CN103188199A - Broadband peak clipping method and broadband peak clipping device based on fractional delay CPG (Certified Program Generator) - Google Patents
Broadband peak clipping method and broadband peak clipping device based on fractional delay CPG (Certified Program Generator) Download PDFInfo
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Abstract
The invention discloses a broadband peak clipping method and a broadband peak clipping device based on a fractional delay CPG (Certified Program Generator). The broadband peak clipping method comprises the following steps of: carrying out polar coordinate transformation after carrying out N-times pre-interpolation on an input signal with a low sampling rate, so that the polar coordinate is converted into amplitude information and phase information of a polar coordinate area, wherein N is a positive integer; carrying out N-times extraction on the searched peak value information after carrying out peak searching and calculating on the amplitude information; triggering CPG filter pulse output of CPG_LUTN in sequence by utilizing the extracted peak information, wherein the extracted frictional phase information is used for controlling a CPG sequence corresponding to the frictional phase by selectively controlling the CPG_LUTN output; carrying out phase extraction on the phase information, and carrying out rectangular coordinate conversion on the extracted phase and the peak information to acquire peak clipping offset pulse. The broadband peak clipping device comprises a N-times pre-difference filter module, a polar coordinate conversion module, a peak value searching calculating module, a peak information extracting module, a peak scheduling module, a phase extracting module and a rectangular coordinate conversion module.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of broadband despicking method and device based on mark time-delay CPG (the peak clipping cancellation pulses is extracted and calculated Cancel Pulse Generator).
Background technology
Development along with mobile communication technology and industry, the direction transition gradually that the mobile communication base station sender merges from one-segment single system product to the multiband multi-modulation scheme, the useful signal occupied bandwidth reaches more than the 100MHz, the processing clock speed that the original despicking method of industry needs is original more than several times, and the disposal ability of present hardware and chip has been brought very big challenge.
Existing mobile communications system all adopts the higher QPSK of the availability of frequency spectrum (Quadrature Phase Shift Keying, the quarternary phase-shift keying (QPSK) signal) with QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) etc. modulation system is modulated phase place and the amplitude of carrier wave, the instantaneous power of output signal has bigger fluctuation, generation has big PAPR (Peak to Average Power Ratio, the ratio of peak power and average power abbreviates peak-to-average force ratio as) non-permanent envelope modulated signal.In addition, every antenna on the transceiver of the commercial base station of 3G product all carries a plurality of carrier waves, multi-carrier signal carries out linear superposition at digital intermediate frequency and merges, so also can occur because the phenomenon of the stronger signal peak-to-average ratio that the peak-to-peak stack produces at the antenna transmitting terminal.Peak power is too big, is easy to make power amplifier to be operated in the inelastic region, thereby produces stronger ACLR (Adjacent Channel Leakage power Ratio, side channel leakage power ratio), and then reduces systematic function.For reducing nonlinear distortion, the instantaneous power that transmits must be less than the 1dB compression point, and this falls very lowly with regard to the average power that requires signal, causes the efficient of power amplifier to reduce, and the coverage of having dwindled the base station.And high PAPR can cause the dynamic range of D/A (digital-to-analogue conversion) transducer to diminish, if use high-resolution D/A converter, cost will improve greatly, if use the lower D/A converter of resolution, quantizing noise can strengthen.
The purpose of peak clipping is to reduce the peak-to-average force ratio of signal, by certain technology bigger peak value in the non-permanent envelope modulated signal is pruned, and improves the efficient of power amplifier and does not influence the power amplifier linearization index.In case reduced signal peak-to-average ratio, just can improve the output average power of power amplifier, efficient has also just improved.During less than peak-to-average force ratio reduction amount, can allow power amplifier be operated in linear zone in power raising amount, then the linear index ACLR of power amplifier is also just better.
Existing peak clipping algorithm substantially all adopts peak pulse moulding cancellation technology, that is: at first obtain closing the peak value of multi-carrier signal behind the ripple according to the peak clipping Threshold detection, the peak value that will be higher than the peak clipping thresholding deducts after the peak value threshold value to merge with respective phase information and reverts to the territory, right angle, IQ (In-phase Quadrature to the territory, right angle, inphase quadrature) pulse value carries out molding filtration and obtains the peak clipping cancellation pulses, offsets with the original signal after time-delay is alignd.The effect of molding filtration be spectrum limitations with the peak clipping cancellation pulses in the band of original signal in order to keep after the peak clipping signal ACLR preferably.
Figure 1 shows that the basic schematic diagram of peak clipping flow process, input IQ signal is divided into two-way, one tunnel waits of delaying time, and another road is used for asking for the peak clipping cancellation pulses, and the two paths of signals alignment is subtracted each other and can be obtained exporting the IQ signal after the peak clipping.
As can be seen, CPG is part most crucial in the peak clipping process.Figure 2 shows that at present the most frequently used peak clipping cancellation pulses produces flow chart.The IQ signal is amplitude and phase place through Coordinate Conversion, find peak information by the slope variation of judging adjacent four amplitude point, peak information and peak clipping thresholding are subtracted each other the amplitude information of the peak pulse that can obtain the needs counteracting and offset positional information accordingly.The amplitude of peak pulse is the wide range of diffusion at frequency domain, and the processing after this is exactly by a digital formed filter that exponent number is very high, and the peak pulse that needs are offset is limited in the signal band.Because data sampling speed height causes the exponent number of digital formed filter very high during peak clipping, therefore the pattern that the characteristic of utilizing peak value to be interrupted single appearance usually uses a plurality of CPG_LUT (Look-Up-Table, look-up table) parallel connection to search with multiply accumulating realizes that digital formed filter is to save resource.What store among the CPG_LUT is filter coefficient, trigger the pulse of CPU_LUT output filter coefficient successively according to peak, coefficient pulse and corresponding process are sentenced the accuser to the punishment facing the person he falsely accused peak amplitude IQ information that mark transforms to the territory, right angle and are multiplied each other and add up, and can obtain last peak clipping cancellation pulses like this.The effect of peak value scheduling is that peak value is carried out certain screening on the one hand, less peak value is generally directly removed to reduce amount of calculation, be the positional information that triggers CPG_LUT to be carried out some dispatch to prevent congested on the other hand, the CPG_LUT that is exporting the pulse of CPG filter can not be interrupted output again, otherwise the radio-frequency component that occurs appears not wishing in CPG filter pulse meeting.
As shown in Figure 3, calculate in the flow process that produces at the CPG filter coefficient, protype_ci (wherein, i=1,2 ..., n, n is positive integer) be the prototype filter coefficient that satisfies the spectral emission template of corresponding each carrier wave, the frequency exp (j*wi*n) of prototype filter and corresponding carrier wave and power factor P_ci multiply each other and add up and can obtain CPG filter complex coefficient.
For obtaining peak clipping performance preferably, data sampling speed was not less than 5 times of the shared bandwidth of useful signal when present algorithm required peak clipping.If be lower than this ratio, have bigger recovery according to PAPR after signal continues to upconvert to radiofrequency signal after the peak clipping of above-mentioned pulse cancellation algorithms, cause performance can not meet the demands substantially.
Along with the explosive growth of mobile subscriber to the data business demand, mobile communications network is more and more wideer to the requirement of bandwidth, mobile communication from 3G (3rd-generation, 3G (Third Generation) Moblie technology) to the more LTE in broadband (Long Term Evolution, Long Term Evolution) transition.In addition, the GSM of 2G (Global System of Mobile communication, global system for mobile communications) network also has a large number of users, in this case for reducing the mobile communication equipment hardware cost, need the base station product can support the mobile network of the different systems of a plurality of frequency ranges simultaneously, the bandwidth that causes the base station product needed to be supported is more and more wideer.
Therefore, broadband is the most significant trend of current mobile communications network, and under 100MHz bandwidth applications condition, data sampling speed will reach 500MHz during peak clipping, and this has proposed very big challenge to the work schedule of existing digital device and power consumption etc.In addition, data rate is more high during peak clipping, and the digital formed filter relative bandwidth that designs according to carrier bandwidths is more little, and this has brought very big challenge for the design of digital formed filter and exploitation, is difficult to guarantee the ACLR characteristic of signal after the peak clipping.
Summary of the invention
The invention discloses a kind of broadband despicking method and device based on mark time-delay CPG, to overcome existing despicking method defective too high to digital requirement on devices under the bandwidth applications condition.
For addressing the above problem, the invention provides a kind of broadband despicking method based on mark time-delay CPG, comprising:
After the signal of low sampling rate of input carried out the doubly pre-interpolation of N, carry out the polar coordinates conversion, convert amplitude information and the phase information in polar coordinates territory to; Wherein, N is positive integer;
Described amplitude information is carried out the peak information that searches being carried out N doubly extracting after peak value searching calculates; The peak information that utilization extracts triggers the CPG filter pulse output of CPG_LUTN successively, extracts fractional phase information and is used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase;
Described phase information is carried out the phase bit extraction, and the phase place after extracting and peak information are carried out the rectangular coordinate conversion, obtain the peak clipping cancellation pulses.
Further, described method also comprises:
After finishing the phase bit extraction, phase information is carried out the conversion of Fs/4 shift frequency; Wherein, Fs is the signals sampling frequency;
Before the output offset pulse, signal is carried out anti-Fs/4 shift frequency conversion.
Further,
The value of N is any one in 2,3 and 4.
Further,
Describedly carry out polar coordinates conversions and refer to adopt general rotation of coordinate numerical iteration algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.
Further,
Described amplitude information to output carries out peak value searching and calculates, and specifically comprises:
Range value is if be lower than the peak clipping thresholding and then get 0, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding;
In the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, in continuous 4 sampled point A, B, C, D, if B＞A and C＞=D, then get peak value of the bigger conduct of B and C intermediate value, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and the value of other sampled point in these 4 sampled points is set to 0.
Further,
If do not satisfy this condition of B＞A and C＞=D, then the value with these 4 sampled points all is set to 0.
Further,
The described peak information that carries out extracts, and specifically comprises:
The range value that compares two points of high velocity of the corresponding low rate point in peak value front and back gets the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.
Further,
Described phase information to output is carried out the phase bit extraction, specifically comprises:
Get the peak point after the corresponding phase value of peak value point corresponds to extraction.
Further,
The peak information that described utilization extracts triggers the CPG filter pulse output of CPG_LUTN successively, specifically comprises:
After the described frequency exp (j*wi*n) that utilizes prototype filter and corresponding carrier wave and power factor P_ci multiply each other and add up, utilize the Farrow filter that the CPG coefficient is carried out the mark time-delay, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N.
Correspondingly, the present invention also provides a kind of broadband peak cutting device based on mark time-delay CPG, comprising:
N is pre-difference filtration module doubly, is used for the signal of the low sampling rate of input is carried out the doubly pre-interpolation of N; Wherein, N is positive integer;
The polar coordinates modular converter is used for the signal of the doubly pre-difference filtration module output of N is carried out the polar coordinates conversion, converts amplitude information and the phase information in polar coordinates territory to;
The peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating;
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts;
The peak value scheduler module, trigger the CPG filter pulse of CPG_LUTN for the peak information that utilizes described peak information abstraction module to extract successively and export, extract fractional phase information and be used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase;
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction;
The rectangular coordinate modular converter is used for the phase place after extracting and peak information are carried out the rectangular coordinate conversion, obtains the peak clipping cancellation pulses.
Further,
Described phase place abstraction module also is used for after finishing the phase bit extraction phase information being carried out the conversion of Fs/4 shift frequency; Wherein, Fs is the signals sampling frequency;
Also comprise in the described device:
Anti-Fs/4 shift frequency module was used for before the output offset pulse, and signal is carried out anti-Fs/4 shift frequency conversion.
Further,
The value of N is any one in 2,3 and 4.
Further,
Described polar coordinates modular converter is used for adopting general rotation of coordinate numerical iteration algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.
Further,
Described peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating, specifically comprises:
Described peak value searching computing module is used for if judging range value is lower than the peak clipping thresholding and then gets 0, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding;
Also be used for for the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, in continuous 4 sampled point A, B, C, D, if B＞A and C＞=D, then get peak value of the bigger conduct of B and C intermediate value, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and the value of other sampled point in these 4 sampled points is set to 0.
Further,
Described peak value searching computing module also is used for judging when not satisfying B＞A and this condition of C＞=D, and the value of these 4 sampled points all is set to 0.
Further,
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts, and specifically comprises:
Described peak information abstraction module, be used for the relatively range value of two points of high velocity of the corresponding low rate point in peak value front and back, get the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.
Further,
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction, specifically comprises:
Described phase place abstraction module is used for getting the peak point after the corresponding phase value of peak value point corresponds to extraction.
Further,
The CPG filter pulse that described peak value scheduler module is used for utilizing the peak information that extracts to trigger CPG_LUTN is successively exported, and specifically comprises:
After described peak value scheduler module is used for utilizing the frequency exp (j*wi*n) of prototype filter and corresponding carrier wave and power factor P_ci to multiply each other and adds up, utilize the Farrow filter that the CPG coefficient is carried out mark time-delay, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N.
The present invention greatly reduces the peak clipping processing to the requirement of digital hardware and chip processing speed.
Description of drawings
Fig. 1 is peak clipping technology entire block diagram in the prior art;
Fig. 2 is that at present general peak clipping cancellation pulses is extracted block diagram;
Fig. 3 is that at present general CPG filter coefficient calculates schematic diagram;
Fig. 4 is that the peak clipping cancellation pulses that adds in the embodiment of the invention after mark delay process and Fs/4 shift frequency are handled is extracted FB(flow block);
Fig. 5 is that embodiment of the invention high speed rate peak value extracts and the fractional phase delayed data produces schematic diagram;
Fig. 6 is the CPG filter coefficient calculation process schematic diagram that adds in the embodiment of the invention after mark filtering wave by prolonging time and Fs/4 shift frequency are handled;
Fig. 7 is the amplitude of CPG coefficient and reciprocal fraction delayed data schematic diagram under the N=4 situation in the embodiment of the invention;
Fig. 8 is based on the broadband peak cutting device structure chart of mark time-delay CPG in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention by reference to the accompanying drawings.Need to prove that under the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
Peak clipping cancellation pulses of the present invention is extracted and is produced flow process as shown in Figure 4.Here importing IQ signal sampling speed only gets final product for about 2.5 times of the signal occupied bandwidth.Compare with prior art shown in Figure 2, mainly contain these points and improve with different:
1) in order to find accurate amplitude cancellation information, need carry out the doubly pre-interpolation of N to the signal of the low sampling rate of input, need to have interpolation filter to suppress image signal after the interpolation;
2) increase phase bit extraction and Fs/4 shift frequency modular converter, need with interpolation n doubly the phase place of back signal be drawn on the speed before the interpolation, the conversion of Fs/4 shift frequency is for the peak pulse signal is moved on the Fs/4 from zero-frequency;
3) increase peak information and extract processing module, the sampling rate of the peak value high sampling rate after by pre-interpolation is reduced on the low sampling rate of input, and extract fractional phase information when extracting;
4) the Fs/4 frequency need be moved by zero-frequency in the passband center of CPG filter, its coefficient no longer is plural number but real number, correspondingly the back takes advantage of to add and is calculated as that real multiply adds rather than CM adds, the different CPG coefficient of the corresponding use of different extraction fractional phase, so CPG_LUTN is two-dimentional real number look-up table, comprise the corresponding different CPG real number coefficients that extract fractional phase of N group;
5) centre frequency through cancellation pulses after the processing of front is Fs/4, handles so in the end need to increase the anti-Fs/4 shift frequency of one-level, and uses half-band filter filtering image signal.
In the present embodiment, input IQ signals sampling speed is lower, but in order to guarantee peak clipping performance preferably, peak value searching calculates and still need carry out in higher sampling rate, generally need carry out in the sampling rate of at least 5 times of signal occupied bandwidths, so before peak value searching, need input IQ signal is carried out the doubly pre-interpolation of N.N get 2,3 or 4 all can, generally need not exceed 4.Because interpolation is in order to extract the peak clipping offseting signal, so image-reject filter need not suppress according to the mirror image of transmitting chain Digital Up Convert to require to design, mirror image suppresses requirement can require to reduce 10dB to 20dB than the spectrum template of standard protocol specifies, so the hardware costs of this method interpolation is less relatively.
Signal after the interpolation adopts existing C ORDIC (COordinate Rotation DIgital Computer, rotation of coordinate numerical calculation method) iterative algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.Emulation and test show that the computational accuracy of 8 CORDIC iteration is just enough.
After converting the IQ signal to polar coordinates, amplitude and phase information are divided into two-way and handle respectively.Then to get range value be 0 to range value if be lower than the peak clipping thresholding, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding; Wherein, the value of peak value detection threshold is more than or equal to the value of peak clipping thresholding.Then in the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, namely from per 4 continuous sampling point A, B, C, D, judge the position that peak value may occur, if when satisfying B＞A and C＞=D, get that higher value is a peak value among B, the C, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and other point in these 4 points all is set to zero; If do not satisfy this condition of B＞A and C＞=D, then these 4 sampled points all are set to 0.Peak information is to be zero real time data stream greater than all the other points the peak point of peak clipping thresholding except signal envelope.
Peak information need carry out N and doubly be drawn into low sampling rate so that subsequent treatment, as shown in Figure 5, when supposing N=4, the peak information point of 1 corresponding 4 two-forty of low rate point, peak information extracts post-sampling speed and reduces by 4 times, peak value abstraction module output increase extract before the fractional phase information of high-speed data, fractional phase information correspondence-3 is to 3, namely-N+1 is to N-1.The range value that compares two high sampling rates of the corresponding low rate point in peak value front and back gets the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.As peak value P1 point among Fig. 5, in the two-forty range value, observe relatively about it two low rate sampled value A00 and A10, because A00 〉=A10 places the A00 position so extract the back peak point, be zero point with the A00 position, to obtain extracting the mark delayed data be 2 to peak before and after relatively extracting.All the other several example points and the like.As can be seen from Figure 5, if peak intervals is less than 2*N under the preceding high sampling rate of extraction, extraction operation can't continue or can produce two peak points that occur continuously so, this situation need be avoided occurring, so before peak value extracts, need that the high sampling rate peak value is had certain processing, remove less relatively peak value and make sampling interval between two peak values greater than 2*N.
Phase information also needs to extract processing.Similar with the peak value extraction process, get the peak point that the corresponding phase value of peak value point corresponds to after the extraction and get final product, need not duplicate record extraction fractional phase information.The purpose of Fs/4 shift frequency is that peak information is moved on to Fs/4 from zero-frequency, be equivalent to original signal in the rectangular coordinate territory and multiply by exp (j*Fs/4*2* π * n/Fs), be exp (j* π * n/2), in the polar coordinates territory, be equivalent on phase information according to 4 for circulation adds 0 successively, pi/2, π and π * 3/2, can surpass 2* π through some phase value after the additional calculation, so need carry out the complementation of 2* π is handled with the scope of normalizing to 0 to 2* π to the phase information that circled addition calculates.
Peak amplitude information after the extraction and phase information process CORDIC iteration are transformed into the IQ pulse in territory, right angle, and the IQ pulse namely obtains the peak clipping cancellation pulses through the CPG filter process.Among Fig. 4 in the frame of broken lines CPG handle and be equivalent to a digital FIR filter, all to be operated in complex field different with multiplication among Fig. 2 and addition, the multiplication here and additional calculation are all in real number field, amount of calculation reduces half.
The positional information that extracts the back amplitude is used for triggering successively the CPG filter pulse output of CPG_LUTN, extracts fractional phase information and is used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase.
CPG_LUTN is a two-dimensional look-up table, storage be N group CPG filter coefficient.The fractional phase value from-(N-1) to N-1 2*N-1 group altogether, wherein each other opposite number as-1 and the CPG coefficient of+1 correspondence only differ from 1 time in sampling interval in the integer time-delay, the sequence of values value is identical, has only the N group so corresponding CPG coefficient is actual.The negative value fractional phase is put forward previous sampled point triggering for generating on the occasion of the CPG of fractional phase correspondence coefficient and is got final product than corresponding.
The calculating of CPG coefficient as shown in Figure 6, different with Fig. 3 is adds one-level Farrow filter the CPG coefficient is carried out the mark time-delay after read group total, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N, the reciprocal fraction phase place is 0～N-1.The mark time-delay is calculated and is generally all used general Farrow wave filter technology to realize.Handle and get real part and center frequency point is positioned at frequency is the real number of Fs/4 centered by the plural system number conversion of zero-frequency through carrying out the Fs/4 shift frequency after the mark time-delay again.Ditto described, exp (j* π * n/2) is (1, j,-1,-j) the loop cycle of these 4 values is got Fs/4 to a plural number and is handled and namely be converted into 4 to be real imaginary part exchange and the negate processing in cycle, need guarantee during processing that filter middle coefficient and exp (j* π * 0/2) calculate.Plural number behind the Fs/4 shift frequency is got real part and is namely obtained last CPG filter real number coefficient.The CPG coefficient amplitude figure that certain application scenarios calculates under the N=4 situation as shown in Figure 7 and data peaks part enlarged drawing ,-3 and 3 ,-2 and 2 ,-1 with 1 respectively corresponding CPG coefficient numerical value be the same, just sampling instant has shifted to an earlier date a sampled point.The CPG coefficient can use software program to calculate at general processor and finish, and also can use the digital hardware circuit to calculate in real time and finish, and the latter often is applied to the application scenario of carrier signal frequency and power generation real-time change.After finishing, the CPG coefficient calculations deposits in the CPG_LUTN storage form.CPG_LUTN storage form number has certain variation with the difference of application scenarios, generally gets 6 to 10, and the CPG_LUTN that needs under the more high situation of input signal peak-to-average force ratio is more many.
Peak I Q pulse is centered close to the cancellation pulses that the CPG real filter of Fs/4 handle to generate through passband and is positioned at the Fs/4 position, can have mirror image in-Fs/4 position in addition, needs to suppress through anti-Fs/4 shift frequency and half-band filter the processing of mirror image.Anti-Fs/4 handles namely to be needed to exp on the signal times (j*Fs/4*2* π * n/Fs), this be with (1 ,-j ,-1, for 4 constants of circulation, be that the cycle is carried out real imaginary part exchange to complex data and the negate processing gets final product with 4 namely j).Handle the back mirror position through anti-Fs/4 and be positioned at the Fs/2 place, use comparatively simple general half-band filter to carry out mirror image and suppress to get final product.Pass through this last anti-Fs/4 shift frequency and partly be with mirror image to suppress, namely obtained the peak clipping cancellation pulses of last needs.
Said method makes counteracting moulding pulse align with original signal in amplitude and time two dimensions, the ratio of topmost processing section signal sampling speed and occupied bandwidth only gets final product about 2.5 times in this peak cutting device and the method, namely reduces by one times than present disclosed method.In addition, be further to reduce peak cutting device to the requirement of hardware resource, signal is done Fs/4 shift frequency and Fs/4 backward shift frequently, thereby change complex signal the technology of real number signal into, greatly reduce peak cutting device to the requirement of hardware circuit resource.Here Fs is the signals sampling frequency, sample frequency be Fs complex digital signal the frequency domain scope for-Fs/2 is to Fs/2, Fs/4 is the center of corresponding positive frequency.
Disclosed by the invention mainly is a kind of digital hardware circuit arrangement that is applied to sender, can directly apply among the design of intermediate frequency ASIC or FPGA.
Suppose that the input signal occupied bandwidth is 60MHz, so baseband signal is closed the sampling rate that the road upconverts to 2.5 times of occupied bandwidths and be input to this peak cutting device.
Further the IQ sampling rate of this device of hypothesis input is such as be 153.6MHz, and the interpolation multiple is 4 in advance.
The pre-interpolation of IQ signal is utilized the CORDIC iterative algorithm to carry out polar coordinates to 614.4MHz for 4 times and is changed and peak value searching.Here pre-interpolation filter is rented and is with mirror image inhibition 60dBc to get final product, and the 614.4MHz sampling rate is higher, can adopt the parallel computation of heterogeneous method reduction of speed.
Method according to Fig. 5 extracts amplitude and phase place, and extracts the mark delayed data, and phase place is carried out the Fs/4 shift frequency handle.
According to practical application scene prototype filter coefficient and Farrow filter coefficient, utilize flow chart shown in Figure 6 to calculate the CPG filter coefficient, coefficient is configured to CPG_LUTN shown in Figure 4.CPG_LUTN form number is got 8 just passable under the general applicable cases.
Peak amplitude after the extraction and phase place are utilized cordic algorithm to carry out rectangular coordinate and are converted to the IQ peak pulse.
Peak and fractional phase delayed data trigger the pulse of corresponding CPG filter and IQ peak pulse successively and multiply each other and add up and obtain cancellation pulses.This cancellation pulses namely obtains last peak clipping cancellation pulses through anti-Fs/4 shift frequency and half-band filter inhibition mirror image.
Input IQ signal after the time-delay alignment deducts the peak value offset pulse and namely obtains the peak clipping output signal.
As shown in Figure 8, a kind of broadband peak cutting device based on mark time-delay CPG comprises:
N is pre-difference filtration module doubly, is used for the signal of the low sampling rate of input is carried out the doubly pre-interpolation of N; Wherein, N is positive integer;
The polar coordinates modular converter is used for the signal of the doubly pre-difference filtration module output of N is carried out the polar coordinates conversion, converts amplitude information and the phase information in polar coordinates territory to;
The peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating;
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts;
The peak value scheduler module, trigger the CPG filter pulse of CPG_LUTN for the peak information that utilizes described peak information abstraction module to extract successively and export, extract fractional phase information and be used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase;
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction;
The rectangular coordinate modular converter is used for the phase place after extracting and peak information are carried out the rectangular coordinate conversion, obtains the peak clipping cancellation pulses.
Preferably,
Described phase place abstraction module also is used for after finishing the phase bit extraction phase information being carried out the conversion of Fs/4 shift frequency; Wherein, Fs is the signals sampling frequency;
Also comprise in the described device:
Anti-Fs/4 shift frequency module was used for before the output offset pulse, and signal is carried out anti-Fs/4 shift frequency conversion.
Preferably,
The value of N is any one in 2,3 and 4.
Preferably,
Described polar coordinates modular converter is used for adopting general rotation of coordinate numerical iteration algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.
Preferably,
Described peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating, specifically comprises:
Described peak value searching computing module is used for if judging range value is lower than the peak clipping thresholding and then gets 0, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding;
Also be used for for the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, in continuous 4 sampled point A, B, C, D, if B＞A and C＞=D, then get peak value of the bigger conduct of B and C intermediate value, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and the value of other sampled point in these 4 sampled points is set to 0.
Preferably,
Described peak value searching computing module also is used for judging when not satisfying B＞A and this condition of C＞=D, and the value of these 4 sampled points all is set to 0.
Preferably,
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts, and specifically comprises:
Described peak information abstraction module, be used for the relatively range value of two points of high velocity of the corresponding low rate point in peak value front and back, get the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.
Preferably,
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction, specifically comprises:
Described phase place abstraction module is used for getting the peak point after the corresponding phase value of peak value point corresponds to extraction.
Preferably,
The CPG filter pulse that described peak value scheduler module is used for utilizing the peak information that extracts to trigger CPG_LUTN is successively exported, and specifically comprises:
After described peak value scheduler module is used for utilizing the frequency exp (j*wi*n) of prototype filter and corresponding carrier wave and power factor P_ci to multiply each other and adds up, utilize the Farrow filter that the CPG coefficient is carried out mark time-delay, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is the preferred embodiments of the present invention only, is not for limiting protection scope of the present invention.According to summary of the invention of the present invention; also other various embodiments can be arranged; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. broadband despicking method based on mark time-delay CPG comprises:
After the signal of low sampling rate of input carried out the doubly pre-interpolation of N, carry out the polar coordinates conversion, convert amplitude information and the phase information in polar coordinates territory to; Wherein, N is positive integer;
Described amplitude information is carried out the peak information that searches being carried out N doubly extracting after peak value searching calculates; The peak information that utilization extracts triggers the CPG filter pulse output of CPG_LUTN successively, extracts fractional phase information and is used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase;
Described phase information is carried out the phase bit extraction, and the phase place after extracting and peak information are carried out the rectangular coordinate conversion, obtain the peak clipping cancellation pulses.
2. the method for claim 1 is characterized in that, also comprises:
After finishing the phase bit extraction, phase information is carried out the conversion of Fs/4 shift frequency; Wherein, Fs is the signals sampling frequency;
Before the output offset pulse, signal is carried out anti-Fs/4 shift frequency conversion.
3. the method for claim 1 is characterized in that:
The value of N is any one in 2,3 and 4.
4. the method for claim 1 is characterized in that:
Describedly carry out polar coordinates conversions and refer to adopt general rotation of coordinate numerical iteration algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.
5. the method for claim 1 is characterized in that:
Described amplitude information to output carries out peak value searching and calculates, and specifically comprises:
Range value is if be lower than the peak clipping thresholding and then get 0, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding;
In the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, in continuous 4 sampled point A, B, C, D, if B＞A and C＞=D, then get peak value of the bigger conduct of B and C intermediate value, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and the value of other sampled point in these 4 sampled points is set to 0.
6. method as claimed in claim 5 is characterized in that:
If do not satisfy this condition of B＞A and C＞=D, then the value with these 4 sampled points all is set to 0.
7. the method for claim 1 is characterized in that:
The described peak information that carries out extracts, and specifically comprises:
The range value that compares two points of high velocity of the corresponding low rate point in peak value front and back gets the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.
8. as claim 1 or 7 described methods, it is characterized in that:
Described phase information to output is carried out the phase bit extraction, specifically comprises:
Get the peak point after the corresponding phase value of peak value point corresponds to extraction.
9. the method for claim 1 is characterized in that:
The peak information that described utilization extracts triggers the CPG filter pulse output of CPG_LUTN successively, specifically comprises:
After the described frequency exp (j*wi*n) that utilizes prototype filter and corresponding carrier wave and power factor P_ci multiply each other and add up, utilize the Farrow filter that the CPG coefficient is carried out the mark time-delay, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N.
10. broadband peak cutting device based on mark time-delay CPG comprises:
N is pre-difference filtration module doubly, is used for the signal of the low sampling rate of input is carried out the doubly pre-interpolation of N; Wherein, N is positive integer;
The polar coordinates modular converter is used for the signal of the doubly pre-difference filtration module output of N is carried out the polar coordinates conversion, converts amplitude information and the phase information in polar coordinates territory to;
The peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating;
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts;
The peak value scheduler module, trigger the CPG filter pulse of CPG_LUTN for the peak information that utilizes described peak information abstraction module to extract successively and export, extract fractional phase information and be used for selecting to control CPG_LUTN output corresponding to the CPG sequence of this fractional phase;
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction;
The rectangular coordinate modular converter is used for the phase place after extracting and peak information are carried out the rectangular coordinate conversion, obtains the peak clipping cancellation pulses.
11. device as claimed in claim 10 is characterized in that:
Described phase place abstraction module also is used for after finishing the phase bit extraction phase information being carried out the conversion of Fs/4 shift frequency; Wherein, Fs is the signals sampling frequency;
Also comprise in the described device:
Anti-Fs/4 shift frequency module was used for before the output offset pulse, and signal is carried out anti-Fs/4 shift frequency conversion.
12. device as claimed in claim 10 is characterized in that:
The value of N is any one in 2,3 and 4.
13. device as claimed in claim 10 is characterized in that:
Described polar coordinates modular converter is used for adopting general rotation of coordinate numerical iteration algorithm the IQ signal in territory, right angle to be transformed into amplitude and the phase place in polar coordinates territory.
14. device as claimed in claim 10 is characterized in that:
Described peak value searching computing module is used for the described amplitude information of described polar coordinates modular converter output is carried out peak value searching calculating, specifically comprises:
Described peak value searching computing module is used for if judging range value is lower than the peak clipping thresholding and then gets 0, and then to get range value be the difference that current range value deducts the peak value detection threshold if be higher than the peak clipping thresholding;
Also be used for for the range value that obtains after treatment, in every continuous 4 sampled points, carry out the search of a minor peaks, in continuous 4 sampled point A, B, C, D, if B＞A and C＞=D, then get peak value of the bigger conduct of B and C intermediate value, the value of determining this sampled point deducts the peak value of difference for needing to handle behind the peak clipping thresholding, and the value of other sampled point in these 4 sampled points is set to 0.
15. device as claimed in claim 14 is characterized in that:
Described peak value searching computing module also is used for judging when not satisfying B＞A and this condition of C＞=D, and the value of these 4 sampled points all is set to 0.
16. device as claimed in claim 10 is characterized in that:
The peak information abstraction module is used for that the peak information that described peak value searching computing module searches is carried out N and doubly extracts, and specifically comprises:
Described peak information abstraction module, be used for the relatively range value of two points of high velocity of the corresponding low rate point in peak value front and back, get the big position of range value and be the peak after extracting, and relatively the sampling interval of extraction front and back peak value sampling point obtains extracting fractional phase information.
17. as claim 10 or 16 described devices, it is characterized in that:
The phase place abstraction module is used for the described phase information of described polar coordinates modular converter output is carried out the phase bit extraction, specifically comprises:
Described phase place abstraction module is used for getting the peak point after the corresponding phase value of peak value point corresponds to extraction.
18. device as claimed in claim 10 is characterized in that:
The CPG filter pulse that described peak value scheduler module is used for utilizing the peak information that extracts to trigger CPG_LUTN is successively exported, and specifically comprises:
After described peak value scheduler module is used for utilizing the frequency exp (j*wi*n) of prototype filter and corresponding carrier wave and power factor P_ci to multiply each other and adds up, utilize the Farrow filter that the CPG coefficient is carried out mark time-delay, the mark delay value is followed successively by 0,1/N, 2/N ..., N-1/N.
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