CN101453440A - Method and apparatus for lowering multi-carrier signal PAR - Google Patents
Method and apparatus for lowering multi-carrier signal PAR Download PDFInfo
- Publication number
- CN101453440A CN101453440A CNA2007101789895A CN200710178989A CN101453440A CN 101453440 A CN101453440 A CN 101453440A CN A2007101789895 A CNA2007101789895 A CN A2007101789895A CN 200710178989 A CN200710178989 A CN 200710178989A CN 101453440 A CN101453440 A CN 101453440A
- Authority
- CN
- China
- Prior art keywords
- peak
- signal
- vector
- peak clipping
- peak point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a method and a device for reducing the peak-to-average ratio of multi-carrier signals. The method comprises the following steps: determining a despicking signal vector adjustment factor of a multi-carrier combined path signal at a peak point according to the amplitude and the phase of the multi-carrier combined path signal exceeding a set despicking threshold at the peak point and a despicking threshold at the same phase site; determining the despicking signal vector adjustment factor of each carrier signal at the peak point according to the amplitude of the despicking signal vector adjustment factor of the multi-carrier combined path signal, the amplitude at the peak point, and the amplitude and the phase of each carrier signal at the peak point; determining the despicking vector of each carrier signal at the peak point according to the despicking signal vector adjustment factor of each carrier signal and a corresponding core despicking vector; superposing the despicking vector of each carrier signal to obtain the despicking vector of the multi-carrier combined path signal at the peak point; and performing despicking processing on the multi-carrier combined path signal according to the despicking vector of the multi-carrier combined path signal at the peak point. Through the proposal, the peak-to-average ratio of the multi-carrier signals can be reduced.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly reduce the technology of signal peak-to-average ratio.
Background technology
The system that the developing goal of TD-SCDMA (Time Division-Synchronization Code Division MultipleAccess, TD SDMA) system provides higher data rate, low time delay, low cost, optimization covers and to the support of high mobility.And the quick growth of mobile communication business is in recent years promoting the evolution of system of broadband wireless communication, and the quick growth of data rate and QoS (Quality of Service, quality of service) demand is the inexorable trend of communication system development.
The TD-SCDMA system has adopted smart antenna and associated detection technique, generally, system has very high spectrum efficiency, but because the TD-SCDMA system takies the 1.6MHz bandwidth up-downgoing time-division, only be 1/6 of WCDMA (Wide-band Code Division Multiple Access, WCDMA access system) the upstream and downstream bandwidth 10MHz of system, so, although TD-SCDMA system spectrum utilance is higher, TD-SCDMA system single carrier finite capacity.And TD-SCDMA multicarrier system has solved this problem.
Along with popularizing that TD-SCDMA multicarrier system is used, the carrier number of supporting also increases thereupon, though improved the capacity and the admittance ability of the single base station of TD-SCDMA so greatly, but make PAR (the Peak to Average Ratio of signal, peak-to-average force ratio) more and more higher, the dynamic range of signal also improves thereupon, has produced following problem therefrom:
(1) Redundancy Design of the necessary taking into account system in base station causes cost to rise like this;
(2) radio-frequency (RF) power amplification is had a strong impact on, because radio-frequency (RF) power amplification has to reduce power amplification efficiency in order to guarantee quality of signals, so just waste a large amount of power, DAC (Data Acquisition Center, data acquisition center) must use the transducer of higher bit simultaneously;
(3) if PAR can fall, DPD (Digital Predistortion, digital pre-distortion) technology also can't well be used.
For fear of the problems referred to above, the PAR that how to reduce multi-carrier signal becomes the emphasis of industry research, has therefore released the algorithm of many reduction PAR.
The existing algorithm that reduces signal PAR has the method for signal being carried out the phase place rotation in physical layer, but this algorithm can only reduce the PAR of physical layer intermediate code (MIDAMBLE sign indicating number), and can not reduce the PAR of the data flow in data symbol district, so this algorithm can not can not solve the above-mentioned problem that causes owing to PAR is increasing from reducing the PAR of signal in essence.
The existing another kind of algorithm that reduces signal PAR is the pulse counteracting of carrying out multicarrier at digital intermediate frequency, eliminates high peak valve signal.This algorithm is fairly simple, and can effectively finish eliminating of peak value, but this algorithm requires the frequency spectrum coupling of the frequency spectrum and the multicarrier of peak clipping pulse, therefore and a problem that exists is when multi-carrier signal timing in discontinuous minute, peak clipping can cause signal spectrum very big distortion later, and peak value can not well be eliminated.
In addition, the threshold value of one piece of patent of China Patent No. ZL 200520119365.2 " a kind of reduction multicarrier peak-to-average force ratio device " threshold generator of giving chapter and verse is carried out hard clipping to the multi-transceiver combination signal, but the peak signal that eliminates need be carried out multistage matched filtering, generate the peak value offset signal, eliminate peak signal by this peak value offset signal.Though this device can reach the frequency spectrum coupling, is difficult to the disposable peak signal that eliminates by the peak value offset signal, and need carries out multistage convolution algorithm, so need carry out multistage matched filtering, but signal filtering and consumes resources thereof, if use multiple-stage filtering, then system is difficult to realize.
As seen, existing algorithm can cause the distortion of the signal that obtains after the peak clipping processing, and need carry out multistage matched filtering in signal timing in discontinuous minute, and system realizes difficulty, so, also there is not a kind of algorithm can reduce the PAR of signal well.
Summary of the invention
The invention provides a kind of method and device that reduces the multi-carrier signal peak equal ratio, can solve CDMA multicarrier, many antennas and multicarrier arbitrary frequency point branch plant signal PAR excessive, the carrier signal under the discontinuous distribution is carried out peak clipping handle the signal spectrum distortion that causes and need carry out the high problem of complexity that multistage matched filtering causes.
The embodiment of the invention is achieved through the following technical solutions:
The embodiment of the invention provides a kind of method that reduces the multi-carrier signal peak equal ratio, and this method comprises:
According to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding, determine the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point;
At the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector, determine the peak clipping vector of each carrier signal according to each carrier signal at this peak point; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point;
According to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping handle, obtain the multi-transceiver combination signal after this peak point is finished the peak clipping processing.
The embodiment of the invention also provides a kind of device that reduces the multi-carrier signal peak equal ratio, and this device comprises:
Peak clipping signal vector regulatory factor acquiring unit, be used for determining the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point according to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point;
Peak clipping vector generation unit is used for according to each carrier signal determining the peak clipping vector of each carrier signal at this peak point at the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point;
The peak clipping processing unit is used for according to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping handle, and obtains the multi-transceiver combination signal after this peak point is finished the peak clipping processing.
Pass through technique scheme, the embodiment of the invention passes through to surpass amplitude and the phase place of the multi-transceiver combination signal of the threshold value thresholding that is provided with at peak point, calculate the peak clipping vector of multi-transceiver combination signal at this peak point, and according to the peak clipping vector that calculates, the multi-transceiver combination signal is carried out peak clipping handle, obtain the multi-transceiver combination signal after this peak point is finished the peak clipping processing.The multi-transceiver combination signal of finishing after peak clipping is handled that obtains has reduced in the amplitude of peak point, and correspondingly its power at peak point has also reduced, thereby can effectively reduce the PAR of signal.Simultaneously, the peak clipping vector that utilizes when the technical scheme that the embodiment of the invention provides is carried out the peak clipping processing, be to obtain according to corresponding with it core peak clipping vector, the frequency spectrum of multi-carrier signal still mates after the peak clipping, so carrying out peak clipping for the carrier signal of continuous dispensing and discontinuous distribution handles, the frequency spectrum that obtains signal can distortion, and the technical scheme that the embodiment of the invention provides is only according to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping at peak point to be handled, just can finish the peak clipping processing so need not carry out multistage matched filtering, also do not have convolution algorithm accordingly, the few and system of operand is easy to realize.
Description of drawings
Fig. 1 is a kind of method flow diagram that reduces the multi-carrier signal peak equal ratio of first embodiment of the invention;
Multi-carrier signal peak clipping front and back schematic diagram in complex plane that Fig. 2 obtains for first embodiment of the invention;
Fig. 3 A is a spectrum diagram after the multi-transceiver combination signal peak clipping that obtains of first embodiment of the invention;
Fig. 3 B is a spectrum diagram after the multi-transceiver combination signal peak clipping that obtains of prior art;
Fig. 4 is a kind of device schematic diagram that reduces the multi-carrier signal peak equal ratio of second embodiment of the invention;
Fig. 5 is the position of the described device of second embodiment of the invention in system;
Fig. 6 is a kind of structure drawing of device that reduces the multi-carrier signal peak equal ratio of second embodiment of the invention;
Fig. 7 is the peak clipping signal vector regulatory factor acquiring unit structure chart of second embodiment of the invention;
Fig. 8 is the peak clipping vector generation unit structure chart of second embodiment of the invention;
Fig. 9 carries out peak clipping for the carrier signal of second embodiment of the invention and handles front and back emulation schematic diagram.
Embodiment
The PAR of signal equals the ratio of the peak power and the signal average power of signal, so will reduce the PAR of signal, the most direct method is to reduce the peak power of signal.Consider that physical channels different in the TD-SCDMA system distributes different frequency ranges, correspondingly, channel, the different frequency division multiple access access technology of use that different carrier occupancies is different.The invention provides a kind of method and device that reduces the multi-carrier signal peak equal ratio,, the signal when the peak point is carried out peak clipping handle at digital intermediate frequency.
Be explained in detail to the main realization principle of embodiment of the invention technical scheme, specific implementation process and to the beneficial effect that should be able to reach below in conjunction with Figure of description.
First embodiment of the invention provides a kind of method that reduces the multi-carrier signal peak equal ratio, and specific implementation process comprises as shown in Figure 1:
100, the signal of multi-transceiver combination signal at peak point detected, determine to carry out the multi-transceiver combination signal that peak clipping is handled.
The detailed process of step 100 is as follows:
Wherein, x
n(t) be n the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, its expression formula is:
Wherein, the data after d (t) expression is shone upon through physical channel, the index of modulation of f (t) expression low pass filter, T
cThe duration of a chip of expression, k represents the length of filter coefficient.
At first, calculate peak clipping thresholding tp (threshold_pow), this peak clipping thresholding tp handles as follows by the target_dBc decision that is provided with:
Wherein, target_dBc is the target P AR value that the user is provided with.T represents a period of time of output signal statistics.
Then, the multi-transceiver combination signal is being compared in the amplitude of peak point and the peak clipping thresholding tp of setting, is handling as follows:
At the peak point moment of multi-transceiver combination signal t, when | y (t) | during≤sqrt (tp), illustrate the multi-transceiver combination signal in the amplitude of this peak point within the peak clipping thresholding, then the multi-transceiver combination signal does not need to carry out the peak clipping processing at the signal of this peak point, also be that the multi-transceiver combination signal is finished the signal that obtains after peak value eliminates and equated with the multi-transceiver combination signal, promptly satisfy: z (t)=y (t);
At the peak point moment of multi-transceiver combination signal t, as | y (t) |〉during sqrt (tp), illustrate the multi-transceiver combination signal in the amplitude of this peak point not within the peak clipping thresholding, then the multi-transceiver combination signal carries out the peak clipping processing at the signal demand of this peak point, also be that the multi-transceiver combination signal is finished the signal that obtains after peak value eliminates and satisfied: z (t)=z (t), wherein, z (t) can obtain by subsequent step.
When practical application, utilize window function to search amplitude and the phase place of the multi-transceiver combination signal of the peak clipping thresholding that surpasses setting at peak point, and, utilize window function to search amplitude and the phase place of each carrier signal at peak point.
200, according to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding, determine the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point.
The detailed process of step 200 is as follows:
When above-mentioned steps 100 is determined | y (t) | during sqrt (tp), also be | y (t) |=0, | y (t) | when being maximum point, calculate the peak clipping signal vector regulatory factor of multi-transceiver combination signal, handle as follows at peak point:
α(t)＝y(t)-sqrt(tp)·exp(j·angle(y(t)))＝[|y(t)|-sqrt(tp)]·exp(j·θ(t)))
Wherein, θ (t)=angle (y (t)) is the phase place of multi-transceiver combination signal at peak point;
Y (t) surpasses the signal of the multi-transceiver combination signal of peak clipping thresholding tp at peak point.
Close the peak point moment t of road signal, calculating the peak clipping signal vector regulatory factor c α of n carrier signal
n(t), processing is as follows:
Wherein, θ
n(t)=angle (x
n(t)), be the phase place of n carrier signal at peak point.
Preferably, before the peak clipping signal vector regulatory factor that calculates each carrier signal, can be with the phase theta of n carrier signal at peak point
n(t) compare in the phase theta (t) of peak point with the multi-transceiver combination signal, judge θ
n(t) whether the difference with θ (t) satisfies
, if judge θ
n(t) satisfy with θ (t)
, this carrier signal then is set at the peak clipping signal vector regulatory factor c of this peak point α
n(t)=0, like this, this carrier signal just needn't be carried out peak clipping and handled, and has simplified computing, has avoided simultaneously this carrier signal is carried out the impairment of signal quality that causes when peak clipping is handled.
300, according to taproot peak clipping vector
p, calculate the core peak clipping vector of n carrier signal
h n
At first, determine taproot peak clipping vector
p
Because this taproot peak clipping vector
pFrequency domain coupling with RRC (RootRaise Cosine, root raised cosine) filter among the DUC (Digital Up Converter, Digital Up Convert) that is to say that the frequency domain response of this taproot peak clipping vector equates with the frequency domain response of RRC filter.Therefore according to the frequency domain response of RRC filter, can calculate this taproot peak clipping vector by Matlab
p
Obtain
pAfterwards, calculate the core peak clipping vector of n carrier signal by following formula
h n:
Wherein, L is a taproot peak clipping vector
pLength, f
nIt is the center frequency point of n carrier wave.
In order to reduce operand, the core peak clipping vector of each carrier wave can only calculate once, and the core peak clipping vector of each carrier wave that will calculate is kept in the system then, directly uses later on.
400, according to each carrier signal at the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector, determine the peak clipping vector of each carrier signal at this peak point; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point.
The concrete processing procedure of step 400 is as follows:
Further, consider that different carrier takies different frequencies, make
Be a plural number, unless f
n=0, but f
n=0 frequency seldom occurs, even and if the f of a carrier wave occurs also having only
n=0, other carrier wave
Remain plural number.The core peak clipping vector that causes these carrier waves like this
h nBe a plural number, thereby a problem of bringing is exactly
h nCentral point also be a plural number, have certain phase place, will destroy the phase place of peak clipping vector like this, make the peak power of the carrier signal on the different frequency well not eliminate.
In order to address the above problem, the present invention is with the core peak clipping vector of n carrier signal correspondence
h nCentral point be set to arithmetic number, concrete processing procedure is as follows:
Utilizing each carrier wave to multiply by with carrier wave separately at the core peak clipping vector of peak point promptly is provided with in corresponding value of gripping altogether of core peak clipping vector central point of peak point
, the core peak clipping vector of each carrier wave like this
h nCentral point just be an arithmetic number.
At peak point t constantly, with n carrier signal at the peak clipping signal vector regulatory factor c of this peak point α
n(t) with through the core peak clipping vector of above-mentioned processing
h nMultiply each other, obtain the peak clipping vector of n carrier signal at this peak point moment t
h n(t).
Through above-mentioned processing procedure, make the phase place of peak clipping vector central point of each carrier wave and the phase place of this carrier wave peak signal be consistent, make the distortion minimum of signal.This moment, the peak value of signal can access the most effective eliminating, and core peak clipping vector
h nFrequency spectrum remain unchanged.
500, according to the peak clipping vector of multi-transceiver combination signal at peak point
Allh(t), multi-transceiver combination signal y (t) is carried out peak clipping handle, obtain the multi-transceiver combination signal z (t) after this peak point is finished the peak clipping processing.
For fear of the unmatched problem of frequency domain, get the L/2 zone, the left and right sides of the peak point that closes the road signal, and this multi-transceiver combination signal in L/2 zone, the left and right sides that closes the peak point of road signal is carried out peak value eliminate processing, obtain the signal z (t) of multi-transceiver combination signal after peak point is finished peak value and eliminated, specifically handle as follows:
z(t-i/2)＝y(t-i/2)-
allh n(t-i/2)，i＝±L
Just can finish to step 500 by above-mentioned steps 100 peak clipping of the signal that surpasses the peak clipping thresholding is handled, as shown in Figure 2, be schematic diagrames before and after the peak clipping of complex plane multi-carrier signal.
Method of the present invention is not only applicable to the situation of multi-carrier signal continuous dispensing, is applicable to the situation of the discontinuous distribution of multi-carrier signal yet.
Under the discontinuous distribution condition of multi-carrier signal, with 1.9 * 10
5～2.0 * 10
5There is not signal to be input as example in the frequency range, handle the frequency spectrum that obtains to utilizing method provided by the invention that the multi-transceiver combination signal is carried out peak clipping, with the method for utilizing prior art to provide the multi-transceiver combination signal is carried out peak clipping and handles the frequency spectrum that obtains, compare as follows:
As shown in Figure 3A, for method provided by the invention the multi-transceiver combination signal is carried out peak clipping and handle the spectrum diagram that obtains, obviously, 1.9 * 10
5～2.0 * 10
5In the frequency range, have only very faint noise signal, promptly distortion does not appear in the frequency spectrum of multi-transceiver combination signal after the peak clipping, and shown in Fig. 3 B, for the method that provides through prior art the multi-transceiver combination signal is carried out peak clipping and handle the spectrum diagram that obtains, obviously, 1.9 * 10
5～2.0 * 10
5In the frequency range, bigger noise signal is arranged, promptly distortion appears in the frequency spectrum of multi-transceiver combination signal after the peak clipping.As seen, no matter method of the present invention to the situation of multi-carrier signal continuous dispensing, still to the situation of the discontinuous distribution of multi-carrier signal, can make the distorted signals of handling through peak clipping reach minimum.
Second embodiment of the invention provides a kind of device that reduces the multi-carrier signal peak equal ratio, as shown in Figure 4, comprising: peak clipping signal vector regulatory factor acquiring unit, peak clipping vector generation unit and peak clipping processing unit;
Wherein, peak clipping signal vector regulatory factor acquiring unit, be used for determining the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point according to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point;
Peak clipping vector generation unit is used for according to each carrier signal determining the peak clipping vector of each carrier signal at this peak point at the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point;
The peak clipping processing unit is used for according to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping handle, and obtains the multi-transceiver combination signal after this peak point is finished the peak clipping processing.
The device of described reduction multi-carrier signal peak equal ratio further comprises: window function is searched the unit, be used to utilize window function to obtain to surpass amplitude and the phase place of the multi-transceiver combination signal of the peak clipping thresholding that is provided with at peak point, and, utilize window function to obtain amplitude and the phase place of each carrier signal at peak point.
Search the unit through above-mentioned window function, obtain the multi-transceiver combination signal in the amplitude of peak point and phase place and each carrier signal amplitude and phase place at peak point, can be with the multi-transceiver combination signal that obtains in the amplitude of peak point and phase place and each carrier signal in the amplitude and the phase place of peak point, directly offer peak clipping signal vector regulatory factor acquiring unit; Also can be with the multi-transceiver combination signal that obtains in the amplitude of peak point and phase place and each carrier signal amplitude and phase place at peak point, offer the phase place judging unit that the device of this reduction multi-carrier signal peak equal ratio further comprises, handle the back through the phase place judging unit and determine whether each carrier signal needs to carry out peak clipping and handle, and after definite each carrier signal need be carried out the peak clipping processing, with the needs of determining carry out each carrier signal that peak clipping handles at the amplitude of peak point and phase place and multi-transceiver combination signal in the amplitude and the phase place of peak point, offer peak clipping signal vector regulatory factor acquiring unit.
The phase place judging unit that the device of this reduction multi-carrier signal peak equal ratio further comprises, be used for searching the unit and obtain each carrier signal in the phase place of peak point and multi-transceiver combination signal phase place at peak point from described window function, and two phase places that will obtain compare, if the difference of two phase places greater than
, and less than π, it is zero at the peak clipping signal vector regulatory factor of this peak point that this carrier signal then is set; If the difference of two phase places less than
Perhaps greater than π, then will search each carrier signal that the unit provides phase place, and search multi-transceiver combination signal that the unit obtains phase place, offer peak clipping signal vector regulatory factor acquiring unit at peak point from described window function from described window function at peak point.
Described peak clipping vector generation unit comprises: subelement is set core peak clipping vector and the peak clipping vector generates subelement;
Wherein, core peak clipping vector is provided with subelement, is used to utilize each carrier wave to multiply by with carrier wave separately at the core peak clipping vector of peak point and obtains new core peak clipping vector in corresponding value of gripping altogether of central point of the core peak clipping vector of peak point;
The peak clipping vector generates subelement, be used at the peak clipping signal vector regulatory factor of peak point and according to core peak clipping vector the new core peak clipping vector that subelement obtains being set, determine the peak clipping vector of each carrier signal at this peak point according to each carrier signal.
Be example with six carrier signals below, to utilizing the described a kind of device that reduces the multi-carrier signal peak equal ratio of above-mentioned second embodiment, the detailed process of these six carrier signals being carried out the peak clipping processing describes:
As shown in Figure 5, during for practical application, the position of device in system of the described reduction multi-carrier signal peak equal ratio of second embodiment of the invention, each carrier signal is through behind the modulation spread spectrum and Filtering Processing of physical layer, be input to the device and the superimposer of the described reduction multi-carrier signal peak equal ratio of second embodiment of the invention respectively, each carrier signal that is input to superimposer obtains multi-transceiver combination signal y (t) through stack, the y (t) that obtains also is input to the device that reduces the multi-carrier signal peak equal ratio, simultaneously, pass through f
1, f
2... f
6Frequency point information under the different channels is input in the device of this reduction multi-carrier signal peak equal ratio, handles, just can obtain through the signal z (t) after the peak clipping processing through this device that reduces the multi-carrier signal peak equal ratio.
The structure drawing of device of above-mentioned reduction multi-carrier signal peak equal ratio specifically as shown in Figure 6, mainly comprises: peak clipping signal vector regulatory factor acquiring unit, peak clipping vector generation unit and peak clipping processing unit; This device may further include: window function is searched the unit; This device can further include: the phase place judging unit.Below the flow process of signal in this device carried out brief description:
The data message stream of multi-transceiver combination signal is input to window function and searches the unit; Window function is searched the unit by using window function and is obtained to surpass amplitude and the phase place of the multi-transceiver combination signal of the peak clipping thresholding tp that is provided with at peak point, and the multi-transceiver combination signal that obtains is input to the phase place judging unit in the amplitude and the phase place of peak point; Simultaneously, each carrier signal is input to respectively with each self-corresponding window function searches the unit; Window function is searched the unit by using window function and is obtained amplitude and the phase place of each carrier signal at peak point, and each carrier signal that will obtain offers the phase place judging unit in the amplitude and the phase place of peak point;
The phase place judging unit to each carrier signal at the phase place of peak point and multi-transceiver combination signal in the phase place of peak point, compare, if the difference of two phase places greater than
, and less than π, it is zero at the peak clipping signal vector regulatory factor of this peak point that this carrier signal then is set; If the difference of two phase places less than
Perhaps greater than π, then will search each carrier signal that the unit provides phase place, and search multi-transceiver combination signal that the unit obtains phase place, offer peak clipping signal vector regulatory factor acquiring unit at peak point from described window function from described window function at peak point;
Peak clipping signal vector regulatory factor acquiring unit also is the described process of step 200 in the first embodiment of the invention to the Signal Processing process specifically as shown in Figure 7, is not described in detail herein.Through the processing of this unit, obtain the peak clipping signal vector regulatory factor c α of each carrier signal
nAnd the peak clipping signal vector regulatory factor c α of each carrier signal that will obtain (t),
n(t), offer peak clipping vector generation unit;
Peak clipping vector generation unit also is step 300 and the described process of step 400 in the first embodiment of the invention to the Signal Processing process specifically as shown in Figure 8, is not described in detail herein.Processing through this unit obtains the peak clipping vector of multi-transceiver combination signal at peak point
Allh(t), and with the multi-transceiver combination signal that obtains peak clipping vector at peak point
Allh(t) offer the peak clipping processing unit;
The multi-transceiver combination signal that the peak clipping processing unit provides according to peak clipping vector generation unit is at the peak clipping vector of peak point
Allh(t), and the multi-transceiver combination signal is at the signal of this peak point, determines that the multi-transceiver combination signal finishes signal z (t) after peak clipping is handled at this peak point, and this process is identical with the described process of step 500 in the first embodiment of the invention, is not described in detail herein.
As shown in Figure 9, carry out peak clipping for these six carrier signals and handle front and back emulation schematic diagram, as seen, after these six carrier signals are carried out the peak clipping processing, each carrier signal is at the phase invariant of peak point, the proportional reduction of amplitude, the EVM (Error of Vector Magnitude, vector magnitude error) of the signal that peak clipping obtains after handling worsens minimum.
Pass through technique scheme, the embodiment of the invention passes through to surpass amplitude and the phase place of the multi-transceiver combination signal of the threshold value thresholding that is provided with at peak point, calculate the peak clipping vector of multi-transceiver combination signal at this peak point, and according to the peak clipping vector that calculates, the multi-transceiver combination signal is carried out peak clipping handle, obtain the multi-transceiver combination signal after this peak point is finished the peak clipping processing.The multi-transceiver combination signal of finishing after peak clipping is handled that obtains has reduced in the amplitude of peak point, and correspondingly its power at peak point has also reduced, thereby can effectively reduce the PAR of signal.Simultaneously, the peak clipping vector that utilizes when the technical scheme that the embodiment of the invention provides is carried out the peak clipping processing, be to obtain according to corresponding with it core peak clipping vector, the frequency spectrum of multi-carrier signal still mates after the peak clipping, so carrying out peak clipping for the carrier signal of continuous dispensing and discontinuous distribution handles, the frequency spectrum that obtains signal can distortion, and the technical scheme that the embodiment of the invention provides is only according to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping at peak point to be handled, just can finish the peak clipping processing so need not carry out multistage matched filtering, also do not have convolution algorithm accordingly, the few and system of operand is easy to realize.
In addition, by technical scheme provided by the invention, involutory road signal carries out the signal that obtains after peak clipping is handled, phase invariant, and amplitude is proportional to be reduced, and makes the distortion of signal reach minimum.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1, a kind of method that reduces the multi-carrier signal peak equal ratio is characterized in that, this method comprises:
According to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding, determine the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point;
At the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector, determine the peak clipping vector of each carrier signal according to each carrier signal at this peak point; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point;
According to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping handle, obtain the multi-transceiver combination signal after this peak point is finished the peak clipping processing.
2, the method for claim 1 is characterized in that, described method also comprises:
Utilize window function to obtain to surpass amplitude and the phase place of the multi-transceiver combination signal of the peak clipping thresholding that is provided with at peak point, and, utilize window function to obtain amplitude and the phase place of each carrier signal at peak point.
3, method as claimed in claim 2 is characterized in that, described method also comprises:
With each carrier signal at the phase place of peak point and multi-transceiver combination signal in the phase place of peak point, compare, if the difference of two phase places greater than
And less than π, it is zero at the peak clipping signal vector regulatory factor of this peak point that this carrier signal then is set.
4, the method for claim 1 is characterized in that, described peak clipping thresholding is to determine according to the target peak-to-average force ratio that the user is provided with.
5, the method for claim 1 is characterized in that, described core peak clipping vector is to utilize the frequency that taproot peak clipping vector multiply by corresponding carrier signal to determine.
6, method as claimed in claim 5 is characterized in that, described taproot peak clipping vector mates with the frequency domain of root raised cosine filter.
7, the method for claim 1, it is characterized in that, described according to each carrier signal at the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector, determine the peak clipping vector of each carrier signal at this peak point, comprising:
Utilize each carrier wave to multiply by with carrier wave separately and obtain new core peak clipping vector in corresponding value of gripping altogether of central point of the core peak clipping vector of peak point at the core peak clipping vector of peak point;
At the peak clipping signal vector regulatory factor of peak point and the new core peak clipping vector that obtains, determine the peak clipping vector of each carrier signal according to each carrier signal at this peak point.
8, a kind of device that reduces the multi-carrier signal peak equal ratio is characterized in that, described device comprises:
Peak clipping signal vector regulatory factor acquiring unit, be used for determining the peak clipping signal vector regulatory factor of multi-transceiver combination signal at this peak point according to the multi-transceiver combination signal of the peak clipping thresholding that surpass to be provided with peak clipping thresholding in the corresponding homophase site of the amplitude of peak point and phase place and setting; And, according to the multi-transceiver combination signal in the amplitude of the peak clipping signal vector regulatory factor of this peak point, multi-transceiver combination signal in the amplitude of this peak point and each carrier signal in the amplitude and the phase place of this peak point, determine the peak clipping signal vector regulatory factor of each carrier signal at this peak point;
Peak clipping vector generation unit is used for according to each carrier signal determining the peak clipping vector of each carrier signal at this peak point at the peak clipping signal vector regulatory factor of this peak point and corresponding with it core peak clipping vector; And, each carrier signal of determining is superposeed at the peak clipping vector of this peak point, obtain the peak clipping vector of multi-transceiver combination signal at this peak point;
The peak clipping processing unit is used for according to the peak clipping vector of multi-transceiver combination signal at peak point, the multi-transceiver combination signal is carried out peak clipping handle, and obtains the multi-transceiver combination signal after this peak point is finished the peak clipping processing.
9, device as claimed in claim 8 is characterized in that, described device also comprises:
Window function is searched the unit, is used to utilize window function to obtain to surpass amplitude and the phase place of the multi-transceiver combination signal of the peak clipping thresholding that is provided with at peak point, and, utilize window function to obtain amplitude and the phase place of each carrier signal at peak point.
10, install as claimed in claim 8 or 9, it is characterized in that described device also comprises:
The phase place judging unit is used for searching the unit from described window function and obtains each carrier signal in the phase place of peak point and the multi-transceiver combination signal phase place at peak point, and two phase places that will obtain compare, if the difference of two phase places greater than
And less than π, it is zero at the peak clipping signal vector regulatory factor of this peak point that this carrier signal then is set; If the difference of two phase places less than
Perhaps greater than π, then will search the phase place of each carrier signal of unit acquisition from described window function at peak point, and search multi-transceiver combination signal that the unit obtains phase place at peak point from described window function, offer peak clipping signal vector regulatory factor acquiring unit.
11, device as claimed in claim 8 is characterized in that, described peak clipping vector generation unit comprises:
Core peak clipping vector is provided with subelement, is used to utilize each carrier wave to multiply by with carrier wave separately at the core peak clipping vector of peak point and obtains new core peak clipping vector in corresponding value of gripping altogether of central point of the core peak clipping vector of peak point;
The peak clipping vector generates subelement, be used at the peak clipping signal vector regulatory factor and the described core peak clipping vector of peak point the new core peak clipping vector that subelement obtains being set, determine the peak clipping vector of each carrier signal at this peak point according to each carrier signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101789895A CN101453440B (en) | 2007-12-07 | 2007-12-07 | Method and apparatus for lowering multi-carrier signal PAR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101789895A CN101453440B (en) | 2007-12-07 | 2007-12-07 | Method and apparatus for lowering multi-carrier signal PAR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101453440A true CN101453440A (en) | 2009-06-10 |
| CN101453440B CN101453440B (en) | 2011-05-18 |
Family
ID=40735466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101789895A Active CN101453440B (en) | 2007-12-07 | 2007-12-07 | Method and apparatus for lowering multi-carrier signal PAR |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101453440B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011012026A1 (en) * | 2009-07-27 | 2011-02-03 | 中兴通讯股份有限公司 | Method and device for implementing self-adaptive peak clipping threshold communication system |
| CN102223338A (en) * | 2010-04-15 | 2011-10-19 | 电信科学技术研究院 | Self-adaption peak clipping method and device of multi-carrier system |
| CN102244626A (en) * | 2010-05-12 | 2011-11-16 | 中兴通讯股份有限公司 | Method and device for reducing peak to mean ratio of signal |
| CN102271105A (en) * | 2010-06-04 | 2011-12-07 | 电信科学技术研究院 | Intermediate frequency design method and device of broadband |
| CN102404265A (en) * | 2010-09-10 | 2012-04-04 | 电子科技大学 | Multicarrier signal processing method and device |
| WO2013056550A1 (en) * | 2011-10-20 | 2013-04-25 | 中兴通讯股份有限公司 | Peak clipping device and mobile communication system |
| CN103139120A (en) * | 2011-11-30 | 2013-06-05 | 鼎桥通信技术有限公司 | Digital predistortion processing method and device |
| CN104580056A (en) * | 2014-12-15 | 2015-04-29 | 联想(北京)有限公司 | Carrier adjustment method and carrier adjustment device for multi-carrier communication system |
| CN108833322A (en) * | 2018-04-09 | 2018-11-16 | 北京睿信丰科技有限公司 | A kind of the noise shaping despicking method and device of optimization |
| CN114584446A (en) * | 2020-11-30 | 2022-06-03 | 华为技术有限公司 | Carrier signal processing method, communication device and communication system |
| CN115442200A (en) * | 2022-11-09 | 2022-12-06 | 成都芯通软件有限公司 | Crest factor reduction processing method, crest factor reduction processing device, storage medium and communication equipment |
| US11770284B1 (en) | 2022-05-23 | 2023-09-26 | Meta Platforms, Inc. | Per carrier scaling of a cancellation pulse of a multi-carrier signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152493C (en) * | 2002-06-20 | 2004-06-02 | 上海交通大学 | Method for inhibiting peak-to-average ratio in orthogonal frequency division complex communication system |
| CN1538650B (en) * | 2003-04-16 | 2010-04-07 | 华为技术有限公司 | Multicarrier signal wave removing device and method |
| CN101076008B (en) * | 2007-07-17 | 2010-06-09 | 华为技术有限公司 | Method and apparatus for processing clipped wave |
-
2007
- 2007-12-07 CN CN2007101789895A patent/CN101453440B/en active Active
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011012026A1 (en) * | 2009-07-27 | 2011-02-03 | 中兴通讯股份有限公司 | Method and device for implementing self-adaptive peak clipping threshold communication system |
| CN102223338B (en) * | 2010-04-15 | 2013-10-16 | 电信科学技术研究院 | Self-adaption peak clipping method and device of multi-carrier system |
| CN102223338A (en) * | 2010-04-15 | 2011-10-19 | 电信科学技术研究院 | Self-adaption peak clipping method and device of multi-carrier system |
| CN102244626A (en) * | 2010-05-12 | 2011-11-16 | 中兴通讯股份有限公司 | Method and device for reducing peak to mean ratio of signal |
| CN102244626B (en) * | 2010-05-12 | 2015-01-28 | 中兴通讯股份有限公司 | Method and device for reducing peak to mean ratio of signal |
| CN102271105A (en) * | 2010-06-04 | 2011-12-07 | 电信科学技术研究院 | Intermediate frequency design method and device of broadband |
| CN102404265A (en) * | 2010-09-10 | 2012-04-04 | 电子科技大学 | Multicarrier signal processing method and device |
| CN102404265B (en) * | 2010-09-10 | 2016-08-24 | 电子科技大学 | A kind of multicarrier signal processing method and device |
| WO2013056550A1 (en) * | 2011-10-20 | 2013-04-25 | 中兴通讯股份有限公司 | Peak clipping device and mobile communication system |
| CN103139120A (en) * | 2011-11-30 | 2013-06-05 | 鼎桥通信技术有限公司 | Digital predistortion processing method and device |
| CN103139120B (en) * | 2011-11-30 | 2016-01-27 | 鼎桥通信技术有限公司 | Digital pre-distortion processing method and device |
| CN104580056A (en) * | 2014-12-15 | 2015-04-29 | 联想(北京)有限公司 | Carrier adjustment method and carrier adjustment device for multi-carrier communication system |
| CN108833322A (en) * | 2018-04-09 | 2018-11-16 | 北京睿信丰科技有限公司 | A kind of the noise shaping despicking method and device of optimization |
| CN114584446A (en) * | 2020-11-30 | 2022-06-03 | 华为技术有限公司 | Carrier signal processing method, communication device and communication system |
| US11770284B1 (en) | 2022-05-23 | 2023-09-26 | Meta Platforms, Inc. | Per carrier scaling of a cancellation pulse of a multi-carrier signal |
| CN115442200A (en) * | 2022-11-09 | 2022-12-06 | 成都芯通软件有限公司 | Crest factor reduction processing method, crest factor reduction processing device, storage medium and communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101453440B (en) | 2011-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101453440B (en) | Method and apparatus for lowering multi-carrier signal PAR | |
| CN101136890B (en) | Optimized multi-carrier signal slicing device and method therefor | |
| CN101227446B (en) | Method for reducing signal PAR based on self-adapting EVM | |
| CN102223338B (en) | Self-adaption peak clipping method and device of multi-carrier system | |
| CN101076008B (en) | Method and apparatus for processing clipped wave | |
| CN101150357B (en) | Method for eliminating peak power | |
| CN101232488B (en) | Communication method capable of reducing peak average power ratio of OFDM system | |
| CN102299883A (en) | Crest reduction method and device of broadband signal | |
| CN102111368B (en) | Signal crest reduction method and equipment | |
| CN100555890C (en) | The method of cutting peak power | |
| CN101771652B (en) | Amplitude limiting reserved sub carrier wave reduction PAPR method and system based on amplitude proportion factors | |
| CN101399792B (en) | Peak clipping device for reducing peak-average-ratio of transmission signal and method therefor | |
| CN101146080A (en) | A multi-carrier quick peak cutting device and method | |
| CN104601511A (en) | Multi-rate peak clipping method and device | |
| US8385466B2 (en) | Transmitting a signal from a power amplifier | |
| CN101350646B (en) | Apparatus and method for reducing peak power of intelligent antenna system | |
| CN102404273A (en) | Method for transmitting OFDM signals based on new companding transform | |
| CN102244626B (en) | Method and device for reducing peak to mean ratio of signal | |
| CN101547178B (en) | Linearization device and linearization method in broad-band communication system | |
| CN103812811A (en) | Automatic control apparatus and method of digital signal peak power | |
| WO2002015507A1 (en) | Method and apparatus for reducing multi-carrier signals ratio of peak power to average power | |
| CN116827388A (en) | PC-CFR algorithm developed based on FPGA and applicable to medium-voltage carrier communication system | |
| CN101447966B (en) | A method of controlling self-adapting adjusting peak-to-average ratio of threshold | |
| CN202841188U (en) | Peak clipping device of MSR system transmitter | |
| US8854946B2 (en) | Method and apparatus for generating standard cancellation signalstandard cancellation signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |