CN101848182A - Method and device for realizing adaptive peak clipping - Google Patents

Abstract

The invention relates to a method and a device for realizing adaptive peak clipping. The method comprises the following steps of: judging whether a data signal exists on each carrier of a plurality of carriers; if so, acquiring a power weight factor of the carrier; generating a multi-carrier peak clipping coefficient on a current time slot; and performing peak clipping on the signal of a multi-carrier physical layer by using the multi-carrier peak clipping coefficient. The invention shows that the method and the device can make the peak clipping more accurate and the scheme is also suitable for the peak clipping in various carrier modes.

Description

A kind of method and apparatus of realizing adaptive peak clipping

Technical field

The present invention relates to the mobile communication technology field, relate in particular to a kind of method and apparatus of realizing adaptive peak clipping.

Background technology

At present, along with TD-SCDMA (Division-Synchronous Code Division MultipleAccess, TD-SCDMA (Time Division-Synchronous Code Division Multiple Access)) supports increasing carrier wave, make that the PAR (Peak-to-Average Power Ratio, peak-to-average force ratio) of multi-carrier signal is also more and more higher.And thing followed problem is exactly the raising of dynamic range, makes the base station must consider Redundancy Design, thereby has caused the rising of cost; Wherein, influencing the most serious is radio-frequency (RF) power amplification, and promptly in order to ensure signal quality, radio-frequency (RF) power amplification will reduce power amplification efficiency, thereby can waste a large amount of power; Meanwhile, DAC in actual applications (digital to analog converter) also must consider to use the transducer of higher bit; And,, then in communication process, just can't well adopt DPD (digital pre-distortion) technology if PAR can't reduce.So, just must consideration how to reduce the PAR of multi-carrier signal based on the TD-SCDMA technology of multicarrier, released the algorithm of many PAR of reduction in the prior art for this reason, as follows:

The first is carried out the pulse cancellation algorithms of multicarrier at intermediate frequency: though the method is simple, but because the frequency spectrum of the frequency spectrum of peak clipping pulse and multicarrier coupling, when multicarrier timing in discontinuous minute, frequency spectrum can cause bigger distortion after the peak clipping, and peak value can not well eliminate.

Its two, China Patent No. is ZL 200520119365.2, denomination of invention have proposed according to the threshold value of threshold generator the multi-transceiver combination signal to be carried out hard clipping for the patent application of " a kind of reduction multicarrier peak-to-average force ratio device " a device; Carry out multistage matched filtering by the peak signal that will eliminate, generate the peak value offset signal, offset peak signal with this; Though and this device can reach the frequency spectrum coupling, but offseting signal often once is difficult to eliminate peak signal, so need multistage matched filtering, signal filtering, and a large amount of consumes resources of meeting, if use multiple-stage filtering then in present system, to be difficult to realize.

Above-mentioned dual mode all can't effectively be eliminated the PAR of continuous multi-carrier signal, for this reason, a kind of PC-CFR (PEAK CANCELLANTION CREAST FACTORREDUCTION has been proposed in the prior art, pulse reduces the peak clipping value to be handled) algorithm, though this algorithm can effectively eliminate continuous multi-carrier signal, but because its peak clipping filter factor relative fixed, thereby when the PAR to TD-SCDMA multicarrier signal of discontinuous when configuration carries out peak clipping, make to eliminate and handle underaction, handle thereby can not well carry out peak clipping.

Summary of the invention

In view of this, the present invention solves is discontinuous minute excessive problem of timing peak-to-average force ratio of TD-SCDMA multicarrier in the prior art.

For addressing the above problem, technical scheme provided by the invention is as follows:

A kind of method that realizes adaptive peak clipping comprises:

Judge whether there is data-signal in the multicarrier on each carrier wave, if then obtain the power weightings factor of described carrier wave;

Generate the peak clipping coefficient of multicarrier on the current time slots according to the power weightings factor of obtaining;

Utilizing described multi-carrier peak-clipping coefficient that the multicarrier physical layer signal is carried out peak clipping handles.

The power weightings factor when preferably, judging by the mode of flag bit indication whether current carrier wave exists data-signal and have data-signal.

Preferably, the described flag bit that utilizes judges that the power weightings factor when whether current carrier wave exists data-signal and have data-signal realizes by following steps:

After receiving the physical layer signal of multicarrier, judge wherein whether there is flag bit, if, then determine to have data-signal on the described carrier wave, extract described flag bit then, determine the power weightings factor of each carrier wave according to the value of flag bit.

Preferably, on each GP time slot described flag bit is set, perhaps increase is provided with described flag bit in the multicarrier physical layer signal.

Preferably, if the value of described flag bit is 0 or 1, then this flag bit only shows having or not of data-signal on this carrier wave; If the span of described flag bit is [0,10], then the power of this flag bit indication carrier wave is divided into 11 grades, and wherein value is 0 to show there is not data information transfer on this carrier wave, and value is 10 to show that information transmission and power maximum are arranged on this carrier wave.

Preferably, determine whether to have on the described carrier wave data-signal to exist, and when data-signal exists, obtain the power weightings factor of carrier wave by the mode of statistics amplitude by the mode of statistics.

Preferably, whether described mode by statistics determines to have on the described carrier wave data-signal existence to realize by following steps:

Add up the power of described carrier wave in the Preset Time continuously, if the described power that statistics obtains in the described Preset Time all is null value, the average power that statistics obtains in the perhaps described Preset Time then determines not have on this carrier wave data-signal to exist less than preset threshold value; Otherwise, determine to have on this carrier wave data-signal to exist.

Preferably, the time delay of utilizing Digital Up Convert to handle is finished the operation of described power statistic.

Preferably, whether described mode by statistics determines to have on the described carrier wave data-signal existence to realize by following steps:

Detect the numerical value of signal on continuous a plurality of carrier wave, if all be null value, then showing does not have data-signal to exist on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave.

Preferably, the power weightings factor obtained of the described basis peak clipping coefficient that generates multicarrier on the current time slots is realized by following formula:

$h\left(k\right)=p\left(k\right)\·\underset{i=1}{\overset{I}{\mathrm{\Σ}}}w\left(i\right)\·\mathrm{flag}\left(i\right)\·\exp (j\·\frac{2\mathrm{\π}\·f_i}{f_s}\·(k-N/2)),k=\mathrm{0,1,2}...N-1$

Wherein, h (k) is the peak clipping coefficient, and flag (i) is the value of flag bit, and I is a number of carriers, and N is the length of filter coefficient, f _iBe the center frequency point of i carrier wave, fs is the sampling rate of intermediate-freuqncy signal, and p (k) is the prototype filter coefficient, and w (i) is the power weightings factor on each carrier wave of i.

Preferably, when carrying out the peak clipping processing, if the processing delay of Digital Up Convert is very short, then preceding K chip of current time slots is utilized the peak clipping coefficient of last time slot setting to carry out peak clipping and handle, and utilize the time delay of this K chip to finish the generation of current time slots peak clipping coefficient.

Preferably, utilizing described multi-carrier peak-clipping coefficient that the multicarrier physical layer signal is carried out the peak clipping processing realizes by following steps:

After receiving the multicarrier physical layer signal, detect the peak signal point that surpasses predetermined threshold value, and determine the amplitude and the phase place of described peak signal;

According to the number of peak point, utilize described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence;

Again the peak signal of the peak clipping pulse that obtains and input is carried out handling to cutting with the peak clipping of finishing multicarrier.

A kind of device of realizing adaptive peak clipping, this device comprises: acquiring unit, generation unit and peak clipping unit; Wherein,

Described acquiring unit is used for judging on each carrier wave of multicarrier whether have data-signal, if then obtain the power weightings factor of described carrier wave;

The power weightings factor that described generation unit is used for obtaining according to described acquiring unit generates the peak clipping coefficient of multicarrier on the current time slots;

The multi-carrier peak-clipping coefficient that described peak clipping unit is used to utilize described generation unit to generate carries out the peak clipping processing to the multicarrier physical layer signal.

Preferably, described acquiring unit comprises: judge module and extraction module; Wherein,

After described judge module is used to receive the physical layer signal of multicarrier, judge wherein whether there is flag bit, if then determine to have data-signal on the described carrier wave, and notify described extraction module;

Described extraction module is used for extracting described flag bit according to the notice of described judge module, and determines the power weightings factor of each carrier wave according to the value of flag bit.

Preferably, described extraction module extracts described flag bit from described GP time slot, and when the value of described flag bit is 0 or 1, determines that this flag bit only shows having or not of data-signal on this carrier wave; When the span of described flag bit is [0,10], determine that the power of this flag bit indication carrier wave is divided into 11 grades, wherein value is 0 to show there is not data information transfer on this carrier wave, value is 10 to show that information transmission and power maximum are arranged on this carrier wave.

Preferably, described acquiring unit comprises: first statistical module and the 3rd statistical module; Wherein,

Described first statistical module is used for adding up continuously the power of described carrier wave in the Preset Time, if the described power that statistics obtains in the described Preset Time all is null value, the average power that statistics obtains in the perhaps described Preset Time then determines not have on this carrier wave data-signal to exist less than preset threshold value; Otherwise, determine to have on this carrier wave data-signal to exist, and notify described the 3rd statistical module;

Described the 3rd statistical module is used for the notice according to described first statistical module, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

Preferably, described acquiring unit comprises: second statistical module and the 3rd statistical module; Wherein,

Described second statistical module is used to detect the numerical value of signal on continuous a plurality of carrier wave, if all be null value, then showing does not have data-signal to exist on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave, and notifies described the 3rd statistical module;

Described the 3rd statistical module is used for the notice according to described second statistical module, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

Preferably, described peak clipping unit comprises: detection module, processing module and to cutting module; Wherein,

After described detection module is used to receive the multicarrier physical layer signal, detect the peak signal point that surpasses predetermined threshold value, and determine the amplitude and the phase place of described peak signal;

Described processing module is used for the number according to the detected peak point of described detection module, utilizes described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence;

It is described that module is used for peak clipping pulse that described processing module is obtained and the detected peak signal of detection module carries out handling cutting with the peak clipping of finishing multicarrier to cutting.

As can be seen, adopt method and apparatus of the present invention, obtain the power weightings factor of each carrier wave according to the physical layer signal of the multicarrier that receives, calculate the peak clipping coefficient of multicarrier on the current time slots again according to the frequency point information of described weighted factor and each carrier wave, utilize the peak clipping coefficient of described multicarrier that the multicarrier physical layer signal is carried out the peak clipping processing then, just PAR in the time of can well eliminating the discontinuous configuration of TD-SCDMA multicarrier with this, physical layer also need not to send the configuration information of carrier signal simultaneously, and can carry out in the ratio of power when the carrier wave peak clipping, thereby it is more accurate to make that peak clipping is handled; Simultaneously, this method also can be fit to the peak clipping processing of multiple carrier mode.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the method flow schematic diagram of the embodiment of the invention 1;

Fig. 2 is the schematic diagram of burst structure in the embodiment of the invention 1;

Fig. 3 comprises the peak clipping schematic flow sheet that utilizes the amplitude statistics mode to determine weighted factor in the embodiment of the invention 1;

Fig. 4 utilizes the peak clipping coefficient to carry out the schematic diagram that peak clipping is handled in the embodiment of the invention 1;

Fig. 5 is the schematic flow sheet of method when concrete application of the embodiment of the invention 1;

Fig. 6 is the apparatus structure schematic diagram of the embodiment of the invention 2.

Embodiment

Basic thought of the present invention is that the physical layer signal according to the multicarrier that receives obtains the power weightings factor of each carrier wave, calculate the peak clipping coefficient of multicarrier on the current time slots again according to the frequency point information of described weighted factor and each carrier wave, utilize the peak clipping coefficient of described multicarrier that the multicarrier physical layer signal is carried out the peak clipping processing then, just PAR in the time of can well eliminating the discontinuous configuration of TD-SCDMA multicarrier with this, physical layer also need not to send the configuration information of carrier signal simultaneously, and this method also can be fit to the peak clipping processing of multiple carrier mode.

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described; Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

The embodiment of the invention 1 provides a kind of method that realizes adaptive peak clipping, and as shown in Figure 1, this method comprises:

In step 101, judge whether there is data-signal in the multicarrier on each carrier wave, if then obtain the power weightings factor of described carrier wave; Concrete, generally, what give tacit consent to before obtaining the described power weightings factor is all to have data-signal to exist in the multicarrier on each carrier wave, still, often needs in the specific implementation to know earlier as the case may be that the data-signal on each carrier wave takies situation; For example, at present when digital intermediate frequency carries out peak clipping, the closing the road complex signal and can be modeled as of multicarrier:

$\underset{\&OverBar;}{y}\left(t\right)=\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{x}_n\left(t\right)\&CenterDot;\exp \left(\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="H2009100807077E0000021.png,H2009100807077E0000022.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}{f}_{n}t\right)$

Wherein

It is the signal after n carrier wave finished modulation spread spectrum Filtering Processing; And initialized carrier wave configuration can be carried out in the base station when the sub-district is set up, and the carrier wave peak clipping coefficient that the configuration of carrier wave is determined when utilizing the sub-district to set up is as follows:

$h\left(k\right)=p\left(k\right)\&CenterDot;\underset{i=1}{\overset{I}{\mathrm{\&Sigma;}}}\exp (j\&CenterDot;\frac{2\mathrm{\&pi;}\&CenterDot;f_i}{f_s}\&CenterDot;(k-N/2)),k=\mathrm{0,1,2}...N-1$

Wherein, h (k) is the peak clipping coefficient, and I is a number of carriers, and N is the length of filter coefficient, f _iBe the center frequency point of i carrier wave, fs is the sampling rate of intermediate-freuqncy signal; P (k) is the prototype filter coefficient, and the frequency spectrum of its frequency spectrum and intermediate-frequency filter mates substantially, and the generation of prototype filter can adopt the mode of frequency domain ideal filter+kaiser window to generate, and concrete the generation is exemplified below:

f1＝0.9/fs；

f2＝1.3＊f1；

filter_f＝firls(cfr_ntaps-1，[0?f1?f2?1]，[1?1?0?0]，[1?10])...

.＊kaiser(cfr_ntaps，5)′；

Wherein, cfr_ntaps is the length of prototype filter coefficient, and the scope that is provided with generally is between 120～256; If it is shorter to it should be noted that the length of prototype filter coefficient is provided with, just can save resource; If what be provided with is longer, meeting peak clipping effect can be more satisfactory, and concrete can specifically be provided with according to actual conditions, and the content that this is well known to those skilled in the art does not repeat them here;

But after the real operation of system, during user's access base station, can not guarantee that all carrier waves of the moment all have signal; As on I carrier wave of current time slots data-signal being arranged, but may just there be data-signal on this I carrier wave of next time slot, if adopt as above-mentioned fixing multi-carrier peak-clipping coefficient of the prior art this moment, not only can not make that then signal is effectively eliminated, and EVM (Error VectorMagnitude, error vector magnitude) worsening also can be very serious, and frequency spectrum also has distortion.

Based on this, present embodiment has proposed several modes of judging whether carrier wave has data-signal to exist and obtain the power weightings factor, only be elaborated with several examples below, but clearly described mode is not limited thereto;

1), utilize flag bit to judge power weightings factor when whether current carrier wave exists data-signal and have data-signal; After receiving the physical layer signal of multicarrier, judge wherein whether there is flag bit, if, then determine to have data-signal on the described carrier wave, extract flag bit wherein then, determine the power weightings factor of each carrier wave according to the value of flag bit; If not, then showing on the described carrier wave does not have data-signal, does not consider this carrier wave then when follow-up generation peak clipping filter factor; Wherein, it should be noted that described flag bit can be the setting that increases newly, also can be to be provided with on each GP (protection is at interval) time slot, for example:

A), increase a flag bit flag (i), indicate data occupancy situation on each carrier wave by this flag bit; Accordingly, the ratio that simultaneously also can indicate described carrier power w (i), the follow-up then weight that the multi-carrier peak-clipping filter factor of this carrier wave correspondence is set by carrier power again, the also i.e. power weightings factor of this carrier wave by the flag bit of this increase;

B), the last GP that 16 CHIP are all arranged of each time slot, in these 16 CHIP, select a CHIP, a flag bit promptly is set transmits that there is situation in data-signal on the carrier wave; The intermediate frequency process module promptly need not to have judged whether signal by CHIP like this, only needs can determine by the value of this flag bit whether data-signal is arranged on the carrier wave, thereby has further simplified the processing of intermediate frequency; Simultaneously, if the corresponding expanded range that flag bit is provided with, then this flag bit not only can show having or not of data-signal on this carrier wave, can also show power grade w (i); For example, if the value of flag bit is 0 or 1, then this flag bit can only show having or not of data-signal on this carrier wave; If the span of flag bit is [0,10], then but the power of this flag bit indication carrier wave is divided into 10 grades, 0 shows there is not data information transfer on this carrier wave, 1 shows that the information transmission is arranged on this carrier wave, but the power minimum, and 10 show that the information transmission is arranged on this carrier wave, and the power maximum, the rest may be inferred; Can determine carrier power weighted factor w (i) according to the value size of this flag bit then; By with the upper type step, when the carrier wave peak clipping, just can carry out, thereby it is more accurate to make that peak clipping is handled in the ratio of power.

2), determine whether to have on the described carrier wave data-signal existence, and obtain the power weightings factor of carrier wave by the mode of statistics; Concrete implementation is as follows, but is not limited thereto:

Whether A1), carry out power statistic in the given time determines to have on the described carrier wave data-signal to exist; Because it is after DUC that peak clipping is handled, so present embodiment proposes to import each time the power that DUC physical layer signal before all calculates its each carrier wave, if adding up the power of described carrier wave in a period of time continuously all is null value, perhaps add up average power in a period of time less than preset threshold value, then thinking does not have data-signal to exist on this carrier wave; Wherein, the described operation of carrying out power statistic is that the time delay of utilizing DUC to handle is finished;

A2), detect the numerical value of continuous a plurality of signals, if all be null value, then showing does not have the data-signal existence on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave; As everyone knows, all need protection between each time slot of all physical channels at interval, the TDiMA frame of a 10ms for example, be divided into two 5ms subframes, each subframe is divided into 7 conventional time slots and 3 special time slot: DwPTS (descending pilot frequency time slot), GP (protection at interval) and the UpPTS (uplink pilot time slot) that length is 675us again; And the physical content of time slot more normally has the burst of respective length, as shown in Figure 2, one of them burst comprises that two length are respectively that 352chips data block, one are long to be the protection time slot of 16chips for the midamble code block of 144chips and one are long, and the total length of data block is 704chips; What each time slot sended at first is data division, as long as and on this carrier wave data passes is arranged, then removing all should have data beyond the GP, even null value appears in a plurality of user stack once in a while, also almost nil but a N continuous numerical value all is the probability of null value; Therefore, all be null value if detect a N continuous signal, then can draw the inference that does not have data-signal to exist on this carrier wave; Otherwise, can determine to have on this carrier wave data-signal to exist; Simultaneously,, then need not the nil case that has of data-signal on each carrier wave of physical layer notice intermediate frequency, and intermediate frequency can be judged the situation that exists of data-signal on each carrier wave by the signal of input if above-mentioned condition is set up;

By the mode of above-mentioned statistics judge learn have data-signal on the carrier wave after, can determine the power weightings factor of carrier wave again by the amplitude of adding up each carrier wave, wherein, also can adopt the method for statistics amplitude of the prior art in the specific implementation, not repeat them here; Adopt this kind mode, in the specific implementation, receive the physical layer signal of the multicarrier that sends over respectively, the amplitude situation of each carrier wave that obtains according to statistics is provided with the weighted factor W (i) of carrier wave, again according to the frequency point information of each carrier wave and utilize described weighted factor W (i) to generate the multi-carrier peak-clipping coefficient, utilize the multicarrier physical layer signal after this multi-carrier peak-clipping coefficient is handled DUC to carry out the multi-carrier peak-clipping processing then, specifically as shown in Figure 3; Wherein, the various implementations that (step 103) handled in the generation (step 102) of described peak clipping coefficient and peak clipping are described in detail hereinafter, repeat no more herein;

In step 102, calculate the peak clipping coefficient of multicarrier on the current time slots according to the power weightings factor of obtaining; Concrete, the carrier wave peak clipping coefficient that the configuration of carrier wave is determined when utilizing the sub-district to set up in the existing method is

$h\left(k\right)=p\left(k\right)\&CenterDot;\underset{i=1}{\overset{I}{\mathrm{\&Sigma;}}}\exp (j\&CenterDot;\frac{2\mathrm{\&pi;}\&CenterDot;f_i}{f_s}\&CenterDot;(k-N/2)),k=\mathrm{0,1,2}...N-1$

And by the definite multi-carrier peak-clipping coefficient relative fixed of this mode, not only can not make that then signal is effectively eliminated, also can make the more serious of EVM deterioration, and frequency spectrum also has distortion; Therefore, the embodiment of the invention propose to be utilized the power weightings factor of the carrier wave that gets access to, and determines the multi-carrier peak-clipping coefficient according to the frequency point information of each carrier wave, specifically generates as followsly, but also is not limited thereto:

$h\left(k\right)=p\left(k\right)\&CenterDot;\underset{i=1}{\overset{I}{\mathrm{\&Sigma;}}}w\left(i\right)\&CenterDot;\mathrm{flag}\left(i\right)\&CenterDot;\exp (j\&CenterDot;\frac{2\mathrm{\&pi;}\&CenterDot;f_i}{f_s}\&CenterDot;(k-N/2)),k=\mathrm{0,1,2}...N-1$

Wherein, h (k) is the peak clipping coefficient, and flag (i) is the value of flag bit, and I is a number of carriers, and N is the length of filter coefficient, f _iBe the center frequency point of i carrier wave, fs is the sampling rate of intermediate-freuqncy signal, and p (k) is the prototype filter coefficient, and w (i) is the power weightings factor on each carrier wave of i; The peak clipping coefficient of Sheng Chenging in this manner carries out in the ratio (the power weightings factor of carrier wave) of carrier power in the time of can making follow-up carrier wave peak clipping, thereby can make more accurate that peak clipping handles;

In addition, if the processing delay of DUC is very short, for example has only the time delays of 1,2 CHIP, the peak clipping filter factor that then preceding K CHIP of current time slots still can be used last time slot to be provided with utilizes the time delay of this K CHIP to finish the generation of current time slots peak clipping filter factor simultaneously.

In step 103, utilize described multi-carrier peak-clipping coefficient that the multicarrier physical layer signal is carried out peak clipping and handle; Wherein, all be on the different hardware integrated circuit boards with intermediate frequency owing to physical layer in the specific implementation, so need not any extra communication between the different integrated circuit boards, just can know the signal operating position of transmitting on the carrier wave during intermediate frequency peak clipping, thereby reduce extra communication process; And determined peak clipping coefficient h (K) afterwards at each time slot, as shown in Figure 4, finish peak clipping in the following way and handle:

After receiving the multicarrier physical layer signal, at first carry out peak value and detect, surpass the peak signal point of predetermined threshold value, and determine the amplitude and the phase place of described peak signal with detection; Simultaneously according to the number of peak point, utilize described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence, shown in the following formula:

ps＝(|y _pk(t)|-A)·exp(j·angle(y _pk(t)))

Wherein, ps represents peak value scalar value, y _Pk(t) peak point of expression input signal; And, each peak clipping pulse can only eliminate a peak power point at the same time, and if the K level is arranged, K the peak value of in a period of time, can finishing dealing with, if detect and occur new peak value once more carrying out K peak value, then can adopt next stage to come peak clipping to handle;

Again the peak clipping pulse that obtains and the peak signal of input are carried out cutting, can be finished the peak clipping of multicarrier and handle; Certainly, the peak power point of final peak clipping sequence still needs and PS amplitude and equiphases such as (peak clipping scalar value); That is CP (t)=h (k) ps (t) k=0...N-1.

The foregoing description 1 has been described the process of multi-carrier peak-clipping in a preferred manner, and each goes on foot the preferred implementation of operation institute in the process of peak clipping; And the particular location of this multicarrier self-adapting peak-clipping method each step when concrete the application can be as shown in Figure 5, and certainly, those skilled in the art also understand easily, and a kind of optimal way when this only is concrete the application is not limited thereto.

Be mainly used in the TD-SCDMA system though it should be noted that the method for the foregoing description, this method equally also is applicable to ofdm system; Because of saying for ofdm system, because subcarrier allocation more at random, the ofdm signal of 20MHZ bandwidth for example, the distribution of subcarrier reaches 1200, so can not constantly recomputate the peak clipping filter factor because subcarrier is different, be that no matter how many subcarriers is for the signal of OFDM, it all is a peak clipping filter factor, the frequency spectrum coupling of this peak clipping filter spectrum and intermediate-frequency filter, thereby its also can exist with the above-mentioned background technology in the same problem that exists, promptly adopt fixing multi-carrier peak-clipping coefficient, not only can not make that then signal is effectively eliminated, and EVM worsen also can be very serious, and frequency spectrum also has distortion; And the method for utilizing the embodiment of the invention just can eliminate the PAR of ofdm system different sub carrier configuration.

In addition, the method for the foregoing description also is applicable to when multiple mobile communication system coexists, eliminates the processing of peak value jointly; For example TD-SCDMA system and ofdm system are jointly when intermediate frequency carries out the peak clipping processing, calculate the carrier wave number and the ofdm system carrier bandwidths of TD-SCDMA system in advance, the purpose of utilizing the method for the foregoing description to reach then to eliminate simultaneously TD-SCMD and OFDM to close the later peak point in road; Wherein, the peak clipping filter factor is as follows in the time of for TD-SCDMA and ofdm system coexistence, and the mode of concrete generating mode and the foregoing description is similar, does not repeat them here:

h _all(k)＝h _cdma(k)+h _ofdm(k)，k＝0，1，2...N-1

$h_{\mathrm{cdma}}\left(k\right)=p\left(k\right)\&CenterDot;\underset{i=1}{\overset{I}{\mathrm{\&Sigma;}}}w\left(i\right)\&CenterDot;\mathrm{flag}\left(i\right)\&CenterDot;\exp (j\&CenterDot;\frac{2\mathrm{\&pi;}\&CenterDot;f_i}{f_s}\&CenterDot;(k-N/2))$

As can be seen, adopt the method for the embodiment of the invention, obtain the power weightings factor of each carrier wave according to the physical layer signal of the multicarrier that receives, calculate the peak clipping coefficient of multicarrier on the current time slots again according to the frequency point information of described weighted factor and each carrier wave, utilize the peak clipping coefficient of described multicarrier that the multicarrier physical layer signal is carried out the peak clipping processing then, just PAR in the time of can well eliminating the discontinuous configuration of TD-SCDMA multicarrier with this, physical layer also need not to send the configuration information of carrier signal simultaneously, and can carry out in the ratio of power when the carrier wave peak clipping, thereby it is more accurate to make that peak clipping is handled.

Based on above-mentioned thought, the embodiment of the invention 2 has proposed a kind of device of realizing adaptive peak clipping again, and as shown in Figure 6, this device 600 comprises: acquiring unit 610, generation unit 620 and peak clipping unit 630; Wherein,

Described acquiring unit 610 is used for judging on each carrier wave of multicarrier whether have data-signal, if then obtain the power weightings factor of described carrier wave;

The power weightings factor that described generation unit 620 is used for obtaining according to described acquiring unit 610 generates the peak clipping coefficient of multicarrier on the current time slots;

The multi-carrier peak-clipping coefficient that described peak clipping unit 630 is used to utilize described generation unit 620 to generate carries out the peak clipping processing to the multicarrier physical layer signal.

Preferably, described acquiring unit 610 comprises: judge module 611 and extraction module 612; Wherein, after described judge module 611 is used to receive the physical layer signal of multicarrier, judge wherein whether there is flag bit, if then determine to have data-signal on the described carrier wave, and notify described extraction module 612; Described extraction module 612 is used for extracting described flag bit according to the notice of described judge module 611, and determines the power weightings factor of each carrier wave according to the value of flag bit.

It should be noted that described extraction module 612 extracts described flag bit from described GP time slot, and when the value of described flag bit is 0 or 1, determine that this flag bit only shows having or not of data-signal on this carrier wave; When the span of described flag bit is [0,10], determine that the power of this flag bit indication carrier wave is divided into 10 grades, wherein value is 0 to show there is not data information transfer on this carrier wave, value is 10 to show that information transmission and power maximum are arranged on this carrier wave.

In addition, described acquiring unit 610 also can comprise: first statistical module 613 and the 3rd statistical module 615; Wherein, described first statistical module 613 is used for adding up continuously the power of described carrier wave in the Preset Time, if the described power that statistics obtains in the described Preset Time all is null value, the average power that statistics obtains in the perhaps described Preset Time then determines not have on this carrier wave data-signal to exist less than preset threshold value; Otherwise, determine to have on this carrier wave data-signal to exist, and notify described the 3rd statistical module 615; Described the 3rd statistical module 615 is used for the notice according to described first statistical module 613, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

In addition, described acquiring unit 610 also can comprise: second statistical module 614 and the 3rd statistical module 615; Wherein, described second statistical module 614 is used to detect the numerical value of signal on continuous a plurality of carrier wave, if all be null value, then showing does not have data-signal to exist on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave, and notifies described the 3rd statistical module 615; Described the 3rd statistical module 615 is used for the notice according to described second statistical module 614, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

Preferably, described peak clipping unit 630 can comprise: detection module 631, processing module 632 and to cutting module 633; Wherein, after described detection module 631 is used to receive the multicarrier physical layer signal, detect the peak signal point that surpasses predetermined threshold value, and determine the amplitude and the phase place of described peak signal; Described processing module 632 is used for the number according to described detection module 631 detected peak points, utilizes described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence; It is described that module 633 is used for peak clipping pulse that described processing module 632 is obtained and detection module 631 detected peak signals carry out handling cutting with the peak clipping of finishing multicarrier to cutting.

Certainly, those skilled in the art understand, and realize in the foregoing description 2 that the device of repeat ACK/NACK transmission also can be regarded as user terminal or its part in the specific implementation; User terminal during described concrete implement also comprises the unit that device comprised described in the foregoing description when comprising each parts that domestic consumer's terminal is comprised; the user terminal that promptly comprises each unit of said apparatus also should be included within the scope that the present invention protects; but be not limited thereto, do not repeat them here.

It will be understood by those skilled in the art that and to use many different technologies and in the technology any one to come expression information, message and signal.For example, the message of mentioning in the above-mentioned explanation, information can be expressed as voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or above combination in any.

The professional can also further should be able to recognize, the unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in the above description.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each specific should being used for, but this realization should not thought and exceeds scope of the present invention.

The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (18)

1. a method that realizes adaptive peak clipping is characterized in that, comprising:

Judge whether there is data-signal in the multicarrier on each carrier wave, if then obtain the power weightings factor of described carrier wave;

Generate the peak clipping coefficient of multicarrier on the current time slots according to the power weightings factor of obtaining;

Utilizing described multi-carrier peak-clipping coefficient that the multicarrier physical layer signal is carried out peak clipping handles.

2. method according to claim 1 is characterized in that:

The power weightings factor when judging by the mode of flag bit indication whether current carrier wave exists data-signal and have data-signal.

3. method according to claim 2 is characterized in that, the described flag bit that utilizes judges that the power weightings factor when whether current carrier wave exists data-signal and have data-signal realizes by following steps:

After receiving the physical layer signal of multicarrier, judge wherein whether there is flag bit, if, then determine to have data-signal on the described carrier wave, extract described flag bit then, determine the power weightings factor of each carrier wave according to the value of flag bit.

4. method according to claim 3 is characterized in that:

On each GP time slot described flag bit is set, perhaps increase is provided with described flag bit in the multicarrier physical layer signal.

5. method according to claim 4 is characterized in that:

If the value of described flag bit is 0 or 1, then this flag bit only shows having or not of data-signal on this carrier wave; If the span of described flag bit is [0,10], then the power of this flag bit indication carrier wave is divided into 11 grades, and wherein value is 0 to show there is not data information transfer on this carrier wave, and value is 10 to show that information transmission and power maximum are arranged on this carrier wave.

6. according to any described method of claim 2 to 5, it is characterized in that the power weightings factor that described basis is obtained generates the peak clipping coefficient of multicarrier on the current time slots and realizes by following formula:

$h\left(k\right)=p\left(k\right)\&CenterDot;\underset{i=1}{\overset{I}{\mathrm{\&Sigma;}}}w\left(i\right)\&CenterDot;\mathrm{flag}\left(i\right)\&CenterDot;\exp (j\&CenterDot;\frac{2\mathrm{\&pi;}\&CenterDot;f_i}{f_s}\&CenterDot;(k-N/2)),k=0,1,2...N-1$

Wherein, h (k) is the peak clipping coefficient, and flag (i) is the value of flag bit, and I is a number of carriers, and N is the length of filter coefficient, f _iBe the center frequency point of i carrier wave, fs is the sampling rate of intermediate-freuqncy signal, and p (k) is the prototype filter coefficient, and w (i) is the power weightings factor on each carrier wave of i.

7. method according to claim 1 is characterized in that:

Determine whether to have on the described carrier wave data-signal to exist by the mode of statistics, and when data-signal exists, obtain the power weightings factor of carrier wave by the mode of statistics amplitude.

8. method according to claim 7 is characterized in that, whether described mode by statistics determines to have on the described carrier wave data-signal to exist is realized by following steps:

Add up the power of described carrier wave in the Preset Time continuously, if the described power that statistics obtains in the described Preset Time all is null value, the average power that statistics obtains in the perhaps described Preset Time then determines not have on this carrier wave data-signal to exist less than preset threshold value; Otherwise, determine to have on this carrier wave data-signal to exist.

9. method according to claim 8 is characterized in that:

The time delay of utilizing Digital Up Convert to handle is finished the operation of described power statistic.

10. method according to claim 7 is characterized in that, whether described mode by statistics determines to have on the described carrier wave data-signal to exist is realized by following steps:

Detect the numerical value of signal on continuous a plurality of carrier wave, if all be null value, then showing does not have data-signal to exist on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave.

11. method according to claim 1 is characterized in that:

When carrying out peak clipping and handle, if the processing delay of Digital Up Convert is very short, then preceding K chip with current time slots utilizes the peak clipping coefficient of last time slot setting to carry out the peak clipping processing, and utilizes the time delay of this K chip to finish the generation of current time slots peak clipping coefficient.

12. method according to claim 1 is characterized in that, utilizes described multi-carrier peak-clipping coefficient that the multicarrier physical layer signal is carried out the peak clipping processing and realizes by following steps:

After receiving the multicarrier physical layer signal, detect the peak signal point that surpasses predetermined threshold value, and determine the amplitude and the phase place of described peak signal;

According to the number of peak point, utilize described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence;

Again the peak signal of the peak clipping pulse that obtains and input is carried out handling to cutting with the peak clipping of finishing multicarrier.

13. a device of realizing adaptive peak clipping is characterized in that, this device comprises: acquiring unit, generation unit and peak clipping unit; Wherein,

Described acquiring unit is used for judging on each carrier wave of multicarrier whether have data-signal, if then obtain the power weightings factor of described carrier wave;

The power weightings factor that described generation unit is used for obtaining according to described acquiring unit generates the peak clipping coefficient of multicarrier on the current time slots;

The multi-carrier peak-clipping coefficient that described peak clipping unit is used to utilize described generation unit to generate carries out the peak clipping processing to the multicarrier physical layer signal.

14. device according to claim 13 is characterized in that, described acquiring unit comprises: judge module and extraction module; Wherein,

After described judge module is used to receive the physical layer signal of multicarrier, judge wherein whether there is flag bit, if then determine to have data-signal on the described carrier wave, and notify described extraction module;

Described extraction module is used for extracting described flag bit according to the notice of described judge module, and determines the power weightings factor of each carrier wave according to the value of flag bit.

15. device according to claim 14 is characterized in that:

Described extraction module extracts described flag bit from described GP time slot, and when the value of described flag bit is 0 or 1, determines that this flag bit only shows having or not of data-signal on this carrier wave; When the span of described flag bit is [0,10], determine that the power of this flag bit indication carrier wave is divided into 11 grades, wherein value is 0 to show there is not data information transfer on this carrier wave, value is 10 to show that information transmission and power maximum are arranged on this carrier wave.

16. device according to claim 13 is characterized in that, described acquiring unit comprises: first statistical module and the 3rd statistical module; Wherein,

Described first statistical module is used for adding up continuously the power of described carrier wave in the Preset Time, if the described power that statistics obtains in the described Preset Time all is null value, the average power that statistics obtains in the perhaps described Preset Time then determines not have on this carrier wave data-signal to exist less than preset threshold value; Otherwise, determine to have on this carrier wave data-signal to exist, and notify described the 3rd statistical module;

Described the 3rd statistical module is used for the notice according to described first statistical module, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

17. device according to claim 13 is characterized in that, described acquiring unit comprises: second statistical module and the 3rd statistical module; Wherein,

Described second statistical module is used to detect the numerical value of signal on continuous a plurality of carrier wave, if all be null value, then showing does not have data-signal to exist on this carrier wave; Otherwise then showing has data-signal to exist on this carrier wave, and notifies described the 3rd statistical module;

Described the 3rd statistical module is used for the notice according to described second statistical module, obtains the power weightings factor of carrier wave by the mode of statistics amplitude.

18. device according to claim 13 is characterized in that, described peak clipping unit comprises: detection module, processing module and to cutting module; Wherein,

After described detection module is used to receive the multicarrier physical layer signal, detect the peak signal point that surpasses predetermined threshold value, and determine the amplitude and the phase place of described peak signal;

Described processing module is used for the number according to the detected peak point of described detection module, utilizes described peak clipping coefficient to obtain the peak clipping pulse of each peak signal correspondence;

It is described that module is used for peak clipping pulse that described processing module is obtained and the detected peak signal of detection module carries out handling cutting with the peak clipping of finishing multicarrier to cutting.

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