CN102223338A - Self-adaption peak clipping method and device of multi-carrier system - Google Patents
Self-adaption peak clipping method and device of multi-carrier system Download PDFInfo
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Abstract
The embodiment of the invention provides a self-adaption peak clipping method and device of a multi-carrier system. The method comprises the following steps: receiving a multi-carrier combined signal of the multi carrier system; comparing the multi-carrier combined signal and a peak detection threshold to obtain the peak adjustment quantity of the signal over the peak detection threshold; and determining a multi-carrier peak clipping coefficient, and carrying out self-adaption peak clipping to the multi-carrier combined signal according to the multi-carrier peak clipping coefficient and the peak adjustment quantity. The embodiment of the invention also provides a self-adaption device of a multi-carrier system, which comprises a receiving module, a peak adjustment module and a peak clipping module. According to the method and the device provided by the embodiment of the invention, the problem of worsening of EVM (Error Vector Magnitude) during multi-carrier mixed modulation and unequal power transmission can be solved, simultaneously, under the conditions that the EVM and ACLR (Adjacent Channel Leakage Ratio) are met, the better peak clipping effect can be obtained under a mode of multi-carrier hybrid modulation, so that the multi-carrier combined signal has lower peak mean ratio, and the power amplifying cost can be effectively reduced.
Description
Technical field
The present invention relates to digital communicating field, particularly, the present invention relates to the self-adapting peak-clipping method and the device of multicarrier system.
Background technology
3G (3rd-Generation, 3G (Third Generation) Moblie technology) is meant the honeycomb mobile communication technology of supporting high speed data transfer.The 3G service can transmit sound and data message simultaneously, and on behalf of feature, it provide high-speed data service.
The 3G wireless communication system has all adopted multicarrier to carry out cell capacity-enlarging at present.In multi-carrier district, because needing the multi-carrier signal of emission partly to carry out linear superposition at digital intermediate frequency merges, a shared cover transmitter is launched, therefore the antenna transmitting terminal returns and higher peak-to-average force ratio signal occurs, so just require power amplifier to have the bigger range of linearity, thereby cause the efficient of power amplifier to reduce, and then cause the raising of power amplifier cost, at these problems that exist, in mobile communication system, adopt the peak clipping technology to reduce the signal peak-to-average ratio of ingoing power amplifier usually.
The implementation that reduces peak-to-average force ratio at present mainly contains peak value window, noise moulding and peak value offset scheme.Wherein peak value offset scheme complexity is minimum, and performance is also better.
In patent CN200710002958.4, considered according to each carrier wave power of baseband signal estimated value the respective filter adjustment that gains, multi-carrier signal behind the involutory then road carries out the matched filtering peak clipping to be handled, and avoids the distorted signals energy imbalance that uses the identical match filter gain to bring to the different carrier wave of power.But for the carrier wave of high modulation mode, especially 64QAM (Quadrature amplitudemodulation, quadrature amplitude modulation) is relatively more responsive to EVM (Error Vector Magnitude, error vector magnitude), is not easy to satisfy the EVM requirement.
But, PC-CFR (Peak Cancellation-Crest Factor Reduction, peak value offsets crest factor to be reduced) present situation of peak clipping algorithm is that present product is when realizing, general power and the requirement of the EVM under the different modulating mode difference of also not considering carrier wave, its peak-to-average force ratio that can suppress is limited.Mainly comprise following 2 problems:
(1) in the actual environment, owing to the influence of power control to the R4 carrier wave, and the difference of each carrier wave code channel occupancy, the power of carrier wave may be inequality, and the power difference maximum of intercarrier can reach 20db.If adopt the PC-CFR algorithm of not considering carrier power, it is more serious to make that lower-powered carrier wave EVM worsens.
(2) in the actual networking, can be divided into the R4 business for downlink business, promptly based on speech business, QPSK modulation system, and H (High Speed Downlink Packet Access, high speed downlink packet inserts) business, i.e. data service.H is professional can to select the different modulating mode according to its channel quality, increase along with number of modulation levels, signal is also responsive more to noise, and the restriction to the EVM of high modulation technology among the 3GPP (3rd Generation Partnership Project, third generation partner program) is also strict more.If the carrier wave to the different modulating mode waits the PC-CFR peak clipping that gains, the deterioration degree EVM of each carrier wave is similar so, is unfavorable for further reducing peak-to-average force ratio.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, take all factors into consideration the power of carrier wave and the antijamming capability of different modulating mode especially, the multi-transceiver combination signal is carried out the digital intermediate frequency peak clipping handle, proposed a kind of self-adapting peak-clipping method and device of multicarrier system.
For achieving the above object, an aspect of embodiments of the invention has proposed a kind of self-adapting peak-clipping method and device of multicarrier system, may further comprise the steps:
Receive the multi-transceiver combination signal of multicarrier system;
Described multi-transceiver combination signal and peak value detection threshold are compared, will carry out the peak value adjustment, obtain the peak value adjustment amount above the signal of peak value detection threshold;
Determine the multi-carrier peak-clipping coefficient, the adjusted described multi-transceiver combination signal of peak value is carried out adaptive peak clipping according to described multi-carrier peak-clipping coefficient, peak value adjustment amount.
The adaptive peak clipping device that has proposed a kind of multicarrier system on the other hand of embodiments of the invention comprises receiver module, peak value adjusting module and peak-clipping module,
Described receiver module is used to receive the multi-transceiver combination signal of multicarrier system;
Described peak value adjusting module is used for described multi-transceiver combination signal and peak value detection threshold are compared, and will carry out the peak value adjustment above the signal of peak value detection threshold, obtains the peak value adjustment amount;
Described peak-clipping module is used for determining the multi-carrier peak-clipping coefficient, and the adjusted described multi-transceiver combination signal of peak value is carried out adaptive peak clipping according to described multi-carrier peak-clipping coefficient, peak value adjustment amount.
According to the method and the device of the embodiment of the invention, the difference of taking all factors into consideration multi-carrier power is different without the antijamming capability of the carrier wave of modulation system with employing, the EVM deterioration problem when having solved the emission of multicarrier compound modulation and unequal power.Simultaneously satisfying EVM and ACLR (AdjacentChannel Leakage Ratio, the adjacent channel leakage ratio) under the condition that requires, under multicarrier hybrid modulation pattern, can obtain better peak clipping effect, make the multi-transceiver combination signal have more low peak average ratio, reduce the power amplifier cost greatly.
The such scheme that the present invention proposes, very little to the change of existing system, can not influence the compatibility of system, and realize simple, efficient.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the FB(flow block) according to the self-adapting peak-clipping method of the multicarrier system of the embodiment of the invention;
Fig. 2 is according to adaptive peak clipping algorithm schematic diagram of the invention process;
Fig. 3 is the structured flowchart according to the adaptive peak clipping device of the multicarrier system of the embodiment of the invention;
Fig. 4 is for considering intercarrier power, not the original signal spectrum schematic diagram during peak clipping;
Fig. 5 is signal peak-to-average ratio CCDF after the primary signal peak clipping among Fig. 4 (ComplementaryComplementary Cumulative Distribution Function, a contrary cumulative distribution function) curve comparison diagram
Fig. 6 is for considering the carrier modulation mode, not the original signal spectrum schematic diagram during peak clipping
Fig. 7 is a signal peak-to-average ratio CCDF curve comparison diagram after the primary signal peak clipping among Fig. 6
Fig. 8 is the spectrum diagram according to the peak clipping filter of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
At first peak value window method, noise moulding scheme and peak value offset scheme are introduced the present invention in order better to explain.
Specifically, peak value window method (PW-CFR, Peak Window-Crest Factor Reduction) be meant will be higher than the hard peak clipping pulse of thresholding through filter smoothing, come the expansion of inhibition zone external spectrum, its performance depends on the window that adopted and the length of window.Filter order is high more, and it is many more to influence sampled point, and the EVM index worsens just big more.On the other hand, multicarrier the probability of continuous peak value occurs in a period of time can be bigger, because the filter of higher exponent number may cause the situation that signal is repeated weighting, peak value window method is carried out the desirable slicing effect of the just impossible acquisition of peak clipping to multi-carrier signal like this during the realization of peak value window crest suppression method.
Noise moulding scheme (NS-CFR, Noise Shaping-Crest Factor Reduction) is meant by calculating the peak clipping threshold value that input signal power obtains dynamic change, cut down all sampled points that surpass some thresholdings based on this threshold value then, and the error signal of calculating and primary signal.Error signal is subsequently by the noise moulding, dropped within the signal band by the noise that amplitude limit causes guaranteeing.Through the cancellation from primary signal subsequently of noise shaped error signal, thereby reduce PAPR (Peak to Average Power Ratio, peak-to-average power ratio).Above-mentioned processing may cause peak value to rise once more.
Peak value offset scheme PC-CFR technology is meant and adopts the technology that is similar to NS-CFR to dwindle PAPR.Yet different with above-mentioned NS-CFR is, the offseting signal of being regenerated by spectrum shaping in the PC-CFR scheme is based on peak value sampling point, promptly surpasses the maximum in the thresholding area sampling point.This signal is used to cut down the parent mass peak value signal above thresholding after handling through suitable delay.As the method for simplifying of only cutting down with the peak value sampling point, its distortion factor is less, and only needs computation burden still less.
Comprehensive three kinds of methods, the PC-CFR complexity is minimum, and performance is also better.But the present situation of PC-CFR peak clipping algorithm is a present product when realizing, it is different not consider not also that generally the power of carrier wave and the EVM under the different modulating mode require, and its peak-to-average force ratio that can suppress is limited.
Therefore the embodiment of the invention need provide a kind of, and the difference of taking all factors into consideration multi-carrier power is different without the antijamming capability of the carrier wave of modulation system with employing, the self-adapting peak-clipping method with better peak clipping effect.
In order to realize the present invention's purpose, the invention discloses a kind of self-adapting peak-clipping method of multicarrier system, Fig. 1 shows the FB(flow block) of said method.This method comprises the steps:
S101: the multi-transceiver combination signal that receives multicarrier system.
In conjunction with shown in Figure 2, adopt Digital Up Convert to signal modulate, spread spectrum and Filtering Processing, obtain each road carrier signal.Above-mentioned each road carrier signal is superposeed, obtain the multi-transceiver combination signal.Receive the multi-transceiver combination signal of above-mentioned multicarrier system.
Above-mentioned multi-transceiver combination signal can be expressed as:
Wherein, x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number.
S102: multi-transceiver combination signal and peak value detection threshold are compared, will carry out the peak value adjustment above the signal of peak value detection threshold.
In conjunction with shown in Figure 2, above-mentioned multi-transceiver combination signal is found out peak value window by peak detection block.Specifically, according to multi-transceiver combination signal y (i) and peak value detection threshold A
1, find out peak value window, promptly | y (i) |＞A
1, i ∈ [i
1, i
2], wherein,
x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number.
Pass through following formula | y (i) |＞A
1, i ∈ [i
1, i
2] as can be known, if all samples all below target gate, transmit y (i), algorithm finishes.Otherwise, in peak value window, find the peak-peak position at i
Max, the peak point data are y (i
Max).
To carry out the peak value adjustment above the signal of peak value detection threshold, calculate maximal peak point y (i
Max) and the peak clipping threshold value A
2Difference,
a(i
max)＝y(i
max)-A
2exp(j*angle(y(i
max)))，
Guarantee difference a (i
Max) amplitude and phase place and peak point remain unchanged.
Wherein, peak value detection threshold A
1Generally to be higher than the peak clipping threshold value A slightly
2, i.e. A
1〉=A
2
S103: determine the multi-carrier peak-clipping coefficient, the adjusted multi-transceiver combination signal of peak value is carried out adaptive peak clipping according to multi-carrier peak-clipping coefficient and peak value adjustment amount.
Before adjusted multi-transceiver combination signal carries out adaptive peak clipping to peak value, at first to determine the multi-carrier peak-clipping coefficient.In the present embodiment, calculate definite multi-carrier peak-clipping coefficient by multi-carrier power estimation and/or multicarrier weights.Specifically, determine that the multi-carrier peak-clipping coefficient comprises the steps:
(1) multi-carrier power is estimated
The power that calculates each carrier wave by base band multicarrier baseband signal obtains the performance number of intercarrier.According to above-mentioned performance number, the power proportions pass that obtains each carrier wave is p
1: p
2: ...: p
K
(2) the multicarrier weights calculate
Because the antijamming capability difference of the signal of different modulating mode.3GPP TS 25.105 given EVM require as shown in table 1:
Table 1
| Modulation system | EVM |
| QPSK(EVM 1) | 17.5％ |
| 16QAM(EVM 2) | 12.5％ |
| 64QAM(EVM 3) | 8％ |
As shown in Table 1, EVM
1: EVM
2: EVM
3=2.1875: 1.5625: 1.Suppose that the modulation system that every road carrier signal adopts is M
k(k=1 ... K), wherein M is an order of modulation.
During M=2, modulation system is QPSK; The M=4 modulation system is 16QAM; During M=6, modulation system is 64QAM.Determine the weights of carrier wave to comprise following dual mode according to the modulation system of carrying signal on each carrier wave:
(1) carrying signal has only a kind of modulation system on carrier wave, and then each carrier wave weights computing formula is as follows:
That is, when modulation system is QPSK, q
k=2.1875; When modulation system is 16QAM, q
k=1.5625; When modulation system is 64QAM, q
k=1.
(2) when carrier data includes multiple modulation system, q
kChoose the weights of the high-order modulating correspondence of signal in this carrier wave.Can guarantee the EVM performance of high order modulation thus.
According to the multicarrier weights that obtain in the above-mentioned steps, the weights ratio that obtains each carrier wave is q
1: q
2: ...: q
K
Closing according to the power proportions of each carrier wave in above-mentioned multi-carrier power estimation and the calculating of multicarrier weights is p
1: p
2: ...: p
K, the weights ratio of each carrier wave is q
1: q
2: ...: q
K, the gain g of each carrier wave of calculating multicarrier
k, g
k=p
kq
k, k=1 wherein ... K.
Preferably, the gain g of each carrier wave
kCan also estimate p by multi-carrier power
KOr the weights q of multicarrier
KOne of obtain.
Work as q
k=1 o'clock, g
kEstimate p by multi-carrier power
KWhen calculating, i.e. g
k=p
k
Work as p
K=1 o'clock, g
kEstimate q by multi-carrier power
KWhen calculating, i.e. g
k=q
K
Obtain the gain g of each carrier wave by the way
k, also belong to protection scope of the present invention.
For the multicarrier configuration, design a prototype filter b (n), this prototype filter and single spectrum of carrier coupling.According to the carrier frequency configuration, the frequency domain of prototype filter is moved on the center frequency point of each carrier wave, then each the carrier gains value g that obtains according to the multicarrier gain regulation module
k, adjust every carrier gains, addition obtains multi-carrier peak-clipping filter h (n), promptly
Wherein, N is the length of peak clipping filter h (n).
Above-mentioned h (n) according to maximum normalization, is obtained multi-carrier peak-clipping coefficient h ' (n),
h′(n)＝h(n)/max(abs(h))，
Wherein, abs is for asking absolute value, and max () asks vectorial maximum, h=h (1) ..., h (N).
With a (i that obtains in multi-carrier peak-clipping coefficient h ' (n) and the step 102
Max) multiplying each other obtains the pulse vector that is used to offset.The above-mentioned vectorial y (i) that subtracts each other after obtaining upgrading with multi-transceiver combination data y (i) of pulse that obtains is the signal after the peak clipping,
y(i)＝y(i)-a(i
max)·h′(j)，
i∈[i
max-floor(N/2)，i
max+floor(N/2)]，j＝imod[i
max-floor(N/2)]。
In conjunction with Fig. 2 as can be known, the multi-transceiver combination data y (i) before the renewal is the signal after the multi-transceiver combination signal process time-delay that generates in the step 101.By above-mentioned time-delay process, the multi-transceiver combination data y (i) before guaranteeing the pulse vector and upgrading is synchronous.
Y (i) according to after upgrading makes i=i
2+ 1, repeating step 102 and step 103 stop after i is greater than the data number then.
In the present embodiment, all be removed, adopt the mode of multi-stage iteration to carry out adaptive peak clipping usually for guaranteeing all peak values.Promptly all peak points of the signal of exporting after iteration self-adapting peak clipping repeatedly are less than peak value detection threshold A
1The time stop the iteration self-adapting peak clipping.
Preferably, the signal of exporting after the peak clipping is carried out digital pre-distortion, can improve the linear characteristic of power amplification efficiency and power amplifier, reduce the caloric value of base station.
The method of the adaptive peak clipping that the embodiment of the invention provides, the difference of taking all factors into consideration multi-carrier power is different without the antijamming capability of the carrier wave of modulation system with employing, the EVM deterioration problem when having solved the emission of multicarrier compound modulation and unequal power.Under the condition that satisfies EVM and ACLR requirement, under the high order modulation pattern, can obtain better peak clipping effect simultaneously, make that the multi-transceiver combination signal after the peak clipping has more low peak average ratio, reduce the power amplifier cost greatly.
The embodiment of the invention also provides a kind of adaptive peak clipping device of multicarrier system, and in conjunction with shown in Figure 3, this device 300 comprises receiver module 310, peak value adjusting module 320 and peak-clipping module 330.
Wherein, receiver module 310 is used to receive the multi-transceiver combination signal of multicarrier system.
Specifically, in conjunction with shown in Figure 2, receiver module 310 adopt Digital Up Converts to signal modulate, spread spectrum and Filtering Processing, obtain each road carrier signal.Above-mentioned each road carrier signal is superposeed, obtain the multi-transceiver combination signal.Receiver module 310 receives the multi-transceiver combination signal of above-mentioned multicarrier system.
Above-mentioned multi-transceiver combination signal can be expressed as:
Wherein, x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number.
In conjunction with shown in Figure 2, peak value adjusting module 320 is found out peak value window with above-mentioned multi-transceiver combination signal by peak detection block.Peak value adjusting module 320 is used for multi-transceiver combination signal and peak value detection threshold are compared, and will carry out the peak value adjustment above the signal of peak value detection threshold.
Specifically, peak value adjusting module 320 is according to multi-transceiver combination signal y (i) and peak value detection threshold A
1, find out peak value window, promptly | y (i) |＞A
1, i ∈ [i
1, i
2], wherein,
x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number.
Pass through following formula | y (i) |＞A
1, i ∈ [i
1, i
2] as can be known, if all samples all below target gate, transmit y (i), algorithm finishes.Otherwise, in peak value window, find the peak-peak position at i
Max, the peak point data are y (i
Max).
Peak value adjusting module 320 will carry out the peak value adjustment above the signal of peak value detection threshold, calculate maximal peak point y (i
Max) and the peak clipping threshold value A
2Difference,
a(i
max)＝y(i
max)-A
2?exp(j*angle(y(i
max)))，
Guarantee difference a (i
Max) amplitude and phase place and peak point remain unchanged.
Wherein, peak value detection threshold A
1Generally to be higher than the peak clipping threshold value A slightly
2, i.e. A
1〉=A
2
Adaptive peak clipping device 300 also comprises peak-clipping module 330, is used for determining the multi-carrier peak-clipping coefficient, and the adjusted multi-transceiver combination signal of peak value is carried out adaptive peak clipping according to the multi-carrier peak-clipping coefficient.
Before adjusted multi-transceiver combination signal carried out adaptive peak clipping to peak value, peak-clipping module 330 at first will be determined the multi-carrier peak-clipping coefficient.In the present embodiment, peak-clipping module 330 is estimated by multi-carrier power and/or the definite multi-carrier peak-clipping coefficient of multicarrier weights calculating.Specifically, determine that the multi-carrier peak-clipping coefficient comprises the steps:
(1) multi-carrier power is estimated
The power that calculates each carrier wave by base band multicarrier baseband signal obtains the performance number of intercarrier.According to above-mentioned performance number, the power proportions pass that obtains each carrier wave is p
1: p
2: ...: p
K
(2) the multicarrier weights calculate
Because the antijamming capability difference of the signal of different modulating mode.3GPP TS 25.105 given EVM require as shown in table 1.
As shown in Table 1, EVM
1: EVM
2: EVM
3=2.1875: 1.5625: 1.Suppose that the modulation system that every road carrier signal adopts is M
k(k=1 ... K), wherein M is an order of modulation.
During M=2, modulation system is QPSK; The M=4 modulation system is 16QAM; During M=6, modulation system is 64QAM.Determine the weights of carrier wave to comprise following dual mode according to the modulation system of carrying signal on each carrier wave:
(1) carrying signal has only a kind of modulation system on carrier wave, and then each carrier wave weights computing formula is as follows:
That is, when modulation system is QPSK, q
k=2.1875; When modulation system is 16QAM, q
k=1.5625; When modulation system is 64QAM, q
k=1.
(2) when carrier data includes multiple modulation system, q
kChoose the weights of the high-order modulating correspondence of signal in this carrier wave.Can guarantee the EVM performance of high order modulation thus.
Peak-clipping module 330 is according to the multicarrier weights that obtain in the above-mentioned steps, and the weights ratio that obtains each carrier wave is q
1: q
2: ...: q
K
Closing according to the power proportions of each carrier wave in above-mentioned multi-carrier power estimation and the calculating of multicarrier weights is p
1: p
2: ...: p
K, the weights ratio of each carrier wave is q
1: q
2: ...: q
K, peak-clipping module 330 calculates the gain g of each carrier wave of multicarrier
k, g
k=p
kq
k, k=1 wherein ... K.
Preferably, the gain g of each carrier wave
kCan also estimate p by multi-carrier power
KOr the weights q of multicarrier
KOne of obtain.
Work as q
K=1 o'clock, g
kEstimate p by multi-carrier power
KWhen calculating, i.e. g
k=p
k
Work as p
K=1 o'clock, g
kEstimate q by multi-carrier power
KWhen calculating, i.e. g
k=q
K
Obtain the gain g of each carrier wave by the way
k, also belong to protection scope of the present invention.
For the multicarrier configuration, peak-clipping module 330 design prototype filter b (n), this prototype filter and single spectrum of carrier coupling.According to the carrier frequency configuration, the frequency domain of prototype filter is moved on the center frequency point of each carrier wave, then each the carrier gains value g that obtains according to the multicarrier gain regulation module
k, adjust every carrier gains, addition obtains multi-carrier peak-clipping filter h (n), promptly
Wherein, N is the length of peak clipping filter h (n).
Above-mentioned h (n) according to maximum normalization, is obtained multi-carrier peak-clipping coefficient h ' (n),
h′(n)＝h(n)/max(abs(h))，
Wherein, abs is for asking absolute value, and max () asks vectorial maximum, h=h (1) ..., h (N).
Peak-clipping module 330 with the multi-carrier peak-clipping coefficient h ' with peak value adjusting module 320 in a (i that obtains
Max) multiplying each other obtains the pulse vector that is used to offset.The above-mentioned vectorial y (i) that subtracts each other after obtaining upgrading with multi-transceiver combination data y (i) of pulse that obtains is the signal after the peak clipping,
y(i)＝y(i)-a(i
max)·h′(j)，
i∈[i
max-floor(N/2)，i
max+floor(N/2)]，j＝imod[i
max-floor(N/2)]。
In conjunction with Fig. 2 as can be known, the multi-transceiver combination data y (i) before the renewal is the signal after the multi-transceiver combination signal process time-delay that receives in the receiver module 310.By above-mentioned time-delay process, the multi-transceiver combination data y (i) before guaranteeing the pulse vector and upgrading is synchronous.
Peak-clipping module 330 makes i=i according to the y (i) after upgrading
2+ 1, above-mentioned then module repeats above-mentioned peak clipping operation, stops after i is greater than the data number.
In the present embodiment, peak-clipping module 330 adopts the mode of multi-stage iteration to carry out adaptive peak clipping for guaranteeing that all peak values all are removed usually.Promptly all peak points of the signal of exporting after iteration self-adapting peak clipping repeatedly are less than peak value detection threshold A
1The time stop the iteration self-adapting peak clipping.
Preferably, the signal of exporting after the peak clipping is carried out digital pre-distortion, can improve the linear characteristic of power amplification efficiency and power amplifier, reduce the caloric value of base station.
The adaptive peak clipping device that the embodiment of the invention provides, the difference of taking all factors into consideration multi-carrier power is different without the antijamming capability of the carrier wave of modulation system with employing, the EVM deterioration problem when having solved the emission of multicarrier compound modulation and unequal power.Under the condition that satisfies EVM and ACLR requirement, under the high order modulation pattern, can obtain better peak clipping effect simultaneously, make that the multi-transceiver combination signal after the peak clipping has more low peak average ratio, reduce the power amplifier cost greatly.
With TD-SCDMA system example, self-adapting peak-clipping method and device that the embodiment of the invention provides are described among Fig. 4～Fig. 8, the performance when considering the EVM of intercarrier power and different modulating mode.
Just consider intercarrier power below respectively and consider that the carrier modulation mode describes.
(1) considers intercarrier power.
For 12 carrier waves, 8 user data source, modulation system is QPSK, and the peak clipping thresholding is 6.8dB.Its 1st carrier power is than the low 12db of other carrier waves.The frequency spectrum of the signal when Fig. 4 shows not peak clipping, abscissa are the frequency of primary signal, and unit is MHz; Ordinate is the power of primary signal, and unit is dB.
Fig. 5 shows peak clipping front and back signal peak-to-average ratio CCDF (Complementary CumulativeDistribution Function, complementary cumulative distribution function) comparison diagram.In Fig. 5, abscissa is PAR (peak-to-average ratio, a peak-to-average force ratio), and unit is dB; Ordinate is that contrary accumulated probability distributes (CCDF), and unit is %.In Fig. 5, the power before black circle ". " the expression peak clipping, wherein the maximum input of signal PAR is 9.8049; At probability is 10
-4Under peak-to-average force ratio be 9.3521.Soft dot "." power of expression after the peak clipping, wherein the maximum input of peak clipping PAR is 6.9268; At probability is 10
-4Under peak-to-average force ratio be 6.9254.Table 2 is two kinds of EVM performance comparison under the different peak clipping modes.
Table 2
| Carrier number | Deng gain PC-CFR EVM[%] | Consider power, PC-CFR EVM[%] |
| 1 | 13.971 | 5.103 |
| 2 | 4.518 | 4.663 |
| 3 | 4.615 | 4.791 |
| 4 | 4.521 | 4.684 |
| 5 | 4.476 | 4.635 |
| 6 | 4.33 | 4.492 |
| 7 | 4.418 | 4.583 |
| 8 | 4.298 | 4.462 |
| 9 | 4.406 | 4.573 |
| 10 | 4.404 | 4.585 |
| 11 | 4.337 | 4.502 |
| 12 | 4.351 | 4.514 |
As can be seen from Table 2, when waiting gain PC-CFR peak clipping, No. 1 carrier wave is because power is less, and mis-behave is bigger after the peak clipping, reaches 13.9%.And when considering carrier power, No. 1 carrier wave EVM is 5.1%.By relatively can finding, when considering carrier power after the peak clipping performance improvement a lot, other carrier waves EVM only has small deterioration.
(2) consider the carrier modulation mode.
For 12 carrier waves, the carrier wave constant power.Table 3 is two kinds of EVM performance comparison under the different peak clipping modes.As shown in table 3, carrier number is that 1～4 carrier modulation mode is 64QAM, and carrier number is that 5～8 carrier modulation mode is 16QAM, and carrier number is that 9～12 carrier modulation mode is QPSK, and SF=1, peak clipping thresholding are 6.0dB.The frequency spectrum of the signal when Fig. 6 is not peak clipping, abscissa are the frequency of primary signal, and unit is MHz; Ordinate is the power of primary signal, and unit is dB.
Fig. 7 is signal peak-to-average ratio CCDF comparison diagram before and after the peak clipping.In Fig. 7, abscissa is PAR, and unit is dB; Ordinate is that contrary accumulated probability distributes (CCDF), and unit is %.In Fig. 7, the power before black circle ". " the expression peak clipping, wherein the maximum input of signal PAR is 10.0604; At probability is 10
-4Under peak-to-average force ratio be 9.4192.Soft dot "." power of expression after the peak clipping, wherein the maximum input of peak clipping PAR is 6.1851; At probability is 10
-4Under peak-to-average force ratio be 6.001.
Fig. 8 is the spectrogram of peak clipping filter, and abscissa is the frequency of primary signal, and unit is MHz; Ordinate is the power of primary signal, and unit is dB.
Table 3 is two kinds of EVM performance comparison under the different peak clipping modes.
Table 3
As can be seen from Table 3, when peak-to-average force ratio is cut to 6dB, adopt and wait each carrier wave EVM performance of gain PC-CFR scheme approaching.And consider modulation system PC-CFR scheme because the carrier wave of high-order modulating is had less peak clipping weights, so the peak clipping degree is lighter, EVM compares and waits the PC-CFR scheme better performances that gains.For the carrier wave of low-order-modulated mode, it is less better that EVM such as compares at gain PC-CFR scheme.For waiting gain PC-CFR, the 1st, the view requirement of No. 4 just discontented football associations of carrier wave, and each the carrier wave EVM of method that considers modulation system PC-CFR satisfies protocol requirement, considers that therefore the antijamming capability difference of modulation system can further reduce peak-to-average force ratio under the prerequisite that guarantees the EVM protocol requirement.
Because carrier power and modulation system can change along with the factors such as continuous variation of channel circumstance, self-adapting peak-clipping method that the embodiment of the invention provides and device can come self adaptation to adjust peak clipping filter gain value according to current carrier power and modulation system, reach than low peak average ratio, guarantee the EVM performance of carrier wave under the various modulation systems simultaneously.
The self-adapting peak-clipping method and the device that provide by the embodiment of the invention, the difference of taking all factors into consideration multi-carrier power is different without the antijamming capability of the carrier wave of modulation system with employing, the EVM deterioration problem when having solved the emission of multicarrier compound modulation and unequal power.Under the condition that satisfies EVM and ACLR requirement, under the high order modulation pattern, can obtain better peak clipping effect simultaneously, make that the multi-transceiver combination signal after the peak clipping has more low peak average ratio, reduce the power amplifier cost greatly.
One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. the self-adapting peak-clipping method of a multicarrier system is characterized in that, may further comprise the steps:
Receive the multi-transceiver combination signal of multicarrier system;
Described multi-transceiver combination signal and peak value detection threshold are compared, will carry out the peak value adjustment, obtain the peak value adjustment amount above the signal of peak value detection threshold;
Determine the multi-carrier peak-clipping coefficient, described multi-transceiver combination signal is carried out adaptive peak clipping according to described multi-carrier peak-clipping coefficient and peak value adjustment amount.
2. the self-adapting peak-clipping method of multicarrier system as claimed in claim 1 is characterized in that, will carry out the peak value adjustment above the signal of peak value detection threshold and comprise:
According to multi-transceiver combination signal y (i) and peak value detection threshold A
1, find out peak value window, promptly | y (i) |＞A
1, i ∈ [i
1, i
2], wherein,
x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number;
Carry out the peak value adjustment, calculate maximal peak point and peak clipping threshold value A
2Difference, make the amplitude of difference and phase place and peak point remain unchanged a (i
Max)=y (i
Max)-A
2Exp (j*angle (y (i
Max))), A wherein
1〉=A
2
3. the self-adapting peak-clipping method of multicarrier system as claimed in claim 2 is characterized in that, determines that the multi-carrier peak-clipping coefficient comprises: estimate and/or the definite multi-carrier peak-clipping coefficient of multicarrier weights calculating according to multi-carrier power.
4. the self-adapting peak-clipping method of multicarrier system as claimed in claim 3 is characterized in that, determines that the multi-carrier peak-clipping coefficient comprises:
Calculate the gain g of each carrier wave of multicarrier
k=p
kq
k, wherein, it is p that the power proportions of each carrier wave is closed
1: p
2: ...: p
K, the weights ratio of each carrier wave is q
1: q
2: ...: q
K
Design a prototype filter b (n), described prototype filter and single spectrum of carrier coupling are according to the carrier frequency configuration, on the center frequency point of moving each carrier wave of prototype filter frequency domain, according to multicarrier gain g
k=p
kq
kAdjust every carrier gains, addition obtains multi-carrier peak-clipping filter h (n),
5. the self-adapting peak-clipping method of multicarrier system as claimed in claim 4 is characterized in that, the adjusted described multi-transceiver combination signal of peak value is carried out adaptive peak clipping according to described multi-carrier peak-clipping coefficient, peak value adjustment amount comprise:
With a (i
Max) obtaining the pulse vector that is used to offset with the h multiplication of vectors, the y (i) that subtracts each other after obtaining upgrading with multi-transceiver combination data y (i) is the signal after the peak clipping then,
y(i)＝y(i)-a(i
max)·h′(j)，i∈[i
max-floor(N/2)，i
max+floor(N/2)]，
J=i mod[i
Max-floor (N/2)], h ' (n)=h (n)/max (abs (h)), wherein, floor is for to round under the data, abs is for asking absolute value, max () asks vectorial maximum.
6. the self-adapting peak-clipping method of multicarrier system as claimed in claim 5, it is characterized in that, described multi-transceiver combination signal y (i) is carried out the multi-stage iteration adaptive peak clipping, and all peak points of the signal of exporting after iteration self-adapting peak clipping repeatedly are less than peak value detection threshold A
1The time stop the iteration self-adapting peak clipping.
7. the adaptive peak clipping device of a multicarrier system is characterized in that, comprises receiver module, peak value adjusting module and peak-clipping module,
Described receiver module is used to receive the multi-transceiver combination signal of multicarrier system;
Described peak value adjusting module is used for described multi-transceiver combination signal and peak value detection threshold are compared, and will carry out the peak value adjustment above the signal of peak value detection threshold, obtains the peak value adjustment amount;
Described peak-clipping module is used for determining the multi-carrier peak-clipping coefficient, and described multi-transceiver combination signal is carried out adaptive peak clipping according to described multi-carrier peak-clipping coefficient, peak value adjustment amount.
8. the adaptive peak clipping device of multicarrier system as claimed in claim 7 is characterized in that, described peak value adjusting module will carry out the peak value adjustment and comprise above the signal of peak value detection threshold:
Described peak value adjusting module is according to multi-transceiver combination signal y (i) and peak value detection threshold A
1, find out peak value window, promptly | y (i) |＞A
1, i ∈ [i
1, i
2], wherein,
x
k(i) be k the carrier signal that obtains through ovennodulation, spread spectrum and Filtering Processing, K is total carrier number, f
kBe the k carrier frequency point, f
sBe the digital intermediate frequency sample frequency, T is the data number;
Described peak value adjusting module carries out the peak value adjustment, calculates maximal peak point and peak clipping threshold value A
2Difference, make the amplitude of difference and phase place and peak point remain unchanged a (i
Max)=y (i
Max)-A
2Exp (j*angle (y (i
Max))), A wherein
1〉=A
2
9. the adaptive peak clipping device of multicarrier system as claimed in claim 8, it is characterized in that described peak-clipping module determines that the multi-carrier peak-clipping coefficient comprises: described peak-clipping module is estimated according to multi-carrier power and/or the multicarrier weights calculate definite multi-carrier peak-clipping coefficient.
10. the adaptive peak clipping device of multicarrier system as claimed in claim 9 is characterized in that, described peak-clipping module determines that the multi-carrier peak-clipping coefficient comprises:
Calculate the gain g of each carrier wave of multicarrier
k=p
kq
k, wherein, it is p that the power proportions of each carrier wave is closed
1: p
2: ...: p
K, the weights ratio of each carrier wave is q
1: q
2: ...: q
K
Design a prototype filter b (n), described prototype filter and single spectrum of carrier coupling are according to the carrier frequency configuration, on the center frequency point of moving each carrier wave of prototype filter frequency domain, according to multicarrier gain g
k=p
kq
kAdjust every carrier gains, addition obtains multi-carrier peak-clipping filter h (n),
11. the adaptive peak clipping device of multicarrier system as claimed in claim 10 is characterized in that, described peak-clipping module carries out adaptive peak clipping to the adjusted described multi-transceiver combination signal of peak value according to described multi-carrier peak-clipping coefficient, peak value adjustment amount and comprises:
Described peak-clipping module is with a (i
Max) obtaining the pulse vector that is used to offset with the h multiplication of vectors, the y (i) that subtracts each other after obtaining upgrading with multi-transceiver combination data y (i) is the signal after the peak clipping then,
y(i)＝y(i)-a(i
max)·h′(j)，i∈[i
max-floor(N/2)，i
max+floor(N/2)]，
j＝i?mod[i
max-floor(N/2)]，h′(n)＝h(n)/max(abs(h))，
Wherein, floor is that abs is for asking absolute value to rounding under the data, and max () asks vectorial maximum.
12. the adaptive peak clipping device of multicarrier system as claimed in claim 11, it is characterized in that, described peak-clipping module carries out the multi-stage iteration adaptive peak clipping to described multi-transceiver combination signal y (i), and all peak points of the signal of exporting after iteration self-adapting peak clipping repeatedly are less than peak value detection threshold A
1The time stop the iteration self-adapting peak clipping.
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