CN105245480B - digital signal processing method and device - Google Patents
digital signal processing method and device Download PDFInfo
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- CN105245480B CN105245480B CN201510537310.1A CN201510537310A CN105245480B CN 105245480 B CN105245480 B CN 105245480B CN 201510537310 A CN201510537310 A CN 201510537310A CN 105245480 B CN105245480 B CN 105245480B
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Abstract
The present invention provides a kind of Digital Signal Processing Method And Devices, this method comprises: carrying out interpolation to the first digital signal with N number of point, obtain the second digital signal, wherein, each point in first digital signal is interpolated to M point, wherein, N and M is all larger than equal to 2, and the phase difference in this M point between two neighboring point is Q；N*M point in the second digital signal is divided into N number of grouping in order, wherein N number of point in the first digital signal is located on the position in addition to two endpoints in corresponding grouping；The point that an amplitude maximum is chosen from each grouping in N number of grouping, obtains third digital signal, wherein each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-1) * Q；Peak clipping processing is carried out to the first digital signal according to third digital signal.To solve in the related technology when carrying out peak clipping, the big problem of phase error between cancellation pulses and main signal.
Description
Technical field
The present invention relates to the communications fields, in particular to a kind of Digital Signal Processing Method And Device.
Background technique
Mobile communication base station sender is from original one-segment single system single carrier gradually to multiband multi-standard multicarrier
Transition, especially as fourth generation mobile communication technology (the 4th Generation mobile communication
Technology, referred to as 4G) the extensive commercialization of long term evolution (Long-Term Evolution, referred to as LTE), signal
Configured bandwidth maximum will support several hundred MHz, this big band width configuration of multicarrier papr (Peak with higher
To Average Power Ratio, referred to as PAPR).Peak power is easy to greatly very much to cause more than the saturation point of power amplifier
The compression of signal is serious, so that the adjacent channel for influencing antenna opening transmitting signal is revealed than (Adjacent Channel
Leakage power Ratio, referred to as ACLR).In order to reduce this non-linear distortion, usually to guarantee the peak value of signal not
The saturation compression point that can exceed that power amplifier, this requires the mean powers of signal to retract according to peak-to-average force ratio, leads to power amplifier
Efficiency reduces, and since back-off also reduces the coverage area of base station, in order to reduce the rollback of mean power, meeting
The PAPR of signal is reduced in numeric field, peak clipping is exactly a kind of technology that signal PAPR is reduced in numeric field.
The peak clipping technology that industry uses at present is mainly peak pulse molding cancellation algorithms, which is with victim signal
Error vector magnitude (Error Vector Magnitude, referred to as EVM) is cost to exchange low PAPR's for.Peak pulse at
Type cancellation algorithms mainly include that peak value searching and formed filter calculate two modules, and wherein the method for peak value searching determines most
Whole peak clipping performance.The peak value searching used for the current industry of broadband signal is usually that traditional filtering interpolation adds peak value to extract
Method, although this method can find big peak value, but because interpolation and peak value extraction cause cancellation pulses to have with main signal
Bigger phase error, and interpolation multiple is higher, phase error is bigger, the phase error will affect after peak clipping PAPR and
EVM。
It is asked for, when carrying out peak clipping, phase error between cancellation pulses and main signal is big present in the relevant technologies
Topic, currently no effective solution has been proposed.
Summary of the invention
The present invention provides a kind of Digital Signal Processing Method And Device, at least solve present in the relevant technologies into
When row peak clipping, the big problem of phase error between cancellation pulses and main signal.
According to an aspect of the invention, there is provided a kind of digital signal processing method, comprising: to N number of point
One digital signal carries out interpolation, obtains the second digital signal, wherein each point in first digital signal is interpolated to M
A point, wherein N and M is all larger than equal to 2, and the phase difference in the M point between two neighboring point is Q；In order by described
N*M point in two digital signal is divided into N number of grouping, wherein the 2nd in N number of point in first digital signal
It is located on the position in addition to two endpoints in corresponding grouping to n-th point；From each grouping in N number of grouping
The point for choosing an amplitude maximum, obtains third digital signal, wherein each point and the N in the third digital signal
Phase difference in a point between corresponding point is less than (M-1) * Q；According to the third digital signal to first digital signal
Carry out peak clipping processing.
Optionally, carrying out peak clipping processing to first digital signal according to the third digital signal includes: from described
Amplitude is searched in third digital signal is more than or equal to the point of first threshold and the point less than the first threshold；Described the will be less than
The amplitude of the point of one threshold value is set as 0, and the amplitude of the point more than or equal to first threshold is reduced the first threshold, with
Obtain the 4th digital signal；Peak clipping processing is carried out to first digital signal using the 4th digital signal, wherein described
Peak clipping processing for reducing in first digital signal with the amplitude more than or equal to the corresponding point of the point of first threshold.
Optionally, including: to first digital signal progress peak clipping processing using the 4th digital signal will be described
First digital signal subtracts the 4th digital signal, the 5th digital signal after obtaining peak clipping；Alternatively, to the 4th number
Signal is filtered, and obtains the 6th digital signal, and first digital signal is subtracted the 6th digital signal, obtains peak clipping
The 7th digital signal afterwards.
Optionally, described pair with N number of point the first digital signal carry out interpolation, obtain the second digital signal include: by
I-th point in first digital signal ((i-1) * M+1) a point being set as in second digital signal, will be to institute
Described i-th point stated in the first digital signal is arranged into a point of row interpolation (M-1) generated in second digital signal
In ((i-1) * M+1) a point and ((i) * M+1) a point between, wherein 1≤i≤N；It is described in order by described second
It includes: to set 1st o'clock in second digital signal to the P point that N*M point in digital signal, which is divided into N number of grouping,
The 1st grouping being set in N number of grouping, wherein 2≤P≤(M-1)；By in second digital signal ((P+1)+
(j-2) * M) j-th of grouping is set as to ((P+1)+(j-1) * M-1) a point at a o'clock, wherein 2≤j≤N.
Optionally, described
Optionally, the point that an amplitude maximum is chosen from each grouping in N number of grouping obtains third number letter
It number include: the amplitude and phase for obtaining each point in each grouping in N number of grouping；Amplitude is obtained from each grouping
The amplitude of maximum point；The third number letter is generated according to the amplitude of the point of the amplitude maximum of acquisition and corresponding phase
Point in number.
According to another aspect of the present invention, provide a kind of digital signal processing device, comprising: interpolating module, for pair
The first digital signal with N number of point carries out interpolation, obtains the second digital signal, wherein every in first digital signal
A point is interpolated to M point, wherein N and M is all larger than equal to 2, and the phase difference in the M point between two neighboring point is Q；
Division module, for N*M point in second digital signal to be divided into N number of grouping in order, wherein first number
The 2nd in N number of point in word signal is located on the position in addition to two endpoints to n-th point in corresponding grouping；
Module is chosen, for choosing the point of an amplitude maximum from each grouping in N number of grouping, obtains third number letter
Number, wherein each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-1) *
Q；Processing module, for carrying out peak clipping processing to first digital signal according to the third digital signal.
Optionally, the processing module includes: searching unit, is greater than for searching amplitude from the third digital signal
Point equal to first threshold and the point less than the first threshold；Setting unit, for the point of the first threshold will to be less than
Amplitude is set as 0, and the amplitude of the point more than or equal to first threshold is reduced the first threshold, to obtain the 4th number
Signal；Processing unit, for carrying out peak clipping processing to first digital signal using the 4th digital signal, wherein institute
State peak clipping processing for reducing in first digital signal with the amplitude more than or equal to the corresponding point of the point of first threshold.
Optionally, the processing unit includes: processing subelement, for first digital signal to be subtracted the described 4th
Digital signal, the 5th digital signal after obtaining peak clipping；Or filtering subunit, for being filtered to the 4th digital signal
Wave obtains the 6th digital signal, and first digital signal is subtracted the 6th digital signal, the 7th number after obtaining peak clipping
Word signal.
Optionally, the interpolating module obtains institute for carrying out interpolation to first digital signal in the following manner
It states the second digital signal: setting the ((i- in second digital signal for i-th point in first digital signal
1) * M+1) a point, described i-th point in first digital signal will be arranged into a point of row interpolation (M-1) generated
Between ((i-1) * M+1) a point and ((i) * M+1) a point in second digital signal, wherein 1≤i≤N；Institute
Division module is stated for N*M point in second digital signal to be divided into N number of grouping in order in the following manner: will
1st o'clock to the P point in second digital signal is set as the 1st grouping in N number of grouping, wherein 2≤P
≤(M-1)；By ((P+1)+(j-2) * M) a o'clock in second digital signal to ((P+1)+(j-1) * M-1) a point
It is set as j-th of grouping, wherein 2≤j≤N.
Optionally, described
Optionally, the selection module includes: first acquisition unit, for obtaining in N number of grouping in each grouping
The amplitude and phase of each point；Second acquisition unit, the amplitude of the point for obtaining amplitude maximum from each grouping；It is raw
At unit, for being generated in the third digital signal according to the amplitude and corresponding phase of the point of the amplitude maximum of acquisition
Point.
Through the invention, interpolation is carried out using to the first digital signal with N number of point, obtains the second digital signal,
In, each point in first digital signal is interpolated to M point, wherein N and M is all larger than equal to 2, phase in the M point
Phase difference between adjacent two points is Q；N*M point in second digital signal is divided into N number of grouping in order,
In, the 2nd in N number of point in first digital signal is located in corresponding grouping to n-th point removes two endpoints
Except position on；The point that an amplitude maximum is chosen from each grouping in N number of grouping obtains third number letter
Number, wherein each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-1) *
Q；Peak clipping processing is carried out to first digital signal according to the third digital signal.Solve present in the relevant technologies
When carrying out peak clipping, the big problem of phase error between cancellation pulses and main signal, and then reached reduction cancellation pulses and main letter
The effect of phase error between number.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of digital signal processing method according to an embodiment of the present invention；
Fig. 2 is the structural block diagram of digital signal processing device according to an embodiment of the present invention；
Fig. 3 is the structural block diagram of processing module 28 in digital signal processing device according to an embodiment of the present invention；
Fig. 4 is the structural block diagram of processing unit 36 in digital signal processing device according to an embodiment of the present invention；
Fig. 5 is the structural block diagram that module 26 is chosen in digital signal processing device according to an embodiment of the present invention；
Fig. 6 is the comparison diagram of the main signal according to an embodiment of the present invention after peak clipping main signal and peak clipping；
Fig. 7 is the signal according to an embodiment of the present invention obtained after peak clipping really up to the mark processing；
Fig. 8 is the cancellation pulses according to an embodiment of the present invention formed after formed filter filters；
Fig. 9 is that the broadband peak clipping according to an embodiment of the present invention for searching peak based on minimum phase error approach is sent out in mobile communication
Penetrate position and the structural schematic diagram of machine digital link module；
Figure 10 is the peak value searching function structure chart according to an embodiment of the present invention that peak is searched based on minimum phase error approach；
Figure 11 is that the minimum phase error peak according to an embodiment of the present invention for searching peak based on minimum phase error approach is searched
The structure chart of rope module.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.
It is big in order to solve phase error present in the relevant technologies when carrying out peak clipping, between cancellation pulses and main signal
Problem, key are reaching reduction peak-to-average force ratio purpose simultaneously, reduce peak value searching bring phase error, implement in the present invention
As where reaching reduction peak-to-average force ratio purpose simultaneously in example, reduces peak value searching bring phase error, propose a kind of number
Signal processing method is below illustrated this method.
A kind of digital signal processing method is provided in the present embodiment, and Fig. 1 is number letter according to an embodiment of the present invention
The flow chart of number processing method, as shown in Figure 1, the process includes the following steps:
Step S102 carries out interpolation to the first digital signal with N number of point, obtains the second digital signal, wherein this
Each point in one digital signal is interpolated to M point, wherein N and M is all larger than equal to 2, in this M point two neighboring point it
Between phase difference be Q；
N*M point in second digital signal is divided into N number of grouping in order by step S104, wherein the first number letter
The 2nd in N number of point in number is located on the position in addition to two endpoints to n-th point in corresponding grouping；
Step S106 chooses the point of an amplitude maximum from each grouping in N number of grouping, obtains third number letter
Number, wherein each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-1) * Q；
Step S108 carries out peak clipping processing to the first digital signal according to third digital signal.
Through the above steps, when being grouped to N*M point, point in the first digital signal in each group non-
On endpoint location, also, the point for the amplitude maximum chosen in every group with the phase of the point in the first digital signal in corresponding group
Position error is less than (M-1) * Q, is located at the starting endpoint position in every group for the point in the first digital signal in the related technology
On, the scheme in the embodiment of the present invention can effectively reduce the third digital signal (phase of the third digital signal and above-mentioned
The phase of cancellation pulses is consistent) and the first digital signal (corresponding to above-mentioned main signal) between phase error, to reduce
Phase error between cancellation pulses and main signal.It solves present in the relevant technologies when carrying out peak clipping, cancellation pulses and master
The big problem of phase error between signal, and then achieved the effect that reduce the phase error between cancellation pulses and main signal (the
Comparison diagram before and after one digital signal peak clipping can refer to aftermentioned Fig. 6, it should be noted that Fig. 6 is only an example).
In an alternative embodiment, the operation executed in above-mentioned step S108 is according to third digital signal to
One digital signal carries out peak clipping processing, which below can be illustrated step S108 to be a variety of: from the
Amplitude is searched in three digital signals is more than or equal to the point of first threshold and the point less than first threshold；The point of first threshold will be less than
Amplitude be set as 0, and the point for the first threshold that will be greater than or equal to amplitude reduce first threshold, to obtain the 4th digital signal；
Peak clipping processing is carried out to the first digital signal using the 4th digital signal, wherein peak clipping processing is for reducing the first number letter
Amplitude ((Fig. 7 shown in Fig. 7 that the 4th digital signal can be as be described hereinafter of point corresponding with the point of first threshold is more than or equal in number
It is only a kind of example)).
In an alternative embodiment, peak clipping processing packet is carried out to the first digital signal using above-mentioned 4th digital signal
It includes: the first digital signal is subtracted into the 4th digital signal, the 5th digital signal after obtaining peak clipping；Alternatively, believing the 4th number
It number is filtered, obtains the 6th digital signal, the first digital signal is subtracted into the 6th digital signal, the 7th number after obtaining peak clipping
((Fig. 8 is only word signal shown in Fig. 8 that the 6th digital signal obtained after being filtered to the 4th digital signal can be as be described hereinafter
A kind of example)).
In an alternative embodiment, interpolation is carried out to the first digital signal with N number of point, obtains the second number letter
Number include: by i-th point of ((i-1) * M+1) a point being set as in the second digital signal in the first digital signal, will be right
I-th point in first digital signal is arranged in the ((i- in the second digital signal into row interpolation (M-1) generated a point
1) * M+1) between a point and ((i) * M+1) a point, wherein 1≤i≤N；In order by N*M point in the second digital signal
Being divided into N number of grouping includes: 1st minute set 1st o'clock to the P point in the second digital signal in N number of grouping
Group, wherein 2≤P≤(M-1)；By ((P+1)+(j-2) * M) a o'clock to ((P+1)+(j-1) * in the second digital signal
M-1) a point is set as j-th of grouping, wherein 2≤j≤N.That is, by above-mentioned grouping, it can be by the N in the first digital signal
A point is respectively allocated in N number of group, and position of each point in N number of point in first digital signal in corresponding grouping
At non-endpoint, the point of the subsequent amplitude maximum selected from every group and right can reduce by above-mentioned interpolation and group technology
It should phase difference between the point in the first digital signal in group.
In an alternative embodiment, above-mentionedWherein,To be taken downwards to the result that M/2 is obtained
It is whole, when P isWhen, it is ensured that the point in the first digital signal in above-mentioned grouping in addition to first group, in remaining each group
At the middle position of this group of all the points, it may be implemented in the point and corresponding group of the subsequent amplitude maximum selected from every group
The first digital signal in point between phase difference minimum.
In an alternative embodiment, it in above-mentioned step S106, describes from each grouping in N number of grouping
The point for choosing an amplitude maximum obtains third digital signal, and the implementation of the step can be a variety of, such as: it obtains N number of
In grouping in each grouping each point amplitude and phase；The amplitude of the point of amplitude maximum is obtained from each grouping；According to
The amplitude of the point of the amplitude maximum of acquisition and corresponding phase generate the point in third digital signal.
Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation
The method of example can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but it is very much
In the case of the former be more preferably embodiment.Based on this understanding, technical solution of the present invention is substantially in other words to existing
The part that technology contributes can be embodied in the form of software products, which is stored in a storage
In medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, calculate
Machine, server or network equipment etc.) execute method described in each embodiment of the present invention.
A kind of digital signal processing device is additionally provided in the present embodiment, and the device is for realizing above-described embodiment and excellent
Embodiment is selected, the descriptions that have already been made will not be repeated.As used below, predetermined function may be implemented in term " module "
Software and/or hardware combination.Although device described in following embodiment is preferably realized with software, hardware,
Or the realization of the combination of software and hardware is also that may and be contemplated.
Fig. 2 is the structural block diagram of digital signal processing device according to an embodiment of the present invention, as shown in Fig. 2, the device packet
It includes interpolating module 22, division module 24, choose module 26 and processing module 28, the device is illustrated below.
Interpolating module 22, for obtaining the second digital signal to the first digital signal progress interpolation with N number of point,
In, each point in first digital signal is interpolated to M point, wherein N and M is all larger than two neighboring in equal to 2, M point
Phase difference between point is Q；Division module 24 is connected to above-mentioned interpolating module 22, and being used in order will be in the second digital signal
N*M point be divided into N number of grouping, wherein the 2nd in N number of point in first digital signal is to n-th point at corresponding minute
It is located on the position in addition to two endpoints in group；Module 26 is chosen, above-mentioned division module 24 is connected to, is used for from N number of grouping
In each grouping in choose an amplitude maximum point, obtain third digital signal, wherein every in the third digital signal
Phase difference between a point and corresponding point in N number of point is less than (M-1) * Q；Processing module 28 is connected to above-mentioned selection module 26,
For carrying out peak clipping processing to the first digital signal according to third digital signal.
Fig. 3 is the structural block diagram of processing module 28 in digital signal processing device according to an embodiment of the present invention, such as Fig. 3 institute
Show, which includes searching unit 32, setting unit 34 and processing unit 36, is said below to the processing module 28
It is bright.
Searching unit 32 is more than or equal to the point of first threshold and less than first for searching amplitude from third digital signal
The point of threshold value；Setting unit 34 is connected to above-mentioned searching unit 32, the amplitude setting of the point for that will be less than above-mentioned first threshold
It is 0, and the amplitude of the point for the first threshold that will be greater than or equal to reduces first threshold, to obtain the 4th digital signal；Processing unit 36,
It is connected to above-mentioned setting unit 34, for carrying out peak clipping processing to the first digital signal using the 4th digital signal, wherein this is cut
Peak is handled for reducing the amplitude of point corresponding with the point of first threshold is more than or equal in the first digital signal.
Fig. 4 is the structural block diagram of processing unit 36 in digital signal processing device according to an embodiment of the present invention, such as Fig. 4 institute
Show, which includes processing subelement 42 or filtering subunit 44, is illustrated below to the processing unit 36.
Subelement 42 is handled, the 5th number for the first digital signal to be subtracted the 4th digital signal, after obtaining peak clipping
Signal；Filtering subunit 44 obtains the 6th digital signal, by the first digital signal for being filtered to the 4th digital signal
The 6th digital signal is subtracted, the 7th digital signal after obtaining peak clipping.Wherein, the processing subelement 42 in Fig. 4 and filtering are single
Member 44 is drawn with dotted line, shows that the processing unit 36 includes processing subelement 42, alternatively, the processing unit 36 includes filtering
Unit 44.
In an alternative embodiment, above-mentioned interpolating module 22 can in the following manner carry out the first digital signal
Interpolation obtains the second digital signal: by i-th point of ((i- being set as in the second digital signal in the first digital signal
1) * M+1) a point, will to i-th point in the first digital signal into a point setting of row interpolation (M-1) generated in the second number
Between ((i-1) * M+1) a point and ((i) * M+1) a point in word signal, wherein 1≤i≤N；Above-mentioned division module 24
N*M point in the second digital signal can be divided into N number of grouping in order in the following manner: will be in the second digital signal
1st o'clock to the P point be set as the 1st in N number of grouping grouping, wherein 2≤P≤(M-1)；By the second digital signal
In ((P+1)+(j-2) * M) a o'clock be set as j-th of grouping to ((P+1)+(j-1) * M-1) a point, wherein 2≤j≤
N。
In an alternative embodiment, above-mentioned
Fig. 5 is the structural block diagram that module 26 is chosen in digital signal processing device according to an embodiment of the present invention, such as Fig. 5 institute
Show, which includes first acquisition unit 52, second acquisition unit 54 and generation unit 56, below to the selection module
26 are illustrated.
First acquisition unit 52, for obtaining the amplitude and phase of each point in each grouping in N number of grouping；Second obtains
Unit 54 is connected to above-mentioned first acquisition unit 52, the amplitude of the point for obtaining amplitude maximum from each grouping；It generates single
Member 56, is connected to above-mentioned second acquisition unit 54, for raw according to the amplitude of the point of the amplitude maximum of acquisition and corresponding phase
At the point in third digital signal.
The above embodiments are mainly for how interpolation, grouping and search peak are illustrated, below with reference to entirety
Peak clipping process is illustrated:
It also proposed a kind of width that peak is searched for the minimum phase error of broad band multicarrier signal in embodiments of the present invention
Band despicking method and device.The peak value searching method that minimum phase error is used to broad band multicarrier signal, to the peak value of signal
Accurately estimate, has realized high-speed and search peak, the peak clipping scheme of the peak clipping of low rate not only improves broadband signal
RF index improves the efficiency of power amplifier output, and also reduces the expense of logical resource, saves cost.Wherein, it is based on
Minimum phase error searches peak width band peak cutting device, including following module:
Main signal Postponement module, Digital Up Convert module, signal modulus value PHASE SEPARATION module, the peak value of minimum phase error
Search module, hard peak-clipping module, the modulus value and phase measurements module of peak value, formed filter computing module, peak value offset module；
Each module is illustrated below:
Main signal Postponement module carries out the delay of certain time, to peak clipping entry signal mainly for guaranteeing and generating
Cancellation pulses the time be alignment.
Digital Up Convert module carries out multistage up-sampling to the digital medium-frequency signal received, improves the rate of signal, mention
The accuracy that peak value is estimated.
Signal modulus value PHASE SEPARATION module carries out modulus value and PHASE SEPARATION to the IQ complex signal after up-conversion.
The peak value searching module of minimum phase error carries out big peak value searching according to the modulus value of signal, and guarantee with it is upper
The phase error of signal before sampling wants as small as possible.
Hard peak-clipping module subtracts each other the signal modulus value after peak value searching with preset peak clipping thresholding, seeks the letter to be offset
Number peak value；
The modulus value and phase measurements module of peak signal: the corresponding phase measurements complex signal of peak signal.
Formed filter computing module, according to the carrier filter coefficient of main signal, frequency control word and power information,
Generate the formed filter coefficient to match with main signal.
Peak value offset module: being filtered peak signal, generates cancellation pulses, main signal and counteracting after delay
Pulse is subtracted each other, and achievees the purpose that peak clipping.
Minimum phase error peak search module further include: peak packet module and peak value abstraction module.
Wherein, peak packet module, the main signal minimum phase error principle according to all peak values of guarantee and before up-sampling,
Peak signal after multistage up-sampling is grouped, length, that is, multilevel interpolation multiple of interior signal is organized, inside every group, according to
The position of main signal, grouping in this way make before peak value after peak-to-average force ratio adaptive configuration interpolation and interpolation after peak clipping
The peak value of all signals and the phase error of main signal are optimal, improve after peak clipping to a certain extent the PAPR of signal and
EVM index.
Peak value abstraction module screens the peak signal in every group, is extracted according to the maximum principle of peak value, and remember
Record is drawn into the position of peak value, carries out phase bit extraction according to the position of peak value, peak signal and the main signal of peak clipping speed after extraction
Rate is consistent.
The broadband despicking method for searching peak based on minimum phase error of the embodiment of the present invention is said with reference to the accompanying drawing
It is bright,
Fig. 6 is the comparison diagram of the main signal according to an embodiment of the present invention after peak clipping main signal and peak clipping, wherein real
The signal modulus value of line expression peak clipping entrance；Chain-dotted line indicates the modulus value of signal after peak clipping, in Fig. 6 by taking the 1413rd sampled point as an example.
This method comprises the following steps:
Step 1, the signal of current ink and the configuration information of signal are received, corresponding peak clipping thresholding is then configured, is carried
Wave filter coefficient, the information such as frequency control word of carrier wave.
Step 2, multi-stage digital upconversion process carries out at multilevel interpolation filtering signal according to the bandwidth of input signal
Reason carries out peak value and estimates.
Step 3, signal modulus value and PHASE SEPARATION processing.Calculate current inphase quadrature (in-phase/Quadrature,
Referred to as IQ) complex signal modulus value and phase.
Step 4, peak packet is handled.The modulus value of signal is grouped according to the multiple of interpolation.
Step 5, peak value extraction is handled.To in every group peak signal carry out Digital Down Convert processing, extract to main letter
Number phase same rate.
Step 6, hard peak clipping processing.Peak signal and preset peak clipping thresholding are subtracted each other to obtain the peak value letter for needing to offset
Number, as shown in fig. 7, Fig. 7 is the obtained signal according to an embodiment of the present invention after peak clipping really up to the mark processing, the 1413rd point in Fig. 7
That is the obtained modulus value to be offset subtracted each other of original signal (that is, main signal when peak clipping) modulus value and peak clipping thresholding.
Step 7, modulus value and phase measurements IQ complex signal are handled.By the corresponding phase measurements IQ letter in reply of peak signal
Number.
Step 8, formed filter is generated.According to the frequency control word of signal, carrier filter coefficient, carrier power information
Calculate the formed filter coefficient of signal.
Step 9, peak value offset is handled.The formed filter coefficient of signal and generation after peak value is extracted first is filtered
Wave processing, generates cancellation pulses, for carrying out peak clipping counteracting with original signal.Then subtracted each other with main signal is corresponding with cancellation pulses,
The signal of certain peak-to-average force ratio after final peak clipping is obtained, digital pre-distortion block is given, as shown in figure 8, Fig. 8 is according to the present invention
The cancellation pulses of embodiment formed after formed filter filters.The pulse with after the signal cancellation after delay to get arriving
Signal after peak clipping shown in Fig. 6 chain lines.
Fig. 9 is that the broadband peak clipping according to an embodiment of the present invention for searching peak based on minimum phase error approach is sent out in mobile communication
Position and the structural schematic diagram of machine digital link module are penetrated, as shown in figure 9, device is located in transmitter in the embodiment of the present invention
After Digital Up Convert (Digital Up Converter, referred to as DUC) module of digital link, digital pre-distortion
It mainly include main signal time delay module (that is, in Fig. 9 before (Digital Pre-Distortion, referred to as DPD) module
Time delay module), peak value searching module and the online formed filter coefficient module that calculates are (that is, the formed filter in Fig. 9 calculates mould
Block).
Wherein, main signal time delay module is that the delay of certain time is carried out to the signal of peak clipping entrance, for guaranteeing and producing
Raw cancellation pulses are alignment in the time.Peak value searching module is that the big peak value of signal is found out by certain algorithm, so as to
For generating cancellation pulses.Formed filter computing module is signal ACLR deterioration after peak clipping in order to prevent, is generated in real time and main
The filter coefficient that link signal matches.
Figure 10 is the peak value searching function structure chart according to an embodiment of the present invention that peak is searched based on minimum phase error approach,
As shown in Figure 10, which mainly includes Digital Up Convert, signal and modulus value PHASE SEPARATION, minimum phase error
Peak value searching, phase bit extraction, hard peak clipping, IQ complex signal synthesize, and following operation is mainly executed in the peak value searching module:
Step 1, multilevel interpolation is carried out to the signal for entering peak clipping, carries out big peak value and estimate, interpolation multiple can be according to letter
Number total bandwidth flexible choice configuration；
Step 2, modulus value and PHASE SEPARATION are carried out using digital signal processing algorithm to IQ complex signal, finds out signal respectively
Modulus value and phase, wherein modulus value is used to carry out peak value searching, and phase is postponed, and phase abstraction module is given；This module
The modulus value and PHASE SEPARATION algorithm of signal include but is not limited to multistage cordic iterative algorithm etc.；
Step 3, peak value searching is carried out according to the modulus value size of signal, mainly includes that peak packet and peak value extract, specifically
Implementation detail will be described in detail in Figure 11；
Step 4, according to the address of the big peak signal exported in step 3, phase bit extraction is carried out, the phase after extraction is given
IQ complex signal synthesis module；
Step 5, the big peak signal after search is subtracted each other with presetting peak clipping thresholding, generates the noise to be offset letter
Number；
Step 6, the noise signal after hard peak clipping is synthesized into IQ with the phase digital signal processing algorithm after corresponding extract
Complex signal, for being filtered with formed filter coefficient.Above-mentioned digital signal processing algorithm includes but is not limited to more
Grade cordic iterative algorithm etc..
Figure 11 is that the minimum phase error peak according to an embodiment of the present invention for searching peak based on minimum phase error approach is searched
The structure chart of rope module mainly includes that peak packet and peak value extract two modules.
Peak packet module, according to the main signal minimum phase error principle before guaranteeing all peak values and up-sampling, to more
Peak signal is grouped after grade up-sampling, length, that is, multilevel interpolation multiple of interior signal is organized, inside every group, according to peak clipping
Peak-to-average force ratio adaptive configuration packet parameters afterwards, the position of main signal before the peak value and interpolation after interpolation has been configured according to packet parameters
It sets, grouping in this way, the peak value of all signals and the phase error of main signal made is optimal.
Peak value abstraction module screens the peak signal in every group, carries out peak value extraction according to the maximum principle of peak value, and
Phase abstraction module is given the peak value address after extraction, peak signal is consistent with the main signal rate of peak clipping after extraction, realizes
Peak clipping scheme under peak low rate is searched under high-speed.
Here specific embodiment has been passed through to the present invention have been described in detail, the description of scheme can be convenient
Those skilled in the art's manufacture is applicable in the present invention.The present invention is not limited to the peak clipping of one-segment, to two-band and multiband
Application scenarios are all suitable for and are compatible with.The present invention is not limited to the inhibition of the peak-to-average force ratio of signal in correction communication system, are related to other
Single carrier and multicarrier reduce peak-to-average force ratio scene and all use.
It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong
Following manner realization is crossed, but not limited to this: above-mentioned module is respectively positioned in same processor；Alternatively, above-mentioned module be located at it is more
In a processor.
The embodiments of the present invention also provide a kind of storage mediums.Optionally, in the present embodiment, above-mentioned storage medium can
To be arranged to store the program code for executing following steps:
S1 carries out interpolation to the first digital signal with N number of point, obtains the second digital signal, wherein first number
Each point in signal is interpolated to M point, wherein N and M is all larger than equal to 2, the phase in this M point between two neighboring point
Potential difference is Q；
N*M point in second digital signal is divided into N number of grouping in order, wherein in the first digital signal by S2
The 2nd in N number of point is located on the position in addition to two endpoints to n-th point in corresponding grouping；
S3 chooses the point of an amplitude maximum from each grouping in N number of grouping, obtains third digital signal, wherein
Each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-1) * Q；
S4 carries out peak clipping processing to the first digital signal according to third digital signal.
Optionally, in the present embodiment, above-mentioned storage medium can include but is not limited to: USB flash disk, read-only memory (Read-
Only Memory, referred to as ROM), it is random access memory (Random Access Memory, referred to as RAM), mobile hard
The various media that can store program code such as disk, magnetic or disk.
Optionally, in the present embodiment, processor executes S1-S4 according to program code stored in storage medium.
Optionally, the specific example in the present embodiment can be with reference to described in above-described embodiment and optional embodiment
Example, details are not described herein for the present embodiment.
In summary, the minimum phase error searching method proposed in the embodiment of the present invention compares the current institute of current industry
Conventional peak searching method mainly has following advantage, first is that using multilevel interpolation filter peak pre-estimating technology, and its
According to signal bandwidth flexible configuration interpolation multiple, peak regeneration after peak clipping is effectively prevented；Second is that proposing a kind of based on minimum
The peak search algorithm of phase error improves EVM index after broadband signal peak clipping under the premise of guaranteeing peak-to-average force ratio；Third is that hair
It is bright to consider real current resources service condition, using the method that high-speed searches peak low speed peak clipping, the logical resource effectively reduced
Expense significantly reduces cost.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of digital signal processing method characterized by comprising
Interpolation is carried out to the first digital signal with N number of point, obtains the second digital signal, wherein first digital signal
In each point be interpolated to M point, wherein N and M is all larger than equal to 2, the phase in the M point between two neighboring point
Difference is Q；
N*M point in second digital signal is divided into N number of grouping in order, wherein in first digital signal
N number of point in the 2nd be located on position in addition to two endpoints in corresponding grouping to n-th point；
The point that an amplitude maximum is chosen from each grouping in N number of grouping, obtains third digital signal, wherein institute
The phase difference stated between each point and corresponding point in N number of point in third digital signal is less than (M-1) * Q；
Peak clipping processing is carried out to first digital signal according to the third digital signal.
2. the method according to claim 1, wherein being believed according to the third digital signal first number
Number carry out peak clipping processing include:
Amplitude is searched from the third digital signal is more than or equal to the point of first threshold and the point less than the first threshold；
0 is set by the amplitude for being less than the point of the first threshold, and the amplitude of the point more than or equal to first threshold is dropped
The low first threshold, to obtain the 4th digital signal；
Peak clipping processing is carried out to first digital signal using the 4th digital signal, wherein the peak clipping processing is used for
Reduce in first digital signal with the amplitude more than or equal to the corresponding point of the point of first threshold.
3. according to the method described in claim 2, it is characterized in that, being believed using the 4th digital signal first number
Number carry out peak clipping processing include:
First digital signal is subtracted into the 4th digital signal, the 5th digital signal after obtaining peak clipping；Alternatively,
4th digital signal is filtered, the 6th digital signal is obtained, first digital signal is subtracted described
Six digital signals, the 7th digital signal after obtaining peak clipping.
4. the method according to claim 1, wherein
Described pair of the first digital signal with N number of point carries out interpolation, and obtaining the second digital signal includes: by first number
I-th point in signal ((i-1) * M+1) a point being set as in second digital signal will believe first number
Described i-th point in number is arranged in ((i-1) * in second digital signal into row interpolation (M-1) generated a point
M+1) between a point and ((i) * M+1) a point, wherein 1≤i≤N；
It is described in order by N*M point in second digital signal be divided into it is N number of grouping include: by it is described second number letter
1st o'clock to the P point in number is set as the 1st grouping in N number of grouping, wherein 2≤P≤(M-1)；It will be described
((P+1)+(j-2) * M) a o'clock in second digital signal is set as j-th minute to ((P+1)+(j-1) * M-1) a point
Group, wherein 2≤j≤N.
5. according to the method described in claim 4, it is characterized in that, described
6. the method according to claim 1, wherein choosing one from each grouping in N number of grouping
The point of amplitude maximum, obtaining third digital signal includes:
Obtain the amplitude and phase of each point in each grouping in N number of grouping；
The amplitude of the point of amplitude maximum is obtained from each grouping；
The point in the third digital signal is generated according to the amplitude of the point of the amplitude maximum of acquisition and corresponding phase.
7. a kind of digital signal processing device characterized by comprising
Interpolating module obtains the second digital signal, wherein described for carrying out interpolation to the first digital signal with N number of point
Each point in first digital signal is interpolated to M point, wherein N and M is all larger than equal to 2, two neighboring in the M point
Phase difference between point is Q；
Division module, for N*M point in second digital signal to be divided into N number of grouping in order, wherein described
The 2nd in N number of point in one digital signal is located at the position in addition to two endpoints to n-th point in corresponding grouping
On；
Module is chosen, for choosing the point of an amplitude maximum from each grouping in N number of grouping, obtains third number
Signal, wherein each point in the third digital signal and the phase difference between corresponding point in N number of point are less than (M-
1)*Q；
Processing module, for carrying out peak clipping processing to first digital signal according to the third digital signal.
8. device according to claim 7, which is characterized in that the processing module includes:
Searching unit is more than or equal to the point of first threshold and is less than described for searching amplitude from the third digital signal
The point of one threshold value；
Setting unit for setting 0 for the amplitude for being less than the point of the first threshold, and described will be more than or equal to first threshold
The amplitude of point reduce the first threshold, to obtain the 4th digital signal；
Processing unit, for carrying out peak clipping processing to first digital signal using the 4th digital signal, wherein described
Peak clipping processing for reducing in first digital signal with the amplitude more than or equal to the corresponding point of the point of first threshold.
9. device according to claim 8, which is characterized in that the processing unit includes:
Subelement is handled, the 5th number for first digital signal to be subtracted the 4th digital signal, after obtaining peak clipping
Word signal；Alternatively,
Filtering subunit obtains the 6th digital signal, by first number for being filtered to the 4th digital signal
Signal subtracts the 6th digital signal, the 7th digital signal after obtaining peak clipping.
10. device according to claim 7, which is characterized in that
The interpolating module obtains the second number letter for carrying out interpolation to first digital signal in the following manner
Number: ((i-1) * M+1) a point in second digital signal is set by i-th point in first digital signal,
Described i-th point in first digital signal will be counted into a point setting of row interpolation (M-1) generated described second
Between ((i-1) * M+1) a point and ((i) * M+1) a point in word signal, wherein 1≤i≤N；
The division module is N number of for being in the following manner in order divided into N*M point in second digital signal
Grouping: setting the 1st grouping in N number of grouping for 1st o'clock to the P point in second digital signal,
In, 2≤P≤(M-1)；By ((P+1)+(j-2) * M) a o'clock to ((P+1)+(j-1) * M- in second digital signal
1) a point is set as j-th of grouping, wherein 2≤j≤N.
11. device according to claim 10, which is characterized in that described
12. device according to claim 7, which is characterized in that the selection module includes:
First acquisition unit, for obtaining the amplitude and phase of each point in each grouping in N number of grouping；
Second acquisition unit, the amplitude of the point for obtaining amplitude maximum from each grouping；
Generation unit, for generating the third number according to the amplitude and corresponding phase of the point of the amplitude maximum of acquisition
Point in signal.
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