CN102075484B - Method and device for reducing peak-to-average power ratio of signal - Google Patents
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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 a system and method for digital signal processing in the field of mobile communications, and more particularly, to a method and apparatus for reducing the peak-to-average ratio of a signal entering a power amplifier in a communication system.
Background
The spectrum resources acquired by mobile communication operators are generally discontinuous and often dispersed in different frequency bands. The technology adopted by the operation of a plurality of frequency bands of the base station at present is an independent power amplifier and recombination way, and the defects of the technology are high cost, low efficiency and large volume. With the increasing environmental and energy pressure, operators require one base station to support multiple frequency bands for operation, and the multi-band power amplifier sharing technology has great advantages in cost, efficiency and volume, and is also the development direction of future mobile communication.
In a mobile communication system, a currently common intermediate frequency peak clipping algorithm is a peak pulse cancellation peak clipping technique. The method is based on the idea of signal superposition, generates a cancellation pulse with the same phase and the amplitude in a certain proportion to the peak value, performs frequency spectrum shaping processing on the cancellation pulse, and then performs peak value cancellation with the original signal. For example, the method of generating offset pulse by hard amplitude limiting can obtain good peak-to-average ratio performance and cause serious adjacent channel leakage, and increase the realization resources of the design of the following filter. And if a fractional interpolation filtering mode is adopted, the accuracy of peak value detection is increased, and the peak clipping performance is improved, but the consumption of hardware resources is larger under the condition of multi-band broadband configuration.
However, based on the existing peak clipping technology, the requirement of a multi-band shared power amplifier cannot be met, and particularly, under the condition that the peak clipping rate of a multi-band broadband configuration signal cannot reach four times of the signal bandwidth, the possibility that part of large peaks are missed due to too low peak clipping rate is caused, and the precision and accuracy of peak detection are reduced.
Therefore, in order to further improve the power amplification efficiency and reduce the complexity of peak clipping, it is necessary to study the multi-band peak clipping technique.
Disclosure of Invention
The invention aims to provide a method and a device for reducing a signal peak-to-average ratio in a broadband, which aim to solve the problem that the precision and the accuracy of peak detection are reduced due to low peak clipping rate in the existing peak pulse cancellation and peak clipping technology.
The invention provides a device for reducing signal peak-to-average ratio, comprising: the device comprises a peak value detection module, an interpolation module, a peak value re-searching module, a peak value time delay estimation module, a peak value pulse scheduling module, a time delay module and a Cancellation Pulse Generator (CPG) module; wherein,
the signal to be despiked passes through the peak value detection module, outputs the information of the first detected peak value signal according to the peak value detection threshold, and sends the information to the interpolation module;
the interpolation module interpolates the signal of the peak value detected for the first time from a first sampling rate to a second sampling rate, and sends the signal to the peak value re-searching module;
the peak value re-searching module carries out secondary peak value detection, and the information of the peak value detected for the second time is subtracted from the peak clipping processing threshold to extract cancellation pulse;
the peak value time delay estimation module is used for comparing the peak value position change conditions searched before and after interpolation to obtain error time delay information;
the peak pulse scheduling module extracts a CPG filter coefficient according to the time delay information output by the peak time delay estimation module and inputs the CPG filter coefficient into the CPG module;
and the CPG module multiplies the CPG filter coefficient and the cancellation pulse to generate a peak value cancellation pulse, and the peak value cancellation pulse and the signal to be subjected to peak clipping are processed by the time delay module to output a signal subjected to peak clipping.
Furthermore, the device also further comprises a coordinate rotation digital computer (CORDIC) conversion module, wherein the CORDIC conversion module carries out CORDIC conversion on the signal to be subjected to peak clipping to obtain the amplitude and phase information of the signal, and the amplitude and phase information is sent to the peak detection module.
Further, the device further comprises a CORDIC inverse transformation module, wherein the CORDIC inverse transformation module carries out CORDIC inverse transformation on an error signal obtained by subtracting the peak value obtained by searching the peak value and the peak clipping processing threshold again to generate a counteracting pulse signal.
Further, the peak time delay estimation module comprises a fractional time delay estimation unit and an integer time delay estimation unit, wherein the fractional time delay estimation unit obtains fractional time delay information by using preset interpolation multiple information and peak information output from the peak detection module and the peak re-searching module, and completes fractional time delay alignment of the peak before and after interpolation; the integer time delay estimation unit obtains integer time delay information by utilizing preset interpolation multiple information and peak value information output by the peak value detection module and the peak value re-searching module, and the integer time delay information and the fraction time delay information are combined into time delay information through an adder.
Furthermore, the device further comprises a pulse shaping filter coefficient storage module for storing a plurality of groups of CPG pulse filter coefficients subjected to fractional delay processing, and the peak pulse scheduling module extracts the CPG filter coefficients from the pulse shaping filter coefficient storage module according to the delay information output by the peak delay estimation module.
The invention also provides a method for reducing the peak-to-average ratio of a signal, which comprises the following steps:
step 1, obtaining the amplitude and phase of a signal to be peak-clipped, and detecting the position of a peak value;
step 2, carrying out interpolation processing on the detected signal in the peak value window range of the peak value position;
step 3, searching the peak value of the interpolated signal again to obtain a further peak value position;
step 4, subtracting the amplitude of the peak position determined by peak value re-searching from the peak clipping processing threshold to extract cancellation pulse information comprising the amplitude and the phase;
step 5, extracting a filter coefficient of a Cancellation Pulse Generator (CPG), and multiplying the CPG filter coefficient and a cancellation pulse to generate a peak value cancellation pulse signal;
and 6, subtracting the peak value counteracting pulse and the signal to be subjected to peak clipping after delay alignment to obtain a peak clipping signal.
Further, in step 1, amplitude and phase information of the signal to be peak-clipped is obtained by using a coordinate rotation digital computer (CORDIC) iterative algorithm.
Further, in step 1, the amplitude of the signal to be peak-clipped and the detection threshold thr are obtained through the CORDIC iterative algorithmdetectComparing to determine if it is greater than the detection threshold thrdetectThe peak position of (c).
Further, in step 3, a plurality of peaks in the interpolated signal are compared, and the largest one of the peak amplitudes Mag is retainedmaxAnd Phasemax。
Further, in step 4, the error signal obtained by subtracting the peak value obtained by searching the peak value and the peak clipping threshold is subjected to CORDIC inverse transformation to generate a cancellation pulse.
Further, the step 5 further comprises:
step 51, estimating peak time delay, including a fractional time delay part and an integer time delay part, comparing the peak position change conditions searched before and after interpolation to obtain fractional time delay information, and estimating time delay required by the peak detection process to obtain integer time delay information;
step 52, selecting a cancellation pulse filter coefficient, and reading a corresponding CPG pulse filter coefficient according to different fractional delay information;
step 53, distributing and processing a plurality of peak values searched in the order length of the cancellation pulse shaping filter;
and step 54, multiplying the obtained CPG pulse filter coefficient and the cancellation pulse to generate a peak cancellation pulse.
Further, the method further comprises the step of carrying out multi-stage peak clipping iteration processing on the signal to be subjected to peak clipping.
Compared with the traditional peak pulse offset and peak clipping technology, the peak value re-searching module for interpolation is added, under the condition that the peak clipping rate of the multi-band broadband configuration signal cannot reach four times of the signal bandwidth, the accuracy and precision of peak value detection are improved through an interpolation mode, the possibility of missing part of large peak values due to too low sampling rate and the harm of peak value regeneration after interpolation are reduced under the condition that the hardware overhead is not obviously increased, and the peak-to-average ratio performance is improved. The invention can obtain better peak clipping effect under the condition of meeting the same error vector amplitude and adjacent channel power leakage ratio index. The peak clipping processing rate is reduced through an interpolation mode, and the whole hardware resource is saved under the condition of not influencing the peak clipping performance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a basic structure of a wideband peak-to-average power ratio reduction apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific structure of a peak interpolation module;
FIG. 3 is a schematic diagram of a specific structure of a peak delay estimation module;
FIG. 4 is a graph of peak timing distribution before and after interpolation of a wideband signal;
FIG. 5 is a detailed schematic diagram of pulse shaping filter coefficient storage;
FIG. 6 is a method for wideband peak-to-average power ratio reduction according to an embodiment of the present invention; .
FIG. 7 is a specific embodiment of a method for wideband peak-to-average power ratio reduction in F and A bands of TD-SCDMA system.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of an apparatus for broadband reducing a peak-to-average ratio of a signal according to an embodiment of the present invention. As shown in fig. 1, the wideband apparatus for reducing peak-to-average power ratio of a signal includes a CORDIC (COordinate rotation digital Computer) transform module, a peak detection module, an interpolation module, a peak re-search module, an inverse CORDIC transform module, a peak delay estimation module, a pulse shaping filter storage module, a peak pulse scheduling module, a delay module, and a CPG (Cancellation pulse generator) module. Wherein:
and the CORDIC conversion module is used for carrying out CORDIC conversion on the signal to be subjected to peak clipping with high peak-to-average ratio by adopting a CORDIC iterative algorithm to complete the conversion of the signal from a plane coordinate to a polar coordinate so as to obtain the amplitude and phase information of the signal.
The CORDIC iterative algorithm is a common method for transforming polar coordinates and plane coordinates in FPGA implementation. The correlation algorithm is as follows:
setting the input combined I/Q complex signal as Ik，QkThe peak clipping threshold is Thr, and the CORDIC algorithm gain is CORDIC _ gain.
Initial value of iterative computation
{x(0)，y(0)，z(0)}＝{abs(Ik)，abs(Qk) 0} (formula 1)
An iterative calculation 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 iterations, the output x (i +1) is amplitude information, and z (i +1) is phase information.
The peak value detection module completes the function of peak value detection according to the signal after the CORDIC conversion, and carries out the amplitude and the detection threshold thr of the signal after the CORDIC conversiondetectComparing to determine if it is greater than the detection threshold thrdetectThe peak position of (c). The peak detection module adopts a four-point search method to detect, sequentially judges the peak position of each group of adjacent four points, and compares the amplitude of the peak searched by the four-point search method with a detection threshold thrdetectIf the amplitude of the searched peak value is larger than the detection threshold thrdetectThen the amplitude and phase information of the first detected peak is output.
The judgment criterion of the four-point search method is as follows: judging the amplitudes mag _ a, mag _ B, mag _ C and mag _ D of 4 points A, B, C and D which are adjacent in sequence, wherein B is the current judging point, and if the mag _ B is larger than the mag _ a and the mag _ C is not smaller than the mag _ D, B is a peak position if the mag _ B is not smaller than the mag _ C.
The interpolation module is used for carrying out interpolation processing on the signals in the peak value window range in which the peak value is detected, carrying out polyphase filtering processing by adopting the following formula after the peak value x (n) in the peak value window range in which the peak value is detected for the first time is detected,
Wherein N isFIIs the low pass filter length, hFIFor the low pass filter coefficients, n represents the nth sampled signal and m represents the mth coefficient of the filter.
Fig. 2 is a schematic diagram of a specific structure of an interpolation module. The input signal x (n) is copied into 3 paths of signals through a duplicator, and the 3 paths of signals are respectively connected with the coefficients { h } of the interpolation filter2，h5，h8}、{h1，h3，h7H and0，h3，h6convolution processing is carried out to obtain signals y (3m +1), y (3m +2) and y (3m +3) of phase0, phase1 and phase2, and the signals are converted into a signal path y (n) in a serial-parallel mode. WhereinRepresenting the integer part.
The peak value re-searching module compares a plurality of peak values in the interpolated signal y (n) and reserves the largest one of the peak valuesPeak amplitude MagmaxAnd PhasemaxAnd sending the data to a peak time delay estimation module and a CORDIC inverse transformation module for processing. Peak amplitude Mag output by peak re-searching modulemaxAnd a peak clipping processing threshold thrprocessComparing to obtain the amplitude Mag of the error signalerrorAnd PhasemaxAnd sending the information to a CORDIC inverse transformation module for processing.
Magerror＝Magmax-thrprocess(formula 6)
Some peak values of the broadband signal are lower than the peak clipping threshold thr under the low sampling rateprocessBut after upsampling, will be above the detection threshold thrdetectThe peak processing threshold thr is used to avoid missing part of the peak and regenerating the interpolated peakprocessHigher than detection threshold thrdetect。
The CORDIC inverse transformation module is used for carrying out CORDIC inverse transformation on the error signal obtained by subtracting the peak value obtained by searching the peak value and the peak clipping processing threshold again, finishing the change of the signal from polar coordinates to plane coordinates, and generating I-path and Q-path signals required by counteracting pulse as IpulseAnd Qpulse。
And the peak value time delay estimation module compares the peak value position change conditions searched before and after interpolation to obtain accurate error time delay information. Fig. 3 is a schematic diagram showing a specific structure of the peak delay estimation module. The peak time delay estimation module comprises a fractional time delay estimation unit and an integer time delay estimation unit. Wherein:
and the fractional delay estimation unit is used for completing the fractional delay alignment function of the peak values before and after interpolation. The system presets interpolation multiple information and peak information (including amplitude and phase information) output from the peak detection module and the peak re-searching module pass through the fractional delay estimation unit to obtain fractional delay information.
As can be seen from the peak timing distribution diagram before and after the interpolation of the wideband signal in fig. 4, when the peak is detected at a low rate, the processed peak may not be the maximum peak at a high sampling rate, and the cancellation pulse is not completely aligned with the maximum peak at the high sampling rate, and the peak regeneration may occur after the peak clipping process is performed on the signal. The adoption of the fractional time delay estimation unit can overcome the defect, improve the peak detection precision and reduce the peak regeneration hazard.
The integer time delay estimation unit is used for estimating the integer time delay part brought by the first peak detection and the second peak re-search, interpolation multiple information preset by the system and the peak information (including amplitude and phase information) output by the peak detection module and the peak re-search module pass through the integer time delay estimation unit to obtain the integer time delay information. And the integer time delay information and the fraction time delay information are combined into time delay information through an adder.
And the pulse shaping filter coefficient storage module is used for storing a plurality of groups of CPG pulse filter coefficients subjected to fractional delay processing. The CPG pulse filter coefficients are several groups of pre-designed parameters, and each group of parameter design corresponds to specific fractional delay information. As shown in fig. 5.
The peak value pulse scheduling module reads the CPG pulse filter coefficient subjected to fractional delay processing stored in the pulse shaping filter coefficient storage shown in FIG. 5 according to the fractional delay information output by the peak value delay estimation module, controls and distributes a plurality of peak values in the order length of the peak value counteracting pulse shaping filter, the maximum number of the peak values which can be processed in one filter length is equal to the number of the CPG, and the rest peak values are not processed.
The CPG module generates a cancellation pulse corresponding to the peak position. The peak pulse scheduling module reads the coefficient c (n) of the CPG pulse filter, inputs the coefficient c (n) into the CPG module, and obtains a cancellation pulse I through CORDIC inverse transformationpulseAnd QpulseThe multiplication, resulting in a peak cancellation pulse corresponding to the peak position:
pCPG(n)＝c(n)*(Ipulse+j*Qpulse) (formula 7)
The original signal to be despiked is processed by a time delay module and subtracted from the peak value offset pulse to realize despiking.
When the device for reducing the peak-to-average ratio of a signal in a broadband provided by the embodiment of the invention is used for peak clipping, the general process is as follows:
the method comprises the steps that a signal to be subjected to peak clipping with a high peak-to-average ratio is transformed by a CORDIC transformation module to obtain amplitude and phase information of the signal, then the peak detection module outputs first detected peak signal information according to a peak detection threshold, the signal in a peak window range where a peak value is detected for the first time is interpolated to a rate F1 through an interpolation module from a sampling rate F0, the signal is sent to a peak re-searching module to be subjected to second peak detection, the second detected peak signal is subtracted from a peak clipping processing threshold, a signal of offset pulse is extracted through an CORDIC inverse transformation module, a CPG pulse filter coefficient is extracted from a pulse shaping filter coefficient storage according to time delay information output by a peak time delay estimation module by a peak pulse scheduling module, and the CPG pulse filter coefficient is input to the CPG module and the offset pulse obtained through CORDIC transformation generates peak. And the signal to be subjected to peak clipping with high peak-to-average ratio is subjected to subtraction processing with the peak value cancellation pulse through the time delay module, and a signal after peak clipping is output.
Fig. 6 shows a method for broadband reducing a peak-to-average ratio of a signal according to an embodiment of the present invention, where the method includes the following steps:
step 1, obtaining amplitude and phase information of a signal to be subjected to peak clipping by adopting a CORDIC iterative algorithm, and detecting a peak position according to the signal amplitude information and a detection threshold.
Obtaining the amplitude of the signal to be despiked and the detection threshold thr through the CORDIC iterative algorithmdetectComparing to determine if it is greater than the detection threshold thrdetectThe peak position of (c). The peak position can be detected by adopting a four-point search method, and each group of adjacent groups are sequentially subjected to adjacent detectionThe four points are used for judging the peak value position, and the amplitude of the peak value searched by the four-point search method is compared with the detection threshold thrdetectIf the amplitude of the searched peak value is larger than the detection threshold thrdetectThen the amplitude and phase information of the first detected peak is output.
The CORDIC iterative algorithm and the four-point search method have been described above and will not be repeated here.
And 2, carrying out interpolation processing on the detected signal in the peak window range of the peak position, and improving the detection rate when the peak value is searched again.
Interpolating the signal in the peak window range in which the peak value is detected, detecting the peak value x (n) in the peak window range in which the peak value is detected for the first time, performing polyphase filtering by adopting the following formula,
Wherein N isFIIs the low pass filter length, hFIFor the low pass filter coefficients, n represents the nth sampled signal and m represents the mth coefficient of the filter.
And 3, performing peak value searching processing on the interpolated signal to obtain an accurate peak value position.
Comparing a plurality of peak values in the interpolated signal y (n), and reserving the largest one of the peak valuesAmplitude MagmaxAnd Phasemax. Will peak amplitude MagmaxAnd a peak clipping processing threshold thrprocessComparing to obtain the amplitude Mag of the error signalerrorAnd PhasemaxAnd (4) information.
Magerror＝Magmax-thrprocess(formula 6)
And 4, subtracting the amplitude of the peak position determined by peak value re-searching from the peak clipping processing threshold to extract the information of the offset pulse, wherein the information comprises the phase information of the amplitude and the peak position.
And performing CORDIC inverse transformation on the error signal obtained by subtracting the peak value obtained by searching the peak value and the peak clipping processing threshold through a CORDIC algorithm, finishing the transformation of the signal from a polar coordinate to a plane coordinate, and generating offset pulse information.
And 5, peak value time delay estimation and peak value scheduling, under the limited CPG resource, distributing and processing a plurality of peak values in the order length of the cancellation pulse shaping filter, and selecting the CPG pulse filter coefficient to generate peak value cancellation pulse.
And step 51, estimating the peak time delay, wherein the peak time delay comprises a fractional time delay part and an integer time delay part, comparing the peak position change conditions searched before and after interpolation to obtain fractional time delay information, and estimating the time delay required by the peak detection process to obtain integer time delay information.
Step 52, select the coefficients of the depulse filter to cancel the CPG. And reading the corresponding CPG pulse filter coefficient according to different fractional delay information.
Step 53, the distribution and processing of the plurality of peaks searched within the order length of the cancellation pulse shaping filter.
And step 54, multiplying the obtained CPG pulse filter coefficient and the cancellation pulse to generate a peak cancellation pulse.
And 6, subtracting the peak value counteracting pulse and the signal to be subjected to peak clipping after delay alignment to obtain a peak clipping signal.
The method for reducing the peak-to-average ratio of the signal in the broadband further comprises the step of carrying out multi-stage peak clipping iteration processing on the signal to be subjected to peak clipping.
FIG. 7 is a specific embodiment of a method for wideband peak-to-average power ratio reduction in F and A bands of TD-SCDMA system. In this particular embodiment, the peak timing profiles before and after interpolation of the wideband signal as shown in FIG. 4 are generated from the F and A dual band signals.
The invention can be realized by properly using a multi-stage iteration peak clipping processing method according to hardware resources in the design of an actual communication system under the condition of meeting the error vector magnitude and the adjacent channel power leakage ratio, and lower peak-to-average ratio performance is obtained. The scheme provided by the invention adopts a sequential processing mode for digital signal processing, and does not relate to any feedback processing module, thereby being very convenient to realize in an actual hardware system.
The present invention has been described herein in detail with respect to specific embodiments thereof, which are provided to enable those skilled in the art to make or use the invention, and various modifications thereof will be apparent to those skilled in the art. The invention is not limited to only process the F and A dual-frequency band configuration condition of the TD-SCDMA system, and the peak clipping effect is equivalent to the peak value pulse cancellation peak clipping technology of the traditional technology for other frequency band configuration conditions. The invention is suitable for GSM, TD-SCDMA, UMTS, CDMA, LTE, Wimax systems and various mixed mode systems among each other, including but not limited to broadcast and satellite communication system systems. The present invention is not limited to these examples, or to certain aspects thereof. The scope of the invention is specified by the appended claims.
While the foregoing description shows and describes a preferred embodiment of the invention, it is to be understood, as noted above, that the invention is not limited to the form disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and may be modified within the scope of the inventive concept described herein by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. An apparatus for reducing a peak-to-average ratio of a signal, the apparatus comprising: the device comprises a peak value detection module, an interpolation module, a peak value re-searching module, a peak value time delay estimation module, a peak value pulse scheduling module, a time delay module and a Cancellation Pulse Generator (CPG) module; wherein,
the signal to be despiked passes through the peak value detection module, outputs first detection peak value information according to a peak value detection threshold, and sends the first detection peak value information to the interpolation module;
the interpolation module interpolates the first detection peak information from a first sampling rate to a second sampling rate, and sends the first detection peak information to the peak re-searching module;
the peak value re-searching module carries out secondary peak value detection, and subtracts peak value information detected for the second time from a peak clipping processing threshold to extract cancellation pulse;
the peak value time delay estimation module is used for comparing the peak value position change conditions searched before and after interpolation to obtain time delay information;
the peak pulse scheduling module extracts a CPG filter coefficient according to the time delay information and inputs the CPG filter coefficient to the CPG module;
and the CPG module multiplies the CPG filter coefficient with the offset pulse to generate a peak offset pulse, the signal to be subjected to peak clipping is processed by the time delay module, subtracted from the peak offset pulse, and a signal after peak clipping is output.
2. The apparatus of claim 1, further comprising a coordinate rotation digital computer (CORDIC) transform module, wherein the CORDIC transform module performs CORDIC transform on the signal to be peak-clipped to obtain amplitude and phase information of the signal, and sends the amplitude and phase information to the peak detection module.
3. The apparatus of claim 1, further comprising an inverse CORDIC transform module, wherein the inverse CORDIC transform module performs inverse CORDIC transform on an error signal obtained by subtracting the peak value obtained by the peak re-search from the peak clipping threshold to generate the cancellation pulse signal.
4. The apparatus of claim 1, wherein the peak delay estimation module comprises a fractional delay estimation unit and an integer delay estimation unit, wherein the fractional delay estimation unit obtains fractional delay information by using preset interpolation multiple information and peak information output from the peak detection module and the peak re-search module, and completes fractional delay alignment of peaks before and after interpolation; the integer time delay estimation unit obtains integer time delay information by utilizing preset interpolation multiple information and peak value information output by the peak value detection module and the peak value re-searching module, and the integer time delay information and the fraction time delay information are combined into time delay information through an adder.
5. The apparatus of claim 4, further comprising a pulse shaping filter coefficient storage module for storing a plurality of sets of the CPG pulse filter coefficients processed by the fractional delay, wherein the peak pulse scheduling module extracts the CPG filter coefficients from the pulse shaping filter coefficient storage module according to the delay information output by the peak delay estimation module.
6. A method for reducing a peak-to-average ratio of a signal, the method comprising:
step 1, obtaining the amplitude and phase of a signal to be peak-clipped, and detecting the position of a peak value;
step 2, carrying out interpolation processing on the detected signal in the peak value window range of the peak value position;
step 3, searching the peak value of the interpolated signal again to obtain a further peak value position;
step 4, subtracting the amplitude of the peak position determined by peak value re-searching from the peak clipping processing threshold to extract cancellation pulse information comprising the amplitude and the phase;
step 5, extracting a filter coefficient of a Cancellation Pulse Generator (CPG), and multiplying the CPG filter coefficient and a cancellation pulse to generate a peak value cancellation pulse signal;
step 6, subtracting the peak value offset pulse and the signal to be subjected to peak clipping after delay alignment to obtain a peak clipping signal;
wherein, in the step 5, extracting a Cancellation Pulse Generator (CPG) filter coefficient includes:
step 51, estimating peak time delay, including a fractional time delay part and an integer time delay part, comparing the peak position change conditions searched before and after interpolation to obtain fractional time delay information, and estimating time delay required by the peak detection process to obtain integer time delay information;
and step 52, selecting the coefficient of the cancellation pulse filter, and reading the corresponding coefficient of the CPG pulse filter according to different fractional delay information.
7. The method of claim 6, wherein in step 1, amplitude and phase information of the signal to be peak-clipped is obtained using a coordinate rotation digital computer (CORDIC) iterative algorithm.
8. The method as claimed in claim 7, wherein in step 1, the amplitude of the signal to be peak-clipped and the detection threshold thr are obtained by the CORDIC iterative algorithmdetectComparing to determine if it is greater than the detection threshold thrdetectThe peak position of (c).
9. The method of claim 6 wherein in step 3, the plurality of peaks in the interpolated signal are compared, and the largest one of the peak amplitudes Mag is retainedmaxAnd Phasemax。
10. The method of claim 9 wherein in step 4, the error signal resulting from the subtraction of the peak value from the peak clipping threshold by the peak re-search is inverse CORDIC transformed to produce cancellation pulses.
11. The method of claim 10, wherein the step 5 further comprises:
step 53, distributing and processing a plurality of peak values searched in the order length of the cancellation pulse shaping filter;
and step 54, multiplying the obtained CPG pulse filter coefficient and the cancellation pulse to generate a peak cancellation pulse.
12. The method of claim 6, further comprising performing a multi-stage peak clipping iteration on the signal to be peak clipped.
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