CN101072057A - Method and device for searching signal peak power and despicking - Google Patents
Method and device for searching signal peak power and despicking Download PDFInfo
- Publication number
- CN101072057A CN101072057A CN 200610081618 CN200610081618A CN101072057A CN 101072057 A CN101072057 A CN 101072057A CN 200610081618 CN200610081618 CN 200610081618 CN 200610081618 A CN200610081618 A CN 200610081618A CN 101072057 A CN101072057 A CN 101072057A
- Authority
- CN
- China
- Prior art keywords
- signal
- peak
- power
- memory
- sequence
- 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
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The method includes steps: inputting the interpolation processed digital intermediate frequency signal to respective memory, and determining the powers of the inputted signals; if there is no such signal that its power exceeds threshold power, then the inputted signal passes through to the output; if there is signal with its power exceeds threshold power, then the method stores power of the signal; afterwards, finding out point of peak power from K pieces of stored power data, as well as generating corresponding peak clipping sequence, and accomplishing cutting down process pair wise between peak clipping sequence and signal sequence or cutting down process through multiple stages. The invention also discloses device for looking up peak power of signal and cutting down peak value, or for looking up peak power of signal in multiple stages, and cutting down peak value. Features are: quick, accuracy, and easy of implementation.
Description
Technical field
The present invention relates to the treatment technology of peak signal, relate in particular to a kind of method and apparatus of searching signal peak power and peak clipping.
Background technology
Adopt TD SDMA (TD-SCDMA, Time Division-Synchronous CodeDivision Multiple Access) system of technology, need a plurality of carrier waves to adopt identical training sequence (Midamble) sign indicating number at a N frequency point cell, and the N frequency point cell will merge at digital intermediate frequency, in the radio-frequency channel of back, overlap transmitter with shared one, will occur because the peak-to-peak superposition produces stronger signal peak-to-average ratio (PAPR at the antenna transmitting terminal like this, Peak to Average Power Ratio), peak power is too big, be easy to make emission of radio frequency signals to the inelastic region, thereby produce stronger side channel leakage power than (ACLR, Adjacent Channel Leakage power Ratio), reduce systematic function.If do not want to cause nonlinear distortion, the maximum power that transmits all must be less than the 1dB compression point, fall very lowly with regard to the average power that requires signal like this, but processing can make the efficient of power amplifier fall very lowly like this, the signal power of radio frequency transmission simultaneously can not reach the desired decibels of physical layer, thereby make the coverage of base station dwindle, user's signal power is impaired.
In order to reduce the peak-to-average force ratio of signal, people have proposed multiple solution.A class wherein is called the slicing method.A kind of slicing method adopts time domain peak clipping frequency domain filtering, but the time domain peak clipping carries out is nonlinear operation, still has very big spectrum leakage during filter by the back.People have further proposed to adopt the clipping method of digital interpolation technology for this reason, and this method makes nonlinear operation reduce, and systematic function improves.Use this class methods, should at first know the position of the peak power point that surpasses power threshold, have only the position that accurately obtains peak power point, effectively cutting peak power.
Digital despicking is handled at digital intermediate frequency, and the transmission rate of physical layer data is 1.28MCPS, carry out L times of interpolation by intermediate frequency after, speed is brought up to L*1.28MCPS.Carry out M times of interpolation before carrying out digital despicking again, this moment, speed reached L*M*1.28MCPS.So before peak clipping, a chip (CHIP) interpolation L*M doubly, this moment, signal data had very big correlation, can adopt method of derivation to carry out peak power point and search.
Prior art is utilized usually and is asked the first derivative of input signal data and the peak power point of second dervative picked up signal.When despiker detects input signal power above after the predefined threshold power, if power rises continuously, arrive certain some back and descend continuously, in theory, at this moment signal data is asked first derivative, the null point of derivative is exactly a peak power point.The general derivative of judgment data that adopts gets final product by just becoming negative on the actual treatment.Owing to there are influences such as system's inside and outside noise, changing can appear in signal.For example, descending can appear in uphill process in signal power.If judge that by just becoming to bear erroneous judgement will appear in peak value according to first derivative this moment.But this class signal is when power rises, and the step-length of rising usually greater than the step-length that descends, that is to say, the first derivative of signal data during for positive number than for negative the time absolute value big, still can judge signal in view of the above and be in ascent stage.This method has certain applicability, after but signal power arrives near the peak sometimes, the speed that rises can slow down, the step-length that also is rising is less than the step-length that descends, second dervative is for negative in other words, continue to adopt the method for front to judge, will make the peak power point that finds accurate inadequately, thereby have influence on later peak clipping effect.
The method that utilization asks two order derivatives to obtain signal peak power needs the power of first derivative, second dervative and the signal of stored signal data, contrast repeatedly then and find peak power and eliminate, the complexity that this has increased method makes real world applications be restricted.
Summary of the invention
In view of this, the technical problem that the present invention solves is to provide a kind of method of searching signal peak power and peak clipping, can realize searching fast and eliminating of peak power point.
For achieving the above object, the invention provides a kind of method with peak clipping of searching of the signal peak power based on the digital interpolation technology, comprising:
A1, when the power of input signal during, the power of the signal of beginning dynamic memory predetermined number greater than threshold power;
A2, when the input of new signal, the relatively power of this signal and its power of the signal of predetermined space before;
A3, when the power of this signal during less than the power of the signal of predetermined space before with it, then from the signal of this predetermined number, determine peak power point;
A4, the peak signal that comprises peak power point is carried out peak clipping.
Preferably, the definite peak power point in the described steps A 3 is: search the signal power maximum in the signal power of being stored, this maximum power is peak power.
Preferably, the peak clipping in the described steps A 4 is:
A41, peak power point placed the centre of peak signal sequence;
The corresponding peak clipping sequence of A42, generation and peak signal;
A43, with the sequence at peak signal place and peak clipping sequence to cutting.
Wherein, steps A 41 further comprises:
A411, peak power point moved to the mid portion of memory;
A412, the signal sequence before the peak power point is moved to the second portion of memory, and fill up second portion;
A413, the signal sequence of signal after the peak power point and new input is stored in the first of memory, the number of signals of storing up to number of signals and second portion that first stored equates.
Wherein, the peak clipping sequence described in the steps A 42 is one group of linear FIR filter coefficient; Steps A 42 comprises: according to the amplitude of peak signal and the amplitude and the phase place of phase place adjustment peak clipping sequence.
Wherein, to be that sequence and peak clipping sequence by described peak signal place is corresponding one by one subtract each other realization to cutting described in the steps A 43.
Preferably, in the steps A 1, when the power of input signal is less than or equal to threshold power, then described input signal is carried out buffer memory, simultaneously in the buffer at first the signal of buffer memory export at first.
Preferably, in the steps A 3, when the power of this signal during more than or equal to the power of the signal of predetermined space before with it, then to this signal buffer memory, simultaneously buffer at first the signal of buffer memory export at first.
Preferably, the power of input signal described in the steps A 1 is to obtain by the amplitude of extracting input signal; Amplitude is according to I road and Q road expression formula Amp={I
2+ Q
2}
1/2Obtain.
Preferably, input signal is in advance through L times and M digital interpolation processing doubly.
Preferably, predetermined space span described in steps A 2, the A3 be [min (and 16, M), max (16, M)]; Wherein, min (16, M) be illustrated in 16 and M in get minimum value; Max (16, M) be illustrated in 16 and M in get maximum; M is the multiple that the digital interpolation that carries out in advance of input signal is handled.
Preferably, the predetermined space span is more than or equal to 4 and smaller or equal to 10.
Preferably, this method also comprises: adopt preset second threshold power, second predetermined number and the signal repeated execution of steps A1 to A4 of second predetermined space to handling.
Wherein, second threshold power is lower than threshold power.
Wherein, second predetermined number equates with predetermined space with predetermined number, second predetermined space or is unequal.
Based on above-mentioned thought, realize the inventive system comprises: memory, peak detector, despiker.
Wherein, peak detector is used for the power and the threshold power of comparator input signal; When the power of input signal during greater than threshold power, the notice memory begins the power of the signal of dynamic memory predetermined number; When the input of new signal, the relatively power of this signal and its power of the signal of predetermined space before; When the power of this signal during, then from the signal of this memory stores, determine peak power point less than the power of the signal of predetermined space before with it.
Wherein, despiker is used for the peak signal that comprises peak power point is carried out peak clipping.
Wherein, also comprise the peak clipping sequence maker, be used for generating and the corresponding peak clipping sequence of peak signal.
The described despiker of described device be peak value to cutting device, be used for the sequence at peak signal place and peak clipping sequence cutting.
Wherein, the described memory of described device comprises first and second portion; When peak clipping, the signal before the memory second portion storage peak power point, the signal after the memory first storage peak power point, the intersection storage peak power point of memory first and second portion.
Wherein, described device also comprises derailing switch, is used for according to the instruction of described peak detector described despiker is exported or flowed to the data penetration transmission of described memory.
Wherein, described device also comprises the amplitude-phase extractor, is used to extract the amplitude of input signal and phase parameter to offer peak detector.
Another device of the present invention comprises at least two devices of searching signal peak power and peak clipping as mentioned above of cascade successively.Wherein, downstream component is used for the signal that preceding stage arrangement was handled is continued to search peak power and peak clipping.
Wherein, the threshold power of downstream component is lower than the threshold power of preceding stage arrangement.
The prior art of comparing, the power of the input signal of the present invention by relatively surpassing threshold power and the power of the signal of the predetermined space of storage before it are judged in this predetermined space to have or not peak power, and then are found out peak power point.Owing to just in the predetermined space scope, carry out searching of peak power point, avoided the storage of complicated differentiate that method of derivation carried out and mass data, therefore improved the seek rate of signal peak power.Because the predetermined space value is generally all very little, make differentiation fairly simple fast simultaneously, realize still on software is realized, all being easy to realization from hardware.Because data dependence and predetermined space value in the predetermined space are smaller, have improved the accuracy that the signal peak power point is searched greatly.
In addition, after finding peak power point, when realizing peak clipping,, so just can provide peak clipping sequence fast because linear finite impulse response filter coefficient is known, thus with the burst at peak power point place to cutting.In addition, also can carry out multistage search signal peak power and peak clipping.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method;
Fig. 2 is the schematic flow sheet of the inventive method embodiment 1;
Fig. 3 is the schematic diagram of memory of the present invention;
Fig. 4 is 5 times of later schematic diagrames of interpolation of TD-SCDMA signal;
Fig. 5 is the power profile of TD-SCDMA signal before and after peak clipping;
Fig. 6 is the schematic flow sheet of the embodiment of the invention 2;
Fig. 7 is embodiment 1 schematic diagram of apparatus of the present invention;
Schematic diagram when Fig. 8 is one tunnel for apparatus of the present invention input signal;
Schematic diagram when Fig. 9 is apparatus of the present invention multi-stage cascade.
Embodiment
In order to realize searching and effectively eliminating of peak power signal, the method for searching signal peak power and carrying out peak clipping of the present invention adopts mobile window method to carry out searching of signal peak power and peak clipping.In addition, the present invention also can further carry out multistage peak power signal and searches and eliminate.
In the method for the present invention, in the intermediate-freuqncy signal input memory separately, use mobile window method that the signal of importing is carried out the judgement of power, if there is not power to surpass the signal of threshold power, then Shu Ru data are not done any processing, transparent transmission output; If detect the signal that power surpasses threshold power, then begin to carry out searching of peak power point, and generate peak clipping sequence according to the size of peak power, with the peak signal in peak clipping sequence and the memory to cutting.
See also Fig. 1, the method for carrying out peak clipping after the peak power of searching fast of the present invention comprises:
A1, when the power of input signal during, the power of the signal of beginning dynamic memory predetermined number greater than threshold power;
A2, when the input of new signal, the relatively power of this signal and its power of the signal of predetermined space before;
A3, when the power of this signal during less than the power of the signal of predetermined space before with it, then from the signal of this predetermined number, determine peak power point;
A4, the peak signal that comprises peak power point is carried out peak clipping.
In the following embodiments, will be described in further detail with the process of carrying out digital despicking in the signal of storage, searching peak point.
See also Fig. 2, the flow process of searching peak power point and digital despicking among the embodiment 1 comprises:
Step 201:
I road and Q road signal input memory separately.
See also Fig. 3, the capacity present embodiment of memory is designed to L*M+K, and L enters the despiker interpolation multiple to physical layer before, and M is the interpolation multiple before the combine digital peak clipping in the despiker.The capacity of first's memory is L*M/2+K, and the capacity of second portion memory is L*M/2.First is filled with after the data, if the new data input is arranged, and the then data of first input store output earlier.
Step 202:
Extract the amplitude and the phase parameter of signal.
The amplitude of extracting signal can be obtained the power of signal.The phase place of extracting signal can be used for synchronous signal sequence and peak clipping sequence, avoids two sequences to produce phase deviation when aiming at peak clipping.When adopting two-way input signal (present embodiment is got and done I road and Q road), according to amplitude expression formula Amp={I
2+ Q
2}
1/2With phase place expression formula Phase=tan
-1{ I/Q} realizes Parameter Extraction.
Step 203:
Current input signal power compares with the threshold power of presetting.If input signal power is greater than threshold power, then mark begins searching of peak power point.If input signal power is less than or equal to threshold power, the then output of the data penetration transmission in the memory.Because peak power necessarily greater than threshold power, is searched peak power in surpassing the data area of threshold power, will dwindle seek scope, improves search efficiency.
Step 204:
Mark begins searching of peak power point, stores the power of a nearest K input signal.In order to save the capacity of memory, from this moment beginning only to store the power of a nearest K input signal.
Step 205:
The power of the power of current input signal and K signal of earlier stored compares.If less than the power of K signal of earlier stored, then thinking, the power of current input signal in the power of first position of memory and K position input signal peak power is arranged.If the power of current input signal is more than or equal to the input power of K signal of earlier stored, then the data penetration transmission in the memory is exported.
Observe the processing of TD-SCDMA data-signal before preparing to carry out digital despicking, just finished L*M interpolation doubly before detecting carrying out peak value, for example 60 * 4, this moment, signal data had very big correlation.A CHIP of physical layer by L*M times of interpolation after, the fluctuating of signal power is just more level and smooth.See also Fig. 4, adopted the TD-SCHMA signal of 5 times of interpolations, the fluctuating between the data symbol is just level and smooth a lot.
Think that thus the physical layer data of TD-SCDMA passes through after the L*M times of interpolation filtering, the fluctuating between each data is very little, and the correlation between the data is very big, so choose K data arbitrarily, their value all can be very approaching.Certainly the value of K can not be too big, and the too big then mean square deviation of data will become big.Certainly, if the interpolation multiple is very big, the K value also can suitably increase so, and mean square deviation can not alter a great deal, final still will be with reference to the ratio of K value and interpolation multiple L*M, generally get K＜＜L*M is advisable.
Input signal if power, then illustrates the current ascent stage that is in of signal greater than the power of K signal before it, does not also arrive peak power point after surpassing threshold power, that is to say, do not exist peak power point in the K scope this moment.This multiple by interpolation determined this judgement correctness (L*M＞＞K).If the signal power of current data is less than the signal power before K the data, think that so the power of current demand signal begins to descend, and between this K signal peak power point is arranged necessarily, because signal of every input all will carry out such comparison, so can not occur failing to judge.Though signal power descends in uphill process sometimes, even the step-length that descends sometimes is greater than the step-length that rises,, use the method to differentiate and still can guarantee correctness to a great extent.
For realizability, the span of K be [min (and 16, M), max (16, M)].In the present embodiment, M gets 4.The span of preferred K is more than or equal to 4 and smaller or equal to 10.Value that it should be noted that K is unsuitable too small, too small then for very little fluctuation, if adopt this rule erroneous judgement may occur; But the value of K is also unsuitable excessive, a plurality of peak power points of excessive then easy introducing, thus might occur failing to judge.
Step 206:
K signal power of storage compares.Maximizing in K signal.Writing down this peaked position is V, also is the position of peak power point.
Step 207:
Generate and the corresponding peak clipping sequence of peak signal.Peak clipping sequence is exactly one group of fixing linear finite impulse response (FIR) (FIR) filter coefficient, peak power point is also in central authorities, according to the situation of peak power detection each time, peak clipping sequence will adjust accordingly according to phase place of peak power and signal etc., so that when peak clipping, signal peak power can be cut low to the target value that sets.
Step 208:
Peak signal data is moved the mid portion of memory.All move the second portion of memory from peak-data data forward, because the capacity of memory second portion has only L*M/2, so a memory first last K-V data need be exported from memory, still the holding position is constant for V data before.
At this moment peak power point is in first position of memory second portion, thereby after having guaranteed that two part memories are filled with data, peak power point is at the mid portion of memory.
Step 209:
Start peak clipping and handle sign, the capacity of memory first becomes L*M/2 by L*M/2+K.This time the signal power of input is no longer judged, the signal of input just is stored into the first of memory, the data of newly arriving, the data of first are moved one after all in the memory, and present input data is placed on first of memory.Like this, peak signal has just moved to the mid portion of data in the memory.Because the peak power point of peak clipping sequence is in the central authorities of sequence, its distribute power left-right symmetric, after burst and peak clipping sequence were aimed at like this, peak-to-peak was cut mutually, will reach good peak clipping effect.
Step 210:
Memory first is filled with after the data of input, begins to carry out peak clipping and handles.
See also Fig. 5, peak clipping comprises the signal data and the peak clipping sequence of peak value when handling subtracts each other one by one, will make the peak power of signal be reduced to the threshold value that sets like this.
Step 211:
The capacity of memory first becomes L*M/2+K by L*M/2.Peak clipping is handled sign and is emptied.The signal data that peak clipping is handled is all exported.Wait for the input of new data.
Adopt present embodiment, because the K value is very little, the likelihood ratio that occurs two peak values in same window simultaneously is less, thus the treatment effeciency of exporting after the peak clipping than higher, and this kind method is simple.
Though it is very little to occur the probability of two peak points in the same window, in order to ensure not occurring failing to judge under the situation that two peak points in same window, occur, can adopt the mode of multi-stage cascade to handle, the peak power point that makes another one do not eliminated also can be detected by back one-level peak detector and eliminate.In addition, for big peak signal,, be necessary several times its peak power to be cut low to default target in order to reduce the adjustment difficulty of peak clipping sequence.
See also Fig. 6, embodiment 2 has provided the method that detects peak power point and carry out peak clipping by secondary cascade mode.The secondary detection device is set, and detection threshold (threshold power) reduces step by step.Eliminate after big peak signal is at first detected, the small leak signal eliminates after detecting by lower detection threshold.
Adopt the flow process of secondary cascade mode detection peak power and peak clipping to comprise:
Step 601 is to step 611, and is identical to step 211 with the step 201 of handling process described in the embodiment 1.
Step 612:
The signal data that the first order was handled is exported to second level peak value detection and is eliminated device continuation processing.
Step 613:
Extract the amplitude and the phase parameter of signal.
Step 614:
Current input signal power compares with the threshold power of presetting 2.If input signal power is greater than threshold power 2, then mark begins searching of peak power point.If input signal power is less than or equal to threshold power 2, the then output of the data penetration transmission in the memory.
This threshold power 2 is lower than threshold power set in the first order handling process 1.Certainly, threshold power 2 sometimes also can be identical with threshold power 1.
Step 615:
Mark begins searching of peak power point.From at this moment beginning only to store the power of a nearest K input signal.
Step 616:
K signal power of current input signal power and front compares.If less than the input power of K signal of earlier stored, then thinking, the power of current input signal in the power of first position of memory and K position input signal peak power is arranged.If the power of current input signal is more than or equal to the input power of K signal of earlier stored, then the data penetration transmission in the memory is exported.
Step 617:
K signal data of storage compares.Maximizing in K signal.Writing down this peaked position is V, also is the position of peak power point.
Step 618:
Generate and the corresponding peak clipping sequence of peak signal.Peak clipping sequence is exactly one group of fixing filter coefficient, peak power point is also in central authorities, according to the situation of peak power detection each time, peak clipping sequence will adjust accordingly according to phase place of peak power and signal etc., so that when peak clipping, signal peak power can be cut low to the target value that sets.
Step 619:
Peak signal data is moved the mid portion of memory.All move the second portion of memory from peak-data data backward, because the capacity of memory second portion has only L*M/2, so K-V data need be exported from memory, still the holding position is constant for V data before.
Step 620:
Start peak clipping and handle sign, the capacity of memory first becomes L*M/2 by L*M/2+K.This time the signal power of input is no longer judged, the signal of input just is stored into the first of memory, the data of newly arriving, the data of first are moved one after all in the memory, and present input data is placed on first of memory.Like this, peak signal has just moved to the mid portion of data in the memory.Because the peak power point of peak clipping sequence is in the central authorities of sequence, its distribute power left-right symmetric, burst and peak clipping sequence will be aimed at like this, and peak-to-peak is cut mutually, reaches good peak clipping effect.
Step 621:
Memory first is filled with after the data of input, begins to carry out peak clipping and handles.Peak clipping comprises the signal data and the peak clipping sequence of peak value when handling subtracts each other one by one, will make the peak power of signal be reduced to the threshold value that sets like this.
Step 622:
The capacity of memory first becomes L*M/2 by L*M/2+K.Peak clipping is handled sign and is emptied.The signal data that peak clipping is handled is all exported, and waits for the new data input then.
Except that the secondary peak clipping, the user can carry out peak clipping according to the progression that the actual conditions needs suitably increase cascade, such as three grades of peak clippings or level Four peak clipping, thereby the detection that realizes peak power point at last with eliminate.
With respect to preceding method, the present invention also provides the device of searching peak power and peak clipping, see also Fig. 7, first embodiment of apparatus of the present invention comprises: memory 701, amplitude-phase extractor 702, peak detector 703, derailing switch 704, peak clipping sequence maker 705, peak value are to cutting device 706.
Wherein, more current signal power and the threshold power of parameter that provide according to amplitude-phase extractor 702 of peak detector 703; When signal power during greater than threshold power, the searching of the notice memory 701 beginning stored signal data and the beginning peak power of marking; K signal power of the power of current input signal and earlier stored compares, if less than, then between Cun Chu first to K signal data peak power point is arranged; After peak detector 703 finds peak power, notice peak clipping sequence maker 705 generates the peak clipping sequence that is fit to, notify derailing switch 704 that the signal data in the memory 701 is let pass peak value to cutting device 706 simultaneously, then with peak clipping sequence to cutting, make the peak power of signal be reduced to the targets threshold of setting.
In other embodiments of the invention, input signal may be for one the road or more than the two-way.For example, see also Fig. 8, the device when input signal is a tunnel comprises: memory 801, amplitude-phase extractor 803, peak detector 802, derailing switch 804, peak clipping sequence maker 805, peak value are to cutting device 806.Wherein, memory 801 is used for also carrying out the data penetration transmission function simultaneously according to the necessary signal data of instruction storage of peak detector 802; Amplitude-phase extractor 803 is used to extract the amplitude and the phase parameter of signal; Derailing switch 804 is used for the outbound course of management data; Peak clipping sequence maker 805 is used for generating and the corresponding peak clipping sequence of peak signal; Peak value to cut device 806 be used to realize peak signal and peak clipping sequence to cutting.
Wherein, more current signal power and the threshold power of parameter that provide according to amplitude-phase extractor 803 of peak detector 802; When signal power during greater than threshold power, the searching of notice memory 801 these signal datas of storage and the beginning peak power of marking; K signal power of the power of current input signal and earlier stored compares; If less than, then between Cun Chu first to K signal data peak power point is arranged; After peak detector 802 finds peak power, notice peak clipping sequence maker 805 generates corresponding peak clipping sequence, notify derailing switch 804 that the signal data in the memory is let pass peak value to cutting device 806 simultaneously, then with peak clipping sequence to cutting, make the peak power of signal be reduced to the targets threshold of setting.
In addition, the present invention also provides the peak power detection of multi-stage cascade to eliminate device, for example, sees also Fig. 9, and the secondary peak power detection eliminates device and comprises: first order peak power detection eliminates device 901, second level peak power detection eliminates device 902.Wherein, first order peak power detection eliminates 901 pairs of input signal powers of device to be judged, by comparing with the threshold power of presetting 1, determines K signal power data of storage.Compare by K signal power data, the existence of peak power is judged current input signal power and storage.According to stored signal data and result of determination, determine the peak power point position and eliminate this peak power.First order peak power detection eliminates device 901 and the data of handling are all exported to second level peak power detection eliminates device 902.It is lower than threshold power 1 default in the first order that second level peak power detection eliminates threshold power 2 default in the device 902.After second level peak power detection eliminated the signal data that device 902 receives first order output, similar to the first order to the processing procedure of data, the signal data of handling was all exported.
Claims (23)
1, a kind of method of searching signal peak power and peak clipping is characterized in that, comprising:
A1, when the power of input signal during, the power of the signal of beginning dynamic memory predetermined number greater than threshold power;
A2, when the input of new signal, the relatively power of this signal and its power of the signal of predetermined space before;
A3, when the power of this signal during less than the power of the signal of predetermined space before with it, then from the signal of this predetermined number, determine peak power point;
A4, the peak signal that comprises peak power point is carried out peak clipping.
2, method according to claim 1 is characterized in that, determining in the described steps A 3 comprises: search the signal power maximum in the signal power of being stored, this maximum power is peak power.
3, method according to claim 1 is characterized in that, the peak clipping in the described steps A 4 comprises:
A41, peak power point placed the centre of peak signal sequence;
The corresponding peak clipping sequence of A42, generation and peak signal;
A43, with the sequence at peak signal place and peak clipping sequence to cutting.
4, method according to claim 3 is characterized in that, described steps A 41 comprises:
A411, peak power point moved to the mid portion of memory;
A412, the signal sequence before the peak power point is moved to the second portion of memory, and fill up second portion;
A413, the signal sequence of signal after the peak power point and new input is stored in the first of memory, the number of signals of storing up to number of signals and second portion that first stored equates.
5, method according to claim 3 is characterized in that, the peak clipping sequence described in the described steps A 42 is one group of linear filter coefficient; Described steps A 42 comprises: according to the amplitude of peak signal and the amplitude and the phase place of phase place adjustment peak clipping sequence.
6, method according to claim 3 is characterized in that: to be that sequence and peak clipping sequence by described peak signal place is corresponding one by one subtract each other realization to cutting described in the steps A 43.
7, method according to claim 1 is characterized in that: in the described steps A 1, when the power of input signal is less than or equal to threshold power, then described input signal is carried out buffer memory, simultaneously in the buffer at first the signal of buffer memory export at first.
8, method according to claim 1 is characterized in that: in the described steps A 3, when the power of this signal during more than or equal to the power of the signal of predetermined space before with it, this signal buffer memory then, simultaneously in the buffer at first the signal of buffer memory export at first.
9, method according to claim 1 is characterized in that: the power of input signal described in the described steps A 1 is to obtain by the amplitude of extracting input signal; Amplitude is according to I road and Q road expression formula Amp={I
2+ Q
2}
1/2Obtain.
10, according to each described method of claim 1 to 9, it is characterized in that: described input signal is in advance through L times and M digital interpolation processing doubly.
11, method according to claim 10 is characterized in that: described predetermined space span for [min (and 16, M), max (16, M)]; Wherein, min (16, M) be illustrated in 16 and M in get minimum value; Max (16, M) be illustrated in 16 and M in get maximum; M is the multiple that the digital interpolation that carries out in advance of input signal is handled.
12, method according to claim 10 is characterized in that: described predetermined space span is more than or equal to 4 and smaller or equal to 10.
13, method according to claim 1 is characterized in that, also comprises: adopt preset second threshold power, second predetermined number and the signal repeated execution of steps A1 to A4 of second predetermined space to handling.
14, method according to claim 13 is characterized in that: described second threshold power is not more than described threshold power.
15, method according to claim 13 is characterized in that: described second predetermined number equates with predetermined space with predetermined number, second predetermined space or is unequal.
16, a kind of device of searching signal peak power and peak clipping comprises memory, peak detector, despiker; It is characterized in that:
Described memory is used to store pending peak power and searches signal with peak clipping;
Described peak detector is used for the power and the threshold power of comparator input signal; When the power of input signal during greater than threshold power, the power of the signal of beginning dynamic memory predetermined number; When the input of new signal, the relatively power of this signal and its power of the signal of predetermined space before; When the power of this signal during, then from the signal of this memory stores, determine peak power point less than the power of the signal of predetermined space before with it;
Described despiker is used for the peak signal that comprises peak power point is carried out peak clipping.
17, device according to claim 16 is characterized in that: also comprise the peak clipping sequence maker, be used for generating and the corresponding peak clipping sequence of peak signal.
18, device according to claim 17 is characterized in that: described despiker be peak value to cutting device, be used for the sequence at peak signal place and peak clipping sequence cutting.
19, device according to claim 18 is characterized in that: described memory comprises first and second portion; When peak clipping, the signal before the memory second portion storage peak power point, the signal after the memory first storage peak power point, the intersection storage peak power point of memory first and second portion.
20, device according to claim 19 is characterized in that: also comprise derailing switch, be used for according to the instruction of described peak detector described despiker is exported or flowed to the data penetration transmission of described memory.
21, device according to claim 20 is characterized in that: also comprise the amplitude-phase extractor, be used to extract the amplitude of input signal and phase parameter to offer peak detector.
22, a kind of device of searching signal peak power and peak clipping is characterized in that: comprise at least two successively cascade as each described device of claim 16 to 21; And downstream component is used for the signal that preceding stage arrangement was handled is continued to search peak power and peak clipping.
23, device according to claim 22 is characterized in that: the threshold power of downstream component is lower than the threshold power of preceding stage arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100816180A CN101072057B (en) | 2006-05-11 | 2006-05-11 | Method and device for searching signal peak power and despicking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100816180A CN101072057B (en) | 2006-05-11 | 2006-05-11 | Method and device for searching signal peak power and despicking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101072057A true CN101072057A (en) | 2007-11-14 |
| CN101072057B CN101072057B (en) | 2012-04-18 |
Family
ID=38899073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100816180A Active CN101072057B (en) | 2006-05-11 | 2006-05-11 | Method and device for searching signal peak power and despicking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101072057B (en) |
Cited By (5)
| 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 |
| CN101640559B (en) * | 2008-07-31 | 2012-12-05 | 中兴通讯股份有限公司 | Method for reducing peak-to-average ratio of digital intermediate frequency signal |
| CN106452621A (en) * | 2016-07-19 | 2017-02-22 | 创达特（苏州）科技有限责任公司 | Peak power determining method, peak-to-average power ratio determining method, peak power determining device, and peak-to-average power ratio determining device |
| CN107871190A (en) * | 2016-09-23 | 2018-04-03 | 阿里巴巴集团控股有限公司 | A kind of operational indicator monitoring method and device |
| CN112073990A (en) * | 2020-09-09 | 2020-12-11 | 重庆重邮汇测电子技术研究院有限公司 | Method for realizing peak-to-average ratio detection in serial data stream |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1538650B (en) * | 2003-04-16 | 2010-04-07 | 华为技术有限公司 | Multicarrier signal wave removing device and method |
| JP2005269550A (en) * | 2004-03-22 | 2005-09-29 | Matsushita Electric Ind Co Ltd | Device and method for suppressing peak power |
| JP4515155B2 (en) * | 2004-05-25 | 2010-07-28 | 株式会社エヌ・ティ・ティ・ドコモ | Transmitter |
-
2006
- 2006-05-11 CN CN2006100816180A patent/CN101072057B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640559B (en) * | 2008-07-31 | 2012-12-05 | 中兴通讯股份有限公司 | Method for reducing peak-to-average ratio of digital intermediate frequency signal |
| 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 |
| CN106452621A (en) * | 2016-07-19 | 2017-02-22 | 创达特（苏州）科技有限责任公司 | Peak power determining method, peak-to-average power ratio determining method, peak power determining device, and peak-to-average power ratio determining device |
| WO2018014631A1 (en) * | 2016-07-19 | 2018-01-25 | 创达特（苏州）科技有限责任公司 | Method and apparatus for determining peak power, peak-to-average power ratio |
| CN106452621B (en) * | 2016-07-19 | 2018-03-06 | 创达特（苏州）科技有限责任公司 | A kind of peak power, the determination method and device of peak to average power ratio |
| US10805133B2 (en) | 2016-07-19 | 2020-10-13 | Triductor Technology (Suzhou) Inc. | Method and apparatus for determining peak power, peak-to-average power ratio |
| CN107871190A (en) * | 2016-09-23 | 2018-04-03 | 阿里巴巴集团控股有限公司 | A kind of operational indicator monitoring method and device |
| CN107871190B (en) * | 2016-09-23 | 2021-12-14 | 阿里巴巴集团控股有限公司 | Service index monitoring method and device |
| CN112073990A (en) * | 2020-09-09 | 2020-12-11 | 重庆重邮汇测电子技术研究院有限公司 | Method for realizing peak-to-average ratio detection in serial data stream |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101072057B (en) | 2012-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105101406B (en) | A kind of indoor orientation method and system based on wireless strengths | |
| CN101072057B (en) | Method and device for searching signal peak power and despicking | |
| CN102026342B (en) | WCDMA (wideband code division multiple access) cell search method and device | |
| US9100253B2 (en) | Block-based crest factor reduction | |
| CN102843328B (en) | Method for detecting PRACH (Physical Random Access Channel) sequence in TDD LTE (Time Division Duplex Long Term Evolution) system | |
| CN102869027B (en) | Method and device for detecting physical random access channel (PRACH) of multi-antenna base station | |
| CN111107031B (en) | Method and device for reducing signal peak-to-average ratio | |
| CN103685097B (en) | A kind of signal processing method, apparatus and system | |
| EP2645782B1 (en) | Carrier detection and parallel GSM cell search in multimode terminals | |
| US7609785B2 (en) | Mitigation of interference in cell search by wireless transmit and receive units | |
| CN106341865A (en) | Accurate sweep frequency method, device and terminal | |
| CN101478339A (en) | Method, apparatus and mobile terminal for implementing district searching precise time synchronization | |
| US10454735B2 (en) | Method and peak reduction unit for limiting a peak or group of peaks of an aggregated baseband carrier signal in a radio transmitter | |
| CN104980184A (en) | Method and equipment for cell search of TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system | |
| CN1855768B (en) | Coarse synchronizing method and device for cell searching | |
| CN111416786B (en) | Method for realizing coarse synchronization of cell search based on FPGA | |
| CN111865854A (en) | Frame capturing and synchronizing method of burst OFDM system | |
| CN113163424B (en) | NR cell PSS (Power System stabilizer) searching method for detection equipment and detection equipment | |
| CN1595834A (en) | Method and apparatus for initial synchronization in CDMA mobile communication system | |
| CN103687046A (en) | Detection method and apparatus of random access preamble sequence | |
| CN104735004A (en) | Interference elimination method and device used for cell search | |
| CN104581773B (en) | The cell detecting method and device of mobile communication system | |
| CN104022838B (en) | A kind of TD-LTE wireless signal frequency spectrum detecting method and system | |
| CN2757443Y (en) | Initial synchronous device in CDMA mobile communication system | |
| CN108880608A (en) | Small region search method and device based on LTE system |
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 |