CN110071890A - A kind of low peak average ratio FBMC-OQAM signal processing method and system - Google Patents
A kind of low peak average ratio FBMC-OQAM signal processing method and 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
- 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
- H04L27/2615—Reduction thereof using coding
- H04L27/2617—Reduction thereof using coding using block codes
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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
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
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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
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Abstract
A kind of low peak average ratio FBMC-OQAM signal processing method and system, are the method for processing baseband signal and system that FBMC-OQAM signal peak-to-average ratio is reduced based on DFT precoding.By the way that the pre-transmission data after grouping are mapped as meeting the data sequence of specific conjugate symmetry property, using DFT to carry out precoding again can be by the Sequence Transformed real empty alternately arranged data sequence to meet the real orthogonal requirements of OQAM modulation of conjugate symmetric data that mapping obtains, therefore the data sequence after the precoding can map directly to and carry out IFFT subcarrier-modulated and filtering on corresponding subcarrier.By the system and signal processing method, avoids and carry out the additional OQAM pretreatment operation for separating the real imaginary part of plural number between DFT precoding and subcarrier-modulated IFFT.Therefore the transmitting signal of FBMC-OQAM system can be made to restore single-carrier property by DFT precoding by the system and signal processing method, and then can significantly reduces the peak-to-average force ratio of FBMC-OQAM transmitting signal.
Description
Technical field
The present invention relates to communication technique fields, and in particular to a kind of low peak average ratio FBMC-OQAM signal processing method and is
System.
Background technique
Multi-carrier modulation has been widely used in each communication system as a kind of communication waveforms technology, and basic thought is
Transmitted bit stream is divided into multiple sub- bit streams, is transmitted in re-modulation to different subcarriers.In numerous multicarrier tune
In technology processed, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is because of its frequency
Spectrum efficiency is high, transceiver complexity is low, balanced the advantages that being simply easy to multi-antenna technology combined use, has obtained answering extensively
With, such as digital television broadcasting (Digital Video Broadcast, DVB) and the WLAN (Wireless in Europe
Local Area Networks, WLAN) etc..With the isomerization and asynchronization of future communications network, OFDM band with higher
Outside (Out Of Band, OOB) radiation with to the concern for some disadvantages also gradually the cause people such as synchronous error is sensitive.For example, object
Networking magnanimity wireless access, coordinated multipoint transmission and equipment room direct communication etc. require to reduce modulation waveform to precise synchronization
Demand, to meet as ensured communication performance while low cost and low signaling overheads.In addition, cognitive radio, carrier wave polymerization etc.
Technology is also required to signal modulation waveform with lower band outward leakage, so that more efficient utilizes fragment frequency spectrum.
To cope with these challenges, filter bank multi-carrier (FBMC, Filter Bank Multi-Carrier) is due to its tool
Have the advantages that extremely low OOB radiation is considered as the waveform technology of great prospect.In FBMC system, due to excellent time-frequency
Focus the introducing of the ptototype filter (Prototype Filter, PF) of (Time-Frequency Localization, TFL)
Greatly reduce OOB radiation, so as to effectively control inter-carrier interference (Inter-Carrier Interference,
), ICI to flexibly efficiently use frequency spectrum resource and reduce synchronous demand.It is simultaneously to improve the availability of frequency spectrum and cope with prototype
Nonorthogonality caused by the introducing of filter, FBMC system generally use Offset Quadrature Amplitude modulation (Offset
Quadrature Amplitude Modulation, OQAM) replace traditional quadrature amplitude modulation (Quadrature
Amplitude Modulation,QAM).In OQAM modulation, complex data symbols transmitted by original QAM modulation can be close
It is seemingly equivalent to send two real number symbols at the same time, to keep spectrum efficiency constant.I.e. in FBMC-OQAM system
In, multiple orthogonal property in traditional OFDM needs relax for real number field it is orthogonal, thus provide spectrum efficiency, OOB radiation with
The solution of orthogonality three compromise.Since FBMC modulates extremely low OOB radiation, so that FBMC has in asynchronous communication networks
There is very big advantage.Such as in magnanimity internet of things, due to numerous terminal quantities, the synchronous of equipment room needs to expend largely
Signal resource, protection subcarrier well, which can be used, using FBMC system greatly reduces interference between async user, thus
The power consumption of signal resource and terminal device can largely be saved.
The same with OFDM as a kind of multicarrier waveform technology, FBMC also faces more serious peak-to-average force ratio (Peak-to-
Average Power Ratio, PAPR) problem, FBMC-OQAM symbol is by the subcarrier-modulated of multiple independent equibands
Made of signal is added, they, which are added, when the signal phase on subcarrier is identical can generate biggish peak work
Rate (peak power), the ratio of the peak power and mean power that thus will lead to signal is larger, this ratio abbreviation peak is equal
Than (PAPR).To avoid the nonlinear influence of power amplifier, amplifying circuit needs the back-off value increased, this will seriously increase terminal
The power consumption of equipment, reduce battery service life, this to nonlinear satellite communication system and low cost Internet of Things Network Communication influence
It is particularly acute.In order to reduce the PAPR of FBMC system, the technology for being conventionally used to reduction ofdm system PAPR, which is equally studied, is answered
For FBMC system, such as Choose for user method or part transmitting sequence method.But these methods are made due to the computation complexity of height
It is obtained to be difficult to be applied in FBMC-OQAM system.
Summary of the invention
The present invention solves the technical problem of design a kind of FBMC-OQAM system for significantly reducing PAPR.
According in a first aspect, providing a kind of data processing method for FBMC-OQAM in a kind of embodiment, comprising:
The initial data of pre-transmission is grouped, and serioparallel exchange is carried out to every group of initial data；
It is each mapped to every group of initial data after serioparallel exchange to meet the data sequence of specific conjugate symmetry property；
The data sequence mapped every group carries out DFT precoding respectively, is meeting FBMC-OQAM system in fact just to obtain
Hand over desired real empty alternately arranged pre-transmission data.
Further, the length of every group of initial data is M/2, and wherein M is the subcarrier number of FBMC-OQAM system, conjugation
Data sequence length after symmetrical mapping is M, M=2L, the value range of L is the natural number more than or equal to 2.
Further, the data sequence for meeting specific conjugate symmetry property, for the data sequence for meeting following formula:
Wherein, b (k) is k-th of data in data sequence, and sequence length M, λ=± j or ± 1 is invariant,To take imaginary part to operate.
According to second aspect, the data processing method of low peak average ratio FBMC-OQAM a kind of is provided in a kind of embodiment, is wrapped
It includes:
The receiving end of FBMC-OQAM system by received baseband signal through multiphase filtering, FFT subcarrier demodulation, equilibrium and
OQAM demodulation operation, to obtain the real data of demodulation；
Phase factor is added to each real data in the FBMC-OQAM system same symbol period, and carries out IFFT and turns
It changes, to obtain the receiving end conjugate symmetric data sequence for meeting specific conjugate symmetry property；
The receiving end conjugate symmetric data sequence is subjected to demapping operation, to obtain the estimated value of initial data；
It will be exported after the estimated value parallel-serial conversion of the initial data.
Further, real data m subcarriers in the nth symbol of FBMC-OQAM system demodulated is multiplied by phase
Factor jm, so that receiving real data in each symbol period of FBMC-OQAM system is converted into one group of real empty alternately row
The data sequence of column；Wherein, the value range of n is natural number, and the value range of m is 0,1,2 ..., M；M is FBMC-OQAM system
The active sub-carriers number of system.
Further, the real data after addition phase factor in each symbol period is subjected to IFFT conversion, it is full to obtain
The receiving end conjugate symmetric data sequence of the specific conjugate symmetry property of foot.
Further, for the receiving end conjugate symmetric data sequence vector in any nth symbol periodIt indicates,
Data sequence in the symbol periodThe estimated value vector for the n-th group initial data that demapping operation obtainsIt indicates；
Data sequence in the nth symbol periodDemapping is the estimation of n-th group initial data as follows
Value
Wherein, the value range of n is nonnegative integer；It is expressed as the estimated value of n-th group initial dataIn
K number evidence；The data sequence being expressed as in the nth symbol periodIn k-th of data；Indicate the representative of subscript *
Conjugate.To take real part to operate；To take imaginary part to operate.
According to the third aspect, a kind of low peak average ratio FBMC-OQAM system is provided in a kind of embodiment, comprising:
Preprocessing module is pre-processed for the initial data to pre-transmission, meets FBMC- to obtain
The real empty alternately arranged pre-transmission data of OQAM system reality orthogonal requirements；
Sending module, for the pretreated pre-transmission data to be carried out the FBMC such as subcarrier-modulated, multiphase filtering
Systems baseband signal processing operations, and complete Carrier Modulation, filtering, amplification etc. and be sent in channel；
The preprocessing module includes:
Preceding serioparallel exchange module is grouped for the initial data to pre-transmission, and is gone here and there to every group of initial data
And it converts；
It is conjugated symmetrical mapping block, for being each mapped to every group of initial data after serioparallel exchange to meet specific conjugation
The data sequence of symmetry characteristic；
Preceding FFT module carries out DFT precoding for the data sequence to every group of mapping respectively, meets FBMC- to obtain
The real empty alternately arranged pre-transmission data of OQAM system reality orthogonal requirements.
According to fourth aspect, a kind of low peak average ratio FBMC-OQAM system is provided in a kind of embodiment, comprising:
Receiving module, for will from the received baseband signal of channel through multiphase filtering, FFT subcarrier demodulation, equilibrium and
OQAM demodulation operation, to obtain real data；
Post-processing module, the real data addition phase factor for being obtained to the receiving module, IFFT conversion, Xie Ying
It penetrates and the last demodulation output data after serioparallel exchange operation, as the FBMC-OQAM system；
The post-processing module includes:
Phase factor module is added, for each real solution adjusting data in the FBMC-OQAM system same symbol period
Add phase factor；
IFFT module afterwards is carried out IFFT conversion for the real data to addition phase factor, is met with acquisition specific total
The receiving end data sequence of yoke symmetry characteristic；
De-mapping module, for the receiving end data sequence to be carried out demapping operation, to obtain estimating for initial data
Evaluation；
Serioparallel exchange module afterwards, for being used as the FBMC-OQAM after the estimated value parallel-serial conversion by the initial data
The last demodulation output data of system.
According to a kind of data processing method and FBMC-OQAM system for FBMC-OQAM of above-described embodiment, due to inciting somebody to action
Pre-transmission data after grouping are mapped as meeting the data sequence of specific conjugate symmetry property, then use DFT precoding by data
Sequence Transformed is real empty alternately arranged pre-transmission data, because the pre-transmission data can be by the transmitting terminal of FBMC-OQAM system
It directly transmits, so that the modulation of FBMC-OQAM system restores single-carrier property, and then FBMC-OQAM system can be significantly reduced
PAPR.
Detailed description of the invention
Fig. 1 is the ofdm system model structure schematic diagram based on DFT precoding；
Fig. 2 is a kind of baseband system model structure schematic diagram of FBMC-OQAM system in embodiment；
Fig. 3 is a kind of structural schematic diagram of the OQAM preprocessing module of FBMC-OQAM system in embodiment；
Fig. 4 is the structural schematic diagram of the OQAM preprocessing module of FBMC-OQAM system in another embodiment；
Fig. 5 is a kind of structural schematic diagram of the OQAM post-processing module of FBMC-OQAM system in embodiment；
Fig. 6 is a kind of structural schematic diagram of the FBMC-OQAM system of direct DFT precoding in embodiment；
Fig. 7 is a kind of flow chart of low peak average ratio FBMC-OQAM system transmitting terminal signal processing method in embodiment；
Fig. 8 is that every group of initial data length is 4 to be mapped as meeting the data of specific conjugate symmetry property in a kind of embodiment
Sequence diagram；
Fig. 9 is that every group of initial data length is 8 to be mapped as meeting the data of specific conjugate symmetry property in a kind of embodiment
Sequence diagram；
Figure 10 is that every group of initial data length is that M/2 is mapped as meeting the number of specific conjugate symmetry property in a kind of embodiment
According to sequence diagram；
Figure 11 is the flow chart that FBMC-OQAM system receiving terminal signal processing method is used in another embodiment；
Figure 12 is a kind of data sequence schematic diagram of specific conjugate symmetry property in implementation；
Figure 13 is the structural schematic diagram of low peak average ratio FBMC-OQAM system in another embodiment；
Figure 14 is a kind of peak-to-average force ratio PAPR performance simulation schematic diagram of FBMC-OQAM system in embodiment；
Figure 15 is that a kind of bit error rate BER of FBMC-OQAM system in embodiment emulates schematic diagram.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
The term definition used in the application: c
Overstriking lowercase represents row vector, such as a；
Overstriking capitalization represents matrix, such as A；
Subscript T represents the transposition of matrix；
Subscript H represents the conjugate transposition of matrix；
The lowercase of not overstriking represents scalar value, such as a；
Subscript *, represents conjugate；
J is imaginary unit；
To take real part to operate；
To take imaginary part to operate.
OFDM technology is one kind of multi-carrier modulation, can greatly improve the availability of frequency spectrum, and can be effectively right
Resistance to frequency selective decaying, is particularly suitable for the high-speed transfer of data.Due to it is various reduce ofdm system peak-to-average force ratios technologies in, in advance
Coding techniques has obtained extensive concern.At present in actual ofdm system, relatively good pre-coding matrix have DHT matrix,
WHT matrix and DFT matrix, can be effectively reduced ofdm system peak-to-average force ratio, and wherein effect most preferably uses DFT precoding.
Such as the uplink of LTE (Long Term Evolution, long term evolution), based on discrete Fourier transform (DFT,
Discrete Fourier Transform) coding ofdm system, i.e. DFT-s-OFDM (also referred to as SC-FDMA) becomes drop
The effective means of low PAPR.
The structure of the base band transmitting-receiving process system of SC-FDMA is referring to FIG. 1, be the ofdm system mould based on DFT precoding
Type structural schematic diagram, including transmitting terminal and receiving end.Transmitting terminal includes that serioparallel exchange, precoding, IFFT and signal emit and go here and there
Conversion.Receiving end includes that signal receives serioparallel exchange, FFT, demodulation, solution precoding and parallel-serial conversion.Set the son of ofdm system
Carrier number is M, reduces system peak-to-average ratio using pre-coding matrix before carrying out IFFT.It on the whole DFT and IFFT, can
To think that DFT-s-OFDM is exactly to be sampled rate transformation to the single-carrier modulated symbol of input, so be counted as single carrier,
Therefore PAPR is reduced.It is very restricted however, DFT and FBMC system is simply combined its effect.
Referring to FIG. 2, for a kind of baseband system model structure schematic diagram of FBMC-OQAM system in embodiment, including hair
Sending end and receiving end.Transmitting terminal includes serioparallel exchange, OQAM preprocessing module, IFFT module and multiphase filtering module, receiving end
Including multiphase filtering module, FFT module, OQAM post-processing module and parallel serial conversion module.Because the data of pre-transmission are plural number
According to, so first to pass through OQAM preprocessing module after pre-transmission data serioparallel exchange, what OQAM preprocessing module was used to input
Complex data is separated into two real datas, and is arranged in different subcarrier or symbol period.Purpose is by modulation data
Real and imaginary parts be separated into two real numbers to meet the orthogonal requirement of OQAM modulation real number, then by real and imaginary parts in the time
Upper alternating is aligned in two adjacent symbol periods, and multiplied by the phase on corresponding nth symbol period and m-th of subcarrier
Modulation factor jm+n, generate on subcarrier and symbol arrangement in the empty alternate data of reality, finally carry out IFFT subcarrier tune
System.That is OQAM modulation needs to separate the real imaginary part of the complex data of input, is arranged in different symbol periods.It please join
Fig. 3 is examined, is a kind of structural schematic diagram of the OQAM preprocessing module of FBMC-OQAM system in embodiment, sets FBMC-OQAM system
The number of sub carrier wave of system is M, and because of the complex data that the data of pre-transmission are modulation, then the road m enters data into OQAM and locates in advance
When managing module, by 2 times of real part up-samplings (zero insertion) of input data, by 2 times of imaginary part up-samplings (zero insertion) of input data and again
Postpone 1 data point, then respectively multiplied by the phase modulation factor j on nth symbol period and m-th of subcarrierm+n, realize
In the empty alternate data of reality on subcarrier and symbol arrangement.Referring to FIG. 4, for FBMC-OQAM in another embodiment
The structural schematic diagram of the OQAM preprocessing module of system, OQAM preprocessing module also can be used the input in nth symbol period
The real part of data is multiplied by phase modulation factor j2m+n, be then mapped on 2m subcarriers, by the imaginary part of input data multiplied by
Phase modulation factor j2m+1+n, then it is mapped on 2m+1 subcarriers, realizes on subcarrier and symbol arrangement in reality
Empty alternate data.Referring to FIG. 5, for a kind of structural representation of the OQAM post-processing module of FBMC-OQAM system in embodiment
Figure, the OQAM post-processing module of the receiving end of FBMC-OQAM system is corresponding the first OQAM preprocess method noted earlier,
It is to postpone a data point again for 2 times of received real part data down-sampled (extraction), 2 times of received imaginary data is down-sampled
(extraction) recovers the complex data of pre-transmission multiplied by j, last real and imaginary parts summation.
In order to reduce the PAPR of FBMC-OQAM system, the technology for being conventionally used to reduce ofdm system PAPR is applied to
FBMC system, such as pre-coding matrix is used for FBMC-OQAM system, referring to FIG. 6, pre- for directly DFT in a kind of embodiment
The structural schematic diagram of the FBMC-OQAM system of coding, including transmitting terminal and receiving end, transmitting terminal include preceding FFT module, OQAM pre-
Processing module, preceding IFFT module and multiphase filtering module, receiving end include multiphase filtering module, rear FFT module, demodulation output mould
Block, OQAM post-processing module and rear IFFT module.Transmitting terminal is grouped the initial data of pre-transmission, and to every group of original number
According to progress serioparallel exchange.Precoding will be carried out by preceding FFT module after every group of initial data progress M point modulation after serioparallel exchange,
It is handled again through traditional OQAM preprocessing module.The effect of OQAM preprocessing module is exactly by original data processing into satisfaction
The real empty alternately arranged pre-transmission data of FBMC-OQAM system reality orthogonal requirements.It is since OQAM modulation needs input data
It is purely real, therefore after OQAM modulation is sent into the output of precoding DFT in direct DFT precoding FBMC-OQAM scheme, real part
It can be placed on imaginary part on different subcarrier or FBMC symbol, therefore DFT precoding cannot restore OQAM signal completely
Single-carrier property.Detailed process is that preprocessed data is carried out to the modulation of serioparallel exchange, and setting M point modulation data input, M defeated
It is plural by the M point for DFT being encoded after M point quick Fourier transformation (FFT, Fast Fourier Transform) to enter complex signal
According to OQAM pretreatment is sent into, in OQAM preprocessing module, the real and imaginary parts for inputting complex data are respectively placed in front and back two
In a symbol period (or on two subcarriers), and phase factor item j is addedm+n, real empty alternate M point output data is generated, so
Real empty alternate M point output data is sent into IFFT module afterwards and carries out subcarrier-modulated, is just produced using after multiphase filtering
The baseband transmission signal of FBMC-OQAM, data information can be demodulated by then carrying out corresponding inverse operation in receiving end.However, i.e.
Make to use DFT precoding, subsequent OQAM pretreatment has separated the real imaginary part of DFT output data, namely is modulated at subcarrier
On data be real empty alternate data, rather than the direct output valve of DFT, therefore can not be with subsequent IFFT subcarrier-modulated
Module forms inverse transformation relationship, therefore direct DFT precoding is added to FBMC-OQAM system and cannot recover single carrier completely
Characteristic.
In embodiments of the present invention, first the initial data of pre-transmission is grouped, and every group of initial data is gone here and there
And convert, it is each mapped to every group of initial data after serioparallel exchange to meet the data sequence of specific conjugate symmetry property, and
DFT precoding is carried out to the data sequence of every group of mapping again, respectively to obtain the reality for meeting FBMC-OQAM system reality orthogonal requirements
Empty alternately arranged pre-transmission data.
Embodiment one:
Referring to FIG. 7, for a kind of flow chart of low peak average ratio FBMC-OQAM signal processing method in embodiment, this method
Include:
Step 1 is grouped the initial data of pre-transmission, and carries out serioparallel exchange to every group of initial data.
In one embodiment, the length of every group of initial data is set as M/2, wherein M is the subcarrier of FBMC-OQAM system
Number, M=2L, the value range of L is the natural number more than or equal to 2.
Step 2 is each mapped to every group of initial data after serioparallel exchange to meet the data of specific conjugate symmetry property
Sequence.
Meet the data sequence of specific conjugate symmetry property, for the data sequence for meeting following formula:
Wherein, b (k) is k-th of data in data sequence, and sequence length M, λ=± j or ± 1 is invariant,To take imaginary part to operate.
It is each mapped to every group of initial data after serioparallel exchange to meet the data sequence of specific conjugate symmetry property, wrap
It includes:
For any n-th group initial data vector xnIt indicates, this group of initial data xnThe n-th group of data sequence of mapping is used
Vector bnIt indicates；
The n-th group initial data xnIt is mapped as meeting the n-th group of data sequence of specific conjugate symmetry property as follows
Arrange bn:
Wherein, the value range of n is nonnegative integer；xn(k) it is expressed as n-th group initial data xnIn k-th of data；bn
(k) it is expressed as n-th group of data sequence bnIn k-th of data；Indicate the representative conjugate of subscript *；To take real part to operate；To take imaginary part to operate.
As shown in figure 8, being 4 to be mapped as meeting specific conjugate symmetry property for every group of initial data length in a kind of embodiment
Data sequence schematic diagram, in an embodiment, when every group of initial data length is 4, the subcarrier number of FBMC-OQAM system
It is 8, the j in b (k) value is omitted in the embodiment in order to facilitate understandingn?.Assuming that every group of original data sequence is x=[x
(0),x(1),x(2),x(3)]T, then the data sequence of the specific conjugate symmetry property after mapping is b=[b (0), b (1) ..., b
(7)]T.Wherein, in data sequence b b (0)~b (7) value be successively respectively x (0), x (1),x*(1)、x*(0)、
x(3)、And x*(3).B (2) and b (6) is the singular point of the data sequence of the specific conjugate symmetry property of the group, value point
It is notWithB (1) and b (3) is symmetrical relative to singular point b (2) conjugation, and the value of b (5) and b (7) are opposite
In singular point b (6), conjugation is symmetrical.
As shown in figure 9, being 8 to be mapped as meeting specific conjugate symmetry property for every group of initial data length in a kind of embodiment
Data sequence schematic diagram, in an embodiment, when every group of initial data length is 8, the subcarrier number of FBMC-OQAM system
It is 16, b is omitted in order to facilitate understanding in the embodimentn(k) j relevant to n in valuen?.Assuming that every group of original data sequence
For x=[x (0), x (1) ..., x (7)]T, then the data sequence of the specific conjugate symmetry property after mapping is b=[b (0), b
(1), b (2) ..., b (15)]T.Wherein, b (0)~b (15) value is x (0), x (1), x (2), x respectively in data sequence b
(3)、x*(3)、x*(2)、x*(1)、x*(0)、x(5)、x(6)、x(7)、x*(7)、x*(6) and x*
(5).B (0), b (1), b (2) and b (3) are symmetrical relative to singular point b (4) and b (5), b (6) and b (7), b (8) conjugation, b (9), b
(10) and b (11) is symmetrical relative to singular point b (12) and b (13), b (14) and b (15) conjugation.
It as shown in Figure 10, is that M/2 is mapped as meeting specific conjugation symmetrically for every group of initial data length in a kind of embodiment
The data sequence schematic diagram of characteristic, when every group of initial data length is M/2, the subcarrier number of FBMC-0QAM system is M,
Then the data sequence of the specific conjugate symmetry property of the group includes 2 singular points, is b (M/4) and b (3M/4) respectively.Except this 2 singular points
The data of outer b (M/4) and the two sides b (3M/4) are respectively that center position conjugate is symmetrical with respect to b (M/4) and b (3M/4), positive backslash
Indicate two pairs of symmetrical data blocks of conjugation, wherein also mutually conjugation is symmetrical by b (0) and b (M/4).
Step 3 carries out DFT precoding to the data sequence of every group of mapping respectively.
DFT precoding is carried out respectively by the data sequence to every group of mapping, is meeting FBMC-OQAM system in fact just to obtain
Hand over desired real empty alternately arranged pre-transmission data.In one embodiment, the data of specific conjugate symmetry property are met to every group
Sequence carries out FFT conversion respectively.Data sequence after DFT precoding can meet the real empty of FBMC-OQAM system reality orthogonal requirements
It is alternately arranged, that is, completes the preprocessing process to the pre-transmission data of FBMC-OQAM system.
In one embodiment, this method is further comprising the steps of:
Step 4, using every group of data sequence after DFT precoding as the tune of a symbol period of FBMC-OQAM system
Data processed carry out IFFT conversion, to complete subcarrier-modulated.In one embodiment, a symbol period of FBMC-OQAM system is
T, T=1/2F, wherein F is subcarrier bandwidth.
Step 5 will complete every group of data sequence of subcarrier-modulated by being used as baseband transmission signal after multiphase filter
It sends.
Figure 11 is please referred to, for the process for being used for FBMC-OQAM system receiving terminal signal processing method in another embodiment
Scheme, in an embodiment, also disclose a kind of signal processing method for FBMC-OQAM system receiving terminal, comprising:
Step 1, the receiving end of FBMC-OQAM system by received baseband signal through multiphase filtering, FFT subcarrier demodulation,
Balanced and OQAM demodulation operation, to obtain real data.
Step 2, addition phase factor.
After the demodulation of OQAM real data, also each real data in the FBMC-OQAM system same symbol period is added
Add phase factor, is the real data for demodulating m subcarriers in the nth symbol of FBMC-OQAM system in an embodiment
Multiplied by phase factor jm, so that receiving real data in each symbol period of FBMC-OQAM system is converted into real empty friendship
For the data sequence of arrangement；Wherein, the value range of m is 0,1,2 ..., M.M is the active sub-carriers of FBMC-OQAM system
Number.
Step 3, the real number after addition phase factor is received data progress IFFT conversion solution to encode, can obtains meeting spy
Determine the data sequence of conjugate symmetry property
Step 4, by receiving end data sequenceDemapping operation is carried out, to obtain the estimated value of initial data.
In one embodiment, for the receiving end conjugate symmetric data sequence vector in any nth symbol periodTable
Show, the data sequence in the symbol periodThe estimated value vector for the n-th group initial data that demapping operation obtainsTable
Show；
The then receiving end conjugate symmetric data sequence in the nth symbol periodDemapping is that n-th group is former as follows
The estimated value of beginning data
Wherein, the value range of n is nonnegative integer；Data sequenceLength is M；It is expressed as n-th group original number
According to estimated valueIn k-th of data；The data sequence being expressed as in the nth symbol periodIn k-th
Data；Indicate the representative conjugate of subscript *；To take real part to operate；To take imaginary part to operate.
Step 5, it will be exported after the estimated value parallel-serial conversion of initial data.
After the estimated value for obtaining n-th group initial data, carrying out serioparallel exchange output to the estimated value of n-th group initial data should
The estimated value of initial data.
Since when FBMC-OQAM system subcarrier, which is modulated, carries out IFFT conversion, the data bulk of input is that (M is M
FBMC-OQAM system subcarrier quantity) it is a, input data is real number and the alternate data symbols of imaginary number in the arrangement of subcarrier serial number
Number, therefore the output after its IFFT conversion is that have conjugate symmetry property described in this patent, in the embodiment of the present application, is passed through
DFT coding realizes the characteristic of the low PAPR of single carrier of FBMC-OQAM system, will according to the time-frequency duality relation of Fourier transformation
Original M/2 complex data is mapped as being conjugated symmetrical M point complex signal, which directly can produce M after passing through DFT precoding
The real empty alternate signal of point, therefore IFFT conversion directly can be carried out no longer by the subcarrier-modulated of FBMC-OQAM system
It needs to carry out the pretreatment of OQAM again and keeps identical spectrum efficiency, therefore the program can restore FBMC-OQAM system completely
The single-carrier property of system modulation, can be significantly reduced the peak-to-average force ratio of FBMC-OQAM system signal.
Embodiment two
The present embodiment is the implementation that this patent scheme is explained from the principle of FBMC multi-carrier modulation band processing system
Thought.Because FBMC-OQAM baseband transmission signal is formed by stacking by M sub-carrier signal, therefore PAPR with higher.For drop
DFT precoding can be used in low PAPR in an ofdm system, baseband transmission signal can be reverted to single carrier form.It is same similar
Thought can also apply in FBMC-OQAM system, such as the baseband transmission signal s of the FBMC-OQAM comprising M subcarrier
(t) it can indicate are as follows:
Wherein, (m, n) represents m-th of subcarrier and nth symbol period,For on corresponding subcarrier and symbol period
The real data symbol of transmission, jm+nIt is OQAM phase modulation because of subitem, p (t) is ptototype filter, and T is symbol period, and F is son
Carrier wave interval, and meet TF=1/2.
If with Ts=fsBaseband transmission signal s (t) is sampled for the period, wherein fsFor sampling rate, the application reality
It applies in example, it is assumed that fs=MF, then discrete baseband transmission signal s (k) can indicate are as follows:
Wherein, k is discrete sampling serial number.
According to (4) and (5) formula, the real empty alternate data vector of the input for entering IFFT module by OQAM pretreatment can be with table
It is shown asWherein:
According to the property of Fourier transformation,Inverse Fourier transform result anWith conjugate symmetry matter, figure is please referred to
12, for the data sequence schematic diagram of specific conjugate symmetry property in an implementation.
Specifically, the output sequence a of observation inverse Fourier transformnIn k-th of element a (k), by Fourier transform formula
It can obtain:
IfThenA element can be expressed as
Similarly, forThen the M-k element can be expressed as
That is comprising two sections of symmetrical sequences of conjugation in IFFT output sequence an, and respectively withWithFor in
Heart point conjugation is symmetrical.AndWithThe numerical value of two points according to Fourier transform formula it can be concluded that for phase because
Sub- jnWith the product of a real number.
To make DFT precoding offset subsequent IFFT subcarrier-modulated operation, improved DFT is proposed in an embodiment
Precoding FBMC-OQAM system, by the data sequence that input data is mapped as to specific conjugate symmetry property as shown in figure 12
Column, and multiplied by phase factor item jn, by the time-frequency duality relation of Fourier transformation it can be found that at this moment bnAfter FFT
It obtains originalThe real empty alternate OQAM of form pre-processes output data, thus using subcarrier-modulated IFFT after, i.e.,
It can revert to bnSequence is the single-carrier modulated signal of data, namely this conjugation symmetrical mapping side proposed by this patent
FBMC-OQAM transmission signal can also be reverted to single-carrier signal, significantly reduced by formula similar to SC-FDMA or DFT-s-OFDM
The PAPR of FBMC-OQAM signal.Equally receiving end carry out corresponding OQAM demodulation, addition phase factor and IFFT solution coding and
Corresponding demapping operation can demodulate original transmission data xn。
Figure 13 is please referred to, for the structural schematic diagram of low peak average ratio FBMC-OQAM system in another embodiment, including transmission
End and receiving end.
FBMC-OQAM system transmitting terminal includes preprocessing module and sending module.Preprocessing module is used for pre-transmission
Initial data is pre-processed, to obtain the real empty alternately arranged pre-transmission number for meeting FBMC-OQAM system reality orthogonal requirements
According to.Sending module only describes baseband system for sending pretreated pre-transmission data from transmitting terminal in this patent
Processing, the intermediate frequencies such as modulus/digital-to-analogue conversion, amplifier, frequency mixer, radio-frequency filter, antenna and RF processing unit is omitted.
Wherein, preprocessing module includes preceding serioparallel exchange module 21, the symmetrical mapping block 22 of conjugation, preceding FFT module 23, preceding IFFT module
24 and preceding multiphase filtering module 25.Preceding serioparallel exchange module 21 is used to be grouped the initial data of pre-transmission, and to every group
Initial data carries out serioparallel exchange.In one embodiment, the length of every group of initial data is set as M/2, wherein M is FBMC-OQAM
The subcarrier number of system, M=2L, the value range of L is the natural number greater than 2.
It is specific total for every group of initial data after serioparallel exchange to be each mapped to meet to be conjugated symmetrical mapping block 22
The data sequence of yoke symmetry characteristic, the data sequence length after mapping are M.Meet the data sequence of specific conjugate symmetry property,
For the data sequence for meeting following formula:
Wherein, b (k) is k-th of data in data sequence, and λ=± j or ± 1 is invariant.
It is each mapped to every group of initial data after serioparallel exchange to meet the data sequence of specific conjugate symmetry property, wrap
It includes:
For any n-th group initial data vector xnIt indicates, this group of initial data xnThe n-th group of data sequence of mapping is used
Vector bnIt indicates；
N-th group initial data xnIt is mapped as meeting the n-th group of data sequence b of specific conjugate symmetry property as followsn:
Wherein, the value range of n is nonnegative integer；xn(k) it is expressed as n-th group initial data xnIn k-th of data；bn
(k) it is expressed as n-th group of data sequence bnIn k-th of data；
Preceding FFT module 23 meets FBMC- for carrying out DFT precoding respectively to the data sequence of every group of mapping, to obtain
The real empty alternately arranged pre-transmission data of OQAM system reality orthogonal requirements.After preceding IFFT module 24 is used for DFT precoding
Data sequence carries out IFFT conversion, that is, carries out the subcarrier-modulated of FBMC-OQAM system.Preceding multiphase filtering module 25 is used for will be sub
Data sequence signal after carrier modulation carries out multiphase filtering and exports baseband transmission signal, through intermediate frequency and RF processing unit into
It is sent after row Carrier Modulation to channel 26.
FBMC-OQAM system receiving terminal includes receiving module and post-processing module, and receiving module is used for received base band
Signal is through multiphase filtering, FFT subcarrier demodulation, equilibrium and OQAM demodulation operation, and to obtain real data, post-processing module is used
After real data addition phase factor, IFFT conversion, demapping and the serioparallel exchange operation obtained to the receiving module, make
For the output data of the FBMC-OQAM system.
Receiving module includes rear multiphase filtering module 31, rear FFT module 32 and demodulation output module 33, rear multiphase filtering mould
Block 31, rear FFT module 32 and demodulation output module 33 are respectively used to that multiphase filtering, FFT will be carried out from 26 received signal of channel
Subcarrier demodulation, equilibrium and OQAM demodulation operation.In one embodiment, demodulation output module 33 uses tradition FBMC-OQAM system
OQAM post-processing module will as shown in figure 5, postpone a data point again for 2 times of received real part data down-sampled (extraction)
2 times of received imaginary data down-sampled (extraction) recovers answering for pre-transmission multiplied by j, last real and imaginary parts summation
Number data.
Post-processing module includes that addition phase factor module 34, rear IFFT module 35, De-mapping module 36 and rear and string turn
Change the mold block 37.Phase factor module 34 is added, for adding to each real data in the FBMC-OQAM system same symbol period
Add phase factor.In one embodiment, addition phase factor module 34 is used for the receiving end data sequence after OQAM demodulation operation
It is added the operation of phase factor, is the real number number for demodulating m subcarriers in the nth symbol of FBMC-OQAM system
According to multiplied by phase factor jm, so that receiving real data in each symbol period of FBMC-OQAM system is converted into one group
Real empty alternately arranged data sequence, wherein the value range of n is natural number, and the value range of m is 0,1,2 ..., M.
IFFT module 35 is used to carry out IFFT conversion to the real data of addition phase factor afterwards, is met with acquisition specific total
The receiving end data sequence of yoke symmetry characteristic.De-mapping module 36 is used to the receiving end data sequence carrying out demapping behaviour
Make, to obtain the estimated value of initial data.In one embodiment, for the data sequence vector in any nth symbol periodIt indicates, the data sequence in the symbol periodThe estimated value vector for the n-th group initial data that demapping operation obtainsIt indicates；
Then, the data sequence in the nth symbol periodDemapping is the estimation of n-th group initial data as follows
Value
Wherein, the value range of n is natural number；It is expressed as the estimated value of n-th group initial dataIn kth
A data；The data sequence being expressed as in the nth symbol periodIn k-th of data；Sequence length is M；Sequence length is M/2.
Serioparallel exchange module 37 is used to that the FBMC-OQAM will to be used as after the estimated value parallel-serial conversion of the initial data afterwards
The output data of system.In one embodiment, obtain n group initial data estimated value after, to simultaneously n group initial data estimated value into
Row string conversion exports the estimated value of the initial data.
Figure 14 and Figure 15 are please referred to, is that the peak-to-average force ratio PAPR performance simulation of FBMC-OQAM system in an embodiment shows respectively
It is intended to and bit error rate BER emulates schematic diagram, wherein with number of subcarriers M is 64, subcarrier bandwidth is 15KHz and 4QAM star
For the system of seat modulation, Figure 14 and Figure 15 be set forth example signal peak-to-average force ratio PAPR performance and bit error rate (BER,
Bit Error Ratio) schematic diagram.As can be seen that this Shen from each signal peak-to-average ratio Cumulative Distribution Function curve of Figure 14
Probability of the DFT extended coding DFT-s-FBMC signal at most of peak-to-average force ratio decibel (dB, decibel) values point in please implementing
Cloth functional value is significantly less than the FBMC-OQAM signal of non-extended coding, similarly less than tradition directly DFT-s-FBMC and optimal
The DFT-s-FBMC system of phase, this illustrates the DFT coding FBMC-OQAM signal of this application compared to other above-mentioned three kinds of systems
With lower peak-to-average force ratio.The errored bit modulated using 16QAM under ITU vehicular-A channel is illustrated in Figure 15
Rate performance, since spread coded signals have the diversity in frequency, it may be said that the DFT that bright the application is proposed, which extends, to be compiled
The bit error rate curve of code FBMC-OQAM (DFT-s-OFDM) system and the bit error rate curve of SC-FDMA are close, in identical letter
It makes an uproar than lower lower than uncoded FBMC-OQAM system, more demonstrates the validity and correctness of technical scheme.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of low peak average ratio FBMC-OQAM signal processing method characterized by comprising
The initial data of pre-transmission is grouped, and serioparallel exchange is carried out to every group of initial data；
It is each mapped to every group of initial data after serioparallel exchange to meet the data sequence of specific conjugate symmetry property；
The data sequence mapped every group carries out DFT precoding respectively, meets that FBMC-OQAM system is orthogonal in fact to be wanted to obtain
The real empty alternately arranged pre-transmission data asked.
2. the method as described in claim 1, which is characterized in that the length of every group of initial data is M/2, and wherein M is FBMC-
The subcarrier number of OQAM system, the data sequence length after being conjugated symmetrical mapping are M, M=2L, the value range of L be greater than
Natural number equal to 2.
3. method according to claim 2, which is characterized in that the data sequence for meeting specific conjugate symmetry property is
Meet the data sequence of following formula:
Wherein, b (k) is k-th of data in data sequence, and sequence length M, λ=± j or ± 1 is invariant,For
Imaginary part is taken to operate.
4. method according to claim 2, which is characterized in that every group of initial data by after serioparallel exchange maps respectively
For the data sequence for meeting specific conjugate symmetry property, comprising:
For any n-th group initial data vector xnIt indicates, this group of initial data xnThe n-th group of data sequence vector of mapping
bnIt indicates；
The n-th group initial data xnIt is mapped as meeting the n-th group of data sequence b of specific conjugate symmetry property as followsn:
Wherein, the value range of n is nonnegative integer；xn(k) it is expressed as n-th group initial data xnIn k-th of data；bn(k) table
It is shown as n-th group of data sequence bnIn k-th of data；Indicate the representative conjugate of subscript *；To take real part to operate；
To take imaginary part to operate.
5. method according to claim 2, which is characterized in that further include:
It is carried out every group of data sequence after DFT precoding as the modulation data of a symbol period of FBMC-OQAM system
IFFT conversion, to complete subcarrier-modulated；One symbol period of FBMC-OQAM system is T, T=1/ (2F), wherein F is son
Carrier bandwidths；
Every group of data sequence for completing subcarrier-modulated is sent into signal as base band by output after multiphase filter.
6. a kind of data processing method of low peak average ratio FBMC-OQAM characterized by comprising
The receiving end of FBMC-OQAM system is by received baseband signal through multiphase filtering, FFT subcarrier demodulation, equilibrium and OQAM
Demodulation operation, to obtain the real data of demodulation；
Phase factor is added to each real data in the FBMC-OQAM system same symbol period, and carries out IFFT conversion, with
Obtain the receiving end conjugate symmetric data sequence for meeting specific conjugate symmetry property；
The receiving end conjugate symmetric data sequence is subjected to demapping operation, to obtain the estimated value of initial data；
It will be exported after the estimated value parallel-serial conversion of the initial data.
7. method as claimed in claim 6, which is characterized in that described to every in the FBMC-OQAM system same symbol period
A real data adds phase factor, comprising:
The real data that m subcarriers in the nth symbol of FBMC-OQAM system are demodulated is multiplied by phase factor jm, so that
Real data is received in each symbol period of FBMC-OQAM system is converted into one group of real empty alternately arranged data sequence；
Wherein, the value range of n is natural number, and the value range of m is 0,1,2 ..., M；M is the active sub-carriers of FBMC-OQAM system
Number.
8. method as claimed in claim 6, which is characterized in that described to solve the receiving end conjugate symmetric data sequence
Map operation, to obtain the estimated value of initial data, comprising:
For the receiving end conjugate symmetric data sequence vector in any nth symbol periodIt indicates, in the symbol period
Data sequenceThe estimated value vector for the n-th group initial data that demapping operation obtainsIt indicates；
Receiving end conjugate symmetric data sequence in the nth symbol periodDemapping is that n-th group is original as follows
The estimated value of data
Wherein, data sequenceLength is M；The value range of n is nonnegative integer；It is expressed as n-th group initial data
Estimated valueIn k-th of data；The data sequence being expressed as in m-th of symbol periodIn k-th of data；
Indicate the representative conjugate of subscript *；To take real part to operate；To take imaginary part to operate.
9. a kind of low peak average ratio FBMC-OQAM system characterized by comprising
Preprocessing module is pre-processed for the initial data to pre-transmission, and it is orthogonal in fact to meet FBMC-OQAM system with acquisition
It is required that real empty alternately arranged pre-transmission data；
Sending module, for the pretreated pre-transmission data to be carried out the FBMC systems such as subcarrier-modulated, multiphase filtering
Base band signal process operation, and complete Carrier Modulation, filtering, amplification etc. and be sent in channel；
The preprocessing module includes:
Preceding serioparallel exchange module is grouped for the initial data to pre-transmission, and every group of initial data is gone here and there and turned
It changes；
It is conjugated symmetrical mapping block, meets specific conjugation symmetrically for every group of initial data after serioparallel exchange to be each mapped to
The data sequence of characteristic；
Preceding FFT module carries out DFT precoding for the data sequence to every group of mapping respectively, meets FBMC-OQAM system to obtain
The real empty alternately arranged pre-transmission data of reality of uniting orthogonal requirements.
10. a kind of low peak average ratio FBMC-OQAM system characterized by comprising
Receiving module, for that will be solved from the received baseband signal of channel through multiphase filtering, FFT subcarrier demodulation, equilibrium and OQAM
Operation is adjusted, to obtain real data；
Post-processing module, for being obtained to the receiving module real data addition phase factor, IFFT conversion, demapping and
After serioparallel exchange operation, the last demodulation output data as the FBMC-OQAM system；
The post-processing module includes:
Phase factor module is added, for adding to each real solution adjusting data in the FBMC-OQAM system same symbol period
Phase factor；
IFFT module afterwards carries out IFFT conversion for the real data to addition phase factor, meets specific conjugate pair to obtain
Claim the receiving end data sequence of characteristic；
De-mapping module, for the receiving end data sequence to be carried out demapping operation, to obtain the estimated value of initial data；
Serioparallel exchange module afterwards, for being used as the FBMC-OQAM system after the estimated value parallel-serial conversion by the initial data
Last demodulation output data.
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