CN106850496A - A kind of quadrature amplitude modulation signal phase recovery method and device - Google Patents
A kind of quadrature amplitude modulation signal phase recovery method and device Download PDFInfo
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- CN106850496A CN106850496A CN201710121566.3A CN201710121566A CN106850496A CN 106850496 A CN106850496 A CN 106850496A CN 201710121566 A CN201710121566 A CN 201710121566A CN 106850496 A CN106850496 A CN 106850496A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3872—Compensation for phase rotation in the demodulated signal
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Abstract
The invention provides a kind of quadrature amplitude modulation signal phase recovery method and device, the method includes：Phase search is carried out to quadrature amplitude modulation signal, wherein, the phase search includes：Based on default piecemeal rule, quadrature amplitude modulation signal is divided into multiple signal data blocks and the rotation of multiple predetermined angles is carried out to each signal data in each signal data block；Real part and the summation of imaginary part error amount by the postrotational each signal data of multiple predetermined angles in each signal data block are calculated, it is determined that the corresponding target predetermined angle of minimum summation；According to the target predetermined angle, the phase estimation value of each signal data block is calculated；Quadrature amplitude modulation signal phase is recovered according to the phase estimation value.The present invention obtains phase estimation value by carrying out phase search to quadrature amplitude modulation signal, and search procedure is simplified in phase search, reduces algorithm complex, improves phase estimation performance so that phase recovery is more easy and efficient.
Description
Technical field
The present invention relates to technical field of photo communication, more particularly, to a kind of quadrature amplitude modulation signal phase recovery side
Method and device.
Background technology
At present, developing rapidly with internet, cloud computing, LTE and Internet of Things, various new applications continue to bring out and
Number of users sustainable growth, client traffic demand is continually changing, and data traffic constantly rises, and the bandwidth, business to network are quick
The aspects such as offer, network flexibility are proposed demand higher.This with regard to an urgent demand as flow arrying main body optical transport
Network data rate is more variable, modulation format is more various and frequency spectrum resource distribution is more flexible, to realize comprehensive dynamic
Many demands such as connection bandwidth, spectrum efficiency and power efficiency are most preferably adapted to, and flexible adaptation business and network performance change.
In order to realize the above-mentioned superelevation with self adaptation baud rate, BREATHABLE BANDWIDTH, flexible modulation form and spectral efficient
Fast flexibly optical transport, presently the most preferable settling mode is to polarize multiplexed quadrature amplitude modulation(PAM) (PM-mQAM) lattice using high-order
The coherent fiber communication technology of formula, and various damages are compensated using Digital Signal Processing in the receiving terminal of system.However,
As order of modulation is raised, influence of the phase noise that laser linewidth is introduced to systematic function is highlighted further, is seriously limit
Systematic function.In the prior art, phase recovery is typically carried out using blind phase search (BPS) and its improved multistage BPS algorithms,
BPS algorithms carry out phase estimation using a large amount of test phases to primary signal, to select optimal test phase as signal phase
Position estimated result.
Because BPS algorithms need to ensure phase estimation precision using a large amount of test phases, therefore the multiple multiplication for introducing is led
Cause algorithm complex very high, be not easy to realize；And BPS algorithms need to carry out hard decision for different modulation formats, enter one
Step increased computation complexity and processing delay, be unfavorable for its application in the flexible optical transmission system of ultrahigh speed.
The content of the invention
For the problem high of algorithm complex present in prior art, it is extensive that the embodiment of the present invention provides a kind of signal phase
Multiple method and device.
According to an aspect of the present invention, there is provided a kind of quadrature amplitude modulation signal phase recovery method, including：
Phase search is carried out to quadrature amplitude modulation signal, wherein, the phase search includes：S1, based on default point
Quadrature amplitude modulation signal then, is divided into multiple signal data blocks and each signal data in each signal data block is entered by slip gauge
The rotation of row multiple predetermined angle；S2, calculate in each signal data block by the postrotational each signal number of multiple predetermined angles
According to real part and imaginary part error amount summation, it is determined that the corresponding target predetermined angle of minimum summation；
According to the target predetermined angle, the phase estimation value of each signal data block is calculated；
Quadrature amplitude modulation signal phase is recovered according to the phase estimation value.
Wherein, it is described phase search is carried out to quadrature amplitude modulation signal to include：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
Wherein, it is described that multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times
Including：
S1 to S2, and after s 2, also including S3 to S6：
S3, based on default piecemeal rule, piecemeal is carried out respectively to each signal data block；
S4, the rotation that multiple predetermined angles are carried out to each signal data in each signal data block for being obtained after piecemeal；
By the postrotational each signal data of multiple predetermined angles in each signal data block obtained after S5, calculating piecemeal
The summation of real part and imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation；
S6, S3 to S5 is repeated, until reaching preset phase searching times.
Wherein, the number of predetermined angle is less than the number of predetermined angle in S1 in S5；And when repeating S3 to S6 every time,
The number of predetermined angle when increasing the number of predetermined angle in S5 newly less than preceding once execution.
Wherein, the default piecemeal rule is：Quadrature amplitude modulation signal N number of be one piece and be divided into K blocks, N as continuous
To preset positive integer；The multiple signal data block is K signal data block, and the signal data that each signal data block is included
Number be mutually all N.
Wherein, by the real part of the postrotational each signal data of multiple predetermined angles in described each signal data block of calculating
With the summation of imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation includes：
The real part and imaginary part of each signal data in each signal data block after predetermined angle rotation, are calculated institute
State real part error and imaginary part error of each signal data relative to default ideal constellation point；
Under each predetermined angle, by the real part of each signal data relative to default ideal constellation point of each signal data block
Error is added with imaginary part error, obtain through the postrotational each signal data of each predetermined angle real part and imaginary part error amount it is total
With；
Corresponding target predetermined angle when determining that error amount summation is minimum.
Wherein, the phase estimation value for calculating each signal data block according to the target predetermined angle includes：
With predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate；
According to the target predetermined angle, the corresponding point of the target predetermined angle and described is selected in the coordinate system
The corresponding point of the different predetermined angle of another two under coordinate system；
It is different from another two under the coordinate system respectively according to the corresponding point of the target predetermined angle in the coordinate system
The corresponding point of predetermined angle linear relationship, calculate phase estimation value.
Wherein, it is described to be included according to phase estimation value recovery quadrature amplitude modulation signal phase：
Phase estimation value to each signal data block carries out the phase estimation knot that solution winding obtains each signal data block
Really；
Phase compensation is carried out to described each signal data block according to the phase estimation result, recovers the quadrature amplitude
Modulating signal phase.
On the other hand, a kind of quadrature amplitude modulation signal phase recovery device is the embodiment of the invention provides, including：
Search module, for carrying out phase search to quadrature amplitude modulation signal, wherein, the search module includes：Adjust
Whole submodule, for based on default piecemeal rule, quadrature amplitude modulation signal being divided into multiple signal data blocks and to each
Each signal data in signal data block carries out the rotation of multiple predetermined angles；Treatment submodule, for calculating each signal number
According to real part and the summation of imaginary part error amount in block by the postrotational each signal data of multiple predetermined angles, it is determined that minimum summation
Corresponding target predetermined angle；
Computing module, for according to the target predetermined angle, calculating the phase estimation value of each signal data block；
Recovery module, for recovering quadrature amplitude modulation signal phase according to the phase estimation value.
Wherein, the search module is specifically used for body：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
Quadrature amplitude modulation signal phase recovery method provided in an embodiment of the present invention and device, adjust by quadrature amplitude
Signal processed carries out phase search and obtains phase estimation value, then to quadrature amplitude modulation signal to enter line phase by phase estimation value extensive
It is multiple, search procedure is simplified in phase search, reduce algorithm complex so that phase recovery process is more easy and high
Effect.
Brief description of the drawings
Fig. 1 is a kind of signal phase restoration methods flow chart provided in an embodiment of the present invention；
Fig. 2 is phase search method flow diagram provided in an embodiment of the present invention；
Fig. 3 is another phase search method flow diagram provided in an embodiment of the present invention；
Fig. 4 is the relation curve schematic diagram of the BER and OSNR of PM-16QAM provided in an embodiment of the present invention；
Fig. 5 is the relation curve schematic diagram of the BER and OSNR of PM-64QAM provided in an embodiment of the present invention；
Fig. 6 is the relation curve schematic diagram of the BER and OSNR of PM-256QAM provided in an embodiment of the present invention；
Fig. 7 is the relation curve schematic diagram of phase estimation deviation provided in an embodiment of the present invention and error amount；
Fig. 8 is a kind of signal phase recovery device schematic diagram provided in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
Fig. 1, Fig. 2 are a kind of signal phase restoration methods flow chart provided in an embodiment of the present invention, as shown in figure 1, the party
Method includes：
S101, phase search is carried out to quadrature amplitude modulation signal, wherein, the phase search includes：S1, based on default
Piecemeal rule, by quadrature amplitude modulation signal be divided into multiple signal data blocks and to each signal data block in each signal number
According to the rotation for carrying out multiple predetermined angles；S2, calculate in each signal data block by the postrotational each letter of multiple predetermined angles
The real part of number and the summation of imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation；
S102, according to the target predetermined angle, calculates the phase estimation value of each signal data block；
S103, quadrature amplitude modulation signal phase is recovered according to the phase estimation value.
In S101, quadrature amplitude modulation (Quadrature Amplitude Modulation, the QAM) signal is for
QAM signals after recovering through frequency deviation, it is to be understood that QAM signals need to be carried out orthogonal before phase recovery to QAM signals
The pretreatments such as imbalance compensation, fixed dispersion compensation, synchronous clock, balanced and polarization demultiplexing, offset estimation and compensation.
In S101, it is, according to certain computation rule, to be chosen from angle is soundd out that the phase search obtains phase estimation value
It is immediate with actual phase noise to be worth as the estimate of phase noise.
In S102, according to the target predetermined angle, the phase estimation value for calculating each signal data block is according to target
Predetermined angle determines the corresponding point of target predetermined angle, then by 2 points of left and right near corresponding point and the point by linearly forcing
Near method calculates phase estimation value.Wherein, the selection of 2 points of corresponding point and corresponding point or so is according to preset angle
It is abscissa to spend, and error amount summation is selection in the coordinate system that ordinate is set up.
In S103, it is to be estimated according to the phase calculated in S101 to recover quadrature amplitude modulation signal phase according to phase estimation value
Evaluation carries out solution winding, and former QAM signal phases are compensated, and the QAM signals after phase compensation are the letters of the QAM after phase recovery
Number.
As shown in Fig. 2 phase search includes in S101：
S1, based on default piecemeal rule, by quadrature amplitude modulation signal be divided into multiple signal data blocks and to each letter
Each signal data in number block carries out the rotation of multiple predetermined angles；
S2, calculate real part and imaginary part by the postrotational each signal data of multiple predetermined angles in each signal data block
The summation of error amount, it is determined that the corresponding target predetermined angle of minimum summation；
In S1, the default piecemeal rule is default to QAM signal piecemeals before processing QAM signals
Rule, general is：Total length for K data by it is continuous it is N number of be one piece and be divided into K blocks, N is default positive integer, will QAM signals
It is divided into K parts of signal data block so that each signal data block includes N number of signal data, wherein K>N, and K, N are preset value.
In S1, the predetermined angle is the exploration angle chosen, selected exploration angleWherein i is represented
Which exploration angle, B1Number of angles is soundd out for default.
In S2, real part and void by the postrotational each signal data of multiple predetermined angles in each signal data block are calculated
The summation of portion's error amount is to determine in each signal data block by the postrotational each signal data of predetermined angle relative to default
The real part error and imaginary part error of ideal constellation point, then real part error is added with imaginary part error obtains overall error, finally again will
The overall error of each signal data in each signal data block is added the error amount summation for obtaining each signal data block.Target is pre-
If corresponding predetermined angle when angle is above-mentioned error amount summation minimum.
The embodiment of the present invention is illustrated below, but is not limited the scope of the invention.For example 16QAM is believed
Number phase recovery is carried out, its process includes：16QAM signals after recovering to frequency deviation carry out piecemeal, and 16QAM signals are divided into
65536 signal data blocks, have 100 signal datas in each the signal data block being divided into, to 65536 signal data blocks
100 signal datas do 5 rotations of predetermined angle respectively, and predetermined angle is With
It is e through 5 postrotational real part errors of angle to calculate 100 signal datas in each signal data block1,i,k,R,
Imaginary part error is e1,i,k,I, real part error is added with imaginary part error and obtains overall error e1,i,k=e1,i,k,I+e1,i,k,R, then will be every
The overall error e of 100 signal datas in individual signal data block1,i,kAddition obtains error amount summation e1,i, which wherein i represents
The individual anglec of rotation, such as 1 represents2 represent3 represent4 represent5 representTo any certain data
Block, compares e1,iSize, obtain e1,3Minimum, i.e., corresponding target predetermined angle is
With predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate, target is found out in a coordinate system pre-
If angleCorresponding pointAndCorresponding 2 points of left and rightWithAccording toWithThe phase estimation value of each data block is calculated by straight-line intersection method.
65536 phase estimation values of data block are carried out with solution winding, then to 65536 signal datas of signal data block
Phase compensation is carried out, the 16QAM complex signals after 65536 phase recoveries are obtained.
The embodiment of the present invention obtains phase estimation value by carrying out phase search to quadrature amplitude modulation signal, then by phase
Estimate carries out phase recovery to quadrature amplitude modulation signal, and search procedure is simplified in phase search, with less exploration
The search procedure of angle and simplicity reduces the complexity of phase search, is adapted at a high speed receiving terminal DSP in flexibly optical transmission system
Treatment application.
On the basis of above-described embodiment, carrying out phase search to quadrature amplitude modulation signal includes：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
Specifically, carry out quadrature amplitude modulation signal phase search to include carrying out once phase to quadrature amplitude modulation signal
Position search or repeatedly phase search, specific searching times can as needed carry out free setting.
Preferably, phase search twice is carried out to quadrature amplitude modulation signal.Phase recovery for example is carried out to 16QAM signals
During, phase search number of times is set twice, i.e., to carry out first time phase according to the phase search process of embodiment described in Fig. 2
Second phase search is carried out after search again, to any certain data block, if first time phase search is to be divided into 16QAM signals
65536 signal data blocks, have 100 signal datas in each the signal data block being divided into, to 65536 signal data blocks
100 signal datas do 5 rotations of predetermined angle respectively, and predetermined angle isWithPhase
The result of search is that correspondence target predetermined angle is2 points of corresponding point and left and right areWithExploration angle is then then preset in second search procedure to 16QAM signals again piecemeal and again, by 16QAM signals
It is divided into 65536 signal data blocks, there are 80 signal datas in each signal data block, to 80 signal in each data block
Data carry out 4 rotations of predetermined angle, and predetermined angle isWith
It is e through 4 postrotational real part errors of angle to calculate 80 signal datas in each signal data block2,i,k,R,
Imaginary part error is e2,i,k,I, real part error is added with imaginary part error and obtains overall error e2,i,k=e2,i,k,I+e2,i,k,R, then by 80
The overall error e of individual signal data2,i,kAddition obtains error amount summation e2,i, which anglec of rotation wherein i represent, and such as 1 represents2 represent3 representRepresented with 4Compare e2,iSize, obtain e2,3Minimum, i.e., corresponding target predetermined angle
For
With predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate, target is found out in a coordinate system pre-
If angleCorresponding pointAndCorresponding 2 points of left and rightWithAccording toWithThe phase estimation value of each data block is calculated by straight-line intersection method.
65536 phase estimation values of data block are carried out with solution winding, then to 65536 signal datas of signal data block
Phase compensation is carried out, the 16QAM signals after 65536 phase recoveries are obtained.
The embodiment of the present invention more accurately can carry out phase recovery by setting phase search number of times to QAM signals, improve
The accuracy of phase recovery.
It is described that multiple phase search is carried out to quadrature amplitude modulation signal on the basis of embodiment described in Fig. 1 and Fig. 2,
Until reach preset phase searching times including：
S1 to S2, and after s 2, also including S3 to S6, as shown in Figure 3：
S3, based on default piecemeal rule, piecemeal is carried out respectively to each signal data block；
S4, the rotation that multiple predetermined angles are carried out to each signal data in each signal data block for being obtained after piecemeal；
By the postrotational each signal data of multiple predetermined angles in each signal data block obtained after S5, calculating piecemeal
The summation of real part and imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation；
S6, S3 to S5 is repeated, until reaching preset phase searching times.
Specifically, preset phase searching times are set to twice, and using phase search twice to 16QAM signals,
64QAM signals and 256QAM signals carry out phase recovery, as shown in Figure 4, Figure 5 and Figure 6：
Fig. 4 be phase recovery method provided in an embodiment of the present invention with existing BPS algorithm process 16QAM complex signals when
The comparison diagram of BER and OSNR curves.As seen from Figure 4, it is better than in phase recovery method performance provided in an embodiment of the present invention
Existing BPS algorithms, and phase recovery method provided in an embodiment of the present invention only needs 7 exploration angles during phase search
Degree can just cause that performance is better than existing BPS algorithms, and existing BPS algorithms need 32 test phases, i.e., calculated compared to traditional BP S
Method, Phase Retrieve Algorithm complexity proposed by the invention is substantially reduced.
Fig. 5 be phase recovery method provided in an embodiment of the present invention with existing BPS algorithm process 64QAM signals when BER
With the comparison diagram of OSNR curves.As seen from Figure 5, better than existing in phase recovery method performance provided in an embodiment of the present invention
BPS algorithms, and phase recovery method provided in an embodiment of the present invention only needs 9 to sound out angle just during phase search
Can cause that performance is better than existing BPS algorithms, and existing BPS algorithms need 64 test phases, i.e., compared to traditional BP S algorithms,
Phase Retrieve Algorithm complexity proposed by the invention is substantially reduced.
Fig. 6 be phase recovery method provided in an embodiment of the present invention with existing BPS algorithm process 256QAM signals when BER
With the comparison diagram of OSNR curves.As seen from Figure 5, better than existing in phase recovery method performance provided in an embodiment of the present invention
BPS algorithms, and phase recovery method provided in an embodiment of the present invention only needs 11 exploration angles during phase search
Can just cause that performance is better than existing BPS algorithms, and existing BPS algorithms need 64 test phases, i.e., calculated compared to traditional BP S
Method, Phase Retrieve Algorithm complexity proposed by the invention is substantially reduced.
According to above-mentioned phase recovery for the treatment effect of the QAM signals of different systems and the treatment of existing BPS algorithms
Contrast on effect, phase recovery method provided in an embodiment of the present invention can be in the case where algorithm complex be substantially reduced, raising property
Can, it is adapted to receiving terminal DSP Processing Algorithms in the flexible optical transmission system of ultrahigh speed.
On the basis of above-described embodiment, multiple predetermined angles described in S5 are different from multiple predetermined angles described in S1；
And when repeating S4 to S7 every time, increase the multiple predetermined angle in S5 newly.
Specifically, in S1 the value of predetermined angle according to predetermined angle number, general is set to
Two angles of the target predetermined angle for being set as being calculated according to first time search and target predetermined angle of predetermined angle or so in S5
Chosen in the interval that degree is determined, it is general, if the target predetermined angle that search is calculated for the first time is φ1,s, then interval
It is (φ1,s-1,φ1,s) and (φ1,s,φ1,s+1).Wherein, in interval (φ1,s-1,φ1,s) in, predetermined angle is generallyInterval (φ1,s,φ1,s+1) in, predetermined angle is generallyWherein, B1And B2It is default exploration angle number, B2Typically
It is set to positive even numbers.
Relative to the predetermined angle in S1, the predetermined angle in S5 is different from, and is wherein several default in S1
Increase predetermined angle in angular regions newly, it is to be understood that often increase a predetermined angle, hunting zone is narrower, search precision
It is higher.
On the basis of embodiment described in Fig. 1 and Fig. 2, the default piecemeal rule is：Total length is the data of K by company
It is continuous it is N number of be one piece and be divided into K blocks, N is default positive integer, will QAM signals be divided into K parts of signal data block so that each signal number
N number of signal data, wherein K are included according to block>N.
Specifically, the QAM total length of data for carrying out phase recovery as needed determines the signal data block number being divided into, root
The length of each each data block is determined according to QAM modulation form, it is ensured that the signal number included in each the signal data block being divided into
According to number it is appropriate, those skilled in the art can determine signal data number according to actual conditions, and the present embodiment does not limit each
The occurrence of the signal data number included in signal data block.
On the basis of Fig. 1 and Fig. 2 embodiments, by multiple predetermined angle rotations in described each signal data block of calculating
The real part of each signal data afterwards and the summation of imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation includes：
The real part and imaginary part of each signal data in each signal data block after predetermined angle rotation, are calculated institute
State real part error and imaginary part error of each signal data relative to default ideal constellation point；
Under each predetermined angle, by the real part of each signal data relative to default ideal constellation point of each signal data block
Error is added with imaginary part error, obtain through the postrotational each signal data of each predetermined angle real part and imaginary part error amount it is total
With；
Corresponding target predetermined angle when determining that error amount summation is minimum.
Specifically, set through presetting postrotational signal real part asImaginary part isIf place
When the signal of reason most high-order is 256QAM, according to
Calculate to obtain real part error e of the signal data relative to default ideal constellation point1i,k,, likewise, according toCalculate signal data relative to default ideal
The imaginary part error e of constellation point1,i,k,I。
By real part error e1,i,k,RWith imaginary part error e1,i,k,IAddition obtains overall error e1,i,k=e1,i,k,I+e1,i,k,R, then root
According to formulaCalculate to obtain each signal data error amount summation of each signal data block under this predetermined angle, wherein N
To preset the signal data number that each signal data block is included, which exploration angle i represents.
In error amount summation e1,iA minimum value of middle error identifying value, and corresponding examination is determined according to the value of now i
It is how many, that is, corresponding target predetermined angle when determining that error amount summation is minimum to visit angle.
The embodiment of the present invention in difference calculation process runs by using simple error calculation method, it is not necessary to and modulation lattice
The decision operation of formula association, it is not necessary to which multiplication is operated, and reduces complexity and processing delay, can be realized unrelated with modulation format
Blind treatment.
On the basis of Fig. 1 and Fig. 2, the phase for calculating each signal data block according to the target predetermined angle is estimated
Evaluation includes：
With predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate；
According to the target predetermined angle (corresponding predetermined angle when i.e. error amount summation is minimum), the coordinate system is selected
The different corresponding point of predetermined angle of another two under the interior corresponding point of the target predetermined angle and the coordinate system；
It is different from another two under the coordinate system respectively according to the corresponding point of the target predetermined angle in the coordinate system
The corresponding point of predetermined angle linear relationship, calculate phase estimation value.
It should be noted that as shown in fig. 7, Fig. 7 is the relation of different Q AM modulation format phase estimation deviations and error amount
Curve, as can be seen from the figure from QPSK to 256QAM, certain model of each modulation format near zero phase estimated bias
In enclosing, there is linear relationship in its phase estimation value, therefore we can find out at this by phase search with error amount summation
In linearly interval and be distributed on two straight lines 3 points, it is final phase to calculate the corresponding angle value of two straight-line intersections
Position estimate.
Specifically, with predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate, by taking for predetermined angle
Value and the corresponding error amount summation by data block after predetermined angle rotation are presented in dots in a coordinate system.
Determine that corresponding angle on target is φ when error amount summation is minimum2,i, then the target predetermined angle is in institute
It is (φ to state corresponding point on coordinate system2,s,e2,s), it is other 2 points under the selected point and the same coordinate system, general, in choosing
The left and right for taking the point respectively takes a bit, such as (φ2,s-1,e2,s-1) and (φ2,s+1,e2,s+1), wherein φ2,s-1＜ φ2,s＜ φ2,s+1。
So according to the (φ for choosing2,s,e2,s)、(φ2,s-1,e2,s-1) and (φ2,s+1,e2,s+1) 3 points approached by phase
Method can try to achieve final phase estimation value.
IfThen trying to achieve final phase estimation value is
IfThen phase estimation value
Corresponding angle on target is determined when the embodiment of the present invention is by finding error amount summation minimum, so that selected distribution
3 points in linearly interval, then phase estimation value is calculated by simple straight-line intersection method, computational methods are easy, quick and estimate
Meter high precision.
On the basis of above-described embodiment, recovering quadrature amplitude modulation signal phase according to the phase estimation value includes：
Phase estimation value to each signal data block carries out the phase that solution winding obtains each signal data block；
The phase of each the signal data block obtained by solution winding carries out phase compensation to signal, recovers quadrature amplitude modulation
Signal phase.
Wherein, the solution is wound as tradition solution operating winding, it is therefore an objective to overcome cycle-skipping, the phase compensation is according to phase
Estimate carries out phase only pupil filter to original signal data.Specifically, solution winding is carried out to the phase estimation value of each signal data block,
Phase compensation is carried out by the phase estimation value after solution winding again, the QAM signals after phase recovery are obtained, phase recovery is realized.
It will be appreciated that in the specific implementation, after carrying out phase estimation to signal data, can also be to output signal number
Processed according to symbol judgement etc. is carried out, finally give originator original bit sequence.
Fig. 8 is a kind of signal phase recovery device provided in an embodiment of the present invention, including search module 1, the and of computing module 2
Recovery module 3, wherein：
Search module 1 is used to carry out phase search to quadrature amplitude modulation signal, wherein, the search module 1 includes：Adjust
Whole submodule 11 is used to, based on default piecemeal rule, quadrature amplitude modulation signal is divided into multiple signal data blocks and to each
Each signal data in signal data block carries out the rotation of multiple predetermined angles；Treatment submodule 12 is used to calculate each signal number
According to real part and the summation of imaginary part error amount in block by the postrotational each signal data of multiple predetermined angles, it is determined that minimum summation
Corresponding target predetermined angle；
Computing module 2 is used for according to the target predetermined angle, calculates the phase estimation value of each signal data block；
Recovery module 3 is used to recover quadrature amplitude modulation signal phase according to the phase estimation value.
Specifically, QAM signals carry out piecemeal according to default piecemeal rule after adjustment submodule 11 recovers to frequency deviation so that point
Into each signal data block in include N number of signal data, then each signal data in each signal data block is made default many
The rotation of individual angle, the real part and imaginary part of each signal data after being rotated.
Treatment submodule 12 is by according to the real part and imaginary part and default preferable star of the postrotational each signal data of predetermined angle
Seat point is compared, the error amount of real part and imaginary part after obtaining being rotated according to predetermined angle, by the real part of each signal data and
Imaginary part error is added and obtains the overall error of each signal data, then by each signal data overall error in each signal data block
Be added, obtain each signal data block overall error and, and determine overall error and minimum when corresponding target predetermined angle.
Computing module 2 substitutes into predetermined angle as abscissa target predetermined angle, and error amount summation is set up for ordinate
Coordinate system in, calculate the phase estimation value of each signal data block.
Recovery module 3 carries out solution winding to the phase estimation value of each signal data block again, obtains each signal data block
Phase；Phase compensation is carried out by the phase estimation value after solution winding again, the QAM signals after phase recovery are obtained, phase is realized
Recover.
Signal phase recovery device provided in an embodiment of the present invention is carried out by search module to quadrature amplitude modulation signal
Phase search obtains phase estimation value, then that phase estimation value is entered into line phase to quadrature amplitude modulation signal by recovery module is extensive
It is multiple, search procedure is simplified in phase search, phase search is reduced with the search procedure of less exploration angle and simplicity
Complexity, be adapted to flexibly receiving terminal DSP treatment application in optical transmission system at a high speed.
On the basis of embodiment described in Fig. 8, the search module is specifically used for body：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
The predeterminable searching times of search module 1 reach the purpose that multiple phase search is carried out to QAM signals, specific search
Method can be found in above-described embodiment, and here is omitted.
Search module provided in an embodiment of the present invention 1 more accurately can be entered by setting phase search number of times to QAM signals
Line phase recovers, and improves the accuracy of phase recovery.
It should be noted that signal phase recovery device disclosed in embodiment and signal phase recovery side disclosed in embodiment
Method is corresponding, and the specific restriction of the effect and each module of signal phase recovery device is no longer described in detail in detail herein.
Finally, the present processes are only preferably embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of quadrature amplitude modulation signal phase recovery method, it is characterised in that including：
Phase search is carried out to quadrature amplitude modulation signal, wherein, the phase search includes：S1, based on default piecemeal rule
Then, quadrature amplitude modulation signal is divided into multiple signal data blocks and each signal data in each signal data block is carried out many
The rotation of individual predetermined angle；S2, calculate in each signal data block by the postrotational each signal data of multiple predetermined angles
The summation of real part and imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation；
According to the target predetermined angle, the phase estimation value of each signal data block is calculated；
Quadrature amplitude modulation signal phase is recovered according to the phase estimation value.
2. method according to claim 1, it is characterised in that described that phase search bag is carried out to quadrature amplitude modulation signal
Include：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
3. method according to claim 2, it is characterised in that described multiple phase is carried out to quadrature amplitude modulation signal to search
Rope, until reach preset phase searching times including：
S1 to S2, and after s 2, also including S3 to S6：
S3, based on default piecemeal rule, piecemeal is carried out respectively to each signal data block；
S4, the rotation that multiple predetermined angles are carried out to each signal data in each signal data block for being obtained after piecemeal；
By the real part of the postrotational each signal data of multiple predetermined angles in each signal data block obtained after S5, calculating piecemeal
With the summation of imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation；
S6, S3 to S5 is repeated, until reaching preset phase searching times.
4. method according to claim 3, it is characterised in that the number of predetermined angle is less than predetermined angle in S1 in S5
Number；And when repeating S3 to S6 every time, predetermined angle when increasing the number of predetermined angle in S5 newly less than preceding once execution
Number.
5. method according to claim 1, it is characterised in that the default piecemeal rule is：By quadrature amplitude modulation
Signal by it is continuous it is N number of be one piece and be divided into K blocks, N is default positive integer；The multiple signal data block is K signal data block, and
The number of the signal data that each signal data block is included mutually is all N.
6. method according to claim 1, it is characterised in that by multiple default in the calculating each signal data block
The real part of the postrotational each signal data of angle and the summation of imaginary part error amount, it is determined that the corresponding target predetermined angle of minimum summation
Including：
The real part and imaginary part of each signal data in each signal data block after predetermined angle rotation, are calculated described each
Real part error and imaginary part error of the signal data relative to default ideal constellation point；
Under each predetermined angle, the real part error by each signal data of each signal data block relative to default ideal constellation point
It is added with imaginary part error, obtains the summation of the real part and imaginary part error amount through the postrotational each signal data of each predetermined angle；
Corresponding target predetermined angle when determining that error amount summation is minimum.
7. method according to claim 1, it is characterised in that described that each signal is calculated according to the target predetermined angle
The phase estimation value of data block includes：
With predetermined angle as abscissa, error amount summation sets up coordinate system for ordinate；
According to the target predetermined angle, the corresponding point of target predetermined angle and the coordinate in the coordinate system are selected
System's different corresponding point of predetermined angle of lower another two；
It is different from another two under the coordinate system pre- respectively according to the corresponding point of the target predetermined angle in the coordinate system
If the linear relationship of the corresponding point of angle, phase estimation value is calculated.
8. method according to claim 1, it is characterised in that described quadrature amplitude is recovered according to the phase estimation value to adjust
Signal phase processed includes：
Phase estimation value to each signal data block carries out the phase estimation result that solution winding obtains each signal data block；
Phase compensation is carried out to described each signal data block according to the phase estimation result, recovers the quadrature amplitude modulation
Signal phase.
9. a kind of quadrature amplitude modulation signal phase recovery device, it is characterised in that including：
Search module, for carrying out phase search to quadrature amplitude modulation signal, wherein, the search module includes：Adjustment
Module, for based on default piecemeal rule, quadrature amplitude modulation signal being divided into multiple signal data blocks and to each signal
Each signal data in data block carries out the rotation of multiple predetermined angles；Treatment submodule, for calculating each signal data block
Middle real part and the summation of imaginary part error amount by the postrotational each signal data of multiple predetermined angles, it is determined that minimum summation correspondence
Target predetermined angle；
Computing module, for according to the target predetermined angle, calculating the phase estimation value of each signal data block；
Recovery module, for recovering quadrature amplitude modulation signal phase according to the phase estimation value.
10. a kind of device according to claim 9, it is characterised in that the search module is specifically used for body：
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
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