CN108667760A - A kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system - Google Patents
A kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/262—Reduction thereof by selection of pilot symbols
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Abstract
The present invention relates to a kind of bandwidth conservation type peak-to-average force ratio suppression systems suitable for optical OFDM system, including sequentially connected transmitter, OFDM Electro-optical Modulations module, optical fiber transmission module, OFDM Photoelectric Detections module and receiver；Transmitter includes original signal serial to parallel conversion module, new constellation mapping block, pilot tone insertion module, training series is inserted into module, cyclic prefix is inserted into module, SLM methods select PAPR minimum values signaling module and parallel serial conversion module；Receiver includes serial to parallel conversion module, sign synchronization module, frequency synchronization module, fast Fourier transform module, pilot extraction and channel estimation module, channel equalization module, phase noise estimation and phase equalization module, calculates phase place vector and phase rotation module, phase is gone to estimate again and phase balance module, anti-mapping block, parallel serial conversion module and error code detection module again.The present invention can be effectively reduced error rate of system.
Description
Technical field
The present invention relates to a kind of bandwidth conservation type peak-to-average force ratio suppression systems suitable for optical OFDM system, belong to light orthogonal frequency
Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) system peak-to-average is divided to be led than suppression technology
Domain.
Background technology
Light orthogonal frequency division multiplexing (optical orthogonal frequency division multiplexing, O-
OFDM) system combines orthogonal frequency division multiplexing (the orthogonal frequency division in RF communication system
Multiplexing, OFDM) technology and the advantages of fiber optic communication.However, there are peak value average power ratios in optical OFDM system
The problem of (peak-to-average power ratio, PAPR).High PAPR drives high power amplifier in nonlinear area work
Make, this will increase inband distortion and out-of-band radiation, decline so as to cause O-OFDM system performances.In order to effectively inhibit height
For PAPR on being influenced caused by O-OFDM systems, current experts and scholars both domestic and external propose many solution party for high PAPR
Case, such as technologies such as slicing (Clipping), selected mapping method (selective mapping, SLM), partial transmission sequences.In mesh
In preceding solution, SLM is to inhibiting the more effective technologies of PAPR in probability class technology, because it will not cause in the transmission
Distorted signals more can significantly inhibit the appearance of high PAPR.But need to transmit side information in traditional SLM schemes,
This will increase system complexity and transmission delay, and reduce message transmission rate.
Invention content
The technical problem to be solved in the present invention is, for the above-mentioned high peak-to-average power ratio for inhibiting optical OFDM system existing at present
And the deficiency of error rate of system technical solution is reduced, a kind of bandwidth conservation type peak-to-average force ratio suppression suitable for optical OFDM system is provided
System processed not only without the SLM technologies that side information transmits but also can can take into account preferable PAPR rejections in user
Peak-to-average force ratio scheme, and error rate of system can be effectively reduced.
A kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system, including sequentially connected transmitter,
OFDM Electro-optical Modulations module, optical fiber transmission module, OFDM Photoelectric Detections module and receiver；
Transmitter includes original signal serial to parallel conversion module, new constellation mapping block, pilot tone is inserted into module, training series is inserted
Enter module, cyclic prefix is inserted into module, SLM methods select PAPR minimum values signaling module and parallel serial conversion module；
Receiver include serial to parallel conversion module, sign synchronization module, frequency synchronization module, fast Fourier transform module,
Pilot extraction and channel estimation module, channel equalization module, phase noise estimation and phase equalization module, calculate phase place to
Measure and go phase rotation module, phase to estimate that balance module, anti-mapping block, parallel serial conversion module and error code are examined again with phase again
Survey module.
Further, the function of each submodule is as follows in the transmitter：
The original signal serial to parallel conversion module is used to original serial digital signal serial to parallel conversion be parallel digital signal；
The new constellation mapping block is used to that the digital signal after serioparallel exchange to be passed through new constellation mapping according to different modulation numbers
For frequency-region signal；The pilot tone is inserted into module for being inserted into pilot tone in frequency-region signal；The training series is inserted into module and is used for
Training sequence is inserted into frequency-region signal；The cyclic prefix is inserted into module for being inserted into cyclic prefix in frequency-region signal；Institute
It states SLM methods selection PAPR minimum value signaling modules and is used for the signal using selected mapping method choice of technology PAPR minimum values using simultaneously
Row time-domain signal is transmitted；The parallel serial conversion module is used to parallel time-domain signal parallel serial conversion be serial time domain signal.
Further, the function of each submodule is as follows in the receiver：
The serial to parallel conversion module is used for serial time domain signal serial to parallel conversion parallel time-domain signal；The sign synchronization mould
Block is used to parallel time-domain signal carrying out sign synchronization, finds the place that ofdm signal starts；The frequency synchronization module is used for
Estimate symbol synchronize after time-domain signal frequency shift (FS), line frequency of going forward side by side synchronize；The fast Fourier transform module is used for
It is frequency-region signal that time-domain signal, which is carried out Fast Fourier Transform (FFT),；The pilot extraction and channel estimation module are for extracting frequency
The pilot tone of domain signal simultaneously carries out interchannel noise estimation；The channel equalization module is used to carry out channel equalization to frequency-region signal；Institute
Phase noise estimation is stated to be used to estimate the phase noise of frequency-region signal with phase equalization module and carry out phase equalization；The calculating
Phase place vector simultaneously goes phase rotation module for calculating the phase place vector that each ofdm signal uses, and phase is gone to revolve
Turn；The phase estimates that balance module is used to estimate the phase noise of frequency-region signal at this time and carries out phase again again with phase again
It is balanced；The anti-mapping block is used to penetrate signal reflection, is transformed to digital signal；The parallel serial conversion module is used for will be parallel
Digital signal parallel serial conversion serial digital signal；The error code detection module is believed for comparing this digital signal with original figure
Number, carry out error detection.
Further, the process for calculating phase place vector and phase rotation module is gone to calculate phase place vector
For：
S1, for each smooth OFDM symbol Y=[Y0,Y1,…,YN-1], wherein N is sub-carrier number, by Y difference divided by phase
Rotating vector Pu=[Pu(0),...,Pu(N-1)], (u=0,1 ..., U-1),
Wherein[0,2 π) in obey and be uniformly distributed, obtain U
S2, for eachIt calculatesTo the distance of each constellation point, take wherein distance minimum
Value：
S3, the mean square deviation of calculating at this time：
S4, it takes so that mean square deviation DuMinimumCorresponding phase place vector Pu, and make to use it to finally recover original
Beginning signal.
Further, the OFDM Electro-optical Modulation modules are for converting electrical signals to optical signal.
Further, the optical fiber transmission module is used for transmission optical signal.
Further, the OFDM Photoelectric Detection modules are for converting optical signals to electric signal.
Advantage of the invention is that：From theoretical and Computer Simulation it is found that the present invention can use traditional selectivity
Mapping techniques reduce PAPR under the premise of, side information need not be transmitted, you can save bandwidth, will not increase system complexity and
Transmission delay will not reduce message transmission rate.Meanwhile with the selected mapping method technology for having side information transmission with tradition
Essentially identical error rate of system.Therefore, the present invention in the high peak-to-average power ratio for inhibiting optical OFDM system and reduces error rate of system
Practical application kind have very high utility value and Practical significance.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the Technology Roadmap of the present invention；
Fig. 2 is the new constellation schematic diagram of the 4-QAM of the present invention；
Fig. 3 is the present invention has the CCDF of the selected mapping method technology of side information transmission to compare with tradition；
Fig. 4 is the bit error rate (L/KM) comparison diagram for the selected mapping method technology that the present invention has side information transmission with tradition；
Fig. 5 is the bit error rate (N) comparison diagram for the selected mapping method technology that the present invention has side information transmission with tradition.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
The specific implementation mode of the present invention.
A kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system, including sequentially connected transmitter,
OFDM Electro-optical Modulations module, optical fiber transmission module, OFDM Photoelectric Detections module and receiver；
Transmitter is inserted into module by original signal serial to parallel conversion module, new constellation mapping block, pilot tone, training series is inserted into
Module, cyclic prefix are inserted into module, SLM methods selection PAPR minimum values signaling module, parallel serial conversion module composition；
Receiver by serial to parallel conversion module, sign synchronization module, frequency synchronization module, fast Fourier transform module, lead
Frequency extraction and channel estimation module, channel equalization module, phase noise estimation and phase equalization module, calculating phase place vector
And phase rotation module, phase is gone to estimate again and phase balance module, anti-mapping block, parallel serial conversion module, error detection again
Module forms.
Original signal serial to parallel conversion module is used to original serial digital signal serial to parallel conversion be parallel digital signal；Nova
Seat mapping block is used to that the digital signal after serioparallel exchange to be mapped as frequency domain letter by new constellation according to different modulation numbers
Number；Pilot tone is inserted into module for being inserted into pilot tone in frequency-region signal；Training series is inserted into module for being inserted into frequency-region signal
Training sequence；Cyclic prefix is inserted into module for being inserted into cyclic prefix in frequency-region signal；SLM methods select PAPR minimum value signals
Module using the signal of traditional selected mapping method choice of technology PAPR minimum values for being transmitted；Parallel serial conversion module is used for
It is serial time domain signal by parallel time-domain signal parallel serial conversion；
Serial to parallel conversion module is used for serial time domain signal serial to parallel conversion parallel time-domain signal；Sign synchronization module is used for will
Time-domain signal carries out sign synchronization, finds the place that ofdm signal starts；Frequency synchronization module is used to estimate the frequency of time-domain signal
Rate deviates, and line frequency of going forward side by side synchronizes；Fast Fourier transform module is used to time-domain signal carrying out Fast Fourier Transform (FFT) to be frequency
Domain signal；Pilot extraction and channel estimation module are used to extract the pilot tone of frequency-region signal and carry out interchannel noise estimation；Channel
Balance module is used to carry out channel equalization to frequency-region signal；Phase noise is estimated with phase equalization module for estimating frequency-region signal
Phase noise and carry out phase equalization；It calculates phase place vector and goes phase rotation module for calculating each ofdm signal
The phase place vector used, and go phase place；Phase estimates that balance module is used to estimate frequency domain at this time again with phase again
The phase noise of signal and to carry out phase balanced again；Anti- mapping block is used to penetrate signal reflection, is transformed to digital signal；And it goes here and there
Conversion module is used for parallel digital signal parallel serial conversion serial digital signal；Error code detection module is for comparing this digital signal
With raw digital signal, error detection is carried out.
For OFDM Electro-optical Modulation modules for converting electrical signals to optical signal, optical fiber transmission module is used for transmission optical signal,
OFDM Photoelectric Detection modules are for converting optical signals to electric signal.
In conjunction with Fig. 1, the transmitting flow of transmitter is：
A. it is parallel digital signal by original serial digital signal serial to parallel conversion；
B. the digital signal after serioparallel exchange is mapped as frequency-region signal by new constellation according to different modulation numbers；Its
In, new mappings constellation is：
Wherein
In formula, K is the constellation point number of quadrature amplitude modulation,For the constellation point expression formula of original mappings constellation,
It indicatesImaginary part.
C. it is inserted into pilot tone in frequency-region signal, is mainly used for phase noise estimation；
D. it is inserted into training sequence in frequency-region signal, is mainly used for sign synchronization, Frequency Synchronization and channel estimation；
E. cyclic prefix is inserted into frequency-region signal；
F. it is passed using the signal of traditional selected mapping method technology (U phase place vector) selection PAPR minimum values
It is defeated, due to wherein thering is inverse fast fourier transform, signal to become time domain from frequency domain；
G. it is serial time domain signal by parallel time-domain signal parallel serial conversion.
The reception flow of receiver is：
A. by serial time domain signal serial to parallel conversion parallel time-domain signal；
B. time-domain signal is subjected to sign synchronization, finds the place that ofdm signal starts；
C. estimate that the frequency shift (FS) of time-domain signal, line frequency of going forward side by side synchronize；
D. it is frequency-region signal time-domain signal to be carried out Fast Fourier Transform (FFT)；
E. it extracts the pilot tone of frequency-region signal and carries out interchannel noise estimation；
F. channel equalization is carried out to frequency-region signal；
G. estimate the phase noise of frequency-region signal and carry out phase equalization；
H. the phase place vector that each ofdm signal uses is calculated, and goes phase place；Wherein, calculate phase place to
The process of amount is：
S1, for each smooth OFDM symbol Y=[Y0,Y1,…,YN_1], wherein N is sub-carrier number, by Y difference divided by phase
Rotating vector Pu=[Pu(0),...,Pu(N-1)], (u=0,1 ..., U-1),
Wherein[0,2 π) in obey and be uniformly distributed, obtain U
S2, for eachIt calculatesTo the distance of each constellation point, take wherein distance minimum
Value：
S3, the mean square deviation of calculating at this time：
S4, it takes so that mean square deviation DuMinimumCorresponding phase place vector Pu, and make to use it to finally recover original
Beginning signal.
I. estimate the phase noise of frequency-region signal at this time and to carry out phase balanced again；
J. signal reflection is penetrated, is transformed into digital signal；
K. by parallel digital signal parallel serial conversion serial digital signal；
L. this digital signal and raw digital signal are compared, error detection is carried out.
The expression of traditional K ranks QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) constellation
Formula such as formula 1.
In formula 1, K is constellation point number, that is, order of modulation of quadrature amplitude modulation,For the constellation point of original mappings constellation
Expression formula.When K is 4, then C1={ 1+j, -1+j, -1-j, 1-j }, works as C1It is revolved with the phase in traditional selected mapping method technology
TransposonWhen multiplication, formula 2 can be obtained.
Similarly, work as C2Phase rotation coefficientWhen multiplication, formula 3 can be obtained.
We can clearly be inferred to, and if only if | θ1-θ2When |=n pi/2s (n is integer),
If this explanation does not send additional side information, receiving terminal cannot detect correct phase rotation coefficient.
The expression formula of the new constellation of the present invention such as formula 4.
Wherein
In formula 1, K is constellation point number, that is, order of modulation of quadrature amplitude modulation,For original mappings constellation
Constellation point expression formula,It indicatesImaginary part.
It is illustrated in combination with fig. 2, the new constellation expression formula such as formula 5 of 4-QAM.
In formula 2Work as C2With the phase rotation coefficient in traditional selected mapping method technologyPhase
It takes the opportunity, formula 6 can be obtained.
Similarly, work as C2Phase rotation coefficientWhen multiplication, formula 7 can be obtained.
Can clearly it be inferred to, and if only if | θ1-θ2When |=2n π (n is integer),And because
θ in phase rotation coefficienti∈ [0,2 π] (i=1,2), it is known that 0≤| θ1-θ2| 2 π of ＜.Therefore, and if only if θ1=θ2,This means that corresponding phase rotation coefficient is same at this time.Therefore, transmitter can accurately be recovered
Phase place vector used in each OFDM symbol.
It is illustrated in conjunction with Fig. 3, it can be seen from the figure that when sub-carrier number is identical as phase place vector number, this
Invention (black squares) has the CCDF of selected mapping method technology (black diamonds) two schemes of side information transmission with tradition
Curve.The peak-to-average ratio inhibition performance that the present invention is realized is identical with the selected mapping method technology that tradition has side information to transmit.
It is illustrated in conjunction with Fig. 4, it can be seen from the figure that when OFDM symbol number, sub-carrier number and phase place vector
When number is identical, (triangle on black) of the invention has the selected mapping method technology (black circles) two that side information transmits with tradition
Kind scheme changes with transmission range (L/KM) and bit error rate (BitBER=lg (BER)) curve of variation.The present invention's
BitBER performances and the selected mapping method technology that tradition has side information to transmit are essentially identical.
It is illustrated in conjunction with Fig. 5, it can be seen from the figure that when OFDM symbol number, transmission range and phase place vector
When number is identical, (triangle on black) of the invention has the selected mapping method technology (black circles) two that side information transmits with tradition
Kind scheme changes with sub-carrier number (N) and bit error rate (BitBER=lg (BER)) curve of variation.The BitBER of the present invention
Performance and the selected mapping method technology that tradition has side information to transmit are essentially identical.
Compare patent document《A kind of ADO-OFDM system peak-to-average ratios inhibition side based on selected mapping method and companding transform
Method》With《A kind of improved LC-SLM peak-to-average force ratios Restrain measurement of joint in optical OFDM system》, the present invention provides a kind of new constellations
The method of mapping is accorded with by using the calculating process provided by the invention in receiver end to calculate each OFDM of emitter terminals
Corresponding phase place vector used in number, and original signal is recovered with this, that is, realize no side information transmission.
In conclusion the present invention, which is one kind, can not only reduce peak-to-average force ratio (PAPR) and the bit error rate, and volume need not be transmitted
Outer side information (can save bandwidth, will not increase system complexity and transmission delay, will not reduce data transmission speed
Rate) peak-to-average force ratio suppression system.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited in above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (7)
1. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system, it is characterised in that：Including being sequentially connected
Transmitter, OFDM Electro-optical Modulations module, optical fiber transmission module, OFDM Photoelectric Detections module and receiver；
Transmitter includes original signal serial to parallel conversion module, new constellation mapping block, pilot tone is inserted into module, training series is inserted into mould
Block, cyclic prefix are inserted into module, SLM methods selection PAPR minimum values signaling module and parallel serial conversion module；
Receiver includes serial to parallel conversion module, sign synchronization module, frequency synchronization module, fast Fourier transform module, pilot tone
Extraction and channel estimation module, channel equalization module, phase noise estimation and phase equalization module calculate phase place vector simultaneously
Phase rotation module, phase is gone to estimate again and phase balance module, anti-mapping block, parallel serial conversion module and error detection mould again
Block.
2. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 1, special
Sign is that the function of each submodule is as follows in the transmitter：
The original signal serial to parallel conversion module is used to original serial digital signal serial to parallel conversion be parallel digital signal；It is described
New constellation mapping block is used to that the digital signal after serioparallel exchange to be mapped as frequency by new constellation according to different modulation numbers
Domain signal；The pilot tone is inserted into module for being inserted into pilot tone in frequency-region signal；The training series is inserted into module and is used in frequency
It is inserted into training sequence in the signal of domain；The cyclic prefix is inserted into module for being inserted into cyclic prefix in frequency-region signal；The SLM
When method selects PAPR minimum value signaling modules to be used to use parallel using the signal of selected mapping method choice of technology PAPR minimum values
Domain signal is transmitted；The parallel serial conversion module is used to parallel time-domain signal parallel serial conversion be serial time domain signal.
3. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 1, special
Sign is that the function of each submodule is as follows in the receiver：
The serial to parallel conversion module is used for serial time domain signal serial to parallel conversion parallel time-domain signal；The sign synchronization module is used
In parallel time-domain signal is carried out sign synchronization, the place that ofdm signal starts is found；The frequency synchronization module is for estimating
The frequency shift (FS) of time-domain signal after sign synchronization, line frequency of going forward side by side synchronize；The fast Fourier transform module be used for by when
It is frequency-region signal that domain signal, which carries out Fast Fourier Transform (FFT),；The pilot extraction and channel estimation module are for extracting frequency domain letter
Number pilot tone and carry out interchannel noise estimation；The channel equalization module is used to carry out channel equalization to frequency-region signal；The phase
Position noise estimation is used to estimate the phase noise of frequency-region signal with phase equalization module and carries out phase equalization；The calculating phase
Rotating vector simultaneously goes phase rotation module for calculating the phase place vector that each ofdm signal uses, and goes phase place；
The phase estimates that balance module is used to estimate the phase noise of frequency-region signal at this time again and to carry out phase equal again with phase again
Weighing apparatus；The anti-mapping block is used to penetrate signal reflection, is transformed to digital signal；The parallel serial conversion module is used for simultaneously line number
Word signal parallel serial conversion serial digital signal；The error code detection module is used to compare this digital signal and raw digital signal,
Carry out error detection.
4. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 3, special
Sign is that the process for calculating phase place vector and phase rotation module being gone to calculate phase place vector is：
S1, for each smooth OFDM symbol Y=[Y0,Y1,…,YN-1], wherein N is sub-carrier number, by Y difference divided by phase place
Vectorial Pu=[Pu(0),...,Pu(N-1)], (u=0,1 ..., U-1),Wherein[0,2 π) in obey and be uniformly distributed, obtain U
S2, for eachIt calculatesTo the distance of each constellation point, take wherein apart from minimum value：
S3, the mean square deviation of calculating at this time：
S4, it takes so that mean square deviation DuMinimumCorresponding phase place vector Pu, and make to use it to finally to recover original letter
Number.
5. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 1, special
Sign is that the OFDM Electro-optical Modulation modules are for converting electrical signals to optical signal.
6. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 1, special
Sign is that the optical fiber transmission module is used for transmission optical signal.
7. a kind of bandwidth conservation type peak-to-average force ratio suppression system suitable for optical OFDM system according to claim 1, special
Sign is that the OFDM Photoelectric Detection modules are for converting optical signals to electric signal.
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| CN109274433A (en) * | 2018-10-31 | 2019-01-25 | 重庆邮电大学 | A kind of fusion zero forcing algorithm and the novel phase noise compensation scheme from elimination algorithm in CO-OFDM system |
| CN109639617A (en) * | 2019-01-21 | 2019-04-16 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on APTS technology inhibits system |
| CN109672642A (en) * | 2019-01-21 | 2019-04-23 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on RPTS technology inhibits system |
| CN109889463A (en) * | 2019-01-21 | 2019-06-14 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on IPTS technology inhibits system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109274433A (en) * | 2018-10-31 | 2019-01-25 | 重庆邮电大学 | A kind of fusion zero forcing algorithm and the novel phase noise compensation scheme from elimination algorithm in CO-OFDM system |
| CN109639617A (en) * | 2019-01-21 | 2019-04-16 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on APTS technology inhibits system |
| CN109672642A (en) * | 2019-01-21 | 2019-04-23 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on RPTS technology inhibits system |
| CN109889463A (en) * | 2019-01-21 | 2019-06-14 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on IPTS technology inhibits system |
| CN110149295A (en) * | 2019-05-27 | 2019-08-20 | 深圳信息职业技术学院 | A method of companding transform United Technologies are spread and normalized based on DFT reduces P-OFDM system PAPR |
| CN112887251A (en) * | 2021-01-27 | 2021-06-01 | 湖南国科锐承电子科技有限公司 | Low-complexity PAPR (peak-to-average power ratio) suppression method in OFDM (orthogonal frequency division multiplexing) transmission system |
| CN112887251B (en) * | 2021-01-27 | 2022-07-01 | 湖南国科锐承电子科技有限公司 | Low-complexity PAPR (Peak to average Power ratio) suppression method in OFDM (orthogonal frequency division multiplexing) transmission system |
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