CN103036840A - Communication method and communication system both based on efficient crest factor reduction (CFR) processing - Google Patents
Communication method and communication system both based on efficient crest factor reduction (CFR) processing Download PDFInfo
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Abstract
The invention discloses a communication method and a communication system both based on efficient crest factor reduction (CFR) processing. The communication system comprises a signal input unit, a signal output unit and at least one CFR processing module which is used for subtracting of forming filter coefficients and corresponding signal peak values so as to achieve reducing of peak-to-average ratio. The communication method includes a first step of processing signals received by a receiving antenna, and outputting digital signals of a path I and digital signals of a path Q, a second step of carrying out subtracting of the forming filter coefficients and the corresponding signal peak values so as to carry out peak-to-average ratio processing to the digital signals of the path I and the digital signals of the path Q, and a third step of processing the digital signals of the path I and the digital signals of the path Q after the peak-to-average ratio processing and then emitting the digital signals of the path I and the digital signals of the path Q. The communication method and the communication system both based on the CFR processing can be flexibly applied to multi-carrier systems with different models, can greatly reduce degree of distortion of the signals, can improve a function of digital predistortion, and enables the utilization rate to be greatly improved. Therefore, the communication method and the communication system both based on the CFR processing can be widely used in the field of communication.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of communication means and system that can be applicable to flexibly multicarrier and different system and process based on efficient CFR.
Background technology
Terminological interpretation:
CFR (Crest Factor Reduction): crest factor reduces
CCDF(Complementary Cumulative Distribution Function): complementary cumulative distribution function
The existing scheme that crest factor is reduced mainly comprises I ﹠amp; Q or base band polarity amplitude limit, peak window CFR(PW-CFR), noise shaped CFR(NS-CFR) and pulse inject CFR(PI-CFR).Yet the shortcoming of these existing schemes is: reduce the signal that obtains after the processing through crest factor, and the large and error vector magnitude deterioration of its distortion, and also it can't be applied in a flexible way in different communication systems and multi-carrier signal.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of this invention is to provide a kind of can flexible Application in multicarrier and different system, and the communication means of processing based on efficient CFR that is easy to realize.
Another object of the present invention provide a kind of can flexible Application in multicarrier and different system, and the communication system of processing based on efficient CFR simple in structure and that be easy to realize.
The technical solution adopted in the present invention is: a kind of communication means of processing based on efficient CFR, and the method comprises:
S1, the signal that receives antenna reception is processed, and then output I, Q two ways of digital signals;
Thereby S2, subtract each other by forming filter coefficient and corresponding signal peak and I, Q two ways of digital signals to be reduced peak-to-average force ratio process;
S3, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are launched after processing.
Further, described step S2 comprises:
The first time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
The second time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
Ask absolute value block that I, Q two ways of digital signals are carried out absolute value and calculate, and then obtain the absolute value signal of I, Q two ways of digital signals;
Peak detection block is according to default threshold value and the absolute value signal that calculates, thereby detect the peak value above predetermined threshold value, thereby detect the peak point corresponding with this peak value, and obtain the I corresponding with detected peak point, Q actual signal data according to detected peak point and then from the second time-delay alignment modules, and I, Q actual signal data and the absolute value corresponding with peak point that obtains sent to peak value offset factor computing module;
Peak value offset factor computing module is according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals needed peak value offset factor under the predetermined threshold value thereby calculate;
The peak value offset factor that calculates is multiplied each other with a plurality of forming filter coefficients respectively, and then after obtaining the signal of multichannel, the signal of described multichannel is sued for peace;
The signal peak of the signal that obtains after the summation with the first time-delay alignment modules output subtracted each other, thereby realize I, Q two ways of digital signals are reduced the peak-to-average force ratio processing.
Further, described step S1, it is specially:
Signal input unit is carried out analog frequency mixing, analog-to-digital conversion, IQ correction, extraction, level control and interpolation filtering processing successively to the signal that receives antenna reception, and then exports I, Q two ways of digital signals.
Further, described step S3 comprises:
S31, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are carried out analog-to-digital conversion, and then obtain I, Q two-way analog signal;
S32, I, Q two-way analog signal are carried out going out by transmission antennas transmit after analog frequency mixing and power amplifier amplify successively.
Further, peak value offset factor computing module is according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals under the predetermined threshold value in needed this step of the peak value offset factor thereby calculate, the computing formula of the described peak value offset factor is:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
Further, the described absolute value block of asking is carried out absolute value calculating to I, Q two ways of digital signals, and then obtains in this step of absolute value signal of I, Q two ways of digital signals, and the computing formula of described absolute value signal is:
Wherein, the absolute value signal of IQ for I, Q two ways of digital signals are obtained after definitely calculating; I is the actual signal data of I digital signal; Q is the actual signal data of Q digital signal.
Another technical scheme of the present invention is: a kind of communication system of processing based on efficient CFR, comprise that thereby signal input unit, signal output unit and at least one are used for subtracting each other the CFR processing module that realizes reducing peak-to-average force ratio by forming filter coefficient and corresponding signal peak, the signal of described signal input unit output is exported by at least one CFR processing module and then from signal output unit.
Further, described CFR processing module comprise first the time-delay alignment modules, ask absolute value block, second the time-delay alignment modules, summation module and a plurality of forming filter coefficient module be used to being output into the mode filter coefficient, described first the time-delay alignment modules output be connected with the peak value subtraction module;
The described output of absolute value block of asking is connected with peak detection block and peak value offset factor computing module in turn, the output of described peak value offset factor computing module is connected with respectively a plurality of multipliers, another input of described a plurality of multipliers connects one to one with the output of a plurality of forming filter coefficient module respectively, the output of described a plurality of multipliers all is connected with the input of summation module, and the output of described summation module is connected with the input of peak value subtraction module;
The output of described the second time-delay alignment modules is connected with the input of peak detection block.
Further, described signal input unit comprises reception antenna, the output of described reception antenna is connected with the first analog frequency mixing module, analog to digital converter, IQ correction module, abstraction module, automatic electric-level control module and filter in turn, and the signal of described filter output is exported by at least one CFR processing module and then from signal output unit.
Further, adopt following computing formula and then the calculating peak value offset factor in the described peak value offset factor computing module:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
The invention has the beneficial effects as follows: thereby because method of the present invention is to subtract each other with corresponding signal peak by the forming filter coefficient to realize reducing peak-to-average force ratio, therefore only need the forming filter coefficient is changed accordingly, so just the energy flexible Application is in the system of multicarrier and different systems, and the method for the application of the invention, can greatly reduce the distortion factor of signal, and can guarantee good error vector magnitude and low peak-to-average force ratio, can improve digital predistortion function in addition, thereby utilance is improved greatly.
Another beneficial effect of the present invention is: thereby because realization reduction peak-to-average force ratio subtracts each other by forming filter coefficient and corresponding signal peak in system of the present invention, therefore only need the forming filter coefficient is carried out corresponding change, system of the present invention so just can support the system of multicarrier and the system of different systems, thereby greatly improve the application flexibility of system of the present invention, and the system of the application of the invention, can greatly reduce the distortion factor of signal, and can guarantee good error vector magnitude and low peak-to-average force ratio, can improve digital predistortion function in addition, thereby utilance is improved greatly.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:
Fig. 1 is the flow chart of steps of a kind of communication means of processing based on efficient CFR of the present invention;
Fig. 2 is a specific embodiment flow chart of steps of a kind of communication means of processing based on efficient CFR of the present invention;
Fig. 3 is the structural representation of a kind of communication system of processing based on efficient CFR of the present invention;
Fig. 4 is the structural representation of a specific embodiment of a kind of communication system of processing based on efficient CFR of the present invention;
Fig. 5 is a kind of structural representation based on CFR processing module in the communication system of efficient CFR processing of the present invention;
Fig. 6 is a kind of time domain schematic diagram based on forming filter coefficient in communication means one specific embodiment of efficient CFR processing of the present invention;
Fig. 7 is the time domain schematic diagram that is applicable to the forming filter coefficient of three carrier waves in a kind of communication means one specific embodiment based on efficient CFR processing of the present invention;
Fig. 8 is a kind of time domain schematic diagram based on the first absolute value signal in communication means one specific embodiment of efficient CFR processing of the present invention;
Fig. 9 is a kind of time domain schematic diagram based on the second absolute value signal in communication means one specific embodiment of efficient CFR processing of the present invention;
Figure 10 is a kind of time domain schematic diagram based on the 3rd absolute value signal in communication means one specific embodiment of efficient CFR processing of the present invention;
Figure 11 is a kind of time domain schematic diagram based on the 4th absolute value signal in communication means one specific embodiment of efficient CFR processing of the present invention;
Figure 12 be in a kind of communication means one specific embodiment of processing based on efficient CFR of the present invention pentasyllabic quatrain to the time domain schematic diagram of value signal;
Figure 13 is the time domain schematic diagram of the 6th absolute value signal;
Figure 14 is the time domain schematic diagram of the forming filter coefficient corresponding with the peak point found out among Figure 13;
Figure 15 is the signal time domain schematic diagram after the 6th absolute value signal realizes peak clipping.
Embodiment
By shown in Figure 1, a kind of communication means of processing based on efficient CFR, the method comprises:
S1, the signal that receives antenna reception is processed, and then output I, Q two ways of digital signals;
Thereby S2, subtract each other by forming filter coefficient and corresponding signal peak and I, Q two ways of digital signals to be reduced peak-to-average force ratio process;
S3, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are launched after processing.
Be further used as preferred embodiment, described step S2 comprises:
The first time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
The second time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
Ask absolute value block that I, Q two ways of digital signals are carried out absolute value and calculate, and then obtain the absolute value signal of I, Q two ways of digital signals;
Peak detection block is according to default threshold value and the absolute value signal that calculates, thereby detect the peak value above predetermined threshold value, thereby detect the peak point corresponding with this peak value, and obtain the I corresponding with detected peak point, Q actual signal data according to detected peak point and then from the second time-delay alignment modules, and I, Q actual signal data and the absolute value corresponding with peak point that obtains sent to peak value offset factor computing module;
Peak value offset factor computing module is according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals needed peak value offset factor under the predetermined threshold value thereby calculate;
The peak value offset factor that calculates is multiplied each other with a plurality of forming filter coefficients respectively, and then after obtaining the signal of multichannel, the signal of described multichannel is sued for peace;
The signal peak of the signal that obtains after the summation with the first time-delay alignment modules output subtracted each other, thereby realize I, Q two ways of digital signals are reduced the peak-to-average force ratio processing.
Be further used as preferred embodiment, described step S3 comprises:
S31, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are carried out analog-to-digital conversion, and then obtain I, Q two-way analog signal;
S32, I, Q two-way analog signal are carried out going out by transmission antennas transmit after analog frequency mixing and power amplifier amplify successively.
By shown in Figure 2, an a kind of specific embodiment of the communication means of processing based on efficient CFR, the method comprises:
S1, signal input unit are carried out successively analog frequency mixing, analog-to-digital conversion, IQ correction, extraction, level control and interpolation filtering processing to the signal that receives antenna reception, and then are exported I, Q two ways of digital signals.At this moment, the I of output, Q two ways of digital signals are high peak-to-average force ratio signal.
S21, the first time-delay alignment modules are to I, the Q two ways of digital signals aligning of delaying time.This step mainly is that both can accurately correspondingly subtract each other for the signal that I, Q two ways of digital signals and summation module are exported.
S22, the second time-delay alignment modules are to I, the Q two ways of digital signals aligning of delaying time.This step mainly is in order to make the peak detection block can be according to detected peak point, thereby obtains exactly the I corresponding with detected peak point, Q actual signal data.
S23, ask absolute value block that I, Q two ways of digital signals are carried out absolute value to calculate, and then obtain the absolute value signal of I, Q two ways of digital signals.And by adopting this step, with regard to realizing I, Q two-way are offset, that is to say that to work as I very large, the very little and absolute value that calculates of Q also can carry out peak value offset to I, Q two-way during greater than predetermined threshold value simultaneously.So just can guarantee the balance of I, Q two-way.
S24, peak detection block are according to default threshold value and the absolute value signal that calculates, thereby detect the peak point above predetermined threshold value, and obtain the I corresponding with detected peak point, Q actual signal data according to detected peak point and then from the second time-delay alignment modules, and I, Q actual signal data and the absolute value corresponding with peak point that obtains sent to peak value offset factor computing module.
S25, peak value offset factor computing module be according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals needed peak value offset factor under the predetermined threshold value thereby calculate.
S26, the peak value offset factor that calculates is multiplied each other with a plurality of forming filter coefficients respectively, and then after obtaining the signal of multichannel, the signal of described multichannel is sued for peace.
The signal peak of S27, the signal that obtains after will suing for peace and the first time-delay alignment modules output subtracts each other, thereby realizes that I, Q two ways of digital signals are reduced peak-to-average force ratio to be processed.And this step is by adopting peak value subtraction module and then realization, and described peak value subtraction module subtracter namely.And the signal peak of the signal that described peak value subtraction module will obtain after will suing for peace and the first time-delay alignment modules output subtracts each other, thereby realize that I, Q two ways of digital signals are reduced peak-to-average force ratio to be processed, like this so that signal distortion is little, described peak value subtraction module is to process when detecting just simultaneously, and then can reduce workload.
S31, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are carried out analog-to-digital conversion, and then obtain I, Q two-way analog signal.
S32, I, Q two-way analog signal are carried out going out by transmission antennas transmit after analog frequency mixing and power amplifier amplify successively.
For the above embodiments, wherein there is not inevitable precedence between step S21, step S22 and the step S23 three, and being carried out label, these three steps just in order to be easy to these three steps are described in detail.
Step S1 for above-mentioned is described further, and it comprises:
S11, signal input unit are carried out the analog frequency mixing processing to the signal that receives antenna reception, and then obtain I, the Q two-way analog signal of zero-frequency;
S12, I, Q two-way analog signal are carried out analog-to-digital conversion, and then obtain I, Q two ways of digital signals;
S13, I, Q two ways of digital signals are carried out IQ proofread and correct;
S14, I, Q two ways of digital signals after IQ proofreaied and correct extract, thereby reduce the I after IQ proofreaies and correct, the speed of Q two ways of digital signals;
S15, I, Q two ways of digital signals after extracting are carried out level control, with the protection power amplifier;
S16, I, Q two ways of digital signals after the level control are carried out interpolation filtering.
For above-mentioned step S23, the computing formula of wherein said absolute value signal is:
Wherein, the absolute value signal of IQ for I, Q two ways of digital signals are obtained after definitely calculating; I is the actual signal data of I digital signal; Q is the actual signal data of Q digital signal.
As shown in Figure 8, it is the absolute value signal schematic diagram of a specific embodiment, and according to Fig. 8, further step S24 is further specified.Suppose that default threshold value is 7800, so as shown in Figure 8,8150 these absolute values are the peak value that exceeds predetermined threshold value, and the point of transverse axis corresponding to 8150 these peak values is 2760,2760 is described peak point so.And according to detected peak point, just can obtain exactly the I corresponding with this peak point, Q actual signal data from the second time-delay alignment modules.
In step S25, the computing formula of the described peak value offset factor is:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
By shown in Figure 3, a kind of communication system of processing based on efficient CFR, comprise that thereby signal input unit, signal output unit and at least one are used for subtracting each other the CFR processing module that realizes reducing peak-to-average force ratio by forming filter coefficient and corresponding signal peak, the signal of described signal input unit output is exported by at least one CFR processing module and then from signal output unit.
Be further used as preferred embodiment, the number of described CFR processing module is at least two, and described at least two CFR processing modules connect between the input of the output of signal input unit and signal output unit, as shown in Figure 4.If adopt two CFR processing modules, can make effect reach ideal state.And actual lower plate test result is when peak-to-average force ratio is cut 6～6.5dB from 11～12dB, and error vector magnitude EVM worsens 1.5～2%.
Be further used as preferred embodiment, as shown in Figure 5, described CFR processing module comprise first the time-delay alignment modules, ask absolute value block, second the time-delay alignment modules, summation module and a plurality of forming filter coefficient module be used to being output into the mode filter coefficient, described first the time-delay alignment modules output be connected with the peak value subtraction module;
The described output of absolute value block of asking is connected with peak detection block and peak value offset factor computing module in turn, the output of described peak value offset factor computing module is connected with respectively a plurality of multipliers, another input of described a plurality of multipliers connects one to one with the output of a plurality of forming filter coefficient module respectively, the output of described a plurality of multipliers all is connected with the input of summation module, and the output of described summation module is connected with the input of peak value subtraction module;
The output of described the second time-delay alignment modules is connected with the input of peak detection block.And the input of input, the input of asking absolute value block and the second delay circuit alignment modules of described the first time-delay alignment modules is the input of CFR processing module, and the output of described peak value subtraction module is the output of CFR processing module.
The below is described further the modules in the CFR processing module.
Described the first time-delay alignment modules is for aligning that I, Q two ways of digital signals are delayed time;
Described the second time-delay alignment modules is for aligning that I, Q two ways of digital signals are delayed time;
Ask absolute value block, be used for that I, Q two ways of digital signals are carried out absolute value and calculate, and then obtain the absolute value signal of I, Q two ways of digital signals;
Peak detection block, be used for according to default threshold value and the absolute value signal that calculates, thereby detect the peak value above predetermined threshold value, thereby detect the peak point corresponding with this peak value, and obtain the I corresponding with detected peak point, Q actual signal data according to detected peak point and then from the second time-delay alignment modules, and I, Q actual signal data and the absolute value corresponding with peak point that obtains sent to peak value offset factor computing module;
Peak value offset factor computing module is used for according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals needed peak value offset factor under the predetermined threshold value thereby calculate;
The forming filter coefficient module is used for being output into the mode filter coefficient;
Multiplier is used for the peak value offset factor that calculates is multiplied each other with a plurality of forming filter coefficients respectively, and then obtains the signal of multichannel;
Summation module is used for the signal of a plurality of multiplier outputs is sued for peace;
The peak value subtraction module, the signal peak of the signal that obtains after being used for suing for peace and the first time-delay alignment modules output subtracts each other, thereby realizes that I, Q two ways of digital signals are reduced peak-to-average force ratio to be processed.And described peak value subtraction module is to detect in the time of need to carrying out additive operation, just can carry out peak value and subtract each other, and so just can reduce workload.And as shown in figure 13, it asks the schematic diagram of absolute value signal for original signal, and as seen from Figure 13, the value of some is to exceed default threshold value in this absolute value signal, and from these exceed the absolute value of predetermined threshold value, find peak value, thereby find corresponding peak point.And shown in Figure 14 be the forming filter coefficient corresponding with the peak point found out among Figure 13, therefore after forming filter coefficient and the peak value offset factor multiply each other, carry out the signal of realizing peak clipping that draws after peak value subtracts each other as shown in figure 15 with absolute value signal shown in Figure 13.
And for the forming filter coefficient module, its forming filter coefficient mainly is according to dissimilar systems and whether is applied to multicarrier system, thereby arrange.And requiring of the required forming filter of dissimilar systems is as shown in table 1:
By shown in the table 1, what its first row represented is dissimilar systems, and ntaps is expressed as filter order, and Fc is expressed as pass band width, and fs is expressed as operating rate, and Dpass_dB represents passband fluctuation, and Dstop_dB represents Out-of-band rejection.And Dpass=10^ (Dpass_dB/20), Dstop=10^ (Dstop_dB/20), wherein Dpass and Dpass_dB all represent passband fluctuation, just both units are different, similarly, Dstop and Dstop_dB all represent Out-of-band rejection, and just both units are different.
In addition, when design WCDMA, filter order is 2*fs as shown in Table 1, and fs is operating rate.And when designing for WCDMA, its operating rate fs is 76.8Mps, so filter order is 154 rank, and pass band width is 1.85, and Dpass_dB and Dstop_dB then convert through above-mentioned formula.Therefore the forming filter coefficient that obtains at last as shown in Figure 6.And as shown in Figure 8, the main lobe width of available counteracting is at 20～30 points, and is namely more at the peakedness ratio that satisfies predetermined threshold value, when namely having 8 peaks to satisfy thresholding in 154 points, just can satisfy with 8 multipliers, correspondingly, the number of forming filter coefficient module is 8.And when the 9th peak that satisfies thresholding occurred, first multiplier is complete 154 points as calculated, and first multiplier is taken the 9th peak again and carried out multiplexing getting final product so.And for the design of multi-carrier filter coefficient, its needs get final product weight coefficient in the frequency conversion of the enterprising line number word of MATLAB.The design of filter instrument fdatool that perhaps can adopt MATLAB to carry, when for example designing three carrier filter coefficients, the band pass filter that can design an intermediate frequency is added the low pass filter of a zero-frequency.And the present invention is when adopting the second method for designing, and the forming filter coefficient of three carrier waves as shown in Figure 7.
And when designing for WCDMA, absolute value signal is carried out peak value detect, the rule that its peak value detects such as Fig. 8 are to shown in Figure 12.As shown in Figure 8, it is the most normal situation, only have single peak, and counting of this peak only has about 30 points, and is similar with the above-mentioned main lobe width that is mentioned to, and at this moment, then is judged as single peak.And Fig. 9 and the same situation that all belongs to shown in Figure 10 have two peak values simultaneously, and must judge into two peak values this moment.And shown in Figure 11, it is counted and surpasses above-mentioned main lobe width, and can produce certain error this moment, and for the judgement of this situation, if count when surpassing 40 points, then will enter and nextly judge, but at this moment the peak value of two weight coefficients will lean on too closely, also can produce certain error.As shown in figure 12, its peak value is when larger, and it can descend first one or two and again rise, at this moment, descends and counts not, therefore will judge into a peak value.
Be further used as preferred embodiment, described signal input unit comprises reception antenna, the output of described reception antenna is connected with the first analog frequency mixing module, analog to digital converter, IQ correction module, abstraction module, automatic electric-level control module and filter in turn, and the signal of described filter output is exported by at least one CFR processing module and then from signal output unit.
Be further used as preferred embodiment, described signal output unit comprises digital to analog converter, and the output of described digital to analog converter is connected with the second analog frequency mixing module, power amplifier and transmitting antenna in turn; The signal of described signal input unit output is successively by at least one CFR processing module, digital to analog converter, the second analog frequency mixing module, power amplifier and transmitting antenna and then output.
And described IQ correction module, abstraction module, automatic electric-level control module, filter and CFR processing module are by FPGA and then realization.
Be further used as preferred embodiment, adopt following computing formula in the described peak value offset factor computing module and then calculate the peak value offset factor:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
Be further used as preferred embodiment the described absolute value signal that adopts following computing formula in the absolute value block and then calculate I, Q two ways of digital signals of asking:
Wherein, the absolute value signal of IQ for I, Q two ways of digital signals are obtained after definitely calculating; I is the actual signal data of I digital signal; Q is the actual signal data of Q digital signal.
And by using above-mentioned the present invention, can support the system of multicarrier and the system of different systems, thereby greatly improve the flexibility that the present invention uses.And the application of the invention, the distortion factor of signal can be greatly reduced, and good error vector magnitude and low peak-to-average force ratio can be guaranteed, in addition, can also improve digital predistortion function, thereby utilance is improved greatly.
More than be that better enforcement of the present invention is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art make all equivalent variations or replacement also can doing under the prerequisite of spirit of the present invention, the distortion that these are equal to or replace all is included in the application's claim limited range.
Claims (10)
1. communication means of processing based on efficient CFR, it is characterized in that: the method comprises:
S1, the signal that receives antenna reception is processed, and then output I, Q two ways of digital signals;
Thereby S2, subtract each other by forming filter coefficient and corresponding signal peak and I, Q two ways of digital signals to be reduced peak-to-average force ratio process;
S3, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are launched after processing.
2. described a kind of communication means of processing based on efficient CFR according to claim 1, it is characterized in that: described step S2 comprises:
The first time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
The second time-delay alignment modules is to I, the Q two ways of digital signals aligning of delaying time;
Ask absolute value block that I, Q two ways of digital signals are carried out absolute value and calculate, and then obtain the absolute value signal of I, Q two ways of digital signals;
Peak detection block is according to default threshold value and the absolute value signal that calculates, thereby detect the peak value above predetermined threshold value, thereby detect the peak point corresponding with this peak value, and obtain the I corresponding with detected peak point, Q actual signal data according to detected peak point and then from the second time-delay alignment modules, and I, Q actual signal data and the absolute value corresponding with peak point that obtains sent to peak value offset factor computing module;
Peak value offset factor computing module is according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals needed peak value offset factor under the predetermined threshold value thereby calculate;
The peak value offset factor that calculates is multiplied each other with a plurality of forming filter coefficients respectively, and then after obtaining the signal of multichannel, the signal of described multichannel is sued for peace;
The signal peak of the signal that obtains after the summation with the first time-delay alignment modules output subtracted each other, thereby realize I, Q two ways of digital signals are reduced the peak-to-average force ratio processing.
3. described a kind of communication means of processing based on efficient CFR according to claim 1 is characterized in that: described step S1, and it is specially:
Signal input unit is carried out analog frequency mixing, analog-to-digital conversion, IQ correction, extraction, level control and interpolation filtering processing successively to the signal that receives antenna reception, and then exports I, Q two ways of digital signals.
4. described a kind of communication means of processing based on efficient CFR according to claim 1, it is characterized in that: described step S3 comprises:
S31, the I, the Q two ways of digital signals that reduce behind the peak-to-average force ratio are carried out analog-to-digital conversion, and then obtain I, Q two-way analog signal;
S32, I, Q two-way analog signal are carried out going out by transmission antennas transmit after analog frequency mixing and power amplifier amplify successively.
5. described a kind of communication means of processing based on efficient CFR according to claim 2, it is characterized in that: peak value offset factor computing module is according to the I, Q actual signal data and the absolute value corresponding with peak point that obtain, can be the peak value offset of I, Q two ways of digital signals under the predetermined threshold value in needed this step of the peak value offset factor thereby calculate, the computing formula of the described peak value offset factor is:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
6. described a kind of communication means of processing based on efficient CFR according to claim 2, it is characterized in that: the described absolute value block of asking is carried out absolute value calculating to I, Q two ways of digital signals, and then obtain in this step of absolute value signal of I, Q two ways of digital signals, the computing formula of described absolute value signal is:
Wherein, the absolute value signal of IQ for I, Q two ways of digital signals are obtained after definitely calculating; I is the actual signal data of I digital signal; Q is the actual signal data of Q digital signal.
7. communication system of processing based on efficient CFR, it is characterized in that: thus comprise that signal input unit, signal output unit and at least one are used for subtracting each other the CFR processing module that realizes reducing peak-to-average force ratio by forming filter coefficient and corresponding signal peak, and the signal of described signal input unit output is exported by at least one CFR processing module and then from signal output unit.
8. described a kind of communication system of processing based on efficient CFR according to claim 7, it is characterized in that: described CFR processing module comprise first the time-delay alignment modules, ask absolute value block, second the time-delay alignment modules, summation module and a plurality of forming filter coefficient module be used to being output into the mode filter coefficient, described first the time-delay alignment modules output be connected with the peak value subtraction module;
The described output of absolute value block of asking is connected with peak detection block and peak value offset factor computing module in turn, the output of described peak value offset factor computing module is connected with respectively a plurality of multipliers, another input of described a plurality of multipliers connects one to one with the output of a plurality of forming filter coefficient module respectively, the output of described a plurality of multipliers all is connected with the input of summation module, and the output of described summation module is connected with the input of peak value subtraction module;
The output of described the second time-delay alignment modules is connected with the input of peak detection block.
9. described a kind of communication system of processing based on efficient CFR according to claim 7, it is characterized in that: described signal input unit comprises reception antenna, the output of described reception antenna is connected with the first analog frequency mixing module, analog to digital converter, IQ correction module, abstraction module, automatic electric-level control module and filter in turn, and the signal of described filter output is exported by at least one CFR processing module and then from signal output unit.
10. described a kind of communication system of processing based on efficient CFR according to claim 8 is characterized in that: adopt following computing formula in the described peak value offset factor computing module and then calculate the peak value offset factor:
Wherein, L is the threshold value of presetting; S is the absolute value corresponding with peak point; W is the central point of filter coefficient; I is the I actual signal data; Q is the Q actual signal data;
Can be the peak value offset of I digital signal needed peak value offset factor under the predetermined threshold value;
Can be the peak value offset of Q digital signal needed peak value offset factor under the predetermined threshold value.
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