CN108199778A - A kind of CO-OFDM system phase noise compensation method and system based on RF pilot tones - Google Patents
A kind of CO-OFDM system phase noise compensation method and system based on RF pilot tones Download PDFInfo
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- CN108199778A CN108199778A CN201810094702.9A CN201810094702A CN108199778A CN 108199778 A CN108199778 A CN 108199778A CN 201810094702 A CN201810094702 A CN 201810094702A CN 108199778 A CN108199778 A CN 108199778A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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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
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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
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
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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
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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Abstract
The invention discloses a kind of CO ofdm system phase noise compensation method and systems based on RF pilot tones, belong to optoelectronic communication technical field.Present system includes coarse compensation module and smart compensating module；Wherein receiving end extracts radio frequency pilot tone after coherent demodulation and analog-to-digital conversion with wave digital lowpass filter, and pilot tone and originator with signal multiplication realize thick phase compensation after comparing and being conjugated；Signal through coarse compensation does constellation by FFT transform to frequency domain and adjudicates in advance；Anticipation result does time domain subregion simultaneously with coarse compensation result；To prejudge result as reference, fine pahse correction is carried out to the coarse compensation result of each subregion.The invention also achieves a kind of CO ofdm system phase noise compensation methods based on RF pilot tones.The present invention has better ICI compensation performances relative to the existing phase noise compensation scheme based on subcarrier pilot tone, and the fine compensation based on pre- judgement and subregion correction further improves the ability of RF pilot tones confrontation nonlinear phase shift.
Description
Technical field
The invention belongs to optoelectronic communication technical field, more particularly, to a kind of CO-OFDM systems based on RF pilot tones
Phase noise compensation method.
Background technology
Subcarrier in optic communication CO-OFDM systems easily caused by the interference of phase correlated noise the rotation of receiving end planisphere with
Diverging.Phase noise is essentially from laser linewidth and link non-linear, due to CO-OFDM systems longer symbol lengths and height
Peak-to-average power ratio cause its transmission performance be more susceptible to phase noise deterioration.How efficiently to monitor and compensate phase noise is
One critical issue of CO-OFDM systems.
The existing scheme based on subcarrier pilot tone obtains the distortion of constellation symbol by the subcarrier that frequency domain loads, but only
The average phase-shift error (CPE) in the entire OFDM symbol period can be estimated, to fast-changing inter-carrier interference (ICI) at any time
Noise is helpless；And the scheme based on RF pilot tones obtains instantaneous phase distortion by the extraction synchronous with sampling of radio frequency pilot tone
Information, but its spectrum efficiency is not high, and device expense is big, and the compensation performance under comprehensive condition is often limited.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of CO-OFDM based on RF pilot tones
System phase noise compensation method and system, it is intended that receiving end is filtered after coherent demodulation and analog-to-digital conversion with digital lowpass
Wave device extracts radio frequency pilot tone, and pilot tone and originator with signal multiplication realize thick phase compensation after comparing and being conjugated；Letter through coarse compensation
Number constellation is done by FFT transform to frequency domain and adjudicated in advance；Anticipation result does time domain subregion simultaneously with coarse compensation result；To prejudge result
For reference, fine pahse correction is carried out to the coarse compensation result of each subregion, it is non-thread thus to further improve the confrontation of RF pilot tones
The ability of property phase shift.
To achieve the above object, the present invention provides a kind of CO-OFDM system phase noise compensation sides based on RF pilot tones
Method, the method includes：
(1) by the OFDM time-domain signals x comprising RF pilot tonesm,nDigital low-pass filtering is carried out, obtains pilot tone time-domain signal
Wherein, hlDiscrete impulse response for wave digital lowpass filter；L is the respective point sum of wave digital lowpass filter；
M, n represent the sampled point serial number in the symbol serial number and single symbol of OFDM time-domain signals respectively；
(2) by pilot tone time-domain signalWith originator pilot tone time-domain signal pm,nIt is compared, obtains estimating phase noise
It is right againTake conjugation, and and xm,nMultiplication obtains coarse compensation result
Wherein, j represents imaginary number；
(3) it is rightFFT transform is carried out, obtains frequency domain constellation symbol
Wherein, k represents subcarrier serial number, and N represents single ofdm signal symbol sampler points；
(4) it is rightIt carries out obtaining time domain reference signal through IFFT inverse transformations after adjudicating in advancePre- judgement using constellation away from
From nearest principle,
Wherein, dec () represents pre- judgement；
(5) respectively to the coarse compensation result of m-th of symbolWith the time domain reference signal of m-th of symbolIt is suitable by sampling
Sequence carries out subregion：
Wherein, NSRepresent the quantity of subregion；
WithQ-th of subregion expansion be specially：
Wherein, S represents the quantity of sampled point in subregion, S=[N/NS], [] represents downward rounding；
(6) withFor reference, estimated based on least square principleSegmented phase error
Wherein,*Represent conjugate transposition；-Represent complex conjugate；
Recycle segmented phase errorPhase correction is done to subregion, finally obtains the OFDM time-domain signals after essence compensation
It is another aspect of this invention to provide that the present invention provides a kind of CO-OFDM system phase noises based on RF pilot tones
Compensation system, the system comprises coarse compensation modules and smart compensating module：
The coarse compensation module includes：
Low-pass filter unit, for the OFDM time-domain signals x of RF pilot tones will to be includedm,nDigital low-pass filtering is carried out, is led
Frequency time-domain signal
Wherein, hlDiscrete impulse response for wave digital lowpass filter；L is the respective point sum of wave digital lowpass filter；
M, n represent the sampled point serial number in the symbol serial number and single symbol of OFDM time-domain signals respectively；
Pilot tone compares conjugate unit, for by pilot tone time-domain signalWith originator pilot tone time-domain signal pm,nIt is compared,
It obtains estimating phase noise Again to phase noiseTake conjugation；
Multiplier, for by the phase noise inputtedConjugation and OFDM time-domain signals xm,nMultiplication obtains coarse compensation knot
Fruit Wherein, j represents imaginary number；
The essence compensating module includes：
FFT unit, for pairFFT transform is carried out, obtains frequency domain constellation symbol
Wherein, k represents subcarrier serial number, and N represents single ofdm signal symbol sampler points；
Pre- decision unit, for pairIt is adjudicated in advance；The pre- decision unit specifically uses the closest original of constellation
Then adjudicated in advance；
IFFT units, after to adjudicating in advanceIt carries out IFFT inverse transformations and obtains time domain reference signal Wherein, dec () represents pre- judgement；
Time domain zoning unit, for respectively to the coarse compensation result of m-th of symbolWith the time domain reference of m-th of symbol
SignalSubregion is carried out by sampling order
Wherein, NSRepresent the quantity of subregion；
WithQ-th of subregion is unfolded：
Wherein, S represents the quantity of sampled point in subregion, S=[N/NS], [] represents downward rounding；
Phase correction block, forFor reference, estimated based on least square principleSegmented phase error
Wherein,*Represent conjugate transposition；-Represent complex conjugate；
Recycle segmented phase errorPhase correction is done to each subregion and obtains the OFDM time-domain signals after essence compensationSpecially：
In general, by the above technical scheme conceived by the present invention compared with prior art, there is following technology spy
Sign and advantageous effect：
(1) present invention uses cascade second order compensation structure, is combined, compared by RF coarse compensations and segmented phase correction
Existing RF pilot tones compensation scheme has reached outstanding compensation performance, while low requirement on devices also increases with relatively low expense
The versatility of compensation；
(2) two benches compensation of the present invention is all the compensating operation performed in time domain, each sampled point can be recorded instantaneously
Phase distortion, there is no modeling errors, more efficient to intercarrier interference noise compensation compared to subcarrier pilot tone；
(3) further phase deflection caused by link non-linear is estimated using segmented phase correction in the present invention
Meter, compared to the existing scheme purely compensated for laser phase noise, the program can also be alleviated is drawn by link non-linear
The phase distortion entered improves the tolerance that signal damages gross phase.
Description of the drawings
Fig. 1 is the structure diagram of present system embodiment；
Fig. 2 is in receiver present position the present embodiments relate to structure
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Conflict is not formed between this to can be combined with each other.
Present system example structure is as shown in Figure 1, including coarse compensation module and smart compensating module.Wherein coarse compensation mould
Block includes time-domain sampling and inputs 1, and wave digital lowpass filter 2, pilot tone compares conjugate unit 3, multiplier 4, the output of coarse compensation result
5；Smart compensating module includes FFT transform 6, pre- decision unit 7, IFFT inverse transformations 8, time domain zoning unit 9, phase correction unit
10。
Its connection structure is as follows：
Coarse compensation module：First end of time-domain sampling input 1 is connected to multiplier 4 as its first input, time domain
Second end of sampling input 1 is connected to wave digital lowpass filter 2, and the result of wave digital lowpass filter 2 is sent to pilot tone comparison
Conjugate unit 3, second input of the result as multiplier 4, makees coarse compensation result output 5 after multiplication；
Smart compensating module：Coarse compensation result output 5 is inputted as the module, and first via signal passes sequentially through FFT transform 6,
Pre- decision unit 7 is sent to time domain zoning unit 9 after IFFT inverse transformations 8；The another way of coarse compensation result output 5 directly transmits
To time domain zoning unit 9；Two groups of outputs of time domain zoning unit 9 obtain fine compensation result after phase correction unit 10.
In embodiments of the present invention, during work, in coarse compensation module, the time-domain sampling input 1 for carrying radio frequency pilot tone passes through
The extraction of wave digital lowpass filter 2 obtains pilot signal, and the conjugation of the acquisition phase noise of conjugate unit 3 is compared using pilot tone.Altogether
Yoke result obtains the output 5 of coarse compensation result after being multiplied in multiplier 4 with time-domain sampling input 1.
It inputting in coarse compensation result output 5 as smart compensating module, signal is transmitted directly to time domain zoning unit 9 all the way,
Another way signal performs pre- decision operation through FFT transform 6 to frequency domain constellation and the pre- decision unit 7 of process and obtains frequency domain reference letter
Number.By this reference signal by being sent to time domain zoning unit 9 after IFFT inverse transformations 8 to time domain.Through 9 subregion of time domain zoning unit
Reference signal and coarse compensation signal be sent into phase correction unit 10 together and carry out subregion correction, finally export through finely compensating
Time-domain signal.
Below in conjunction with the accompanying drawings and specific example the present invention is further described.It herein will be effectively sub with total sub-carrier number 128
Carrier number 100, character rate 10GS/s, 16QAM modulation, data rate 29Gb/s and the CO-OFDM signals for carrying radio frequency pilot tone
It describes in detail to the present invention.
As shown in Fig. 2, flashlight and intrinsic light (sending and receiving end operation wavelength is all 1552.5nm, line width 500MHz) are sent first
Enter optical coherent detection device and be demodulated to IQ two-way baseband signals.For baseband signal, coarse compensation module, i.e. Fig. 2 are sent into after sampled
In RF pilot tones just compensate.Need to IQ two-way real signals first be merged into complex signal all the way in this element and obtain Fig. 1 coarse compensation moulds
Time-domain sampling input 1 in the block.Later, it extracts to obtain pilot signal by the wave digital lowpass filter of 40MHz bandwidth, through conjugation
Be multiplied acquisition just compensation result with former complex signal in multiplier 4 afterwards.Hereafter, signal first synchronizes, removes cyclic prefix, string
And convert, channel equalization, linear phase estimation, frequency deviation correction etc. operations, result as essence compensating module input, i.e. Fig. 2
In essence compensation.In this element, input signal is divided into two-way, is transmitted directly to time domain zoning unit 9, another way signal warp all the way
128 points of FFT transform 6 to frequency domain constellation and the pre- decision unit 7 of process performs pre- decision operation and obtains frequency domain reference signal, prejudges
Certainly use closest principle.Hereafter, by reference signal by being sent to time domain subregion after 128 point IFFT inverse transformations 8 to time domains
Unit 9, should be in strict accordance with signal-subcarrier principle of correspondence of originator in IFFT inverse transformations, and zero padding is unified in remaining position.
In time domain subregion 9, it is 4 to take partition length S here, i.e., 32 subregions carry out division operation.Hereafter, in phase correction unit 10
In the correction phase of each subregion be calculated and correct one by one.Finally, it is mapped, after parallel-serial conversion by FFT, QAM in Fig. 2
The serial type bit sequence that can be exported.
More than content 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,
It is not intended to limit the invention, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc.,
It should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of CO-OFDM system phase noise compensation methods based on RF pilot tones, which is characterized in that the method is specifically wrapped
It includes：
(1) by the OFDM time-domain signals x comprising RF pilot tonesm,nDigital low-pass filtering is carried out, obtains pilot tone time-domain signalM, n
The sampled point serial number in the symbol serial number and single symbol of OFDM time-domain signals is represented respectively；
(2) by pilot tone time-domain signalWith originator pilot tone time-domain signal pm,nIt is compared, obtains estimating phase noiseAgain
ByObtain coarse compensation result
(3) it is rightFFT transform is carried out, obtains frequency domain constellation symbolWherein, k represents subcarrier serial number；
(4) it is rightIt carries out obtaining time domain reference signal through IFFT inverse transformations after adjudicating in advance
(5) respectively to the coarse compensation result of m-th of symbolWith the time domain reference signal of m-th of symbolIt is carried out by sampling order
Subregion is simultaneously unfolded, and q-th of subregion is respectivelyWith
(6) withFor reference, estimationSegmented phase errorIt recyclesPhase is done to each subregion
Correction finally obtains the OFDM time-domain signals after essence compensation
2. a kind of CO-OFDM system phase noise compensation methods based on RF pilot tones according to claim 1, feature exist
In, in the step (2) byObtain coarse compensation resultSpecially：It is rightTake conjugation, and and xM, nMultiplication is slightly mended
Repay result
Wherein, j represents imaginary number.
3. a kind of CO-OFDM system phase noise compensation methods based on RF pilot tones according to claim 1, feature exist
In the step (4) is middle to be adjudicated in advance using the closest principle of constellation.
4. a kind of CO-OFDM system phase noise compensation methods based on RF pilot tones according to claim 1, feature exist
In in the step (5), respectively to the coarse compensation result of m-th of symbolWith the time domain reference signal of m-th of symbolBy adopting
Sample sequence carries out subregion, specially：
Wherein, NSRepresent the quantity of subregion；
WithQ-th of subregion is unfolded：
Wherein, S represents the quantity of sampled point in subregion, S=[N/NS], N represents single ofdm signal symbol sampler points, [] table
Show downward rounding.
5. a kind of CO-OFDM system phase noise compensation methods based on RF pilot tones according to claim 1 or 4, special
Sign is, in the step (6) withFor reference, estimated based on least square principleSegmented phase errorSpecially：
Wherein,*Represent conjugate transposition；-Represent complex conjugate；
Utilize segmented phase errorPhase correction is done to each subregion and obtains the OFDM time-domain signals after essence compensationSpecifically
For：
6. a kind of CO-OFDM system phase noise compensation systems based on RF pilot tones, which is characterized in that the system specifically includes
Coarse compensation module and smart compensating module：
The coarse compensation module includes：
Low-pass filter unit, for the OFDM time-domain signals x of RF pilot tones will to be includedm,nDigital low-pass filtering is carried out, when obtaining pilot tone
Domain signalM, n represent the sampled point serial number in the symbol serial number and single symbol of OFDM time-domain signals respectively；
Pilot tone compares conjugate unit, for by pilot tone time-domain signalWith originator pilot tone time-domain signal pm,nIt is compared, is obtained
Estimate phase noiseAgain to phase noiseTake conjugation；
Multiplier, for by the phase noise inputtedConjugation and OFDM time-domain signals xm,nMultiplication obtains coarse compensation result
The essence compensating module includes：
FFT unit, for pairFFT transform is carried out, obtains frequency domain constellation symbolWherein, k represents subcarrier serial number；
Pre- decision unit, for pairIt is adjudicated in advance；
IFFT units, after to adjudicating in advanceIt carries out IFFT inverse transformations and obtains time domain reference signal
Time domain zoning unit, for respectively to the coarse compensation result of m-th of symbolWith the time domain reference signal of m-th of symbol
Subregion is carried out by sampling order and is unfolded, and q-th of subregion is respectivelyWith
Phase correction block, forFor reference, estimationSegmented phase errorIt recyclesIt is right
Each subregion does phase correction, finally obtains the OFDM time-domain signals after essence compensation
7. a kind of CO-OFDM system phase noise compensation systems based on RF pilot tones according to claim 6, feature exist
In the pre- decision unit is specifically adjudicated in advance using the closest principle of constellation.
8. a kind of CO-OFDM system phase noise compensation systems based on RF pilot tones according to claim 6, feature exist
In respectively to the coarse compensation result of m-th of symbol in the time domain zoning unitWith the time domain reference signal of m-th of symbol
Subregion is carried out by sampling order, specially：
Wherein, NSRepresent the quantity of subregion；
WithQ-th of subregion is unfolded：
Wherein, S represents the quantity of sampled point in subregion, S=[N/NS], N represents single ofdm signal symbol sampler points, [] table
Show downward rounding.
9. a kind of CO-OFDM system phase noise compensation systems based on RF pilot tones according to claim 6 or 8, special
Sign is, in the phase correction block withFor reference, estimated based on least square principleSegmented phase miss
DifferenceSpecially：
Wherein,*Represent conjugate transposition；-Represent complex conjugate；
Utilize segmented phase errorPhase correction is done to each subregion and obtains the OFDM time-domain signals after essence compensationSpecifically
For：
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| CN109274433A (en) * | 2018-10-31 | 2019-01-25 | 重庆邮电大学 | A kind of fusion zero forcing algorithm and the novel phase noise compensation scheme from elimination algorithm in CO-OFDM system |
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| CN109600332A (en) * | 2018-11-22 | 2019-04-09 | 华中科技大学 | A kind of modulator approach and system of CO-FBMC/OQAM |
| CN110011734A (en) * | 2019-04-18 | 2019-07-12 | 杭州电子科技大学 | CPE compensation method in CO-OFDM system based on pilot tone and two-dimensional projection's histogram |
| CN110971307A (en) * | 2019-11-08 | 2020-04-07 | 华中科技大学 | Method for compensating interference between subcarriers inherent to SEFDM system |
| CN111082873A (en) * | 2019-12-17 | 2020-04-28 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
| CN113132284A (en) * | 2020-01-16 | 2021-07-16 | 大唐移动通信设备有限公司 | Carrier phase tracking method and device |
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| CN115102629A (en) * | 2022-06-30 | 2022-09-23 | 东风汽车集团股份有限公司 | Method and device for phase estimation and compensation |
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| CN109547387B (en) * | 2018-09-11 | 2020-07-10 | 华中科技大学 | Method and system for suppressing nonlinear effect of CO-OFDM (CO-orthogonal frequency division multiplexing) system |
| CN109547387A (en) * | 2018-09-11 | 2019-03-29 | 华中科技大学 | A kind of CO-OFDM mission nonlinear effect suppressing method and system |
| CN109274433A (en) * | 2018-10-31 | 2019-01-25 | 重庆邮电大学 | A kind of fusion zero forcing algorithm and the novel phase noise compensation scheme from elimination algorithm in CO-OFDM system |
| CN109600332A (en) * | 2018-11-22 | 2019-04-09 | 华中科技大学 | A kind of modulator approach and system of CO-FBMC/OQAM |
| CN110011734A (en) * | 2019-04-18 | 2019-07-12 | 杭州电子科技大学 | CPE compensation method in CO-OFDM system based on pilot tone and two-dimensional projection's histogram |
| CN114365430A (en) * | 2019-09-18 | 2022-04-15 | 凯迪迪爱通信技术有限公司 | Receiving apparatus and program |
| CN110971307A (en) * | 2019-11-08 | 2020-04-07 | 华中科技大学 | Method for compensating interference between subcarriers inherent to SEFDM system |
| CN110971307B (en) * | 2019-11-08 | 2021-07-27 | 华中科技大学 | Method for compensating interference between subcarriers inherent to SEFDM system |
| CN111082873A (en) * | 2019-12-17 | 2020-04-28 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
| CN111082873B (en) * | 2019-12-17 | 2022-02-11 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
| CN113132284A (en) * | 2020-01-16 | 2021-07-16 | 大唐移动通信设备有限公司 | Carrier phase tracking method and device |
| CN113300779A (en) * | 2021-04-26 | 2021-08-24 | 浙江工业大学 | Pilot-assisted CO-FBMC/OQAM system phase noise compensation method |
| CN113300779B (en) * | 2021-04-26 | 2022-04-08 | 浙江工业大学 | Pilot-assisted CO-FBMC/OQAM system phase noise compensation method |
| CN115102629A (en) * | 2022-06-30 | 2022-09-23 | 东风汽车集团股份有限公司 | Method and device for phase estimation and compensation |
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