CN108696469A - A kind of OCML-SLM-RCF methods, equipment and storage device reducing OFDM non-linear distortion peak-to-average force ratios - Google Patents
A kind of OCML-SLM-RCF methods, equipment and storage device reducing OFDM non-linear distortion peak-to-average force ratios 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
- H04L27/2615—Reduction thereof using coding
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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
- H04L27/2623—Reduction thereof by clipping
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Abstract
The present invention provides a kind of OCML-SLM-RCF methods, equipment and storage devices reducing OFDM non-linear distortion peak-to-average force ratios, and the method comprising the steps of:Transmitting terminal generates ofdm signal;Calculate scrambler sequence array size needed for SLM algorithms;The ofdm signal that transmitting terminal is generated, which is inserted into SLM algorithms, modulates mapping;Generate OCML scrambler sequences;Required OCML scrambler sequences are inserted into the ofdm signal by SLM algorithm process obtained in SLM algorithms using OCML as scrambler sequence according to required array size, are denoted as OCML-SLM signals;OCML-SLM signals are chosen after an optimal sequence is iterated limit filtration processing and obtain OCML-SLM-RCF signals;Optimal sequence is pre-processed to obtain pretreated OCML-SLM-RCF sequences after choosing an iteration to OCML-SLM-RCF signals.The present invention can improve the performance of ofdm system.
Description
Technical field
The present invention relates to ofdm communication technical fields, and in particular to a kind of to reduce OFDM non-linear distortion peak-to-average force ratios
OCML-SLM-RCF methods, equipment and storage device.
Background technology
With the development of science and technology and people's living standards continue to improve, daily work of the wireless communication technique in people
Make and plays increasingly important role in living.Because OFDM has the energy of good noise robustness and anti-multipath channel disturbance
Power and high spectrum utilization, the application in broadband field have prodigious potentiality.But the most important disadvantage of ofdm system
It is exactly peak-to-average power (PAPR) than excessively high, and the non-linear distortion of signal is then to generate peak-to-average power (PAPA) to compare
One of high reason.Therefore, it is very necessary to the non-linear distortion of signal in ofdm system improve.Currently, domestic
Outer there are many kinds of different methods for reducing ofdm system PAPR, wherein having than more typical algorithm:Margining amplitude technique, selectivity are reflected
Penetrate method (SLM), partial transmission sequence (PTS) etc..Since amplitude limit is a nonlinear distortion process, can bring in serious band
Noise and out-of-band interference reduce the bit error rate performance and spectrum efficiency of whole system.And SLM is carried by introducing small redundancy
The statistical property of high PAPR will not cause signal distortion although it is a linear process, it cannot be avoided in system completely
High peak valve signal.Therefore it finds a kind of in-band noise and out-of-band interference is smaller and can effectively avoid high peak valve signal in system
Method is our urgent problems to be solved.
Invention content
The technical problem to be solved in the present invention is, for the peak averaging work(of ofdm communication system in existing communication field
Technological deficiency of the rate (PAPR) than will appear high peak valve signal in excessively high and SLM system, it is non-linear to provide a kind of reduction OFDM
It is distorted OCML-SLM-RCF methods, equipment and the storage device of peak-to-average force ratio.
The technical solution adopted by the present invention to solve the technical problems is:It is equal to construct a kind of reduction OFDM non-linear distortions peak
The OCML-SLM-RCF methods of ratio, the method is realized by hardware device, is included the following steps:
S1, transmitting terminal generate ofdm signal;
S2, scrambler sequence array size needed for SLM algorithms is calculated;
S3, the ofdm signal for generating transmitting terminal, which are inserted into modulate in SLM algorithms, to be mapped;
S4, OCML scrambler sequences are generated;
S5, it required OCML scrambler sequences is inserted into the SLM algorithms according to the scrambler sequence array size obtains
Using OCML as the ofdm signal by SLM algorithm process of scrambler sequence, it is denoted as OCML-SLM signals;
S6, OCML- is obtained after being iterated limit filtration processing to the OCML-SLM signals one optimal sequence of selection
SLM-RCF signals;
S7, to the OCML-SLM-RCF signals choose an iteration after optimal sequence carry out send pretreatment sent
Pretreated OCML-SLM-RCF sequences are simultaneously sent.
Further, described in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention
OCML scrambler sequences are specially:
xn+1(i)=(1- ε) f (xn(i))+εf(xn(i-1))
Wherein, n is the discrete time, and the evolution algebraically of representative model, i is lattice site spatially, and i ∈ 1,2,
3 ..., L, L are OCML sequence scales, and ε indicates the coefficient of coup, xn(i) indicate i-th of lattice point moment n state value, f (x)=
1-ax2It is One Dimensional Chaotic Maps, a is nonlinear strength.
Further, described in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention
The OCML scrambler sequences of generation specifically refer to generate OCML using the method that Invariant Distribution characteristic generates space-time chaos binary sequence
Sequence.
Further, it in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention, also wraps
Include step:
S8, its peak value and average value are sought to pretreated OCML-SLM-RCF sequences in receiving terminal;
S9, in receiving terminal non-linear distortion peak-to-average force ratio is acquired using sequence peaks and average value.
Further, in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention, in step
In rapid S5, SLM algorithm process is carried out to the OCML-SLM signals, generates a plurality of OCML-SLM sequences;Calculate SLM system
PAPR complementation scores accumulated function expressions are:
[P (PAPR > PAPR0)]M={ 1- (1-exp (- PAPR0))N}M
Wherein, PAPR0For peak-to-average force ratio threshold value, M is dot product number, and N is the independent identically distributed of transmission identical information
OFDM symbol length.
Further, described in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention
It refers to adding protection interval after carrying out serioparallel exchange, inverse Fourier transform to OCML-SLM-RCF sequences to send pretreatment.
Further, in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention, step
The modulation system in modulation mapping in S3 is modulated for QPSK.
Further, in the OCML-SLM-RCF methods of the reduction OFDM non-linear distortion peak-to-average force ratios of the present invention, step
The iterations of the iteration in S6 are 4.
According to another aspect of the present invention, the present invention is to solve its technical problem, additionally provides a kind of storage device, is wrapped
It includes:The storage device store instruction and data for realizing above-mentioned any one reduction OFDM non-linear distortion peak-to-average force ratios
OCML-SLM-RCF methods.
In accordance with a further aspect of the present invention, the present invention is to solve its technical problem, and it is non-thread to additionally provide a kind of reduction OFDM
Property distortion peak-to-average force ratio OCML-SLM-RCF algorithm equipment, including:Processor and the storage device;The processor load is simultaneously
Instruction and data in above-mentioned storage device are executed to realize the reduction OFDM non-linear distortion peak-to-average force ratios of above-mentioned any one
OCML-SLM-RCF methods.
Implement OCML-SLM-RCF methods, equipment and the storage of a kind of reduction OFDM non-linear distortion peak-to-average force ratios of the present invention
Equipment has the advantages that:By the present invention in that using OCML sequences as the scrambler sequence in SLM algorithms, then combine repeatedly
For limit filtration, PAPR can be effectively reduced, and can generate and do the better effect of scrambler sequence than M sequence, PN sequences;
Meanwhile system performance is analyzed using OCML-SLM-RCF algorithms, from the point of view of bit error rate, technical scheme of the present invention takes
Obtained preferable effect;Effectively the non-linear distortion of ofdm system effectively can be inhibited using this method, to improve
The performance of ofdm system.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 be in the embodiment of the present invention it is a kind of reduce OFDM non-linear distortion peak-to-average force ratios OCML-SLM-RCF methods it is whole
Body flow chart;
Fig. 2 is OCML-SLM-RCF unified algorithms flow chart in the embodiment of the present invention;
Fig. 3 is the dependency diagram of OCML sequences in the embodiment of the present invention;
Fig. 4 is to be inserted into different scrambling codes effect diagram in the embodiment of the present invention in SLM algorithms;
Fig. 5 is contrast effect after the mapping of chosen property and iteration limit filtration under different scrambling codes sequence in the embodiment of the present invention
Schematic diagram;
Fig. 6 is to combine the system bit error rate of SLM-RCF algorithms with letter based on OCML scrambler sequences in the embodiment of the present invention
It makes an uproar than variation relation schematic diagram;
Fig. 7 is the hardware device operating diagram of the embodiment of the present invention.
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.
Referring to Fig. 1, Fig. 1 is a kind of OCML-SLM- reducing OFDM non-linear distortion peak-to-average force ratios in the embodiment of the present invention
The overall flow figure of RCF methods, the method are realized by hardware device.It is following in order to be better illustrated to the present embodiment
Embodiment when being executed, is simulated true environment, to provide specific effect diagram.
In the present embodiment, specific steps of the present invention include:
S101:Transmitting terminal generates ofdm signal, and is initialized (analog channel decaying) to fading signal.
S102:Calculate the size of the scrambler sequence of required insertion in SLM algorithms.
S103:The ofdm signal insertion SLM algorithms that transmitting terminal generates are modulated mapping and obtain modulated OFDM letters
Number, the modulation mapping mode is modulated for QPSK.
S104:OCML scrambler sequences are generated, the OCML scrambler sequences expression is:
xn+1(i)=(1- ε) f (xn(i))+εf(xn(i-1))
Wherein, n is the discrete time, and the evolution algebraically of representative model, i is lattice site spatially, and i ∈ 1,2,
3 ..., L, L are OCML sequence scales, and ε indicates the coefficient of coup, xn(i) indicate i-th of lattice point moment n state value, f (x)=
1-ax2It is One Dimensional Chaotic Maps, a is nonlinear strength.The method that space-time chaos binary sequence is generated using Invariant Distribution characteristic
OCML sequences are generated, specifically:Take a=1.9, ε=0.3, L=128*6.
S105:According to scrambler sequence size needed for SLM will OCML scrambler sequences be inserted into SLM algorithms in, obtain be with OCML
The ofdm signal through ovennodulation of scrambler sequence, is denoted as OCML-SLM.
S106:After above-mentioned SLM algorithms, generate n items (n here is equal to the number+1 (original series) of scrambler sequence)
OCML-SLM sequences, specifically:Take n=7;By calculating n sequence respectively peak-to-average force ratio, a minimum sequence of peak-to-average force ratio is found
Row, are denoted as OCML-SLM sequences.Optimal OCML-SLM sequences are handled by iteration limit filtration, are obtained after n times iteration
N OCML-SLM-RCF sequence of generation.
S107:A minimum sequence of peak-to-average force ratio is obtained in above-mentioned n OCML-SLM-RCF sequences, in the emulation, repeatedly
PAPR reduces degree and has been gradually reduced when generation number takes 4, therefore the OCML-SLM-RCF sequences after taking iteration four times.To described
OCML-SLM-RCF sequences are pre-processed, and are obtained pretreated OCML-SLM-RCF sequences and are specifically included:To OCML-SLM-
After progress decay calculation obtains decay calculation after addition protection interval after RCF sequences progress serioparallel exchange, inverse Fourier transform
OCML-SLM-RCF sequences;OCML-SLM-RCF sequences after the decay calculation add white Gaussian noise when passing through multipath channel
(analog channel noise).
S108:Signal averaging and peak value are acquired according to pretreated OCML-SLM-RCF sequences.
S109:The peak-to-average force ratio of OCML-SLM-RCF sequences is acquired using sequence peaks and average value.Expression is:
Wherein x (t) is that ofdm signal is specificT is symbol week
Phase, N are orthogonal subcarrier, fn=n Δ f,Its total wrong code element number is sought according to OCML-SLM-RCF sequences,
And total he number of system transmission, it is specific to calculate according to wrong code element number and total code element number computing system bit error rate
Expression formula is:
Wherein noe is wrong code element number always, and nod is total code element number.
It is OCML-SLM-RCF unified algorithms flow chart in the embodiment of the present invention referring to Fig. 2, Fig. 2:Algorithm specific implementation step
It is rapid as follows:
S201:The ofdm signal of generation.
S202:Above-mentioned ofdm signal is mapped to information code element X through QPSK modulationn, wherein n=para*nd;
S203:By information code element XnIt is respectively the OCML scrambler sequences of n with Nr length
P (u)=p1(u), p2(u) ..., pn(u), (u=1,2,3 ..., Nr), multiplication obtains
X (u)=s [X1(u), X2(u) ..., Xn(u)]T
S204:Above-mentioned X (u) is converted by IFFT to obtain x (u)=IFFT { X (u) }
S205:The peak-to-average force ratio for calculating x (u) sequences after transformation, finds a minimum sequence of peak-to-average force ratio and is iterated limit
Width filters.
S206:Cyclic prefix is inserted into above-mentioned optimal sequence.
S207:The data that amplitude is more than threshold value are carried out amplitude limit, specifically, taking by the amplitude for calculating above-mentioned sequence data
CR=4.
S208:Data after amplitude limit are subjected to FFT operations.
S209:By the sequential filtering processing after above-mentioned FFT transform.
S210:S207-S209 operations are repeated, until iterative process terminates.
S211:Signal after iteration limit filtration is sent to ofdm system and carries out pretreatment operation.
It is the dependency diagram of OCML scrambler sequences in the embodiment of the present invention referring to Fig. 3, Fig. 3, including:Autocorrelation value
Axis 301, cross correlation value axis 302, discrete time axis 303, autocorrelation curve 304 and cross correlation curve 305.By can in figure
See, the autocorrelation of OCML sequences is relatively strong but cross correlation is weaker.Wherein, autocorrelation is most strong in initial time.
Referring to Fig. 4, Fig. 4 be in the embodiment of the present invention in SLM algorithms be inserted into different scrambling codes effect diagram, including:It is inserted into
OCML scrambler sequences curve 401 is inserted into PN sequence curves 402, is inserted into M scrambler sequences curve 403.As can be seen from Figure, exist
10 in figure-3Place, the peak-to-average force ratio that observation can must be inserted into PN sequences are 10.2db, and the peak-to-average force ratio for being inserted into M scrambler sequences is 7.2db, is inserted
The peak-to-average force ratio for entering OCML scrambler sequences is 6.2db, is inserted into the peak-to-average force ratio ratio PN sequences of OCML scrambler sequences and reduces 4db, than inserting
Entering M scrambler sequences reduces 1db.It can be seen that the peak by SLM algorithm process can effectively be reduced by being inserted into OCML scrambler sequences
Compare, and shows performance more preferably than M scrambler sequence.
It is in the embodiment of the present invention under different scrambling codes sequence after the mapping of chosen property and iteration limit filtration referring to Fig. 5, Fig. 5
Contrast effect schematic diagram, including:Without iteration limit filtration sequence curve 501, OCML-SLM sequences are filtered through an iteration amplitude limit
Wave profile 502, OCML-SLM sequences are filtered through iteration limit filtration curve 503 twice, OCML-SLM sequences through iteration amplitude limit three times
Wave profile 504, OCML-SLM sequences are through four iteration limit filtration curves 505.As can be seen from Figure, 10 in figure-4Place, not
Peak-to-average force ratio through iteration limit filtration sequence curve is 11db, the OCML-SLM sequence curves after an iteration limit filtration
Peak-to-average force ratio is 9db, than reducing 2db without iteration limit filtration sequence;The peak of OCML-SLM sequence curves after iteration twice
Than for 7.9db, than reducing 3.1db without iteration limit filtration sequence;The OCML-SLM sequence curves after iteration three times
Peak-to-average force ratio is 7.4db, than reducing 3.6db without iteration limit filtration sequence;The OCML-SLM sequence curves after four iteration
Peak-to-average force ratio be 7db, than without iteration limit filtration sequence reduce 4db.As can be seen that with the increase curve of iterations
Peak-to-average force ratio is sequentially reduced, but when iterating to the 4th time, the effect of reduction unobvious, therefore takes the iterations to be in this emulation
Four times.
It is the system mistake ratio for combining SLM-RCF algorithms in the embodiment of the present invention based on OCML scrambler sequences referring to Fig. 6, Fig. 6
Special rate with signal-to-noise ratio variation relation schematic diagram, including:Original ofdm system bit error rate curve 601 and join through OCML-SLM-RCF
Hop algorithm treated ofdm system bit error rate curve 602.As can be seen from Figure, take signal-to-noise ratio be 40 when, by joint
The system bit error rate of algorithm can drop to 10-5Hereinafter, being less than raw bit error rate, thus it can be seen that and be based on OCML-SLM-
The unified algorithm of RCF is more effective in terms of improving system performance.
It is the hardware device operating diagram of the embodiment of the present invention referring to Fig. 7, Fig. 7, the hardware device specifically includes:One
Kind reduces OCML-SLM-RCF algorithms equipment 701, processor 702 and the storage device 703 of OFDM non-linear distortion peak-to-average force ratios.
A kind of OCML-SLM-RCF algorithms equipment 701 reducing OFDM non-linear distortion peak-to-average force ratios:A kind of reduction
The OCML-SLM-RCF algorithms equipment 701 of OFDM non-linear distortion peak-to-average force ratios realizes the reduction OFDM non-linear distortion peak-to-average force ratios
OCML-SLM-RCF algorithms.
Processor 702:The processor 702 loads and executes the instruction in the storage device 703 and data for real
A kind of OCML-SLM-RCF algorithms of existing reduction OFDM non-linear distortion peak-to-average force ratios.
Storage device 703:703 store instruction of the storage device and data;The storage device 703 is for realizing described
A kind of reduction OFDM non-linear distortion peak-to-average force ratios OCML-SLM-RCF algorithms.
By executing the embodiment of the present invention, all technical characteristics in the claims in the present invention are obtained for detailed explain
It states.
It is different from existing technology, example of the invention provides a kind of OFDM non-linear distortion peak-to-average force ratios that reduce
OCML-SLM-RCF algorithms, equipment and storage device by using OCML sequences as the scrambler sequence in SLM algorithms, and are tied
Iteration limit filtration algorithm is closed, the peak-to-average force ratio in non-linear distortion is effectively reduced while reducing noise jamming, is produced
Effect more better than random scrambler sequence is given birth to.Meanwhile using the SLM-RCF unified algorithms based on OCML to ofdm system performance
It is analyzed, from the point of view of bit error rate, technical scheme of the present invention achieves preferable effect.So can be with using this method
Effectively the non-linear distortion of ofdm system is effectively inhibited, to improve the performance of ofdm 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 (10)
1. a kind of OCML-SLM-RCF methods reducing OFDM non-linear distortion peak-to-average force ratios, the method are realized by hardware device,
It is characterized by comprising the following steps:
S1, transmitting terminal generate ofdm signal;
S2, scrambler sequence array size needed for SLM algorithms is calculated;
S3, the ofdm signal for generating transmitting terminal, which are inserted into modulate in SLM algorithms, to be mapped;
S4, OCML scrambler sequences are generated;
S5, required OCML scrambler sequences are inserted into the SLM algorithms according to the scrambler sequence array size obtain with
OCML is the ofdm signal by SLM algorithm process of scrambler sequence, is denoted as OCML-SLM signals;
S6, OCML-SLM- is obtained after being iterated limit filtration processing to the OCML-SLM signals one optimal sequence of selection
RCF signals;
S7, to the OCML-SLM-RCF signals choose an iteration after optimal sequence carry out send pretreatment obtain sending pre- place
OCML-SLM-RCF sequences after reason are simultaneously sent.
2. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In the OCML scrambler sequences are specially:
xn+1(i)=(1- ε) f (xn(i))+εf(xn(i-1))
Wherein, n is the discrete time, and the evolution algebraically of representative model, i is lattice site spatially, and i ∈ 1,2,3 ...,
L, L are OCML sequence scales, and ε indicates the coefficient of coup, xn(i) indicate i-th of lattice point in the state value of moment n, f (x)=1-ax2
It is One Dimensional Chaotic Maps, a is nonlinear strength.
3. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In the OCML scrambler sequences of the generation specifically refer to generate the method life of space-time chaos binary sequence using Invariant Distribution characteristic
At OCML sequences.
4. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In further including step:
S8, its peak value and average value are sought to pretreated OCML-SLM-RCF sequences in receiving terminal;
S9, in receiving terminal non-linear distortion peak-to-average force ratio is acquired using sequence peaks and average value.
5. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In in step s 5, carrying out SLM algorithm process to the OCML-SLM signals, generate a plurality of OCML-SLM sequences;It calculates
The PAPR complementation scores accumulated function expressions of SLM system are:
[P (PAPR > PAPR0)]M={ 1- (1-exP (- PAPR0))N}M
Wherein, PAPR0For peak-to-average force ratio threshold value, M is dot product number, and N is the independent identically distributed OFDM symbol for transmitting identical information
Length.
6. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In the transmission pretreatment refers to adding protection after carrying out serioparallel exchange, inverse Fourier transform to OCML-SLM-RCF sequences
Every.
7. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In the modulation system in modulation mapping in step S3 is modulated for QPSK.
8. the OCML-SLM-RCF methods according to claim 1 for reducing OFDM non-linear distortion peak-to-average force ratios, feature exist
In the iterations of the iteration in step S6 are 4.
9. a kind of storage device, which is characterized in that including:The storage device store instruction and data are for realizing claim
1~8 any one of them reduces the OCML-SLM-RCF methods of OFDM non-linear distortion peak-to-average force ratios.
10. a kind of OCML-SLM-RCF equipment reducing OFDM non-linear distortion peak-to-average force ratios, which is characterized in that including:Processor
And the storage device;Instruction and data in storage device described in the processor load and perform claim requirement 9 is with reality
Existing claim 1~8 any one of them reduces the OCML-SLM-RCF methods of OFDM non-linear distortion peak-to-average force ratios.
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| CN110492938B (en) * | 2019-08-28 | 2022-07-22 | 兰州理工大学 | Method for inhibiting influence of LED nonlinear distortion on visible light communication performance |
| CN110611632A (en) * | 2019-10-11 | 2019-12-24 | 珠海中慧微电子有限公司 | Method for reducing peak-to-average ratio of OFDM (orthogonal frequency division multiplexing) signals |
| CN112995089A (en) * | 2021-05-19 | 2021-06-18 | 南京信息工程大学 | Chaotic mapping-based low-complexity selective mapping method improvement method |
| CN112995089B (en) * | 2021-05-19 | 2021-07-27 | 南京信息工程大学 | Chaotic mapping-based low-complexity selective mapping method improvement method |
| CN114189418A (en) * | 2021-11-25 | 2022-03-15 | 南京信息工程大学 | High-safety optical access system for reducing PAPR based on selective mapping method |
| CN114189418B (en) * | 2021-11-25 | 2023-04-14 | 南京信息工程大学 | High-safety optical access system for reducing PAPR based on selective mapping method |
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