CN106100741B - A kind of signal equalizing method and device - Google Patents
A kind of signal equalizing method and device Download PDFInfo
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- CN106100741B CN106100741B CN201610701837.8A CN201610701837A CN106100741B CN 106100741 B CN106100741 B CN 106100741B CN 201610701837 A CN201610701837 A CN 201610701837A CN 106100741 B CN106100741 B CN 106100741B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2581—Multimode transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6971—Arrangements for reducing noise and distortion using equalisation
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Abstract
The embodiment of the invention discloses a kind of signal equalizing method and devices, are applied to the receiving terminal of multicore multimode optical communication system, the method includes：For each fibre core, the first training sequence set is extracted from the signal received by the fibre core, wherein the first training sequence set includes at least one group of training sequence；From the pre-stored multigroup training sequence of the receiving terminal, the second training sequence set corresponding with the first training sequence set is determined；According to the second training sequence set and the first training sequence set, the transmission matrix for the fibre core is determined；The signal is carried out according to the transmission matrix balanced；According to the signal received by all fibre cores core matrix is determined using resampling technique；Equilibrium is carried out again to the signal after all equilibriums according to the core matrix.Using the embodiment of the present invention, the operand during signal equalization is reduced, equalization efficiency is improved.
Description
Technical field
The present invention relates to technical field of optical fiber communication, more particularly to a kind of signal equalizing method and device.
Background technology
In order to meet growing capacity requirement, more and more passes are received based on multicore multimode fiber transmission system
Note.Multicore multimode fibre is in common clad region there is multiple fibre cores, multiple fibres of the optical signal in same root optical fiber
It is transmitted in core, physically realizes multiplexing, moreover, each fibre core can transmit multiple patterns, each pattern can
Using as independent transmission channel.Multicore multimode fibre has been utilized respectively multiple patterns and multiple used physical transmission channels realize space division
Multiplexing, greatly improves the efficiency of transmission of system.For multiple patterns in same fibre core, each mode propagation velocities are each
Differ, accordingly, there exist serious intermode dispersions, and pattern is more, and intermode dispersion is more serious, cause different mode signal it
Between mode-coupling resonat occurs.For multiple fibre cores in common clad region, there is also coupled between core between fibre core.Mode-coupling resonat
The collective effect coupled between core results in the distortion for the signal that receiving terminal in optical communication system receives, wherein mode-coupling resonat again
It is the main reason for leading to signal distortion.
In order to enable signal is accurately restored, need to carry out received signal effective balanced.In the prior art,
It is effective balanced in order to be realized to received signal, using being inserted into training sequence, receiving terminal in the signal of each pattern
The transmission matrix of optical fiber is determined according to the training sequence being previously stored and the training sequence extracted from the signal received,
Receiving terminal is carried out at the same time the equilibrium coupled between mode-coupling resonat and core according to this transmission matrix to all mode signals received.
Under normal conditions, the transmission matrix of above-mentioned determination is larger, larger using matrix progress signal equalization hour operation quantity,
Equalization efficiency is relatively low.
Invention content
The embodiment of the present invention is designed to provide a kind of signal equalizing method and device, to improve signal equalization efficiency.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of signal equalizing methods, and it is logical to be applied to multicore multimode light
The receiving terminal of letter system, the method includes：
For each fibre core, the first training sequence set is extracted from the signal received by the fibre core, wherein institute
It states the first training sequence set and includes at least one group of training sequence；
From the pre-stored multigroup training sequence of the receiving terminal, determine and the first training sequence set corresponding second
Training sequence set；
According to the second training sequence set and the first training sequence set, the transmission for the fibre core is determined
Matrix；
The signal is carried out according to the transmission matrix balanced；
According to the signal received by all fibre cores core matrix is determined using resampling technique；
Equilibrium is carried out again to the signal after all equilibriums according to the core matrix.
Preferably, described be directed to each fibre core, the first training sequence is extracted from the signal received by the fibre core
Set, including：
According to the signal that the fibre core receives, the mode-coupling resonat degree of the fibre core is determined；
In the case where the mode-coupling resonat degree is less than predetermined threshold value, using preset function, one is extracted from the signal
Group training sequence is as the first training sequence set；
In the case where the mode-coupling resonat degree is not less than predetermined threshold value, using the preset function, from the signal
At least two groups training sequence is extracted as the first training sequence set.
Preferably, the signal received according to the fibre core, determines the mode-coupling resonat degree of the fibre core, including：
One group of training sequence is extracted from the signal, and the first mould for the fibre core is determined according to the training sequence
Between matrix；
From the pre-stored multigroup training sequence of the receiving terminal, trained sequence corresponding with the training sequence is determined
Row；
According to identified training sequence, the second intermode matrix for the fibre core is determined；
Calculate the quotient of the second intermode matrix and the first intermode matrix；
According to the quotient, the mode-coupling resonat degree of the fibre core is determined.
Preferably, the preset function is window function.
Preferably, the second intermode matrix is orthogonal matrix.
To achieve the above object, the embodiment of the present invention additionally provides a kind of signal equalization device, is applied to multicore multimode light
The receiving terminal of communication system, described device include：Extraction module, the first determining module, the second determining module, the first equilibrium model
Block, third determining module and the second balance module, wherein
The extraction module extracts the first instruction for being directed to each fibre core from the signal received by the fibre core
Practice arrangement set, wherein the first training sequence set includes at least one group of training sequence；
First determining module, for from the pre-stored multigroup training sequence of the receiving terminal, determining and first
The corresponding second training sequence set of training sequence set；
Second determining module is used for according to the second training sequence set and the first training sequence set,
Determine the transmission matrix for the fibre core；
First balance module, it is balanced for being carried out to the signal according to the transmission matrix；
The third determining module, for being determined using resampling technique according to the signal received by all fibre cores
Core matrix；
Second balance module, for carrying out equilibrium again to the signal after all equilibriums according to the core matrix.
Preferably, the extraction module includes：Determination sub-module, the first extracting sub-module and the second extracting sub-module,
In,
The determination sub-module, the signal for being received according to the fibre core determine the mode-coupling resonat degree of the fibre core；
First extracting sub-module, in the case where the mode-coupling resonat degree is less than predetermined threshold value, using default
Function extracts one group of training sequence as the first training sequence set from the signal；
Second extracting sub-module, in the case where the mode-coupling resonat degree is not less than predetermined threshold value, utilizing institute
Preset function is stated, at least two groups training sequence is extracted from the signal as the first training sequence set.
Preferably, the determination sub-module, is specifically used for：
One group of training sequence is extracted from the signal, and the first mould for the fibre core is determined according to the training sequence
Between matrix；
From the pre-stored multigroup training sequence of the receiving terminal, trained sequence corresponding with the training sequence is determined
Row；
According to identified training sequence, the second intermode matrix for the fibre core is determined；
Calculate the quotient of the second intermode matrix and the first intermode matrix；
According to the quotient, the mode-coupling resonat degree of the fibre core is determined.
Preferably, the preset function is window function.
Preferably, the second intermode matrix is orthogonal matrix.
An embodiment of the present invention provides a kind of signal equalizing method and devices, applied to connecing for multicore multimode optical communication system
Receiving end, the method includes：For each fibre core, the first training sequence collection is extracted from the signal received by the fibre core
It closes, wherein the first training sequence set includes at least one group of training sequence；From the pre-stored multigroup instruction of the receiving terminal
Practice in sequence, determines the second training sequence set corresponding with the first training sequence set；According to the second training sequence collection
It closes and the first training sequence set, the determining transmission matrix for the fibre core；According to the transmission matrix to the letter
It number carries out balanced；According to the signal received by all fibre cores core matrix is determined using resampling technique；According to the core
Matrix carries out equilibrium again to the signal after all equilibriums.
Using the embodiment of the present invention, the signal in each fibre core is carried out respectively using multiple smaller transmission matrixs equal
Weighing apparatus recycles core matrix to carry out balanced again, reduces the matrix operation amount during signal equalization, improve equalization efficiency.
Certainly, it implements any of the products of the present invention or method must be not necessarily required to reach all the above excellent simultaneously
Point.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of signal equalizing method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of signal equalization device provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
To solve prior art problem, an embodiment of the present invention provides a kind of signal equalizing method and devices, first below
A kind of signal equalizing method provided in an embodiment of the present invention is described in detail.
It should be noted that the embodiment of the present invention is applied to the receiving terminal of multicore multimode optical communication system.
Fig. 1 is a kind of flow diagram of signal equalizing method provided in an embodiment of the present invention, may include：
S101：For each fibre core, the first training sequence set is extracted from the signal received by the fibre core,
In, the first training sequence set includes at least one group of training sequence.
Specifically, being directed to each fibre core, the first training sequence set is extracted from the signal received by the fibre core,
The signal that can be received according to the fibre core determines the mode-coupling resonat degree of the fibre core；It is less than in the mode-coupling resonat degree pre-
If in the case of threshold value, using preset function, one group of training sequence is extracted from the signal as the first training sequence set；
In the case where the mode-coupling resonat degree is not less than predetermined threshold value, using the preset function, extracted at least from the signal
Two groups of training sequences are as the first training sequence set.
In order to improve the quality of signal equalization, signal equalization is carried out generally according to multigroup training sequence, using of the invention real
Example is applied, in the case where core mode coupling is less than predetermined threshold value, signal equalization is carried out according to one group of training sequence, reduces letter
Matrix operation amount in number balancing procedure, improves equalization efficiency.
Specifically, according to the signal that the fibre core receives, the mode-coupling resonat degree of the fibre core is determined, it can be from the letter
One group of training sequence is extracted in number, and the first intermode matrix for the fibre core is determined according to the training sequence；It is connect from described
In the pre-stored multigroup training sequence of receiving end, training sequence corresponding with the training sequence is determined；According to identified instruction
Practice sequence, determines the second intermode matrix for the fibre core；Calculate the second intermode matrix and the first intermode matrix
Quotient；According to the quotient, the mode-coupling resonat degree of the fibre core is determined.
In practical applications, preset function can be window function, and the second intermode matrix can be orthogonal matrix.
Assuming that receiving terminal prestores two groups of training sequences, one of which training sequence is A1i、A2i、A3i, another group of training
Sequence is A1j、A2j、A3j。
Illustratively, it is illustrated by taking three cores, three mode fiber as an example below.
Assuming that the fibre core of three cores, three mode fiber is respectively core one, core two, core three.Below with from the letter received by core one
Extraction training set is combined into example and illustrates in number.
Pass through the signal that the signal that core one receives is three patterns, wherein include two groups in the signal that fibre core receives
Training sequence and training sequence for establishing core matrix.In practical applications, can include more in the signal that fibre core receives
Multigroup training sequence.
It is assumed that being H according to the one group of training sequence extracted in the signal received by core one11A1i、H12A2i、
H13A3i、H21A1i、H22A2i、H23A3i、H31A1i、H32A2iAnd H33A3i。
The the first training sequence collection then determined is combined into { H11A1i、H12A2i、H13A3i、H21A1i、H22A2i、H23A3i、H31A1i、
H32A2i、H33A3i}。
The first intermode matrix corresponding with the first training sequence set isWherein,
Every a line of first intermode matrix corresponds to a mode signal in core one.
According to the one group of training sequence extracted in core one, one group of training sequence corresponding with group training is A1i、
A2i、A3i。
The the second training sequence collection then determined is combined into { A1i、A2i、A3i}。
The second intermode matrix corresponding with the second training sequence set is
In practical applications, can also the second intermode matrix be determined using another group of training sequence.
In addition, in order to ensure receiving terminal can correct received training sequence, be inserted into training sequence in each fibre core it
Between be orthogonal, and then according to receiving terminal storage training sequence determine the second intermode matrix be orthogonal matrix.
According to the first intermode matrix S and the second intermode matrix T, the quotient H of the second intermode matrix and the first intermode matrix is calculated.
Specifically, according to S=H*T, it is known that,
S*T-1=H*T*T-1=H
Wherein, T-1For the inversion matrix of the second intermode matrix T.
According to H, the mode-coupling resonat degree for each fibre core is determined.Determine that the Mode Coupling degree of signal in fibre core is existing skill
Art, the embodiment of the present invention is herein without repeating.
It is assumed that predetermined threshold value is 0.4, the mode-coupling resonat degree for the core one determined is 0.3.
Window function, receiving terminal is then utilized to extract one group of training sequence from the signal received using core one as the first instruction
Practice arrangement set, it is assumed that one group of training sequence of extraction is H11A1i、H12A2i、H13A3i、H21A1i、H22A2i、H23A3i、H31A1i、
H32A2iAnd H33A3i。
The the first training sequence collection for being then directed to core one is combined into { H11A1i、H12A2i、H13A3i、H21A1i、H22A2i、H23A3i、
H31A1i、H32A2i、H33A3i}。
The first intermode matrix corresponding with the first training sequence set is
Assuming that predetermined threshold value is 0.2, then window function, receiving terminal is utilized to be extracted at least from the signal received using core one
Two groups of training sequences, at least two groups training sequence is cascaded, and the training sequence after cascade obtains the first training sequence after block converts
Row collection is combined into { H11A1ij、H12A2ij、H13A3ij、H21A1ij、H22A2ij、H23A3ij、H31A1ij、H32A2ij、H33A3ij}。
The first intermode matrix corresponding with the first training sequence set is
S102：From the pre-stored multigroup training sequence of the receiving terminal, determination is corresponding with the first training sequence set
The second training sequence set.
In the case where Mode Coupling degree is less than predetermined threshold value, the second training sequence collection determined is combined into { A1i、A2i、
A3i, the second intermode matrix corresponding with the second training sequence set is
In the case where Mode Coupling degree is not less than predetermined threshold value, the second training sequence collection determined is combined into { A1i、A2i、
A3i、A1j、A2j、A3j, the corresponding at least two groups training sequence of the second training sequence set is cascaded, the training sequence warp after cascade
Obtained the second intermode matrix is after block transformation
Wherein, the corresponding at least two groups training sequence of the second training sequence is cascaded, the training sequence after cascade becomes through block
The process changed is as follows：
The corresponding two groups of training sequences of second training sequence set areWith
It is by the matrix after the cascade of two groups of training sequences
Concatenation matrix is converted into row block：
It enables, Anij=[Ani 0 0 Anj]
The second determining intermode matrix isWherein the second intermode matrix is orthogonal matrix.
S103：According to the second training sequence set and the first training sequence set, determines and be directed to the fibre core
Transmission matrix.
Specifically, assuming that transmission matrix is H ', H '=SIt is small*T-1Or
S104：The signal is carried out according to the transmission matrix balanced.
Specifically, carrying out balanced being the prior art to receiving terminal received signal according to transmission matrix H ', the present invention is implemented
Example does not repeat it herein.
S105：According to the signal received by all fibre cores core matrix is determined using resampling technique.
Specifically, according to receiving terminal received signal, using resampling technique, determine that core matrix is the prior art, this hair
Bright embodiment does not repeat it herein.
Assuming that the core matrix determined is
S106：Equilibrium is carried out again to the signal after all equilibriums according to the core matrix.
Specifically, according to core matrixEquilibrium is carried out again to the signal after S104 step equilibriums,
Wherein, signal is carried out balanced being the prior art using core matrix, the embodiment of the present invention does not repeat it herein.
By taking three cores, three mode fiber as an example.In the prior art, receiving terminal determines the transmission of a 9*9 according to the signal received
Matrix carries out the signal received balanced.In embodiments of the present invention, first with the transmission matrix of a 3*3 to by each
The signal of fibre core carries out equilibrium, recycles the core matrix of a 3*3 to carry out the signal by the optical fiber balanced.Reduce signal
Operand in balancing procedure.
It should be noted that above-mentioned illustrate by taking three cores, three mode fiber as an example, an only specific example of the invention, and
Do not constitute limitation of the invention.
Using the embodiment of the present invention, the matrix operation amount during signal equalization is reduced, improves balanced efficiency.
Corresponding with above method embodiment, the embodiment of the present invention additionally provides a kind of signal equalization device, is applied to more
The receiving terminal of core multimode optical communication system.
Fig. 2 is a kind of signal equalization apparatus structure schematic diagram provided in an embodiment of the present invention, may include：Extraction module
201, the first determining module 202, the second determining module 203, the first balance module 204, third determining module 205 and second are balanced
Module 206, wherein
Extraction module 201 extracts the first training for being directed to each fibre core from the signal received by the fibre core
Arrangement set, wherein the first training sequence set includes at least one group of training sequence.
Specifically, the extraction module 201 of the embodiment of the present invention is carried including determination sub-module, the first extracting sub-module and second
Take submodule (not shown), wherein
Determination sub-module, the signal for being received according to the fibre core determine the mode-coupling resonat degree of the fibre core.
First extracting sub-module, in the case where the mode-coupling resonat degree is less than predetermined threshold value, using preset function,
One group of training sequence is extracted from the signal as the first training sequence set.
Second extracting sub-module, in the case where the mode-coupling resonat degree is not less than predetermined threshold value, using described pre-
If function, at least two groups training sequence is extracted from the signal as the first training sequence set.
Specifically, determination sub-module specifically can be used for：One group of training sequence is extracted from the signal, according to the instruction
Practice sequence and determines the first intermode matrix for being directed to the fibre core；From the pre-stored multigroup training sequence of the receiving terminal, really
Fixed training sequence corresponding with the training sequence；According to identified training sequence, the second mould for the fibre core is determined
Between matrix；Calculate the quotient of the second intermode matrix and the first intermode matrix；According to the quotient, the mould of the fibre core is determined
Between the degree of coupling.
In practical applications, the preset function can be window function；The second intermode matrix is orthogonal matrix.
First determining module 202, for from the pre-stored multigroup training sequence of the receiving terminal, determining and the first instruction
Practice the corresponding second training sequence set of arrangement set.
Second determining module 203 is used for according to the second training sequence set and the first training sequence set, really
Surely it is directed to the transmission matrix of the fibre core.
First balance module 204, it is balanced for being carried out to the signal according to the transmission matrix.
Third determining module 205, for being determined using resampling technique according to the signal received by all fibre cores
Core matrix.
Second balance module 206, for carrying out equilibrium again to the signal after all equilibriums according to the core matrix.
Using the embodiment of the present invention, the matrix operation amount during signal equalization is reduced, improves balanced efficiency.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so description is fairly simple, related place is referring to embodiment of the method
Part explanation.
One of ordinary skill in the art will appreciate that all or part of step in realization above method embodiment is can
It is completed with instructing relevant hardware by program, the program can be stored in computer read/write memory medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disc, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of signal equalizing method is applied to the receiving terminal of multicore multimode optical communication system, which is characterized in that the method packet
It includes：
For each fibre core, the first training sequence set is extracted from the signal received by each fibre core, wherein institute
It states the first training sequence set and includes at least one group of training sequence；
From the pre-stored multigroup training sequence of the receiving terminal, the second training corresponding with the first training sequence set is determined
Arrangement set；
According to the second training sequence set and the first training sequence set, the transmission square for the fibre core is determined
Battle array；
The signal is carried out according to the transmission matrix balanced；
According to the signal received by all fibre cores core matrix is determined using resampling technique；
Equilibrium is carried out again to the signal after all equilibriums according to the core matrix.
2. according to the method described in claim 1, it is characterized in that, it is described be directed to each fibre core, received from by the fibre core
To signal in extract the first training sequence set, including：
According to the signal that the fibre core receives, the mode-coupling resonat degree of the fibre core is determined；
In the case where the mode-coupling resonat degree is less than predetermined threshold value, using preset function, one group of instruction is extracted from the signal
Practice sequence as the first training sequence set；
In the case where the mode-coupling resonat degree is not less than predetermined threshold value, using the preset function, extracted from the signal
At least two groups training sequence is as the first training sequence set.
3. according to the method described in claim 2, it is characterized in that, the signal received according to the fibre core, determines institute
The mode-coupling resonat degree of fibre core is stated, including：
One group of training sequence is extracted from the signal, and the first intermode square for the fibre core is determined according to the training sequence
Battle array；
From the pre-stored multigroup training sequence of the receiving terminal, training sequence corresponding with the training sequence is determined；
According to identified training sequence, the second intermode matrix for the fibre core is determined；
Calculate the quotient of the second intermode matrix and the first intermode matrix；
According to the quotient, the mode-coupling resonat degree of the fibre core is determined.
4. according to the method described in claim 2, it is characterized in that, the preset function is window function.
5. according to the method described in claim 3, it is characterized in that, the second intermode matrix is orthogonal matrix.
6. a kind of signal equalization device is applied to the receiving terminal of multicore multimode optical communication system, which is characterized in that described device packet
It includes：Extraction module, the first determining module, the second determining module, the first balance module, third determining module and the second equilibrium model
Block, wherein
The extraction module extracts the first instruction for being directed to each fibre core from the signal received by each fibre core
Practice arrangement set, wherein the first training sequence set includes at least one group of training sequence；
First determining module, for from the pre-stored multigroup training sequence of the receiving terminal, determining and the first training
The corresponding second training sequence set of arrangement set；
Second determining module, for according to the second training sequence set and the first training sequence set, determining
For the transmission matrix of the fibre core；
First balance module, it is balanced for being carried out to the signal according to the transmission matrix；
The third determining module, for determining core square using resampling technique according to the signal received by all fibre cores
Battle array；
Second balance module, for carrying out equilibrium again to the signal after all equilibriums according to the core matrix.
7. device according to claim 6, which is characterized in that the extraction module includes：Determination sub-module, the first extraction
Submodule and the second extracting sub-module, wherein
The determination sub-module, the signal for being received according to the fibre core determine the mode-coupling resonat degree of the fibre core；
First extracting sub-module, in the case where the mode-coupling resonat degree is less than predetermined threshold value, using preset function,
One group of training sequence is extracted from the signal as the first training sequence set；
Second extracting sub-module, in the case where the mode-coupling resonat degree is not less than predetermined threshold value, using described pre-
If function, at least two groups training sequence is extracted from the signal as the first training sequence set.
8. device according to claim 7, which is characterized in that the determination sub-module is specifically used for：
One group of training sequence is extracted from the signal, and the first intermode square for the fibre core is determined according to the training sequence
Battle array；
From the pre-stored multigroup training sequence of the receiving terminal, training sequence corresponding with the training sequence is determined；
According to identified training sequence, the second intermode matrix for the fibre core is determined；
Calculate the quotient of the second intermode matrix and the first intermode matrix；
According to the quotient, the mode-coupling resonat degree of the fibre core is determined.
9. device according to claim 7, which is characterized in that the preset function is window function.
10. device according to claim 8, which is characterized in that the second intermode matrix is orthogonal matrix.
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