CN101076008B - Method and apparatus for processing clipped wave - Google Patents
Method and apparatus for processing clipped wave Download PDFInfo
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- CN101076008B CN101076008B CN2007101302441A CN200710130244A CN101076008B CN 101076008 B CN101076008 B CN 101076008B CN 2007101302441 A CN2007101302441 A CN 2007101302441A CN 200710130244 A CN200710130244 A CN 200710130244A CN 101076008 B CN101076008 B CN 101076008B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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Abstract
The method comprises: detecting the s peak point signal which is over the preset threshold; according to said peak point signal over the preset threshold and the threshold, generating a clipping noise; according to the clipping noise, making clipping process. The invention also reveals a signal clipping treatment apparatus comprising a peak point detecting module and a clipping treatment module.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the slicing processing method and the equipment of signal in a kind of communication system.
Background technology
In legacy wireless communication system, the base station uses power amplifier and the user terminal that is distributed in the predetermined service area to communicate.And particularly at CDMA (CDMA Code Division Multiple Access, code division multiple access inserts)/WCDMA (Wireless CDMA, radio CDMA)/OFDM (OrthogonalFrequency Division Multiplex, OFDM) in the system, is generally the comprehensive of a plurality of subscriber signals in the down link signal.The synthetic envelope of sort signal can cause the PAR (PeakAverage Rate, peak-to-average ratio) of last signal very high, especially for the WCDMA/CDMA/OFDM signal of multicarrier.High PAR can strict limiting power amplifier linear requirement, cause the employed power amplifier in base station must amplify the concurrent signal that veers away after big of the signal with high PAR, reduced base station power amplification power output and efficient.
In order to make power amplifier reduce average power consumption, the processing that need prune peak value (slicing) to the signal waveform of multicarrier.The simplest direct clipping method directly blocks the amplitude of signal waveform for cutting method firmly in the prior art, and phase place remains unchanged.This method is to EVM (Error Vector Magnitude, Error Vector Magnitude) influence is very little, but shortcoming is, this clipping method can make signal have sharp edge and sharp peak, the of short duration duration at sudden change in the slicing process and slicing edge can produce significant out of band spectrum abnormal signal, as frequency spectrum distortion, adjacent band interference, spread spectrum etc., reduced signal transfer quality.
Another kind of clipping method of the prior art is the carrier phase processing of staggering, this method use retrodict and iteration repeatedly preferred, the optimum initial phase of selecting each carrier wave is to configuration, and it is minimum that peak value after a plurality of carrier waves merge is reduced to, and arrives the purpose of multicarrier slicing.This method can not influence original spectral characteristic, can reduce PAR yet, but shortcoming is that time delay is long, it is complicated to realize, need advance repeatedly preferred, simultaneously under different time slots and different code channel number situation, the phase place of each carrier wave all needs to readjust, and is unfavorable for that receiving equipment handles.
Summary of the invention
Embodiments of the invention provide a kind of slicing processing method and equipment of signal, thereby improve the power output and the efficient of base station power amplification with the peak-to-average ratio that reduces signal.
For achieving the above object, embodiments of the invention provide a kind of slicing processing method of signal, may further comprise the steps:
Detect the peak point signal that surpasses predefined thresholding in the input signal;
According to described peak point signal and the thresholding that surpasses predefined thresholding, generate clipped noise formation, the formation of clipping filter coefficient index and compensation formation, if the mould of the signal that detects is lower than threshold value or the mould of the signal that detects is higher than threshold value but be not peak point, then directly described signal is input to described compensation formation, if the mould of the signal that detects surpasses thresholding and is peak point, then carry out being input to the compensation formation after the computing above the peak point signal of thresholding and the ratio of threshold value and peak value according to described;
Upgrade described clipped noise formation and the formation of described clipping filter coefficient index;
According to clipped noise formation after the described renewal and the formation of clipping filter coefficient index, upgrade described compensation formation, the signal after handling by described compensation formation output slicing.
Embodiments of the invention also provide a kind of slicing treatment facility of signal, comprise peak detection block and slicing processing module:
Described peak detection block detects the peak point signal that surpasses predefined thresholding in the input signal;
Described slicing processing module, generate clipped noise according to detected peak point signal and the thresholding that surpasses thresholding of described peak detection block, formation of clipping filter coefficient index and compensation formation, if the mould of the signal that detects is lower than threshold value, or the mould of the signal that detects is higher than threshold value but is not peak point, then directly described signal is input to described compensation formation, if the mould of the signal that detects surpasses thresholding and is peak point, then carry out being input to the compensation formation after the computing above the peak point signal of thresholding and the ratio of threshold value and peak value, and according to described clipped noise described input signal is carried out slicing and handle according to described.
Compared with prior art, embodiments of the invention have the following advantages:
Embodiments of the invention adopt the peak value clipping method, the peak point signal that surpasses default thresholding is carried out slicing to be handled, reduce the peak-to-average ratio of signal in the system effectively, improved base station power amplification power output and efficient on the basis of agreement satisfying, effectively saved system resource.
Description of drawings
Fig. 1 is the system assumption diagram of signal wave elimination processing method in the embodiments of the invention one;
Fig. 2 is the schematic diagram of signal peak and predetermined threshold value in the embodiments of the invention one;
Fig. 3 is the flow chart that peak value detects in the embodiments of the invention one;
Fig. 4 is the renewal flow chart of peak value processing queue in the embodiments of the invention one;
Fig. 5 is a clipping filter modular structure schematic diagram in the embodiments of the invention one;
Fig. 6 is the schematic diagram that the peak value slicing is handled in the embodiments of the invention one;
Fig. 7 is a clipping filter modular structure schematic diagram in the embodiments of the invention two;
Fig. 8 realizes the structural representation that multistage slicing is handled in the embodiments of the invention three;
Fig. 9 is the structure chart of signal wave elimination treatment facility in the embodiments of the invention four.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described further.
In the embodiments of the invention one, a kind of system assumption diagram of signal clipping method as shown in Figure 1, there to be the three-channel carrier signal in this signal is example, comprise that mainly carrier wave closes the road processing and clipped noise produces two steps, and the multichannel carrier signal processing method is described identical with following steps.
Concrete, the carrier wave of signal closes the road processing procedure and may further comprise the steps:
Shaping filter: this process can be finished in Shape Filtering (shaping filter) module as shown in Figure 1, and purpose is data transaction one-tenth to be sent is adapted at the signal of Channel Transmission, reduces intersymbol interference.
Variable Rate is handled: this process can be finished in up-sampling (Upsampling) module as shown in Figure 1, and purpose is to improve signals sampling speed.
The carrier wave shift frequency: this process can after signal is handled through variable Rate, be done multiplying with Oscillator Freq Shift (shift frequency vibration) module as shown in Figure 1.
Closing the road handles: through after the above step, with three road signal plus, obtain closing the multi-carrier signal behind the road.
Concrete, the production process of clipped noise may further comprise the steps:
Weight factor is calculated: according to the power of unlike signal, calculate the signal shared share in clipping noise signal of not going the same way, and the signal that will close behind the road sends to Clipping Noise Generation (clipped noise generation) module.The power of signal is strong more, and share shared in the clipping noise signal that is produced is many more.
Clipped noise produces: this process can be finished in Clipping Noise Generation (clipped noise generation) module as shown in Figure 1.
The slicing filtering: this process can be finished in Optimum Clipping Filtering (best slicing filtering) module as shown in Figure 1, and the clipped noise that produces in the Clipping Noise Generation module is carried out filtering.
After obtaining closing the multi-carrier signal of handling on the road and clipping noise signal, adjust the delay inequality of two paths of signals after the process different disposal by the Delay module through slicing filtering.After delay inequality is eliminated, multi-carrier signal after the road can obtain slicing is closed in the two paths of signals stack.
In the embodiments of the invention one in the above-mentioned peak value slicing algorithm system structure, the clipped noise of Clipping NoiseGeneration (clipped noise generation) module produces and the slicing processing procedure of Optimum ClippingFiltering (best slicing filtering) module is described, a kind of method of peak value slicing has been proposed, only the peak signal that is higher than threshold value being carried out slicing handles, promptly, only three peak signals that are higher than threshold value are handled for as shown in Figure 2 signal.Wherein, the size of threshold value can be set in advance according to actual needs.This slicing processing procedure comprises that peak value detects, clipped noise generates, the clipped noise formation is upgraded, storage compensation formation renewal and the slicing main flow processs such as signal output after handling.
Figure 3 shows that the peak value testing process in this processing procedure:
Step s301, detect peak (peak) value, this implementation procedure is shown in Fig. 3 the first half.
At first according to the mould of every bit in Input_I and the Input_Q signal calculated, value and predefined threshold value Limit with this mould carries out then, whether the mould that detects this signaling point when being higher than threshold value is higher than the mould of last signaling point and next signaling point simultaneously, if be higher than simultaneously, illustrate that then this signaling point is a peak point, need carry out ensuing processing this moment to this peak point that is higher than threshold value.Though if the mould of this signaling point is lower than that the mould of threshold value or this signaling point is higher than threshold value is not peak point, then continues to detect next signaling point, and this signaling point is outputed to Compensation Memory Queue (compensation formation).Input signal Input_I in this step and Input_Q may be primary signal, also may be the stack of the clipped noise of primary signal and several times slicing generation before to the compensating signal of current demand signal.
Step s302, output clipped noise (noise), this implementation procedure is shown in Fig. 3 lower right-most portion.
When the mould of detected a certain signaling point (Current) is higher than threshold value Limit and is peak value, calculate the value of Divider Ksi (ratio of threshold value and peak value), Divider Ksi=Limit/Current;
According to this Divider Ksi value, calculate the value of clipped noise, among the figure, Peak_I and Peak_Q are each signaling point that the mould of peak point in the input signal surpasses the peak value of threshold value.The method of calculating the value of clipped noise according to the input signal peak value is:
This peak signal real part of the real part Pnoise_I=of clipped noise Peak_I * (Divider Ksi-1);
This peak signal imaginary part of the imaginary part Pnoise_Q=of clipped noise Peak_Q * (Divider Ksi-1).
Calculating also according to Divider Ksi simultaneously, output signal arrives Compensation Memory Queue (compensation formation):
Real part Peak_I * Divider the Ksi of the real part of output signal=this signal;
Real part Peak_Q * Divider the Ksi of the imaginary part of output signal=this signal.
The update signal of step s303, output Peaks_Queue (peak value sequence) and Filter_Coeff_Index_Queue (filter coefficient index sequence).
Wherein, the content among the Peaks_Queue is a clipped noise, and the content among the Filter_Coeff_Index_Queue is the index value of clipping filter coefficient, is used to search filter coefficient table.
After detecting peak value and exporting the Queue update signal, need carry out the renewal of Queue, the more new technological process of Queue is as shown in Figure 3 in the embodiments of the invention one:
After receiving the described Queue update signal of Fig. 3, Index_Queue_Register (index _ sequential register) upgrades, and wherein the content of Peaks_Queue and Filter_Coeff_Index_Queue is one to one, need upgrade synchronously.
Concrete, shown in Fig. 4 left-half, Pnoise_I and the Pnoise_Q that receives deposited in Max 0 and export Max_0, move queue pointer when receiving down a pair of Pnoise_I and Pnoise_Q, deposit Max 1 in and export Max_1, until all Max_Nmax of output.When formation was filled with, if receive new value once more, formation was shifted, and abandons the value that deposits in the earliest in the formation.
For Filter_Coeff_Index_Queue, when detecting new Pnoise_I and Pnoise_Q generation, shown in Fig. 4 right half part, composing initial value for the new value among the Filter_Coeff_Index_Queue is Order/2, wherein Order is the exponent number of clipping filter, whenever receive a new signal, the original value of Filter_Coeff_Index_Queue successively decreases 1 at every turn, stops to successively decrease when being decremented to 0.
Figure 5 shows that the processing procedure schematic diagram of slicing filtering, comprise index part, filter coefficient table, parallel multiplication part and compensation storage area.
Wherein, index part comprises clipped noise formation (Peaks_Queue), clipping filter coefficient index formation (Filter_Coeff_Index_Queue), queue length is M, and the value of this queue length M is chosen according to actual needs, generally depends on the probability size that peak value occurs.
Filter coefficient table storage clipping filter coefficient, when using FIR (Finite Impulse Response, finite impulse response) filter, use and the corresponding filter coefficient of FIR filter, this coefficient table length is filter order Order/2, and Order is the exponent number of clipping filter.
The calculation process of parallel multiplication is as follows: the value in the clipped noise formation (Peaks_Quene) is multiplied each other with corresponding filter coefficient Coeff and add up.Wherein, the corresponding filter coefficient Coeff of different Peaks values obtains according to clipping filter coefficient index formation (Filter_Coeff_Index_Queue) in the formation.Concrete accumulation method is: for i numerical value in two formations, search filter coefficient table according to the Ind_i in the formation of clipping filter coefficient index and obtain Coeff_i; Calculate MAX_i*Coeff_i; All MAX_i*Coeff_i values are added up and export, as the post-compensation signal.
Peak value slicing Filtering Processing flow process as shown in Figure 5 and Figure 6, wherein, the time-domain representation of the curve representation FIR filter among Fig. 6, the straight line of time t axle vertical direction is represented each sampled point of signal, the sampled point that dotted line connected is about the center signal symmetry.Wherein, the slicing processing queue direction of displacement of formation is for from right to left, and promptly X (i+order) is the signaling point of up-to-date input.As shown in Figure 6, if the signal sampling point of handling is a peak point, this peak point is carried out can exerting an influence with order/2 the signal sampling point in back to order/2 before this signal simultaneously in the slicing Filtering Processing process, therefore need carry out precompensation (preceding order/2 signal sampling point compensated) and post-compensation (order/2 the signal sampling point in back compensated).Up-to-date input signal point is X (i+order) among Fig. 6, carries out post-compensation earlier before sending into peak value formation detection, and all peak points are to the compensation of this sampled point before the current sampling point that promptly superposes.Carry out in the process of post-compensation,, the point of the signal sampling before the peak point is carried out precompensation according to FIR filter center symmetry principle.
An X of every input (i+order), Peaks_Queue content and respective filter coefficient Coeff multiply each other and add up as the post-compensation signal, after current input X (i+order) stack, send into the signal peak detection module again.Wherein, Dui Ying filter coefficient Coeff is searched in filter coefficient table by the index value among the Filter_Coeff_Index_Queue.When index value was 0, putting filter coefficient Coeff was 0.Signal peak detection module output signal is sent into the compensation formation.
Index value among the Filter_Coeff_Index_Queue also is used to calculate the index value that needs the input C (k) of compensation in compensation formation (Compensaion Memory Queue), k=i+order-2*Index-1.The signal of Order need compensation of storage in the compensation formation, the output of M complex multiplier is as input C (k) value addition corresponding in precompensation signal and the formation, and the result deposits and gets back in the compensation formation.An X of every input (i+order), the output signal after the C (i) in the output compensation formation handles as slicing compensates formation simultaneously and is shifted.
In the foregoing description one, precompensation is that Order the input C that is compensated that stores in the compensation formation compensated.Wherein the precompensation signal comes from the output of M complex multiplier, and M complex multiplier is input as Peaks_Queue here.So M the clipped noise through the peak signal of post-compensation of the calculating of precompensation signal before depending on promptly need calculate M clipped noise that passes through the peak signal of post-compensation of front earlier to the calculating of the compensating signal of current input signal.This makes has bigger resource consumption and complexity on calculating and logic realization.
For this reason, embodiments of the invention two have proposed a kind of slicing processing method of optimization.Adopt original input X to produce accordingly all or several clipped noises wherein.Promptly original input X is carried out peak value and detect, produce several clipped noises, method is identical with Fig. 3.Calculate corresponding several post-compensation signals according to these several clipped noises to current input signal.These several post-compensation signals are as the predicted value to true post-compensation signal, and whether the current input signal that is added to X and detection signal peak point surpass predefined thresholding.See Fig. 7, its structure and Fig. 5 are similar, and difference is to adopt the Max T～Max N of original peak value formation as the predicted value to true post-compensation signal, the current input signal that is added to X.Following step and Fig. 5 are described similar, signal after the peak value detection is input to the compensation formation, with each clipped noise and corresponding filter coefficient multiply each other as the precompensation signal and with the compensation formation in the respective value addition, signal and output after the signal in the compensation formation after the renewal is handled as described slicing.Since adopt new optimization slicing processing method, more convenient on feasible calculating and the logic realization, and property retention is constant.
For further optimizing the slicing performance, peak value slicing algorithm can carry out multistep treatment, to optimize output PAR.In the embodiments of the invention three, the framework that a kind of multistage slicing is handled can be determined the progression N that slicing is handled according to system resource and handling property as shown in Figure 8 in application.
Embodiments of the invention one to embodiment three propose a kind of slicing algorithm process method at multi-carrier signal.Adopt the method for peak value slicing, only the peak value that surpasses thresholding is carried out slicing, clipped noise detects with slicing peak value and produces.Only the clipping filter impulse response of storage and the generation of calculating peak value clipped noise reduces the multiplier number greatly, saves logical resource.Reducing on the resource base, can adopt multistage slicing to handle and optimize performance simultaneously.
Embodiments of the invention four provide a kind of slicing treatment facility of signal, as shown in Figure 9, comprising: input module 10, peak detection block 20 and slicing processing module 30.
The multi-carrier signal that input module 10 is handled needs sends to peak detection block 20.
The multi-carrier signal that peak detection block 20 sends input module 10 carries out peak value and detects, and when detecting the peak signal above threshold value, notice slicing processing module 30 is carried out slicing and handled.The original input signal that sends of input module 10 wherein, or the original input signal of crossing through the post-compensation signal compensation that overcompensation formation submodule 34 produces.
The signal that 30 pairs of peak detection block of slicing processing module 20 detect to the peak point that surpasses thresholding carries out the slicing processing, obtains the signal after slicing is handled.
Concrete, slicing processing module 30 comprises that further clipped noise generates submodule 31, clipped noise formation submodule 32, filter coefficient index queue submodule 33, compensation formation submodule 34 and output sub-module 35.
Wherein, clipped noise generates submodule 31, the signal of the peak point that surpasses thresholding that detects according to peak detection block 20 generates clipped noise, generate update signal simultaneously and send to clipped noise index submodule 32 and filter coefficient index queue submodule 33, and the generation compensating signal sends to compensation formation submodule 34.
Clipped noise formation submodule 32 generates the content that submodule 31 sends according to clipped noise, upgrades the clipped noise formation of storage inside, during queue full, abandons the value of importing the earliest in the formation.
Filter coefficient index queue submodule 33, generate the content that submodule 31 sends according to clipped noise, upgrade the formation of clipping filter coefficient index, this clipping filter coefficient index formation is corresponding with clipped noise formation submodule in the clipped noise formation submodule 32; During queue full, abandon the value of importing the earliest in the formation.
Above embodiment four described slicing treatment facilities, only the clipping filter impulse response of storage and the generation of calculating peak value clipped noise reduces the multiplier number greatly, saves logical resource.Reducing on the resource base, can adopt multistage slicing to handle and optimize performance simultaneously.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. the slicing processing method of a signal is characterized in that, may further comprise the steps:
Detect the peak point signal that surpasses predefined thresholding in the input signal;
According to described peak point signal and the thresholding that surpasses predefined thresholding, generate clipped noise formation, the formation of clipping filter coefficient index and compensation formation, if the mould of the signal that detects is lower than threshold value or the mould of the signal that detects is higher than threshold value but be not peak point, then directly described signal is input to described compensation formation, if the mould of the signal that detects surpasses thresholding and is peak point, then carry out being input to the compensation formation after the computing above the peak point signal of thresholding and the ratio of threshold value and peak value according to described;
Upgrade described clipped noise formation and the formation of described clipping filter coefficient index;
According to clipped noise formation after the described renewal and the formation of clipping filter coefficient index, upgrade described compensation formation, the signal after handling by described compensation formation output slicing.
2. the slicing processing method of signal according to claim 1 is characterized in that, the step that surpasses the peak point of predefined thresholding in the described detection signal is specially:
Judge current input signal or before in the composite signal of the clipped noise that produces of slicing to the post-compensation signal of current input signal and current input signal, whether the mould of peak point exceeds described thresholding.
3. the slicing processing method of signal according to claim 1 is characterized in that the step of described generation clipped noise formation specifically comprises:
Obtain described peak point signal and the thresholding that surpasses thresholding, and described thresholding and the described ratio that surpasses the peak point mould of thresholding;
Generate clipped noise according to described peak point signal and the described ratio that surpasses thresholding;
Described clipped noise is input to the clipped noise formation.
4. the slicing processing method of signal according to claim 1 is characterized in that the step of described generation clipping filter coefficient index formation specifically comprises:
Obtain and the corresponding clipping filter coefficient index of the clipped noise of described generation;
The corresponding clipping filter coefficient index of described clipped noise is input to the formation of clipping filter coefficient index.
5. the slicing processing method of signal according to claim 1 is characterized in that the step of described clipped noise formation of described renewal and the formation of described clipping filter coefficient index specifically comprises:
The clipped noise that newly obtains is stored into the rear of queue of described clipped noise formation, to store the rear of queue of clipping filter coefficient index formation with the corresponding clipping filter coefficient index of the described clipped noise that newly obtains into, when the formation of described clipped noise formation or the formation of described clipping filter coefficient index has been expired, abandon the signal of head of the queue.
6. the slicing processing method of signal according to claim 1 is characterized in that, the output step that described slicing is handled the back signal specifically comprises:
According to the clipping filter coefficient index in the formation of described clipping filter coefficient index, the inquiry filter coefficient table obtains and the corresponding filter coefficient of each described clipping filter coefficient index;
The described clipped noise that will produce through the described clipped noise that current input signal produced and/or the current input signal of post-compensation signal compensation, multiply each other with corresponding filter coefficient and add up as the post-compensation signal, superpose the back as new input signal with current input signal, carry out the detection whether signal peak value point surpasses described thresholding;
Described clipped noise and corresponding filter coefficient are multiplied each other the back as the precompensation signal, and with described compensation formation in the respective value addition, upgrade described compensation formation;
Every to new compensating signal of described compensation formation tail of the queue input, from signal of described compensation formation head of the queue output, as the signal output after the slicing processing.
7. the slicing processing method of signal according to claim 1 is characterized in that, export the signal after described slicing is handled after, also comprise:
Signal after the described slicing processing as input signal, is carried out again or the processing of slicing repeatedly.
8. the slicing treatment facility of a signal is characterized in that, comprises peak detection block and slicing processing module:
Described peak detection block detects the peak point signal that surpasses predefined thresholding in the input signal;
Described slicing processing module, generate clipped noise according to detected peak point signal and the thresholding that surpasses thresholding of described peak detection block, formation of clipping filter coefficient index and compensation formation, if the mould of the signal that detects is lower than threshold value, or the mould of the signal that detects is higher than threshold value but is not peak point, then directly described signal is input to described compensation formation, if the mould of the signal that detects surpasses thresholding and is peak point, then carry out being input to the compensation formation after the computing above the peak point signal of thresholding and the ratio of threshold value and peak value, and according to described clipped noise described input signal is carried out slicing and handle according to described.
9. as slicing treatment facility as described in the claim 8, it is characterized in that described slicing processing module further comprises:
Clipped noise generates submodule, the signal of the peak point that surpasses described thresholding that detects according to described peak detection block generates clipped noise, generate update signal simultaneously and send to described clipped noise index submodule and filter coefficient index queue submodule, and the generation compensating signal sends to described compensation formation submodule;
Clipped noise formation submodule generates the content that submodule sends, the clipped noise formation of updated stored according to described clipped noise;
Filter coefficient index queue submodule generates the content that submodule sends according to described clipped noise, upgrades the formation of clipping filter coefficient index, and the formation of described clipping filter coefficient index is corresponding with described clipped noise formation submodule;
Compensation formation submodule, generate the compensating signal generation compensation formation that submodule sends according to content of storing in the described clipped noise formation module and described clipped noise, initial input signal is compensated, and output slicing processing signals is to output sub-module;
Output sub-module, the signal after the output slicing is handled.
10. as slicing treatment facility as described in the claim 9, it is characterized in that, also comprise:
Input module is used for receiving inputted signal and accepts the compensation of described compensation formation submodule to its input signal.
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| CN2007101302441A CN101076008B (en) | 2007-07-17 | 2007-07-17 | Method and apparatus for processing clipped wave |
| PCT/CN2008/071670 WO2009010010A1 (en) | 2007-07-17 | 2008-07-17 | A method and device of clipping process of signal |
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| WO2009010010A1 (en) | 2009-01-22 |
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