CN102075484A - Method and device for reducing peak-to-average power ratio of signal - Google Patents
Method and device for reducing peak-to-average power ratio of signal Download PDFInfo
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Abstract
The invention provides a device for reducing the peak-to-average power ratio of a signal. The device comprises a peak value detection module, an interpolation module, a peak value re-searching module, a peak value time delay evaluation module, a peak value pulse scheduling module, a time delay module and a certified program generator (CPG) module, wherein a signal to be subjected to peak clipping passes through the peak value detection module to form a first detected peak value signal; the interpolation module interpolates the peak value signal detected for the first time into the second sampling velocity; the peak value re-searching module detects the peak value for the second time, and a peak clipping processing threshold is deducted from the peak value for the second time to extract counteract impulse; the peak value time delay evaluation module compares position change of searched peak values before and after interpolation to acquire time delay information; the peak value pulse scheduling module extracts a coefficient of a CPG filter according to the time delay information; and the CPG module multiplies the coefficient of the CPG filter by the counteract impulse to generate peak value counteract impulse, processes the peak value counteract impulse with the signal to be subjected to peak clipping, and outputs a clipped signal. The invention also provides a method for reducing the peak-to average power ratio of the signal. By the device and the method, the precision and accuracy of peak value detection can be improved.
Description
Technical field
The present invention relates to the system and method for the Digital Signal Processing of moving communicating field, more particularly, is the method and apparatus that reduces the signal peak-to-average ratio of ingoing power amplifier in the communication system.
Background technology
The frequency spectrum resource that mobile communication carrier obtains generally is discontinuous, often is dispersed in different frequency ranges.The technology that a plurality of frequency ranges operations in base station are at present adopted all is independent power amplifier, closes the mode on road again, and its shortcoming is the cost height, efficient is low, volume is big.Along with environment and energy pressure are serious day by day, Carrier Requirements adopts a base station to support a plurality of frequency ranges operations, and the technology of the shared power amplifier of multiband is embodying huge advantage aspect cost, efficient and the volume, also is the developing direction of future mobile communications.
In mobile communication system, general intermediate frequency peak clipping algorithm is that peak pulse is offset the peak clipping technology at present.It is based on the stack thought of signal, and it is identical to produce a phase place, and amplitude and the proportional cancellation pulses of peak value size are carried out spectrum shaping to cancellation pulses and handled, and carry out peak value offset with primary signal then.Generate the cancellation pulses method as hard-limiting, obtain good peak-to-average force ratio performance and can cause serious neighboring trace to leak simultaneously, increase the realization resource of back Design of Filter.And for example adopt the mode of mark filtering interpolation to increase the precision that peak value detects, improve the peak clipping performance, but bigger for the broadband configuring condition consumption hardware resource of multiband.
But based on existing peak clipping technology, can not adapt to the requirement of the shared power amplifier of multiband, particularly can't reach under four times of situations of signal bandwidth in multiple frequency bands broadband configuration signal peak clipping speed, cause the possibility harm of missing the big peak value of part because of peak clipping speed is low excessively, the precision and the accuracy that cause peak value to detect reduce.
So,, be necessary the peak clipping technology of multiband is studied in order further to improve the implementation complexity of power amplification efficiency and reduction peak clipping.
Summary of the invention
The object of the present invention is to provide a kind of method and apparatus of reduction signal peak-to-average ratio of broadband, cause the precision of peak value detection and the problem that accuracy reduces because of peak clipping speed is low to solve existing peak pulse counteracting peak clipping technology.
The invention provides a kind of device that reduces signal peak-to-average ratio, described device comprises: peak detection block, interpolating module, peak value be search module, peak value time delay estimation module, peak pulse scheduler module, time delay module and cancellation pulses generator (CPG) module again; Wherein,
Treat the peak clipping signal through described peak detection block, detect peak signal information for the first time, be sent to described interpolating module according to the output of peak value detection threshold;
Described interpolating module is interpolated into second sampling rate with the signal that detects for the first time peak value by first sampling rate, sends into described peak value search module again;
Described peak value search module again carries out second time peak value and detects, and detected peak information subtracts each other with peak clipping processing thresholding and extracts cancellation pulses for the second time;
Described peak value time delay estimation module relatively searches the variations in peak situation before and after the interpolation, obtains error time delay information;
Described peak pulse scheduler module goes out the CPG filter coefficient according to the time delay information extraction of described peak value time delay estimation module output, is input to the CPG module;
Described CPG module multiplies each other CPG filter coefficient and cancellation pulses and produces the peak value offset pulse, and described peak value offset pulse is handled by described time delay module with treating the peak clipping signal, signal after the output peak clipping.
Further, described device also further comprises CORDIC (CORDIC) conversion module, and described CORDIC conversion module is treated the peak clipping signal and carried out the CORDIC conversion, obtains the amplitude and the phase information of signal, sends into described peak detection block.
Further, described device also further comprises the CORDIC inverse transform block, and described CORDIC inverse transform block is searched for peak value again and obtained the error signal that peak value and peak clipping handle after thresholding subtracts each other and carry out the CORDIC inverse transformation, generates the cancellation pulses signal.
Further, described peak value time delay estimation module comprises mark time delay estimation unit and integer time delay estimation unit, wherein, the interpolation multiple information that the utilization of described mark time delay estimation unit sets in advance, and from described peak detection block and the peak value peak information of search module output again, obtain mark time delay information, finish the mark time delay alignment of interpolation front and back peak value; The interpolation multiple information that the utilization of described integer time delay estimation unit sets in advance, and from described peak detection block and the peak value peak information of search module output again, obtain integer time delay information, described integer time delay information and described mark time delay information via adder are merged into time delay information.
Further, described device also further comprises pulse shaping filter coefficient storage module, be used to store the CPG pulsed filter coefficient of many groups through the mark time delay processing, described peak pulse scheduler module extracts the CPG filter coefficient according to the time delay information of described peak value time delay estimation module output from pulse shaping filter coefficient storage module.
The present invention also provides a kind of method that reduces signal peak-to-average ratio, and described method comprises:
The amplitude and the phase place of peak clipping signal treated in step 1, acquisition, and the detection peak position;
Further, in the step 1, adopt CORDIC (CORDIC) iterative algorithm to receive amplitude and the phase information for the treatment of the peak clipping signal.
Further, in the step 1, obtain to treat the amplitude and the detection threshold thr of peak clipping signal through the CORDIC iterative algorithm
DetectCompare, determine greater than detection threshold thr
DetectPeak.
Further, in the step 3, a plurality of peak values in the signal after the interpolation are compared, keep a wherein maximum peak amplitude Mag
MaxWith phase place Phase
Max
Further, in the step 4, peak value searched for again obtain peak value and peak clipping and handle the error signal that thresholding subtracts each other and carry out the CORDIC inverse transformation, generate cancellation pulses.
Further, described step 5 further comprises:
Step 51, estimation peak value time delay comprise mark time delay and integer time delay part, relatively search the variations in peak situation before and after the interpolation, obtain mark time delay information, estimate the required time delay of peak detection process, obtain integer time delay information;
Step 52, selection cancellation pulses filter coefficient according to different mark time delay information, read corresponding CPG pulsed filter coefficient;
Step 53, a plurality of peak values that search in the cancellation pulses forming filter progression length are distributed and handle;
Step 54, multiply each other, produce the peak value offset pulse according to the CPG pulsed filter coefficient and the cancellation pulses that obtain.
Further, described method further comprises, and treats the peak clipping signal and carries out multistage peak clipping iterative processing.
The present invention offsets the peak clipping technology with traditional peak pulse and compares, increased interpolation peak value search module again, can't reach under four times of situations of signal bandwidth in multiple frequency bands broadband configuration signal peak clipping speed, improve precision and the accuracy that peak value detects by interpolation method, reduced under the not obvious increase hardware spending situation miss big peak value possibility of part and interpolation because of sampling rate is low excessively after the harm of peak value regeneration, improved the peak-to-average force ratio performance.The present invention can obtain better peak clipping effect satisfying under same error amplitude of the vector and adjacent-channel power leak than index condition.Reduced the peak clipping processing speed by interpolation method, do not influenced under the situation of peak clipping performance and saved whole hardware resource.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is that a kind of broadband that the embodiment of the invention provides reduces signal peak-to-average power ratio device basic structure schematic diagram;
Fig. 2 is a peak value interpolating module concrete structure schematic diagram;
Fig. 3 is a peak value time delay estimation module concrete structure schematic diagram;
Fig. 4 is the peak value timing distribution figure before and after the broadband signal interpolation;
Fig. 5 is the concrete schematic diagram of pulse shaping filter coefficient storage;
Fig. 6 is the method that a kind of broadband that the embodiment of the invention provides reduces signal peak-to-average ratio;
Fig. 7 is that a kind of broadband reduces the method for signal peak-to-average ratio at F of TD-SCDMA system and A two-band specific embodiment.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 is the structural representation that a kind of broadband that the embodiment of the invention provides reduces the device of signal peak-to-average ratio.As shown in Figure 1, the broadband reduces the signal peak-to-average power ratio device and comprises CORDIC (COordinate Rotation DIgital Computer, CORDIC) conversion module, peak detection block, interpolating module, peak value is search module, CORDIC inverse transform block, peak value time delay estimation module, pulse shaping filter memory module, peak pulse scheduler module, time delay module and CPG (Cancellation Pulse Generator, cancellation pulses generator) module again.Wherein:
Described CORDIC conversion module adopts the CORDIC iterative algorithm that the peak clipping signal for the treatment of of high peak-to-average force ratio is carried out the CORDIC conversion, finishes signal and changes from the plane coordinates to polar coordinates, obtains the amplitude and the phase information of signal.
Wherein, the CORDIC iterative algorithm is the transform method of general a kind of polar coordinates and plane coordinates during FPGA realizes.Related algorithm is as described below:
If it is I that road I/Q complex signal is closed in input
k, Q
k, the peak clipping thresholding is Thr, the cordic algorithm gain is cordic_gain.
The initial value of iterative computation
{ x (0), y (0), z (0) }={ abs (I
k), abs (Q
k), 0} (formula 1)
The iterative computation formula:
X (i+1)=x (i)+sign (y (i)) * floor (y (i)/2
(i-1)) (formula 2)
Y (i+1)=y (i)-sign (y (i)) * floor (x (i)/2
(i-1)) (formula 3)
Z (i+1)=z (i)+sign (y (i)) * a tan ((1/2)
(i-1)) (formula 4)
After i iteration of process, the x of output (i+1) is an amplitude information, and z (i+1) is a phase information.
Described peak detection block is finished the function that peak value detects according to the signal after the CORDIC conversion, to amplitude and the detection threshold thr through signal after the CORDIC conversion
DetectCompare, determine greater than detection threshold thr
DetectPeak.Described peak detection block adopts four point search methods to detect, and successively four adjacent points of each group is carried out peak and judges that relatively four point search methods search the amplitude and the detection threshold thr of peak value
Detect, if search the amplitude of peak value greater than detection threshold thr
Detect, then output detects the amplitude and the phase information of peak value for the first time.
Wherein, the judgment criterion of described four point search methods is: to 4 adjacent successively some A, B, C, the amplitude mag_a of D, mag_b, mag_c, mag_d judges, B is current judging point, and greater than mag_a, mag_c is not less than under the situation of mag_d as if mag_b, if mag_b is not less than mag_c, B just is a peak so.
Described interpolating module carries out interpolation processing to the signal that detects in the peak value window scope of peak value place, detects peak value x (n) in the peak value window scope of peak value place for the first time, and adopt following formula to carry out multiphase filtering and handle,
Wherein, N
FIBe low pass filter length, h
FIBe low pass filter device coefficient, n represents n sampled signal, and m represents m coefficient of filter.
Fig. 2 is an interpolating module concrete structure schematic diagram.Input signal x (n) copies as 3 road signals through reproducer, respectively with the coefficient { h of interpolation filter
2, h
5, h
8, { h
1, h
3, h
7And { h
0, h
3, h
6Carry out process of convolution, and obtain phase0, phase1 and phase2 road signal y (3m+1), y (3m+2) and y (3m+3), be to be y (n) behind one road signal through serial to parallel conversion again.Wherein
Expression round numbers part.
Described peak value is search module again, and a plurality of peak values in the signal y (n) after the interpolation are compared, and keeps a wherein maximum peak amplitude Mag
MaxWith phase place Phase
MaxSending into peak value time delay estimation module and CORDIC inverse transform block handles.Peak value is the peak amplitude Mag of search module output again
MaxHandle thresholding thr with peak clipping
ProcessCompare, obtain the amplitude Mag of error signal
ErrorWith phase place Phase
MaxInformation is sent into the CORDIC inverse transform block and is handled.
Mag
Error=Mag
Max-thr
Process(formula 6)
Broadband signal some peak value under low sampling rate is to be lower than peak clipping to handle thresholding thr
Process, but through after the up-sampling, can be higher than detection threshold thr
Detect, for fear of missing peak value regeneration after part peak value and the interpolation, peak value is handled thresholding thr
ProcessBe higher than detection threshold thr
Detect
Described CORDIC inverse transform block is used for peak value searched for again and obtains peak value and peak clipping and handle the error signal that thresholding subtracts each other and carry out the CORDIC inverse transformation, finishes signal and is changed to plane coordinates by polar coordinates, and generation cancellation pulses required I road and Q road signal are respectively I
PulseAnd Q
Pulse
Described peak value time delay estimation module relatively searches the variations in peak situation before and after the interpolation, obtains error time delay information accurately.As shown in Figure 3 be peak value time delay estimation module concrete structure schematic diagram.Described peak value time delay estimation module comprises mark time delay estimation unit and integer time delay estimation unit.Wherein:
Described mark time delay estimation unit is used to finish the mark time delay alignment function of peak value before and after the interpolation.The interpolation multiple information that system sets in advance, and behind peak detection block and the peak value described mark time delay estimation unit of peak information (comprising amplitude and phase information) process that search module is exported again, obtain mark time delay information.
By the peak value timing distribution figure before and after Fig. 4 broadband signal interpolation as can be seen, detection peak under low rate, the peak value of handling may not be a peak-peak under the high sampling rate, and peak-peak does not have complete matching under cancellation pulses and the high sampling rate, and peak value regeneration can appear to the signal after the peak clipping in processing through up-sampling.Adopt mark time delay estimation unit can overcome this shortcoming, improve Peak detection accuracy, reduce peak value regeneration harm.
Described integer time delay estimation unit be used for estimating for the first time that peak value detects and for the second time peak value search for again and bring integer time delay part, the interpolation multiple information that system sets in advance, and behind peak detection block and the peak value described integer time delay estimation unit of peak information (comprising amplitude and phase information) process that search module is exported again, obtain integer time delay information.Described integer time delay information and described mark time delay information via adder are merged into time delay information.
Described pulse shaping filter coefficient storage module is used to store the CPG pulsed filter coefficient of many groups through the mark time delay processing.Wherein, CPG pulsed filter coefficient is several groups of pre-designed parameters, and each group parameter designing is all corresponding with specific mark time delay information.As shown in Figure 5.
Described peak pulse scheduler module, mark time delay information according to the output of peak value time delay estimation module, read and be stored in the pulse shaping filter coefficient storage shown in Figure 5 through mark time delay processing CPG pulsed filter coefficient, a plurality of peak values in the peak value offset pulse shaping filter progression length are controlled and distributed, treatable maximum peak value numbers equal the CPG number in a filter length, and remaining peak value will not handled.
Described CPG module produces and the corresponding cancellation pulses of peak.Described peak pulse scheduler module reads CPG pulsed filter coefficient c (n), is input to the CPG module, with the cancellation pulses I that obtains through the CORDIC inverse transformation
PulseAnd Q
PulseMultiply each other, produce and the corresponding peak value offset pulse of peak:
p
CPG(n)=c (n) * (I
Pulse+ j*Q
Pulse) (formula 7)
The original peak clipping signal for the treatment of subtracts each other with the peak value offset pulse through the time delay resume module, realizes peak clipping.
When the device of the broadband reduction signal peak-to-average ratio of utilizing the embodiment of the invention to provide carried out the peak clipping processing, general process was as described below:
High peak-to-average force ratio treat that the peak clipping signal is through the conversion of CORDIC conversion module after, obtain the amplitude and the phase information of signal, detect for the first time peak signal information by described peak detection block according to the output of peak value detection threshold afterwards, the signal that detects for the first time in the peak value window scope of peak value place is interpolated into speed F1 through described interpolating module by sampling rate F0, send into described peak value again search module carry out second time peak value and detect, detected peak information and peak clipping for the second time handled thresholding and subtracted each other the signal that extracts cancellation pulses through the CORDIC inverse transform block, described peak pulse scheduler module extracts CPG pulsed filter coefficient according to the time delay information of peak value time delay estimation module output from described pulse shaping filter coefficient storage, be input to the CPG module and produce the peak value offset pulse with the cancellation pulses that obtains through the CORDIC inverse transformation.The peak clipping signal for the treatment of of high peak-to-average force ratio subtracts each other processing through time delay module and peak value offset pulse, signal after the output peak clipping.
Shown in Figure 6, be the method that a kind of broadband that the embodiment of the invention provides reduces signal peak-to-average ratio, said method comprising the steps of:
To obtain to treat the amplitude and the detection threshold thr of peak clipping signal through the CORDIC iterative algorithm
DetectCompare, determine greater than detection threshold thr
DetectPeak.The detection of described peak can be adopted four point search methods, successively four adjacent points of each group is carried out peak and judges that relatively four point search methods search the amplitude and the detection threshold thr of peak value
Detect, if search the amplitude of peak value greater than detection threshold thr
Detect, then output detects the amplitude and the phase information of peak value for the first time.
Wherein, the CORDIC iterative algorithm, and four point search methods are introduced no longer repetition here in front to some extent.
The signal that detects in the peak value window scope of peak value place is carried out interpolation processing, detects peak value x (n) in the peak value window scope of peak value place for the first time, adopt following formula to carry out multiphase filtering and handle,
Wherein, N
FIBe low pass filter length, h
FIBe low pass filter device coefficient, n represents n sampled signal, and m represents m coefficient of filter.
A plurality of peak values in the signal y (n) after the interpolation are compared, keep a wherein maximum peak amplitude Mag
MaxWith phase place Phase
MaxWith peak amplitude Mag
MaxHandle thresholding thr with peak clipping
ProcessCompare, obtain the amplitude Mag of error signal
ErrorWith phase place Phase
MaxInformation.
Mag
Error=Mag
Max-thr
Process(formula 6)
Wherein, by cordic algorithm peak value is searched for again and to be obtained peak value and peak clipping and handle the error signal that thresholding subtracts each other and carry out the CORDIC inverse transformation, finish signal by the conversion of polar coordinates, generation cancellation pulses information to plane coordinates.
Step 51, estimation peak value time delay comprise mark time delay and integer time delay part, relatively search the variations in peak situation before and after the interpolation, obtain mark time delay information, estimate the required time delay of peak detection process, obtain integer time delay information.
Step 52, select to support the CPG pulsed filter coefficient that disappears.According to different mark time delay information, read corresponding CPG pulsed filter coefficient.
Step 53, a plurality of peak values that search in the cancellation pulses forming filter progression length are distributed and handle.
Step 54, multiply each other, produce the peak value offset pulse according to the CPG pulsed filter coefficient and the cancellation pulses that obtain.
Described broadband reduces the method for signal peak-to-average ratio, further comprises, and treats the peak clipping signal and carries out multistage peak clipping iterative processing.
Fig. 7 is that a kind of broadband reduces the method for signal peak-to-average ratio at F of TD-SCDMA system and A two-band specific embodiment.In this specific embodiment, the peak value timing distribution figure before and after the broadband signal interpolation is as shown in Figure 4 produced by F and A two-band signal.
The present invention can satisfying the leakage of Error Vector Magnitude and adjacent-channel power than under the condition, suitably use multi-stage iteration peak clipping processing method to realize according to the hardware resource in the practical communication system design, obtains lower peak-to-average force ratio performance.Scheme provided by the invention, its Digital Signal Processing adopts the sequential processes mode, does not relate to any feedback processing modules, thereby easily realizes in the actual hardware system.
Here the present invention is described in detail by specific embodiment, provide the description of the foregoing description to make or be suitable for the present invention in order to make those skilled in the art, the various modifications of these embodiment are to understand easily for a person skilled in the art.The invention is not restricted to only handle F of TD-SCDMA system and A two-band configuring condition, for other frequency range configuring condition, it is suitable that its peak clipping effect and traditional peak pulse are offset the peak clipping technology.The present invention is applicable to GSM, TD-SCDMA, UMTS, CDMA, LTE, Wimax system and mutual various mixed modular system, includes but not limited to broadcasting and satellite communication system.The present invention is not limited to these examples, or some aspect wherein.Scope of the present invention is elaborated by additional claim.
Above-mentioned explanation illustrates and has described a preferred embodiment of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard eliminating as to other embodiment, and can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein, change by the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of claims of the present invention.
Claims (12)
1. device that reduces signal peak-to-average ratio, it is characterized in that described device comprises: peak detection block, interpolating module, peak value be search module, peak value time delay estimation module, peak pulse scheduler module, time delay module and cancellation pulses generator (CPG) module again; Wherein,
Treat the peak clipping signal through described peak detection block,, send into described interpolating module according to the peak value detection threshold output detection peak information first time;
Described interpolating module detection peak information for the first time is interpolated into second sampling rate by first sampling rate, sends into described peak value search module again;
Described peak value search module again carries out the peak value detection second time, and peak information and the peak clipping processing thresholding that detects for the second time subtracted each other the extraction cancellation pulses;
Described peak value time delay estimation module relatively searches the variations in peak situation before and after the interpolation, obtains time delay information;
Described peak pulse scheduler module is input to the CPG module according to described time delay information extraction CPG filter coefficient;
Described CPG module multiplies each other CPG filter coefficient and cancellation pulses and produces the peak value offset pulse, and described peak value offset pulse is handled by described time delay module with treating the peak clipping signal, signal after the output peak clipping.
2. device as claimed in claim 1, it is characterized in that, described device also further comprises CORDIC (CORDIC) conversion module, described CORDIC conversion module is treated the peak clipping signal and is carried out the CORDIC conversion, obtain the amplitude and the phase information of signal, send into described peak detection block.
3. device as claimed in claim 1, it is characterized in that, described device also further comprises the CORDIC inverse transform block, and described CORDIC inverse transform block is searched for peak value again and obtained the error signal that peak value and peak clipping handle after thresholding subtracts each other and carry out the CORDIC inverse transformation, generates the cancellation pulses signal.
4. device as claimed in claim 1, it is characterized in that, described peak value time delay estimation module comprises mark time delay estimation unit and integer time delay estimation unit, wherein, the interpolation multiple information that the utilization of described mark time delay estimation unit sets in advance, and, obtain mark time delay information from described peak detection block and the peak value peak information of search module output again, finish the mark time delay alignment of peak value before and after the interpolation; The interpolation multiple information that the utilization of described integer time delay estimation unit sets in advance, and from described peak detection block and the peak value peak information of search module output again, obtain integer time delay information, described integer time delay information and described mark time delay information via adder are merged into time delay information.
5. device as claimed in claim 4, it is characterized in that, described device also further comprises pulse shaping filter coefficient storage module, be used to store the CPG pulsed filter coefficient of many groups through the mark time delay processing, described peak pulse scheduler module extracts the CPG filter coefficient according to the time delay information of described peak value time delay estimation module output from pulse shaping filter coefficient storage module.
6. a method that reduces signal peak-to-average ratio is characterized in that, described method comprises:
The amplitude and the phase place of peak clipping signal treated in step 1, acquisition, and the detection peak position;
Step 2, the signal in the peak value window scope of detected peak place is carried out interpolation processing;
Step 3, signal after the interpolation is carried out peak value search for again, obtain further peak;
Step 4, peak value is searched for the amplitude of definite peak and peak clipping again handle thresholding and subtract each other the cancellation pulses information that comprises amplitude and phase place that extracts;
Step 5, extract cancellation pulses generator (CPG) filter factor, with CPG filter coefficient and the cancellation pulses generation peak value offset pulse signal that multiplies each other;
Step 6, obtain the peak clipping signal with the peak value offset pulse and through the peak clipping signal subtraction for the treatment of after postponing to align.
7. method as claimed in claim 6 is characterized in that, in the step 1, adopts CORDIC (CORDIC) iterative algorithm to receive amplitude and the phase information for the treatment of the peak clipping signal.
8. method as claimed in claim 7 is characterized in that, in the step 1, obtains to treat the amplitude and the detection threshold thr of peak clipping signal through the CORDIC iterative algorithm
DetectCompare, determine greater than detection threshold thr
DetectPeak.
9. method as claimed in claim 6 is characterized in that, in the step 3, a plurality of peak values in the signal after the interpolation is compared, and keeps a wherein maximum peak amplitude Mag
MaxWith phase place Phase
Max
10. method as claimed in claim 9 is characterized in that, in the step 4, peak value searched for again obtains peak value and peak clipping and handles the error signal that thresholding subtracts each other and carry out the CORDIC inverse transformation, generates cancellation pulses.
11. method as claimed in claim 10 is characterized in that, described step 5 further comprises:
Step 51, estimation peak value time delay comprise mark time delay and integer time delay part, relatively search the variations in peak situation before and after the interpolation, obtain mark time delay information, estimate the required time delay of peak detection process, obtain integer time delay information;
Step 52, selection cancellation pulses filter coefficient according to different mark time delay information, read corresponding CPG pulsed filter coefficient;
Step 53, a plurality of peak values that search in the cancellation pulses forming filter progression length are distributed and handle;
Step 54, multiply each other, produce the peak value offset pulse according to the CPG pulsed filter coefficient and the cancellation pulses that obtain.
12. the method for claim 1 is characterized in that, described method further comprises, and treats the peak clipping signal and carries out multistage peak clipping iterative processing.
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