CN104601511A - Multi-rate peak clipping method and device - Google Patents
Multi-rate peak clipping method and device Download PDFInfo
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- CN104601511A CN104601511A CN201410837819.3A CN201410837819A CN104601511A CN 104601511 A CN104601511 A CN 104601511A CN 201410837819 A CN201410837819 A CN 201410837819A CN 104601511 A CN104601511 A CN 104601511A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2623—Reduction thereof by clipping
- H04L27/2624—Reduction thereof by clipping by soft clipping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L5/0001—Arrangements for dividing the transmission path
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Abstract
The invention discloses a multi-rate peak clipping method and device. The multi-rate peak clipping method includes that a multi-rate peak clipping device uses a preset first speed rate peak clipping threshold and a preset first peak clipping coefficient to carry out primary digital peak clipping on a multi-carrier superposed signal after performing multi-carrier superposition; the multi-rate peak clipping device uses a preset second speed rate peak clipping threshold and a preset second peak clipping coefficient to carry out secondary digital peak clipping on an interpolated signal after performing signal interpolation. According to the embodiment, the multi-rate peak clipping mode is used for clipping signal peaks, the signal peak recurrence after interpolation can be avoided, the peak clipping effect is good, the peak clipping hardware resource can be saved, the peak clipping performance is improved, and the problems of large peak lifting, peak regeneration, signal quality degradation and the like after the multi-carrier superposition can be solved. The multi-rate peak clipping mode clips large-peak signals through low-speed peak clipping, and the peaks of the reserved small-peak signals are clipped in a high speed in subsequent.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of Multirate despicking method and device.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) multicarrier system employing orthogonal frequency channel, can when not needing complicated balancing technique, support speed wireless data transfer, and there is very strong anti-fading and anti-ISI (Inter Symbol Interference, intersymbol interference) ability, but the topmost shortcoming of ofdm system has larger PAPR (Peak toAverage Power Ratio, papr, be called for short peak-to-average force ratio), peak-to-average force ratio directly affects operating cost and the efficiency of whole system, peak-to-average force ratio problem is a ubiquitous problem in multi-carrier modulation.
In order to overcome the excessive problem of peak-to-average force ratio, propose the algorithm that many peak values eliminate in prior art, to circulate, limit filtration algorithm and subcarrier retain the commonplace of the use of algorithm.Wherein, circulation limit filtration algorithm belongs to amplitude limit class technology, its realization is comparatively simple, namely direct amplitude limit is carried out to too high peak value, be Nonlinear Processing, in-band noise and the outer interference of band can be produced, and need to carry out the outer clipped noise of cancellation band by filtering, but filtered signal can cause peak regeneration again, and be much smaller than the signal peak before amplitude limit.Subcarrier retains algorithm and does not need to transmit side information, and do not introduce band internal and external interference, its complexity is lower and do not sacrifice spectrum efficiency, but can produce interference in all available carrier wave.
In prior art, general employing first-rate peak clipping mode, but first-rate peak clipping mode is difficult to signal peak all to eliminate, and signal peak after interpolation can recur.
Summary of the invention
Embodiments provide a kind of Multirate despicking method and device, to adopt the mode of Multirate peak clipping to be eliminated by signal peak, and the signal peak recurrence after can interpolation being avoided.
The embodiment of the present invention provides a kind of Multirate despicking method, said method comprising the steps of:
Multirate peak cutting device, after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition;
Described Multirate peak cutting device, after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
Described method comprises further: described Multirate peak cutting device is after the second speed peak clipping thresholding is preset in utilization and default second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before carrying out digital pre-distortion DPD process to signal, described Multirate peak cutting device utilizes to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and carries out third level digital despicking to DPD signal before treatment.
Described default first despiking coefficient that described Multirate peak cutting device uses, described default second despiking coefficient, described the 3rd despiking coefficient of presetting are specially: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.The first peak clipping speed of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peak clipping speed that the signal after to interpolation carries out second level digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed of DPD signal before treatment being carried out to third level digital despicking.Signal after multicarrier superposition is carried out to the first peak value detection window of first order digital despicking is long to be less than the signal after to interpolation to carry out the second peakvalue's checking window of second level digital despicking long; Signal after interpolation is carried out to the second peakvalue's checking window of second level digital despicking is long is less than that to carry out the 3rd peakvalue's checking window of third level digital despicking to DPD signal before treatment long.
The embodiment of the present invention provides a kind of Multirate peak cutting device, and described Multirate peak cutting device comprises:
First processing module, for after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition;
Second processing module, for after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
Also comprise: the 3rd processing module, preset the second speed peak clipping thresholding for utilizing in described second processing module and preset after the second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before digital pre-distortion DPD process is carried out to signal, utilize to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and third level digital despicking is carried out to DPD signal before treatment.
Described default first despiking coefficient, described default second despiking coefficient, described the 3rd despiking coefficient of presetting are specially: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.The first peak clipping speed of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peak clipping speed that the signal after to interpolation carries out second level digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed of DPD signal before treatment being carried out to third level digital despicking.
The first peak value detection window length of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peakvalue's checking window length that the signal after to interpolation carries out second level digital despicking; The second peakvalue's checking window length of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peakvalue's checking window length of DPD signal before treatment being carried out to third level digital despicking.
Compared with prior art, the embodiment of the present invention at least has the following advantages: in the embodiment of the present invention, Multirate peak clipping mode is adopted to be eliminated by signal peak, signal peak recurrence after can avoiding interpolation, peak clipping effect is better, and can save the hardware resource of peak clipping process, improves the performance of peak clipping process, and the problems such as after can solving multicarrier superposition, peak value lifting is comparatively large, peak regeneration, signal quality deteriorates.Further, aforesaid way eliminates large peak signal by low speed peak clipping, and the small leak signal carried over is subsequently by high speed peak clipping.Aforesaid way can self-adaptative adjustment peakvalue's checking window length, has larger improvement like this to DPD (Digital Pre-Distortion, digital pre-distortion) effect.
Accompanying drawing explanation
In order to the technical scheme of the embodiment of the present invention is clearly described, below the accompanying drawing used required in describing the embodiment of the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings of the embodiment of the present invention.
Fig. 1 is a kind of Multirate despicking method schematic flow sheet that the embodiment of the present invention one proposes;
Fig. 2 is the handling process schematic diagram of three digital despickings that the embodiment of the present invention one proposes;
Fig. 3 is the process structural representation of the Multirate peak cutting device that the embodiment of the present invention one proposes;
Fig. 4 calls the schematic diagram that CFR peak-clipping module carries out first order digital despicking, second level digital despicking, third level digital despicking under the different rates proposed in the embodiment of the present invention;
Fig. 5 is the schematic diagram that the sharp-pointed pulse expansion proposed in the embodiment of the present invention inserts carrier wave transition band;
Fig. 6 A is the schematic diagram of the poop coefficient peak cutting device proposed in the embodiment of the present invention; Fig. 6 B is the poop expansion peak clipping filter coefficient spectrum diagram that the 122.88MSPS speed of the 80MHZ bandwidth proposed in the embodiment of the present invention is little; Fig. 6 C is poop expansion peak clipping filter coefficient frequency spectrum (enlarged tip sharp pulse) schematic diagram of the 80MHZ bandwidth 122.88MSPS speed proposed in the embodiment of the present invention; Fig. 6 D is the 80MHZ bandwidth 122.88MSPS speed poop expansion peak clipping filter coefficient temporal amplitude schematic diagram proposed in the embodiment of the present invention; Fig. 6 E is the spectrum diagram after the poop expansion peak clipping proposed in the embodiment of the present invention; Fig. 6 F is the signal quality measurement result EVM schematic diagram after the poop expansion peak clipping proposed in the embodiment of the present invention; Fig. 6 G is 80MHZ bandwidth 122.88MSPS speed peak clipping filter coefficient frequency spectrum (routine) schematic diagram proposed in the embodiment of the present invention; Fig. 6 H is 80MHZ bandwidth 122.88MSPS speed peak clipping filter coefficient temporal amplitude figure (routine) schematic diagram proposed in the embodiment of the present invention; Fig. 6 I is signal spectrum (routine) schematic diagram before and after the 80MHZ bandwidth 122.88MSPS speed peak clipping that proposes in the embodiment of the present invention; Fig. 6 J is the signal quality measurement result EVM schematic diagram after the normal despiking coefficient peak clipping proposed in the embodiment of the present invention;
Fig. 7 A is the schematic diagram of CCDF before and after the first order peak clipping that proposes in the embodiment of the present invention;
Fig. 7 B is the schematic diagram of temporal amplitude before and after the first order peak clipping that proposes in the embodiment of the present invention;
Fig. 7 C is the schematic diagram of CCDF before and after the second level peak clipping that proposes in the embodiment of the present invention;
Fig. 7 D is the schematic diagram of temporal amplitude before and after the second level peak clipping that proposes in the embodiment of the present invention;
Fig. 8 is a kind of Multirate peak cutting device structural representation that the embodiment of the present invention two proposes.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
For problems of the prior art, the embodiment of the present invention one provides a kind of Multirate despicking method, and as shown in Figure 1, this Multirate despicking method specifically can comprise the following steps:
Step 101, Multirate peak cutting device, after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition.
Step 102, Multirate peak cutting device, after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
Step 103, Multirate peak cutting device, before carrying out DPD process to signal, utilizes to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and carries out third level digital despicking to DPD signal before treatment.In the embodiment of the present invention, Multirate peak cutting device is preset the second speed peak clipping thresholding in utilization and is preset after the second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before carrying out digital pre-distortion DPD process to signal, Multirate peak cutting device utilizes to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and carries out third level digital despicking to DPD signal before treatment.
Wherein, preset first rate peak clipping thresholding, preset the first despiking coefficient, preset the second speed peak clipping thresholding, preset the second despiking coefficient, preset third speed peak clipping thresholding, preset the 3rd despiking coefficient, all can arrange according to practical experience value, repeat no more in the concrete set-up mode embodiment of the present invention.
In a kind of preferred implementation of the embodiment of the present invention, default first despiking coefficient that Multirate peak cutting device uses, default second despiking coefficient, default 3rd despiking coefficient are specifically as follows: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.Further, the second peak clipping speed (i.e. medium-rate) that the signal after to interpolation carries out second level digital despicking is less than to the first peak clipping speed (i.e. low rate) that the signal after multicarrier superposition carries out first order digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed (i.e. two-forty) of DPD signal before treatment being carried out to third level digital despicking.Further, the second peakvalue's checking window length that the signal after to interpolation carries out second level digital despicking is less than to the first peak value detection window length that the signal after multicarrier superposition carries out first order digital despicking; The second peakvalue's checking window length of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peakvalue's checking window length of DPD signal before treatment being carried out to third level digital despicking.
Along with the rise of multi-carrier polymerizing technology, wideband RRU (Radio Remote Unit, far-end RF module) multi-carrier polymerizing technology comprise following scheme: the expansion scheme of (1) one-segment bandwidth of operation, such as, expand to 40 ~ 60MHz from current supported 30MHz bandwidth of operation; (2) multiband adopts single across section power amplifier mode.For LTE (Long Term Evolution, Long Term Evolution) system, LTE-TDD (Time Division Duplexing, time division duplex) system only supports 20MHZ signal, if need the frequency range supporting continuous 50MHZ, the compound mode of communication system has various modes, a kind of common schema is that multiple 20MHZ LTE signal is after completing multicarrier superposition, intermediate-freuqncy signal speed reaches 122.88MHZ, and then carrying out the interpolation filtering of afterbody of multi-carrier signal, the interpolation filtering of this afterbody generally adopts the HB filter of 2 times.Based on above-mentioned application scenarios, in the embodiment of the present invention, the wideband frequency range peak clipping of indication is: for one-segment bandwidth of operation 40 ~ 60MHz system that expands to eliminate process.
In order to solve peak clipping in prior art, EVM (Error Vector Magnitude, error vector) being worsened, the problem of peak regeneration, as shown in Figure 2, is the handling process schematic diagram of three digital despickings that the embodiment of the present invention proposes.The treatment principle of Multirate peak clipping comprises: after multicarrier superposition, Multirate peak cutting device carries out first order digital despicking.After interpolation, Multirate peak cutting device carries out second level digital despicking.Before DPD, Multirate peak cutting device can carry out third level digital despicking.Such as, the signal rate after multicarrier superposition be the processing speed of 122.88MHZ, DPD if 491.52MHz, then can carry out 3 digital despickings, namely perform first order digital despicking, second level digital despicking and third level digital despicking.Further, as shown in Figure 3, be the process structural representation of the Multirate peak cutting device that the embodiment of the present invention proposes, this Fig. 3 illustrates the process block diagram of 40MHZ signal two-stage digital peak clipping, first order peak clipping speed is 122.88MHZ, and second level peak clipping speed is 245.76MHZ.
Signal is being carried out in the process of first order digital despicking, second level digital despicking, third level digital despicking, Based PC-CFR (Peak Cancellation-Crest Factor Reduction, peak value offset reduces crest factor) algorithm carries out digital despicking process.PC-CFR algorithm is by finding peak power point, carrying out pulse to cutting to peak power point.As shown in Figure 4, call under the different rates that proposes in the embodiment of the present invention schematic diagram that CFR peak-clipping module carries out first order digital despicking, second level digital despicking, third level digital despicking.Wherein, CFR peak-clipping module mainly completes and carries out peak clipping process to inside higher than the signal of threshold value, reduces the average power of signal, suppresses further to noise.The function of the inner submodule of CFR peak-clipping module is as follows: (1) DELAY (time delay) module: because the link producing peak clipping sequence has constant time lag, this DELAY module is for completing the constant time lag of input data, keep identical with the time required for the peak clipping sequence produced, finally synchronously input subtraction block.(2) PEAK_DETECT (blob detection) module: the detection module of peak point, all parts higher than threshold value all carry out peak value differentiation.(3) PEAK_SCALING (peak convergent-divergent) module: α=(| x|-γ) exp (j θ), | X| is the peak value sequence detected, γ is threshold value, θ=angle (x).(4) PEAK_ALLOCATOR (peak distribution) module: peak allocation module, by each peak allocation CPG (peak clipping pulse generator) module detected.(5) CPG module: peak clipping pulses generation module, store the peak clipping sequence of regular length, each CPG module once can only process a peak point, once be in idle condition, PEAK_ALLOCATOR module will distribute a peak value to idle CPG resume module, if all CPG modules all without idle, then all can not carry out the peak process that disappears for the peak point next detected.A CPG module needs a complex multiplier (i.e. 4 multipliers), clock rate if 4 times of signal transacting speed, then these 4 multiplier time-sharing multiplexs.So complex multiplier can complete the operation of 4 CPG modules.(6) SUM (summation) module: the output of all CPG modules be added, forms peak clipping sequence.(7) SUBTRACT (subtraction) module: by using primary signal after DELAY module, deduct the peak clipping sequence of SUM module generation, the structure of gained is exactly the final Output rusults of CFR module.
Further, the signal being input to CFR peak-clipping module is the high peak-to-average power ratio signal after the superposition of a kind of multicarrier:
wherein, the signal amplitude of what A (n, k) described is the n-th sampled point of a kth carrier wave,
what describe is frequency and the phase place of single-carrier signal in multicarrier frequency band.Based on formula
along with the increase of carrier number or bandwidth, signal PAR will be larger.Peak clipping process be to multicarrier superposition after signal unify peak clipping, therefore above formula is
can find out, for the PAR reducing signal, can there are three kinds of modes by carrying out inspection to this model, first kind of way is the signal amplitude A to revising after multicarrier superposition
m_carrn () is revised, make PAR minimum, and this selection is considered to amplitude limit, but to A
m_carrn the correction of () makes signal produce range error EVM.The second way is to carrier frequency ω
kadjust, but frequency adjustment can produce frequency error.The third mode is the phase place to each carrier wave
adjust, although this mode can not worsen EVM, PAR reduces limited and amount of calculation is large.Therefore, in the embodiment of the present invention, adopt the method (i.e. first kind of way) of amplitude limit to reduce the PAR of signal, but need to reduce amplitude limit to the impact of the deterioration of signal quality.
Based on above-mentioned analysis, in the embodiment of the present invention, despiking coefficient adopts the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.Concrete, in order to reduce the impact of amplitude limit on the deterioration of signal quality, adopting the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse, to increase band stray frequently, alleviating the noise in band frequency, being equivalent to alleviate the deterioration of EVM in frequency band.As shown in Figure 5, for sharp-pointed pulse expansion inserts the schematic diagram of two carrier wave transition bands.Test 4 20MHZ carrier signals of LTE below, contrast sharp signal adds front and back EVM and contrasts situation.As shown in Figure 6A, be the schematic diagram of poop coefficient peak cutting device.As shown in Figure 6B, for peak clipping filter coefficient spectrum diagram is expanded in the poop that the 122.88MSPS speed of 80MHZ bandwidth is little.As shown in Figure 6 C, be poop expansion peak clipping filter coefficient frequency spectrum (enlarged tip sharp pulse) schematic diagram of 80MHZ bandwidth 122.88MSPS speed.As shown in Figure 6 D, be 80MHZ bandwidth 122.88MSPS speed poop expansion peak clipping filter coefficient temporal amplitude schematic diagram.As illustrated in fig. 6e, be the spectrum diagram after poop expansion peak clipping.As fig 6 f illustrates, be the signal quality measurement result EVM schematic diagram after poop expansion peak clipping.As shown in Figure 6 G, be 80MHZ bandwidth 122.88MSPS speed peak clipping filter coefficient frequency spectrum (routine) schematic diagram.As shown in figure 6h, be 80MHZ bandwidth 122.88MSPS speed peak clipping filter coefficient temporal amplitude figure (routine) schematic diagram.As shown in fig. 6i, be signal spectrum (routine) schematic diagram before and after the peak clipping of 80MHZ bandwidth 122.88MSPS speed.As shown in Fig. 6 J, it is the signal quality measurement result EVM schematic diagram after normal despiking coefficient peak clipping.By above-mentioned a series of test, the visible poop adopting the embodiment of the present invention to provide is to turning device, and signal quality EVM can improve 1%.
In Multirate peak clipping mode, for every stage speed peak clipping, the peak clipping of the CPG8 of 1 joint or more piece can be adopted.Peak clipping improvement below for Multirate (first order speed 122.88MHZ adopts the peak clipping of 2 joint CPG8, and second level speed 245.76MHZ adopts the peak clipping of 1 joint CPG8) is described in detail.Such as, primary signal 80MHZ, the original PAR=12 of signal, peak value eliminates close to 5dBc.Under this application scenarios, peak clipping CCDF (Complementary Cumulative Distribution Function, CCDF) equals 7.1dBc to PAR_avg0.01%, and EVM equals 4.3%.(peak clipping that first-rate 122.88MHZ adopts 3 joint CPG8) low rate peak clipping process is saved iff adopting one-level 3, signal has PAR_avg0.01%=7.9 at CCDF, the multistage peak cutting device of visible employing (EVM is 4.3%), the PAR of signal can more than enough reduction 0.8dBc.Therefore, adopt multistage peak clipping, and self-adaptative adjustment peakvalue's checking window length, thus make the more than enough peak power eliminating 1dBc nearly of peak value energy, there is larger improvement to DPD effect like this.Illustrate two-stage peak clipping CCDF below to scheme and temporal amplitude comparison diagram.As shown in Figure 7 A, be the schematic diagram of CCDF before and after first order peak clipping.As shown in Figure 7 B, be the schematic diagram of temporal amplitude before and after first order peak clipping.As seen in figure 7 c, be the schematic diagram of CCDF before and after the peak clipping of the second level.As illustrated in fig. 7d, be the schematic diagram of temporal amplitude before and after the peak clipping of the second level.
In sum, Multirate crest-cut ratio first-rate peak clipping effect is adopted to have a clear superiority in, also more effective the practicality of algorithm.Low speed peak clipping eliminates large peak signal, and the small leak signal carried in high speed peak cutting device subsequently, then can adopt less hardware resource.Such as, LTE signal peak clipping under 122.88MHZ of 60MHx adopts 3 grades of 8 hardware peak eliminator, has a large amount of peak regeneration when signal is under 245.76MHz by the time.If the peak clipping under 122.88MHZ of LTE signal adopts 1 grade of 8 hardware peak eliminator, adopt 1 grade of 8 hardware peak eliminator just more than enough peak value eliminating 1dBc of energy at 245.76 times.And two kinds of peak cutting devices are substantially the same on hardware resource.
In the embodiment of the present invention, after multicarrier superposition, before digital pre-distortion process, digital despicking process is divided into multistep treatment, and minimal level is carried out according to being inserted as one-level in 2 times, and score interpolation also can be considered.Such digital despicking process can be divided into low rate peak clipping, medium-rate peak clipping and two-forty peak clipping process.Further, the peak clipping operational processes of every one-level is identical, and difference is that processing speed is different, the difference of despiking coefficient, the frequency spectrum of despiking coefficient and the service signal frequency spectrum coupling of input.Further, despiking coefficient adopts the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse, and increase band stray frequently, alleviate the noise in frequency band, be equivalent to alleviate the deterioration of EVM in frequency band, EVM can improve about 1%.
In the embodiment of the present invention, along with the continuous lifting of signal rate, the numerical value exceeding the sampled point of thresholding in a peak value is increasing, so the length of peakvalue's checking window also will along with variation, for first order peakvalue's checking window length W1, second level peakvalue's checking window length W2, third level peakvalue's checking window length W3, then in the embodiment of the present invention, need to ensure W3>W2>W1.This is because: along with the lifting of speed, the quantity of the sampled point that peak value comprises increases, and therefore, detection window is long also wants self-adaptative adjustment.
In sum, compared with prior art, in the embodiment of the present invention, adopt Multirate peak clipping mode to be eliminated by signal peak, the signal peak recurrence after can avoiding interpolation, peak clipping effect is better, and the hardware resource of peak clipping process can be saved, improve the performance of peak clipping process, and the problems such as after can solving multicarrier superposition, peak value lifting is comparatively large, peak regeneration, signal quality deteriorates.Further, aforesaid way eliminates large peak signal by low speed peak clipping, and the small leak signal carried over is subsequently by high speed peak clipping.Aforesaid way can self-adaptative adjustment peakvalue's checking window length, has larger improvement like this to DPD effect.Further, when resource is saved, adopt Multirate peak cutting device resource to save most, performance is best, and when can eliminate 5dBc, EVM still can control within 4.5%.In addition, the despiking coefficient of every one-level peak cutting device inserts sharp-pointed pulse between the space of the frequency band of multicarrier, alleviates the deterioration of inband signal quality, can improve signal quality to a certain extent.
Embodiment two
Based on the inventive concept same with said method, additionally provide a kind of Multirate peak cutting device in the embodiment of the present invention, as shown in Figure 8, described Multirate peak cutting device comprises:
First processing module 11, for after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition;
Second processing module 12, for after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
Also comprise: the 3rd processing module 13, preset the second speed peak clipping thresholding for utilizing in described second processing module and preset after the second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before digital pre-distortion DPD process is carried out to signal, utilize to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and third level digital despicking is carried out to DPD signal before treatment.
Described default first despiking coefficient, described default second despiking coefficient, described the 3rd despiking coefficient of presetting are specially: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.The first peak clipping speed of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peak clipping speed that the signal after to interpolation carries out second level digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed of DPD signal before treatment being carried out to third level digital despicking.
In the embodiment of the present invention, the first peak value detection window length of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peakvalue's checking window length that the signal after to interpolation carries out second level digital despicking; The second peakvalue's checking window length of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peakvalue's checking window length of DPD signal before treatment being carried out to third level digital despicking.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can be separated deployment.Above-mentioned module can merge into a module, also can split into multiple submodule further.
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 required 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.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform 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 carry out being 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 being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. a Multirate despicking method, is characterized in that, said method comprising the steps of:
Multirate peak cutting device, after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition;
Described Multirate peak cutting device, after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
2. the method for claim 1, is characterized in that, described method comprises further:
Described Multirate peak cutting device is preset the second speed peak clipping thresholding in utilization and is preset after the second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before carrying out digital pre-distortion DPD process to signal, described Multirate peak cutting device utilizes to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and carries out third level digital despicking to DPD signal before treatment.
3. method as claimed in claim 2, it is characterized in that, described default first despiking coefficient that described Multirate peak cutting device uses, described default second despiking coefficient, described the 3rd despiking coefficient of presetting are specially: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.
4. method as claimed in claim 2, is characterized in that, the first peak clipping speed of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peak clipping speed that the signal after to interpolation carries out second level digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed of DPD signal before treatment being carried out to third level digital despicking.
5. method as claimed in claim 2, is characterized in that, the signal after multicarrier superposition is carried out to the first peak value detection window of first order digital despicking is long to be less than the signal after to interpolation to carry out the second peakvalue's checking window of second level digital despicking long; Signal after interpolation is carried out to the second peakvalue's checking window of second level digital despicking is long is less than that to carry out the 3rd peakvalue's checking window of third level digital despicking to DPD signal before treatment long.
6. a Multirate peak cutting device, is characterized in that, described Multirate peak cutting device comprises:
First processing module, for after multicarrier superposition, utilizes to preset first rate peak clipping thresholding and preset the first despiking coefficient and carries out first order digital despicking to the signal after multicarrier superposition;
Second processing module, for after Interpolation of signals, utilizes to preset the second speed peak clipping thresholding and preset the second despiking coefficient and carries out second level digital despicking to the signal after interpolation.
7. Multirate peak cutting device as claimed in claim 6, is characterized in that, also comprise:
3rd processing module, preset the second speed peak clipping thresholding for utilizing in described second processing module and preset after the second despiking coefficient carries out second level digital despicking to the signal after interpolation, and before digital pre-distortion DPD process is carried out to signal, utilize to preset third speed peak clipping thresholding and preset the 3rd despiking coefficient and third level digital despicking is carried out to DPD signal before treatment.
8. Multirate peak cutting device as claimed in claim 7, it is characterized in that, described default first despiking coefficient, described default second despiking coefficient, described the 3rd despiking coefficient of presetting are specially: adopt the frequency band space between different carrier to insert sharp-pointed frequency-domain impulse.
9. Multirate peak cutting device as claimed in claim 7, is characterized in that, the first peak clipping speed of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peak clipping speed that the signal after to interpolation carries out second level digital despicking; The second peak clipping speed of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peak clipping speed of DPD signal before treatment being carried out to third level digital despicking.
10. Multirate peak cutting device as claimed in claim 7, it is characterized in that, the first peak value detection window length of the signal after multicarrier superposition being carried out to first order digital despicking is less than the second peakvalue's checking window length that the signal after to interpolation carries out second level digital despicking; The second peakvalue's checking window length of the signal after interpolation being carried out to second level digital despicking is less than the 3rd peakvalue's checking window length of DPD signal before treatment being carried out to third level digital despicking.
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