CN101316251A - Method and system for despicking of wideband signal - Google Patents
Method and system for despicking of wideband signal Download PDFInfo
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- CN101316251A CN101316251A CNA2008100295407A CN200810029540A CN101316251A CN 101316251 A CN101316251 A CN 101316251A CN A2008100295407 A CNA2008100295407 A CN A2008100295407A CN 200810029540 A CN200810029540 A CN 200810029540A CN 101316251 A CN101316251 A CN 101316251A
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Abstract
The invention provides a method and a system for carrying out peak clipping to wideband signals, the system includes an error signal generation module, a filtering module, a time-delay module and a superposition module, and the method includes the following steps: the error signal generation module generates an error signal e(n) according to the difference value of the peak envelope of an input signal x (n) and a preset peak-clipping threshold A0; the filtering module receives the error signal and filters the error signal by using an FIR filter to obtain a cancellation signal c(n); the time-delay module calculates the total delay of the error signal generation module and the filtering module, and delays the input signal to output a time-delay signal, the delay value of the time-delay signal is equal to the total delay; the superposition module superposes the cancellation signal and the time-delay signal for peak clipping. The method and the system of the invention utilize the FIR filter to filter the error signal so as to generate the cancellation signal, and completes the peak clipping of the signals by superposition, thus being easy to be realized, consuming less hardware resource and avoiding the spread of the frequency domain and the regeneration of the peak value.
Description
Technical field
The present invention relates to Signal Processing, particularly, relate to the method and system that broadband signal is carried out peak clipping.
Background technology
At present, 3G signal and above signal thereof, for example CDMA2000 signal, WCDMA signal, TD-SCDMA signal and other broadband signals such as WIMAX signal all exist the too high problem of peak-to-average force ratio (PAR) usually.At the radio-frequency transmissions end, the signal of high peak-to-average force ratio is very high to the dynamic duty area requirement of power amplifier.In order to satisfy linear requirement, need carry out back-off to power amplifier, make the average power of input signal add the 1dB compression point of peak-to-average force ratio less than power amplifier; And, require to improve the average power of input signal again, thereby improve the efficient of power amplifier in order to raise the efficiency as far as possible.This shows to have only by reducing the PAR value of signal, could be in the efficient that guarantees to improve under the linear prerequisite power amplifier.The method that reduces signal PAR is referred to as the peak clipping technology, abbreviates CFR as.
Along with the development of technology, CFR can be divided into three major types such as amplitude limit class, coding class, probability class.Amplitude limit class CFR mainly is the peak-peak of restricting signal, and amplitude limit class CFR mainly comprises hard peak clipping method, window function filtering peak clipping method and offsets pulse peak clipping method etc.
The cardinal principle of window function filtering peak clipping method is as shown in Figure 1: receiving inputted signal x (n), wherein n represents the signal sampling point, produce the envelope error b (n) of each peak envelope that exceeds default peak clipping threshold value then, envelope error b (n) represents the amplitude difference of this peak envelope and default peak clipping threshold value, then utilize window function that envelope error b (n) is carried out filtering, calculate one group of amplitude fading factor r (n); Simultaneously, described input signal x (n) is delayed time, obtain delay time signal, the delay value of delay time signal equals to produce above-mentioned envelope error b (n) and produces the overall delay that above-mentioned amplitude fading factor r (n) causes.Then, amplitude fading factor r (n) is multiplied each other with peak envelope through time-delay, thereby reduced the peak amplitude of each peak envelope, finished the peak clipping of signal and handled.Because window function filtering peak clipping method is a process that multiplies each other on time domain, therefore, is the process of a convolution on frequency domain, will cause signal spread spectrum to occur, causes the deterioration of side channel power ratio (ACPR); On the other hand, existing window function filtering peak clipping method also the peak value orthogenesis can occur, and the peak clipping effect is undesirable.
Summary of the invention
One object of the present invention is to provide a kind of method that broadband signal is carried out peak clipping, and this method can be avoided spread spectrum and peak value regeneration.
The method that broadband signal is carried out peak clipping provided by the invention may further comprise the steps: according to peak envelope and the default peak clipping threshold value A of input signal x (n)
0Difference produce error signal e (n); Use finite impulse response filter that described error signal e (n) is carried out filtering, obtain offseting signal c (n); Calculate and produce described error signal e (n) and carry out the overall delay that described filtering causes; Described input signal x (n) is delayed time to obtain delay time signal, and the delay value of described delay time signal equals described overall delay; Superpose described signal c (n) and the described delay time signal of offseting to carry out peak clipping.
Preferably, the producing method of described error signal e (n) is: if the mould value of described input signal x (n) | x (n) | and≤described peak clipping threshold value A
0, then described error signal e (n) is 0; If the mould value of described input signal | x (n) |＞described peak clipping threshold value A
0, then described error signal e (n) is
In this preferred version, be equivalent to from exceeding default peak clipping threshold value A
0Peak envelope in intercept out error signal e (n), make to offset signal c (n) and can offset peak envelope fully based on what this error signal e (n) produced, avoided peak value regeneration.In addition because error signal e (n), offset signal c (n) and original input signal peak envelope in shape similitude, avoided the incomplete phenomenon of peak clipping effectively.
Preferably, the impulse response h (n) of described finite impulse response filter is symmetrical.This filter can produce the needed signal c (n) that offsets better, guarantees to offset signal c (n) and farthest keeps the shape of error signal, thereby reach best peak clipping effect.
Preferably, the described signal c (n) that offsets is the convolution of described error signal e (n) with described impulse response h (n).
Preferably, the frequency spectrum of described finite impulse response filter is identical with the frequency spectrum of described input signal x (n).In this preferred version, because the frequency spectrum of finite impulse response filter is identical with the frequency spectrum of input signal, make that the frequency spectrum that offsets signal c (n) is consistent with original input signal x (n) frequency spectrum, thereby the frequency spectrum of the frequency spectrum of the signal that the peak clipping of feasible process is handled and original input signal x (n) is consistent, and helps the side channel power ratio (ACPR) of control signal.
Another object of the present invention provides a kind of system that broadband signal is carried out peak clipping, and the hardware resource that this system consumes is few and can avoid frequency domain expansion and peak value regeneration.
The system that broadband signal is carried out peak clipping provided by the invention comprises error signal generation module, filtration module, time delay module and laminating module, and wherein: described error signal generation module is used for according to the peak envelope of input signal x (n) and default peak clipping threshold value A
0Difference produce error signal e (n); Described filtration module comprises finite impulse response filter, is connected with described error signal generation module, receives described error signal e (n), and described finite impulse response filter is used for that described error signal e (n) is carried out filtering and offsets signal c (n) with output; Described time delay module calculates the overall delay of described error signal generation module and described filtration module, and described input signal x (n) is delayed time with the output delay time signal, and the delay value of described delay time signal equals described overall delay; Described laminating module is connected with described filtration module, time delay module, and described signal c (n) and the described delay time signal of offseting that superpose is to carry out peak clipping, output signal output.
Preferably: if the mould value of described input signal x (n) | x (n) |≤described peak clipping threshold value A
0, the error signal e (n) that then described error signal generation module produces is 0; If the mould value of described input signal | x (n) |＞described peak clipping threshold value A
0, the error signal e (n) that then described error signal generation module produces is
Preferably, the impulse response h (n) of described finite impulse response filter is symmetrical.
Preferably, the described signal c (n) that offsets is the convolution of described error signal e (n) with described impulse response h (n).
Preferably, the frequency spectrum of described finite impulse response filter is identical with the frequency spectrum of described input signal x (n).
Compare with existing window function filtering peak clipping method, the present invention at first produces the error signal of peak envelope, then use finite impulse response filter that error signal is carried out filtering and offset signal with generation, stack offsets signal and the amplitude that offsets described peak envelope through the input signal of delaying time then, avoid the phase multiplication on the time domain, avoided the regeneration of frequency domain expansion and peak value effectively.
Description of drawings
Fig. 1 is existing window function filtering peak clipping ratio juris figure;
Fig. 2 is the existing pulse peak clipping ratio juris figure that offsets;
Fig. 3 is the schematic diagram of despicking method of the present invention;
Fig. 4 is the flow chart of despicking method shown in Figure 3;
Fig. 5 is the spectrogram of common several carrier signals;
Fig. 6 is that incomplete schematic diagram appears offseting in the existing pulse peak clipping method that offsets;
Fig. 7 is peak clipping method of the present invention is carried out peak clipping to an input signal shown in Figure 6 schematic diagram;
Fig. 8 is the existing schematic diagram that excessive peak clipping appears in pulse peak clipping method that offsets;
Fig. 9 is peak clipping method of the present invention is carried out peak clipping to an input signal shown in Figure 8 schematic diagram;
Figure 10 is a kind of schematic diagram of impulse response of FIR filter;
Figure 11 is the schematic diagram of peak clipping of the present invention system.
Embodiment
Baseband signal generally comprises pulse-shaping filtering, peak clipping processing (CFR), digital pre-distortion steps such as (DPD) in the transfer process of radiofrequency signal.Despicking method of the present invention is applicable to after the filtering of baseband signal pulse-shaping, before the digital pre-distortion.
Some step of despicking method of the present invention is identical with the existing part steps that offsets pulse peak clipping method, therefore, before introducing despicking method of the present invention, introduces the existing pulse peak clipping method that offsets earlier.The existing main process that offsets pulse peak clipping method is as shown in Figure 2: receiving inputted signal x (n), determine to exceed among the input signal x (n) amplitude and the position of peak point of each peak envelope of default peak clipping threshold value, according to the amplitude and a plurality of pulse p that offset of position generation of the peak point of this each peak envelope
1(n)～p
m(n), then, these a plurality of pulse p that offset add up
1(n)～p
m(n), obtain offseting signal c (n); On the other hand, input signal x (n) is delayed time, produce delay time signal, amplitude and position, generation that the delay value of delay time signal equals above-mentioned detection peak envelope offset pulse p
1(n)～p
m(n) and produce and to offset the overall delay that signal c (n) is caused.Then, stack offsets signal c (n) and delay time signal, by offseting the amplitude that signal c (n) cuts down each peak envelope of process time-delay, realizes that the peak clipping of signal is handled.
As seen, since existing offset that pulse peak clipping method need add up each peak envelope offset pulse p
l(n)～p
m(n) produce and offset signal, the implementation procedure complexity need take a lot of hardware resources.
And despicking method cardinal principle of the present invention as shown in Figure 3: according to peak envelope and the default peak clipping threshold value A of input signal x (n)
0Difference produce error signal e (n); Then use finite impulse response filter that error signal e (n) is carried out filtering, obtain offseting signal c (n); Then, calculate generation described error signal e (n) and carry out the overall delay that described filtering causes, and described input signal x (n) is delayed time to obtain delay time signal, the delay value of described delay time signal equals described overall delay; At last, described signal c (n) and the described delay time signal of offseting of stack is to carry out peak clipping.
As seen, compare with the existing pulse peak clipping method that offsets, the filtering of despicking method of the present invention by finite impulse response filter produces and offsets signal, the pulse that offsets of each peak envelope that do not need to add up, and implementation procedure is simple, and the hardware resource that takies is few.
Fig. 4 is the flow chart of despicking method of the present invention.With reference to figure 3 and Fig. 4, at step S300 receiving inputted signal x (n) afterwards, in step S301, determine to exceed among the input signal x (n) default peak clipping threshold value A
0The crest envelope, according to peak envelope and default peak clipping threshold value A
0Difference produce error signal e (n), wherein, n represents the position of sampled signal.
In one embodiment, the producing method of error signal e (n) is:
Wherein, A
0The default peak clipping threshold value of representative, | x (n) | the mould value of representation signal x (n).
If input signal x (n) is a vector format, for example use vector format complex representation, that comprise in-phase component (I) and quadrature component (Q), so, the error signal e (n) that produces according to equation 1 will be a vector format; Correspondingly, if input signal x (n) is the scalar form, then the error signal e (n) that produces according to equation 1 will be the scalar form.
Produce error signal e (n) according to equation 1, be equivalent to exceeding default peak clipping threshold value A
0Peak envelope all intercepting come out to produce error signal, error signal offsets signal through producing behind the FIR filter filtering again, this shows, offsets the peak envelope of signal and the peak envelope of primary signal and has similitude in shape.Therefore, implement to produce error signal e (n) according to above-mentioned equation 1 when of the present invention, can avoid the incomplete phenomenon of peak clipping.
After the step S301, in step S302, use finite impulse response (FIR) (FIR) filter that described error signal e (n) is carried out filtering, obtain offseting signal c (n).In one embodiment, offset signal c (n) and be the convolution of error signal e (n) with the impulse response h (n) of FIR filter.
In this step, produce and to offset signal c (n), do not need as the existing a plurality of pulse p that offset that add up the pulse peak clipping method that offset by error signal e (n) being carried out filtering
1(n)～p
m(n) produce and offset signal, reduced the complexity of signal processing, saved hardware resource.
In step S303, the overall delay N that is produced among calculation procedure S301, the step S302, and described input signal x (n) delayed time, delay value equals described overall delay N, obtains delay time signal x (n-N).Overall delay N depends on that concrete hardware is realized and the characteristic of filter.Particularly, the time delay of step S301 is to produce the spent time delay of error signal, and the time delay of step S302 is the time delay that the FIR filter is caused.In the digital circuit field, the time-delay calculation method of multiple mature and feasible is arranged in the industry.
Then, among the step S304, described signal c (n) and the delay time signal x (n-N) of offseting that superpose produces at the peak envelope that exceeds default peak clipping threshold value in the original input signal owing to offset signal c (n), therefore, additive process is exactly in fact the process that offsets, so the amplitude by this peak envelope has just been cut down in stack has realized the peak clipping processing, obtain output signal y (n), i.e. y (n)=x (n-N)-c (n) through peak clipping.Because the present invention finishes peak clipping by stack to handle, do not need as existing window function filtering peak clipping method, on time domain, to carry out multiplying, so avoided frequency domain expansion and peak value regeneration effectively.
Above the main process of despicking method of the present invention is set forth, despicking method of the present invention implements comparatively simple, and the hardware resource of consumption is few, and peak clipping is satisfactory for result.Implement the present invention, generally carry out peak clipping processing and can reach the peak clipping purpose.In the peak value difference of peak clipping desired value and primary signal under the situation of big (more than 2.5dB), generally only need to repeat twice and just reach the peak clipping target.Repeat twice if desired, can adopt the mode of two-stage cascade, that is, at first input signal is carried out the one-level peak clipping and handle, the input signal of the signal of back generation as secondary peak clipping processing handled in the one-level peak clipping.
As mentioned above, because the signal c (n) that offsets of the present invention is based on that error signal e (n) produces, and error signal e (n) is greater than default peak clipping threshold value A at the mould value
0Peak envelope produce, irrelevant with the carrier mode of input signal, therefore, the present invention is applicable to the input signal of various carrier modes.
Fig. 5 is the spectrogram of common four kinds of carrier signals, wherein, and signal (a) and (b) be respectively typical single-carrier signal, multi-carrier signal continuously, and signal (c) and signal (d) they are discontinuous multi-carrier signal.In the present invention, signal (c) and signal (d) are referred to as the multi-carrier signal of " under load wave mode ".
For single-carrier signal and continuous multi-carrier signal, incomplete phenomenon appears offseting in the existing pulse peak clipping method that offsets easily; Multi-carrier signal for " under load wave mode ", the existing pulse peak clipping method phenomenon of the excessive peak clipping of appearance easily that offsets, but implement to produce error signal e (n) according to above-mentioned equation 1 when of the present invention, can avoid offseting the phenomenon of incomplete and excessive peak clipping effectively.Set forth below in conjunction with Fig. 6 to Fig. 9.
Fig. 6 is that incomplete schematic diagram appears offseting in the existing pulse peak clipping method that offsets.As shown in Figure 6, comprised among Fig. 6 input signal 6 before the peak clipping, offset the signal 7 and the time domain schematic diagram of peak clipping signal 8.When implementing, the existing pulse peak clipping method that offsets is at first found out and is exceeded the peak clipping threshold value A in the input signal 6
0The peak point of peak envelope, for example peak point 601,602,603 and 604, produce according to the position of peak point and amplitude then and offset pulse accordingly, then each is offseted impulse summation and produce and offset signal 7, input signal 6 deducts and offsets signal 7 and can obtain peak clipping signal 8.If the peak envelope broad of primary signal (for example peak envelope at peak point 604 places), and it is narrower to offset the peak envelope of signal 7, the amplitude of the signal of peak clipping 8 that will cause peak point 604 places is still greater than the peak clipping threshold value A
0Thereby, cause peak clipping incomplete, fail to reach the purpose of peak clipping.Those skilled in the art should recognize, existingly offset pulse peak clipping method processing single-carrier (with reference to signal (a) shown in Figure 5), continuously during multi-carrier signal (with reference to signal (b) shown in Figure 5), incomplete phenomenon occurs offseting easilier.Fig. 7 is a schematic diagram of using the above-mentioned signal 6 of processing of the present invention.As shown in Figure 7, when implementing, according to above-mentioned equation 1 in the input signal 6 greater than the peak clipping threshold value A
0Peak envelope all intercepting come out to produce error signal e (n), error signal e (n) offsets signal 7 through producing behind the FIR filter filtering again, this shows, offsets the peak envelope of signal 7 and the peak envelope of input signal 6 and has similitude in shape.Therefore, the above-mentioned equation 1 of peak clipping algorithm application of the present invention produces error signal and can avoid the incomplete phenomenon of peak clipping.
Fig. 8 is the existing schematic diagram that excessive peak clipping appears in pulse peak clipping method that offsets.As shown in Figure 8, comprised among Fig. 8 input signal 6 before the peak clipping, offset the signal 7 and the time domain schematic diagram of peak clipping signal 8.When implementing, existing pulse offsets the peak clipping method will be at exceeding default peak clipping threshold value A
0Each peak envelope produce one and offset pulse, and the amplitude that offsets pulse is proportional to corresponding peaks point (for example peak point 601-605) and default peak clipping threshold value A
0Difference, in this case, if the peak point of the several peak envelopes that lean on closerly (for example peak envelope at peak point 601-603 place) is all higher, so, adding up, each offsets pulse and offsets after the signal 7 with generation, will cause the peak envelope that offset signal 7 corresponding with these several peak envelopes far above desired value, thus cause peak point 601-603 after peak clipping far below default peak clipping threshold value, that is to say, the phenomenon of " excessively peak clipping " occurred.Excessively the direct result of peak clipping is exactly to have increased the distortion level of peak clipping signal (EVM).Those skilled in the art should recognize, and are existing when offseting pulse peak clipping method and handling the multi-carrier signal of under load wave mode (with reference to signal (c) shown in Figure 5 and (d)), the phenomenon of the excessive peak clipping of easier appearance.Fig. 9 is a schematic diagram of using the above-mentioned signal 6 of processing of the present invention.As shown in Figure 9, when implementing, produce error signal e (n) according to equation 1, again error signal e (n) is carried out filtering and offset signal 7 with generation, the amplitude that offsets the peak envelope of signal 7 depends on the peak envelope and the default peak clipping threshold value A of input signal 6
0Between difference, therefore can avoid occurring the phenomenon of excessive peak clipping.
As another preferred version, for the ACPR of control signal effectively, the noise control that peak clipping need be produced is in the passband of signal, that is, the frequency spectrum of the frequency spectrum of peak clipping signal and input signal will be consistent.So, need guarantee that the spectral characteristic of FIR filter is identical with the frequency spectrum of input signal.In addition, for distorted signals degree (EVM) minimum that guarantees to be caused by peak clipping, the impulse response h (n) of selected FIR filter should be symmetrical, as shown in figure 10.
The FIR filter can design according to characteristics, the carrier mode of input signal.For the signal of single carrier mode, FIR Filter Design parameter mainly comprises cut-off frequency, window function type, filter order.Cut-off frequency can be according to the bandwidth calculation of single-carrier signal, the preferred hamming window of window function type, and filter order can be selected according to the performance requirement of reality.Determined after the parameters such as cut-off frequency, window function type, filter order, can adopt filter-design software commonly used in the industry to finish Filter Design, available filter-design software has the Matlab software of MathWorks company, the ScopeFIR software of Lowegian company etc.
For the signal of multi-carrier mode, can be at the impulse response h of single carrier mode
s(n) the impulse response h of design multi-carrier filter on the basis
m(n):
Wherein, n is the sequence number of filter impulse response, and i is the carrier wave sequence number, and M is the carrier wave number, f
iBe the frequency offset of i carrier wave relative signal center frequency point, F
sBe the signals sampling frequency, N is the exponent number of filter;
Represent round numbers.According to equation 2 as can be known, the impulse response h that is actually in single carrier mode
s(n) use the impulse response h of Digital Up Convert (DUC) art designs multi-carrier filter on the basis
m(n).
Figure 11 is the schematic diagram of peak clipping of the present invention system.As shown in figure 11, peak clipping of the present invention system comprises error signal generation module 1101, filtration module 1102, time delay module 1103 and laminating module 1104.
Error signal generation module 1101 is used for according to input signal x (n) and default peak clipping threshold value A
0Error, produce error signal e (n).Filtration module 1102 is connected with error signal generation module 1101, receives error signal e (n), uses the FIR filter that error signal e (n) is carried out filtering, and output offsets signal c (n).The overall delay N of time delay module 1103 error signal generation modules 1101 and filtration module 1102, and input signal delayed time, output delay time signal x (n-N), the delay value of delay time signal x (n-N) equals overall delay N.Laminating module 1104 is connected with filtration module 1102, time delay module 1103, and stack offsets signal and delay time signal to carry out peak clipping, output signal output y (n), i.e. y (n)=x (n-N)-c (n).
In one embodiment, if the mould value of input signal | x (n) |≤peak clipping threshold value A
0, then the error signal e (n) of error signal generation module 1101 generations is 0; If the mould value of input signal | x (n) |＞peak clipping threshold value A
0, then the error signal e (n) of error signal generation module 1101 generations is
As mentioned above, the impulse response h (n) of FIR filter preferred about symmetry fully.For single-carrier signal, design the FIR filter according to cut-off frequency, window function type, filter order; For multi-carrier signal, at the impulse response h of single carrier mode
s(n) use the impulse response h of Digital Up Convert (DUC) art designs multi-carrier filter on the basis
m(n):
Wherein, n is the sequence number of filter impulse response, and i is the carrier wave sequence number, and M is the carrier wave number, f
iBe the frequency offset of i carrier wave relative signal center frequency point, F
sBe the signals sampling frequency, N is the exponent number of filter;
Represent round numbers.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1, a kind of method that broadband signal is carried out peak clipping is characterized in that, may further comprise the steps:
Peak envelope and default peak clipping threshold value A according to input signal x (n)
0Difference produce error signal e (n);
Use finite impulse response filter that described error signal e (n) is carried out filtering, obtain offseting signal c (n);
Calculate and produce described error signal e (n) and carry out the overall delay that described filtering causes;
Described input signal x (n) is delayed time to obtain delay time signal, and the delay value of described delay time signal equals described overall delay;
Superpose described signal c (n) and the described delay time signal of offseting to carry out peak clipping.
2, the method that broadband signal is carried out peak clipping according to claim 1 is characterized in that, the producing method of described error signal e (n) is:
If the mould value of described input signal x (n) | x (n) |≤described peak clipping threshold value A
0, then described error signal e (n) is 0; If the mould value of described input signal | x (n) |＞described peak clipping threshold value A
0, then described error signal e (n) is
3, the method that broadband signal is carried out peak clipping according to claim 2 is characterized in that, the impulse response h (n) of described finite impulse response filter is symmetrical.
4, the method that broadband signal is carried out peak clipping according to claim 2 is characterized in that, the described signal c (n) that offsets is the convolution of described error signal e (n) with described impulse response h (n).
5, according to any described method that broadband signal is carried out peak clipping in the claim 1 to 4, it is characterized in that the frequency spectrum of described finite impulse response filter is identical with the frequency spectrum of described input signal x (n).
6, a kind of system that broadband signal is carried out peak clipping is characterized in that, comprises error signal generation module (1101), filtration module (1102), time delay module (1103) and laminating module (1104), wherein:
Described error signal generation module (1101) is used for according to the peak envelope of input signal x (n) and default peak clipping threshold value A
0Difference produce error signal e (n);
Described filtration module (1102) is connected with described error signal generation module (1101), comprises finite impulse response filter, and described finite impulse response filter is used for that described error signal e (n) is carried out filtering and offsets signal c (n) with output;
Described time delay module (1103) calculates the overall delay of described error signal generation module (1101) and described filtration module (1102), and to described input signal x (n) delay time with output delay time signal, the delay value of described delay time signal equals described overall delay;
Described laminating module (1104) is connected with described filtration module (1102), time delay module (1103), and described signal c (n) and the described delay time signal of offseting that superpose exported the signal of peak clipping to carry out peak clipping.
7, the system that broadband signal is carried out peak clipping according to claim 6 is characterized in that:
If the mould value of described input signal x (n) | x (n) |≤described peak clipping threshold value A
0, the error signal e (n) that then described error signal generation module (1101) produces is 0; If the mould value of described input signal | x (n) |＞described peak clipping threshold value A
0, the error signal e (n) that then described error signal generation module (1101) produces is
8, the system that broadband signal is carried out peak clipping according to claim 7 is characterized in that, the impulse response h (n) of described finite impulse response filter is symmetrical.
9, the system that broadband signal is carried out peak clipping according to claim 7 is characterized in that, the described signal c (n) that offsets is the convolution of described error signal e (n) with described impulse response h (n).
10, according to any described system that broadband signal is carried out peak clipping in the claim 6 to 9, it is characterized in that the frequency spectrum of described finite impulse response filter is identical with the frequency spectrum of described input signal x (n).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834822B (en) * | 2009-03-13 | 2012-10-10 | 电信科学技术研究院 | Peak value offset method and device based on peak value elimination |
| CN102299883B (en) * | 2010-06-24 | 2014-02-19 | 大唐移动通信设备有限公司 | Crest reduction method and device of broadband signal |
| CN102299883A (en) * | 2010-06-24 | 2011-12-28 | 大唐移动通信设备有限公司 | Crest reduction method and device of broadband signal |
| CN103001907A (en) * | 2011-09-15 | 2013-03-27 | 华为技术有限公司 | Digital peak clipping method and digital peak clipping device |
| CN103001907B (en) * | 2011-09-15 | 2015-08-19 | 华为技术有限公司 | A kind of digital despicking method and device |
| CN103718525B (en) * | 2013-07-12 | 2016-10-05 | 华为技术有限公司 | A kind of clipping method, Apparatus and system |
| CN103718525A (en) * | 2013-07-12 | 2014-04-09 | 华为技术有限公司 | Clipping method, device and system |
| CN104869093A (en) * | 2014-02-21 | 2015-08-26 | 普天信息技术有限公司 | Method and system for reducing signal peak-to-average ratio |
| CN104869093B (en) * | 2014-02-21 | 2018-05-15 | 普天信息技术有限公司 | A kind of method and system for reducing signal peak-to-average ratio |
| CN104980385A (en) * | 2014-04-10 | 2015-10-14 | 京信通信系统（中国）有限公司 | Signal crest factor reduction method and device |
| CN104980385B (en) * | 2014-04-10 | 2018-09-28 | 京信通信系统（中国）有限公司 | A kind of signal despicking method and equipment |
| CN111107031A (en) * | 2018-10-25 | 2020-05-05 | 北京新岸线移动多媒体技术有限公司 | Method and device for reducing signal peak-to-average ratio |
| CN111107031B (en) * | 2018-10-25 | 2022-09-20 | 北京新岸线移动多媒体技术有限公司 | Method and device for reducing signal peak-to-average ratio |
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