CN109600332A - A kind of modulator approach and system of CO-FBMC/OQAM - Google Patents
A kind of modulator approach and system of CO-FBMC/OQAM 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
- H04L27/2626—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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- 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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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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
Abstract
The invention discloses the modulator approach of CO-FBMC/OQAM a kind of and systems, including disappear and disturb pilot module and Kalman filtering compensating module；It is described to disappear that disturb pilot module include the both ends that the first pilot cell and the second pilot cell are respectively placed in symbol mapping block, for removing the intrinsic imaginary part interference at pilot frequency locations, and guarantee that each CO-FBMC/OQAM symbol has the phase noise of frequency pilot sign face superposition recorded thereon；Kalman filtering compensating module extracts the test frequency pilot sign of receiving end, corrects to the prediction process of frequency pilot sign, obtains the phase noise estimated value at current time, and then export the estimated value of receiver signal.The technical program has solid noisy ability at pilot frequency locations of eliminating, while Kalman filtering processing module need to only carry out operation using a pilot tone, therefore the technical solution reduces calculation amount and reduces the ability of decision error.
Description
Technical field
The invention belongs to optical communication fields, more particularly, to the modulator approach and system of a kind of CO-FBMC/OQAM.
Background technique
Coherent light filter bank multi-carrier in traditional optic communication/Offset Quadrature Amplitude modulation (CO-FBMC/OQAM:
Coherent Optical-offset Quadrature Amplitude Modulation-based filter bank
Multicarrier) although system eliminates cyclic prefix and is better than CO-OFDM system to a certain extent, but due to CO-
FBMC/OQAM system has longer symbol lengths and high peak-to-average power ratio, and phase noise is mainly from laser linewidth
And link non-linear, so influence of the transmission performance of CO-FBMC/OQAM system vulnerable to phase noise, generates receiving end QAM modulation
The rotation of planisphere is with diverging so as to cause the increase of the bit error rate.Therefore, how efficiently to monitor and compensate phase noise is CO-
One critical issue of FBMC/OQAM system, wherein it is necessary that the intrinsic imaginary part interference of system becomes phase noise Processing Algorithm
The problem to be solved.
The existing scheme for solving the estimation of system phase noise and compensating is the Kalman filtering algorithm compensation based on blind judgement
Scheme, not only computation complexity is higher for the compensation scheme, and due on each symbol for blind judgement overlapping system it is solid
Noisy influence easily generates judgement fault, therefore the program compensation range pole when laser phase noise is larger
Its is limited.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to the fixations after the symbol mapping block that system is started
Sub-carrier positions addition, which disappears, disturbs pilot module, is corresponding to pilot tone addition after area of light-frequency domain conversion module of system receiving end
Position increase Kalman filtering processing module, it is intended to solve the intrinsic imaginary part of system and interfere to pilot tone bring evaluated error and receipts
Hold corresponding phase noise compensation problem.
To achieve the above object, on the one hand, the present invention provides the modulator approaches of CO-FBMC/OQAM a kind of, comprising:
(1) PAM data symbol is converted by the bit signal that CO-FBMC/OQAM system inputs；
(2) three column subcarriers are accessed in one end of PAM data symbol, places pilot tone symbol in the odd bits of middle column subcarrier
Number, even bit place zero setting symbol and remaining two equal zero setting of column subcarrier, complete connecing for PAM data symbol and the first pilot cell
Enter；
(3) three column subcarriers are accessed in the other end of PAM data symbol, places pilot tone in the even bit of middle column subcarrier
Symbol, odd bits placement zero setting symbol and remaining two equal zero setting of column subcarrier, completion PAM data symbol and the second pilot cell
Access；
(4) first pilot cells and the second pilot cell receive PAM data symbol, eliminate the intrinsic imaginary part interference of system, and
Record the phase information of pilot frequency locations；
(5) frequency-time domain conversion module is received by pilot cell treated frequency-region signal, is pre-processed to its orthogonalization
After be modulated, complete frequency-region signal to time-domain signal conversion；
(6) time-domain signal obtained, which carries out IQ modulation after parallel-serial conversion and training sequence processing, is transmitted to its signal
System receiving end；
(7) received area of light signal is passed through the base band obtained after coherent detection balance reception by area of light-frequency domain conversion module
Signal；
(8) baseband signal is obtained into frequency-region signal by demodulation after Timing Synchronization and serioparallel exchange；
(9) the test pilot signal of the receiving end of pilot frequency locations is extracted；
(10) the known pilot signal that will start is multiplied with the phase noise estimated value of last moment obtains the originator pilot tone
The predicted value of the corresponding receiving end pilot signal of signal；
(11) predicted value of the test pilot signal of receiving end and pilot signal is subtracted each other to obtain error signal between the two.
(12) error signal is multiplied to obtain the correction value of phase noise with fixed kalman gain；
(13) the obtained value that is multiplied is added to obtain the phase at current time with the phase noise estimated value of last moment
Position noise estimation value；
(14) conjugation that the phase noise estimated value at current time carries out phase noise is handled；
(15) be multiplied the conjugate of phase noise with the frequency pilot sign of receiving end the estimated value after obtaining phase noise compensation
Signal as phase noise compensation；
(16) output signal of phase compensation is restored into bit signal after demapping；
(17) the phase noise estimated value at current time carries out phase noise estimated value of the delay disposal as previous moment.
On the other hand, the present invention provides a kind of CO-FBMC/OQAM system, including symbol mapping block, disappear and disturb pilot tone mould
Block, frequency-time domain conversion module, IQ modulation module, area of light-frequency domain conversion module, Kalman filtering compensating module and symbolic solution
Mapping block；
The symbol mapping block is used to receive the bit data by serioparallel exchange, and output signal turns real by plural number
Number, real-valued signal is passed to disappear and disturbs pilot module；
Described disappear disturbs pilot module for receiving the real-valued signal of symbol mapping block transmitting, and it is inherently dry that pilot tone is eliminated in output
The frequency-region signal disturbed, while pilot signal is added at symbol mapping block both ends, for the phase information in recorded pilot signal
Obtain influence of the phase noise to system；
Preferably, it is described disappear disturb pilot module include the first pilot cell and the second pilot cell；The first pilot tone list
Member and the second pilot cell include 3 column subcarriers, and the subcarrier frequency pilot sign positioned at middle column is alternate with zero setting symbol, remaining
The frequency pilot sign of the two equal zero setting of column subcarrier, first pilot cell and the second pilot cell is individually positioned in corresponding subcarrier
Odd positions and even number position；
The frequency-time domain conversion module is used to receive the frequency-region signal of pilot module transmitting, output time-domain signal；
The IQ modulation module exports area of light signal for receiving time-domain signal；
The area of light-frequency domain conversion module exports frequency-region signal for receiving area of light signal；
The Kalman filtering compensating module disturbs module elimination frequency pilot sign based on described disappearing and consolidates noisy state, uses
In calculating the phase noise value on pilot frequency symbol position, so that the compensation of phase noise is carried out, after final output phase compensation
Frequency-region signal；
Preferably, the Kalman filtering compensating module includes: pilot extraction unit, subtracter, and the first multiplier adds
Musical instruments used in a Buddhist or Taoist mass, delay cell, the second multiplier are conjugated processing unit, third multiplier；
The pilot extraction unit input terminal connects area of light-frequency domain conversion module, and output end connects subtracter；
The output end of the subtracter input terminal connection pilot extraction unit and the output end of the second multiplier, output end connect
Connect the input terminal of the first multiplier；
The output end of the first multiplier input connection subtracter, receives fixed kalman gain；Output end connection
Connect the input terminal of adder；
The input terminal of the adder connects the output end of the first multiplier and the output end of delay cell, output end connection
The input terminal of delay cell and the input terminal of conjugation processing unit；
The input terminal and second of the output end of the delay cell input terminal connection adder, output end connection adder multiplies
The input terminal of musical instruments used in a Buddhist or Taoist mass；
The output end of the second multiplier input connection delay unit；
The output end of the conjugation processing unit input terminal connection adder, output end connect the input of third multiplier
End；
The output end of the input terminal connection conjugation processing unit of the third multiplier, output end connect real complex conversion mould
Block；
The pilot extraction unit is for extracting pilot signal in receiving end pilot tone；
The subtracter is used to that the pilot signal of the pilot signal of receiving end and prediction to be subtracted each other to obtain the letter of error between the two
Number；
First multiplier is used for error signal and fixed Kalman's multiplied by gains；
The adder is worked as the result that multiplier obtains to be added with the phase noise estimated value of last moment
The phase noise estimated value at preceding moment；
The delay cell is for estimating the phase noise that the phase noise estimated value at current time is converted into previous moment
Evaluation；
Second multiplier is multiplied for the pilot signal that will start with upper moment phase noise estimated value, obtains pre-
The corresponding reception pilot value of the frequency pilot sign of survey；
The conjugation processing unit is used to obtain the conjugate of the phase noise at current time；
The third multiplier is used for the conjugate of the phase noise at current time and the frequency pilot sign of receiving end is mutually multiplied
Estimated value after to phase noise compensation；
The symbol de-maps module is used to receive frequency-region signal of the frequency-region signal after real number turns plural number, exports bit number
According to.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) present invention disturbs pilot module and can make frequency pilot sign not by intrinsic in CO-FBMC/OQAM system using disappearing
The influence of imaginary part interference, to improve the accuracy that system estimates phase noise.
(2) what the present invention used disappears and disturbs pilot module, it is ensured that each FBMC symbol only with a pilot tone
Phase noise is recorded, each subcarrier can be intended to calculate to solve thereon to avoid needed for blind decision algorithm
The drawbacks of phase noise, so as to be significantly reduced computation complexity.
It (3), can be to avoid present invention employs the estimation for carrying out phase noise based on the Kalman filtering algorithm of pilot tone
Judging process needed for blind estimate, so as to avoid the introducing of decision error.
Detailed description of the invention
Fig. 1 is that provided in an embodiment of the present invention disappear disturbs the structural design drawing of pilot module；
Fig. 2 is Kalman filtering processing module structure chart provided by the invention；
Fig. 3 is CO-FBMC/OQAM system schematic provided by the invention；
Fig. 4 is the CO-FBMC/OQAM system schematic of 16QAM modulation provided in this embodiment；
Fig. 5 is simulation result provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of modulator approaches of CO-FBMC/OQAM system, comprising:
S1: symbol mapping block receives the binary input bits signal after serioparallel exchange, and the signal of output is by multiple
Several real numbers that turn are converted into PAM data symbol；
S2: it is respectively connected to disappear at the both ends of PAM data symbol and disturbs the first pilot cell and the second pilot tone list of pilot module
Member；
S3: frequency-time domain conversion module is received by pilot cell treated frequency-region signal, is pre-processed to its orthogonalization
After be modulated, complete frequency-region signal to time-domain signal conversion；
S4: the time-domain signal of acquisition carries out orthogonal (IQ:in-phase and after parallel-serial conversion and training sequence processing
Quadraturemodulation) modulation makes its signal be transmitted to system receiving end
S5: received area of light signal is converted into frequency-region signal by area of light-frequency domain conversion module, is compensated by Kalman filtering
Module compensates phase noise；
S6: the output signal of phase compensation is restored into bit signal after symbol de-maps module.
Fig. 1 is that provided by the invention disappear disturbs pilot module and pulse amplitude modulation (PAM:Pulse Amplitude
Modulation) the connection relationship between data symbol, as shown in Figure 1, the step S2 specifically comprise the following steps:
S2.1: setting three is listed, and wave makes the odd bits of middle column subcarrier place frequency pilot sign, even bit places zero setting symbol
Number and remaining two equal zero setting of column subcarrier, complete the first pilot cell setting；
S2.2: setting three is listed, and wave makes the odd bits of middle column subcarrier place frequency pilot sign, even bit places zero setting symbol
Number and remaining two equal zero setting of column subcarrier, complete the first pilot cell setting；
S2.3: the first pilot cell and the second pilot cell are connected to PAM data symbol both ends.
Fig. 2 is the concrete structure schematic diagram that Kalman filtering compensating module provided by the invention calculates, according to Fig.2,
Step S5 described in Kalman's phase compensating method specifically comprises the following steps:
S5.1: the test pilot signal of pilot extraction unit extraction pilot frequency locations receiving end；
S5.2: the known pilot signal that will start is multiplied with the phase noise estimated value of last moment obtains the originator pilot tone
The predicted value of the corresponding receiving end pilot signal of signal；
S5.3: the predicted value of the test pilot signal of receiving end and pilot signal is subtracted each other to obtain error signal between the two.
S5.4: the error signal is multiplied to obtain the correction value of phase noise with fixed kalman gain；
S5.5: the obtained value that is multiplied is added the phase as current time in the phase noise estimated value with last moment
Position noise estimation value；
S5.6: the conjugation that the phase noise estimated value at current time carries out phase noise is handled；
S5.7: the conjugate of phase noise is multiplied with the frequency pilot sign of receiving end the estimated value after obtaining phase noise compensation
Signal as phase noise compensation；
S5.8: the phase noise estimated value at current time carries out delay disposal and estimates as the phase noise of previous moment
Value.
Fig. 3 is CO-FBMC/OQAM system schematic provided by the invention, from figure 3, it can be seen that CO-FBMC/OQAM system
System originator includes symbol mapping block, disappears and disturb pilot module and frequency-time domain conversion module, and receiving end includes area of light-frequency domain conversion
Module, Kalman filtering compensating module and symbol de-maps module, system originator are connected by IQ modulation module with receiving end, will be sent out
The time-domain signal at end is converted to area of light signal and is transmitted to receiving end；
Preferably, the symbol mapping block is used to receive the bit data by serioparallel exchange, and output signal is by multiple
It is several to turn real number, real-valued signal is passed to disappear and disturbs pilot module；
Described disappear disturbs pilot module for receiving the real-valued signal of symbol mapping block transmitting, and it is inherently dry that pilot tone is eliminated in output
The frequency-region signal disturbed, while for the phase information in recorded pilot signal, to obtain influence of the phase noise to system；
The frequency-time domain conversion module is used to receive the frequency-region signal of pilot module transmitting, output time-domain signal；
The IQ modulation module exports area of light signal for receiving time-domain signal；
The area of light-frequency domain conversion module exports frequency-region signal for receiving area of light signal；
The Kalman filtering compensating module disturbs the solid noisy state that module eliminates frequency pilot sign based on described disappearing,
For calculating the phase noise value on pilot frequency symbol position, so that the compensation of phase noise is carried out, after final output phase compensation
Frequency-region signal；
The symbol de-maps module is used to receive frequency-region signal of the frequency-region signal after real number turns plural number, exports bit number
According to.
Preferably, disappear disturb pilot module structure as shown in Figure 1, it is described disappear disturb pilot module include the first pilot cell and
Second pilot cell；
Preferably, first pilot cell and the second pilot cell include 3 column subcarriers, are located at middle column subcarrier
Frequency pilot sign it is alternate with zero setting symbol, the frequency pilot sign of first pilot cell and the second pilot cell is individually positioned in pair
Odd positions and the even number position of subcarrier are answered, remaining two equal zero setting of column subcarrier；
It is described disappear disturb pilot module can effectively remove at pilot frequency locations intrinsic imaginary part interference, guarantee pilot tone on value not
By admittedly noisy influence and guarantee that each CO-FBMC/OQAM symbol has a frequency pilot sign face recorded thereon
The phase noise of superposition.
More specifically working principle is as follows:
Consider that there are the receiving end demodulated signals of the CO-FBMC/OQAM system of phase noise and ASE noise can be written as:
Wherein, m0Indicate m0A subcarrier, l0For l0A FBMC/OQAM symbol, Lg=KM is filter length, and K is
Overlap factor, M are total subcarrier number, and g (n) represents the time domain response function of filter, gm,lRepresent the time-frequency of the filter
Offset,For ASE noise,Represent Pauli multiphase modulation factor；
It enablesIt is superimposed upon for what system carried
Intrinsic interference, then above formula can simplify are as follows:
By above formula it can be found that intrinsic interference can be superimposed upon and receive on symbol, the normal judgement of phase noise value is influenced, and
The intrinsic interference is the value for being worth size strong correlation with signal itself, and size can not determine, it is necessary to eliminate.
Table 1 is to transmit pilot tone in CO-FBMC/OQAM systemWhen transceiver impulse response, as shown in Table 1,
The intrinsic interference of pilot frequency locations mostlys come from the symbol on subcarrier locating for the pilot tone with the pilot interval for odd positions, with
And the symbol on the adjacent two column subcarriers of the pilot tone.Therefore of the invention disappearing disturbs pilot module and interferes big position to set in imaginary part
Zero operation can greatly eliminate the influence of imaginary part interference.
Table 1
| n-4 | n-3 | n-2 | n-1 | n | n+1 | n+2 | n+3 | n+4 | |
| m-1 | 0.0054 | 0.0429j | -0.1250 | -0.2058j | 0.2393 | 0.2058j | -0.1250 | -0.0429j | 0.0054 |
| m | 0 | -0.0668 | 0.0002j | 0.5644 | 1 | 0.5644 | 0.0002j | -0.0668 | 0 |
| m+1 | 0.0054 | -0.0429j | -0.1250 | 0.2058j | 0.2393 | -0.2058j | -0.1250 | 0.0429j | 0.0054 |
According to table 1 and using the Special Pilot-aided structure of design, formula (3) can simplify are as follows:
Preferably, the structure of the Kalman filtering compensating module is as shown in Figure 2, comprising: pilot extraction unit 1, subtraction
Device 2, the first multiplier 3, adder 4, delay cell 5, the second multiplier 6 are conjugated processing unit 7, third multiplier 8.
1 input terminal of pilot extraction unit connects area of light-frequency domain conversion module input terminal, and output end connects subtracter
2；
The output end of 2 input terminal of the subtracter connection pilot extraction unit 1 and the output end of multiplier 6, output end connect
Connect the input terminal of multiplier 3；
The output end of first multiplier, the 3 input terminal connection subtracter 2, receives fixed kalman gain；Output end connects
Connect the input terminal of adder 4；
The input terminal of the adder 4 connects the output end of the first multiplier 3 and the output end of delay cell 5, output end
The input terminal of connection delay unit 5 and the input terminal of conjugation processing unit 7；
The output end of 5 input terminal of the delay cell connection adder 4, output end connect the input terminal of adder 4 and multiply
The input terminal of musical instruments used in a Buddhist or Taoist mass 6；
The output end of second multiplier, the 6 input terminal connection delay unit 5；
The output end of conjugation 7 input terminal of the processing unit connection adder 4, output end connect the defeated of third multiplier 8
Enter end；
The output end of the input terminal connection conjugation processing unit 7 of the third multiplier 8, output end connect real complex conversion
Module；
Preferably, the pilot extraction unit 1 is for extracting the pilot signal in receiving end frequency-region signal, i.e., complete
At:Wherein, znIndicate n-th of CO-FBMC/OQAM symbol,It indicates to correspond in n-th of FBMC/OQAM symbol
The value of symbol of pilot frequency locations p.
The subtracter 2 is used for the frequency pilot sign for being an actually-received receiving endWith the receipts predicted in Kalman filtering algorithm
Hold pilot symbol valueIt compares, obtains predictive error signal en, it may be assumed that
Unpredictable information is contained in the error signal, therefore error signal is also known as new breath.The new breath is main
For correcting the predicted value of phase noise；
First multiplier 3 is used for the new breath e that will be inputtednWith kalman gain knIt is multiplied, it may be assumed that with suitable coefficient kn
To the new predicted value for ceasing and being weighted to obtain measurement process and being obtained to prediction processCorrection value knen；,
Preferably；
Wherein,knFor kalman gain；R is measurement process covariance, can pass through training in early period
Sequence obtains, and is a fixed value, knCalculated value can be obtained according to the minimum mean square error criterion that newly ceases, it may be assumed that
The adder 4 is used for correction value knenWith predicted valueIt is added, obtains to phase noise based on Kalman
The optimal estimation value of filtering algorithm:
The delay cell 5 is used for will be based on the optimal estimation value of Kalman filtering algorithmCarry out prolonging for moment
When, it obtainsAccording to predictive equation (4):Known to
Last moment is finally obtained to the predicted value of the phase noise at the moment
Second multiplier 6 is used for known originator pilot signalWith predicted valueMultiplication obtains receiving end and leads
The predicted value of frequency signal
The conjugation processing unit 7 is used to take the phase noise of input the operation of conjugation:Wherein, j represents void
Number；
The third multiplier 8 is used for the phase noise that will be inputtedConjugation be multiplied with the frequency-region signal of FBMC/OQAM
Result after obtaining phase noise compensation:
To sum up, the algorithm process method of Kalman filtering compensating module is as follows:
Predictive equation needed for initially setting up Kalman filtering algorithm and measurement equation:
The frequency pilot sign in receiving end symbol is extracted firstOriginator frequency pilot sign corresponding with itsThen phase is initialized
Position noisePredicting covariance P (0)=0.
To each FBMC/OQAM symbol, its prediction process and measurement process are successively calculated:
The equation of the prediction process are as follows:
Wherein, Q=2 π Δ vT is prediction process covariance；Δ v is joint laser linewidth；T=Ts/ M is normalized
FBMC/OQAM symbol period；
The equation of the measurement process are as follows:
It can obtain corresponding to each by above-mentioned iterationPhase noise, according toObtain by
Signal after phase compensation.
It is illustrated in figure 4 a kind of specific CO-FBMC/OQAM system provided by the embodiment, the CO- in the present embodiment
Total sub-carrier number of FBMC/OQAM system is 256, and effective sub-carrier number is 250, character rate 20GS/s, 16QAM modulation and
Carry pilot signal.
The originator working mechanism of CO-FBMC/OQAM system is as follows:
The binary information bit of input passes through the processing that serioparallel exchange, 16QAM mapping and plural number arrive real number first, completes
The pretreatment of OQAM forms the parallel PAM data symbol of 250 column, then sets at the both ends of the parallel data symbols plus the present invention
The noise reduction pilot configuration D1 unit and D2 unit of meter, D1 unit and D2 unit mixing 250 arrange parallel one similar shape of PAM data symbol
At the parallel data structure of 256 column, next pre-processes, enter using the orthogonalization that Pauli multiphase modulation module carries out system
Each column of the 256 column parallel data are loaded by IFFT conversion and the modulation of synthesis filter group in synthesis filter group module
On the different subcarrier of 256 column and frequency domain to time domain conversion is completed, is formed finally by parallel-serial conversion and plus training sequence
Next FBMC/OQAM baseband signal realizes that formation can be transmitted in a fiber by electrical domain-area of light up-conversion through IQ modulation
Signal；
The receiving end working mechanism of CO-FBMC/OQAM system is as follows:
The originator FBMC/OQAM signal for being modulated at area of light passes through the baseband signal obtained after coherent detection balance reception first
By Timing Synchronization, obtained frequency-region signal after analysis filter group and channel estimation, is sent into filtering compensation mould by serioparallel exchange
Block.The frequency pilot sign of receiving end is extracted by extracting pilot cell 1 in this module, then is extracted before delayed unit 5 handles
The receiving end frequency pilot sign predicted value that one moment phase noise estimated value is multiplied with originator frequency pilot sign, then by receiving end
Test frequency pilot sign and receiving end frequency pilot sign predicted value subtract each other to obtain in subtracter 2 letter of the error between measured value and predicted value
Number, multiplier 3 receives the error amount and is multiplied to obtain measurement process with kalman gain to the correction value of prediction process, obtains
Correction value be added to obtain the phase noise obtained by Kalman Algorithm in adder 4 with the phase noise value at a upper moment
Estimated value, using the conjugation processing of processing unit 7 finally obtain phase noise compensation value be multiplied with the symbol of receiving end to obtain by
The signal of phase compensation exports.The phase noise compensation signal of output using take it is real answer converting unit, parallel serial conversion unit and
The bit signal output being restored after 16QAM constellation demapping.
The present embodiment is respectively to the processed signal of CO-FBMC/OQAM system provided through this programme and by based on blind
The processed signal of Kalman's phase noise compensation device of judgement carries out performance simulation, and Fig. 5 is two kinds of distinct methods in difference
Laser linewidth under system BER performance comparison figure, wherein P-EKF be CO-FBMC/OQAM system proposed by the present invention, if
Setting total subcarrier number is 256, effective subcarrier number 250, wherein 6 subcarriers close to direct current biasing are used to place this
The pilot configuration that scheme proposes, and B-EKF is for the Kalman filtering algorithm structure based on blind judgement for performance comparison
System, total subcarrier number are 256, effective subcarrier number 256, compared two schemes in figure respectively and are transmitting back-to-back
Under the conditions of and by 400km optical fiber transmission after performance comparison.As seen from the figure, under two conditions, the phase of this programme
Noise tolerance improves 1000kHz or so compared with the scheme based on blind judgement, greatly demonstrates the superiority of this programme.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of modulator approach of CO-FBMC/OQAM characterized by comprising
(1) PAM data symbol is converted by the bit signal of input；
(2) the intrinsic imaginary part interference of pilot tone is eliminated at the both ends of PAM data symbol, and records pilot symbol phases information；
(3) it receives by pilot cell treated frequency-region signal, to being modulated after the pretreatment of its orthogonalization, completes frequency domain letter
Number arrive time-domain signal conversion；
(4) time-domain signal obtained, which carries out IQ modulation after parallel-serial conversion and training sequence processing, is transmitted to area of light signal to be
System receiving end；
(5) received area of light signal is converted into frequency-region signal and carries out Kalman filtering phase noise compensation；
(6) output signal of phase compensation is restored into bit signal after demapping.
2. modulator approach as described in claim 1, which is characterized in that the specific steps in step (2) are as follows:
(2.1) PAM data symbol one end access three column subcarriers, middle column subcarrier odd bits place frequency pilot sign,
Even bit places zero setting symbol and remaining two equal zero setting of column subcarrier, completes the access of the first pilot cell and PAM data symbol；
(2.2) three column subcarriers are accessed in the PAM data symbol other end, places pilot tone symbol in the even bit of middle column subcarrier
Number, odd bits place zero setting symbol and remaining two equal zero setting of column subcarrier, complete connecing for the second pilot cell and PAM data symbol
Enter；
(2.3) first pilot cells and the second pilot cell receive PAM data symbol, eliminate the intrinsic imaginary part interference of system, and remember
Record the phase information of pilot frequency locations.
3. modulator approach as claimed in claim 2, which is characterized in that the specific steps in step (5) are as follows:
(5.1) received area of light signal is by obtaining baseband signal after coherent detection balance reception；
(5.2) baseband signal is obtained into frequency-region signal by demodulation after Timing Synchronization and serioparallel exchange；
(5.3) predicted value of test pilot signal and receiving end pilot signal in frequency-region signal is subtracted each other into acquisition error signal；
(5.4) received error signal is multiplied with kalman gain, and combines the phase noise estimated value of last moment, is worked as
The estimated value of preceding moment phase noise；
(5.5) phase noise compensation signal is obtained according to the estimated value of phase noise and frequency pilot sign.
4. modulator approach as claimed in claim 3, which is characterized in that specific step is as follows for the step (5.3):
(5.3.1) extracts the test pilot signal of the receiving end of pilot frequency locations；
The known pilot signal of originator is multiplied by (5.3.2) with the phase noise estimated value of last moment obtains originator pilot tone letter
The predicted value of number corresponding receiving end pilot signal；
The predicted value of the test pilot signal of receiving end and pilot signal is subtracted each other to obtain error signal between the two by (5.3.3).
5. modulator approach as claimed in claim 4, which is characterized in that specific step is as follows for the step (5.4):
(5.4.1) described error signal is multiplied to obtain the correction value of phase noise with fixed kalman gain；
(5.4.2) the described obtained value that is multiplied is added the phase as current time in the phase noise estimated value with last moment
Noise estimation value.
6. modulator approach as claimed in claim 5, which is characterized in that specific step is as follows for the step (5.5):
(5.5.1) handles the conjugation that the phase noise estimated value at current time carries out phase noise；
(5.5.2) conjugate of phase noise is multiplied with the frequency pilot sign of receiving end obtain phase noise compensation after estimated value,
And as the signal of phase noise compensation；
The phase noise estimated value at (5.5.3) current time carries out phase noise estimated value of the delay disposal as previous moment.
7. a kind of CO-FBMC/OQAM system, which is characterized in that including symbol mapping block, disappear and disturb pilot module, frequency-time domain
Conversion module, IQ modulation module, area of light-frequency domain conversion module, Kalman filtering compensating module and symbol de-maps module；
The symbol mapping block is used to receive the bit data by serioparallel exchange, and output signal turns real number by plural number, will
Real-valued signal, which passes to disappear, disturbs pilot module；
Described disappear disturbs the real-valued signal that pilot module receives the transmitting of symbol mapping block, and output eliminates pilot tone and consolidates noisy frequency domain
Signal for eliminating the intrinsic imaginary part interference at pilot frequency locations, while for the phase information in recorded pilot signal, and then obtains
Take influence of the phase noise to system；
The frequency-time domain conversion module, which is used to receive to disappear, disturbs the frequency-region signal of pilot module transmitting, output time-domain signal；
The IQ modulation module exports area of light signal for receiving time-domain signal；
The area of light-frequency domain conversion module is for receiving the area of light signal that time-domain signal is converted through I/Q modulator, output frequency domain letter
Number；
The Kalman filtering compensating module be based on it is described disappear to disturb module and eliminate frequency pilot sign consolidate noisy state, for calculating
Phase noise value on pilot frequency symbol position, so that the compensation of phase noise is carried out, the frequency domain letter after final output phase compensation
Number；
The symbol de-maps module is used to receive frequency-region signal of the frequency-region signal after real number turns plural number, exports bit data.
8. CO-FBMC/OQAM system as claimed in claim 7, which is characterized in that described to disappear that disturb pilot module include first leading
Frequency unit and the second pilot cell；
First pilot cell and the second pilot cell include 3 column subcarriers, positioned at the frequency pilot sign of middle column subcarrier
It is alternate with zero setting symbol, remaining two equal zero setting of column subcarrier, the frequency pilot sign of first pilot cell and the second pilot cell
It is individually positioned in odd positions and the even number position of corresponding subcarrier.
9. CO-FBMC/OQAM system as claimed in claim 8, which is characterized in that the Kalman filtering compensating module packet
It includes: pilot extraction unit (1), subtracter (2), the first multiplier (3), adder (4), delay cell (5), the second multiplier
(6), processing unit (7) are conjugated, third multiplier (8).
Pilot extraction unit (1) input terminal connects area of light-frequency domain conversion module output end, and output end connects subtracter
(2)；
The output end of subtracter (2) input terminal connection pilot extraction unit (1) and the output end of multiplier (6), output end
Connect the input terminal of the first multiplier (3)；
The output end of first multiplier (3) input terminal connection subtracter (2), output end connect the input terminal of adder (4)；
The output end of the input terminal connection the first multiplier (3) of the adder (4) and the output end of delay cell (5), output
Hold the input terminal of connection delay unit (5) and the input terminal of conjugation processing unit (7)；
The output end of delay cell (5) input terminal connection adder (4), output end connect adder (4) input terminal and
The input terminal of second multiplier (6)；
The output end of second multiplier (6) the input terminal connection delay unit (5)；
The output end of conjugation processing unit (7) input terminal connection adder (4), output end connect third multiplier (8)
Input terminal；
The output end of input terminal connection conjugation processing unit (7) of the third multiplier (8), output end connect real complex conversion
Module；
The pilot extraction unit (1) is for extracting pilot signal in receiving end pilot tone；
The subtracter (2) is used to that the pilot signal of the pilot signal of receiving end and prediction to be subtracted each other to obtain the letter of error between the two
Number；
First multiplier (3) is used for error signal and fixed Kalman's multiplied by gains；
The adder (4) obtains for the result that multiplier (3) obtains to be added with the phase noise estimated value of previous moment
The phase noise estimated value at current time；
The phase noise that the delay cell (5) is used to convert the phase noise estimated value at current time to previous moment is estimated
Value；
Second multiplier (6) is multiplied for the pilot signal that will start with previous moment phase noise estimated value, obtains pre-
The corresponding reception pilot value of the frequency pilot sign of survey；
Conjugation processing unit (7) is used to obtain the conjugate of the phase noise at current time；
The third multiplier (8) is for the conjugate of the phase noise at current time to be multiplied to obtain with the frequency pilot sign of receiving end
Estimated value after phase noise compensation.
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