CN106850496B - 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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- CN106850496B CN106850496B CN201710121566.3A CN201710121566A CN106850496B CN 106850496 B CN106850496 B CN 106850496B CN 201710121566 A CN201710121566 A CN 201710121566A CN 106850496 B CN106850496 B CN 106850496B
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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
Abstract
The present invention provides a kind of quadrature amplitude modulation signal phase recovery method and devices, this method comprises: carrying out phase search to quadrature amplitude modulation signal, wherein, the phase search includes: that quadrature amplitude modulation signal is divided into multiple signal data blocks and is carried out the rotation of multiple predetermined angles to each signal data in each signal data block based on preset piecemeal rule；It calculates in each signal data block by the summation of the real and imaginary parts error amount of the postrotational each signal data of multiple predetermined angles, determines 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；Restore quadrature amplitude modulation signal phase 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 process is simplified in phase search, reduces algorithm complexity, 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 technique
Currently, with the rapid development of internet, cloud computing, LTE and Internet of Things, various new applications continue to bring out and
Number of users sustainable growth, client traffic demand constantly change, and data traffic is constantly soaring, quick to bandwidth, the business of network
Offer, network flexibility etc. are proposed higher demand.This optical transport with regard to an urgent demand as flow arrying main body
Network data rate is more variable, modulation format is more various and frequency spectrum resource distribution is more flexible, to realize comprehensive dynamic
More demands such as connection bandwidth, spectrum efficiency and power efficiency are most preferably adapted to, flexible adaptation business and network performance variation.
It is above-mentioned with adaptive baud rate, the superelevation of BREATHABLE BANDWIDTH, flexible modulation format and spectral efficient in order to realize
The flexible optical transport of speed, presently the most ideal settling mode are using high-order polarization multiplexed quadrature amplitude modulation (PM-mQAM) lattice
The coherent fiber communication technology of formula, and various damages are compensated using Digital Signal Processing in the receiving end of system.However,
As order of modulation increases, influence of the phase noise that laser linewidth introduces to system performance highlights further, seriously limits
System performance.In the prior art, phase recovery is generally carried out using blind phase search (BPS) and its improved multistage BPS algorithm,
BPS algorithm carries out phase estimation to original signal using a large amount of test phases, to select best test phase as signal phase
Position estimated result.
Since BPS algorithm need to guarantee phase estimation precision using a large amount of test phases, the multiple multiplication introduced is led
It causes algorithm complexity very high, is not easy to realize；And BPS algorithm needs to carry out hard decision for different modulation formats, into one
Step increases computation complexity and processing delay, is unfavorable for its application in the flexible optical transmission system of ultrahigh speed.
Summary of the invention
For the high problem of algorithm complexity existing in the 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, a kind of quadrature amplitude modulation signal phase recovery method is provided, comprising:
Phase search is carried out to quadrature amplitude modulation signal, wherein the phase search includes: S1, based on preset point
Slip gauge then, by quadrature amplitude modulation signal be divided into multiple signal data blocks and to each signal data in each signal data block into
The rotation of the multiple predetermined angles of row；S2, it calculates and passes through the postrotational each signal number of multiple predetermined angles in each signal data block
According to real and imaginary parts error amount summation, determine 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；
Restore quadrature amplitude modulation signal phase according to the phase estimation value.
Wherein, described to include: to quadrature amplitude modulation signal progress phase search
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
Wherein, described that multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times
Include:
S1 to S2, and after s 2, further include S3 to S6:
S3, it is based on preset 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 obtained after piecemeal；
S5, it calculates in each signal data block obtained after piecemeal by the postrotational each signal data of multiple predetermined angles
The summation of real and imaginary parts error amount determines the corresponding target predetermined angle of minimum summation；
S6, S3 to S5 is repeated, until reaching preset phase searching times.
Wherein, in S5 predetermined angle number be less than S1 in predetermined angle number；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 primary execution.
Wherein, the preset piecemeal rule are as follows: quadrature amplitude modulation signal N number of be one piece and be divided into K block, 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 includes
Number be mutually all N.
Wherein, described to calculate the real part for passing through the postrotational each signal data of multiple predetermined angles in each signal data block
With the summation of imaginary part error amount, determine that the corresponding target predetermined angle of minimum summation includes:
The real and imaginary parts of each signal data after being rotated according to predetermined angle in each signal data block, are calculated institute
State real part error and imaginary part error of each signal data relative to default ideal constellation point；
Real part under each predetermined angle, by each signal data of each signal data block relative to default ideal constellation point
Error is added with imaginary part error, obtains the total of the real and imaginary parts error amount through the postrotational each signal data of each predetermined angle
With；
Determine corresponding target predetermined angle when error amount summation minimum.
Wherein, the phase estimation value for calculating each signal data block according to the target predetermined angle includes:
Using predetermined angle as abscissa, error amount summation is that ordinate establishes coordinate system；
According to the target predetermined angle, the corresponding point of the target predetermined angle in the coordinate system and described is selected
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 target predetermined angle described in the coordinate system
The corresponding point of predetermined angle linear relationship, calculate phase estimation value.
Wherein, described to include: according to phase estimation value recovery quadrature amplitude modulation signal phase
Solution winding is carried out to the phase estimation value of each signal data block and obtains the phase estimation knot of each signal data block
Fruit；
Phase compensation is carried out to each signal data block according to the phase estimation result, restores the quadrature amplitude
Modulating signal phase.
On the other hand, the embodiment of the invention provides a kind of quadrature amplitude modulation signal phase recovery devices, comprising:
Search module, for carrying out phase search to quadrature amplitude modulation signal, wherein described search module includes: to adjust
Whole submodule, for quadrature amplitude modulation signal being divided into multiple signal data blocks and to each based on preset piecemeal rule
Each signal data in signal data block carries out the rotation of multiple predetermined angles；Submodule is handled, for calculating each signal number
According to the summation for the real and imaginary parts error amount for passing through the postrotational each signal data of multiple predetermined angles in block, minimum summation is determined
Corresponding target predetermined angle；
Computing module, for calculating the phase estimation value of each signal data block according to the target predetermined angle；
Recovery module, for restoring quadrature amplitude modulation signal phase according to the phase estimation value.
Wherein, described 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 and device provided in an embodiment of the present invention, by quadrature amplitude tune
Signal processed carries out phase search and obtains phase estimation value, then extensive to quadrature amplitude modulation signal progress phase by phase estimation value
It is multiple, search process is simplified in phase search, reduces algorithm complexity, so that phase recovery process is more easy and high
Effect.
Detailed description of the invention
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 embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the 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 carries out phase search to quadrature amplitude modulation signal, wherein the phase search includes: S1, based on default
Piecemeal rule, quadrature amplitude modulation signal is divided into multiple signal data blocks and to each signal number in each signal data block
According to the rotation for carrying out multiple predetermined angles；S2, it calculates and passes through the postrotational each letter of multiple predetermined angles in each signal data block
The summation of the real and imaginary parts error amount of number determines the corresponding target predetermined angle of minimum summation；
S102 calculates the phase estimation value of each signal data block according to the target predetermined angle；
S103 restores quadrature amplitude modulation signal phase according to the phase estimation value.
In S101, quadrature amplitude modulation (Quadrature Amplitude Modulation, the QAM) signal is
QAM signal after frequency deviation is restored, it is to be understood that QAM signal need to carry out QAM signal orthogonal before phase recovery
The pretreatment such as imbalance compensation, fixed dispersion compensation, clock synchronous, balanced and polarization demultiplexing, offset estimation and compensation.
In S101, it is to choose according to certain computation rule from souning out in angle that the phase search, which obtains phase estimation value,
Estimated value with the immediate value of actual phase noise as 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 the left and right two o'clock near corresponding point and the point by linearly forcing
Close method calculates phase estimation value.Wherein, the selection of corresponding point and corresponding point or so two o'clock is according to preset angle
Degree is abscissa, is chosen in the coordinate system that error amount summation is established for ordinate.
In S103, restoring quadrature amplitude modulation signal phase according to phase estimation value is to be estimated according to the phase calculated in S101
Evaluation carries out solution winding, compensates former QAM signal phase, and the QAM signal after phase compensation is the QAM letter after phase recovery
Number.
As shown in Fig. 2, phase search includes: in S101
S1, it is based on preset piecemeal rule, quadrature amplitude modulation signal is 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, the real and imaginary parts for passing through the postrotational each signal data of multiple predetermined angles in each signal data block are calculated
The summation of error amount determines the corresponding target predetermined angle of minimum summation；
In S1, the preset piecemeal rule is preset to QAM signal piecemeal before handling QAM signal
Rule, it is general are as follows: the data that total length is K by it is continuous it is N number of be one piece and be divided into K block, N is default positive integer, i.e., by QAM signal
It is divided into K parts of signal data blocks, so that it is preset value that each signal data block, which includes N number of signal data, wherein K > N, and K, N,.
In S1, the predetermined angle is the exploration angle chosen, selected exploration angleWherein i is indicated
Which exploration angle, B1Number of angles is soundd out to be default.
In S2, the real part and void for passing through 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 to obtain overall error with imaginary part error, finally again will
The overall error of each signal data in each signal data block is added to obtain the error amount summation of each signal data block.Target is pre-
If angle corresponding predetermined angle when being above-mentioned error amount summation minimum.
The embodiment of the present invention is illustrated below, but is not limited the scope of the invention.Such as 16QAM is believed
Number carry out phase recovery, process include: to frequency deviation restore after 16QAM signal carry out piecemeal, 16QAM signal is divided into
65536 signal data blocks have 100 signal datas in each signal data block being divided into, to 65536 signal data blocks
100 signal datas do the rotation of 5 predetermined angles respectively, and predetermined angle is With
It is e that 100 signal datas in each signal data block, which are calculated, through the postrotational real part error of 5 angles1,i,k,R,
Imaginary part error is e1,i,k,I, real part error is added to obtain overall error e with imaginary part error1,i,k=e1,i,k,I+e1,i,k,R, then will be every
The overall error e of 100 signal datas in a signal data block1,i,kAddition obtains error amount summation e1,i, wherein which i represents
A rotation angle, such as 1 representative2 represent3 represent4 represent5 representTo some any data
Block compares e1,iSize, obtain e1,3Minimum, i.e., corresponding target predetermined angle are
Using predetermined angle as abscissa, error amount summation is that ordinate establishes coordinate system, and it is pre- to find out target in a coordinate system
If angleCorresponding pointAndCorresponding left and right two o'clockWithAccording toWithThe phase estimation value of each data block is calculated by straight-line intersection method.
Solution winding, then the signal data to 65536 signal data blocks are carried out to the phase estimation value of 65536 data blocks
Carry out phase compensation, the 16QAM complex signal after obtaining 65536 phase recoveries.
The embodiment of the present invention obtains phase estimation value by carrying out phase search to quadrature amplitude modulation signal, then by phase
Estimated value carries out phase recovery to quadrature amplitude modulation signal, simplifies search process, in phase search with less exploration
Angle and easy search process reduce the complexity of phase search, are suitble to receiving end DSP in the flexible optical transmission system of high speed
Processing application.
On the basis of the above embodiments, 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, carrying out phase search to quadrature amplitude modulation signal includes carrying out primary phase to quadrature amplitude modulation signal
Position search or multiple phase search, specific searching times can carry out free setting as needed.
Preferably, phase search twice is carried out to quadrature amplitude modulation signal.Such as phase recovery is carried out to 16QAM signal
In the process, setting phase search number is twice, i.e., to carry out first time phase according to the phase search process of embodiment described in Fig. 2
Second of phase search is carried out after search again, to some any data block, if first time phase search is to be divided into 16QAM signal
65536 signal data blocks have 100 signal datas in each signal data block being divided into, to 65536 signal data blocks
100 signal datas do the rotation of 5 predetermined angles respectively, and predetermined angle isWithPhase
The result of position search is that corresponding target predetermined angle isCorresponding point and left and right two o'clock are
WithExploration angle is then then preset in second of search process to 16QAM signal again piecemeal and again, by 16QAM
Signal is divided into 65536 signal data blocks, there is 80 signal datas in each signal data block, to 80 in each data block
Signal data carries out the rotation of 4 predetermined angles, and predetermined angle isWith
It is e that 80 signal datas in each signal data block, which are calculated, through the postrotational real part error of 4 angles2,i,k,R,
Imaginary part error is e2,i,k,I, real part error is added to obtain overall error e with imaginary part error2,i,k=e2,i,k,I+e2,i,k,R, then by 80
The overall error e of a signal data2,i,kAddition obtains error amount summation e2,i, wherein which rotation angle i represents, such as 1 represents2 represent3 representIt is represented with 4Compare e2,iSize, obtain e2,3Minimum, i.e., corresponding target predetermined angle
For
Using predetermined angle as abscissa, error amount summation is that ordinate establishes coordinate system, and it is pre- to find out target in a coordinate system
If angleCorresponding pointAndCorresponding left and right two o'clockWithAccording toWithThe phase estimation value of each data block is calculated by straight-line intersection method.
Solution winding, then the signal data to 65536 signal data blocks are carried out to the phase estimation value of 65536 data blocks
Carry out phase compensation, the 16QAM signal after obtaining 65536 phase recoveries.
The embodiment of the present invention more accurately can be carried out phase recovery to QAM signal, be improved by setting phase search number
The accuracy of phase recovery.
It is described that multiple phase search is carried out to quadrature amplitude modulation signal on the basis of the embodiment described in Fig. 1 and Fig. 2,
Include: up to reaching preset phase searching times
S1 to S2, and after s 2, it further include S3 to S6, as shown in Figure 3:
S3, it is based on preset 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 obtained after piecemeal；
S5, it calculates in each signal data block obtained after piecemeal by the postrotational each signal data of multiple predetermined angles
The summation of real and imaginary parts error amount determines the corresponding target predetermined angle of minimum summation；
S6, S3 to S5 is repeated, until reaching preset phase searching times.
Specifically, set preset phase searching times to twice, and using phase search twice to 16QAM signal,
64QAM signal and 256QAM signal carry out phase recovery, as shown in Figure 4, Figure 5 and Figure 6:
When Fig. 4 is phase recovery method provided in an embodiment of the present invention and existing BPS algorithm process 16QAM complex signal
The comparison diagram of BER and OSNR curve.As seen from Figure 4, it is better than in phase recovery method performance provided in an embodiment of the present invention
Existing BPS algorithm, and phase recovery method provided in an embodiment of the present invention only needs 7 exploration angles during phase search
Degree can make performance better than existing BPS algorithm, and existing BPS algorithm needs 32 test phases, i.e., calculates compared to traditional BP S
Method, Phase Retrieve Algorithm complexity proposed by the invention substantially reduce.
BER when Fig. 5 is phase recovery method provided in an embodiment of the present invention and existing BPS algorithm process 64QAM signal
With the comparison diagram of OSNR curve.As seen from Figure 5, better than existing in phase recovery method performance provided in an embodiment of the present invention
BPS algorithm, and phase recovery method provided in an embodiment of the present invention only needs 9 exploration angles just during phase search
Performance can be made better than existing BPS algorithm, and existing BPS algorithm needs 64 test phases, i.e., compared to traditional BP S algorithm,
Phase Retrieve Algorithm complexity proposed by the invention substantially reduces.
BER when Fig. 6 is phase recovery method provided in an embodiment of the present invention and existing BPS algorithm process 256QAM signal
With the comparison diagram of OSNR curve.As seen from Figure 5, better than existing in phase recovery method performance provided in an embodiment of the present invention
BPS algorithm, and phase recovery method provided in an embodiment of the present invention only needs 11 exploration angles during phase search
Performance can be made better than existing BPS algorithm, and existing BPS algorithm needs 64 test phases, i.e., calculates compared to traditional BP S
Method, Phase Retrieve Algorithm complexity proposed by the invention substantially reduce.
According to above-mentioned phase recovery for the treatment effect of the QAM signal of different systems and the processing of existing BPS algorithm
Contrast on effect, phase recovery method provided in an embodiment of the present invention can be in the case where substantially reducing algorithm complexity, raising property
Can, it is suitble to receiving end DSP Processing Algorithm in the flexible optical transmission system of ultrahigh speed.
On the basis of the above embodiments, multiple predetermined angles described in S5 are different from multiple predetermined angles described in S1；
And when repeating S4 to S7 every time, the multiple predetermined angle is increased in S5 newly.
Specifically, the value of predetermined angle is general to be set as according to predetermined angle number in S1S5
Two angles of the target predetermined angle for being set as being calculated according to first time search of middle predetermined angle and target predetermined angle or so
It is chosen in the section of decision, in general, if the target predetermined angle that search calculates for the first time is φ1,s, then value interval be
(φ1,s-1,φ1,s) and (φ1,s,φ1,s+1).Wherein, in section (φ1,s-1,φ1,s) in, predetermined angle is generallySection (φ1,s,φ1,s+1) in, predetermined angle is generallyWherein, B1And B2For preset exploration angle number, B2Generally
It is set as 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 predetermined angle of every increase, search range is narrower, search precision
It is higher.
On the basis of the embodiment described in Fig. 1 and Fig. 2, the preset piecemeal rule are as follows: the data that total length is K are by company
Continue it is N number of be one piece and be divided into K block, N is default positive integer, i.e., QAM signal is divided into K parts of signal data blocks, so that each signal number
Include N number of signal data according to block, wherein K > 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 that each data block is determined according to QAM modulation format guarantees the signal number for including in each signal data block being divided into
According to number it is appropriate, those skilled in the art signal data number, the present embodiment can not limit each determines according to actual conditions
The occurrence for the signal data number for including in signal data block.
On the basis of Fig. 1 and Fig. 2 embodiment, described calculate in each signal data block rotates by multiple predetermined angles
The summation of the real and imaginary parts error amount of each signal data afterwards determines that the corresponding target predetermined angle of minimum summation includes:
The real and imaginary parts of each signal data after being rotated according to predetermined angle in each signal data block, are calculated institute
State real part error and imaginary part error of each signal data relative to default ideal constellation point；
Real part under each predetermined angle, by each signal data of each signal data block relative to default ideal constellation point
Error is added with imaginary part error, obtains the total of the real and imaginary parts error amount through the postrotational each signal data of each predetermined angle
With；
Determine corresponding target predetermined angle when error amount summation 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 formulaEach signal data error amount summation of each signal data block under this predetermined angle is calculated to obtain, wherein N
To preset the signal data number that each signal data block includes, which exploration angle i represents.
In error amount summation e1,iThe middle the smallest value of error identifying value, and corresponding examination is determined according to the value of i at this time
Visit angle be it is how many, i.e., determining error amount summation minimum when corresponding target predetermined angle.
The embodiment of the present invention does not need and modulates lattice by using simple error calculation method in difference calculation process runs
The associated decision operation of formula does not need multiplication operation, reduces complexity and processing delay, be able to achieve unrelated with modulation format
Blind processing.
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:
Using predetermined angle as abscissa, error amount summation is that ordinate establishes coordinate system；
According to the target predetermined angle when error amount summation minimum (i.e. corresponding predetermined angle), 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 target predetermined angle described 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 relationship of different Q AM modulation format phase estimation deviation 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 are linear relationships with error amount summation for phase estimation value, therefore we can be found out by phase search and fall in this
In linearly interval and be distributed on two straight lines 3 points, calculating the corresponding angle value of two straight-line intersections is final phase
Position estimated value.
Specifically, error amount summation is that ordinate establishes coordinate system, by taking for predetermined angle using predetermined angle as abscissa
The error amount summation of value and the corresponding data block after predetermined angle rotation is presented in dots in a coordinate system.
Determine that corresponding target angle is φ in error amount summation minimum2,i, then the target predetermined angle is in institute
Stating corresponding point on coordinate system is (φ2,s,e2,s), the other two o'clock under the point and the same coordinate system is selected, in general, selecting
The left and right of the point is taken respectively to take 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 of selection2,s,e2,s)、(φ2,s-1,e2,s-1) and (φ2,s+1,e2,s+1) 3 points approached by phase
Method can acquire final phase estimation value.
IfThen acquiring final phase estimation value isIfThen phase estimation value
Corresponding target angle is determined when the embodiment of the present invention is by finding error amount summation minimum, thus selected distribution
3 points in linearly interval, then calculate phase estimation value by simple straight-line intersection method, calculation method is easy, quick and estimate
It is high to count precision.
On the basis of the above embodiments, restoring quadrature amplitude modulation signal phase according to the phase estimation value includes:
Solution winding is carried out to the phase estimation value of each signal data block and obtains the phase of each signal data block；
The phase of each signal data block obtained by solution winding carries out phase compensation to signal, restores 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
Estimated value 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 signal after obtaining phase recovery realizes phase recovery.
It will be appreciated that in the specific implementation, it, can also be to output signal number after carrying out phase estimation to signal data
According to the processing such as symbol judgement is carried out, originator original bit sequence is finally obtained.
Fig. 8 is a kind of signal phase recovery device provided in an embodiment of the present invention, including search module 1,2 and of computing module
Recovery module 3, in which:
Search module 1 is used to carry out phase search to quadrature amplitude modulation signal, wherein described search module 1 includes: to adjust
Whole submodule 11 is used to quadrature amplitude modulation signal is divided into multiple signal data blocks and to each based on preset piecemeal rule
Each signal data in signal data block carries out the rotation of multiple predetermined angles；Processing submodule 12 is for calculating each signal number
According to the summation for the real and imaginary parts error amount for passing through the postrotational each signal data of multiple predetermined angles in block, minimum summation is determined
Corresponding target predetermined angle；
Computing module 2 is used to calculate the phase estimation value of each signal data block according to the target predetermined angle；
Recovery module 3 is used to restore quadrature amplitude modulation signal phase according to the phase estimation value.
Specifically, adjusting submodule 11 carries out piecemeal according to default piecemeal rule to QAM signal after frequency deviation recovery, make score
At each signal data block in include N number of signal data, then each signal data in each signal data block made default more
The rotation of a angle, the real and imaginary parts of each signal data after being rotated.
Handling submodule 12 will be according to the real and imaginary parts of the postrotational each signal data of predetermined angle and default ideal star
Seat point is compared, and obtains the error amount of real and imaginary parts after rotating according to predetermined angle, by the real part of each signal data and
Imaginary part error is added to obtain 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 it is minimum when corresponding target predetermined angle.
Computing module 2 substitutes into target predetermined angle using predetermined angle as abscissa, and error amount summation is ordinate foundation
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 signal after obtaining phase recovery realizes phase
Restore.
Signal phase recovery device provided in an embodiment of the present invention carries out quadrature amplitude modulation signal by search module
Phase search obtains phase estimation value, then by recovery module that phase estimation value is extensive to quadrature amplitude modulation signal progress phase
It is multiple, search process is simplified in phase search, and phase search is reduced with less exploration angle and easy search process
Complexity, be suitble to high speed flexibly receiving end DSP processing application in optical transmission system.
On the basis of the embodiment described in Fig. 8, described search module is specifically used for body:
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times.
Search module 1 can preset search number achieve the purpose that carry out multiple phase search to QAM signal, it is specific to search for
Method can be found in above-described embodiment, and details are not described herein again.
Search module 1 provided in an embodiment of the present invention by setting phase search number, can more accurately to QAM signal into
Row phase recovery improves the accuracy of phase recovery.
It should be noted that signal phase recovery side disclosed in signal phase recovery device disclosed in embodiment and 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 herein.
Finally, the present processes are only preferable embodiment, it is 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 replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (7)
1. a kind of quadrature amplitude modulation signal phase recovery method characterized by comprising
Multiple phase search is carried out to quadrature amplitude modulation signal, until reaching preset phase searching times, wherein described every time
Phase search includes S1-S2；
S1, it is based on preset piecemeal rule, quadrature amplitude modulation signal is divided into multiple signal data blocks and to each signal number
The rotation of multiple predetermined angles is carried out according to each signal data in block；S2, it calculates in each signal data block by multiple default
The summation of the real and imaginary parts error amount of the postrotational each signal data of angle determines the corresponding target preset angle of minimum summation
Degree, wherein the newly-increased predetermined angle of each phase search is increased newly in the predetermined angle region of a preceding phase search；
According to the target predetermined angle, the phase estimation value of each signal data block is calculated；
Restore quadrature amplitude modulation signal phase according to the phase estimation value.
2. the method according to claim 1, wherein predetermined angle number is primary less than preceding in phase search every time
The number of predetermined angle in phase search；And the number of the number of newly-increased predetermined angle predetermined angle when being less than preceding primary execution.
3. the method according to claim 1, wherein the preset piecemeal rule are as follows: by quadrature amplitude modulation
Signal by it is continuous it is N number of be one piece and be divided into K block, N is default positive integer；The multiple signal data block is K signal data block, and
The number for the signal data that each signal data block includes mutually is all N.
4. the method according to claim 1, wherein described calculate in each signal data block by multiple default
The summation of the real and imaginary parts error amount of the postrotational each signal data of angle determines the corresponding target predetermined angle of minimum summation
Include:
The real and imaginary parts of each signal data after being rotated according to predetermined angle in each signal data block are calculated described each
Real part error and imaginary part error of the signal data relative to default ideal constellation point；
Real part error under each predetermined angle, 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 and imaginary parts error amount through the postrotational each signal data of each predetermined angle；
Determine corresponding target predetermined angle when error amount summation minimum.
5. the method according to claim 1, wherein described calculate each signal according to the target predetermined angle
The phase estimation value of data block includes:
Using predetermined angle as abscissa, error amount summation is that ordinate establishes coordinate system；
According to the target predetermined angle, the corresponding point of target predetermined angle and the coordinate in the coordinate system are selected
It is the 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 target predetermined angle described in the coordinate system
If the linear relationship of the corresponding point of angle, phase estimation value is calculated.
6. the method according to claim 1, wherein described restore quadrature amplitude tune according to the phase estimation value
Signal phase processed includes:
Solution winding is carried out to the phase estimation value of each signal data block and obtains the phase estimation result of each signal data block；
Phase compensation is carried out to each signal data block according to the phase estimation result, restores the quadrature amplitude modulation
Signal phase.
7. a kind of quadrature amplitude modulation signal phase recovery device characterized by comprising
Search module, for carrying out multiple phase search to quadrature amplitude modulation signal, until reach preset phase searching times,
Wherein, search module includes: adjusting submodule, for quadrature amplitude modulation signal being divided into more based on preset piecemeal rule
A signal data block and the rotation that multiple predetermined angles are carried out to each signal data in each signal data block；Handle submodule
Block, for calculating the real and imaginary parts error for passing through the postrotational each signal data of multiple predetermined angles in each signal data block
The summation of value determines the corresponding target predetermined angle of minimum summation, wherein the newly-increased predetermined angle of each phase search is preceding
It is increased newly in the predetermined angle region of phase search；
Computing module, for calculating the phase estimation value of each signal data block according to the target predetermined angle；
Recovery module, for restoring quadrature amplitude modulation signal phase according to the phase estimation value.
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