CN102291347B - DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum - Google Patents
DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum Download PDFInfo
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Abstract
The embodiment of the invention discloses a DPD (Digital Pre-Distortion) processing method and equipment based on a multiband spectrum. The equipment comprises a first band switching module, a radiofrequency filter, a second band switching module and a DPD processing module, wherein the radiofrequency filter comprises at least two band filters; the first band switching module is used for outputting signals of different bands to band filters of corresponding bands in the radiofrequency filter respectively; the second band switching module is used for obtaining signals processed by the band filters from the radiofrequency filter and outputting a result to the DPD processing module; and the DPD processing module is used for synchronizing the signals processed by each band filter in the radiofrequency filter and performing DPD processing based on the synchronized signals processed by each band filter. In the embodiment of the invention, DPD feedback signal sampling is performed on different bands at different times, so that the sampling rate of a feedback ADC (Analog to Digital Converter) is lowered effectively, and the bandwidth of a channel device is fed back.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of DPD processing method and equipment based on multi-band frequency spectrum.
Background technology
DPD(Digital Pre-Distortion, digital pre-distortion) technology is to pass through feedback path, by the signal back base band of the nonlinear distortion through power amplifier, compare with the baseband signal of transmitting, and carry out after matrix operation according to certain model, draw pre-distortion coefficients, then to transmitting, carry out the process of predistortion correction.Based on DPD technology, in different product designs, there are a plurality of power amplifiers to share a feedback path, have each power amplifier to use separately a feedback path, also have the part of devices to share, but different product, its general structure is basic identical, and it can adopt frequency mixer to carry out frequency conversion, also can adopt quadrature demodulator to carry out frequency conversion, as shown in Figure 1, for adopting the structure chart of the typical feedback circuit of quadrature demodulator.
In Fig. 1, wire frame 1 represents the typical theory diagram of feedback link, and wire frame 2 represents typical down link block diagram.Feedback link shown in Fig. 1 is mainly by DAC(Digital-to-Analog Converter, digital analog converter), LPF(Low Pass Filter, low pass filter), IQ modulator (containing local oscillator), amplifier, PA(Power Amplifier, power amplifier), coupler, circulator, radio-frequency filter, quadrature demodulator (contain local oscillator, in practical application, can also be frequency mixer), ADC(Analog-to-Digital Converter, analog-digital converter), DPD processing module etc. partly forms.
In prior art, support the signal sampling of certain bandwidth that radio-frequency filter is one-segment, radio-frequency filter based on this one-segment, in the feedback link representing at wire frame 1, for feedback the bandwidth of low pass filter, the DPD algorithm in DPD processing module is depended in the requirement of the sampling rate of the ADC of feedback; When DPD algorithm adopts memory multinomial model, the bandwidth that requires feedback is 3 times of signal bandwidth more than bandwidth, comprises distortion components more than 3 rank.
In realizing process of the present invention, inventor finds at least to exist in prior art following problem:
When radio-frequency filter is wider discrete frequency range, will be limited to the restriction of ADC sampling rate and the support of low pass filter to bandwidth; For example, at TD-SCDMA(Time Division-Synchronous Code Division Multiple Access, TD SDMA) in system, there is at present power amplifier can cover the bandwidth range (from 1880MHz ~ 2025MHz) of F+A, if according to the DPD algorithm of average polynomial, needing radio frequency bandwidth is 145MHz, feedback bandwidth needs 3 times or above (be 435MHz or more than), now for low pass filter, relative bandwidth is very wide, realizes difficulty and cost is higher.
In addition, the sampling rate of ADC need to be fs/2 >=450M, i.e. fs >=900Msps, and based on this demand, selectable ADC device does not have; Even if adopt quadrature demodulation pattern, quadrature sampling is eliminated aliasing frequency, also at least needs the ADC of 435Msps or above sampling rate, for guaranteeing the dynamic range of sampling, feedback ADC adopts 11bit device, and the cost under high sampling rate like this is very high.
Summary of the invention
The embodiment of the present invention provides a kind of DPD processing method and equipment based on multi-band frequency spectrum, to adopt compared with low rate ADC, realizes multi-band signal sampling, and realizing DPD, to process needed signal synchronous.
For achieving the above object, the embodiment of the present invention provides a kind of digital pre-distortion DPD treatment facility based on multi-band frequency spectrum, and described DPD treatment facility at least comprises: the first frequency range handover module, the radio-frequency filter that comprises at least two frequency band filters, the second frequency range handover module and DPD processing module; Wherein:
Described the first frequency range handover module, for exporting to the signal of different frequency range respectively the frequency band filter of described radio-frequency filter corresponding frequency band;
Described the second frequency range handover module, for obtain the signal after frequency band filter is processed from described radio-frequency filter, and exports to described DPD processing module by result;
Described DPD processing module, the signal after processing for each frequency band filter of synchronous described radio-frequency filter, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
The embodiment of the present invention provides a kind of digital pre-distortion DPD processing method based on multi-band frequency spectrum, the method is applied to comprise in the DPD treatment facility of the first frequency range handover module, the radio-frequency filter that comprises at least two frequency band filters, the second frequency range handover module and DPD processing module, and the method at least comprises the following steps:
Described the first frequency range handover module is exported to the signal of different frequency range respectively the frequency band filter of corresponding frequency band in described radio-frequency filter;
Described the second frequency range handover module is from obtaining the signal after frequency band filter is processed described radio-frequency filter, and result is exported to described DPD processing module;
Signal in the synchronous described radio-frequency filter of described DPD processing module after each frequency band filter processing, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
Compared with prior art, the embodiment of the present invention at least has the following advantages: in the embodiment of the present invention, by adopting frequency-division section timesharing, carry out the sampling of DPD feedback signal, effectively reduce the feedback sampling rate of ADC and the bandwidth of feedback path device, in existing device level, be issued to and can realize, thereby improved competitiveness; By adopting, launch multi-band signal training sequence, a certain frequency band signals that guaranteed to sample has comprised complete intermodulation distortion component simultaneously; By adopting the mode of quadrature demodulation and quadrature sampling, utilize orthogonal property to eliminate aliasing frequency, under same signal bandwidth, effectively reduce the speed of sampling ADC; By adopting relevant mode to realize the obtaining of synchronous and valid data of frequency-division section time sharing sampling signal, can effectively carry out DPD coefficient calculations.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structure chart of the typical feedback circuit of available technology adopting quadrature demodulator;
Fig. 2 is a kind of DPD treatment facility structural representation based on multi-band frequency spectrum that the embodiment of the present invention one provides;
Fig. 3 is a kind of DPD treatment facility structural representation based on multi-band frequency spectrum that the embodiment of the present invention two provides;
Fig. 4 is synchronous and take out the schematic diagram of valid data after two-band signals collecting in the embodiment of the present invention;
Fig. 5 is a kind of DPD process flow schematic diagram based on multi-band frequency spectrum that the embodiment of the present invention three provides.
Embodiment
Inventor notices in realizing process of the present invention:
At present in high-power wireless equipment, the efficiency of power amplifier and linear contradiction, therefore DPD technology+Dotherty power amplifier has become solution employing small-power grade power tube as far as possible, solves the major technique of linear problem in less rollback situation.
The current DPD technology for same frequency spectrum arrowband scope has more maturation application, but in wide frequency range and discontinuous multiband situation, for example, TD-SCDMA system has discontinuous several frequency range: F(1880-1920MHz), A(2010-2025 MHz), E(2320-2370 MHz), D(2575-2615 MHz); Existing processing mode is that every frequency range adopts independent link, independent power amplifier, and which volume, power consumption, cost all can have a doubly level relation; If adopt wideband power amplifier to cover a plurality of frequency ranges, can well save volume, power consumption, Cost Problems simultaneously.
But, linear technique under the RST of the same power amplifier output of current solution multiband still has a lot of restrictions, and according to traditional DPD model and algorithm, feedback path bandwidth need to reach at least 3 times of signal bandwidth, could realize 3 rank samplings, realize digital pre-distortion and proofread and correct.Across multifrequency in the situation that, for example F and A frequency, more than signal bandwidth will reach 145MHz, and need the ADC of the above sampling rate of 435M, obviously, is difficult to realize in prior art.
For the problems referred to above, the embodiment of the present invention provides a kind of DPD processing method and equipment based on multi-band frequency spectrum, for multiband broadband signal, adopt compared with low rate ADC and realize multi-band signal sampling, and realizing digital DPD, to process needed data synchronous.
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
The embodiment of the present invention one provides a kind of DPD treatment facility based on multi-band frequency spectrum, as shown in Figure 2, this DPD treatment facility at least comprises: the first frequency range handover module 11, the radio-frequency filter 12, the second frequency range handover module 13 and the DPD processing module 14 that comprise at least two frequency band filters; Wherein:
The first frequency range handover module 11, for exporting to the signal of different frequency range respectively the frequency band filter of radio-frequency filter 12 corresponding frequency band; For example, the first frequency range handover module 11 is exported to the signal of frequency range 1 frequency band filter of radio-frequency filter 12 Mid Frequency 1 correspondences.
In the embodiment of the present invention, this first frequency range handover module 11 comprises the switch with frequency range handoff functionality, and in addition, the first frequency range handover module 11 can be also power splitter, does not repeat them here.
The second frequency range handover module 13, for obtain the signal after frequency band filter is processed from radio-frequency filter 12, and exports to DPD processing module 14 by result; For example, the second frequency range handover module 13 is exported to DPD processing module 14 by the signal of the frequency range 1 after the frequency band filter processing of frequency range 1 correspondence.
In the embodiment of the present invention, this second frequency range handover module 13 comprises the switch with frequency range handoff functionality.
It should be noted that, in the embodiment of the present invention, can control radio-frequency filter 12 by above-mentioned the first frequency range handover module 11 and the second frequency range handover module 13 and carry out frequency range switching.
DPD processing module 14, the signal after processing for synchronous radio-frequency filter 12 each frequency band filters, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
In the embodiment of the present invention, because power amplifier support multiband is worked simultaneously, radio-frequency filter 12 is distinguished corresponding frequency band filter by the multiband that comprises of correspondence, take multiband as two frequency ranges be example, radio-frequency filter 12 radio-frequency filter 12 for comprising the first frequency band filter and the second frequency band filter; Execution mode based on these two frequency ranges, in above-mentioned each functional module:
The first frequency range handover module 11, specifically for the signal of the first frequency range being exported to the first frequency band filter in radio-frequency filter 12, and exports to the second frequency band filter in radio-frequency filter 12 by the signal of the second frequency range.
The second frequency range handover module 13, specifically for from obtaining the signal after the first frequency band filter is processed radio-frequency filter 12, exports to DPD processing module 14 by result; Afterwards, from obtaining the signal after the second frequency band filter is processed radio-frequency filter 12, result is exported to DPD processing module 14; Or, from obtaining the signal after the second frequency band filter is processed radio-frequency filter 12, result is exported to DPD processing module 14; Afterwards, from obtaining the signal after the first frequency band filter is processed radio-frequency filter 12, result is exported to DPD processing module 14.
DPD processing module 14, specifically for the signal after the first frequency band filter is processed and the signal after the second frequency band filter is processed in synchronous radio-frequency filter 12, and the signal based on after synchronous carries out DPD processing.
In the embodiment of the present invention, in the design process of radio-frequency filter 12, when the first frequency band signals bandwidth is BW1, when the second frequency band signals bandwidth is BW2, the band of the first frequency band filter is wider than the higher value in 3BW1 and BW1+2BW2; The band of the second frequency band filter is wider than the higher value in 3BW2 and BW2+2BW1.
In the embodiment of the present invention, for the signal that comprises different frequency range being exported to the first frequency range handover module 11, this DPD treatment facility also at least comprises power amplifier 15 and coupler 16; Wherein:
Power amplifier 15, for the signal of input is carried out to power amplification processing, and exports to coupler 16 by the signal after power amplification; Wherein, this power amplifier 15 supports multibands to work simultaneously, exports in the signal of coupler 16 and will comprise the signal of a plurality of frequency ranges.
Coupler 16, for sampling that the output signal of power amplifier 15 is coupled, and exports to the first frequency range handover module 11 by the result of coupling sampling; Wherein, the result of coupling sampling comprises the signal of different frequency range.
In the embodiment of the present invention, coupler 16 need to be to the sampling that is coupled of the output signal of power amplifier 15, this coupler 16 can adopt packaged device, also can pass through Design PCB (Printed Circuit Board, printed circuit board) microstrip line coupler and realize.
It should be noted that, for signal being exported to power amplifier 15, in DPD treatment facility, can also comprise: DAC, LPF, IQ modulator, amplifier; For the output of power amplifier 15, in DPD treatment facility, can also comprise: circulator; As shown in Figure 2, the function of each device, with existing identical, repeats no more in the embodiment of the present invention for the position of above-mentioned each device and annexation.
In the embodiment of the present invention, at the second frequency range handover module 13, result is exported in the process of DPD processing module 14, this DPD treatment facility can also at least comprise quadrature demodulator or frequency mixer 17, low pass filter 18, analog-digital converter ADC19; When the second frequency range handover module 13 is exported to DPD processing module 14 by result, first the second frequency range handover module 13 can export to result quadrature demodulator or frequency mixer 17.
Quadrature demodulator or frequency mixer 17, for the result of the second frequency range handover module 13 outputs is carried out to frequency-conversion processing, and export to low pass filter 18 by the signal after processing.
Low pass filter 18, for the signal of quadrature demodulator or frequency mixer 17 outputs is carried out to filtering processing, and exports to ADC19 by the signal after processing.
ADC19, for the signal of low pass filter 18 outputs is carried out to analog digital conversion, and exports to DPD processing module 14 by the signal after conversion.Wherein, this ADC19 includes but not limited to the ADC of 122.88Msps sampling rate.
In the embodiment of the present invention, in order to realize signal synchronizing process, DPD processing module 14, specifically for safeguarding corresponding training sequence at least two frequency band filters, signal after the training sequence of frequency band filter is processed to this frequency band filter carries out relevant, and obtain relevant position according to each autocorrelative peak value, and the signal after processing by least two frequency band filters in the synchronous radio-frequency filter of this relevant position.
Further, when radio-frequency filter 12 is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter, DPD processing module 14, is further used for safeguarding the training sequence of the first frequency range and the training sequence of the second frequency range; After the signal and the signal after the second frequency band filter is processed that obtain after the first frequency band filter is processed, utilize training sequence and the signal correction after the first frequency band filter is processed of the first frequency range, utilize training sequence and the signal correction after the second frequency band filter is processed of the second frequency range; And obtain relevant position according to each autocorrelative peak value, and by the signal after the first frequency band filter is processed in the synchronous radio-frequency filter of this relevant position and the signal after the second frequency band filter is processed.
In sum, in the embodiment of the present invention, by adopting frequency-division section timesharing to carry out the sampling of DPD feedback signal, effectively reduce the feedback sampling rate of ADC and the bandwidth of feedback path device, in existing device level, be issued to and can realize, thereby improved competitiveness; By adopting, launch multi-band signal training sequence, a certain frequency band signals that guaranteed to sample has comprised complete intermodulation distortion component simultaneously; By adopting the mode of quadrature demodulation and quadrature sampling, utilize orthogonal property to eliminate aliasing frequency, under same signal bandwidth, effectively reduce the speed of sampling ADC; By adopting relevant mode to realize the obtaining of synchronous and valid data of frequency-division section time sharing sampling signal, can effectively carry out DPD coefficient calculations.
Embodiment bis-
Based on above-described embodiment one, the embodiment of the present invention two provides a kind of DPD treatment facility based on multi-band frequency spectrum, in the present embodiment, take radio-frequency filter as comprising the radio-frequency filter of the first frequency band filter and the second frequency band filter, and the first frequency range is A frequency range, the second frequency range is that F-band is example, as shown in Figure 3, this DPD treatment facility comprises: DAC, LPF, IQ modulator (containing local oscillator), amplifier, power amplifier, coupler, circulator, the first switch (i.e. the first frequency range handover module), the radio-frequency filter that comprises A frequency band filter and F-band filter, second switch (i.e. the second frequency range handover module), quadrature demodulator (contains local oscillator, in practical application, can also be frequency mixer), LC filter, ADC, DPD processing module etc.In the processing embodiment of the present invention of above-mentioned DAC, LPF, IQ modulator, amplifier, circulator, repeat no more, for other functional modules:
(1) power amplifier, this power amplifier supports multiband to work simultaneously, in output signal, will comprise the signal of a plurality of frequency ranges, under this application scene, power amplifier supports A frequency range and F-band to work simultaneously, in output signal, comprises the signal of A frequency range and the signal of F-band.
(2) coupler, this coupler need to be to the sampling that is coupled of the output signal of power amplifier, and this coupler can adopt packaged device, also can realize by Design PCB microstrip line coupler.
(3) first switch and second switches, can control radio-frequency filter by the first switch and second switch and carry out frequency range switching, and the first switch also available power splitter substitutes, but many scene matchings debug difficulties.
(4) radio-frequency filter that comprises A frequency band filter and F-band filter, radio-frequency filter bandwidth and inhibition need to have many considerations: forward direction is the broadband signal across two-band, therefore forward link radio-frequency filter is difficult to design, does not adopt radio-frequency filter; For some the spuious and interference outside band, may disturb DPD or cause other abnormal frequency component, need to there be enough inhibition; In addition, also have forward direction local oscillator, the inhibition of mirror image etc. all needs to satisfy the demands; Consider that bandwidth will meet frequency-division section and adopt the 3 above intermodulation components in rank (relevant with the algorithm model adopting, as adopted 5 rank distortions in model, it is best that bandwidth meets 5 rank, and originally sentencing 3 rank models is example) simultaneously, will have enough inhibition to other frequency range simultaneously; In the design, F-band signal bandwidth is expressed as BWF, and A band bandwidth is BWA, and F-band filter bandwidht is greater than value larger in 3BWF and BWF+2BWA; A frequency band filter band is wider than 3BWA and BWA+2BWF; If the consideration in addition of 5 rank models does not repeat them here.
(5) quadrature demodulator, by adopting quadrature demodulator and quadrature sampling, and utilizes orthogonality to remove aliasing; Can adopt zero-if architecture and low intermediate frequency structure; Zero-if architecture need to add direct current algorithm.
(6) LC filter, needs to calculate bandwidth and the Out-of-band rejection that coordinates radio-frequency filter.
(7) ADC, the sampling bandwidth needing according to the exponent number of model, because adopting orthogonal modes, sample frequency Fs only need to take a times of sampling bandwidth to, therefore, can adopt in the present invention the ADC of 122.88Msps sampling rate simultaneously.
It should be noted that, in the embodiment of the present invention, can be by sampling rate and the feedback filter bandwidth of following Techniques For Reducing ADC: (1), in conjunction with DPD algorithm model, two-band time sharing sampling, as long as the bandwidth of at this moment sampling reaches 3 ~ 5 times of certain in-band signal bandwidth.(2) adopt quadrature demodulation and quadrature sampling, by quadrature Q road, eliminate aliasing, make sampling rate meet 1 times of bandwidth.(3) the synchronous and valid data of the two-band signal of time sharing sampling obtain by correlation technique and obtain DPD coefficient calculations desired data.(4) for guaranteeing the integrality of intermodulation predistortion component, the multiple-frequency signal of descending training sequence signal transmitting all working frequency band.
In the embodiment of the present invention, because power amplifier is wideband, F, two frequency range downstream signals of A are from same power amplifier, to send simultaneously, and forward signal two-band is synchronous.When frequency-division section is sampled, need to realize DPD coefficient calculations, the different frequency range of feedback signal also needs to find synchronous valid data, otherwise DPD coefficient is by inaccurate.In the embodiment of the present invention, take F and A two-band is example, and the collection of feedback data and synchronous method and flow process comprise:
(1) internal system storage F training sequence and A training sequence, and trigger transmitting F training sequence and A training sequence.
(2) system issues triggering signal, and operation gathers F-band and A frequency range feedback signal; And obtain F-band Low Medium Frequency feedback signal and A frequency range Low Medium Frequency feedback signal.
It should be noted that this process is in embodiment mono-mutual by each functional module, by signal and the signal after F-band filter process after A frequency band filter is processed, is sent to the process of DPD processing module.
(3) relevant to F-band feedback signal with F-band training signal, relevant to A frequency range feedback signal with A frequency range training signal, and according to each autocorrelation peak judgement relevant position, take out valid data.As shown in Figure 4, for synchronous after two-band signals collecting and take out the schematic diagram of valid data, wherein, in Fig. 4, valid data are DAT_LEN.
Afterwards, in the embodiment of the present invention, can be according to training sequence and feedback signal, in conjunction with DPD model, calculate pre-distortion coefficients, therefore, the distorted signal that can realize after power amplifier samples through feedback path, carries out DPD coefficient calculations with forward signal, and offer the use of forward direction DPD processing module, complete DPD compensation; This process repeats no more.
In sum, in the embodiment of the present invention, because power amplifier support multiband is worked simultaneously, by the algorithm model in conjunction with developing voluntarily, the intermodulation nonlinear component of different frequency range is considered respectively the impact of a certain frequency range in model, different frequency range time sharing sampling be can adopt, and then sampling bandwidth and the requirement of ADC sampling rate reduced; Solved the stationary problem of different frequency range time sharing sampling simultaneously; In order to guarantee the complete collection of intermodulation distortion component, training sequence is to launch the multi-band signal needing simultaneously, guarantees that a certain frequency band signals of sampling has comprised complete intermodulation distortion component.
In the embodiment of the present invention, based on realize multiband discontinuous signal DPD feedback sample compared with low rate ADC; In conjunction with DPD algorithm model, multiband time sharing sampling, as long as sampling bandwidth reaches 3 ~ 5 times of certain in-band signal bandwidth, effectively reduces ADC sampling rate and feedback device bandwidth; By adopting quadrature demodulation and quadrature sampling, by quadrature Q road, eliminate aliasing, make sampling rate meet 1 times of bandwidth, reduce sampling rate, improve transmission quality; By adopting, launch multi-band signal training sequence, a certain frequency band signals that guaranteed to sample has comprised complete intermodulation distortion component simultaneously; Synchronous and the valid data position of the two-band signal by time sharing sampling obtains DPD coefficient calculations desired data by correlation technique.
Embodiment tri-
Inventive concept based on same with the said equipment, a kind of digital pre-distortion DPD processing method based on multi-band frequency spectrum is also provided in the embodiment of the present invention, the method is applied to comprise in the DPD treatment facility of the first frequency range handover module, the radio-frequency filter that comprises at least two frequency band filters, the second frequency range handover module and DPD processing module, as shown in Figure 5, the method at least comprises the following steps:
Step 501, the first frequency range handover module is exported to the signal of different frequency range respectively the frequency band filter of corresponding frequency band in radio-frequency filter.
Step 502, the second frequency range handover module is from obtaining the signal after frequency band filter is processed radio-frequency filter, and result is exported to DPD processing module.
Step 503, the signal in the synchronous radio-frequency filter of DPD processing module after each frequency band filter processing, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
In the embodiment of the present invention, this radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter; For above-mentioned steps 501-step 503, described method further comprises:
The first frequency range handover module is exported to the first frequency band filter in radio-frequency filter by the signal of the first frequency range, and the signal of the second frequency range is exported to the second frequency band filter in radio-frequency filter;
The second frequency range handover module, from obtaining the signal after the first frequency band filter is processed radio-frequency filter, is exported to DPD processing module by result; From obtaining the signal after the second frequency band filter is processed radio-frequency filter, result is exported to DPD processing module; Or, from obtaining the signal after the second frequency band filter is processed radio-frequency filter, result is exported to DPD processing module; From obtaining the signal after the first frequency band filter is processed radio-frequency filter, result is exported to DPD processing module;
Signal in the synchronous radio-frequency filter of DPD processing module after the first frequency band filter is processed and the signal after the second frequency band filter is processed, and the signal based on after synchronous carries out DPD processing.
In the embodiment of the present invention, when the first frequency band signals bandwidth is BW1, when the second frequency band signals bandwidth is BW2, the band of the first frequency band filter is wider than the higher value in 3BW1 and BW1+2BW2; The band of the second frequency band filter is wider than the higher value in 3BW2 and BW2+2BW1.
This DPD treatment facility also at least comprises power amplifier and coupler; In the embodiment of the present invention, the frequency band filter of corresponding frequency band in the first frequency range handover module is exported to radio-frequency filter respectively by the signal of different frequency range also comprises before:
Power amplifier carries out power amplification processing to the signal of input, and the signal after power amplification is exported to coupler; Coupler is to the sampling that is coupled of the output signal of power amplifier, and the result of coupling sampling is exported to the first frequency range handover module;
Wherein, the result of coupling sampling comprises the signal of different frequency range.
This DPD treatment facility also at least comprises quadrature demodulator or frequency mixer, low pass filter, analog-digital converter ADC; In the embodiment of the present invention, the second frequency range handover module is exported to DPD processing module by result and is comprised:
The second frequency range handover module is exported to quadrature demodulator or frequency mixer by result;
Quadrature demodulator or frequency mixer carry out frequency-conversion processing to the result of the second frequency range handover module output, and the signal after processing is exported to low pass filter;
Low pass filter carries out filtering processing to the signal of quadrature demodulator or frequency mixer output, and the signal after processing is exported to ADC;
ADC carries out analog digital conversion to the signal of low pass filter output, and the signal after conversion is exported to DPD processing module.
In the embodiment of the present invention, ADC comprises the ADC of 122.88Msps sampling rate.
The first frequency range handover module comprises the switch with frequency range handoff functionality; The second frequency range handover module comprises the switch with frequency range handoff functionality.
In the embodiment of the present invention, signal in the synchronous radio-frequency filter of DPD processing module after each frequency band filter processing comprises: DPD processing module is safeguarded corresponding training sequence at least two frequency band filters, signal after the training sequence of frequency band filter is processed to this frequency band filter carries out relevant, and obtain relevant position according to each autocorrelative peak value, and the signal after processing by least two frequency band filters in the synchronous radio-frequency filter of this relevant position.
In the embodiment of the present invention, radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter; Signal in the synchronous radio-frequency filter of DPD processing module after each frequency band filter processing comprises: DPD processing module is safeguarded the training sequence of the first frequency range and the training sequence of the second frequency range; After the signal and the signal after the second frequency band filter is processed that obtain after the first frequency band filter is processed, utilize training sequence and the signal correction after the first frequency band filter is processed of the first frequency range, utilize training sequence and the signal correction after the second frequency band filter is processed of the second frequency range; And obtain relevant position according to each autocorrelative peak value, and by the signal after the first frequency band filter is processed in the synchronous radio-frequency filter of this relevant position and the signal after the second frequency band filter is processed.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (16)
1. the digital pre-distortion DPD treatment facility based on multi-band frequency spectrum, it is characterized in that, described DPD treatment facility at least comprises: the first frequency range handover module, the radio-frequency filter that comprises at least two frequency band filters, the second frequency range handover module and DPD processing module; Wherein: described radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter;
Described the first frequency range handover module, for exporting to the signal of different frequency range respectively the frequency band filter of described radio-frequency filter corresponding frequency band; Specifically for the signal of the first frequency range being exported to the first frequency band filter in described radio-frequency filter, and the signal of the second frequency range is exported to the second frequency band filter in described radio-frequency filter; When the first frequency band signals bandwidth is BW1, when the second frequency band signals bandwidth is BW2, the band of described the first frequency band filter is wider than the higher value in 3BW1 and BW1+2BW2; The band of described the second frequency band filter is wider than the higher value in 3BW2 and BW2+2BW1;
Described the second frequency range handover module, for obtain the signal after frequency band filter is processed from described radio-frequency filter, and exports to described DPD processing module by result;
Described DPD processing module, the signal after processing for each frequency band filter of synchronous described radio-frequency filter, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
2. equipment as claimed in claim 1, is characterized in that,
Described the second frequency range handover module, specifically for from obtaining the signal after the first frequency band filter is processed described radio-frequency filter, exports to described DPD processing module by result; From obtaining the signal after the second frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module; Or, from obtaining the signal after the second frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module; From obtaining the signal after the first frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module;
Described DPD processing module, specifically for the signal after the first frequency band filter is processed in synchronous described radio-frequency filter and the signal after the second frequency band filter is processed, and the signal based on after synchronous carries out DPD processing.
3. equipment as claimed in claim 1 or 2, is characterized in that, described DPD treatment facility also at least comprises power amplifier and coupler;
Described power amplifier, for the signal of input is carried out to power amplification processing, and exports to described coupler by the signal after power amplification;
Described coupler, for sampling that the output signal of described power amplifier is coupled, and exports to described the first frequency range handover module by the result of coupling sampling; Wherein, the result of described coupling sampling comprises the signal of described different frequency range.
4. equipment as claimed in claim 1 or 2, is characterized in that, described DPD treatment facility also at least comprises quadrature demodulator or frequency mixer, low pass filter, analog-digital converter ADC;
At described the second frequency range handover module, result is exported in the process of described DPD processing module, described the second frequency range handover module is exported to described quadrature demodulator or frequency mixer by result;
Described quadrature demodulator or frequency mixer, for the result of described the second frequency range handover module output is carried out to frequency-conversion processing, and export to described low pass filter by the signal after processing;
Described low pass filter, for the signal of described quadrature demodulator or frequency mixer output is carried out to filtering processing, and exports to described ADC by the signal after processing;
Described ADC, for the signal of described low pass filter output is carried out to analog digital conversion, and exports to described DPD processing module by the signal after conversion.
5. equipment as claimed in claim 4, is characterized in that, described ADC comprises the ADC of 122.88Msps sampling rate.
6. equipment as claimed in claim 1 or 2, is characterized in that, described the first frequency range handover module comprises the switch with frequency range handoff functionality;
Described the second frequency range handover module comprises the switch with frequency range handoff functionality.
7. equipment as claimed in claim 1, is characterized in that,
Described DPD processing module, specifically for safeguarding corresponding training sequence for described at least two frequency band filters, signal after the training sequence of frequency band filter is processed to this frequency band filter carries out relevant, and obtain relevant position according to each autocorrelative peak value, and the signal after processing by least two frequency band filters described in the synchronous described radio-frequency filter of this relevant position.
8. equipment as claimed in claim 7, is characterized in that, described radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter;
Described DPD processing module, is further used for safeguarding the training sequence of the first frequency range and the training sequence of the second frequency range; After the signal and the signal after the second frequency band filter is processed that obtain after the first frequency band filter is processed, utilize training sequence and the signal correction after the first frequency band filter is processed of the first frequency range, utilize training sequence and the signal correction after the second frequency band filter is processed of the second frequency range; And obtain relevant position according to each autocorrelative peak value, and by the signal after the first frequency band filter is processed in the synchronous described radio-frequency filter of this relevant position and the signal after the second frequency band filter is processed.
9. the digital pre-distortion DPD processing method based on multi-band frequency spectrum, it is characterized in that, the method is applied to comprise in the DPD treatment facility of the first frequency range handover module, the radio-frequency filter that comprises at least two frequency band filters, the second frequency range handover module and DPD processing module, wherein, described radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter, and the method at least comprises the following steps:
Described the first frequency range handover module is exported to the signal of different frequency range respectively the frequency band filter of corresponding frequency band in described radio-frequency filter; Wherein, described the first frequency range handover module is exported to the first frequency band filter in described radio-frequency filter by the signal of the first frequency range, and the signal of the second frequency range is exported to the second frequency band filter in described radio-frequency filter; When the first frequency band signals bandwidth is BW1, when the second frequency band signals bandwidth is BW2, the band of described the first frequency band filter is wider than the higher value in 3BW1 and BW1+2BW2; The band of described the second frequency band filter is wider than the higher value in 3BW2 and BW2+2BW1;
Described the second frequency range handover module is from obtaining the signal after frequency band filter is processed described radio-frequency filter, and result is exported to described DPD processing module;
Signal in the synchronous described radio-frequency filter of described DPD processing module after each frequency band filter processing, and the signal after each frequency band filter processing based on after synchronous carries out DPD processing.
10. method as claimed in claim 9, is characterized in that, described method further comprises:
Described the second frequency range handover module, from obtaining the signal after the first frequency band filter is processed described radio-frequency filter, is exported to described DPD processing module by result; From obtaining the signal after the second frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module; Or, from obtaining the signal after the second frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module; From obtaining the signal after the first frequency band filter is processed described radio-frequency filter, result is exported to described DPD processing module;
Signal in the synchronous described radio-frequency filter of described DPD processing module after the first frequency band filter is processed and the signal after the second frequency band filter is processed, and the signal based on after synchronous carries out DPD processing.
11. methods as described in claim 9 or 10, is characterized in that, described DPD treatment facility also at least comprises power amplifier and coupler; Described the first frequency range handover module is exported to the signal of different frequency range respectively the frequency band filter of corresponding frequency band in described radio-frequency filter, also comprises before:
Described power amplifier carries out power amplification processing to the signal of input, and the signal after power amplification is exported to described coupler;
Described coupler is to the sampling that is coupled of the output signal of described power amplifier, and the result of coupling sampling is exported to described the first frequency range handover module; Wherein, the result of described coupling sampling comprises the signal of described different frequency range.
12. methods as described in claim 9 or 10, is characterized in that, described DPD treatment facility also at least comprises quadrature demodulator or frequency mixer, low pass filter, analog-digital converter ADC; Described the second frequency range handover module is exported to described DPD processing module by result, comprising:
Described the second frequency range handover module is exported to described quadrature demodulator or frequency mixer by result;
Described quadrature demodulator or frequency mixer carry out frequency-conversion processing to the result of described the second frequency range handover module output, and the signal after processing is exported to described low pass filter;
Described low pass filter carries out filtering processing to the signal of described quadrature demodulator or frequency mixer output, and the signal after processing is exported to described ADC;
Described ADC carries out analog digital conversion to the signal of described low pass filter output, and the signal after conversion is exported to described DPD processing module.
13. methods as claimed in claim 12, is characterized in that, described ADC comprises the ADC of 122.88Msps sampling rate.
14. methods as described in claim 9 or 10, is characterized in that, described the first frequency range handover module comprises the switch with frequency range handoff functionality;
Described the second frequency range handover module comprises the switch with frequency range handoff functionality.
15. methods as claimed in claim 9, is characterized in that, the signal in the synchronous described radio-frequency filter of described DPD processing module after each frequency band filter processing, comprising:
Described DPD processing module is that described at least two frequency band filters are safeguarded corresponding training sequence, signal after the training sequence of frequency band filter is processed to this frequency band filter carries out relevant, and obtain relevant position according to each autocorrelative peak value, and the signal after processing by least two frequency band filters described in the synchronous described radio-frequency filter of this relevant position.
16. methods as claimed in claim 15, is characterized in that, described radio-frequency filter is the radio-frequency filter that comprises the first frequency band filter and the second frequency band filter; Signal in the synchronous described radio-frequency filter of described DPD processing module after each frequency band filter processing, comprising:
Described DPD processing module is safeguarded the training sequence of the first frequency range and the training sequence of the second frequency range; After the signal and the signal after the second frequency band filter is processed that obtain after the first frequency band filter is processed, utilize training sequence and the signal correction after the first frequency band filter is processed of the first frequency range, utilize training sequence and the signal correction after the second frequency band filter is processed of the second frequency range; And obtain relevant position according to each autocorrelative peak value, and by the signal after the first frequency band filter is processed in the synchronous described radio-frequency filter of this relevant position and the signal after the second frequency band filter is processed.
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| CN105099396B (en) * | 2015-05-22 | 2020-10-16 | 深圳迈瑞生物医疗电子股份有限公司 | Filter switching method and device and medical equipment |
| WO2018157321A1 (en) * | 2017-02-28 | 2018-09-07 | 华为技术有限公司 | Transmitter and digital pre-distortion calibration method |
| CN109756238A (en) * | 2017-11-08 | 2019-05-14 | 中兴通讯股份有限公司 | A kind of processing method and processing device of multi-band signal |
| CN108900207B (en) * | 2018-08-29 | 2020-03-13 | 京信通信系统（中国）有限公司 | Power amplifier device, radio frequency signal processing system and base station |
| WO2022032579A1 (en) * | 2020-08-13 | 2022-02-17 | 华为技术有限公司 | Transmitter system and electronic device |
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