CN109889465A - A kind of method for suppressing peak to average ratio, device, electronic equipment and readable storage medium storing program for executing - Google Patents
A kind of method for suppressing peak to average ratio, device, electronic equipment and readable storage medium storing program for executing Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of method for suppressing peak to average ratio, device, electronic equipment and readable storage medium storing program for executing, applied to wireless communication technology field, the described method includes: calculating Cumulative Distribution Function CDF value Pr according to default complementary Cumulative Distribution Function CCDF value B and CCDF function；According to CDF value Pr, default PAPR threshold gamma and default amplitude limit value calculation formula, the amplitude limit value A of companding function is obtained, according to amplitude limit value A, obtains companding function, companding is carried out to ofdm signal according to companding function, the ofdm signal after obtaining companding.Compared with prior art, the present invention can reduce the distortion of ofdm signal.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly to a kind of method for suppressing peak to average ratio, device, electronic equipment
And readable storage medium storing program for executing.
Background technique
It is communicated in OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing)
In, due to being influenced by power amplification nonlinearity, when PAPR (Peak to Average Power Ratio, the peak of ofdm signal
Than) it is excessively high when, will lead to ofdm signal and have biggish distortion, to be seriously affected to the generation of the performance of system.Cause
And the PAPR for how reducing ofdm signal is a crucial problem, ofdm system can be helped to promote anti-power amplifier non-linear dry
The ability disturbed, the performance for improving ofdm system are of great significance.
The method for suppressing peak to average ratio of existing companding class includes: margining amplitude technique, linear companding method and non-linear companding method etc., limit
Width method is directly to compress to significantly signal, is more than the signal limiting of certain value in a fixed value, the party by amplitude
The mean power that method will lead to signal reduces, so that signal be made to have biggish distortion.Linear companding method is using piecewise linearity
Function carries out companding to the amplitude of ofdm signal, still, due to linear companding function to the biggish signal inhibition level of amplitude not
Foot, this method function are limited to the PAPR inhibitory effect of ofdm signal.Non-linear companding method is to carry out the amplitude of ofdm signal
Nonlinear transformation, still, what is be subjected to due to the signal amplitude of OFDM is non-linear distortion, this method will lead to ofdm signal have compared with
Big distortion.As it can be seen that existing method for suppressing peak to average ratio causes ofdm signal to have larger distortion.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of method for suppressing peak to average ratio, device, electronic equipment and readable storage
Medium, to reduce the distortion of ofdm signal.Specific technical solution is as follows:
The embodiment of the invention provides a kind of method for suppressing peak to average ratio, which comprises
According to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN=B calculates Cumulative Distribution Function
CDF value Pr, N indicate the number of samples of OFDM signal, PrNIndicate the peak-to-average force ratio PAPR of the ofdm signal≤pre-
If the probability of PAPR threshold gamma；
According to the CDF value Pr, the default PAPR threshold gamma and default amplitude limit value calculation formula:
Obtain the clipping of companding function
Value A,
Wherein,K indicates the slope of companding function, and k is according to before companding and after companding
Average power signal conservation formula obtains, and k > 1, e indicate Irrational Number e, and σ indicates the variance of the ofdm signal；
According to the amplitude limit value A, the companding function is obtained:X indicates the width of the ofdm signal
Angle value, y indicate to carry out the ofdm signal range value after companding；
Companding is carried out to the ofdm signal according to the companding function, the ofdm signal after obtaining companding.
Optionally, companding is carried out to the ofdm signal according to the companding function described, the OFDM after obtaining companding
After signal, the method also includes:
According to mean square error formula:
OFDM after calculating the companding
The power mean square error of signal Erf (A) indicates the error function of amplitude limit value A, xnTable
Show the range value of n-th of sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding, σ2Described in expression
The mean power of ofdm signal；
IfGreater than default error threshold, the amplitude limit value A is updated, the amplitude limit value A ' updated makes basis
The power mean square error that the amplitude limit value A ' of the update is obtainedNo more than the default error threshold；
According to the amplitude limit value A ' of the update, the companding function is updated, the companding function updated:
Companding is carried out to the ofdm signal according to the companding function of the update, the OFDM letter after the companding updated
Number.
Optionally, the determination method of the default amplitude limit value calculation formula, comprising:
According toIt obtainsThe CDF value Pr indicates each sampling point signal
PAPR≤default PAPR threshold gamma probability, P { } indicate probability operator, σ2Indicate the mean power of the ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
Optionally, the method for suppressing peak to average ratio of the embodiment of the present invention, further includes:
According to before companding and companding after average power signal conservation formula:And
The companding function:It obtains
Wherein, f (x) is the probability distributing density function of the range value x obedience of the ofdm signal,σ2Indicate the mean power of the ofdm signal.
The embodiment of the invention provides a kind of peak-to-average force ratios to inhibit device, and described device includes:
CDF value computing module, for according to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN=B,
Cumulative Distribution Function CDF value Pr is calculated, N indicates the number of samples of OFDM signal, PrNIndicate the ofdm signal
Peak-to-average force ratio PAPR≤default PAPR threshold gamma probability；
Amplitude limit value computing module, based on according to the CDF value Pr, the default PAPR threshold gamma and default amplitude limit value
Calculate formula:
Obtain the clipping of companding function
Value A,
Wherein,K indicates the slope of companding function, and k is according to before companding and after companding
Average power signal conservation formula obtains, and k > 1, e indicate Irrational Number e, and σ indicates the variance of the ofdm signal；
Companding function determination module, for obtaining the companding function according to the amplitude limit value A:
X indicates that the range value of the ofdm signal, y indicate to carry out the ofdm signal range value after companding；
Signal companding module, for carrying out companding to the ofdm signal according to the companding function, after obtaining companding
Ofdm signal.
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Mean square error computing module, for according to mean square error formula:
OFDM after calculating the companding
The power mean square error of signal Erf (A) indicates the error function of amplitude limit value A, xnTable
Show the range value of n-th of sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding, σ2Described in expression
The mean power of ofdm signal；
Amplitude limit value update module, if forGreater than default error threshold, the amplitude limit value A is updated, is obtained more
New amplitude limit value A ' makes the power mean square error obtained according to the amplitude limit value A ' of the updateNo more than the default error
Threshold value；
Companding function update module is updated the companding function, obtains for the amplitude limit value A ' according to the update
To the companding function of update:
Again companding module obtains more for carrying out companding to the ofdm signal according to the companding function of the update
Ofdm signal after new companding.
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Default amplitude limit value calculation formula determining module, is used for basisIt obtainsCDF value Pr indicates that PAPR≤default PAPR threshold gamma probability of each sampling point signal, P { } indicate
Probability operator, σ2Indicate the mean power of the ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Slope and amplitude limit value relationship determination module, for according to average power signal conservation formula before companding and after companding:And the companding function:Obtain slope k and amplitude limit value A
Meet formula:
Wherein, f (x) is the probability distributing density function of the range value x obedience of the ofdm signal,σ2Indicate the mean power of the ofdm signal.
The embodiment of the invention provides a kind of electronic equipment, comprising: processor, communication interface, memory and communication bus,
Wherein, the processor, the communication interface, the memory complete mutual communication by the communication bus；
The memory, for storing computer program；
The processor when for executing the program stored on the memory, realizes that any of the above-described peak is equal
The step of than suppressing method.
The embodiment of the invention provides a kind of computer readable storage medium, storage in the computer readable storage medium
There is computer program, when the computer program is executed by processor, realizes any of the above-described method for suppressing peak to average ratio
Step.
Technical solution provided in an embodiment of the present invention can include the following benefits, is meeting default CCDF value and is presetting
In the case where PAPR threshold value, the amplitude limit value of companding function is calculated by presetting amplitude limit value calculation formula, and obtain according to amplitude limit value
To companding function.Since the companding function of the embodiment of the present application can carry out clipping to the biggish ofdm signal of range value, to width
The lesser ofdm signal of angle value is expanded, and makes equal with the mean power of the ofdm signal after companding before companding, is being reduced
While the PAPR threshold value of ofdm signal, the distortion of ofdm signal can reduce.Certainly, it implements any of the products of the present invention or square
Method does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the method for suppressing peak to average ratio of the embodiment of the present invention；
The default PAPR threshold value and mean square error that Fig. 2 is the embodiment of the present invention are respectively with the change curve of amplitude limit value；
Fig. 3 is another flow chart of the method for suppressing peak to average ratio of the embodiment of the present invention；
Fig. 4 is that the peak-to-average force ratio of the embodiment of the present invention inhibits the structure chart of device；
Fig. 5 is the structure chart of the electronic equipment of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of the method for suppressing peak to average ratio of the embodiment of the present invention, comprising the following steps:
S101, according to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN=B calculates cumulative distribution
Function CDF value Pr, N indicate the number of samples of ofdm signal, PrNIndicate that PAPR≤default PAPR threshold gamma of ofdm signal is general
Rate.
Specifically, complementary Cumulative Distribution Function indicates that peak to average is more than a certain preset threshold (this Shen in signal transmission system
Please be default PAPR threshold gamma in embodiment) probability, preset CCDF value B and indicate in ofdm signal that peak-to-average force ratio is greater than and preset PAPR
The probability of threshold gamma, ofdm signal can be the time-domain signal after inverse fast Fourier transform.The PAPR of ofdm signal
It can indicate are as follows:
xnIndicate that the range value of n-th of sampling point signal, E () are to ask several
Learn desired operator.
In ofdm signal, peak-to-average force ratio PAPR≤default PAPR threshold gamma probability of ofdm signal refers to all sampling point letters
Number instantaneous power and the ratio of mean power be both less than the probability of γ.Since before companding, all sampling point signals are independent same
Distribution, so, after companding, all sampling point signals are also independent identically distributed.PrNThe PAPR of expression ofdm signal≤pre-
If the probability of PAPR threshold gamma, Pr indicates PAPR≤default PAPR threshold gamma probability of each sampling point signal.
In the embodiment of the present invention, default CCDF value B can be set according to different QoS requirements, for example, can
Think 10-4、10-3、10-2Deng.Under normal conditions, PAPR threshold value refers to initial p APR threshold gamma0, can be according to formula: 10*
Lg γ=γ0, to γ0It is handled, obtains the default PAPR threshold gamma of the embodiment of the present invention, that is to say, that the embodiment of the present invention
Default PAPR threshold gamma be processing after value.
For example, when the subcarrier N of ofdm signal is 64, it is desirable that initial p APR is more than the probability of 5dB not higher than 10-4.This
When, γ0=5dB, 10*lg γ=5, CCDF value B=10-4, 1-Pr64=10-4, therefore can be in the hope of the value of Pr.
S102, according to CDF value Pr, default PAPR threshold gamma and default amplitude limit value calculation formula:
Obtain the clipping of companding function
Value A,
Wherein,K indicates the slope of companding function, and k is according to before companding and after companding
Average power signal conservation formula obtains, and k > 1, e indicate Irrational Number e, and σ indicates the variance of ofdm signal.
In the embodiment of the present invention, due to the mean power conservation before companding with ofdm signal after companding, can basis
Before companding and companding after average power signal conservation formula:And companding function:It obtains
Wherein, f (x) is the probability distributing density function of the range value x obedience of ofdm signal, in ofdm signal, time domain
Signal Rayleigh distributed, i.e.,σ2Indicate the mean power of ofdm signal.
Since CDF value Pr can be obtained according to S101, it is known for presetting PAPR threshold gamma, then according to amplitude limit value is preset
Calculation formula, the amplitude limit value A of available companding function.The determination method of default amplitude limit value calculation formula, comprising:
According toIt obtainsCDF value Pr indicates the PAPR of each sampling point signal
The probability of≤default PAPR threshold gamma, P { } indicate probability operator, σ2Indicate the mean power of ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
In addition, default PAPR threshold gamma and the relationship of amplitude limit value A can be drawn by MATLAB software, reference can be made to Fig. 2, in reality
In the setting of the amplitude limit value A on border, due to more complicated by the default anti-process for solving amplitude limit value A of amplitude limit value calculation formula,
Amplitude limit value A can be set according to fig. 2.For example, amplitude limit value A can be set to 2 when default PAPR threshold gamma is 3.98.
S103 obtains companding function according to amplitude limit value A:X indicates the range value of ofdm signal, y
It indicates to carry out ofdm signal the range value after companding.
Specifically, after obtaining amplitude limit value A, according toThe value of k is obtained, and then is obtained
To companding function.
S104 carries out companding to ofdm signal according to companding function, the ofdm signal after obtaining companding.
Specifically, the range value of ofdm signal is set as A, the phase of ofdm signal if the range value of ofdm signal is greater than A
Invariant position；If the range value of ofdm signal is not more than A, the range value of ofdm signal is extended to k times, the phase of ofdm signal is not
Become.
In addition, since companding function is used in the transmitting terminal of ofdm system, that is, transmitting terminal can carry out ofdm signal
After companding, the ofdm signal after companding is sent to receiving end, receiving end can carry out the ofdm signal after received companding
Solve companding.
The method for suppressing peak to average ratio of the embodiment of the present invention, in the case where meeting default CCDF value and default PAPR threshold value,
The amplitude limit value of companding function is calculated by presetting amplitude limit value calculation formula, and companding function is obtained according to amplitude limit value.Due to this
The companding function of application embodiment is linear plus clipping function, it can clipping is carried out to the biggish ofdm signal of range value,
The lesser ofdm signal of range value is expanded, make it is equal with the mean power of the ofdm signal after companding before companding, therefore,
While reducing the PAPR threshold value of ofdm signal, the distortion of ofdm signal can reduce.
Referring to Fig. 3, Fig. 3 is another flow chart of the method for suppressing peak to average ratio of the embodiment of the present invention, in Fig. 1 embodiment
It is further comprising the steps of after S104:
S301, according to mean square error formula:
Ofdm signal after calculating companding
Power mean square error Erf (A) indicates the error function of amplitude limit value A, xnIndicate n-th
The range value of a sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding.
In the embodiment of the present invention, when default PAPR threshold gamma requires lower, corresponding amplitude limit value A also can be reduced accordingly,
Corresponding MSE (mean-square error, mean square error) will be increased.At this point it is possible to preferentially guarantee the MSE of ofdm signal,
And under the premise of guaranteeing MSE, the smallest amplitude limit value A is found, to guarantee the PAPR of ofdm signal as far as possible.It therefore, can be with
The power mean square error of ofdm signal after calculating companding according to mean square error formula
S302, judgementWhether default error threshold is greater than.
In this step, ifOFDM letter greater than default error threshold, after showing the companding obtained by companding function
It is number larger, it is unsatisfactory for requiring, executes S203.Otherwise, the ofdm signal satisfaction after showing the companding obtained by companding function is wanted
It asks, that is to say, that the companding function is available.Default error threshold is the value being arranged according to different communication quality requirement, herein
Without limitation.
S303 is updated amplitude limit value A, the amplitude limit value A ' updated, makes to be obtained according to the amplitude limit value A ' of update
Power mean square errorNo more than default error threshold.
Specifically, obtained MSE is bigger as previously mentioned, amplitude limit value A is smaller, then, when being updated to amplitude limit value A,
The size that amplitude limit value A can be increased recalculates power mean square error according to the size after increaseIf conditions are not met, after
The continuous size for increasing amplitude limit value A, until power mean square errorNo more than default error threshold.That is, making to finally obtain
Update amplitude limit value A ' it is small as far as possible, and meet power mean square errorNo more than default error threshold.It therefore, can be with
The relation curve of MSE and amplitude limit value A are drawn in Fig. 2 simultaneously, ifGreater than default error threshold, can preferentially guarantee
Then MSE determines the amplitude limit value A ' updated according to the relation curve of MSE and amplitude limit value A.For example, if default error threshold is
0.0001, when amplitude limit value A is 2, obtained power mean square errorIt is 0.01, is greater than default error threshold 0.0001, because
This is needed according to the relation curve for presetting error threshold 0.0001 and MSE and amplitude limit value A, and the amplitude limit value A ' updated is
2.6。
S304 is updated companding function according to the amplitude limit value A ' of update, the companding function updated:
S305 carries out companding to ofdm signal according to the companding function of update, the ofdm signal after the companding updated.
As it can be seen that the method for suppressing peak to average ratio of the embodiment of the present application, pays the utmost attention to the PAPR of ofdm signal, according to default PAPR
Threshold gamma calculates amplitude limit value A, then, calculates power mean square error according to amplitude limit value A?When undesirable, then root
Amplitude limit value A is determined according to the relation curve of MSE and amplitude limit value A.At this point, preferentially guaranteeing the MSE of signal, and in the premise for guaranteeing MSE
Under, the smallest amplitude limit value A is found, to guarantee the PAPR of signal as far as possible.
Corresponding to above method embodiment, the embodiment of the invention provides a kind of peak-to-average force ratios to inhibit device, referring to fig. 4, Fig. 4
Inhibit the structure chart of device for the peak-to-average force ratio of the embodiment of the present invention, comprising:
CDF value computing module 401, for according to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN
=B, calculates Cumulative Distribution Function CDF value Pr, and N indicates the number of samples of OFDM signal, PrNIndicate ofdm signal
PAPR≤default PAPR threshold gamma probability；
Amplitude limit value computing module 402, it is public for being calculated according to CDF value Pr, default PAPR threshold gamma and default amplitude limit value
Formula:
Obtain the clipping of companding function
Value A,
Wherein,K indicates the slope of companding function, and k > 1, k are according to before companding and pressing
Average power signal conservation formula obtains after expansion, and e indicates Irrational Number e, and σ indicates the variance of ofdm signal；
Companding function determination module 403, for obtaining companding function according to amplitude limit value A:X is indicated
The range value of ofdm signal, y indicate to carry out ofdm signal the range value after companding；
Signal companding module 404, the OFDM letter for carrying out companding to ofdm signal according to companding function, after obtaining companding
Number.
The peak-to-average force ratio of the embodiment of the present invention inhibits device, in the case where meeting default CCDF value and default PAPR threshold value,
The amplitude limit value of companding function is calculated by presetting amplitude limit value calculation formula, and companding function is obtained according to amplitude limit value.Due to this
The companding function of application embodiment is linear plus clipping function, it can clipping is carried out to the biggish ofdm signal of range value,
The lesser ofdm signal of range value is expanded, make it is equal with the mean power of the ofdm signal after companding before companding, therefore,
While reducing the PAPR threshold value of ofdm signal, the distortion of ofdm signal can reduce.
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Mean square error computing module, for according to mean square error formula:
Ofdm signal after calculating companding
Power mean square error Erf (A) indicates the error function of amplitude limit value A, xnIndicate n-th
The range value of a sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding,；
Amplitude limit value update module, if forGreater than default error threshold, amplitude limit value A is updated, is updated
Amplitude limit value A ' makes the power mean square error obtained according to the amplitude limit value A ' of updateNo more than default error threshold, σ2It indicates
The mean power of ofdm signal；
Companding function update module is updated companding function, is updated for the amplitude limit value A ' according to update
Companding function:
Again companding module, for carrying out companding, the companding updated to ofdm signal according to the companding function of update
Ofdm signal afterwards.
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Default amplitude limit value calculation formula determining module, is used for basisIt obtainsCDF value Pr indicates that PAPR≤default PAPR threshold gamma probability of each sampling point signal, P { } indicate
Probability operator, σ2Indicate the mean power of the ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
Optionally, the peak-to-average force ratio of the embodiment of the present invention inhibits device, further includes:
Slope and amplitude limit value relationship determination module, for according to average power signal conservation formula before companding and after companding:And companding function:It obtains slope k and amplitude limit value A meets
Formula:
Wherein, f (x) is the probability distributing density function of the range value x obedience of ofdm signal,σ2
Indicate the mean power of ofdm signal.
About the device in above-described embodiment, wherein modules execute the concrete mode of operation in related this method
Embodiment in be described in detail, no detailed explanation will be given here.
The embodiment of the invention also provides a kind of electronic equipment, are the electronic equipment of the embodiment of the present invention referring to Fig. 5, Fig. 5
Structure chart, comprising: processor 501, communication interface 502, memory 503 and communication bus 504, wherein processor 501, logical
Letter interface 502, memory 503 complete mutual communication by communication bus 504；
Memory 503, for storing computer program；
Processor 501 when for executing the program stored on memory 503, realizes any of the above-described peak-to-average force ratio inhibition side
The step of method.
It should be noted that the communication bus 504 that above-mentioned electronic equipment is mentioned can be PCI (Peripheral
Component Interconnect, Peripheral Component Interconnect standard) bus or EISA (Extended Industry Standard
Architecture, expanding the industrial standard structure) bus etc..The communication bus 504 can be divided into address bus, data/address bus,
Control bus etc..Only to be indicated with a thick line in Fig. 5, it is not intended that an only bus or a seed type convenient for indicating
Bus.
Communication interface 502 is for the communication between above-mentioned electronic equipment and other equipment.
Memory 503 may include RAM (Random Access Memory, random access memory), also may include
Nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.Optionally, memory may be used also
To be storage device that at least one is located remotely from aforementioned processor.
Above-mentioned processor 501 can be general processor, comprising: CPU (Central Processing Unit, center
Processor), NP (Network Processor, network processing unit) etc.；It can also be DSP (Digital Signal
Processing, digital signal processor), ASIC (Application Specific Integrated Circuit, it is dedicated
Integrated circuit), FPGA (Field-Programmable Gate Array, field programmable gate array) or other are programmable
Logical device, discrete gate or transistor logic, discrete hardware components.
In the electronic equipment of the embodiment of the present invention, processor is pre- meeting by executing the program stored on memory
If in the case where CCDF value and default PAPR threshold value, the amplitude limit value of companding function is calculated by presetting amplitude limit value calculation formula, and
And companding function is obtained according to amplitude limit value.Since the companding function of the embodiment of the present application is linear plus clipping function, it can
Clipping is carried out to the biggish ofdm signal of range value, the lesser ofdm signal of range value is expanded, is made before companding and companding
The mean power of ofdm signal afterwards is equal, therefore, while reducing the PAPR threshold value of ofdm signal, can reduce OFDM letter
Number distortion.
The embodiment of the invention also provides a kind of computer readable storage medium, it is stored in computer readable storage medium
Computer program, when computer program is executed by processor, the step of realizing any of the above-described method for suppressing peak to average ratio.
It is pre- meeting when the instruction stored in the computer readable storage medium of the embodiment of the present invention is run on computers
If in the case where CCDF value and default PAPR threshold value, the amplitude limit value of companding function is calculated by presetting amplitude limit value calculation formula, and
And companding function is obtained according to amplitude limit value.Since the companding function of the embodiment of the present application is linear plus clipping function, it can
Clipping is carried out to the biggish ofdm signal of range value, the lesser ofdm signal of range value is expanded, is made before companding and companding
The mean power of ofdm signal afterwards is equal, therefore, while reducing the PAPR threshold value of ofdm signal, can reduce OFDM letter
Number distortion.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device,
For electronic equipment and readable storage medium storing program for executing embodiment, since it is substantially similar to the method embodiment, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of method for suppressing peak to average ratio, which is characterized in that the described method includes:
According to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN=B calculates Cumulative Distribution Function CDF value
Pr, N indicate the number of samples of OFDM signal, PrNIndicate the peak-to-average force ratio PAPR of the ofdm signal≤default
The probability of PAPR threshold gamma；
According to the CDF value Pr, the default PAPR threshold gamma and default amplitude limit value calculation formula:
The amplitude limit value A of companding function is obtained,
Wherein,K indicates the slope of companding function, and k is according to signal is flat before companding and after companding
Equal power conservation formula obtains, and k > 1, e indicate Irrational Number e, and σ indicates the variance of the ofdm signal；
According to the amplitude limit value A, the companding function is obtained:X indicates the amplitude of the ofdm signal
Value, y indicate to carry out the ofdm signal range value after companding；
Companding is carried out to the ofdm signal according to the companding function, the ofdm signal after obtaining companding.
2. method for suppressing peak to average ratio according to claim 1, which is characterized in that it is described according to the companding function to institute
It states ofdm signal and carries out companding, after the ofdm signal after obtaining companding, the method also includes:
According to mean square error formula:
Ofdm signal after calculating the companding
Power mean square error Erf (A) indicates the error function of amplitude limit value A, xnIt indicates n-th
The range value of sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding, σ2Indicate the OFDM letter
Number mean power；
IfGreater than default error threshold, the amplitude limit value A is updated, the amplitude limit value A ' updated makes according to
The power mean square error that the amplitude limit value A ' of update is obtainedNo more than the default error threshold；
According to the amplitude limit value A ' of the update, the companding function is updated, the companding function updated:
Companding is carried out to the ofdm signal according to the companding function of the update, the ofdm signal after the companding updated.
3. method for suppressing peak to average ratio according to claim 1, which is characterized in that the default amplitude limit value calculation formula is really
Determine method, comprising:
According toIt obtainsThe CDF value Pr indicates the PAPR of each sampling point signal
The probability of≤default PAPR threshold gamma, P { } indicate probability operator, σ2Indicate the mean power of the ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
4. method for suppressing peak to average ratio according to claim 1, which is characterized in that the method also includes:
According to before companding and companding after average power signal conservation formula:And it is described
Companding function:It obtains
Wherein, f (x) is the probability distributing density function of the range value x obedience of the ofdm signal,σ2
Indicate the mean power of the ofdm signal.
5. a kind of peak-to-average force ratio inhibits device, which is characterized in that described device includes:
CDF value computing module, for according to default complementary Cumulative Distribution Function CCDF value B and CCDF function: 1-PrN=B is calculated
Cumulative Distribution Function CDF value Pr, N indicate the number of samples of OFDM signal, PrNIndicate the peak of the ofdm signal
Than PAPR≤default PAPR threshold gamma probability；
Amplitude limit value computing module, it is public for being calculated according to the CDF value Pr, the default PAPR threshold gamma and default amplitude limit value
Formula:
The amplitude limit value A of companding function is obtained,
Wherein,K indicates the slope of companding function, and k is according to signal is flat before companding and after companding
Equal power conservation formula obtains, and k > 1, e indicate Irrational Number e, and σ indicates the variance of the ofdm signal；
Companding function determination module, for obtaining the companding function according to the amplitude limit value A:X table
Show that the range value of the ofdm signal, y indicate to carry out the ofdm signal range value after companding；
Signal companding module, for carrying out companding to the ofdm signal according to the companding function, the OFDM after obtaining companding
Signal.
6. peak-to-average force ratio according to claim 5 inhibits device, which is characterized in that described device further include:
Mean square error computing module, for according to mean square error formula:
Ofdm signal after calculating the companding
Power mean square error Erf (A) indicates the error function of amplitude limit value A, xnIt indicates n-th
The range value of sampling point signal, ynIt indicates to carry out n-th of sampling point signal the range value after companding, σ2Indicate the OFDM letter
Number mean power；
Amplitude limit value update module, if forGreater than default error threshold, the amplitude limit value A is updated, is updated
Amplitude limit value A ' makes the power mean square error obtained according to the amplitude limit value A ' of the updateNo more than the default error threshold；
Companding function update module is updated the companding function, obtains more for the amplitude limit value A ' according to the update
New companding function:
Again companding module is updated for carrying out companding to the ofdm signal according to the companding function of the update
Ofdm signal after companding.
7. peak-to-average force ratio according to claim 5 inhibits device, which is characterized in that described device further include:
Default amplitude limit value calculation formula determining module, is used for basisIt obtainsCDF
Value Pr indicates that PAPR≤default PAPR threshold gamma probability of each sampling point signal, P { } indicate probability operator, σ2Described in expression
The mean power of ofdm signal；
IfThen
IfThen
IfThen
IfThen
It obtains
8. peak-to-average force ratio according to claim 5 inhibits device, which is characterized in that described device further include:
Slope and amplitude limit value relationship determination module, for according to average power signal conservation formula before companding and after companding:And the companding function:Obtain slope k and amplitude limit value A
Meet formula:
Wherein, f (x) is the probability distributing density function of the range value x obedience of the ofdm signal,σ2
Indicate the mean power of the ofdm signal.
9. a kind of electronic equipment characterized by comprising processor, communication interface, memory and communication bus, wherein described
Processor, the communication interface, the memory complete mutual communication by the communication bus；
The memory, for storing computer program；
The processor when for executing the program stored on the memory, realizes that Claims 1 to 4 is any described
The step of method for suppressing peak to average ratio.
10. a kind of computer readable storage medium, which is characterized in that be stored with computer in the computer readable storage medium
Program when the computer program is executed by processor, realizes any method for suppressing peak to average ratio of Claims 1 to 4
Step.
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