CN106330338B - A kind of signal phase regeneration method and device - Google Patents
A kind of signal phase regeneration method and device Download PDFInfo
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- CN106330338B CN106330338B CN201610696462.0A CN201610696462A CN106330338B CN 106330338 B CN106330338 B CN 106330338B CN 201610696462 A CN201610696462 A CN 201610696462A CN 106330338 B CN106330338 B CN 106330338B
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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
Abstract
The embodiment of the invention discloses a kind of signal phase regeneration method and device, the method includes：The corresponding constellation point of echo signal group is divided into M region, the M region includes at least the first judgement domain, the second judgement domain and third and adjudicate domain, wherein echo signal group contains at least one signal；The phase deflection in each judgement domain is estimated respectively；According to the phase deflection in each judgement domain, estimation is deflected for the first phase of the echo signal group, obtains the phase regenerated signal for the echo signal group；According to the phase regenerated signal and two values deflected for determining phase are preset, determine that the second phase for the echo signal group deflects；According to first phase deflection and second phase deflection, the phase of the echo signal group is regenerated.Using the embodiment of the present invention, the regenerated complexity of signal phase can reduce, improve the regenerated processing speed of phase.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of signal phase regeneration method and device.
Background technique
With the increasing of the transmission rate and transmission capacity of communication system and the lengthening of transmission range, to receiving end number
The requirement of signal processing is also higher and higher.In general, the recovery of the deflection of the phase as caused by laser linewidth is the number of coherent reception
Key component in word signal processing, the recovery of phase deflection is using phase regeneration techniques, so-called phase regeneration techniques
It is exactly the technology of inhibition or the compensation for phase noise in optical fiber telecommunications system.
In signal receiving end, the signal received carries out dispersion and frequency offset processing after analog-to-digital conversion, in order to accelerate to locate
Speed is managed, by going here and there and converting the signal of one group of group of acquisition, i.e. signal group, needs to carry out phase regeneration to each signal group.Phase
Position regeneration techniques can use blind phase acquisition method (blind phase searching, BPS), and traditional BPS is to laser line
Wide tolerance is higher, does not need to Modulation recognition processing, but computation complexity increases with the increase of test phase, for example,
32 test phases are generally taken for 16QAM (qam mode comprising 16 kinds of symbols), each signal will carry out 32 rotations
Turn (16 times to the left, 16 times to the right, to eliminate the influence of positive and negative phase noise), adjudicate, ask away from and compare, the complexity of calculating is very
Greatly, the phase regeneration treatment speed of signal is slower.
As it can be seen that the regeneration method of traditional signal phase based on BPS, computation complexity is larger, signal phase regeneration compared with
Slowly.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of signal phase regeneration method and device, to reduce signal phase again
Raw complexity improves the regenerated processing speed of phase.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of signal phase regeneration method, the method includes：
The corresponding constellation point of echo signal group is divided into M region, domain, the are adjudicated including at least first in the M region
Two judgement domains and third adjudicate domain, wherein the echo signal group contains at least one signal；
The phase deflection in each judgement domain is estimated respectively；
According to the phase deflection in each judgement domain, estimation is deflected for the first phase of the echo signal group, is obtained
For the phase regenerated signal of the echo signal group；
According to the phase regenerated signal and two values deflected for determining phase are preset, determines and is directed to the target
The second phase of signal group deflects；
According to first phase deflection and second phase deflection, the phase of the echo signal group is regenerated.
Preferably, the M region further includes for the first judgement domain and the second judgement domain, the second judgement domain and the to be isolated
Two regions in three judgement domains.
Preferably, estimate the phase deflection in each judgement domain, including：
Domain is adjudicated for first judgement domain, the third, using formula：Estimate phase
Position deflection；
For second judgement domain, using formula：Estimate phase
Position deflection；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To sentence
Certainly in domain signal phase deflection the sum of.
Preferably, the phase according to each judgement domain deflects, and estimation is directed to the first phase of the echo signal group
Position deflection, including：
According to the phase deflection in each judgement domain and each corresponding default weight in judgement domain, estimation is for described
The first phase of echo signal group deflects.
Preferably, it is described according to the phase regenerated signal and preset for determine phase deflection two values, determination
For the second phase deflection of the echo signal group, including：
It is determined according to the phase regenerated signal and two values preset for determining phase deflection using dichotomy
For the second deflection phase of the echo signal group.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of signal phase regenerating unit, described device includes：
Division module, for the corresponding constellation point of echo signal group to be divided M region, the M region is included at least
First judgement domain, the second judgement domain and third adjudicate domain, wherein the echo signal group contains at least one signal；
First estimation module, for estimating the phase deflection in each judgement domain respectively；
Second estimation module, for being deflected according to the phase in each judgement domain, estimation is for the echo signal group
First phase deflection, obtains the phase regenerated signal for the echo signal group；
Determining module, for according to the phase regenerated signal and preset for determine phase deflection two values, really
Surely it is deflected for the second phase of the echo signal group；
Regeneration module regenerates the target letter for deflecting according to first phase deflection and the second phase
The phase of number group.
Preferably, the M region further includes for the first judgement domain and the second judgement domain, the second judgement domain and the to be isolated
Two regions in three judgement domains.
Preferably, first estimation module includes：First estimation submodule, the second estimation submodule；
The first estimation submodule, for adjudicating domain for first judgement domain, the third, using formula：Estimate phase deflection；
The second estimation submodule, for adjudicating domain for described second, using formula：Estimate phase deflection；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To sentence
Certainly in domain signal phase deflection the sum of.
Preferably, second estimation module, is specifically used for：
According to the phase deflection in each judgement domain and each corresponding default weight in judgement domain, estimation is for described
The first phase of echo signal group deflects.
Preferably, the determining module, is specifically used for：
It is determined according to the phase regenerated signal and two values preset for determining phase deflection using dichotomy
For the second deflection phase of the echo signal group.
As seen from the above technical solutions, a kind of signal phase regeneration method provided in an embodiment of the present invention and device, will
The corresponding constellation point of echo signal group divides M region, the M region include at least first adjudicate domain, second adjudicate domain and
Third adjudicates domain, wherein the echo signal group contains at least one signal；Estimate that the phase in each judgement domain is inclined respectively
Turn；According to the phase deflection in each judgement domain, estimation is deflected for the first phase of the echo signal group, is obtained for institute
State the phase regenerated signal of echo signal group；According to the phase regenerated signal and preset two deflected for determining phase
Value determines that the second phase for the echo signal group deflects；According to first phase deflection and the second phase
Deflection, regenerates the phase of the echo signal group.
Using technical solution provided in an embodiment of the present invention, the complexity of signal phase regeneration algorithm is reduced, is improved
The regenerated processing speed of phase.
Certainly, it implements any of the products of the present invention or method must be not necessarily required to reach all the above excellent simultaneously
Point.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of signal phase regeneration method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of signal phase regenerating unit provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
To solve prior art problem, the embodiment of the invention provides a kind of signal phase regeneration method and devices, below
It is described in detail respectively.
It should be noted that receiving end carries out analog-to-digital conversion, frequency offset processing and dispersion and non-linear benefit after receiving signal
It repays, and compensated digital signal is grouped simultaneously normalized, the constellation on planisphere being previously mentioned in the embodiment of the present invention
Point is all after normalized.Then using each group after normalized of signal as echo signal group, in group
Each digital signal is signal.The embodiment of the present invention with 16QAM (Quadrature Amplitude Modulation, it is orthogonal
Amplitude modulation) for, include 16 kinds of symbols, by taking every group of 32 signals as an example, carries out the phase regeneration of echo signal group.
Fig. 1 is a kind of flow diagram of signal phase regeneration method provided in an embodiment of the present invention, is included the following steps：
The corresponding constellation point of echo signal group is divided M region by S101, and the M region includes at least the first judgement
Domain, the second judgement domain and third adjudicate domain, wherein the echo signal group contains at least one signal.
Specifically, the M region further includes for the first judgement domain and the second judgement domain, the second judgement domain and the to be isolated
Two regions in three judgement domains.
S102 estimates the phase deflection in each judgement domain respectively.
Specifically, estimate the phase deflection in each judgement domain, it can basis：For first judgement domain, described the
Three judgement domains, using formula：Estimate phase deflection；For second judgement domain, using public affairs
Formula：Estimate phase deflection；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To sentence
Certainly in domain signal phase deflection the sum of.
S103 is deflected according to the phase in each judgement domain, and estimation is deflected for the first phase of the echo signal group,
Obtain the phase regenerated signal for the echo signal group.
Specifically, the phase according to each judgement domain deflects, estimation is directed to the first phase of the echo signal group
Position deflection can be directed to according to the phase deflection and each corresponding default weight in judgement domain, estimation in each judgement domain
The first phase of the echo signal group deflects.
S104 according to the phase regenerated signal and presets two values deflected for determining phase, determines and be directed to institute
State the second phase deflection of echo signal group.
Specifically, it is described according to the phase regenerated signal and preset for determine phase deflection two values, determination
For the second phase deflection of the echo signal group, according to the phase regenerated signal and can preset for determining phase
Two values of deflection determine the second deflection phase for the echo signal group using dichotomy.
S105 deflects according to first phase deflection and the second phase, regenerates the phase of the echo signal group
Position.
It will be appreciated by persons skilled in the art that in the prior art, being divided according to the amplitude of signal in echo signal group
For 3 regions, respectively：First judgement domain, the second judgement domain and third adjudicate domain, for estimating that first phase deflects.And
In practical application, part signal may be caused due to dispersion, the bad disperse caused in amplitude of nonlinear compensation etc.
Constellation point should not participate in adjudicating, and the embodiment of the present invention increases region on the basis of three judgement domains, will fall in these regions
Interior constellation point is not involved in judgement, so that a point domain caused by due to dispersion, nonlinear compensation are bad etc. be avoided to misjudge, improves
The correctness that the signal of echo signal group divides domain to handle.
In practical application, between the first judgement domain and the second judgement domain, the second judgement domain and third judgement domain, according to pre-
If decision boundaries determine two area of isolation, for two adjacent judgement domains are isolated, and fall in for two judgements are isolated
Constellation point in the region in domain is not involved in the estimation of phase deflection.
In practical application, phase noise, i.e., the phase in each judgement domain can be estimated with the formula for each judgement domain
Deflection, illustratively, the number of signals in three judgement domains is respectively 8,11,13, and according to the phase value of each constellation point, calculating is sentenced
The certainly phase deflection in domain, it is assumed that the result calculated is：The phase deflection in the first judgement domainSecond judgement domain
Phase deflectionThird adjudicates the phase deflection in domainPoint of the number of signals of the embodiment of the present invention
Cloth is only exemplary, and is not constituted a limitation of the invention.
It will be appreciated by persons skilled in the art that in view of the optical signal to noise ratio of the constellation point of different amplitudes is different, outer ring
Higher than inner ring (signal-to-noise ratio of the big constellation point of amplitude is higher than the small constellation point of amplitude), it is possible to the phase in three judgement domains be arranged
The weight of position deflection, to estimate that the phase of echo signal group deflects.Common weight has(from inner ring to
Outer ring), according to the calculated result of judgement domain phase deflection： Calculate target
The first time phase of signal group is deflected to
It will be appreciated by persons skilled in the art that echo signal group is revolved according to first time phase tilt value 0.013
Turn, obtain phase regenerated signal, there is also remaining phase noise for regenerated signal, needs to remaining phase noise
Phase deflection is carried out again.By choosing limited numerical value in preset two values as rotatable phase, respectively with these numbers
Value is that rotatable phase rotates phase regenerated signal, the sum of more postrotational signal and the squared difference of ideal signal,
Determine that an optimal values are deflected as the quadratic phase of echo signal group according to comparison result.
It will be appreciated by persons skilled in the art that by preset two values as the first rotatable phase and the second rotation phase
Position, is taken their median, is rotated using these three values as rotatable phase to phase regenerated signal.With postrotational regeneration letter
Number and ideal signal squared difference and be functional value, i.e., with after rotating between constellation point and ideal constellation point Euclidean distance it is flat
It just and is functional value.Compare target function value, when the corresponding target function value of median is not maximum, giving up makes objective function
It is worth maximum rotatable phase, other two rotatable phase is corresponding to become the first rotatable phase and the second rotatable phase, takes again
Their median calculates the target function value of median, is compared.In this way, until meeting condition：The corresponding mesh of median
Offer of tender numerical value is the threshold value that maximum value in three functional values or median and the spacing of endpoint value are less than setting, then stops
Two points, and so that the smallest rotatable phase of functional value is deflected as second phase.
Illustratively, using minimum phase metric between the constellation point of 16QAM as preset value, i.e.-π/16 and π/16 are then preset
Two value be-π/16 and π/16.First rotatable phase is π/16, the second rotatable phase is-π/16, median 0, according to mesh
Scalar functions(φ is rotatable phase, rkFor the signal of serial number k in phase regenerated signal, ykFor with rkIt is right
The ideal signal answered, P are the signal sum of phase regenerated signal) it acquires with the first rotatable phase, median, the second rotatable phase
The target function value f obtained for rotatable phase1、f2、f3, dichotomy is continued to use when being unsatisfactory for qualifications.Such as institute in table 1
Show, when the 3rd two timesharing, the target function value of median is maximum value, stops two points, corresponding with functional value the smallest 1.075
π/32 be second phase deflection.Using dichotomy, it is only necessary to calculate the first rotatable phase and second when the 1st time two points
The corresponding functional value of rotatable phase, as long as calculating the corresponding functional value of median every time later.
Table 1
The embodiment of the present invention regenerates 16QAM phase compared with traditional blind phase acquisition method, maintains good phase again
Raw ability, under identical search precision, traditional blind phase search needs to rotate signal with 32 test phases, sentence
Certainly, find a function the sequence of maneuvers such as value, and this method only needs the complexity of phase search to be enormously simplified, mentioned with 5 test phases
High processing speed.
It, can also be directly in the first rotatable phase and the second rotatable phase other than using dichotomy in practical application
Between choose multiple phase values, the comparison of functional value is carried out, according to the rule of functional value, so that finding makes the smallest phase of functional value
Place value is deflected using the phase value as second phase.
It will be appreciated by persons skilled in the art that first deflection phase be 0.013, second deflection phase be π/32
In the case of, the deflection phase of echo signal group is：0.013+ π/32=0.111175, then according to 0.111175 regeneration echo signal
Group phase.
As it can be seen that application present invention embodiment shown in FIG. 1, reduces the complexity of signal phase regeneration algorithm, improves
The regenerated processing speed of phase.
Fig. 2 is a kind of structural schematic diagram of signal phase regenerating unit provided in an embodiment of the present invention, may include：It divides
Module 201, the first estimation module 202, the second estimation module 203, determining module 204, regeneration module 205.
Division module 201, for the corresponding constellation point of echo signal group to be divided M region, the M region is at least wrapped
Include the first judgement domain, the second judgement domain and third judgement domain, wherein the echo signal group contains at least one signal.
Specifically, in practical application, the M region further includes for the first judgement domain and the second judgement domain, the to be isolated
Two regions in two judgement domains and third judgement domain.
First estimation module 202, for estimating the phase deflection in each judgement domain respectively.
Specifically, in practical application, first estimation module 202 includes：First estimation submodule, the second estimation submodule
Block (not shown)；
The first estimation submodule can be used for for first judgement domain, third judgement domain, using public affairs
Formula：Estimate phase deflection；
The second estimation submodule can be used for for second judgement domain, using formula：Estimate phase deflection；；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To sentence
Certainly in domain signal phase deflection the sum of.
Second estimation module 203, for being deflected according to the phase in each judgement domain, estimation is directed to the echo signal group
First phase deflection, obtain the phase regenerated signal for the echo signal group.
Specifically, in practical application, second estimation module 203 can be used for：According to the phase in each judgement domain
Deflection and each corresponding default weight in judgement domain, estimation are deflected for the first phase of the echo signal group.
Determining module 204, for according to the phase regenerated signal and preset for determine phase deflection two values,
Determine that the second phase for the echo signal group deflects.
Specifically, in practical application, the determining module 204 can be used for：According to the phase regenerated signal and in advance
If, using dichotomy, determining the second deflection phase for the echo signal group for determining two values of phase deflection
Position.
Regeneration module 205 regenerates the target for deflecting according to first phase deflection and the second phase
The phase of signal group.
As it can be seen that application present invention embodiment shown in Fig. 2, reduces the complexity of signal phase regeneration algorithm, improves
The regenerated processing speed of phase.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
Those of ordinary skill in the art will appreciate that all or part of the steps in realization above method embodiment is can
It is completed with instructing relevant hardware by program, the program can store in computer-readable storage medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disk, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. a kind of signal phase regeneration method, which is characterized in that the method includes：
The corresponding constellation point of echo signal group is divided into M region, the M region is sentenced including at least the first judgement domain, second
Certainly domain and third adjudicate domain, wherein the echo signal group contains at least one signal；
The phase deflection in each judgement domain is estimated respectively；
According to the phase deflection in each judgement domain, estimation is deflected for the first phase of the echo signal group, is directed to
The phase regenerated signal of the echo signal group；
According to the phase regenerated signal and two values deflected for determining phase are preset, determines and is directed to the echo signal
The second phase deflection of group；
According to first phase deflection and second phase deflection, the phase of the echo signal group is regenerated；
It is described according to the phase regenerated signal and to preset two values for determining phase deflection, it determines for the target
The second phase of signal group deflects, including：According to the phase regenerated signal and preset two deflected for determining phase
Value determines that the second phase for the echo signal group deflects using dichotomy.
2. the method according to claim 1, wherein the M region further includes for the first judgement domain to be isolated
With two regions in the second judgement domain, the second judgement domain and third judgement domain.
3. method according to claim 1 or 2, which is characterized in that estimate the phase deflection in each judgement domain, including：
Domain is adjudicated for first judgement domain, the third, using formula：Estimate that phase is inclined
Turn；
For second judgement domain, using formula：Estimate that phase is inclined
Turn；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To adjudicate domain
The sum of phase deflection of interior signal.
4. according to the method described in claim 3, it is characterized in that, the phase deflection according to each judgement domain, estimation
For the first phase deflection of the echo signal group, including：
The target is directed to according to the phase deflection in each judgement domain and each corresponding default weight in judgement domain, estimation
The first phase of signal group deflects.
5. a kind of signal phase regenerating unit, which is characterized in that described device includes：
Division module, for the corresponding constellation point of echo signal group to be divided M region, the M region includes at least first
It adjudicates domain, the second judgement domain and third and adjudicates domain, wherein the echo signal group contains at least one signal；
First estimation module, for estimating the phase deflection in each judgement domain respectively；
Second estimation module, for being deflected according to the phase in each judgement domain, estimation is directed to the first of the echo signal group
Phase deflection, obtains the phase regenerated signal for the echo signal group；
Determining module, for according to the phase regenerated signal and preset for determine phase deflection two values, determine needle
Second phase deflection to the echo signal group；
Regeneration module regenerates the echo signal group for deflecting according to first phase deflection and the second phase
Phase；
The determining module, is specifically used for：According to the phase regenerated signal and preset two deflected for determining phase
Value determines that the second phase for the echo signal group deflects using dichotomy.
6. device according to claim 5, which is characterized in that the M region further includes for the first judgement domain to be isolated
With two regions in the second judgement domain, the second judgement domain and third judgement domain.
7. device according to claim 5 or 6, which is characterized in that first estimation module includes：First estimation submodule
Block, the second estimation submodule；
The first estimation submodule, for adjudicating domain for first judgement domain, the third, using formula：Estimate phase deflection；
The second estimation submodule, for adjudicating domain for described second, using formula：Estimate phase deflection；
Wherein, N is the number of signals that corresponding judgement domain includes, SiFor the signal for accordingly adjudicating serial number i in domain,To adjudicate domain
The sum of phase deflection of interior signal.
8. device according to claim 7, which is characterized in that second estimation module is specifically used for：
The target is directed to according to the phase deflection in each judgement domain and each corresponding default weight in judgement domain, estimation
The first phase of signal group deflects.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103138844A (en) * | 2013-02-04 | 2013-06-05 | 北京大学 | Phase noise compensation method of 16 quadrature amplitude modulation (QAM) modulating signals |
| CN103731392A (en) * | 2014-01-09 | 2014-04-16 | 北京邮电大学 | Regional separation nonlinear phase noise recovery method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138844A (en) * | 2013-02-04 | 2013-06-05 | 北京大学 | Phase noise compensation method of 16 quadrature amplitude modulation (QAM) modulating signals |
| CN103731392A (en) * | 2014-01-09 | 2014-04-16 | 北京邮电大学 | Regional separation nonlinear phase noise recovery method |
Non-Patent Citations (1)
| Title |
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| Low-Complexity Two-Stage Carrier Phase Estimation for 16-QAM Systems using QPSK Partitioning and Maximum Likelihood Detection;Yuliang Gao;《OSA/OFC/NFOEC 2011》;20111231;1-3页 * |
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