CN101136890B - Optimized multi-carrier signal slicing device and method therefor - Google Patents
Optimized multi-carrier signal slicing device and method therefor Download PDFInfo
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Abstract
The device includes following units: peak coefficient generation unit in use for picking-up peak pulse from the input signal in multicarrier joined route (ISMJR) in order to obtain peak coefficient factor (PCF) corresponding to peak pulse; clipping coefficient (CC) generation unit in use for processing PCF to obtain CC corresponding to peak pulse; being connected to CC generation unit, clipper unit in use for carrying out weighting process based on CC for time-delay processed ISMJR so as to form clipping signal; being connected to the clipper unit, cancellation pulse generation unit (CPGU) in use for processing ISMJR and the clipping signal to form signal of cancellation pulse; being connected to CPGU, peak pulse cancellation unit in use for synthesizing time-delay processed clipping signal and signal of cancellation pulse so as to generate clipped output signal in multicarrier joined route. The invention saves resources and raises output efficiency of power amplification.
Description
Technical field
The present invention relates to the signal processing apparatus and the method in digital mobile communication field, particularly relate to a kind of multi-carrier signal clipping device and method thereof that reduces the multi-carrier communications systems signal peak-to-average ratio.
Background technology
At present, wireless telecommunication system adopts higher BPSK (the Binary Phase Shift Key of the availability of frequency spectrum, binary phase shift keying), QPSK (Quadrature Phase Shift Key, Quadrature Phase Shift Keying), 8QAM (8Quadrature Amplitude Modulation, 8 quadrature amplitude modulation), 16QAM (16QuadratureAmplitude Modulation, 16 quadrature amplitude modulation) modulation system such as, these modulation systems are not only modulated the phase place of carrier wave, also the amplitude of carrier wave is modulated, these modulation systems can produce the non-permanent envelope modulated signal of big peak-to-average force ratio, the signal of these big peak-to-average force ratios can make some semiconductor device of power amplifier be operated in nonlinear area, will produce serious intermodulation component like this, in band, can cause the interference between signal, outside band, can produce serious spectral re-growth, the band external system is produced interference, though can solve this problem by the rollback amount of regulating power amplifier 1dB compression point, but will reduce the power output of power amplifier so greatly, make efficiency of amplitude become very low, so be necessary to take corresponding techniques to reduce and be input to the signal peak-to-average ratio of power amplifier, reduce peak-to-average force ratio simultaneously and can also bring following benefit:
A) reduce system cost, present high-power pipe cost is higher, and slicing is to realize that at numeric field cost is lower;
B) combine with pre-distortion algorithms, can improve the degree of improvement of pre-distortion algorithms greatly the power amplifier linear index.Just be based at the clipping device of multi-carrier signal and method that these thoughts put forward.
Clipping method is to adopt suitable strategy to handle by the peak value to signal, reduce signal peak-to-average ratio CCDF (Complementary Cumulative Distribution Function thereby reach, CCDF), guarantee EVM (Error Vector Magnitude simultaneously, Error Vector Magnitude) and the deterioration of ACLR (Adjacent Channel Leakage Power Ratio, Adjacent Channel Leakage Power Ratio) index in allowed band.At present, the device and method of multicarrier slicing realization has following several:
(1) hard clipping adds filtering
The principle that hard clipping is realized is comparatively simple, mainly be that the signal that will handle is compared with the slicing thresholding, to be restricted on the slicing thresholding greater than the sampled point of slicing thresholding, the sampled point of this method affect is less, therefore can obtain more excellent EVM index, flex point can appear but this method can cause at the edge of peak pulse, thereby produce serious frequency spectrum diffusion, the inhibition of the spread spectrum of back is handled and is had bigger pressure like this, and this requires the filter of back that enough inhibition indexs will be arranged; On the other hand, the primary signal behind the slicing is added the recovery that filter may cause peak value, the slicing effect can variation like this.
(2) peak value window clipping method
Because flex point can appear in the realization of hard clipping method, these flex points can cause the serious diffusion of frequency spectrum, if can carry out smoothing processing to these flex points, just can significantly reduce band spuious generation outward, and peak value window clipping method just is based on that this thought puts forward.The realization principle of peak value window clipping method is earlier the peak value of signal to be searched for, carrying out relevant parameters according to peak value calculates, obtain one group of parameter A relevant with signal peak, again this group parameter A is carried out smoothing processing and (generally adopt FIR (Finite Impulse Response, finite impulse response (FIR)) filter is realized), obtain one group of B parameter, with B parameter and signal multiplication.Because the peak-to-average force ratio of single carrier is lower, single carrier is had slicing effect preferably, and it is higher for its peak-to-average force ratio of multi-carrier signal, in order to obtain certain slicing effect, the band of signal is outer spuious higher behind the slicing, and this smoothing filter that just requires parameter A is handled must have higher exponent number, can increase the expense of system resource so on the one hand, and it is high more to work as filter order, and the sampling number of influence is just many more, the bigger deterioration that will bring the EVM index; On the other hand, the probability that occurs continuous peak value for multicarrier in a period of time can be bigger, because the filter of higher exponent number may cause the situation that signal is repeated weighting, with peak value window method multi-carrier signal is being carried out the desirable slicing effect of the just impossible acquisition of slicing like this during the realization of peak value window clipping method.Though this situation at multicarrier can be alleviated by the peak value window clipping method of cascade, this need increase the more resources expense, and cost can corresponding raising.
(3) clipping method is offset in pulse
The thought that clipping method is based on the signal stack is offset in pulse, as long as it is opposite to produce a phase place at the peak pulse place, the proportional cancellation pulses of amplitude and peak value size just can have slicing effect preferably, and the key that this method realizes is the estimation of extraction, peak pulse amplitude and the position of peak value offset pulse.The advantage of pulse counteracting method is, only need carry out forming processes to the frequency spectrum of cancellation pulses, make its spectral characteristic have the stopband identical and suppress, need not primary signal is carried out forming processes, can reduce deterioration so as far as possible the EVM index with original signal spectrum.
In China's number of applying for a patent is 03109876.2 patent of invention, a kind of multi-carrier signal clipping method has been proposed, this method is based on the clipping method that pulse is offset, its method that produces cancellation pulses is based on the method for hard-limiting, this method will obtain better peak-to-average force ratio effect can cause serious frequency spectrum diffusion effect, design for the filter coefficient in the broadband noise processing unit thereafter brings bigger pressure like this, needs more resources to go to realize so will obtain better peak-to-average force ratio index under the linear index that meets the demands.
In Chinese patents number is that 200510082955.7 patent of invention has proposed a kind of multi-carrier signal clipping device and method that adopts preconditioning technique, this patent is the method for twice slicing of usefulness, at first, carry out pre-slicing processing to receiving each sub-carrier signal, secondly, after signal closed the road behind the slicing, signal had carried out slicing behind the involutory again road, and what twice slicing adopted all is the hard clipping method.Although carrying out slicing at different carrier power, this patent handles, to the more weak carrier signal EVM of power less influence can be arranged like this, but need carrying out twice slicing processing usually, this processing structure could obtain comparatively ideal peak-to-average force ratio index, this scheme implementation structure more complicated, need more hardware resource could obtain slicing effect preferably, simultaneously, adopt the method for hard clipping, can cause serious frequency spectrum diffusion effect, like this under the prerequisite that satisfies certain linearity index to slicing after Signal Processing (Design of Filter) bring bigger pressure.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of multi-carrier signal clipping device and method thereof of optimization, is used to be implemented under the prerequisite that satisfies system performance index obtain desirable slicing effect with the least possible hardware resource.
To achieve these goals, the invention provides a kind of multi-carrier signal clipping device of optimization, it is characterized in that, comprising:
One peak factor generation unit is used for input multi-transceiver combination signal is handled the extraction peak pulse, obtains the peak factor factor corresponding to described peak pulse;
One clipping factor generation unit connects described peak factor generation unit, is used for the described peak factor factor is handled the clipping factor of acquisition corresponding to described peak pulse;
One peak clipper unit connects described clipping factor generation unit, is used for being weighted processing according to the input multi-transceiver combination signal of described clipping factor after to delay process, forms clipped signal;
One cancellation pulses generation unit connects described peak clipper unit, is used for described input multi-transceiver combination signal, described clipped signal are handled generation cancellation pulses signal;
One peak pulse offset unit connects described cancellation pulses generation unit, is used for described clipped signal after the delay process and described cancellation pulses signal are synthesized the multi-transceiver combination output signal behind the generation slicing.
The multi-carrier signal clipping device of described optimization, wherein, described peak factor generation unit comprises again:
One quadratic sum unit is used to obtain the instantaneous power value of described input multi-transceiver combination signal;
One peak search element is used for from described input multi-transceiver combination signal extraction peak pulse, handles the positional information of extracting described peak pulse by described instantaneous power value being carried out logical operation; And
One coefficient extraction unit, be used for obtaining the peak factor factor corresponding with described peak pulse according to described positional information, determine the corresponding weighted factor of each sampled point signal with described input multi-transceiver combination signal, it is realized by look-up table mode or multiplier unit, when realizing in the look-up table mode, as the address, the content of look-up table is the weighted factor of each sampled point correspondence with described instantaneous power value in the input of look-up table.
The multi-carrier signal clipping device of described optimization, wherein, described clipping factor generation unit comprises again:
One peak factor expanding element is used to produce a coefficient square wave corresponding to the described peak factor factor, and it is realized by a multistage multiplier architecture or be made up of a multistage multiplier and first in first out sequence, reaches
One clipping factor extraction unit, be used for described coefficient square wave is carried out smoothing processing, generate clipping factor, it is made of a low pass filter, and the exponent number of this low pass filter is less than the ratio of the spreading rate of data sampling speed and handled input multi-transceiver combination signal.
The multi-carrier signal clipping device of described optimization, wherein, described peak clipper unit comprises again:
One delay unit is used for that described input multi-transceiver combination signal is carried out time delay with described clipping factor and aligns; And
One multiplier unit is used for multi-transceiver combination signal after described delay unit delay process and described clipping factor are multiplied each other, and multiplied result is exported as clipped signal.
The multi-carrier signal clipping device of described optimization, wherein, described cancellation pulses generation unit comprises again:
One delay unit is used for that the time delay of described input multi-transceiver combination signal is carried out time delay with described clipped signal and aligns;
One subtrator is used for the signal subtraction of described clipped signal and the output of described delay unit is extracted the cancellation pulses signal; And
One pulse-shaping filter is used for that described cancellation pulses signal is carried out the moulding Filtering Processing and generates filtered cancellation pulses signal, this formed filter be one with the low pass filter of described input multi-transceiver combination signal same frequency spectrum characteristic.
The multi-carrier signal clipping device of described optimization, wherein, described peak pulse offset unit comprises again:
One delay unit is used for described clipped signal being delayed time and carrying out time delay with described cancellation pulses signal and align; And
One subtractor unit is used for clipped signal and described cancellation pulses signal after described delay unit time delay alignment being synthesized the multi-transceiver combination signal behind the output slicing.
To achieve these goals, the invention provides a kind of multi-carrier signal clipping method of optimization, it is characterized in that, comprising:
Step 71 is handled the extraction peak pulse to input multi-transceiver combination signal, obtains the peak factor factor corresponding to described peak pulse;
Step 72 is handled the clipping factor that obtains corresponding to described peak pulse to the described peak factor factor;
Step 73 is weighted processing according to described clipping factor to the described input multi-transceiver combination signal after postpone handling, and generates clipped signal;
Step 74 utilizes described clipped signal to produce the cancellation pulses signal in conjunction with described input multi-transceiver combination signal; And
Step 75 is synthesized described clipped signal after the delay process and described cancellation pulses signal, the multi-transceiver combination output signal behind the generation slicing.
The multi-carrier signal clipping method of described optimization, wherein, described step 71 comprises again:
Step 711 is calculated the instantaneous power value of described each sampled point of input multi-transceiver combination signal;
Step 712 is extracted the corresponding slicing factor to each sampled point greater than the slicing thresholding, and less than each sampled point of slicing thresholding, its corresponding slicing factor is made as 1;
Step 713, according to the magnitude relationship of the instantaneous power value of continuous four sampled point A, B, C, D and the position that described slicing thresholding is determined peak pulse, as logical relation B＞A and C＞D, and the maximum of B and C obtains the positional information of peak pulse during greater than described slicing thresholding;
Step 714 is exported as the peak factor factor with the slicing factor that the maximum sampled point at described peak pulse place obtains.
The multi-carrier signal clipping method of described optimization, wherein, described step 72 comprises again:
Step 721 is carried out extension process to the described peak factor factor, forms range value and the equal-sized coefficient square wave of the described peak factor factor; And
Step 722 is carried out smoothing processing to described coefficient square wave, obtains the clipping factor corresponding to described peak pulse;
The duration of described coefficient square wave is decided according to the exponent number that carries out the filter of described smoothing processing.
The multi-carrier signal clipping method of described optimization, wherein, described 74 comprise again:
Step 741, the input multi-transceiver combination signal after utilizing described clipped signal in conjunction with delay process produces the cancellation pulses signal; And
Step 742 is carried out the moulding Filtering Processing to described cancellation pulses signal, generates filtered cancellation pulses signal.
The present invention proposes a kind of the employing and carry out slicing based on the pulse canceller and the method for peak value window at the multi-transceiver combination signal, adopt the clipping method of peak value window can reduce the serious frequency spectrum diffusion that the hard clipping method is caused greatly, on the one hand, can reduce the resource requirement required to the follow-up signal Treatment Design; On the other hand, also can when obtaining better slicing effect, reduce deterioration to EVM and ACLR index as far as possible.
Adopt the method for the invention and device, compare with the clipping method of existing hard-limiting, employing can obtain the slicing effect of more optimizing to the scheme that clipping factor carries out the filtering smoothing processing under the prerequisite that satisfies same linearisation index; The hardware implementation structure of this method is simple simultaneously, has saved resource, has further improved the delivery efficiency of power amplifier, has reduced the cost of power amplifier.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is multicarrier clipping device position view in the WCDMA system of a kind of optimization of the present invention;
Fig. 2 is the basic structure schematic diagram of the multicarrier clipping device of a kind of optimization of the present invention;
Fig. 3 is a kind of concrete structure schematic diagram of the multicarrier clipping device of a kind of optimization of the present invention;
Fig. 4 is the another kind of specific implementation structural representation of the temporal extension unit of the multicarrier clipping device of a kind of optimization of the present invention;
Fig. 5 handles before and CCDF curve chart afterwards through slicing of the present invention for the multi-transceiver combination signal;
Fig. 6 is the multi-carrier signal clipping method of a kind of optimization of the present invention.
Embodiment
The present invention is described in detail to be applied in specific embodiment in the WCDMA multicarrier system below in conjunction with accompanying drawing and the present invention.
See also shown in Figure 1ly, be the position view of multicarrier clipping device in the WCDMA system of a kind of optimization of the present invention.
The multicarrier clipping device of optimizing, it can be realized by the baseband portion that is arranged in system, also can be arranged in power amplification system.Usually when base band realized, base band provided the subcarrier input signal, then can increase corresponding module (as the carrier wave synthesis module) easily in numeric field, and each subcarrier input signal is merged into the multi-transceiver combination signal.If this device is arranged in power amplification system, the entry signal of power amplifier is a radiofrequency signal, then can obtain the intermediate frequency multi-transceiver combination signal of needs by corresponding frequency-conversion processing.
After the multi-transceiver combination signal is sent into digital down converter 11 processing, deliver to slicing module 4 again and carry out the slicing processing, the multi-transceiver combination signal of certain communication system index request is satisfied in output, carries out sending after distortion is handled through digital predistortion processor 12 again.
The realization of the multicarrier clipping device of optimizing mainly is to make balance between the CCDF of system requirements index, EVM index and the several indexs of ACLR.
See also shown in Figure 2ly, be the basic structure schematic diagram of the multicarrier clipping device of a kind of optimization of the present invention.The multicarrier peak clipper of optimizing 4 is made up of peak factor generation unit 40, clipping factor generation unit 50, peak clipper unit 60, cancellation pulses generation unit 70 and peak pulse offset unit 80.
Peak factor generation unit 40, be used for the multi-transceiver combination signal of input is carried out power detection and extracts peak pulse, obtain the slicing factor at peak point place, and with this slicing factor as peak factor factor output, it further comprises quadratic sum unit, peak search element and coefficient extraction unit.Wherein, the quadratic sum unit is used to calculate the instantaneous power of the multi-transceiver combination signal of input; Peak search element is used for extracting peak pulse from the multi-transceiver combination signal, handles the positional information that extracts peak pulse by the logical operation to a plurality of sampled point instantaneous powers; The coefficient extraction unit is used for generating according to positional information the peak factor factor of corresponding peak pulse, promptly determines the weighted factor of each sampled point signal correspondence of input, can utilize look-up tables'implementation, also can utilize multiplier unit to realize; When with look-up tables'implementation, the input of look-up table be with the instantaneous power value as index address, the content of look-up table is the weighted factor of the power points correspondence of each sampled point.
Clipping factor generation unit 50 is used to obtain the weighted factor corresponding to a plurality of sampled point correspondences of peak pulse, obtains the slicing weight coefficient; It comprises peak factor expanding element and clipping factor extraction unit again.Wherein, the peak factor expanding element is used to produce a coefficient square wave corresponding to the peak factor factor, this unit further can be realized by multistage multiplier architecture, also can be by multistage multiplier and FIFO (First InFirst Out, first in first out) forms, the clipping factor extraction unit is used for the coefficient square wave is carried out smoothing processing, acquisition is corresponding to the clipping factor of peak pulse, it is made of a low pass filter, the selection of this low pass filter exponent number is that the ratio with the spreading rate of data sampling speed and multi-transceiver combination signal is foundation, and the exponent number of this low pass filter is chosen and is less than this ratio value usually.
Cancellation pulses generation unit 70 is used for producing the cancellation pulses signal that spectral characteristic satisfies the linear index of communication system requirement with the clipped signal of peak clipper unit 60 outputs; Cancellation pulses generation unit 70 comprises delay unit again, subtrator and pulse-shaping filter, wherein, delay unit is used for that the time delay of the multi-transceiver combination signal of input is carried out time delay with the clipped signal of peak clipper unit 60 outputs and aligns, subtrator is used for the signal subtraction of the clipped signal of peak clipper unit 60 outputs and delay unit output is extracted the cancellation pulses signal, the pulse-shaping filter is used for the cancellation pulses signal of subtrator output is carried out molding filtration, this formed filter is a low pass filter, and its spectral characteristic has identical characteristic with the multi-transceiver combination signal of input.
Peak pulse offset unit 80 is used for the clipped signal of peak clipper unit 60 outputs and the cancellation pulses signal of cancellation pulses generation unit 70 generations are synthesized the multi-transceiver combination output signal behind the formation slicing.Peak pulse offset unit 80 comprises delay unit and subtractor unit again, wherein, delay unit is used for the clipped signal time-delay that peak clipper unit 60 is exported and carries out time delay with the cancellation pulses signal of cancellation pulses generation unit 70 outputs and align, and subtractor unit is used for the multi-transceiver combination output signal behind clipped signal after the time delay alignment and the synthetic generation of the cancellation pulses signal slicing.
See also shown in Figure 3, a kind of concrete structure schematic diagram for the multicarrier clipping device of a kind of optimization of the present invention, Fig. 4 is the another kind of specific implementation structural representation of the temporal extension unit of the multicarrier clipping device of a kind of optimization of the present invention, and Fig. 5 handles before and CCDF curve chart afterwards through slicing of the present invention for the multi-transceiver combination signal.
In conjunction with Fig. 2,4,5, the multicarrier peak clipper of optimizing among Fig. 34 is made up of peak factor generation unit 40, clipping factor generation unit 50, peak clipper unit 60, cancellation pulses generation unit 70 and peak pulse offset unit 80.
Peak factor generation unit 40 is used to produce the peak factor factor at peak pulse place, and it further comprises quadratic sum unit 401, coefficient extraction unit 402 and peak search element 403.Wherein, quadratic sum unit 401 is used to calculate the instantaneous power of the multi-transceiver combination signal of input; Coefficient extraction unit 402 is used for the weighted factor of each sampled point signal correspondence of definite input, can pass through look-up tables'implementation, also can realize by multiplier unit, when with look-up tables'implementation, it be the instantaneous power value calculated with quadratic sum unit 401 as index address, find out the weighted factor of each sampled point correspondence of signal; Peak search element 403 is called the peak value decision unit again, its instantaneous power value of utilizing quadratic sum unit 401 to calculate is carried out logical operation, per 4 sampled points are divided into one group, obtain the position of current peak pulse according to the logical relation between these 4 sampled points, this positional information is represented with a flag bit, when peak pulse occurred, it was logic ' 1 ' that this flag bit is set; Otherwise this flag bit is set is logic ' 0 '.This flag bit is used to control the selection output that comes from coefficient extraction unit 402 weighted factors.
If multi-transceiver combination I, the Q signal of input are I_data and Q_data, wherein I_data represents I road input signal, and Q_data represents Q road input signal, and then the instantaneous power of quadratic sum unit 401 calculating is expressed as formula (1):
P_in＝I_data*I_data+Q_data*Q_data (1)
The weighted factor and the Input Address of 402 outputs of coefficient extraction unit can obtain according to expression (2):
Wherein P_c is default slicing threshold value, and P_in is the instantaneous power value of input, and n is the quantization digit of weighted factor.
Above-mentioned condition can only obtain the positional information of current peak pulse, obtain the peak factor factor of current peak pulse correspondence, also need adjudicate according to following condition, be under 1 the condition at the flg flag bit, the coefficient value Coef1 that will work as coefficient Coef_curr 3 sampled point correspondences before of previous peaks place acquisition, Coef2 and Coef3 and 1 compare, only when Coef1 ≠ 1, when Coef2 ≠ 1 and Coef3 ≠ 1 three condition all satisfies, Coef_curr just exports as the peak factor factor at current peak pulse place, and the weight coefficient of other sampled point correspondence is output as 1.
Clipping factor generation unit 50 is used for the peak factor factor of peak factor generation unit 40 outputs is handled, and obtains clipping factor, and it further comprises peak factor expanding element 501 and low pass filter unit 502.Wherein, peak factor expanding element 501 is used for the peak factor factor with peak factor generation unit 40 output and is extended to and has the coefficient square wave that has identical exponent number with low pass filter unit 502, peak factor expanding element 501 can be realized by multiple structure, the simplest implementation structure is to be made of multiplier unit fully, concrete structure is shown in Fig. 4 structure, also can adopt another multiplier unit to add FIFO (First In First Out, first in first out) structure realizes that concrete structure as shown in Figure 5; The effect of low pass filter unit 502 is that the coefficient square wave is carried out smoothing processing, obtain clipping factor, it can control the out of band spectrum diffusion of signal after the weighting by the design of this filter order, in general, the coefficient filter exponent number is high more, then the inhibition to out of band spectrum has better effect, can reduce the design pressure of back cancellation pulses formed filter, but because the smearing of filter makes filter order high more, the sampled point that then influences non-peak pulse place is many more, can cause the severe exacerbation of EVM index so on the one hand, on the other hand, the length of delay unit also will extend, and can take more system resource like this.Therefore, in actual use, choosing of this coefficient filter exponent number should be design criterion with the ratio less than the spreading rate of data sampling speed and handled signal of communication.
Cancellation pulses generation unit 70 is used to produce the cancellation pulses signal, comprises subtractor unit 701 and low pass filter unit 702; Subtractor unit 701 is used to extract the cancellation pulses signal, low pass filter unit 702 is called the cancellation pulses formed filter again, be used for the cancellation pulses that subtractor unit 701 is extracted is carried out molding filtration, make the outer spuious inhibition requirement that communication system requires that has of band of filtered pulse signal frequency spectrum, the size of the out of band spectrum diffusion of the cancellation pulses that can extract according to subtractor unit 701 during specific design designs.
Peak pulse offset unit 80, the signal subtraction that I, Q two paths of signals and the cancellation pulses generation unit 70 that is used for that delay unit 100 is exported produces forms the multi-transceiver combination output signal that satisfies certain communication system index request.
See also shown in Figure 6ly, be the multi-carrier signal clipping method of a kind of optimization of the present invention.This method is realized by following step:
Step 601 is carried out peak extraction to the multi-transceiver combination signal, obtains the positional information and the amplitude information of peak pulse, according to the peak factor factor of amplitude information formation corresponding to peak pulse;
Step 602 is carried out extension process to the peak factor factor at peak pulse place, produces a coefficient square wave, and the coefficient square wave of expanding is carried out Filtering Processing, obtains clipping factor;
Step 603 is weighted processing with the clipping factor that obtains to the multi-transceiver combination signal after postponing, the multi-transceiver combination signal behind the acquisition slicing;
Step 604, utilize the multi-transceiver combination signal of the multi-transceiver combination signal combination input behind the slicing to produce pregenerated cancellation pulses signal, this pregenerated cancellation pulses signal is carried out molding filtration, and make the frequency spectrum stopband of the cancellation pulses behind the molding filtration have the inhibition degree that communication system requires;
Step 605, with the clipped signal after the delay of the cancellation pulses signal combination behind the spectral shaping, the multi-transceiver combination output signal behind the formation slicing.
In the present invention, step 601 can further comprise the following steps: again
(a1), calculate the instantaneous power of each sampled point of input multi-transceiver combination signal;
(a2), each sampled point greater than the slicing thresholding is extracted its pairing slicing factor, less than each sampled point of slicing thresholding, its slicing factor is made as 1;
(a3), determine the position of peak pulse according to the slicing thresholding of the magnitude relationship of the instantaneous power value of continuous 4 sampled point A, B, C, D and setting;
Judgment criterion: as logical relation B＞A and C＞D, and the maximum of B and C can obtain the positional information of peak pulse during greater than the slicing thresholding;
(a4), the slicing factor that obtains with the maximum sampled point at peak pulse place is exported as the peak factor factor.
In the present invention, step 602 can further comprise the following steps: again
(b1), the peak factor factor is expanded, formed a coefficient square wave that waits size, this coefficient square wave has following feature: the range value of this coefficient square wave equals the peak factor factor; The duration of this coefficient square wave is to be determined by back grade of filter order that carries out the processing of the peak factor factor;
(b2), the coefficient square wave is carried out smoothing processing, obtain clipping factor corresponding to peak pulse;
It is spuious littler than the out of band spectrum that hard-limiting slicing brings to utilize this clipping factor that the multi-transceiver combination signal is weighted the clipped signal of handling acquisition.
Step 604 of the present invention can further comprise the following steps: again
(d1), the clipped signal of utilizing step 603 to obtain produces the cancellation pulses signal in conjunction with the multi-transceiver combination signal after delaying time;
(d2), the cancellation pulses signal is carried out the moulding Filtering Processing, generate filtered cancellation pulses signal;
The frequency spectrum stopband of this formed filter has enough inhibition degree, to satisfy the stopband inhibition that communication system requires.
In the step 605 of the present invention, the cancellation pulses signal of exporting with step 604 after the clipped signal delay process of step 603 is carried out overlap-add procedure, the multi-transceiver combination output signal behind the acquisition slicing.
From technical scheme of the present invention, adopt the method for the invention and device, compare with the clipping method of existing hard-limiting, employing can obtain the slicing effect of more optimizing to the scheme that clipping factor carries out the filtering smoothing processing under the prerequisite that satisfies same linearisation index; The hardware implementation structure of this method is simple simultaneously, has saved resource, has further improved the delivery efficiency of power amplifier, has reduced the cost of power amplifier.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (4)
1. the multi-carrier signal clipping device of an optimization is characterized in that, comprising:
One peak factor generation unit is used for input multi-transceiver combination signal is handled the extraction peak pulse, obtains the peak factor factor corresponding to described peak pulse;
One clipping factor generation unit connects described peak factor generation unit, is used for the described peak factor factor is handled the clipping factor of acquisition corresponding to described peak pulse;
One peak clipper unit connects described clipping factor generation unit, is used for being weighted processing according to the input multi-transceiver combination signal of described clipping factor after to delay process, forms clipped signal;
One cancellation pulses generation unit connects described peak clipper unit, is used for described input multi-transceiver combination signal, described clipped signal are handled generation cancellation pulses signal;
One peak pulse offset unit connects described cancellation pulses generation unit, is used for described clipped signal after the delay process and described cancellation pulses signal are synthesized the multi-transceiver combination output signal behind the generation slicing;
Described peak factor generation unit comprises again:
One quadratic sum unit is used to obtain the instantaneous power value of described input multi-transceiver combination signal;
One peak search element is used for from described input multi-transceiver combination signal extraction peak pulse, handles the positional information of extracting described peak pulse by described instantaneous power value being carried out logical operation; And
One coefficient extraction unit, be used for obtaining the peak factor factor corresponding with described peak pulse according to described positional information, determine the corresponding weighted factor of each sampled point signal with described input multi-transceiver combination signal, it is realized by look-up table mode or multiplier unit, when realizing in the look-up table mode, as the address, the content of look-up table is the weighted factor of each sampled point correspondence with described instantaneous power value in the input of look-up table;
Described clipping factor generation unit comprises again:
One peak factor expanding element is used to produce a coefficient square wave corresponding to the described peak factor factor, and it is realized by a multistage multiplier architecture or be made up of a multistage multiplier and first in first out sequence, reaches
One clipping factor extraction unit, be used for described coefficient square wave is carried out smoothing processing, generate clipping factor, it is made of a low pass filter, and the exponent number of this low pass filter is less than the ratio of the spreading rate of data sampling speed and handled input multi-transceiver combination signal;
Described cancellation pulses generation unit comprises again:
One delay unit is used for that the time delay of described input multi-transceiver combination signal is carried out time delay with described clipped signal and aligns;
One subtrator is used for the signal subtraction of described clipped signal and the output of described delay unit is extracted the cancellation pulses signal; And
One pulse-shaping filter is used for that described cancellation pulses signal is carried out the moulding Filtering Processing and generates filtered cancellation pulses signal, this formed filter be one with the low pass filter of described input multi-transceiver combination signal same frequency spectrum characteristic.
2. the multi-carrier signal clipping device of optimization according to claim 1 is characterized in that, described peak clipper unit comprises again:
One delay unit is used for that described input multi-transceiver combination signal is carried out time delay with described clipping factor and aligns; And
One multiplier unit is used for multi-transceiver combination signal after described delay unit delay process and described clipping factor are multiplied each other, and multiplied result is exported as clipped signal.
3. the multi-carrier signal clipping device of optimization according to claim 1 is characterized in that, described peak pulse offset unit comprises again:
One delay unit is used for described clipped signal being delayed time and carrying out time delay with described cancellation pulses signal and align; And
One subtractor unit is used for clipped signal and described cancellation pulses signal after described delay unit time delay alignment being synthesized the multi-transceiver combination signal behind the output slicing.
4. the multi-carrier signal clipping method of an optimization is characterized in that, comprising:
Step 71 is handled the extraction peak pulse to input multi-transceiver combination signal, obtains the peak factor factor corresponding to described peak pulse;
Step 72 is handled the clipping factor that obtains corresponding to described peak pulse to the described peak factor factor;
Step 73 is weighted processing according to described clipping factor to the described input multi-transceiver combination signal after postpone handling, and generates clipped signal;
Step 74 utilizes described clipped signal to produce the cancellation pulses signal in conjunction with described input multi-transceiver combination signal; And
Step 75 is synthesized described clipped signal after the delay process and described cancellation pulses signal, the multi-transceiver combination output signal behind the generation slicing;
Described step 71 comprises again:
Step 711 is calculated the instantaneous power value of described each sampled point of input multi-transceiver combination signal;
Step 712 is extracted the corresponding slicing factor to each sampled point greater than the slicing thresholding, and less than each sampled point of slicing thresholding, its corresponding slicing factor is made as 1;
Step 713, according to the magnitude relationship of the instantaneous power value of continuous four sampled point A, B, C, D and the position that described slicing thresholding is determined peak pulse, as logical relation B＞A and C＞D, and the maximum of B and C obtains the positional information of peak pulse during greater than described slicing thresholding;
Step 714 is exported as the peak factor factor with the slicing factor that the maximum sampled point at described peak pulse place obtains;
Described step 72 comprises again:
Step 721 is carried out extension process to the described peak factor factor, forms range value and the equal-sized coefficient square wave of the described peak factor factor; And
Step 722 is carried out smoothing processing to described coefficient square wave, obtains the clipping factor corresponding to described peak pulse;
The duration of described coefficient square wave is decided according to the exponent number that carries out the filter of described smoothing processing;
Described step 74 comprises again:
Step 741, the input multi-transceiver combination signal after utilizing described clipped signal in conjunction with delay process produces the cancellation pulses signal; And
Step 742 is carried out the moulding Filtering Processing to described cancellation pulses signal, generates filtered cancellation pulses signal.
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| CN101442348B (en) * | 2008-12-22 | 2013-08-07 | 华为技术有限公司 | Method, apparatus, system for clipping signal and signal radiation system |
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| KR102319154B1 (en) | 2017-11-17 | 2021-10-29 | 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) | Device and method for signal processing in licensed assisted access radio system |
| CN109600772B (en) * | 2018-12-13 | 2020-09-29 | 京信通信系统（中国）有限公司 | Method and device for eliminating in-band spurious emission, master controller and repeater equipment thereof |
| CN111385231A (en) * | 2018-12-27 | 2020-07-07 | 中兴通讯股份有限公司 | Signal peak clipping method, device, equipment and computer readable storage medium |
| CN111107034B (en) * | 2019-12-26 | 2022-02-11 | 三维通信股份有限公司 | System, method and computer-readable storage medium for reducing signal peak-to-average ratio |
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