CN108199778B - CO-OFDM system phase noise compensation method and system based on RF pilot frequency - Google Patents
CO-OFDM system phase noise compensation method and system based on RF pilot frequency Download PDFInfo
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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
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- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
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- 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
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Abstract
The invention discloses a CO-OFDM system phase noise compensation method and system based on RF pilot frequency, belonging to the technical field of photoelectronic communication. The system comprises a coarse compensation module and a fine compensation module; after coherent demodulation and analog-to-digital conversion, the receiving end extracts radio frequency pilot frequency by using a digital low-pass filter, and the pilot frequency is compared with the transmitting end and is multiplied by a signal after conjugation to realize coarse phase compensation; the coarsely compensated signal is transformed to a frequency domain through FFT to be subjected to constellation pre-judgment; the pre-judging result and the coarse compensation result are subjected to time domain partitioning at the same time; and taking the pre-judgment result as a reference, and performing fine phase correction on the coarse compensation result of each partition. The invention also realizes a CO-OFDM system phase noise compensation method based on the RF pilot frequency. Compared with the existing phase noise compensation scheme based on the subcarrier pilot frequency, the phase noise compensation method based on the subcarrier pilot frequency has better ICI compensation performance, and fine compensation based on pre-decision and partition correction further improves the capability of the RF pilot frequency to resist nonlinear phase shift.
Description
Technical Field
The invention belongs to the technical field of optoelectronic communication, and particularly relates to a CO-OFDM system phase noise compensation method based on RF pilot frequency.
Background
The sub-carriers in the optical communication CO-OFDM system are susceptible to phase-dependent noise interference, so that the rotation and the divergence of the receiving end constellation diagram are caused. Phase noise mainly comes from laser linewidth and link nonlinearity, and the transmission performance of the CO-OFDM system is more susceptible to phase noise degradation due to the longer symbol length and high peak-to-average power ratio. How to efficiently monitor and compensate for phase noise is a key issue for CO-OFDM systems.
The existing scheme based on the subcarrier pilot frequency obtains the distortion of constellation symbols through subcarriers loaded in a frequency domain, but only can estimate the average phase shift error (CPE) in the whole OFDM symbol period, and has no effect on inter-carrier interference (ICI) noise which changes rapidly along with time; the scheme based on the RF pilot frequency extracts instantaneous phase distortion information through synchronization of the radio frequency pilot frequency and sampling, but the frequency spectrum efficiency is not high, the device overhead is large, and the compensation performance under the comprehensive condition is often limited.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a CO-OFDM system phase noise compensation method and system based on RF pilot frequency, and aims to extract the radio frequency pilot frequency by a digital low-pass filter after coherent demodulation and analog-to-digital conversion at a receiving end, and multiply the pilot frequency with a signal after comparing and conjugating the pilot frequency with a transmitting end to realize coarse phase compensation; the coarsely compensated signal is transformed to a frequency domain through FFT to be subjected to constellation pre-judgment; the pre-judging result and the coarse compensation result are subjected to time domain partitioning at the same time; and performing fine phase correction on the coarse compensation result of each partition by taking the pre-judgment result as a reference, thereby further improving the capability of the RF pilot frequency to resist nonlinear phase shift.
In order to achieve the above object, the present invention provides a method for compensating phase noise of a CO-OFDM system based on RF pilot, the method comprising:
(1) OFDM time-domain signal x containing RF pilotsm,nPerforming digital low-pass filtering to obtain pilot frequency time domain signal
Wherein h islIs the discrete impulse response of the digital low-pass filter; l is the total number of corresponding points of the digital low-pass filter; m and n respectively represent the symbol serial number of the OFDM time domain signal and the serial number of a sampling point in a single symbol;
(2) pilot time domain signalAnd an originating pilot time domain signal pm,nComparing to obtain estimated phase noise
Then toTaking conjugation, and with xm,nMultiplying to obtain a coarse compensation result
Wherein j represents an imaginary number;
(3) to pairFFT to obtain frequency domain constellation symbol
Wherein k represents the serial number of a subcarrier, and N represents the number of sampling points of a single OFDM signal symbol;
(4) to pairAfter pre-decision, time domain reference signals are obtained through Inverse Fast Fourier Transform (IFFT)The pre-decision adopts the principle that the constellation distance is nearest,
where dec () represents a pre-decision;
(5) coarse compensation results for the mth symbol respectivelyAnd the time domain reference signal of the m-th symbolPartitioning according to a sampling sequence:
wherein N isSIndicating the number of partitions;
andthe q-th partition expansion specifically comprises:
wherein S represents the number of samples within a partition, and [ N/N ═ SS]，[]Represents rounding down;
(6) to be provided withFor reference, estimation is based on the least squares principleIs divided into zones
Wherein,*represents a conjugate transpose;-represents a complex conjugate;
reusing partitioned phase errorsPhase correction is carried out on the subareas, and finally the OFDM time domain signal after fine compensation is obtained
According to another aspect of the present invention, there is provided a CO-OFDM system phase noise compensation system based on RF pilot, the system comprising a coarse compensation module and a fine compensation module:
the coarse compensation module comprises:
a low-pass filtering unit for filtering the OFDM time domain signal x containing the RF pilotm,nPerforming digital low-pass filtering to obtain pilot frequency time domain signal
Wherein h islIs the discrete impulse response of the digital low-pass filter; l isThe total number of corresponding points of the digital low-pass filter; m and n respectively represent the symbol serial number of the OFDM time domain signal and the serial number of a sampling point in a single symbol;
a pilot frequency comparison conjugation unit for comparing the pilot frequency time domain signalAnd an originating pilot time domain signal pm,nComparing to obtain estimated phase noise For phase noiseTaking conjugation;
a multiplier for multiplying the phase noise of the inputAnd the OFDM time domain signal xm,nMultiplying to obtain a coarse compensation result Wherein j represents an imaginary number;
the fine compensation module comprises:
FFT unit for pairingFFT to obtain frequency domain constellation symbol
Wherein k represents the serial number of a subcarrier, and N represents the number of sampling points of a single OFDM signal symbol;
a pre-decision unit for comparingCarrying out pre-judgment; the pre-decision unit specifically adopts the principle of closest constellation distance to perform pre-decision;
IFFT unit for decidingIFFT inverse transformation is carried out to obtain a time domain reference signal Where dec () represents a pre-decision;
a time domain partitioning unit for respectively performing coarse compensation on the m-th symbolsAnd the time domain reference signal of the m-th symbolPartitioning according to sampling order
Wherein N isSIndicating the number of partitions;
andthe q-th partition expansion specifically comprises the following steps:
wherein S represents the number of samples within a partition, and [ N/N ═ SS]，[]Represents rounding down;
a phase correction unit for correcting phase of the phase difference signalFor reference, estimation is based on the least squares principleIs divided into zones
Wherein,*represents a conjugate transpose;-represents a complex conjugate;
reusing partitioned phase errorsPhase correction is carried out on each subarea to obtain a fine-compensated OFDM time domain signalThe method specifically comprises the following steps:
generally, compared with the prior art, the technical scheme of the invention has the following technical characteristics and beneficial effects:
(1) the invention adopts a cascaded second-order compensation structure, combines RF coarse compensation and partition phase correction, and achieves excellent compensation performance with lower cost compared with the existing RF pilot frequency compensation scheme, and meanwhile, the low device requirement also increases the compensation universality;
(2) the two-stage compensation is the compensation operation executed in the time domain, the instantaneous phase distortion can be recorded for each sampling point, the modeling error does not exist, and compared with subcarrier pilot frequency, the inter-carrier interference ICI noise compensation is more efficient;
(3) in the invention, the phase deflection caused by the link nonlinearity is further estimated by adopting the subarea phase correction, and compared with the existing scheme of compensating the laser phase noise, the scheme can also relieve the phase distortion caused by the link nonlinearity and improve the tolerance of the signal to the overall phase damage.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of the system of the present invention;
FIG. 2 shows an embodiment of the present invention relating to a structure at a location where a receiver is located
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The structure of the embodiment of the system of the invention is shown in fig. 1, and comprises a coarse compensation module and a fine compensation module. The coarse compensation module comprises a time domain sampling input 1, a digital low-pass filter 2, a pilot frequency comparison conjugation unit 3, a multiplier 4 and a coarse compensation result output 5; the fine compensation module comprises an FFT (fast Fourier transform) 6, a pre-decision unit 7, an IFFT (inverse fast Fourier transform) 8, a time domain partitioning unit 9 and a phase correction unit 10.
The connection structure is as follows:
a coarse compensation module: the first end of the time domain sampling input 1 is connected to the multiplier 4 as the first input, the second end of the time domain sampling input 1 is connected to the digital low-pass filter 2, the result of the digital low-pass filter 2 is sent to the pilot frequency comparison conjugation unit 3, the result is used as the second input of the multiplier 4, and the result is multiplied and then is output as a coarse compensation result 5;
a fine compensation module: the coarse compensation result output 5 is used as the module input, the first path of signal passes through the FFT transformation 6, the pre-decision unit 7 and the IFFT inverse transformation 8 in sequence and then is sent to the time domain partition unit 9; the other path of the coarse compensation result output 5 is directly sent to the time domain partitioning unit 9; the two groups of outputs of the time domain partitioning unit 9 pass through the phase correction unit 10 to obtain a fine compensation result.
In the embodiment of the invention, in the coarse compensation module, a time domain sampling input 1 carrying a radio frequency pilot frequency is extracted by a digital low-pass filter 2 to obtain a pilot frequency signal, and then a pilot frequency comparison conjugation unit 3 is used for obtaining conjugation of phase noise. The conjugate result is multiplied with the time domain sample input 1 in multiplier 4 to obtain the output 5 of the coarse compensation result.
And outputting a coarse compensation result 5 as a fine compensation module for input, directly sending one path of signal to a time domain partitioning unit 9, and performing pre-decision operation on the other path of signal to obtain a frequency domain reference signal through an FFT (fast Fourier transform) 6 to a frequency domain constellation through a pre-decision unit 7. The reference signal is inverse transformed 8 to the time domain by the IFFT and then sent to the time domain partitioning unit 9. The reference signal partitioned by the time domain partitioning unit 9 and the coarse compensation signal are sent to the phase correction unit 10 together for partition correction, and finally the fine compensated time domain signal is output.
The invention is further described with reference to the following figures and specific examples. The present invention will be described in detail with respect to a CO-OFDM signal carrying a radio frequency pilot at a total subcarrier number of 128, an effective subcarrier number of 100, a symbol rate of 10GS/s, 16QAM modulation, a data rate of 29 Gb/s.
As shown in FIG. 2, the signal light and the intrinsic light (operating wavelength of the transceiver is 1552.5nm, linewidth is 500MHz) are first sent to the optical coherent detector to be demodulated into IQ two-path baseband signals. For the baseband signal, the sampled signal is sent to the coarse compensation module, i.e. the RF pilot in fig. 2 is primarily compensated. In this unit, two real IQ signals are first combined into one complex signal to obtain the time-domain sample input 1 in the coarse compensation module of fig. 1. Then, a pilot signal is obtained by extracting through a digital low-pass filter with the bandwidth of 40MHz, and the pilot signal is multiplied with the original complex signal in a multiplier 4 after conjugation to obtain an initial compensation result. Thereafter, the signal is first subjected to synchronization, cyclic prefix removal, serial-to-parallel conversion, channel equalization, linear phase estimation, frequency offset correction, and the like, and the result is used as an input of the fine compensation module, i.e., the fine compensation in fig. 2. In the unit, an input signal is divided into two paths, one path is directly sent to a time domain partitioning unit 9, the other path of signal is transformed to a frequency domain constellation through a 128-point FFT 6 and is subjected to a pre-decision operation through a pre-decision unit 7 to obtain a frequency domain reference signal, and the pre-decision uses a nearest distance principle. After that, the reference signal is transformed to the time domain through a 128-point inverse IFFT 8 and then sent to a time domain partitioning unit 9, and zero padding is uniformly applied to the rest positions in the inverse IFFT according to the principle of correspondence between the signal and the subcarrier at the originating end. In the time domain partition 9, the partition length S is taken to be 4, that is, 32 partitions are subjected to the partition operation. Thereafter, a correction phase for each of the partitions is calculated in the phase correction unit 10 and corrected one by one. Finally, the output serial bit sequence can be obtained after FFT, QAM mapping and parallel-serial conversion in FIG. 2.
It will be appreciated by those skilled in the art that the foregoing is only a preferred embodiment of the invention, and is not intended to limit the invention, such that various modifications, equivalents and improvements may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A CO-OFDM system phase noise compensation method based on RF pilot frequency is characterized in that the method specifically comprises the following steps:
(1) OFDM time-domain signal x containing RF pilotsm,nPerforming digital low-pass filtering to obtain pilot frequency time domain signalm, n respectively representing OFDM time-domain signalsSymbol sequence numbers and sampling point sequence numbers in a single symbol;
(2) pilot time domain signalAnd an originating pilot time domain signal pm,nComparing to obtain estimated phase noiseThen byObtaining a coarse compensation result
(3) To pairFFT to obtain frequency domain constellation symbolWherein k represents a subcarrier sequence number;
(4) to pairAfter pre-decision, time domain reference signals are obtained through Inverse Fast Fourier Transform (IFFT)
(5) Coarse compensation results for the mth symbol respectivelyAnd the time domain reference signal of the m-th symbolPartitioning and expanding according to the sampling sequence, wherein the q-th partition is respectivelyAnd
in the step (5), the coarse compensation results for the m-th symbol are respectively obtainedAnd the time domain reference signal of the m-th symbolPartitioning according to a sampling sequence, specifically:
wherein N isSIndicating the number of partitions;
andthe q-th partition expansion specifically comprises the following steps:
wherein S represents the number of samples within a partition, and [ N/N ═ SS]N represents the number of sampling points of a single OFDM signal symbol，[]Represents rounding down;
(6) to be provided withFor reference, estimateIs divided into zonesReuse ofPhase correction is carried out on each subarea, and finally the OFDM time domain signal after fine compensation is obtained
2. The method for compensating for phase noise of CO-OFDM system based on RF pilot frequency as claimed in claim 1, wherein said step (2) comprisesObtaining a coarse compensation resultThe method specifically comprises the following steps: to pairTaking conjugation, and with xm,nMultiplying to obtain a coarse compensation result
Wherein j represents an imaginary number.
3. The method for compensating phase noise of CO-OFDM system based on RF pilot frequency as claimed in claim 1, wherein said step (4) uses the principle of closest constellation distance to make pre-decision.
4. The method for compensating phase noise of CO-OFDM system based on RF pilot frequency as claimed in claim 1, wherein in said step (6) the signal is processed byFor reference, estimation is based on the least squares principleIs divided into zonesThe method specifically comprises the following steps:
wherein,*represents a conjugate transpose;-represents a complex conjugate;
using zonal phase errorsPhase correction is carried out on each subarea to obtain a fine-compensated OFDM time domain signalThe method specifically comprises the following steps:
5. a CO-OFDM system phase noise compensation system based on RF pilot frequency is characterized in that the system specifically comprises a coarse compensation module and a fine compensation module:
the coarse compensation module comprises:
a low-pass filtering unit for filtering the OFDM time domain signal x containing the RF pilotm,nPerforming digital low-pass filtering to obtain pilot frequency time domain signalm and n respectively represent the symbol serial number of the OFDM time domain signal and the serial number of a sampling point in a single symbol;
a pilot frequency comparison conjugation unit for comparing the pilot frequency time domain signalAnd an originating pilot time domain signal pm,nComparing to obtain estimated phase noiseFor phase noiseTaking conjugation;
a multiplier for multiplying the phase noise of the inputAnd the OFDM time domain signal xm,nMultiplying to obtain a coarse compensation result
The fine compensation module comprises:
FFT unit for pairingFFT to obtain frequency domain constellation symbolWherein k represents a subcarrier number；
A pre-decision unit for comparingCarrying out pre-judgment;
IFFT unit for decidingIFFT inverse transformation is carried out to obtain a time domain reference signal
A time domain partitioning unit for respectively performing coarse compensation on the m-th symbolsAnd the time domain reference signal of the m-th symbolPartitioning and expanding according to the sampling sequence, wherein the q-th partition is respectivelyAndcoarse compensation results of the m-th symbol in the time domain partition unit respectivelyAnd the time domain reference signal of the m-th symbolPartitioning according to a sampling sequence, specifically:
wherein N isSIndicating the number of partitions;
andthe q-th partition expansion specifically comprises the following steps:
wherein S represents the number of samples within a partition, and [ N/N ═ SS]N represents the number of sampling points of a single OFDM signal symbol]Represents rounding down;
a phase correction unit for correcting phase of the phase difference signalFor reference, estimateIs divided into zonesReuse ofPhase correction is carried out on each subarea, and finally the OFDM time domain signal after fine compensation is obtained
6. The system of claim 5, wherein the pre-decision unit is configured to perform the pre-decision specifically based on the principle that the constellation distance is closest.
7. The system of claim 5, wherein the phase correction unit is further configured to compensate for the phase noise of the CO-OFDM system based on the RF pilot signalFor reference, estimation is based on the least squares principleIs divided into zonesThe method specifically comprises the following steps:
wherein,*represents a conjugate transpose;-represents a complex conjugate;
using zonal phase errorsPhase correction is carried out on each subarea to obtain a fine-compensated OFDM time domain signalThe method specifically comprises the following steps:
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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 |
| 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 |
| CN109600332B (en) * | 2018-11-22 | 2020-08-28 | 华中科技大学 | CO-FBMC/OQAM modulation method and system |
| CN110011734B (en) * | 2019-04-18 | 2020-06-30 | 杭州电子科技大学 | CPE compensation method in CO-OFDM system based on pilot frequency and two-dimensional projection histogram |
| JP7361549B2 (en) * | 2019-09-18 | 2023-10-16 | Kddi株式会社 | Receiving device and program |
| CN110971307B (en) * | 2019-11-08 | 2021-07-27 | 华中科技大学 | Method for compensating interference between subcarriers inherent to SEFDM system |
| 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 |
| CN113132284B (en) * | 2020-01-16 | 2022-04-26 | 大唐移动通信设备有限公司 | Carrier phase tracking method and device |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171735A (en) * | 2017-05-16 | 2017-09-15 | 浙江工业大学 | A kind of big line width CO OFDM phase noise compensation methods of time-frequency domain Kalman filtering |
| CN108924075A (en) * | 2018-07-10 | 2018-11-30 | 电子科技大学 | Millimeter-wave systems both-end phase noise inhibition method based on maximum a posteriori criterion |
-
2018
- 2018-01-31 CN CN201810094702.9A patent/CN108199778B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171735A (en) * | 2017-05-16 | 2017-09-15 | 浙江工业大学 | A kind of big line width CO OFDM phase noise compensation methods of time-frequency domain Kalman filtering |
| CN108924075A (en) * | 2018-07-10 | 2018-11-30 | 电子科技大学 | Millimeter-wave systems both-end phase noise inhibition method based on maximum a posteriori criterion |
Non-Patent Citations (1)
| Title |
|---|
| 基于自适应步长ICA的CO-OFDM系统的偏振效应均衡研究;袁建国等;《半导体光电》;20151115(第11期);全文 * |
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