or zero intermediate frequency signals, up-converter module 108 is sent to signal that up-conversion instructions make to enter up-converter module 108 from intermediate frequency or zero intermediate frequency signals, up-converts to radiofrequency signal, feedback down-conversion module 112 is sent to down-conversion instructions makes the signal frequency that enters feedback down-conversion module 112 reduce to intermediate frequency or zero intermediate frequency signals;
The work order that 110 pairs of power amplifier gain equalization devices of MCU module 200 send is as follows:
The first shift frequency module 203 is sent to the instruction of forward shift frequency, and this forward shift frequency instruction is used for opening the first shift frequency module, and makes the signal frequency of inputting the first shift frequency module 203 increase f
offsetrepresented hertz number, i.e. so-called positive side-play amount " f
offset", the second shift frequency module 205 is sent to the instruction of negative sense shift frequency, this negative sense shift frequency instruction is used for opening the second shift frequency module, and makes the signal frequency of inputting the second shift frequency module 205 reduce f
offsetrepresented hertz number, i.e. so-called negative side-play amount " f
offset".
The first shift frequency module 203, increases f for receiving the forward shift frequency instruction of MCU module 110 to the frequency of the digital signal by ADC module 102 these the first shift frequency modules 203 of input
offsethertz number, produce frequency and meet the frequency-shift signaling that FIR filter process requires, and export FIR filter module 204 to.
The second shift frequency module 205, for receiving the negative sense shift frequency instruction of MCU module 110, opens the second shift frequency module 205 and receives the filtering signal that described FIR filter module 204 generates, and the frequency of filtering signal is reduced to f
offsetthe hertz number representing, thus the secondary frequency-shift signaling consistent with the digital signal frequency of input the first shift frequency module produced, and export this secondary frequency-shift signaling to subordinate circuit module.
Situation for radiofrequency signal as input signal, offers the digital signal of the first shift frequency module described in need to radiofrequency signal being converted to by analog-to-digital conversion module.
Radiofrequency signal for input, is prepended to this analog-to-digital conversion module, and also needing by down conversion module 112 is intermediate-freuqncy signal or zero intermediate frequency signals by radiofrequency signal frequency reducing, and exports this intermediate-freuqncy signal or zero intermediate frequency signals to analog-to-digital conversion module.
Further combined with Fig. 4 to Fig. 6, it has disclosed the process that this power amplifier gain equalization device improves signal gain flatness jointly.Fig. 4 is the interior gain curve figure of the band of broadband DPD MCPA system.Fig. 5 is the interior gain curve figure of band of the frequency response of equalization filter.Fig. 6 is the gain balance design sketch of broadband DPD MCPA system, and it is the result of Fig. 4 and two curve combinings of Fig. 5.
The secondary frequency-shift signaling being produced by power amplifier gain equalization device 200 has possessed necessarily required gain wave amplitude, this secondary frequency-shift signaling meets the requirement of broadband DPD MCPA system 100, refer to the control principle schematic diagram of power amplifier gain equalization device of the present invention shown in Fig. 7 below, further disclose this broadband DPD MCPA system 100 and co-ordination mode and the treatment step to input signal of the power amplifier gain equalization device 200 that comprises:
Step S01, network analyzer is set for measuring gain curve in the band of broadband DPD MCPA system, i.e. interconnection network analyzer on the power amplifier of broadband DPD MCPA system that does not install power amplifier gain equalization device 200 additional, be used for measuring amplitude characteristic in DPD MCPA system works frequency band, be gain curve in band, now system is acquiescence local frequency, and corresponding system centre frequency is f
c0;
Step S02, design power amplifier gain equalization filter coefficient, according to the FIR filter coefficient of gain curve design power amplifier gain equalization device 200 in step S01 gained band, thereby make the gain range of gain curve under response frequency in the gain range of power amplifier gain equalization filter passband response curve and the band of step S01 gained, both add and mean value is a fixed gain amplitude;
Step S03, broadband DPD MCPA system 100 input signals carry out gain balance filtering, MCU module 110 is obtained the local frequency LO1 of down-conversion link, the local frequency LO2 of feedback link in advance, and the corresponding startup work with the transmission of input signal of the modules in broadband DPD MCPA system 100, wherein:
The down conversion module 101 being connected with MCU module 110 receives the radiofrequency signal of input, down conversion module 101 also receives down-conversion instruction and the local frequency LO1 that MCU module 110 sends, radiofrequency signal to input is done down-converted, the analog if signal that generation system is required or analogue zero intermediate-freuqncy signal;
The one ADC module 102 receives analog if signal or the analogue zero intermediate-freuqncy signal that down conversion module 101 produces, and above-mentioned signal is sampled and produced digital signal, and the digital signal of generation is transported to the first shift frequency module 203 of power amplifier gain equalization device 200;
In the implementation of step S03, further following steps S04 is carried out in insertion, this step S04, and described MCU module 110 is calculated current local oscillation signal and the side-play amount f that gives tacit consent to local oscillation signal in real time
offset, computational methods are: current local frequency deducts acquiescence local frequency and obtains local oscillator side-play amount, also can wait and be all f
offset=f
c1-f
c0, then the signal before and after gain balance is carried out to frequency translation, first the MCU module 110 in broadband DPD MCPA system 100 calculates the side-play amount f of local oscillator in advance
offset, and then the first shift frequency module 203 that MCU module 110 connects and the second shift frequency module 205 are sent to corresponding shift frequency instruction, wherein:
The first shift frequency module 203 of power amplifier gain equalization device 200 receives the forward shift frequency instruction of MCU module 110 transmissions the digital signal of the one ADC module 102 conversion generations is done to the processing of forward shift frequency, and this numeral frequency-shift signaling is transported to FIR module 204; The digital frequency-shift signaling of 204 pairs of receptions of FIR module is done filtering and is processed and produce filtering signal, and this filtering signal is transported to the second shift frequency module 205; The second shift frequency module 205 receives the negative sense shift frequency instruction of MCU module 110 transmissions this filtering signal is done to the processing of negative sense shift frequency, and this frequency-shift signaling is transported to DPD module 106;
After execution of step S04, continue execution step S03, wherein:
DPD module 106 receives the digital signal of power amplifier gain equalization device 200 outputs, according to the feedback digital signal from the 2nd ADC module 111 outputs, the digital signal of 106 pairs of power amplifier gain equalization devices of DPD module, 200 outputs is carried out digital pre-distortion processing, produce digital predistortion signal, and DPD module 106 is transported to DAC module 107 by this digital predistortion signal;
DAC module 107 receives the digital predistortion signal that DPD module 106 produces, and this digital predistortion signal is carried out to digital-to-analogue conversion processing, produce analog if signal or analogue zero intermediate-freuqncy signal after predistortion, and the analog if signal of this predistortion or analogue zero intermediate-freuqncy signal are transported to up-converter module 108;
Analog if signal or analogue zero intermediate-freuqncy signal that up-converter module 108 receives after above-mentioned predistortion, receive up-conversion instruction and local frequency L02 that MCU module 110 sends simultaneously, thereby above-mentioned signal is done to upconversion process, produce the radiofrequency signal after predistortion, up-converter module 108 is transported to PA module 109 by the radiofrequency signal after this predistortion;
Radiofrequency signal after the predistortion of PA module 109 reception up-converter module 108 outputs, and this signal is carried out to power amplification, thereby produce the radio frequency output signal of DPD MCPA system, this radio frequency output signal is divided into two parts, first is transported to subordinate's circuit as output signal, and the second part is transported to feedback down-conversion module 112 as feedback signal;
Feedback down-conversion module 112 receives the second portion radiofrequency signal of PA module output, receive down-conversion instruction and feedback local frequency L02 that MCU module 110 sends simultaneously, this radiofrequency signal is done to down-converted, produce feedback analog intermediate-freuqncy signal or zero intermediate frequency signals and send the 2nd ADC module 111 to;
The 2nd ADC module 111 receives feedback analog intermediate-freuqncy signal or the zero intermediate frequency signals of feedback down-conversion module 112 outputs, and above-mentioned signal is done to analog-to-digital conversion process, produce feedback digital signal, the 2nd ADC module 111 outputs to DPD module 106 by this feedback digital signal;
To radio-frequency input signals, the processing in system is described further below:
First radio-frequency input signals after down-converted, is the required analog if signal of system or analogue zero intermediate-freuqncy signal by frequency reducing, and this analog if signal or analogue zero intermediate-freuqncy signal form digital signal through analog-to-digital conversion again;
Because the impact of gain flatness in the output signal tape of DPD MCPA system has certain wave form varies, thereby need to do filtering to the input signal of DPD MCPA system and process and make input signal there is opposite gain curve;
When the local frequency of above-mentioned digital signal has been offset the center of power amplifier working band, need be positive side-play amount f to digital signal
offsetshift frequency process after, then process after filtering, make digital signal there is the waveform contrary with power amplifier module flat gain curve, after processing after filtering, must be again negative side-play amount-f
offsetshift frequency process, through the shift frequency of front and back, process, the local frequency that can eliminate digital signal changes the impact with interior gain balance;
Digital signal after shift frequency and filtering processing is done pre-distortion again, is converted to pre-distorted signals; This pre-distorted signals, after digital-to-analogue conversion and upconversion process, is converted to predistortion analog signal;
Predistortion analog signal is left DPD MCPA system finally by crossing after amplification is processed as output signal, and in this system band now, gain curve is straight line.
The power amplifier gain equalization device of broadband disclosed in this invention DPD MCPA system, to utilize shift frequency module and FIR filter to produce the digital signal of the interior gain curve equilibrium of band of frequency correction, when can meet broadband DPD MCPA system to the index request of gain flatness, realize and in the situation that system local oscillator changes in real time, guarantee the effect that gain balance effect remains unchanged.
Above-described embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can modify or be equal to replacement the present invention; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (11)
1. a power amplifier gain equalization device, is characterized in that, described device comprises:
MCU module, the local frequency wherein arranging and the local oscillator side-play amount f calculating in real time
offset, for sending down-conversion instruction, the instruction of forward shift frequency and the instruction of negative sense shift frequency;
The first shift frequency module, receives the forward shift frequency instruction of MCU module and the local oscillator side-play amount f calculating in real time
offset, and the digital signal of input is carried out to positive side-play amount f
offsetfrequency translation, produce digital frequency-shift signaling, and export FIR filter module to;
FIR filter module, the gain range of gain curve under response frequency in the gain range of the passband response curve having and the band of power amplifier output signal, both add and mean value is a fixed gain amplitude, for receiving the digital frequency-shift signaling of the first shift frequency module output and this numeral frequency-shift signaling being carried out to filtering, generate filtering signal;
The second shift frequency module, receives the negative sense shift frequency instruction of MCU module and the negative side-play amount-f calculating in real time
offsetwith the filtering signal that receives described FIR filter module generation, and this filtering signal is born to side-play amount-f
offsetfrequency translation, produce digital secondary frequency-shift signaling, and export subordinate's circuit module to.
2. power amplifier gain equalization device according to claim 1, is characterized in that, described device also includes:
Down conversion module, for the down-conversion instruction of received RF input signal and MCU module, carries out analog down processing to this radio-frequency input signals, the local frequency arranging according to MCU module, the analog if signal that generation system is required or zero intermediate frequency signals;
ADC module, is converted to digital signal for the analog signal that down conversion module is produced, and exports this digital signal to above-mentioned the first shift frequency module.
3. power amplifier gain equalization device according to claim 1, is characterized in that, the computational methods of described local oscillator side-play amount are: current local oscillation signal deducts acquiescence local oscillation signal and obtains local oscillator side-play amount f
offset.
4. power amplifier gain equalization device according to claim 1, is characterized in that, described the first shift frequency module and the second shift frequency module are multiplication module.
5. a wideband digital predistortion multi-carrier power amplification system, is characterized in that, comprises power amplifier gain equalization device as claimed in claim 2.
6. wideband digital predistortion multi-carrier power amplification system according to claim 5, it is characterized in that, this system also comprises DPD module, DAC module, up-converter module and feedback down-conversion module, up-converter module is wherein connected and receives respectively the frequency conversion instruction of MCU module with feedback down-conversion module with MCU module, described DPD module is carried out the signal of the second shift frequency module output of described power amplifier gain equalization device after digital pre-distortion processing, the digital predistortion signal of its formation is converted to analog signal by described DAC module by this signal, and after carrying out frequency conversion, described up-converter module exports to power amplifier, described feedback down-conversion module is obtained described up-converter module output Yi road signal and it is carried out after up-conversion, export to another ADC module and carry out analog-to-digital conversion formation feedback digital signal, then by this signal feedback, give described DPD module, so that described DPD module is carried out pre-distortion to produce digital predistortion signal output according to this feedback digital signal to the digital signal of power amplifier gain equalization device output.
7. a power amplifier gain equalizing method, is characterized in that, comprises the steps:
Step S01, arranges network analyzer for measuring gain curve in the band that does not carry out the wideband digital predistortion multi-carrier power amplification system of power amplifier gain balance while processing;
Step S02, design power amplifier gain equalization filter coefficient, according to gain curve design power amplifier gain balance in step S01 gained band, process the coefficient of required filter, thereby the gain range of passband response curve and the gain range of the interior gain curve of the band of step S01 gained under response frequency that make this filter, both add and mean value is a fixed gain amplitude;
Step S03, wideband digital predistortion multi-carrier power amplification system is carried out gain balance filtering to input signal;
Step S04, MCU module is calculated the side-play amount f of local oscillation signal in real time
offset, according to this side-play amount f
offsetsignal before and after gain balance is carried out respectively to the frequency translation of forward and negative sense.
8. power amplifier gain equalizing method according to claim 7, it is characterized in that, in described step S02, adopt the gain range of gain curve under response frequency in the gain range of passband response curve that the filter of this coefficient has and the band of power amplifier output signal, both add and mean value is a fixed gain amplitude.
9. power amplifier gain equalizing method according to claim 7, is characterized in that, described step S03 also comprises the down-converted to input signal.
10. power amplifier gain equalizing method according to claim 7, is characterized in that, described step S03 also comprises the analog-to-digital conversion process to input signal.
11. power amplifier gain equalizing methods according to claim 7, is characterized in that, described step S04 inserts the step of carrying out in the middle implementation of step S03.
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