CN108965194B - Method and device for signal phase recovery - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for recovering signal phase, wherein the method comprises the following steps: predicting errors generated by judging the rotated signals to be recovered according to each rotated signal to be recovered; obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered; for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise; and performing phase recovery on the signal to be recovered based on the error phase. The embodiment of the invention determines the error phase of each signal to be recovered in the estimation interval of the phase noise of the signal to be recovered, reduces the search range for determining the error phase of each signal to be recovered, and can quickly determine the error phase of each signal to be recovered. Therefore, the embodiment of the invention can improve the efficiency of phase recovery of the signal to be recovered.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for signal phase recovery.
Background
In the signal transmission process, a transmitted signal is called a signal to be recovered, the signal to be recovered is loaded on an optical carrier after being modulated, the signal is transmitted through an optical fiber link, the signal is amplified, and then the amplified signal is converted into a digital signal. The digital signal needs to be subjected to dispersion nonlinear compensation and frequency offset estimation, and then phase recovery is performed on the signal to be recovered.
In the prior art, a blind phase estimation method is used to recover the phase of a signal to be recovered, and the process is as follows:
the signals to be recovered in the same group are equally divided into 32 phases from-45 degrees to 45 degrees, and the degree difference between every two phases is 2.8 degrees; and rotating each group of signals to be recovered for 32 times according to the phase after the equal difference and the equal difference of the average difference, and obtaining each rotated signal to be recovered. Judging each rotated signal to be recovered by using a standard 16QAM (Quadrature Amplitude Modulation) constellation diagram, determining the coordinate of each judged signal to be recovered in the 16QAM constellation diagram, and calculating the Euclidean distance between each judged signal to be recovered and the rotated signal to be recovered; accumulating Euclidean distances between the signals to be recovered rotating the same phase and the judged signals to be recovered of the same phase, determining an error phase of the signals to be recovered, and performing phase recovery on the signals to be recovered by using the error phase.
In order to improve the phase accuracy of the signals to be recovered, the blind phase estimation method needs to calculate the euclidean distance between each judged signal to be recovered and the signal to be recovered after 32 rotations for 32 times according to the phase obtained by equally dividing each group of signals to be recovered by equal difference, and determines the error phase of the signal to be recovered based on the euclidean distances of a plurality of rotated signals to be recovered, which takes a long time. The prior art uses a blind phase estimation method to perform phase recovery on a signal to be recovered with too low efficiency.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for recovering a signal phase, which reduce the complexity of recovering the phase of a signal to be recovered by reducing the number of rotations of each group of signals to be recovered. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a method for signal phase recovery, including:
for each rotated signal to be recovered, estimating an error generated by judging the rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered;
for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise;
and performing phase recovery on the signal to be recovered based on the error phase.
Optionally, for each rotated signal to be recovered, predicting an error generated by determining the rotated signal to be recovered, including:
determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
and aiming at each rotated signal to be recovered, calculating the Euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
Optionally, obtaining an estimation interval of phase noise of the signal to be recovered, which is rotated by the same phase, from an error generated by determining the rotated signal to be recovered, includes:
accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
and determining the first phase and the second phase forming interval as an estimation interval of the phase noise of the signal to be recovered rotating the same phase.
Optionally, for an estimation interval of the phase noise of each signal to be recovered, determining an error phase for compensating the signal to be recovered from the estimation interval of the phase noise, including:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
Optionally, for an estimation interval of the phase noise of each signal to be recovered, determining an error phase for compensating the signal to be recovered from the estimation interval of the phase noise, including:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signals rotating the same noise phase, determining the noise phase of the rotation compensation signal when the accumulated sum of the first moments is minimum, and determining the noise phase as the error phase for compensating the signal to be recovered.
Optionally, the following steps are adopted to determine each rotated signal to be recovered:
for each signal to be recovered, rotating the signal to be recovered according to the N phases equally divided by the equal difference, and determining each rotated signal to be recovered; wherein N is a positive integer less than 32.
In a second aspect, an embodiment of the present invention provides an apparatus for signal phase recovery, including:
the estimation module is used for estimating the error generated by judging the rotated signal to be recovered aiming at each rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
the interval determining module is used for obtaining an estimation interval of phase noise of the signal to be recovered, which rotates the same phase, from an error generated by judging the rotated signal to be recovered;
the phase determining module is used for determining an error phase for compensating the signal to be recovered from the estimation interval of the phase noise for the estimation interval of the phase noise of each signal to be recovered;
and the phase recovery module is used for carrying out phase recovery on the signal to be recovered based on the error phase.
Optionally, the estimation module is specifically configured to:
determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
and aiming at each rotated signal to be recovered, calculating the Euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
Optionally, the interval determining module is specifically configured to:
accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
and determining the first phase and the second phase forming interval as an estimation interval of the phase noise of the signal to be recovered rotating the same phase.
Optionally, the phase determining module is specifically configured to:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
Optionally, the phase determining module is specifically configured to:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signals rotating the same noise phase, determining the noise phase of the rotation compensation signal when the accumulated sum of the first moments is minimum, and determining the noise phase as the error phase for compensating the signal to be recovered.
The device for recovering the signal phase provided by the embodiment of the invention further comprises: the signal determination module is specifically configured to:
for each signal to be recovered, rotating the signal to be recovered according to the N phases equally divided by the equal difference, and determining each rotated signal to be recovered; wherein N is a positive integer less than 32.
In yet another aspect of the present invention, there is also provided a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform a method of signal phase recovery as described in any one of the above.
In yet another aspect of the present invention, the present invention also provides a computer program product containing instructions, which when run on a computer, causes the computer to perform any one of the above-mentioned methods for signal phase recovery.
According to the method and the device for signal phase recovery, provided by the embodiment of the invention, the error generated by judging the rotated signal to be recovered is estimated aiming at each rotated signal to be recovered; obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered; for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise; and performing phase recovery on the signal to be recovered based on the error phase. Compared with the prior art, the method and the device for determining the error phase of the signal to be recovered determine the error phase of each signal to be recovered in the estimation interval of the phase noise of the signal to be recovered, reduce the search range for determining the error phase of each signal to be recovered, and can quickly determine the error phase of each signal to be recovered. Therefore, the embodiment of the invention can improve the efficiency of phase recovery of the signal to be recovered. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a flowchart of a method for signal phase recovery according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a constellation diagram of a standard 16QAM in the prior art;
FIG. 3 is a diagram illustrating the effect of the estimation interval of the phase noise according to the embodiment of the present invention;
FIG. 4 is a diagram illustrating an effect of a first moment of a rotation compensation signal when the rotation compensation signal rotates different noise phases according to an embodiment of the present invention;
fig. 5 is a block diagram of an apparatus for signal phase recovery according to an embodiment of the present invention;
fig. 6 is a structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.
According to the method and the device for signal phase recovery, provided by the embodiment of the invention, the error generated by judging the rotated signal to be recovered is estimated aiming at each rotated signal to be recovered; obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered; for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise; and performing phase recovery on the signal to be recovered based on the error phase. Compared with the prior art, the embodiment of the invention can improve the efficiency of phase recovery of the signal to be recovered.
The following briefly introduces a method for signal phase recovery according to an embodiment of the present invention.
The method for signal phase recovery provided by the embodiment of the invention is applied to electronic equipment, and further the electronic equipment can be a mobile phone, a computer, a server, intelligent mobile terminal equipment, wearable intelligent mobile terminal equipment and the like; but also to companies providing communication technology services. Without limitation, any electronic device that can implement the present invention is within the scope of the present invention.
As shown in fig. 1, a method for signal phase recovery according to an embodiment of the present invention includes:
s101, predicting an error generated by judging the rotated signal to be recovered aiming at each rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
for the above-mentioned determination process of each signal to be recovered after rotation, the following possible implementation manners may be adopted, and in one possible implementation manner, for each signal to be recovered, the signal to be recovered may be rotated according to N phases after equal-difference averaging, and each signal to be recovered after rotation may be determined.
Wherein N is a positive integer less than 32, and the phase of the equal difference average is from-45 degrees to 45 degrees.
Suppose N is 16; y represents the signal to be recovered;
representing the nth phase after equal difference averaging. The signals to be recovered after rotation are:
k represents the serial number of the signal to be recovered; n represents the number of phases after the equal difference averaging.
In the embodiment, each signal to be recovered is rotated by less than 32 phases after being equally divided according to the equal difference, compared with the prior art, the number of times of rotation of each signal to be recovered is reduced, and the efficiency of determining each signal to be recovered after rotation can be improved.
After determining each rotated signal to be recovered, in order to improve the efficiency of performing phase recovery on the signal to be recovered, the foregoing S101 may adopt at least one possible implementation manner as follows, and estimate an error generated when the rotated signal to be recovered is determined:
in one possible embodiment, the error generated by the decision of the rotated signal to be recovered is estimated by the following steps:
the method comprises the following steps: determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
step two: taking the signal of the constellation point closest to the rotated signal to be recovered as the judged signal to be recovered;
step three: and calculating the Euclidean distance between the signal to be recovered after judgment and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
Referring to fig. 2, fig. 2 is a constellation diagram of standard 16 QAM. The abscissa of the constellation has a value (-3, -1, 1, 3); the ordinate has a value (-3, -1, 1, 3). In the diagram, the hollow point is the signal to be recovered, and the coordinate point closest to the signal to be recovered is (1, 1), then in the constellation diagram, the formula d is usedk,n＝|yn-[yn]D|2And calculating the Euclidean distance between the coordinate point (1, 1) and the rotated signal to be recovered. dk,nRepresenting the Euclidean distance between the constellation point nearest to the rotated signal to be recovered and the rotated signal to be recovered; [ y ]n]DRepresenting the signal to be recovered after being judged; k represents the serial number of the signal to be recovered; n represents the sequence number of the phase after equal difference averaging; [ y ]n]DWherein D represents the pair ynJudging; y isnRepresenting the signal to be recovered after the nth phase rotation after the equal difference averaging.
In this embodiment, by using a 16QAM constellation diagram, the efficiency of determining the error generated by the decision of the signal to be recovered can be improved by calculating the euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered.
S102, obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered;
for the above process of determining the estimation interval of the phase noise, the following possible embodiments may be adopted, and in one possible embodiment, the following steps are adopted to obtain the estimation interval of the phase noise of the signal to be recovered, which is rotated by the same phase:
the method comprises the following steps: accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
step two: determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
the first phase is the phase rotated by the rotated signal to be recovered when the sum of the errors generated by judging the rotated signal to be recovered is minimum; the second phase is: and accumulating the sum of the errors generated by judging the rotated signal to be recovered, and the rotated phase of the rotated signal to be recovered when the sum is small.
Step three: and determining the first phase and the second phase forming interval as an estimation interval of the phase noise of the signal to be recovered rotating the same phase.
Referring to fig. 3, there are 4 signals to be recovered in fig. 3, which are A, B, C, D respectively; the signals to be recovered A, B are a group of signals to be recovered A, B with a rotation phase of 15 degrees, and the sum of errors generated by the decision is 20; the signal to be recovered A, B, which is rotated by 30 degrees in phase, is decided to have an error sum of 25; the sum of the errors resulting from the decision of the remaining phase-rotated signals to be recovered A, B is greater than 25. Therefore, the rotational phases 15 degrees and 30 degrees are selected as the estimation intervals of the phase noise of the signal to be recovered A, B.
In the embodiment, errors generated by judging the signals to be recovered rotating the same phase are accumulated, and when the error accumulation sum is minimum and the error accumulation sum is next hour, the estimation interval of the phase noise of the signals to be recovered can be reduced, so that the range of determining the error phase of the signals to be recovered can be reduced, and the efficiency of performing phase recovery on the signals to be recovered can be improved.
S103, aiming at the estimation interval of the phase noise of each signal to be recovered, determining an error phase for compensating the signal to be recovered from the estimation interval of the phase noise;
in order to improve the efficiency of phase recovery of the signal to be recovered, the step S103 may adopt at least one of the following possible implementations to determine the error phase for compensating the signal to be recovered:
in one possible embodiment, the error phase for compensating the signal to be recovered is determined by the following steps:
the method comprises the following steps: equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
step two: rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
step three: and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
In the embodiment, the error of the rotation compensation signal is calculated, the errors of the rotation compensation signal rotating the same noise phase are accumulated, and when the error accumulation sum is determined to be minimum, the noise phase rotating the rotation compensation signal can improve the efficiency of determining the error phase for compensating the signal to be recovered.
In another possible embodiment, the following steps are used to determine the error phase for compensating the signal to be recovered:
the method comprises the following steps: equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
step two: rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
wherein P is a positive integer less than or equal to 32.
Suppose P is 5; y represents the signal to be recovered;
is as followsA phase;
a second phase; θ is an estimation interval of the phase noise.
θPRepresenting the p-th noise phase. The rotation compensation signal is:
k represents the serial number of the signal to be recovered; p represents the sequence number of the noise phase;
step three: and calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signals rotating the same noise phase, determining the noise phase of the rotation compensation signal when the accumulated sum of the first moments is minimum, and determining the noise phase as the error phase for compensating the signal to be recovered.
Referring to fig. 4, the calculation formula for calculating the first moment of the rotation compensation signal is dk,p＝min(|t-[yk]hI)); t represents the abscissa in the 16QAM constellation diagram; [ y ]k]hThe abscissa values of k rotation compensation signals; [ y ]k]hH in (A) represents the number ykThe abscissa of (a); dk,pRotating the first moment of the kth rotation compensation signal of the p-th noise phase; k represents the serial number of the rotation compensation signal and also represents the serial number of the signal to be recovered; p represents the sequence number of the noise phase; d represents the first moment of the rotation compensation signal.
The first-order accumulated summation formula of the rotation compensation signals with the same noise phase is as follows:
e represents a first order of the rotation compensated signal; selecting the minimum e by rotating the noise phase theta of the rotation of the compensation signalendAs the error phase; thetaendRepresenting the error phase theta of the signal to be recoveredendEnd in represents the phase index corresponding to the minimum e value; dm,pA first pitch of the mth rotation compensation signal among the rotation compensation signals representing the P-th noise phase; m represents the serial number of the rotation compensation signal rotating the same noise phase; m represents the number of rotation compensation signals that rotate the same noise phase.
In fig. 4, the horizontal axis represents the noise phase of the rotation compensation signal, and the vertical axis represents the first moment of the rotation compensation signal. It can be seen that the first moment of the rotation compensation signal is the smallest when the rotation compensation signal rotates with a noise phase of 0 degrees.
According to the embodiment, the accuracy rate of determining the error phase for compensating the signal to be recovered can be improved by calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signals rotating the same noise phase, and determining the noise phase of the rotation compensation signal when the accumulated sum of the first moments is minimum.
In yet another possible implementation, for each estimation interval of the phase noise of the signal to be recovered, the variance of the signal to be recovered is calculated in the estimation interval of the phase noise; summing the variances of the signals to be recovered rotated by the same phase; determining the phase rotated by the signal to be recovered when the variance sum of the signal to be recovered rotating the same phase is minimum; the phase is determined as an error phase for compensating the signal to be recovered. Compared with a mode of determining and compensating the error phase of the signal to be recovered by calculating the first moment of the signal to be recovered, the embodiment can improve the efficiency of determining and compensating the error phase of the signal to be recovered.
And S104, performing phase recovery on the signal to be recovered based on the error phase.
For example: use of
And carrying out phase recovery on the signal to be recovered. Wherein y represents the signal to be recovered; y' represents the phase-recovered signal; thetaendRepresenting the error phase of the signal to be recovered.
Compared with the prior art, the method and the device for determining the error phase of the signal to be recovered determine the error phase of each signal to be recovered in the estimation interval of the phase noise of the signal to be recovered, reduce the search range for determining the error phase of each signal to be recovered, and can quickly determine the error phase of each signal to be recovered. Therefore, the embodiment of the invention can improve the efficiency of phase recovery of the signal to be recovered.
The following briefly introduces a signal phase recovery apparatus provided in the embodiments of the present invention.
As shown in fig. 5, an embodiment of the present invention provides an apparatus for signal phase recovery, including:
the estimation module 501 is configured to estimate an error generated by the decision of each rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
an interval determining module 502, configured to obtain an estimation interval of phase noise of the signal to be recovered, which rotates the same phase, from an error generated when the rotated signal to be recovered is determined;
a phase determining module 503, configured to determine, for each estimation interval of the phase noise of the signal to be recovered, an error phase for compensating the signal to be recovered from the estimation interval of the phase noise;
and a phase recovery module 504, configured to perform phase recovery on the signal to be recovered based on the error phase.
Optionally, the estimation module is specifically configured to:
determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
and aiming at each rotated signal to be recovered, calculating the Euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
Optionally, the interval determining module is specifically configured to:
accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
and determining the first phase and the second phase forming interval as an estimation interval of the phase noise of the signal to be recovered rotating the same phase.
Optionally, the phase determining module is specifically configured to:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal rotating when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
Optionally, the phase determining module is specifically configured to:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signals rotating the same noise phase, determining the noise phase of the rotation compensation signal when the accumulated sum of the first moments is minimum, and determining the noise phase as the error phase for compensating the signal to be recovered.
The device for recovering the signal phase provided by the embodiment of the invention further comprises: the signal determination module is specifically configured to:
for each signal to be recovered, rotating the signal to be recovered according to N phases which are equally divided by equal difference, and determining each rotated signal to be recovered; wherein N is a positive integer less than 32.
An embodiment of the present invention further provides an electronic device, as shown in fig. 6, including a processor 601, a communication interface 602, a memory 603, and a communication bus 604, where the processor 601, the communication interface 602, and the memory 603 complete mutual communication through the communication bus 604,
a memory 603 for storing a computer program;
the processor 601 is configured to implement the following steps when executing the program stored in the memory 603:
for each rotated signal to be recovered, estimating an error generated by judging the rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered;
for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise;
and performing phase recovery on the signal to be recovered based on the error phase.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In yet another embodiment of the present invention, there is also provided a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform a method of signal phase recovery as described in any of the above embodiments.
In a further embodiment of the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform a method of signal phase recovery as described in any of the above embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method of signal phase recovery, the method comprising:
for each rotated signal to be recovered, estimating an error generated by judging the rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
obtaining an estimation interval of phase noise of the signal to be recovered rotating the same phase from an error generated by judging the rotated signal to be recovered;
for the estimation interval of the phase noise of each signal to be recovered, determining the error phase for compensating the signal to be recovered from the estimation interval of the phase noise;
performing phase recovery on the signal to be recovered based on the error phase;
the obtaining of the estimation interval of the phase noise of the signal to be recovered, which is rotated by the same phase, from the error generated by the decision of the rotated signal to be recovered includes:
accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
and determining the first phase and the second phase forming interval as the estimation interval of the phase noise of the signal to be recovered rotating the same phase.
2. The method of claim 1, wherein estimating an error caused by the decision of the rotated signal to be recovered for each rotated signal to be recovered comprises:
determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
and aiming at each rotated signal to be recovered, calculating the Euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
3. The method of claim 1, wherein the determining, for each phase noise estimation interval of the signal to be recovered, an error phase for compensating the signal to be recovered from the phase noise estimation interval comprises:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
4. The method of claim 1, wherein the determining, for each phase noise estimation interval of the signal to be recovered, an error phase for compensating the signal to be recovered from the phase noise estimation interval comprises:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the first moment of the rotation compensation signal, accumulating the first moments of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal when the sum of the first moments is minimum, and determining the noise phase as the error phase for compensating the signal to be recovered.
5. The method of claim 1, wherein each signal to be recovered after rotation is determined by the steps of:
for each signal to be recovered, rotating the signal to be recovered according to N phases which are equally divided by equal difference, and determining each rotated signal to be recovered; wherein N is a positive integer less than 32.
6. An apparatus for signal phase recovery, the apparatus comprising:
the estimation module is used for estimating the error generated by judging the rotated signal to be recovered aiming at each rotated signal to be recovered; the error generated by judging the rotated signal to be recovered is determined by using the constellation point which is closest to each rotated signal to be recovered in a 16 Quadrature Amplitude Modulation (QAM) constellation diagram;
the interval determining module is used for obtaining an estimation interval of phase noise of the signal to be recovered, which rotates the same phase, from an error generated by judging the rotated signal to be recovered;
the phase determining module is used for determining an error phase for compensating the signal to be recovered from the estimation interval of the phase noise for the estimation interval of the phase noise of each signal to be recovered;
the phase recovery module is used for carrying out phase recovery on the signal to be recovered based on the error phase;
the interval determining module is specifically configured to:
accumulating errors generated by judging the signals to be recovered which rotate the same phase to obtain the accumulated sum of the errors generated by judging the rotated signals to be recovered;
determining the minimum sum of errors and the sub-hour sum of errors from the sum of accumulated errors generated by judging the rotated signal to be recovered, wherein the rotated signal to be recovered has a first phase and a second phase which are respectively rotated;
and determining the first phase and the second phase forming interval as the estimation interval of the phase noise of the signal to be recovered rotating the same phase.
7. The apparatus of claim 6, wherein the estimation module is specifically configured to:
determining a constellation point closest to each rotated signal to be recovered in a 16QAM constellation diagram;
and aiming at each rotated signal to be recovered, calculating the Euclidean distance between the constellation point closest to the rotated signal to be recovered and the rotated signal to be recovered, and determining the Euclidean distance as the error generated by judging the rotated signal to be recovered.
8. The apparatus of claim 6, wherein the phase determination module is specifically configured to:
equally dividing the estimated interval of the phase noise by P parts to obtain a noise phase;
rotating each signal to be recovered according to the noise phase, and taking the signal to be recovered after rotating according to the noise phase as a rotation compensation signal;
and calculating the error of the rotation compensation signal, accumulating the errors of the rotation compensation signal rotating the same noise phase, determining the noise phase of the rotation compensation signal when the error accumulation sum is minimum, and determining the noise phase of the rotation compensation signal when the error accumulation sum is minimum as the error phase for compensating the signal to be recovered.
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