CN107592156B - Optical signal to noise ratio obtaining method and device - Google Patents
Optical signal to noise ratio obtaining method and device Download PDFInfo
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Abstract
The embodiment of the invention provides an optical signal to noise ratio acquisition method and a device, wherein a plurality of groups of different channel parameter combinations are adopted to respectively process a preset sequence to acquire a plurality of estimation sequences, the estimation sequences are respectively cross-correlated with a signal to be detected to determine an estimation sequence with the highest cross-correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected, the preset sequence is compensated according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to acquire a compensated sequence, the OSNR of the signal to be detected can be acquired according to the signal to be detected and the compensated sequence, a brand new OSNR acquisition method is provided, the method can be applied to any training sequence, and the system overhead can be saved, meanwhile, the application range is expanded.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for acquiring an optical signal-to-noise ratio.
Background
The noise of the optical fiber link is derived from the spontaneous emission noise (ASE) of the optical amplifier, and the power of the ASE is accumulated according to the number of amplifiers in the optical fiber link. As with any other type of communication system, the optical signal-to-noise ratio (OSNR) directly affects the error rate of a communication link, and it is important to know the OSNR if the error rate is lower than a certain threshold value, that is, the OSNR is higher than a certain threshold value.
Currently, when an optical communication system is being shifted from a conventional point-to-point transmission mode to a dynamic optical network, a signal may be transmitted through different paths and the number of amplifiers, resulting in different OSNRs at the final reception. In order to accurately obtain the OSNR at the time of reception, a new method needs to be provided to obtain the OSNR.
Disclosure of Invention
The embodiment of the invention provides an optical signal to noise ratio acquisition method and device, which are used for providing a new OSNR acquisition method.
A first aspect of an embodiment of the present invention provides a method for acquiring an optical signal-to-noise ratio, including:
processing a preset sequence by adopting a plurality of groups of different channel parameter combinations respectively to obtain a plurality of estimation sequences, wherein the signal to be detected is a narrow-band signal;
performing cross correlation on the estimation sequences and a signal to be detected respectively, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected;
compensating the preset sequence according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence;
and acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
Optionally, the cross-correlating the plurality of estimation sequences with the signal to be measured respectively includes:
averagely dividing the signals to be detected into M groups according to the period of the signals to be detected, wherein each group comprises NPA signal frame of which M, NPAre all positive integers greater than 0;
for each group NPAveraging the signal frames to obtain M average signals;
cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
Optionally, before performing cross-correlation on the plurality of estimation sequences and the signal to be measured, the method further includes:
and carrying out autocorrelation on the signal to be detected to obtain the period of the signal to be detected.
Optionally, before obtaining the OSNR of the signal to be measured according to the signal to be measured and the compensated sequence, the method further includes:
performing autocorrelation on the signal to be detected, and determining the phase change of the signal to be detected;
and compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
Optionally, the obtaining the OSNR of the signal to be measured according to the signal to be measured and the compensated sequence includes:
performing cross correlation on each frame of the signal to be detected and the compensated sequence to acquire an estimated signal-to-noise ratio (ESNR) of the signal to be detected;
and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
Optionally, before the processing the preset sequence by using multiple groups of different channel parameter combinations respectively and obtaining multiple estimation sequences, the method further includes:
acquiring a plurality of sequences to be selected;
and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
Optionally, the channel parameter combination comprises one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
A second aspect of the embodiments of the present invention provides an optical signal-to-noise ratio obtaining apparatus, including:
the acquisition module is used for processing a preset sequence by adopting a plurality of groups of different channel parameter combinations respectively to acquire a plurality of estimation sequences, wherein the signal to be detected is a narrow-band signal;
the determining module is used for performing cross correlation on the estimation sequences and a signal to be detected respectively, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected;
the compensation module is used for compensating the preset sequence according to a group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence;
and the processing module is used for acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
Optionally, the determining module is specifically configured to averagely divide the signal to be detected into M groups according to the period of the signal to be detected, where each group includes NPA signal frame of which M, NPAre all positive integers greater than 0; for each group NPAveraging the signal frames to obtain M average signals; cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
Optionally, the apparatus further comprises: and the autocorrelation module is used for performing autocorrelation on the signal to be detected to obtain the period of the signal to be detected.
Optionally, the autocorrelation module is further configured to perform autocorrelation on the signal to be detected, and determine a phase change of the signal to be detected;
the device further comprises: and the phase compensation module is used for compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
Optionally, the processing module is specifically configured to perform cross-correlation between each frame of the signal to be detected and the compensated sequence, so as to obtain an ESNR of the signal to be detected; and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
Optionally, the apparatus further comprises: the selection module is used for acquiring a plurality of sequences to be selected; and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
Further, the channel parameter combinations include one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
A third aspect of the embodiments of the present invention provides an optical signal-to-noise ratio obtaining apparatus, including: a processor;
the processor is used for processing the preset sequence by adopting a plurality of groups of different channel parameter combinations to obtain a plurality of estimation sequences, wherein the signal to be detected is a narrow-band signal;
performing cross correlation on the estimation sequences and a signal to be detected respectively, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected;
compensating the preset sequence according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence;
and acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
Optionally, the processor is configured to perform cross-correlation on the multiple estimation sequences and a signal to be measured, specifically: averagely dividing the signals to be detected into M groups according to the period of the signals to be detected, wherein each group comprises NPA signal frame of which M, NPAre all positive integers greater than 0; for each group NPAveraging the signal frames to obtain M average signals; cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
Further, the processor is further configured to perform autocorrelation on the signal to be detected, and obtain a period of the signal to be detected.
Optionally, the processor is further configured to perform autocorrelation on the signal to be detected, and determine a phase change of the signal to be detected; and compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
Further, the processor is configured to obtain an optical signal to noise ratio OSNR of the signal to be detected according to the signal to be detected and the compensated sequence, specifically: performing cross correlation on each frame of the signal to be detected and the compensated sequence to acquire an estimated signal-to-noise ratio (ESNR) of the signal to be detected; and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
Optionally, the processor is further configured to obtain a plurality of sequences to be selected; and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
Wherein the channel parameter combination comprises one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
In the method and apparatus for acquiring an optical signal-to-noise ratio provided by the embodiment of the present invention, a plurality of sets of different channel parameter combinations are used to process a preset sequence respectively to acquire a plurality of estimation sequences, the estimation sequences are correlated with a signal to be detected respectively, an estimation sequence with the highest degree of cross-correlation with the signal to be detected and a set of channel parameter combinations corresponding to the estimation sequence with the highest degree of cross-correlation with the signal to be detected are determined, and then according to a group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be measured, compensating the preset sequence to obtain a compensated sequence, and obtaining the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence, thereby providing a novel OSNR obtaining method, and the method can be suitable for any training sequence, can save the system overhead and simultaneously enlarges the application range.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an application scenario of an optical signal-to-noise ratio acquisition method provided by the present invention;
fig. 2 is a schematic flow chart of a first method for acquiring an osnr according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an autocorrelation signal in the osnr obtaining method according to the present invention;
fig. 4 is a schematic flowchart of a second method for acquiring an osnr according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a third embodiment of a method for acquiring an optical signal-to-noise ratio according to the present invention;
fig. 6 is a schematic structural diagram of a first apparatus for acquiring an optical signal-to-noise ratio according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of an optical signal-to-noise ratio obtaining apparatus provided in the present invention;
fig. 8 is a schematic structural diagram of a third embodiment of an osnr obtaining apparatus according to the present invention;
fig. 9 is a schematic structural diagram of a fourth embodiment of an osnr obtaining apparatus according to the present invention.
Detailed Description
As optical communication systems are transitioning from point-to-point transmission to dynamic optical networks, meaning that a signal may travel through different paths and numbers of amplifiers and may eventually receive a different OSNR, embodiments of the present invention provide a way to measure the OSNR to more accurately measure the OSNR. The scheme may be applied to a Nyquist system or a faster-than-Nyquist system, which is not limited herein.
Fig. 1 is a schematic view of an application scenario of an optical signal-to-noise ratio acquisition mode provided by the present invention, as shown in fig. 1, a local oscillator optical signal output by a local oscillator laser interferes with an original signal, the interfered signal is a signal to be measured, and the signal to be measured is output to an OSNR measurement module for measurement.
The embodiment of the invention mainly relates to the content executed in the OSNR measuring module.
Fig. 2 is a schematic flow chart of a first embodiment of a method for acquiring an osnr provided by the present invention, as shown in fig. 2, the method includes:
s201, processing the preset sequence by adopting a plurality of groups of different channel parameter combinations respectively to obtain a plurality of estimation sequences.
S202, respectively carrying out cross correlation on the plurality of estimation sequences and the signal to be detected, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected.
The embodiments of the present invention may be mainly applied to a narrowband signal, that is, a signal to be measured is a narrowband signal, and optionally, the narrowband signal may be a single-polarization in-phase and quadrature component (IQ) signal, or a dual-polarization IQ signal, but is not limited herein.
Specifically, the signal to be measured may include: periodic pilots, random signals, and noise.
The method comprises the steps of firstly processing a preset sequence by adopting different channel parameter combinations, specifically adopting a preset formula or a preset algorithm to obtain a plurality of estimation sequences.
When a plurality of sets of channel parameter combinations are used to obtain a plurality of estimation sequences, each estimation sequence corresponds to one set of channel parameter combination, and after the estimation sequence with the highest degree of cross-correlation with the signal to be measured is determined, which set of channel parameter combination is obtained can be known, that is, one set of channel parameter combination corresponding to the estimation sequence with the highest degree of cross-correlation with the signal to be measured is determined.
And S203, compensating the preset sequence according to a group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected, and acquiring a compensated sequence.
And S204, acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
The preset sequence may be any sequence as long as a group of channel parameter combinations corresponding to an estimated sequence with the highest degree of cross-correlation with the signal to be detected is obtained after cross-correlation, and the preset sequence is compensated. Unlike the prior art, gray (Golay) sequences, constant amplitude zero auto-correlation (CAZAC) sequences, and the like may be selected in advance to calculate OSNR, and these sequences are not training sequences commonly used in optical communication systems, and a Cyclic Prefix (CP) is added when they are used, thereby increasing system overhead.
In this embodiment, a plurality of sets of different channel parameter combinations are used to process a preset sequence respectively to obtain a plurality of estimated sequences, the plurality of estimated sequences are cross-correlated with a signal to be detected respectively, an estimated sequence with the highest cross-correlation degree with the signal to be detected and a set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected are determined, the preset sequence is compensated according to the set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence, and the OSNR of the signal to be detected can be obtained according to the signal to be detected and the compensated sequence.
Fig. 3 is a schematic diagram of an autocorrelation signal in the osnr obtaining method provided in the present invention.
Optionally, before obtaining the OSNR of the signal to be measured according to the signal to be measured and the compensated sequence, the signal to be measured may be subjected to autocorrelation to determine a phase change of the signal to be measured, and the signal to be measured is compensated according to the phase change to obtain a compensated signal to be measured. And pilot frequency phases of each signal frame in the compensated signal to be detected are the same.
Referring to fig. 3, after the signal under test is self-correlated, a series of peaks occur, and there may be a continuous phase change in the series of peaks, which may be caused by a frequency difference between a transmitter and a receiver of the signal under test. In particular, the phase variation may be equal to the frequency difference Δ f between the transmitter and the receiver1In the period (T) of the signal to be measuredf) The portion of the phase difference generated by the internal accumulation that is not divisible by 2 π, and the frequency measured by the phase change of the peak is Δ f1Can not be 1/TfFractional part of the integer division. Then, the signal to be measured is compensated, i.e. compensatedThe frequency difference between the rear transmitter and the receiver can be 1/TfAnd (4) trimming.
The compensation of the signal to be measured according to the phase change may be fractional frequency offset compensation.
The signal to be detected is self-correlated, and the period T of the signal to be detected can be obtainedf. Specifically, according to a series of peaks after the autocorrelation of the signal to be measured, it can be determined that the length of a period is between two peaks.
Fig. 4 is a schematic flow chart of a second embodiment of the osnr obtaining method provided in the present invention, and as shown in fig. 4, the performing cross-correlation between the multiple estimation sequences and the signal to be measured respectively may include:
s401, averagely dividing the signal to be detected into M groups according to the period of the signal to be detected, wherein each group comprises NPA signal frame.
M, N thereinPAre all positive integers greater than 0. I.e. each cycle of the signal under test comprises NPA signal frame.
S402, for each group NPAveraging the signal frames to obtain M average signals.
In order to avoid the influence of the pilot frequency of the signal frame after averaging, the signal to be measured may be compensated before grouping, that is, in the embodiment of fig. 3, the signal to be measured is compensated according to the phase change, and the pilot frequency phase of each signal frame in the compensated signal to be measured is the same, so that the pilot frequency is not affected after averaging, and in addition, the power of the random signal portion and the noise in the signal to be measured is greatly reduced after averaging due to the randomness.
Due to the existence of the laser phase noise, if the estimated signal frame is too long, the phase difference of the pilot (pilot) of different frames may be large, and the averaging effect is affected, so that the pilot phase difference of different frames can be reduced by grouping first and then averaging.
S403, cross-correlating the M average signals with the plurality of estimated sequences, respectively.
Optionally, the channel parameter combination includes one or more of the following: polarization rotation angle theta, polarization mode dispersion
Clock phase Δ t, and integer part of frequency offset Δ f. The values of these parameters differ in different combinations of channel parameters.
Wherein, the integer part of the frequency deviation Δ f can be understood as the frequency of the signal to be measured divided by 1/TfThe latter integer part.
For the predetermined sequence E, for example, by combining a set of channel parametersp1And processing to obtain an estimation sequence as follows:
the estimation sequence is cross-correlated with the signal to be measured E, and the following formula can be adopted:
Alternatively, E in the above formula may be the signal to be measured compensated according to the phase change.
Alternatively, the cross-correlation of the M average signals with the plurality of estimated sequences may be performed
The process is carried out.
Obtained after hypothesis cross-correlationThe estimated sequence corresponding to the group of channel parameter combination has the highest cross-correlation degree with the signal to be measured, and the group of channel parameters is used for compensating the preset sequence to obtain a compensated sequence
Optionally, in this embodiment, parameters of the optical fiber link, such as a polarization rotation angle, polarization mode dispersion, a clock phase, a frequency offset, a baud rate, and the like, may also be determined according to the group of channel parameter combinations corresponding to the estimation sequence with the highest degree of cross-correlation with the signal to be measured, so as to obtain more information of the link. That is to say, can
The polarization rotation angle, polarization mode dispersion, clock phase, frequency offset, and baud rate in the set of parameters are used as the polarization rotation angle, polarization mode dispersion, clock phase, frequency offset, and baud rate of the link. And are not intended to be limiting herein.
Optionally, in some cases, there may be multiple sequences that can be selected, and before processing the preset sequences respectively by using multiple sets of different channel parameter combinations, one of the multiple sequences to be selected is further selected as the preset sequence.
In the specific implementation process, a plurality of sequences to be selected are obtained, the plurality of sequences to be selected are respectively subjected to cross-correlation with the signal to be detected, and the sequence to be selected with the highest cross-correlation degree with the signal to be detected is taken as the preset sequence.
The specific cross-correlation process can also be referred to the aforementioned equation 2, where Ep1The sequence to be selected may be replaced, and is not limited herein.
Fig. 5 is a schematic flow chart of a third embodiment of the method for acquiring an OSNR of a signal to be measured according to the signal to be measured and the compensated sequence, as shown in fig. 5, where the acquiring an OSNR of the signal to be measured according to the signal to be measured and the compensated sequence may include:
s501, performing an inner product operation on each frame of the signal to be measured and the compensated sequence to obtain an estimated signal-to-noise ratio (ESNR) of the signal to be measured.
It should be noted that, the signal to be measured may be sampled to obtain a vector α composed of sampling points of each frame, and then the conjugate value E of the compensated sequence is obtainedp2 *Find α and Ep2 *Inner product of (A) isThe inner product c may be:
wherein i may represent the ith sampling point of each frame of the signal to be measured, i is a positive integer greater than 0, and specifically, N inner product values are obtained for N frames of the signal to be measured, respectively, wherein the phase part of the inner product has uncertainty due to the existence of phase noise, α and Ep2 *The inner product result of (2) may be a complex number, preferably, the absolute value of the complex number is taken as the inner product result.
Optionally, ESNR ═ (mean)2Variance), where the mean (mean) is the mean of the N inner products determined by the pilot in the signal under test, and the variance is the variance of the N inner products determined by the magnitude of the random signal and noise in the signal under test.
S502, acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
After acquiring the ESNR, the OSNR of the signal to be measured may be acquired according to a pre-calibrated "preset relationship between the ESNR and the OSNR". For example, the preset relationship between the ESNR and the OSNR may be a mapping table, where the mapping relationship between the ESNR and the OSNR is listed in the mapping table, and after the ESNR is obtained through calculation, the OSNR is determined according to the mapping relationship between the ESNR and the OSNR.
Fig. 6 is a schematic structural diagram of a first embodiment of an osnr obtaining apparatus provided in the present invention, and as shown in fig. 6, the apparatus may include: the memory 601, the processor 602, and further, the interface unit 603 may also be included.
The memory 601, the processor 602, and the interface unit 603 may be coupled together by a bus 604, but are not limited thereto. The bus 604 may include a power bus, a control bus, a status signal bus, and the like, besides the data bus, and is collectively referred to as a bus in this embodiment.
The memory 601 is used for storing program instructions, and the processor 602 is used for calling the program instructions in the memory 601 to execute the above-mentioned method embodiments.
Specifically, the processor 602 is configured to process a preset sequence by using multiple groups of different channel parameter combinations, respectively, to obtain multiple estimation sequences, where the signal to be measured is a narrowband signal; performing cross correlation on the estimation sequences and a signal to be detected respectively, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected; compensating the preset sequence according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence; and acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
In this embodiment, a plurality of sets of different channel parameter combinations are used to process a preset sequence respectively to obtain a plurality of estimated sequences, the plurality of estimated sequences are cross-correlated with a signal to be detected respectively, an estimated sequence with the highest cross-correlation degree with the signal to be detected and a set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected are determined, the preset sequence is compensated according to the set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence, and the OSNR of the signal to be detected can be obtained according to the signal to be detected and the compensated sequence.
Optionally, the processor 602 is configured to perform cross-correlation on the multiple estimation sequences and the signal to be measured, specifically: averagely dividing the signals to be detected into M groups according to the period of the signals to be detected, wherein each group comprises NPA signal frame of which M, NPAre all positive integers greater than 0; for each group NPAveraging the signal frames to obtain M average signals; cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
Further, the processor 602 is further configured to perform autocorrelation on the signal to be detected, so as to obtain a period of the signal to be detected.
Optionally, the processor 602 is further configured to perform autocorrelation on the signal to be detected, and determine a phase change of the signal to be detected; and compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
Further, the processor 602 is configured to obtain an optical signal to noise ratio OSNR of the signal to be detected according to the signal to be detected and the compensated sequence, specifically: performing cross correlation on each frame of the signal to be detected and the compensated sequence to acquire an estimated signal-to-noise ratio (ESNR) of the signal to be detected; and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
Optionally, the processor 602 is further configured to obtain a plurality of sequences to be selected; and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
Optionally, the channel parameter combination comprises one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
The apparatus can be used in the method embodiment executed by the foregoing base station, and the implementation principle and technical effect thereof are similar, and related contents may refer to the method embodiment and are not described herein again.
Fig. 7 is a schematic structural diagram of a second embodiment of an osnr obtaining apparatus provided in the present invention, and as shown in fig. 7, the apparatus includes: an obtaining module 701, a determining module 702, a compensating module 703 and a processing module 704, wherein:
the obtaining module 701 is configured to use multiple groups of different channel parameter combinations to respectively process a preset sequence, and obtain multiple estimation sequences, where the signal to be measured is a narrowband signal.
A determining module 702, configured to perform cross-correlation on the multiple estimation sequences and a signal to be measured, respectively, and determine an estimation sequence with the highest degree of cross-correlation with the signal to be measured and a group of channel parameter combinations corresponding to the estimation sequence with the highest degree of cross-correlation with the signal to be measured.
A compensation module 703, configured to compensate the preset sequence according to the set of channel parameter combinations corresponding to the estimation sequence with the highest degree of cross-correlation with the signal to be detected, so as to obtain a compensated sequence.
And a processing module 704, configured to obtain an optical signal-to-noise ratio OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
In this embodiment, a plurality of sets of different channel parameter combinations are used to process a preset sequence respectively to obtain a plurality of estimated sequences, the plurality of estimated sequences are cross-correlated with a signal to be detected respectively, an estimated sequence with the highest cross-correlation degree with the signal to be detected and a set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected are determined, the preset sequence is compensated according to the set of channel parameter combination corresponding to the estimated sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence, and the OSNR of the signal to be detected can be obtained according to the signal to be detected and the compensated sequence.
Optionally, the determining module 702 is specifically configured to averagely divide the signal to be detected into M groups according to the period of the signal to be detected, where each group includes NPA signal frame of which M, NPAre all positive integers greater than 0; for each group NPAveraging the signal frames to obtain M average signals; cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
Fig. 8 is a schematic structural diagram of a third embodiment of an osnr obtaining apparatus provided in the present invention, as shown in fig. 8, on the basis of fig. 7, the apparatus further includes: and the autocorrelation module 801 is configured to perform autocorrelation on the signal to be detected to obtain a period of the signal to be detected.
Optionally, referring to fig. 8, in another embodiment, the method further includes: a phase compensation module 802;
the autocorrelation module 801 is further configured to perform autocorrelation on the signal to be detected, and determine a phase change of the signal to be detected. The phase compensation module 802 compensates the signal to be detected according to the phase change to obtain a compensated signal to be detected, where the pilot phases of each signal frame in the compensated signal to be detected are the same.
Further, the processing module 704 is specifically configured to perform cross-correlation on each frame of the signal to be detected and the compensated sequence, so as to obtain an ESNR of the signal to be detected; and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
Fig. 9 is a schematic structural diagram of a fourth embodiment of an osnr obtaining apparatus provided in the present invention, as shown in fig. 9, on the basis of fig. 7, the apparatus further includes: a selecting module 901, configured to obtain multiple sequences to be selected; and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
Further, the channel parameter combinations include one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
The apparatus can be used in the method embodiment executed by the foregoing base station, and the implementation principle and technical effect thereof are similar, and related contents may refer to the method embodiment and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. An optical signal-to-noise ratio acquisition method is characterized by comprising the following steps:
processing the preset sequence by adopting a plurality of groups of different channel parameter combinations respectively to obtain a plurality of estimation sequences;
respectively performing cross correlation on the plurality of estimation sequences and a signal to be detected, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected, wherein the signal to be detected is a narrow-band signal;
compensating the preset sequence according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence;
and acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
2. The method of claim 1, wherein cross-correlating the plurality of estimated sequences with the signal under test respectively comprises:
averagely dividing the signals to be detected into M groups according to the period of the signals to be detected, wherein each group comprises NPA signal frame of which M, NPAre all positive integers greater than 0;
for each group NPAveraging the signal frames to obtain M average signals;
cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
3. The method of claim 1, wherein before cross-correlating the plurality of estimated sequences with the signal under test, respectively, further comprising:
and carrying out autocorrelation on the signal to be detected to obtain the period of the signal to be detected.
4. The method according to claim 1, wherein before obtaining the OSNR of the signal under test according to the signal under test and the compensated sequence, the method further comprises:
performing autocorrelation on the signal to be detected, and determining the phase change of the signal to be detected;
and compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
5. The method according to claim 1, wherein the obtaining the OSNR of the signal to be measured according to the signal to be measured and the compensated sequence comprises:
performing cross correlation on each frame of the signal to be detected and the compensated sequence to acquire an estimated signal-to-noise ratio (ESNR) of the signal to be detected;
and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
6. The method of claim 1, wherein before the processing the preset sequence with the different channel parameter combinations to obtain the estimated sequences, the method further comprises:
acquiring a plurality of sequences to be selected;
and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
7. The method according to any of claims 1-6, wherein the channel parameter combinations comprise one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
8. An optical signal-to-noise ratio acquisition apparatus, comprising: a processor;
the processor is used for processing the preset sequence by adopting a plurality of groups of different channel parameter combinations respectively to obtain a plurality of estimation sequences;
respectively performing cross correlation on the plurality of estimation sequences and a signal to be detected, and determining an estimation sequence with the highest cross correlation degree with the signal to be detected and a group of channel parameter combinations corresponding to the estimation sequence with the highest cross correlation degree with the signal to be detected, wherein the signal to be detected is a narrow-band signal;
compensating the preset sequence according to the group of channel parameter combinations corresponding to the estimation sequence with the highest cross-correlation degree with the signal to be detected to obtain a compensated sequence;
and acquiring the OSNR of the signal to be detected according to the signal to be detected and the compensated sequence.
9. The apparatus of claim 8, wherein the processor is configured to cross-correlate the plurality of estimated sequences with a signal under test, respectively, specifically: averagely dividing the signals to be detected into M groups according to the period of the signals to be detected, wherein each group comprises NPA signal frame of which M, NPAre all positive integers greater than 0; for each group NPAveraging the signal frames to obtain M average signals; cross-correlating the M averaged signals with the plurality of estimated sequences, respectively.
10. The apparatus of claim 8, wherein the processor is further configured to perform autocorrelation on the signal under test to obtain a period of the signal under test.
11. The apparatus of claim 8, wherein the processor is further configured to auto-correlate the signal under test to determine a phase change of the signal under test; and compensating the signal to be detected according to the phase change to obtain a compensated signal to be detected, wherein the pilot frequency phase of each signal frame in the compensated signal to be detected is the same.
12. The apparatus according to claim 8, wherein the processor is configured to obtain an OSNR of the signal to be measured according to the signal to be measured and the compensated sequence, specifically: performing cross correlation on each frame of the signal to be detected and the compensated sequence to acquire an estimated signal-to-noise ratio (ESNR) of the signal to be detected; and acquiring the OSNR of the signal to be detected according to the ESNR and the preset relation between the ESNR and the OSNR.
13. The apparatus of claim 8, wherein the processor is further configured to obtain a plurality of sequences to be selected; and performing cross correlation on the plurality of sequences to be selected and the signal to be detected respectively, and taking the sequence to be selected with the highest cross correlation degree with the signal to be detected as the preset sequence.
14. The apparatus according to any of claims 8-13, wherein the channel parameter combinations comprise one or more of: polarization rotation angle, polarization mode dispersion, clock phase, and integer portion of frequency offset.
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| CN201610533353.7A CN107592156B (en) | 2016-07-07 | 2016-07-07 | Optical signal to noise ratio obtaining method and device |
| PCT/CN2017/073400 WO2018006598A1 (en) | 2016-07-07 | 2017-02-13 | Optical signal-to-noise ratio obtaining method and device |
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| CN102231644A (en) * | 2010-12-10 | 2011-11-02 | 华为技术有限公司 | Optical signal to noise ratio detection method and device |
| WO2014005613A1 (en) * | 2012-07-02 | 2014-01-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for configuring an optical path |
| CN104993866A (en) * | 2015-07-06 | 2015-10-21 | 华中科技大学 | Method and device for monitoring optical signal to noise ratio |
| CN105606910A (en) * | 2014-11-21 | 2016-05-25 | 中兴通讯股份有限公司 | Circuit, device and method of detecting optical signal to noise ratio |
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|---|---|---|---|---|
| CN102231644A (en) * | 2010-12-10 | 2011-11-02 | 华为技术有限公司 | Optical signal to noise ratio detection method and device |
| WO2014005613A1 (en) * | 2012-07-02 | 2014-01-09 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for configuring an optical path |
| CN105606910A (en) * | 2014-11-21 | 2016-05-25 | 中兴通讯股份有限公司 | Circuit, device and method of detecting optical signal to noise ratio |
| CN104993866A (en) * | 2015-07-06 | 2015-10-21 | 华中科技大学 | Method and device for monitoring optical signal to noise ratio |
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