CN106789828A - A kind of method that FBMC OQAM system peak-to-average power ratios are reduced based on peak time tracking feedback - Google Patents
A kind of method that FBMC OQAM system peak-to-average power ratios are reduced based on peak time tracking feedback Download PDFInfo
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- CN106789828A CN106789828A CN201611219471.7A CN201611219471A CN106789828A CN 106789828 A CN106789828 A CN 106789828A CN 201611219471 A CN201611219471 A CN 201611219471A CN 106789828 A CN106789828 A CN 106789828A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
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Abstract
The invention discloses a kind of method for reducing FBMC OQAM system peak-to-average power ratios based on peak time tracking feedback, comprise the following steps：1) subcarrier for carrying FBMC symbols is grouped in advance, real part carries out inverse Fourier transform and multiphase filter modulation successively with imaginary component block signal, obtains time domain sending signal；2) the peak-peak position point of cycle detection time-domain signal, and data at the correspondence position point of piecemeal signal carry out phase place；3) data that one group of optimal phase factor combination is multiplied by select location point are found out so that itself and minimum, that is, reduces the peak value of this position；4) primary signal is replaced to produce new time-domain signal with the data for optimizing phase.The present invention can make the power amplifier of transmitting terminal be in linear condition by peak time tracking feedback algorithm reduction peak-to-average power ratio, and transmission signal distortion will not be caused to improve communication quality.Compared with conventional method, the present invention is with lower computation complexity and more preferable reduction peak-to-average power ratio effect.
Description
Technical field
It is more particularly to a kind of that FBMC-OQAM systems are reduced based on peak time tracking feedback the present invention relates to 5G communication technical fields
The method of system peak-to-average power ratio.
Background technology
5G is the third generation mobile communication system developed towards mobile communication demand after the year two thousand twenty, and it will be with Internet of Things
The field such as net, industry internet and car networking fusion development, brings magnanimity to access and very fast rate requirement, triggers network pipeline stream
The blast of amount increases.The availability of frequency spectrum and efficiency of its superelevation, an amount is improved at aspects such as transmission rate, time delays compared with 4G systems
Level is higher.From being wirelessly transferred in aspect, harsher requirement is proposed to multicarrier multicast technology under 5G scenes：
First, due to the extensive and not timing of machine-to-machine communication (M2M), should not use and require scheme high to synchronous；Second,
The fragment resource between frequency band is made full use of, larger scheme should not be revealed using side-lobes power.
There are some shortcomings in OFDM (OFDM) multi-carrier modulation technology being now widely used in 4G communications
It is set to be difficult to meet the demand in 5G scenes.First, must be synchronous to keep orthogonality between each subcarrier in OFDM, in cell
Synchronous cost will be difficult to bear when inside there is magnanimity sensing node；Second, it uses square wave as baseband waveform, carrier wave secondary lobe
It is larger；Finally, its need additional cycles prefix (CP) length eliminate intersymbol interference (Inter-Symbol Interference,
) and inter-carrier interference (Inter-Channel Interference, ICI) causes a large amount of wastes of frequency resource ISI.Therefore have
Necessity is explored and development multi-transceiver technology of new generation.
Filter bank multi-carrier (Filter Bank Multicarrier modulation, FBMC) is a kind of frequency spectrum effect
The multi-carrier transmission scheme that rate is high, implementation complexity is fine, need not be synchronous.It does not use Cyclic Prefix, on each subcarrier
Filtering, wave filter meets Nyquist without intersymbol interference criterion to eliminate overlapping generation between ISI, adjacent sub-bands by particular design
ICI by Offset Quadrature Amplitude modulate (OQAM) eliminate.Therefore FBMC turns into the multi-transceiver technology alternative in 5G communications.
Because multi-carrier communications systems have multiple subcarriers, output signal is the superposition of multiple sub-channel signals, group
When channel signal phase is consistent, the instantaneous power of superposed signal will be significantly larger than mean power, cause the equal power in peak higher
Than (PAPR).PAPR high proposes requirement very high to the linearity of transmitter amplifier, and amplifier nonlinearity can cause signal
Distortion, makes signal spectrum change, and so as to cause the interference between each subchannel, makes system performance degradation.Equally, FBMC is one
Multi-carrier modulation technology is planted, its distinctive modulating characteristic determines that it has PAPR higher, reduces the property of FBMC-OQAM systems
Can even influence the extensive use of this technology, therefore urgently a kind of scheme reduces the PAPR high of FBMC-OQAM systems.
The content of the invention
Technical problem solved by the invention is the peak-to-average power ratio for reducing FBMC-OQAM systems, it is proposed that a kind of peak value
The signal of the peak value that tracking feedback method processing system is produced, reaches the purpose of the PAPR high of reduction system, so as to reduce hard
The complexity that part is implemented, improves the communication quality of system.
In order to solve the above-mentioned technical problem, technical scheme proposed by the invention is：
A kind of method for reducing FBMC-OQAM system peak-to-average power ratios based on peak time tracking feedback, comprises the following steps：
Step 1, is divided into V groups by N number of subcarrier of carrying signal in advance, and every group of number of subcarrier is N/V, then to dividing
Subcarrier after group carries out OQAM modulation, by the complex symbol after modulation successively through inverse Fourier transform (IFFT) and multiphase filtering
Device (PPN) modulates packet transmission, then each group summation obtains time domain FBMC signals S (t)；
Step 2, carries out peakvalue's checking to FBMC signals, and the position where recording peak-peak, and position is fed back to point
Block signal, then phase transition is carried out to the data at relevant position point on piecemeal signal, find out one group of optimal phase place because
Son makes the peak value on time-domain signal relevant position minimum, and updates this position signalling；
Step 3, is repeated several times execution step 2, and carries out phase transition to the data on the position with peak-peak, more
New primary signal, finally gives the sending signal for reducing PAPR.
Described method, in step 1, before inverse Fourier transform and filters modulate is carried out, first to the son after packet
Carrier wave carries out OQAM modulation, and OQAM is separately processed the real part of complex symbol and imaginary part when modulating, and time interval is
T/2, wherein T are a FBMC symbol period.
Described method, in step 1, after obtaining carrying out real part after OQAM modulation and imaginary component block signal, then by piecemeal
Real part and imaginary part modulated signal carry out inverse fast Fourier change successively and multiphase filter is modulated, obtain time domain FBMC signals
S(t)。
Described method, step 2 is concretely comprised the following steps, and the time domain FBMC signals to being obtained in step 1 carry out peakvalue's checking,
Location point P where determining peak-peak, and P is fed back to the piecemeal signal in step 1, obtain piecemeal signal correspondence position point
On data Dv(v=1,2 ..., V), wherein V is the number of packet of subcarrier, then using different phase rotation coefficient bv
∈ { -1,1 } is respectively to the data D on each piecemeal signalv(v=1,2 ..., V) carries out phase optimization, so that data DvPhase
Can not be consistent in synchronization, then all data DvPhase place mode have 2VCombination is planted, one group of phase is then therefrom selected
Position twiddle factor (b1,b2,..,bV), make (b1D1,b2D2,...,bVDV) each data and value it is minimum, and with (b1D1,
b2D2,...,bVDV) replace data on piecemeal signal this position.
Described method, in described step 3, presets iterations value I first, and repeats step 2, until performing
Untill number of times meets iterations value I.
The present invention reduces the peak-to-average power ratio of FBMC-OQAM systems using peak time tracking feedback algorithm, with traditional scheme phase
Than, computation complexity is simplified, PAPR reduction performances are improved, the power amplifier of transmitting terminal is in linear condition, will not
Cause transmission signal distortion, improve communication quality.
Brief description of the drawings
Fig. 1 is the FBMC-OQAM system block diagrams that radio communication is carried out using the present invention；
Fig. 2 is the structure principle chart that FBMC-OQAM system transmitters are used in using the present invention program；
Fig. 3 is the flow chart that algorithm of the invention is implemented；
Fig. 4 is the simulation result of PAPR reductions performance of the present invention；
Fig. 5 is the time domain beamformer after process signal of the present invention；
Fig. 6 is the present invention and other schemes reduction PAPR performance maps.
Specific embodiment
Below in conjunction with the accompanying drawings with specific example, specific embodiment of the invention is described in further detail.
The present invention provides a kind of peak time tracking feedback and reduces FBMC-OQAM system peak-to-average power ratio methods, and idiographic flow is such as
Fig. 3, comprises the following steps：
S1, subcarrier is divided into V groups in advance, carries out OQAM modulation to FBMC symbols, the real part of complex symbol with it is empty
The separately treatment of number part, its imaginary part with respect to real part time delay T/2 (T be a FBMC symbol period), then by real part and imaginary part piecemeal
Signal carries out inverse fast fourier transform (IFFT) and multiphase filter (PPN) modulation successively, obtains time domain sending signal；
S2, setting iterations value I, because the appearance of the larger peak value of FBMC time-domain signals is random, it is necessary to detect many
Individual larger peak value reduces the peak power of FBMC signals, it is to avoid the appearance of PAPR high.
The peak-peak position point P of S3, detection time-domain signali(i=1,2 ..., I), and in piecemeal signal
Subblock finds correspondence position PiOn dataPhase optimization is carried out, so that data DvPhase not
Can be consistent in synchronization, phase rotation coefficient bv∈{-1,1}。
S4, find out one group of optimal (b1,b2,..,bV), and the data that this combination is multiplied by piecemeal signal location point P are obtained
To (b1D1,b2D2,...,bVDV), then each data summing value is minimum, and with (b1D1,b2D2,...,bVDV) replace piecemeal signal position
Put the data of P.
S5, repeat step S3, S4, until meeting iterations I, and update the data on I each position point, final summation
It has been reduced the FBMC time-domain signals of peak-to-average power ratio.
The present invention reduces the Performance Simulation Results of FBMC-OQAM system peak-to-average power ratios as shown in Figure 4, Figure 5.Due to signal
The appearance of peak value is random, and the performance of the PAPR of signal is often distributed with the cumulative distribution function (CDF) and complimentary cumulative of PAPR
Function (CCDF) is embodied, and normal CCD F is more often used than CDF.The complimentary cumulative function representation of PAPR be a data block when
The power of domain signal exceedes the probability of a certain given thresholding, and the PAPR0 in figure is the threshold value of setting.Fig. 4 draw be
The present invention reduces the performance of PAPR in the case where subcarrier is divided into 4 groups of different iterationses (I=6,8,12,16).With repeatedly
The increase system PAPR reductions performance of generation number is better.The number of times of iteration means the position points of process signal, relatively entirely
The length of FBMC symbols, the iterations that the present invention is selected is the value of very little, illustrates that the computation complexity very little of this scheme is held very much
Easily realize preferably reducing PAPR performances.Fig. 5 is depicted using the FBMC time-domain signals after iteration of the present invention 16 times,
' PTFsignal ' is represented.' Original signal ' are untreated FBMC time-domain signals.It is right that Fig. 5 substantially embodies the present invention
16 peak values of signal have carried out range of decrease treatment, and other positions signal keeps constant, therefore the coincidence of two lines occurs in other positions.
Having by the comparative analysis present invention substantially reduces the effect of PAPR.Fig. 6 depicts other two schemes piecemeal partial transmission sequence
(S-PTS) and sliding window tone reservation (SW-TR) with the present invention reduce peak-to-average power ratio Performance comparision figure.Can be seen by figure
Go out, iterations of the present invention is 8, when having the situation of same edge information with S-PTS schemes, performance of the invention is better than S-PTS；When
When this programme iterations is 16, the calculating that PAPR reductions performance is also significantly better than in the case of the latter, and this kind of parameter is complicated
Degree is also well below S-PTS schemes.SW-TR schemes also have preferable PAPR reductions performance as seen from the figure, but it uses cunning
Dynamic window is introduced into secondary lobe and can cause the distortion of FBMC signals, and it needs preserved sub-carrier to cause the waste of frequency resource, and
This programme will not cause distorted signals also not interfere with the bit error rate performance of system using the method for phase optimization, and it is reduced
The effect of PAPR becomes apparent from.In summary it can be seen that the present invention can effectively reduce the PAPR of FBMC-OQAM systems.
Claims (5)
1. it is a kind of based on peak time tracking feedback reduce FBMC-OQAM system peak-to-average power ratios method, it is characterised in that including with
Lower step：
Step 1, is divided into V groups by N number of subcarrier of carrying signal in advance, and every group of number of subcarrier is N/V, then to packet after
Subcarrier carry out OQAM modulation, by the complex symbol after modulation successively through inverse Fourier transform (IFFT) and multiphase filter
(PPN) packet transmission is modulated, then each group summation obtains time domain FBMC signals S (t)；
Step 2, carries out peakvalue's checking to FBMC signals, and the position where recording peak-peak, and position is fed back into piecemeal letter
Number, then phase transition is carried out to the data at relevant position point on piecemeal signal, finding out one group of optimal phase rotation coefficient makes
Peak value on time-domain signal relevant position is minimum, and updates this position signalling；
Step 3, is repeated several times execution step 2, and the data on the position with peak-peak are carried out with phase transition, updates former
Beginning signal, finally gives the sending signal for reducing PAPR.
2. method according to claim 1, it is characterised in that in step 1, is carrying out inverse Fourier transform and wave filter is adjusted
Before system, OQAM modulation is carried out to the subcarrier after packet first, by the real part of complex symbol and imaginary part when OQAM is modulated
Separately treatment, time interval is T/2, and wherein T is a FBMC symbol period.
3. method according to claim 2, it is characterised in that in step 1, obtain carrying out real part after OQAM modulation with it is empty
After the block signal of part, then the real part of piecemeal and imaginary part modulated signal are carried out into inverse fast Fourier change and multiphase filter successively
Modulation, obtains time domain FBMC signals S (t).
4. method according to claim 1, it is characterised in that step 2 is concretely comprised the following steps, to obtained in step 1 when
Domain FBMC signals carry out peakvalue's checking, the location point P where determining peak-peak, and P is fed back to the letter of the piecemeal in step 1
Number, obtain the data D on piecemeal signal correspondence position pointv(v=1,2 ..., V), wherein V is the number of packet of subcarrier, so
Different phase rotation coefficient b is utilized afterwardsv∈ { -1,1 } is respectively to the data D on each piecemeal signalv(v=1,2 ..., V) carry out
Phase optimization, so that data DvPhase can not be consistent in synchronization, then all data DvPhase place mode have 2V
Combination is planted, one group of phase rotation coefficient (b is then therefrom selected1,b2,..,bV), make (b1D1,b2D2,...,bVDV) each data
It is minimum with value, and with (b1D1,b2D2,...,bVDV) replace data on piecemeal signal this position.
5. method according to claim 1, it is characterised in that in described step 3, presets iterations value I first, and
Step 2 is repeated, untill execution number of times meets iterations value I.
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| CN108650204A (en) * | 2018-03-16 | 2018-10-12 | 西安电子科技大学 | For the FBMC/OQAM modulating control systems and method of FPGA, modulator |
| CN108848047A (en) * | 2018-07-02 | 2018-11-20 | 重庆邮电大学 | A kind of filter bank multi-carrier transmitter implementation method |
| CN109818890A (en) * | 2019-03-12 | 2019-05-28 | 北京科技大学 | A kind of ptototype filter determines method and determining device |
| CN111294307A (en) * | 2019-07-15 | 2020-06-16 | 锐迪科创微电子（北京）有限公司 | Signal transmission method and device, storage medium and user terminal |
| CN111865858A (en) * | 2019-04-30 | 2020-10-30 | 华为技术有限公司 | Side information transmission method and device based on partial transmission sequence technology |
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| CN113225289A (en) * | 2021-04-09 | 2021-08-06 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Method for reducing peak-to-average power ratio of filter bank multi-carrier system |
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| CN108650204A (en) * | 2018-03-16 | 2018-10-12 | 西安电子科技大学 | For the FBMC/OQAM modulating control systems and method of FPGA, modulator |
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| CN108848047A (en) * | 2018-07-02 | 2018-11-20 | 重庆邮电大学 | A kind of filter bank multi-carrier transmitter implementation method |
| CN109818890B (en) * | 2019-03-12 | 2020-04-10 | 北京科技大学 | Prototype filter determining method and device |
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| CN111865858B (en) * | 2019-04-30 | 2022-01-11 | 华为技术有限公司 | Side information transmission method and device based on partial transmission sequence technology |
| US11695609B2 (en) | 2019-04-30 | 2023-07-04 | Huawei Technologies Co., Ltd. | Side information transmission method based on partial transmit sequence technology, and apparatus |
| CN111294307A (en) * | 2019-07-15 | 2020-06-16 | 锐迪科创微电子（北京）有限公司 | Signal transmission method and device, storage medium and user terminal |
| US11929861B2 (en) | 2019-07-15 | 2024-03-12 | Rda Microelectronics (Beijing) Co., Ltd. | Signal transmitting method and apparatus, storage medium, and user terminal |
| CN113225289A (en) * | 2021-04-09 | 2021-08-06 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Method for reducing peak-to-average power ratio of filter bank multi-carrier system |
| CN113179238A (en) * | 2021-04-27 | 2021-07-27 | 中山大学 | Method for reducing peak-to-average power ratio of FBMC-OQAM system |
| CN113179238B (en) * | 2021-04-27 | 2022-05-06 | 中山大学 | Method for reducing peak-to-average power ratio of FBMC-OQAM system |
| CN114978837A (en) * | 2022-05-11 | 2022-08-30 | 苏州大学 | Filter bank multi-carrier system signal transmission method, device and storage medium |
| CN114978837B (en) * | 2022-05-11 | 2023-07-25 | 苏州大学 | Method, device and storage medium for transmitting signals of filter bank multi-carrier system |
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