CN104756456A

CN104756456A - Method and apparatus for recognizing modulation format of quadrature modulation signal

Info

Publication number: CN104756456A
Application number: CN201380001432.8A
Authority: CN
Inventors: 刘洁; 罗雅枝; 刘伯涛; 吕超; 卢彦兆
Original assignee: Huawei Technologies Co Ltd; Hong Kong Polytechnic University HKPU
Current assignee: Huawei Technologies Co Ltd; Hong Kong Polytechnic University HKPU
Priority date: 2013-10-24
Filing date: 2013-10-24
Publication date: 2015-07-01
Anticipated expiration: 2033-10-24
Also published as: CN104756456B; WO2015058385A1

Abstract

Disclosed are a method and apparatus for recognizing the modulation format of a quadrature modulation signal, aiming to solve the problem in the prior art that there is a lower accuracy in recognizing the modulation format of signals. The normalized powers of a plurality of symbols in a symbol sequence of a received quadrature modulation signal are determined, the probabilities that the normalized powers of the symbols fall within each preset power range are determined to thereby determine a power distribution characteristic value of the quadrature modulation signal, and the modulation format of the quadrature modulation signal is determined according to the result of comparison between the determined power distribution characteristic value and a plurality of preset threshold values. The method described above can avoid the influence of frequency offset and phase noise on the result of recognition, and can effectively improve the accuracy in recognizing the modulation format of signals when applied to those systems with relatively larger frequency offset and phase noise, such as EON (Elastic Optical Network).

Description

Method and apparatus for recognizing modulation format of quadrature modulation signal

A kind of method and device technical field for the modulation format for recognizing orthogonal demodulation signal

The present invention relates to communication technical field, the method and device of espespecially a kind of modulation format for recognizing orthogonal demodulation signal.Background technology

With the continuous growth of network bandwidth requirements, the elastic optical network distributed based on flexible bandwidth（Elastic Optical Network, EON) cause increasing concern due to existing network transmission capacity can be made full use of.

Due in EON, it is necessary to for different modulating form signal distribute its transmission frequency spectrum and bandwidth, therefore, the modulation format for being accomplished by the signal to receiving as the coherent receiver of receiving side signal is identified.

At present, the method for the modulation format of identification orthogonal demodulation signal is usually：Non-Gaussian signal is analyzed in Higher Order Cumulants and high-order spectral domain, the higher order cumulants measure feature of modulated signal is obtained, is identified according to the modulation format that higher order cumulants measure feature exchanges signal processed.The principle of this recognition methods is：White Gaussian noise is different from the Higher Order Cumulants and high order frequency spectrum of orthogonal demodulation signal, the feature of the Higher Order Cumulants of the orthogonal demodulation signal of different modulating form is also different, i.e., the cumulant and frequency spectrum more than second order of white Gaussian noise are 0, and the Higher Order Cumulants and higher-order spectrum of orthogonal demodulation signal are not 0, therefore, can by Higher Order Cumulants and high order frequency spectrum analyze non-Gaussian signal Higher Order Cumulants, determine the higher order cumulants measure feature of orthogonal demodulation signal, the modulation format of orthogonal demodulation signal is determined according to this feature, avoid being influenceed by white Gaussian noise when recognizing modulation format, to improve the accuracy of identification,.

But, the above-mentioned method according to Higher Order Cumulants feature recognition modulation format is to local oscillator in coherent receiver（Local oscillator) with receive signal phase and frequency synchronism require it is higher, and the receiver in EON is the light coherent receiver with larger frequency deviation and phase noise, therefore the accuracy using the modulation format of above method identification signal in EON is relatively low. The content of the invention

The embodiment of the present invention provides a kind of method and device for the modulation format for recognizing orthogonal demodulation signal, to solve recognizing the problem of accuracy of modulation format of signal is relatively low in the environment of with larger frequency deviation and phase noise in the prior art.

First aspect there is provided it is a kind of recognize orthogonal demodulation signal modulation format method, including：Power normalization processing is carried out to the symbol sebolic addressing of the orthogonal demodulation signal of reception, the respective normalized power of multiple symbols that symbol sebolic addressing is included is obtained；

According to the normalized power of the multiple symbol of determination, determine that the normalized power of the multiple symbol falls the probability in default multiple power brackets, wherein, default multiple power brackets are according to the multiple reference modulation format settings being pre-selected；

Fall the ratio of the probability in the multiple power bracket according to the normalized power of the multiple symbol, determine the power distribution characteristic value of the orthogonal demodulation signal；

The power distribution characteristic value of determination and default multiple threshold values are compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

With reference in a first aspect, in the first possible implementation, carrying out power normalization processing to the symbol sebolic addressing of the orthogonal demodulation signal of reception, obtaining the respective normalized power of multiple symbols that symbol sebolic addressing is included, specifically include：

According to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, the power average value of the multiple symbol is determined；

For each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

With reference to the first possible implementation of first aspect or first aspect, in second of possible implementation, the modulation format of the orthogonal demodulation signal is one kind in QPSK QPSK forms, 16 quadrature amplitude modulation QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

With reference to second of possible implementation, in the third possible implementation, multiple power brackets are preset, are specifically included： Multiple reference modulation forms are selected in advance in each modulation format, and the alternative scope of multiple power is preset according to each reference modulation form of selection；

According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power；

According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR；

According to default any alternative scope of power under the reference modulation format condition, it is determined that meeting formula df/du_thU when=0_thAs the power threshold determined in the alternative scope of the power, wherein, f=∑ [Ρ (Ε₄ ) f ^+∞ w₄ (u)du] + [ pCEj ) ί^¾ _Wj(u) du)], for i-th of benchmark normalized power for being less than minimum value in the alternative scope of the power of determination, the probability for the symbol that p (Ei) is ^ for emergent power in the ideally reference modulation form, Ε " is j-th of the benchmark normalized power for being more than maximum in the alternative scope of the power determined, and p (Ej) is emergent power in the ideally reference modulation form

, σ²For the noise work(under the conditions of the default OSNR

Rate, 1.（）For first kind modified Bessel function,_Wl(u) to be less than probability distribution of i-th of the benchmark normalized power of minimum value in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination,_Wj(u) to be more than probability distribution of j-th of benchmark normalized power under the conditions of the default OSNR of maximum in the alternative scope of the power in the reference modulation form that determines；

According to each power threshold predetermined power scope of determination.

With reference to the third possible implementation, in the 4th kind of possible implementation, when the reference modulation form being pre-selected is 16QAM forms, the default alternative scope of power is（0.2,1.0) and（1.0, 1.8 ); When the reference modulation form being pre-selected is 256QAM forms, the default alternative scope of power is (1.8,2.0) and (2.1,2.3);

When the reference modulation form being pre-selected be 32QAM forms when, the default alternative scope of power be (0.1,0.5),（0.5,0.9) and（0.9, 1.3);

When the reference modulation form being pre-selected be 64QAM forms when, the default alternative scope of power be (0.8,1.2),（) and (1.2,1.4) 0.6,0.8.

With reference to the 4th kind of possible implementation, in the 5th kind of possible implementation, according to each power threshold predetermined power scope of determination, specifically include：

, will be in the alternative scope of power when the reference modulation form being pre-selected is 16QAM forms（0.2,1.0 the power threshold determined in) is as the first critical value ^l, by the alternative scope of power（0.2,1.0 the power threshold determined in) as the second critical value Pth2, predetermined power scope be [PtM tM], (- oo, t), (t/2,+oo);

, will be in the alternative scope of power when the reference modulation form being pre-selected is 256QAM forms（1.8,2.0) power threshold determined in regard the power threshold determined in the alternative scope of power (2.1,2.3) as the 4th critical value Ρ Μ as three critical values/^ 3, predetermined power scope for [PtM ,+oo), Pth PtM)；

, will be in the alternative scope of power when the reference modulation form being pre-selected is 32QAM forms（0.1,0.5 the power threshold determined in) is as the 5th critical value by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value ^6, by the alternative scope of power（0.9,1.3 the power threshold determined in) is used as the 7th critical value Pt/7, predetermined power scope be [^5, ^6], (~ ο ο, (Pth6, Pthiy,

, will be in the alternative scope of power when the reference modulation form being pre-selected is 64QAM forms（0.8,1.2 the power threshold determined in) is less than Pth9 as the 8th critical value 7^8 and the 9th critical value 7^8, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as ten critical values/^ 10, by the alternative scope of power（1.2,1.4 the power threshold determined in) is as 11 critical values/^11, and predetermined power scope is | t/z8, Pth9], [Pthl 0, Pthl 1]. With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, the power distribution characteristic value of the orthogonal demodulation signal is determined, is specifically included：

Using formula RatM=^ P ([Pth Pth2 }) _ determine the orthogonal demodulation signal relative to benchmark

>((- ∞, Pth (Pth2, + ∞)) modulation format 16QAM the first power distribution characteristic value Ratol, wherein, Ρ ([Α Μ, Ρ 2]) fall the probability in [PtM, Pth2] for the normalized power of symbol in the orthogonal demodulation signal

P((-oo, PMl (Pth2, 》Normalized power for symbol in the orthogonal demodulation signal falls（Pthl] or CPt/ ,+ο ο) in probability；Using formula Ratiol=^Ρ([,+° °》Determine the orthogonal demodulation signal relative to reference modulation lattice

P ([Pth3, Pth4)) formula 256QAM the second power distribution characteristic value Rato2, wherein, P ([PtM, + oo)) fall for the normalized power of symbol in the orthogonal demodulation signal in [PtM, + oo) in probability, P ([^3, PtM》For symbol in the orthogonal demodulation signal normalized power fall [Α/β, Α Μ) in probability；

Determine the orthogonal demodulation signal relative to base using formula Ratio3=--- P ([Pth5, Pth6]) ---

P ((- oo, Pth5) Pth6, Pthl }) quasi- modulation format 32QAM the 3rd power distribution characteristic value Ratio3, wherein, P ([Pth5, Pth6]) be that the normalized power of symbol in the orthogonal demodulation signal falls the probability in [Pt/z5, ^6], pu) it is that the normalized power of symbol in the orthogonal demodulation signal falls（- ο ο, Ρ 5) in probability, P (^Pth6, Pt) is that the normalized power of symbol falls in 0 Ρ 6, Ρ 7 in the orthogonal demodulation signal] in probability；

Using formula Rati.4=determine the orthogonal demodulation signal relative to reference modulation

P ([Pth 0, Pth 1]) form 64QAM the 4th power distribution characteristic value Rat, wherein, P ([^8, ^9]) is that the normalized power of symbol in the orthogonal demodulation signal falls in [^₈, ^9] in probability, Ρ ([Α Μ 0, Α Μ 1]) be the orthogonal demodulation signal in symbol normalized power fall thlO, Pthl 1] in probability.

With reference to the 6th kind of possible implementation, in the 7th kind of possible implementation, multiple threshold values are preset, are specifically included：The the first threshold value tM for making ^ te ^^ value maximum is preset, wherein： P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；

P (B (thl) | B) it is that, when known B signal is not the signal of QPSK forms, the Ratiol of B signal is less than thl probability；

It is default to make P (dimensions²) |A)₂₊The second maximum threshold value of P Array value_th2, wherein：

P (A (th2) | A) is the 4 both rates of the Ratio2 of a-signal not less than th2 when known a-signal is 256QAM forms or the signal of 64QAM forms and the Ratiol of A signals is less than thl；

P (B (th2) | B) it is that the Ratio2 of B signal is less than th2 probability when known B signal is 32QAM forms or the signal of 128QAM forms or 16QAM forms and the Ratiol of B signal is less than thl；

The 3rd maximum threshold value of the default value for making P (A (th3) | A) ÷ P (B (th3) B), wherein：

P (A (th3) |) is that the Ratio4 of a-signal is not less than th3 probability when the signal and the Ratiol of a-signal that known a-signal is 256QAM forms are less than thl, the Ratio2 of a-signal is not less than th2；

P (B (th3) | B) it is that the Ratio4 of B signal is less than th3 probability when the signal and the Ratiol of B signal that known B signal is 64QAM forms are less than thl, the Ratio2 of B signal is not less than th2；

It is default to make P (^4) | A)₂₊The 4th maximum threshold value of P (B (th4) B) value_tM, wherein：

P (A (th4) | A) it is that the Ratio3 of a-signal is not less than th4 probability when known a-signal is 32QAM forms or the signal of 128QAM forms and the Ratiol of A signals is less than thl, the Ratio2 of a-signal is less than th2；

P (B (th4) | B) it is that the Ratio3 of B signal is less than th4 probability when the signal and the Ratiol of B signal that known B signal is 16QAM forms are less than thl, the Ratio2 of B signal is less than th2；

The 5th maximum threshold value of the default value for making P (A (th5) | A) ÷ P (B (th5) B)_th5, wherein：

P (A (th5) | A) it is the Ratio3 of a-signal when the signal and the Ratiol of a-signal that known a-signal is 32QAM forms are less than thl, the Ratio2 of a-signal is less than th2, the Ratio3 of a-signal is not less than th4 Probability not less than th5；

P (B (th5) | B) it is that the Ratio3 of B signal is less than th5 probability when the signal and the Ratiol of B signal that known B signal is 128QAM forms are less than thl, the Ratio2 of B signal is less than th2, the Ratio3 of B signal is not less than th4.

With reference to the 7th kind of possible implementation, in the 8th kind of possible implementation, the power distribution characteristic value of determination and default multiple threshold values are compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result, is specifically included：

When the Ratiol is not less than thl, the modulation format for determining the orthogonal demodulation signal is QPSK forms；

When the Ratiol is less than thl and 110 2 are not less than th3 not less than 1112 and Ratio 4, the modulation format for determining the orthogonal demodulation signal is 256QAM forms；

When the Ratiol is less than thl and 110 2 are less than th3 not less than 1112 and Ratio 4, the modulation format for determining the orthogonal demodulation signal is 64QAM forms；

It is less than th2 and when Ratio3 is not less than th5 not less than th4 and Ratio3 when the Ratiol is less than thl and Ratio2, the modulation format for determining the orthogonal demodulation signal is 32QAM forms；

It is less than th2 and when Ratio3 is less than th5 not less than th4 and Ratio3 when the Ratiol is less than thl and Ratio2, the modulation format for determining the orthogonal demodulation signal is 128QAM forms；

It is less than th2 and when Ratio 3 is less than th4 when the Ratiol is less than thl and Ratio 2, the modulation format for determining the orthogonal demodulation signal is 16QAM forms.

Second aspect there is provided it is a kind of recognize orthogonal demodulation signal modulation format device, including：Power determination module, the symbol sebolic addressing for the orthogonal demodulation signal to reception carries out power normalization processing, obtains the respective normalized power of multiple symbols that symbol sebolic addressing is included；

Probability determination module, normalized power for the multiple symbol according to determination, determine that the normalized power of the multiple symbol falls the probability in default multiple power brackets, wherein, default multiple power brackets are according to the multiple reference modulation format settings being pre-selected；

Characteristic determination module, for being fallen according to the normalized power of the multiple symbol in the multiple power In the range of probability ratio, determine the power distribution characteristic value of the orthogonal demodulation signal；Identification module, for the power distribution characteristic value of determination and default multiple threshold values to be compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

With reference to second aspect, in the first possible implementation, the power determination module is specifically for according to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, determining the power average value of the multiple symbol；For each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

With reference to the first possible implementation of second aspect or second aspect, in second of possible implementation, the modulation format of the orthogonal demodulation signal is one kind in QPSK QPSK forms, 16 quadrature amplitude modulation QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

With reference to second of possible implementation, in the third possible implementation, described device also includes：

Power bracket setup module, the alternative scope of multiple power is preset for selecting multiple reference modulation forms in each modulation format in advance, and according to each reference modulation form of selection；According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power；According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR；According to default any alternative scope of power under the reference modulation format condition, it is determined that meet formula #/_ίΑWhen=0 as the power threshold determined in the alternative scope of the power, wherein, f=∑) [^∞ ^ ( )du\ + X [p(E_j ) w_J(u) du)], it is less than power t for determination^hI-th of benchmark normalized power of minimum value in the alternative scopes of j, is that ideally emergent power is E in the reference modulation form_tSymbol probability, ^ is j-th of benchmark normalized power for being more than maximum in the alternative scope of the power for determining, is ideally emergent power in the reference modulation form Wj (u)=sound work(

Rate, 1.（）For first kind modified Bessel function,_Wl(u) to be less than probability distribution of i-th of the benchmark normalized power of minimum value in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination,_Wj(u) to be more than probability distribution of j-th of benchmark normalized power under the conditions of the default OSNR of maximum in the alternative scope of the power in the reference modulation form that determines；According to each power threshold predetermined power scope of determination.

With reference to the third possible implementation, in the 4th kind of possible implementation, the power bracket setup module is specifically for when the reference modulation form being pre-selected is 16QAM forms, the default alternative scope of power is（0.2,1.0) and（1.0, 1.8 );When the reference modulation form being pre-selected is 256QAM forms, the default alternative scope of power is（1.8,2.0) and（2.1, 2.3);When the reference modulation form being pre-selected is 32QAM forms, the default alternative scope of power is（0.1,0.5), (0.5,0.9) and（0.9, 1.3);When the reference modulation form being pre-selected is 64QAM forms, the default alternative scope of power is（0.8,1.2), (0.6,0.8) and (1.2,1.4).

With reference to the 4th kind of possible implementation, in the 5th kind of possible implementation, the power bracket setup module specifically for, when the reference modulation form being pre-selected be 16QAM forms when, will be in the alternative scope of power（0.2,1.0 the power threshold determined in) is as the first critical value Pthl, by the alternative scope of power（0.2,1.0 the power threshold determined in) as the second critical value Pth2, predetermined power scope be [PtM, Pth2],（-∞, Pthl)、 (Pth2,+∞);, will be in the alternative scope of power when the reference modulation form being pre-selected is 256QAM forms（1.8,2.0 the power threshold determined in) is as the 3rd critical value Pth3, by the alternative scope of power（2.1,2.3 the power threshold determined in) as the 4th critical value Pth4, predetermined power scope for [Pth4 ,+∞), [Pth3, Pth4)；, will be in the alternative scope of power when the reference modulation form being pre-selected is 32QAM forms（0.1,0.5 the power threshold determined in) is used as the 5th critical value Pth5, by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value Pth6, by the alternative scope of power（0.9,1.3 the power threshold determined in) as the 7th critical value Pth7, predetermined power scope be [Pth5, Pth6],（-∞, Pth5)、 (Pth6, Pth7]；, will be in the alternative scope of power when the reference modulation form being pre-selected is 64QAM forms（0.8,1.2 the power threshold determined in) is less than Pth9 as the 8th critical value Pth8 and the 9th critical value Pth9, Pth8, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as the tenth critical value PthlO, by the alternative scope of power（1.2,1.4 the power threshold determined in) is as the 11st critical value Pthl 1, and predetermined power scope is [Pth8, Ptl:、 [PthlO, Pthll].

With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, the characteristic determination module is specifically for using formula Ratiol=^ P ([Pthl, Pth2]) _ determines the orthogonal modulation letter

P ((- ∞, Pthl], (Pth2 ,+∞)) numbers the first power distribution characteristic value Ratiol relative to reference modulation form 16QAM, wherein,

P ([Pthl, Pth2]) fall the probability in [Pthl, Pth2], P ((- ∞ for the normalized power of symbol in the orthogonal demodulation signal, Pthl], pth ∞ are that the normalized power of symbol in the orthogonal demodulation signal falls

(- ∞, Pthl or（Pth²,+∞) in probability；Using formula Rati.2=^P([^Pth4,^+∞)) determine the positive intermodulation

P ([Pth3, Pth4)) second power distribution characteristic value Ratio2 of the signal processed relative to reference modulation form 256QAM, wherein,

P ([Pth4, + ∞)) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth4, + ∞) in probability, P ([Pth3, Pth4)) be the orthogonal demodulation signal in symbol normalized power fall [Pth3, Pth4) in probability；Using formula Rati.3=--- P ([Pth5, Pth6]) --- determine the orthogonal demodulation signal relative to

P ((- ∞, Pth5), (Pth6, Pth7]) reference modulation form 32QAM the 3rd power distribution characteristic value Ratio3, wherein, P ([Pth5, Pth6]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth5, Pth6] in probability, P ((- ∞, Pth5)) is that the normalized power of symbol falls in the orthogonal demodulation signal（- ∞, Pth5) in probability,

P ((Pth6, Pth7]) fall for the normalized power of symbol in the orthogonal demodulation signal（Pth6, Pth7] in both rates；Using formula Rati.4 =^P([Pth8,^Pth9])Determine the orthogonal demodulation signal relative to reference modulation lattice

P ([PthlO, Pthl 1]) formula 64QAM the 4th power distribution characteristic value Ratio4, wherein, P ([Pth8, Pth9]) is the positive intermodulation The normalized power of symbol falls the probability in [Pth8, Pth9] in signal processed, and P ([PthlO, Pthll]) is that the normalized power of symbol in the orthogonal demodulation signal falls the probability in [PthlO, Pthl l].

With reference to the 6th kind of possible implementation, in the 7th kind of possible implementation, thresholding setup module, for it is default make P (A (tM) |_A)_{2+ P}(_B(tM)_B) maximum the first threshold value of value_Μ, wherein：

P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；P (B (thl) | B) it is that the Ratiol of B signal is less than when known B signal is not the signal of QPSK forms₁Probability；It is default to make P (dimensions²)|Α)₂₊ Ρ(Β _)Β)Maximum the second threshold value of value_th2, wherein:

P (A (th2) | A) it is that the Ratio2 of a-signal is not less than th2 probability when known a-signal is 256QAM forms or the signal of 64QAM forms and the Ratiol of a-signal is less than thl；P (B (th2) | B) it is when the signal and B signal that known B signal is 32QAM forms or 128QAM forms or 16QAM forms

Ratio, in₁When, the Ra of B signal_ti02It is less than_th2Probability;It is default to make Z^ } the 3rd maximum threshold value th3 of ^^ ^ value, wherein：P (A (th3) |) is that the Ratio4 of a-signal is not less than th3 probability when the signal and the Ratiol of a-signal that known a-signal is 256QAM forms are less than thl, the Ratio2 of a-signal is not less than th2；P (B (th3) | B) it is that the Ratio4 of B signal is less than th3 probability when the signal and the Ratiol of B signal that known B signal is 64QAM forms are less than thl, the Ratio2 of B signal is not less than th2；It is default to make P (Afth⁴)|A)₂₊ lWh⁴)_B) maximum the 4th threshold value of value_tM, wherein：

When P (A (th4) | A) is when known a-signal is 32QAM forms or the signal of 128QAM forms and the Ratiol of a-signal is less than thl, Ratio2 ' the J of a-signal, in th2, probability of the Ratio3 not less than th4 of a-signal；P (B (th4) | B) it is that the Ratio3 of B signals is less than th4 probability when the Ratio2 that the signal and the Ratiol of B signal that known B signal is 16QAM forms are less than thl, B signal is less than th2；It is default to make

^{P (A(th5})l^A)₂ ^{+ P}(^B(^th5)^B) maximum the 5th threshold value of value_th5, wherein： P₍^h₅₎| A) it is when known

When a-signal is less than thl for the signal of 32QAM forms and the Ratiol of a-signal, the Ratio2 of a-signal is less than the RaticS of th2, A signal and is not less than th4, the Ratio3 of A signals is not less than th5 probability； P (B (th5) B) be when the signal and the Ratio of B signal that known B signal is 128QAM forms be less than M,

The Ratio of B signal is less than t/2nd, when the Ratio2 of B signal is not less than tM, the probability that the Ratio2 of B signal is less than.

With reference to the 7th kind of possible implementation, in the 8th kind of possible implementation, the identification module is specifically for when the Ratol is not less than tM, the modulation format for determining the orthogonal demodulation signal is QPSK forms；When the Rat ol are less than tM and Ratio!Not less than t/When 2 and Ratio is not less than, the modulation format for determining the orthogonal demodulation signal is 256QAM forms；When the Ratol is less than tM and Rat₀2 are not less than t/2 and R_at ₀4 be less than t/ β when, determine the orthogonal demodulation signal modulation format be 64QAM forms；When the Ratol is less than M, Ratio!It is not less than ih4 and Rat less than th2,3- Ratio3₀3 are not less than t/When 5, the modulation format for determining the orthogonal demodulation signal is 32QAM forms；When described.1 is less than tM and Ratio!Less than t/2 and Ratio3 is not less than t/4 and Ratio3 ' }, when th5, determine the orthogonal demodulation signal modulation format be 128QAM forms；When the Ratol is less than tM and Rat₀2 are less than t/2 and Rat₀3 be less than tM when, determine the orthogonal demodulation signal modulation format be 16QAM forms.

The third aspect includes the device of the modulation format of the identification orthogonal demodulation signal provided such as the one or eight kind of any possible implementation of second aspect or second aspect there is provided a kind of digital signal processor.

Fourth aspect includes the device of the modulation format of the identification orthogonal demodulation signal provided such as the one or eight kind of any possible implementation of second aspect or second aspect there is provided a kind of receiver.

The embodiment of the present invention provides a kind of method and device for the modulation format for recognizing orthogonal demodulation signal, it is determined that multiple respective normalized powers of symbol in the symbol sebolic addressing of the orthogonal demodulation signal received, and determine that the normalized power of the plurality of symbol falls the probability in each default power bracket, the power distribution characteristic value of the orthogonal demodulation signal is determined therefrom that, the modulation format of the orthogonal demodulation signal is determined according to the comparative result of the power distribution characteristic value of determination and default multiple threshold values.The above method can avoid the influence of frequency deviation and phase noise to recognition result, and the accuracy of identification format modulation signal can be effectively improved in the system that EON etc. has larger frequency deviation and phase noise by applying.Brief description of the drawings Fig. 1 is the identification process of modulation format provided in an embodiment of the present invention；

Fig. 2 is the process of predetermined power scope provided in an embodiment of the present invention；

Fig. 3 is the probability distribution schematic diagram of the benchmark normalized power of symbol in ideally QPSK forms provided in an embodiment of the present invention, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this six kinds of modulation formats；

Fig. 4 for it is provided in an embodiment of the present invention under the conditions of certain OSNR in 16QAM forms the actual normalized power of each symbol probability distribution schematic diagram；

Fig. 5 determines the detailed process of the modulation format of the modulated signal for the comparative result of the power distribution characteristic value provided in an embodiment of the present invention according to modulated signal and default each threshold value；

Fig. 6 A ~ 6D is the simulated effect figure of the recognition methods provided in an embodiment of the present invention based on Fig. 5；Fig. 7 is the apparatus structure schematic diagram of the modulation format of identification orthogonal demodulation signal provided in an embodiment of the present invention；

Fig. 8 is coherent receiver structural representation provided in an embodiment of the present invention；

Fig. 9 is the identifying device hardware architecture diagram of the modulation format of identification orthogonal demodulation signal provided in an embodiment of the present invention.Embodiment

Due in different modulation formats, the probability distribution of symbol power has significantly different, therefore, influence in order to avoid frequency deviation and phase noise to identification modulation format, according to the probability distribution of the normalized power of each symbol in the orthogonal demodulation signal of reception in the embodiment of the present invention, the modulation format of the orthogonal demodulation signal is identified, this method is insensitive to frequency deviation and phase noise, when having applied to EON etc. in the system of larger frequency deviation and phase noise, the accuracy of identification modulation format can be effectively improved.

With reference to Figure of description, the embodiment of the present invention is described in detail.

Fig. 1 is the identification process of modulation format provided in an embodiment of the present invention, specifically includes following steps： S101 :Power normalization processing is carried out to the symbol sebolic addressing of the orthogonal demodulation signal of reception, the respective normalized power of multiple symbols that symbol sebolic addressing is included is obtained.

In embodiments of the present invention, receiver is received after the orthogonal demodulation signal of unknown modulation format, can The power of the multiple symbols included in the symbol sebolic addressing for first determining the orthogonal demodulation signal, and the power of the multiple symbols included in the symbol sebolic addressing according to the orthogonal demodulation signal, the normalization work(of the plurality of symbol is determined specifically, determining the method for the normalized power of each symbol in the orthogonal demodulation signal can be：According to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, determine the power average value of the plurality of symbol, for each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

For example, it is I (n) to install nth symbol in the symbol sebolic addressing of the orthogonal demodulation signal received, then the power abs (I (n)) of each symbol is can determine that², η=1,2,3., then determine the power average value mean [abs (I (n)) of each symbol²], for nth symbol Ι (η), determine its normalized power for ~₂ 。

Mean [abs (I (n))] wherein, if the orthogonal demodulation signal received is complex signal, the power ab of each symbol in the orthogonal demodulation signal_S(I(n))² = I² +Q², I is the real part of complex signal, and Q is the imaginary part of complex signal.

S102:According to the normalized power of the plurality of symbol of determination, determine that the normalized power of the plurality of symbol falls the probability in default multiple power brackets.

In embodiments of the present invention, above-mentioned default multiple power brackets are according to the multiple reference modulation format settings being pre-selected, namely, multiple reference modulation forms can be selected in each modulation format in advance, and preset multiple power brackets for each reference modulation form, determined by above-mentioned steps S101 in the orthogonal demodulation signal received after the normalized power of each symbol, default multiple power brackets can be directed to, determine that the normalized power of symbol in the orthogonal demodulation signal falls the probability in the power bracket.

Specifically, when determining that the normalized power of symbol in the orthogonal demodulation signal falls the probability in the power bracket for some default power bracket, it can first determine that normalized power falls the quantity of the symbol in the power bracket in the orthogonal demodulation signal, then the normalized power that the total ratio of all symbols in the symbol sebolic addressing of the quantity and the orthogonal demodulation signal is defined as symbol in the orthogonal demodulation signal is fallen in the work( Specifically, the ratio of the probability in multiple power brackets can be fallen according to the normalized power of the plurality of symbol, the power distribution characteristic value of orthogonal demodulation signal is determined.Further, because above-mentioned multiple power brackets are the reference modulation format settings for each selecting, therefore, it is determined that the orthogonal demodulation signal power distribution characteristic value when, default each reference modulation form can be directed to, fall the ratio of the probability in for the default each power bracket of the reference modulation form according to the normalized power of multiple symbols, determine power distribution characteristic value of the orthogonal demodulation signal relative to the reference modulation form.

S104:The power distribution characteristic value of determination and default multiple threshold values are compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

In embodiments of the present invention, predeterminable multiple threshold values, and the probability determined respectively for each power bracket according to step S102, the power distribution characteristic value of the orthogonal demodulation signal is determined using default method, the modulation format of the orthogonal demodulation signal is recognized according to the comparative result of the power distribution characteristic value of determination and default multiple threshold values.

Further, the modulation format described in the embodiment of the present invention includes QPSK

(Quadrature Phase Shift Keying, QPSK) form, 16 quadrature amplitude modulations（Quadrature Amplitude Modulation, QAM) form, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms, that is, in the identification process shown in Fig. 1, the modulation format of the orthogonal demodulation signal received is one kind in QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

Certainly, in addition to above-mentioned modulation format, recognition methods provided in an embodiment of the present invention applies also for other modulation formats, is only illustrated below exemplified by recognizing QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

Due in the step S102 shown in Fig. 1, receiver needs to be directed to default each power bracket, it is determined that the normalized power of symbol falls the probability in the power bracket in the modulated signal received, that is to say, that need to preset multiple power brackets in the embodiment of the present invention.And for QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this six kinds of modulation formats, the probability distribution of the normalized power of symbol in these modulation formats has obvious difference, therefore, can be according to the difference predetermined power of the probability distribution of the normalized power of symbol in these modulation formats Scope.The process of specific predetermined power scope can be as shown in Figure 2.

Fig. 2 is the process of predetermined power scope provided in an embodiment of the present invention, specifically includes following steps： S201 :Multiple reference modulation forms are selected in advance in each modulation format, and the alternative scope of multiple power is preset according to each reference modulation form of selection.

In embodiments of the present invention, multiple modulation formats can be pre-selected in each modulation format as reference modulation form, and the alternative scope of several power can be preset for the reference modulation form each selected, in the alternative scope of predetermined power, difference that can be based on each modulation format in the probability distribution of normalized power is set.

S202:According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power.

Specifically, it is determined that during the benchmark normalized power of each symbol in some reference modulation form under unglazed noise situations, it can determine that the power of each symbol included under unglazed noise situations in the reference modulation form, and determine the average value of the power of each symbol included under unglazed noise situations in the reference modulation form, be directed to each symbol again, using the ratio of the power of the symbol and the average value as the symbol benchmark normalized power.

For example, it is assumed that have selected modulation format on the basis of QPSK forms, then because, altogether comprising four symbols, the power of each symbol is identical, therefore in QPSK forms, the normalized power of each symbol is 1 in QPSK forms.That is, under unglazed noise situations, if the modulation format of the orthogonal demodulation signal received is QPSK forms, the normalized power of the symbol so occurred in the orthogonal demodulation signal is exactly the benchmark normalized power 1 of the symbol, but it can be floated due to there is the normalized power of the symbol of this in noise, therefore practical application in practical application near 1.

S203:According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR.

Under the conditions of certain OSNR, the normalized power of each symbol floats near benchmark normalized power in reference modulation form, and for QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this six kinds of modulation formats, symbol in these modulation formats is all real part I and imaginary part Q in complex signal, its complex signal certain Suffered noise jamming can be approximately additive white Gaussian noise under the conditions of signal to noise ratio.

Assuming that the benchmark normalized power of some symbol in reference modulation form is designated as into V², the real part I of the symbol is ul in the ideal situation, and imaginary part Q is u2 in the ideal situation, then_V ² = ul² +u2²。

And because the noise jamming real part I and imaginary part Q of the symbol suffered under the conditions of certain signal to noise ratio is additive white Gaussian noise, therefore, probability distribution of the real part I and imaginary part Q of the symbol under the conditions of certain OSNR is two independent Gaussian Profiles, the average of the two independent Gaussian Profiles is designated as ul and u2, and variance is σ², actually variances sigma²It is exactly the noise power under the conditions of the OSNR, σ²Value it is relevant with OSNR, the noise power under the conditions of certain OSNR_σ ²It is also certain.General, OSNR and noise power σ²Meet OSNR=^E(s² ₂) ^Symb0lRateRelation, wherein, OSNR

2σ 12.5e9

For OSNR, E (s²) it is signal power, and E (s²) it is a definite value, SymbolRate is symbol rate, and general S mbolRate are 32Gs/s.

Further, due to the symbol normalized power u for the real part I and imaginary part Q of the symbol quadratic sum, and real part I and imaginary part Q be two it is independent, with ul and_U2 be average, with σ²For the Gaussian Profile of variance, therefore, the normalized power u of symbol probability distribution w (u) is actually one non-central；^ points

, wherein, ι.（）For first kind amendment shellfish plug 4 It is above-mentioned^w(^u) = ^{2σ 1}Implication be：Probability of the symbol that one benchmark normalized power is when the actual normalized power under the conditions of the OSNR is u is w (u).

By the above method, the benchmark normalized power V of each symbol in reference modulation form is being determined by step S202²Afterwards, can according to default OSNR OSNR, using formula OSNR=^E(s² ₂) ^^{ο1Κ ϊ£}

2 σ 12.5e9 determine the noise power σ under the conditions of the default OSNR², and for each benchmark normalized power V², it is determined that in the reference modulation form under the conditions of the default OSNR benchmark normalized power probability Distribution is exactly

S204:According to default any alternative scope of power under the reference modulation format condition, it is determined that meeting formula df I du_thU when=0_thIt is used as the power threshold determined in the alternative scope of the power.

In embodiments of the present invention, for some reference modulation form of selection, power threshold can be determined in each alternative scope of power default for the reference modulation form.Wherein,^f =∑[ P(^Ei)l⁺ ^ (^du] + ^ [ pCE j¹¹* Wj C^du)], for determination

I j are less than i-th of benchmark normalized power of minimum value in the alternative scope of the power, the probability for the symbol that P (Ei) is ^ for emergent power in the ideally reference modulation form, Ε " is j-th of the benchmark normalized power for being more than maximum in the alternative scope of the power determined, and p (Ej) is the ideally reference modulation form

Wj (u)=work(

Rate, 1.（）For first kind modified Bessel function,_Wl(u) to be less than probability distribution of i-th of the benchmark normalized power of minimum value in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination,_Wj(u) to be more than probability distribution of j-th of benchmark normalized power under the conditions of the default OSNR of maximum in the alternative scope of the power in the reference modulation form that determines.

Further, also predeterminable a variety of different OSNR conditions, in the modulation format on the basis of some modulation format and when power threshold is determined in some default alternative scope of power, can be respectively under the conditions of default a variety of different OSNRs, determine power threshold, and the average for each power threshold determined under the conditions of different OSNRs is redefined for power threshold.

S205:According to each power threshold predetermined power scope of determination.

Determine after power threshold, then can according to each power threshold predetermined power scope of determination, e.g., Scope between certain two power threshold is defined as default power bracket, or the positive/negative infinite scope to some power threshold is defined as default power bracket.

Illustrate power bracket preset procedures as shown in Figure 2 below with QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this six kinds of modulation formats.

Due to the purpose of the embodiment of the present invention be will difference of the symbol based on different modulating form in the probability distribution of normalized power, to identify the modulation format of orthogonal demodulation signal, therefore, need to find out the difference of the probability distribution of the normalized power of symbol in this above-mentioned six kinds of modulation formats, illustrate the difference of the probability distribution of the normalized power of symbol in above-mentioned six kinds of modulation formats by taking Fig. 3 as an example below, as shown in Figure 3.

Fig. 3 is the probability distribution schematic diagram of the benchmark normalized power of symbol in QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this six kinds of modulation formats under unglazed noise situations provided in an embodiment of the present invention.Normalized power on the basis of axis of abscissas in Fig. 3, axis of ordinates is 4 both rates, using 2000 represent 4 both rate as 100%.

Difference one, as seen from Figure 3, under unglazed noise situations, compared to 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms this five kinds of modulation formats, the benchmark normalized power of the symbol of QPSK forms only has numerical value 1, and this is a kind of, that is, under the conditions of certain OSNR, the normalized power of the symbol in QPSK forms is concentrated mainly near numerical value 1, and other five kinds of modulation formats are quite different.Therefore, QPSK forms and other five kinds of modulation formats are distinguished in the embodiment of the present invention based on the difference one.Based on such thinking, several power thresholds can be determined in the embodiment of the present invention near numerical value 1, and based on these power threshold predetermined power scopes.

Method based on one predetermined power scope of difference is specific as follows：

As seen from Figure 3, the probability distribution of the benchmark normalized power of symbol is more loose near numerical value 1 in 16QAM forms, is easy near numerical value 1 determine power threshold, therefore, modulation format on the basis of selection 16QAM forms.

It has selected on the basis of 16QAM forms after modulation format, can the probability distribution based on normalized power of each symbol under the conditions of certain OSNR in 16QAM forms, in the left and right sides of numerical value 1, namely respectively select a power critical point in the scope less than numerical value 1 and more than the scope of numerical value 1, and can be seen that by Fig. 3, in the ideal situation, the benchmark normalized power of symbol is 0.2,1 in 16QAM forms , therefore, can be by when the reference modulation form being pre-selected is 16QAM forms with 1.8（0.2,1.0) and（1.0,1.8) the two scopes determine power threshold as the alternative scope of default power, and in the alternative scope of the two power.

Fig. 4 for it is provided in an embodiment of the present invention under the conditions of certain OSNR in 16QAM forms the actual normalized power of each symbol probability distribution schematic diagram.By Fig. 4 it can be seen that, under the conditions of certain OSNR, benchmark normalized power is the probability distribution of the actual normalized power of 0.2 symbol in 16QAM forms, have with benchmark normalized power for the probability distribution of the actual normalized power of 1.0 symbol and intersect, benchmark normalized power is the probability distribution of the actual normalized power of 1.0 symbol, also have for the probability distribution of the actual normalized power of 1.8 symbol with benchmark normalized power and intersect, this is also implied that under the conditions of certain OSNR, the symbol that the symbol that benchmark normalized power is 0.2 may be 1.0 by normalized power on the basis of misjudgement, the symbol that the symbol that benchmark normalized power is 1.0 may be 1.8 by normalized power on the basis of misjudgement, therefore, it is determined that needing the probability by this misjudgement to minimize during power threshold.

So as to, it is assumed that in the alternative scope of power（0.2,1.0 an optional value is as power threshold in), then the probability for above-mentioned misjudgement occur is f=∑ [p (E_t )f w_} u)du\ +∑ [p(E_j) benevolence w_J (u)du) =

' "^Λ j

(·+∞ ru_th f u_th' in, E -0.2, p (E_x ) w_x (u)du + p{E₂) \ w₂ (u)du + p(E₃ ) w₃ (u)du

J -⁰⁰ J-^∞

E₂ = 1.0 , £₃= 1.8.And as seen from Figure 4, under the conditions of certain OSNR, benchmark normalized power falls in the alternative scope of power for the actual normalized power of 1.8 symbol in 16QAM forms（0.2,1.0) probability in is very small, and almost 0, therefore, the new probability formula of above-mentioned misjudgement can be reduced to： f =∑ [p(E_t )f w_} u)du\ +∑ [p(E_j ) J: w_J (u)du) =

' "^Λ j

(·+∞ ru_th °

p(E_x ) w_x(u)du + p{E₂) \ w₂(u) du is visible, and the probability of above-mentioned misjudgement/it is a function for thinking independent variable, to make above-mentioned misjudgement Probability/minimum, if order value be make=o when value, therefore, in the alternative scope of power（0.2,1.0) when determining power threshold in, as long as conduct when determining to meet=0 is in the alternative scope of the power（0.2,1.0 the power threshold determined in).

Further, in order to reduce amount of calculation, above-mentioned calculating

PiE,)] w^du + piE w₂0) during i w, stepping can be used to set the discrete integration computing of step-length, such as step-length can be 0.1, with avoid by amount of calculation that continuous integral computing is brought it is excessive the problem of.Wherein, the setting step-length can be set as needed, if the amount of calculation in order to reduce integration as far as possible, can will set the larger of step size settings, if the accuracy in order to improve follow-up identification modulation format, can will set the smaller of step size settings.

Further, due to the 16QAM forms when symbol rate is 32Gs/s signal when the bit error rate is 2e-2 possible OSNR scope be 17 ~ 22dB, therefore, predeterminable OSNR condition is 17dB, 18dB, 19dB, 20dB, 21dB, 22dB, and respectively under the conditions of this six signal to noise ratio, using the above method in the alternative scope of power（0.2,1.0) power threshold is determined in, finally using the average value of determine six power thresholds again as in the alternative scope of power（0.2,1.0 the power threshold determined in).

Similar, can be in the alternative scope of power（1.0,1.8 a power threshold is also determined in).When will be using reference modulation form as 16QAM forms, in the alternative scope of power（0.2,1.0 the power threshold determined in) is as the first critical value ^l, by the alternative scope of power（0.2,1.0) in determine power threshold as the second critical value after above-mentioned calculating, pth be 0.6, p 1.4, as shown in two dotted lines in two dotted lines in the probability distribution coordinate of QPSK benchmark normalized power in Fig. 3 or Fig. 4.Predetermined power may range from [Μ, 7^2], (- ∞, PtM), (7^2 ,+∞), that is, [0.4,1.6],

(_∞, 0.4)、 (1.6,+∞)。

So far, QPSK forms and other five kinds of modulation formats can have been distinguished by difference one.

Difference two, as seen from Figure 3, under unglazed noise situations, compared to 16QAM forms, 32QAM forms, 128QAM forms these three modulation formats, the benchmark normalized power of the only symbol of both modulation formats of 64QAM forms and 256QAM forms has probability point in the range of more than 2.2 Cloth, therefore, the embodiment of the present invention is come the modulation format for distinguishing a modulated signal based on the difference two

One kind in one kind in 16QAM forms, 32QAM forms, 128QAM forms these three modulation formats, or 64QAM forms and 256QAM forms both modulation formats.Based on such thinking, several power thresholds can be determined in the embodiment of the present invention near numerical value 2.2, and based on these power threshold predetermined power scopes.

Method based on two predetermined power scopes of difference is specific as follows：

As seen from Figure 3, distribution of the probability distribution of the benchmark normalized power of symbol near numerical value 2.2 is more loose in 256QAM forms, is easy near numerical value 2.2 determine power threshold, therefore, modulation format on the basis of selection 256QAM forms.

It have selected on the basis of 256QAM forms after modulation format, can the probability distribution based on normalized power of each symbol under the conditions of certain OSNR in 256QAM forms, in the left and right sides of numerical value 2.2, namely respectively select a power critical point in the scope less than numerical value 2.2 and more than the scope of numerical value 2.2, and as seen from Figure 3, in the ideal situation, the benchmark normalized power of symbol in 2.2 both sides is 1.8 in 256QAM forms, 2.0, 2.1 and 2.3, therefore, when the reference modulation form being pre-selected is 256QAM forms, can be by（1.8,2.0) and（2.1,2.3) the two scopes determine power threshold as the alternative scope of default power, and in the alternative scope of the two power.

Likewise, in the alternative scope of power（1.8,2.0) and（2.1,2.3) when determining power threshold in, formula can be based on^{f =}∑[P(^E _i )J*_u ^+∞w _i (^u)^du] ⁺∑[P(^Ej )j: ^wj (^u)^du)] determine mistake

The probability that i j sentence, and determine to meet df I du_thU when=0_thIt is used as the power threshold determined in the alternative scope of corresponding power.

Further, due to the 256QAM forms when symbol rate is 32Gs/s signal when the bit error rate is 2e-2 possible OSNR scope be 28 ~ 33dB, therefore, predeterminable OSNR condition is 28dB, 29dB, 30dB, 31dB, 32dB, 33dB, and respectively under the conditions of this six signal to noise ratio, using the above method in the alternative scope of power（1.8,2.0) and（2.1,2.3) power threshold is determined in, finally determines the average value of determine six power thresholds as in the alternative scope of corresponding power again Power threshold.

When will be using reference modulation form as 256QAM forms, in the alternative scope of power（1.8,2.0 the power threshold determined in) is as the 3rd critical value Pth3, by the alternative scope of power（2.1,2.3) power threshold determined in is as the 4th critical value Pth4, and after above-mentioned calculating, Pth3 is 1.9, Pth4 is 2.2, as shown in two dotted lines of the rightmost side in the probability distribution coordinate of 64QAM in Fig. 3 and 256QAM benchmark normalized power.Predetermined power may range from [Pth⁴,+∞), [Pth3, Pth4), that is, [².²,+∞), [1.9,2.2).

So far, the modulation formats that can have distinguished a modulated signal by difference two are one kind in 16QAM forms, 32QAM forms, 128QAM forms these three modulation formats, or one kind in 64QAM forms and 256QAM forms both modulation formats.

Difference three, as seen from Figure 3, for 16QAM forms, 32QAM forms, for these three modulation formats of 128QAM forms, in the range of benchmark normalized power is 0 ~ 1.2, probability of the benchmark normalized power of symbol near numerical value 0.5 is about 1/2 in 32QAM forms, probability of the benchmark normalized power of symbol near numerical value 0.5 is about 1/4 in 128QAM forms, and probability of the benchmark normalized power of symbol near numerical value 0.5 is almost 0 in 16QAM forms, therefore, 16QAM forms are distinguished based on difference three in the embodiment of the present invention, 32QAM forms and 128QAM forms.Based on such thinking, several power thresholds can be determined in the embodiment of the present invention near numerical value 0.5 and near numerical value 1.2, and based on these power threshold predetermined power scopes.

Method based on three predetermined power scopes of difference is specific as follows：

As seen from Figure 3, distribution of the probability distribution of the benchmark normalized power of symbol near numerical value 0.5 and 1.2 is more loose in 32QAM forms, it is easy near numerical value 0.5 and 1.2 determine power threshold, therefore, modulation format on the basis of selection 32QAM forms.

It has selected on the basis of 32QAM forms after modulation format, can the probability distribution based on normalized power of each symbol under the conditions of certain OSNR in 32QAM forms, near the left and right sides of numerical value 0.5 and numerical value 1.2, namely a power critical point is respectively selected near the scope less than numerical value 0.5, the scope more than numerical value 0.5 and numerical value 1.2, and as seen from Figure 3, in the ideal situation, in 32QAM forms The benchmark normalized power of symbol is 0.1 and 0.9 0.5 both sides, and what it is in 1.2 both sides is 0.9 and 1.3, therefore, when the reference modulation form being pre-selected is 32QAM forms, can be by（0.1, 0.5)、（0.5,0.9) and（0.9,1.3) these three scopes determine power threshold as the alternative scope of default power, and in the alternative scope of these three power.

Likewise, in the alternative scope of power（0.1, 0.5)、（0.5,0.9) and（0.9,1.3) when determining power threshold in, can based on formula f=2^ () it is wide $ ^]+^^ (^)] *^¾$ " (11) ^)] determine misjudgement probability, and determine meet df I du_thU when=0_thIt is used as the power threshold determined in the alternative scope of corresponding power.

Further, due to the 32QAM forms when symbol rate is 32Gs/s signal when the bit error rate is 2e-2 possible OSNR scope be 20 ~ 25dB, therefore, predeterminable OSNR condition is 20dB, 21dB, 22dB, 23dB, 24dB, 25dB, and respectively under the conditions of this six signal to noise ratio, using the above method in the alternative scope of power（0.1, 0.5)、（0.5,0.9) and（0.9,1.3) power threshold is determined in, finally the average value of determine six power thresholds is regard as the power threshold determined in the alternative scope of corresponding power again.

When will be using reference modulation form as 32QAM forms, in the alternative scope of power（0.1,0.5 the power threshold determined in) is as the 5th critical value Pth5, by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value Pth6, by the alternative scope of power（0.9,1.3) power threshold determined in is used as the 7th critical value Pth7, after above-mentioned calculating, Pth5 is 0.4, Pth6 is 0.8, Pth7 is 1.2, as shown in three dotted lines in the probability distribution coordinate of 16QAM, 32QAM and 128QAM benchmark normalized power in Fig. 3.Predetermined power may range from [Pth5, Pth6],（- ∞, Pth5), (Pth6, Pth7], that is, [0.4,0.8], (- ∞, 0.4), (0.8,1.2].

So far, 16QAM forms, 32QAM forms and 128QAM forms can have been distinguished by difference three.

Difference four, as seen from Figure 3, is the benchmark of symbol in 64QAM forms in the range of 0.8 ~ 1.3 in benchmark normalized power for 64QAM forms and 256QAM forms both forms Probability of the normalized power near numerical value 1.0 is almost 0, probability of the benchmark normalized power of symbol near numerical value 1.0 is about 1/2 in 256QAM forms, therefore, 64QAM forms and 256QAM forms are distinguished based on difference four in the embodiment of the present invention.Based on such thinking, several power thresholds can be determined in the embodiment of the present invention near numerical value 1.0, near numerical value 0.8 and near numerical value 1.3, and based on these power threshold predetermined power scopes.

Method based on four predetermined power scopes of difference is specific as follows：

As seen from Figure 3, distribution of the probability distribution of the benchmark normalized power of symbol near numerical value 0.8,1.0,1.3 is more loose in 64QAM forms, it is easy near numerical value 0.8,1.0,1.3 determine power threshold, therefore, modulation format on the basis of selection 64QAM forms.

It have selected on the basis of 64QAM forms after modulation format, can the probability distribution based on normalized power of each symbol under the conditions of certain OSNR in 64QAM forms, in the left and right sides of numerical value 1.0, numerical value 0.8 is nearby and near numerical value 1.3, namely in the scope less than numerical value 1.0, scope and numerical value 1.2 more than numerical value 1.0 nearby and near numerical value 1.3 respectively select a power critical point, and as seen from Figure 3, in the ideal situation, the benchmark normalized power of symbol in 1.0 both sides is 0.8 and 1.2 in 64QAM forms, what it is in 0.8 both sides is 0.6 and 0.8, what it is in 1.3 both sides is 1.2 and 1.4, therefore, when the reference modulation form being pre-selected is 64QAM forms, can be by（0.8,1.2), (0.6,0.8) and（1.2,1.4) these three scopes determine power threshold as the alternative scope of default power, and in the alternative scope of these three power.

Likewise, in the alternative scope of power（0.8, 1.2 )、（0.6,0.8) and（1.2,1.4) when determining power threshold in, based on formula and it can determine Meet df I du_thU when=0_thIt is used as the power threshold determined in the alternative scope of corresponding power.

It is slightly different, when the reference modulation form being pre-selected is 64QAM forms, in the alternative scope of power（0.8,1.2) two power thresholds can determine that using the above method in, that is, in the alternative scope of power（0.8,1.2 it can determine that two meet df/du in)_thU when=0_th, the two values are all The power threshold being to determine out.

Further, due to the 64QAM forms when symbol rate is 32Gs/s signal when the bit error rate is 2e-2 possible OSNR scope be 22 ~ 27dB, therefore, predeterminable OSNR condition is 22dB, 23dB, 24dB, 25dB, 26dB, 27dB, and respectively under the conditions of this six signal to noise ratio, using the above method in the alternative scope of power（0.8, 1.2)、（0.6,0.8) and（1.2,1.4) power threshold is determined in, finally the average value of determine six power thresholds is regard as the power threshold determined in the alternative scope of corresponding power again.

When will be using reference modulation form as 64QAM forms, in the alternative scope of power（0.8,1.2) in determine two power thresholds as the 8th critical value Pth8 and the 9th critical value Pth9, wherein, Pth8 be less than Pth9, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as the tenth critical value PthlO, by the alternative scope of power（1.2,1.4) power threshold determined in is used as the 11st critical value Pthll, after above-mentioned calculating, Pth8 is 0.9, Pth9 is 1.1, PthlO is that 0.8, Pthll is 1.3, as shown in four dotted lines of the leftmost side in the probability distribution coordinate of 64QAM in Fig. 3 and 256QAM benchmark normalized power.Predetermined power may range from [Pth8, Pth9], [PthlO, Pthll], that is, [0.9,1.1], [0.8,1.3].

So far, 64QAM forms and 256QAM forms can be distinguished by difference four.

Above-mentioned Pthl ~ the Pthll determined can also carry out ± 0.1 fine setting as needed, to facilitate follow-up identification.

In embodiments of the present invention, set out in advance after several above-mentioned power brackets based on aforementioned four difference, when being identified by the modulation format for the orthogonal demodulation signal that step S101 is received by method as shown in Figure 1, also to be based on several default above-mentioned power brackets, the power distribution characteristic value of the orthogonal demodulation signal is determined by step S103, that is, quantifying the characteristic value during the orthogonal demodulation signal received is distinguished at above-mentioned four kinds.

In embodiments of the present invention, quantifying the method for the characteristic value during the orthogonal demodulation signal that receives is distinguished at above-mentioned four kinds can be：For default each reference modulation form, fall the ratio of the probability in for default power bracket of the reference modulation form according to the normalized power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, determine volume of the orthogonal demodulation signal relative to the reference modulation form Power distribution characteristic value.

Specifically, for default reference modulation form 16QAM, formula can be used

Ratiol=^ P ([Pthl, Pth2]) _ determine the orthogonal demodulation signal relative to reference modulation form

P((-∞,Pthl],(Pth2,+∞))

16QAM the first power distribution characteristic value Ratiol, wherein, P ([Pthl, Pth2]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pthl, Pth2] in probability, P ((- ∞, Pthl], (Pth2 ,+∞)) fall for the normalized power of symbol in the orthogonal demodulation signal（- ∞, Pthl] or（Pth2 ,+∞) in probability；

For default reference modulation form 256QAM, formula Rati can be used.2=^P([^Pth4,^+∞》Really

P ([Pth3, Pth4)) fixed second power distribution characteristic value Ratio2 of the orthogonal demodulation signal relative to reference modulation form 256QAM, wherein, P ([Pth4 ,+∞):Normalized power for symbol in the orthogonal demodulation signal falls in [Pth4, + ∞) in probability, P ([Pth3, Pth4)) be symbol in the orthogonal demodulation signal normalized power fall [Pth3, Pth4) in ^ both rates；

For default reference modulation form 32QAM, formula can be used

RatioS = ^Ρ1^[ ,r,

P ((- oo, Pth5), (and Pth6, Pth7]) determine the orthogonal demodulation signal relative to reference modulation form

32QAM the 3rd power distribution characteristic value Ratio3, wherein, P ([Pth5, Pth6]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth5, Pth6] in both rates, P ((- ∞, Pth5)) is that the normalized power of symbol in the orthogonal demodulation signal falls（- ∞, Pth5) in both rates, P ((Pth6, Pth7]) is that the normalized power of symbol in the orthogonal demodulation signal falls（Pth6, Pth7] in probability；

For default reference modulation form 64QAM, can using formula Ratio4=P ([^Pth8,^Pth9]) true fixed fourth power distribution characteristic values of the orthogonal demodulation signal relative to reference modulation form 64QAM of γ P ([PtM0, Pthll])

Ratio4, wherein, P ([Pth8, Ptl]:Normalized power for symbol in the orthogonal demodulation signal falls

Probability in [Pth8, Pth9], P ([PthlO, Pthll]) is that the normalized power of symbol in the orthogonal demodulation signal falls the probability in [PthlO, Pthl 1].

In embodiments of the present invention, for the modulated signal received determine Ratiol, Ratio2, Ratio3,

, then can be by step S104 as shown in Figure 1 by each power after this four power distribution characteristic values of Ratio4 Distribution characteristics value is compared with default multiple threshold values, and recognizes according to comparative result the modulation format of the modulated signal.

Further, multiple threshold values can be preset using following methods in the embodiment of the present invention：

It is default to make P (dimension l) | A)₂₊ P(B₍tM_)B)Maximum the first threshold value of value_Μ, wherein：

P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；

P (A (th2) | A) it is that the Ratio2 of a-signal is not less than th2 probability when known a-signal is 256QAM forms or the signal of 64QAM forms and the Ratiol of A signals is less than thl；

P (B (th2) | B) it is that the Ratio2 of B signal is less than th2 probability when known B signal is 32QAM forms or the signal of 128QAM forms or 16QAM forms and the Ratiol of B signal is less than thl；The 3rd maximum threshold value of the default value for making P (A (th3) | A) ÷ P (B (th3) B), wherein：

P (B (th4) | B) it is when the signal and the Ratiol of B signal that known B signal is 16QAM forms are small When the Ratio2 of thl, B signal is less than th2, the Ratio3 of B signal is less than th4 probability；It is default to make P (^) | A) ÷ P (B (th5) B) maximum the 5th threshold value of value_th5, wherein：

P (A (th5) |) is that the Ratio3 of a-signal is not less than th5 probability when the signal and the Ratiol of a-signal that known a-signal is 32QAM forms are less than thl, the Ratio2 of a-signal is less than th2, the Ratio3 of a-signal is not less than th4；

Namely, according to the aforementioned four power distribution characteristic value of the modulated signal of known modulation format in the embodiment of the present invention, and the accuracy of the modulation format identified by the comparative result of this four power distribution characteristic values and each threshold value, it is determined that making each threshold value of accuracy highest.It is computed, is respectively based on default five threshold values of the above method：Thl is that 1.2, th2 is that 0.7, th3 is that 0.37, th4 is that 0.41, th5 is 0.55.

Preset using the above method after five threshold values thl, th2, th3, th4, th5, then in step S104, the modulation format for the orthogonal demodulation signal that can be specifically received by method identification as shown in Figure 5, as shown in Figure 5.

Fig. 5 determines the detailed process of the modulation format of the orthogonal demodulation signal for the comparative result of the power distribution characteristic value provided in an embodiment of the present invention according to modulated signal and default each threshold value, specifically includes following steps：

S 10401 :Judge whether Ratiol is not less than thl, if so, then performing step S 10402, otherwise perform step S 10403.

S10402:The modulation format for determining the orthogonal demodulation signal is QPSK forms.

S 10403:Judge whether Ratio2 is not less than th2, if so, then performing step S 10404, otherwise perform step S 10407.

S 10404:Judge whether Ratio4 is not less than th3, if so, then performing step S 10405, otherwise perform step S 10406. S10405:The modulation format for determining the orthogonal demodulation signal is 256QAM forms.

S10406:The modulation format for determining the orthogonal demodulation signal is 64QAM forms.

S 10407:Judge whether Ratio3 is not less than th4, if so, then performing step S 10408, otherwise perform step S 10411.

S 10408:Judge whether Ratio3 is not less than th5, if so, then performing step S 10409, otherwise perform step S 10410.

S10409:The modulation format for determining the orthogonal demodulation signal is 32QAM forms.

S10410:The modulation format for determining the orthogonal demodulation signal is 128QAM forms.

S10411 :The modulation format for determining the orthogonal demodulation signal is 16QAM forms.

Fig. 6 A ~ 6D is the simulated effect figure of the recognition methods provided in an embodiment of the present invention based on Fig. 5.Axis of abscissas in Fig. 6 A ~ 6D is OSNR, the value that axis of ordinates in Fig. 6 A is Ratiol, the value that axis of ordinates in the value that axis of ordinates in the value that axis of ordinates in Fig. 6 B is Ratio2, Fig. 6 C is Ratio3, Fig. 6 D is Ratio4.

It is that the first threshold value thl can distinguish QPSK forms and other five kinds of modulation formats with 1.2 it can be seen from Fig. 6 A in the range of OSNR is 13 ~ 36dB（16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms）.When the Ratiol of the modulated signal received is not less than 1.2, the modulation format of modulated signal is QPSK forms, is otherwise one kind in other five kinds of modulation formats.

It can be seen that by Fig. 6 B, in the range of OSNR is 17 ~ 36dB, it is that the modulation format that the second threshold value th2 can distinguish modulated signal is one kind in 64QAM forms and 256 QAM forms with 0.7, or one kind in 16 QAM forms, 32QAM forms, 128QAM forms.When the Ratio2 of the modulated signal received is not less than 0.7, the modulation format of modulated signal is one kind in 64QAM forms and 256 QAM forms, is otherwise one kind in 16 QAM forms, 32QAM forms, 128QAM forms.

It is that the modulation format that the 4th threshold value th4 can distinguish modulated signal is one kind in 32QAM forms and 128 QAM forms with 0.41 it can be seen from Fig. 6 C in the range of OSNR is 20 ~ 36dB, or 16QAM.When the Ratio3 of the modulated signal received is not less than 0.41, modulated signal Modulation format be 32QAM forms and 128 QAM forms in one kind, be otherwise 16 QAM forms.It is that the 5th threshold value th5 can distinguish 32 QAM forms and 128 QAM forms with 0.55.When the Ratio3 of the modulated signal received is not less than 0.55, the modulation format of modulated signal is 32QAM forms, is otherwise 128 QAM forms.

It is that the 3rd threshold value th3 can distinguish 64QAM forms and 256 QAM forms with 0.37 it can be seen from Fig. 6 D in the range of OSNR is 19 ~ 36dB.When the Ratio4 of the modulated signal received is not less than 0.37, the modulation format of modulated signal is 256QAM forms, is otherwise 64 QAM forms.

Therefore, it is provided in an embodiment of the present invention above-mentioned as shown in table 1 to QPSK forms, 16 QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, OSNR scope that the recognition methods of 256QAM forms is applicable.Light noise applicable the QAM 32QAM 64QAM 128QAM 256QAM of modulation format QPSK 16

12-36 17-36 20-36 22-36 20-36 19-36 compare scope（DB) table 1

Because the method for above-mentioned identification modulation format is to frequency deviation and phase noise and insensitive, therefore in the system that EON etc. has larger frequency deviation and phase noise, the modulation format of modulated signal still can be accurately recognized.

It is the recognition methods of modulation format provided in an embodiment of the present invention above, based on same thinking, the embodiment of the present invention also provides a kind of identifying device of modulation format, as shown in Figure 7.

Fig. 7 is the apparatus structure schematic diagram of the modulation format of identification orthogonal demodulation signal provided in an embodiment of the present invention, is specifically included：

Power determination module 701, the symbol sebolic addressing for the orthogonal demodulation signal to reception carries out power normalization processing, obtains the respective normalized power of multiple symbols that symbol sebolic addressing is included；

Probability determination module 702, normalized power for the multiple symbol according to determination, determine that the normalized power of the multiple symbol falls the probability in default multiple power brackets, wherein, default multiple power brackets are according to the multiple reference modulation format settings being pre-selected； If multiple power brackets be according to multiple reference modulation format settings for being pre-selected；Characteristic determination module 703, the ratio for falling the probability in the multiple power bracket according to the normalized power of the multiple symbol, determines the power distribution characteristic value of the orthogonal demodulation signal；

Identification module 704, for the power distribution characteristic value of determination and default multiple threshold values to be compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

The power determination module 701 is specifically for according to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, determining the power average value of the multiple symbol；For each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

The modulation format of the orthogonal demodulation signal is one kind in QPSK QPSK forms, 16 quadrature amplitude modulation QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

Described device also includes：

Power bracket setup module 705, the alternative scope of multiple power is preset for selecting multiple reference modulation forms in each modulation format in advance, and according to each reference modulation form of selection；According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power；According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR；According to default any alternative scope of power under the reference modulation format condition, it is determined that meeting formula # l du_th^ when=0 as the power threshold determined in the alternative scope of the power, wherein, f=[p (E_j ) w_J(u) du)], it is less than the power for determination

I-th of benchmark normalized power of minimum value in alternative scope, is that ideally emergent power is E in the reference modulation form_tSymbol probability, ^ is j-th of benchmark normalized power for being more than maximum in the alternative scope of the power for determining, is ideally emergent power in the reference modulation form Wj(u) = σ²For the noise work(under the conditions of the default OSNR

The power bracket setup module 705 is specifically for when the reference modulation form being pre-selected is 16QAM forms, the default alternative scope of power is（0.2,1.0) and（1.0, 1.8);When the reference modulation form being pre-selected is 256QAM forms, the default alternative scope of power is（1.8,2.0) and（2.1, 2.3);When the reference modulation form being pre-selected is 32QAM forms, the default alternative scope of power is（0.1,0.5), (0.5,0.9) and（0.9, 1.3);When the reference modulation form being pre-selected is 64QAM forms, the default alternative scope of power is（0.8,1.2), (0.6,0.8) and（1.2, 1.4).

The power bracket setup module 702 specifically for, when the reference modulation form being pre-selected be 16QAM forms when, will be in the alternative scope of power（0.2,1.0 the power threshold determined in) is as the first critical value Pthl, by the alternative scope of power（0.2,1.0 the power threshold determined in) is as the second critical value Pth2, and predetermined power scope is [Pthl, Pth2], (- ∞, Pthl), (Pth2 ,+∞);, will be in the alternative scope of power when the reference modulation form being pre-selected is 256QAM forms（1.8,2.0 the power threshold determined in) is as the 3rd critical value Pth3, by the alternative scope of power（2.1,2.3 the power threshold determined in) as the 4th critical value Pth4, predetermined power scope for [Pth4 ,+∞), [Pth3, Pth4);, will be in the alternative scope of power when the reference modulation form being pre-selected is 32QAM forms（0.1,0.5 the power threshold determined in) is as the 5th critical value Pth5, by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value Pth6, by the alternative scope of power（0.9,1.3 the power threshold determined in) as the 7th critical value Pth7, predetermined power scope be [Pth5, Pth6],（-∞, Pth5)、 (Pth6, Pth7]；, will be in the alternative scope of power when the reference modulation form being pre-selected is 64QAM forms（0.8, 1.2) The power threshold of interior determination is less than Pth9 as the 8th critical value Pth8 and the 9th critical value Pth9, Pth8, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as the tenth critical value PthlO, by the alternative scope of power（1.2,1.4 the power threshold determined in) is as the 11st critical value Pthl l, and predetermined power scope is [Pth8, Pth9], [PthlO, Pthl 1].

The characteristic determination module 703 specifically for, using formula Ratiol=^ P ([Pthl, Pth2]) _ really

P ((- ∞, Pthl], (Pth2 ,+∞)) fixed first power distribution characteristic value of the orthogonal demodulation signal relative to reference modulation form 16QAM

Ratiol, wherein, P ([Pthl, Pth2]) is that the normalized power of symbol in the orthogonal demodulation signal falls

Probability in [Pthl, Pth2], P ((- ∞, Pthl], (Pth2 ,+∞)) fall for the normalized power of symbol in the orthogonal demodulation signal（- ∞, Pthl] or（Pth2 ,+∞) in probability；Using formula Rati.2 =^P([^Pth4,^+∞)) determine

P ([Pth3, Pth4)) second power distribution characteristic value Ratio2 of the orthogonal demodulation signal relative to reference modulation form 256QAM, wherein, P ([Pth4 ,+∞):Normalized power for symbol in the orthogonal demodulation signal falls in [Pth4, + ∞) in both rates, P ([Pth3, Pth4)) be symbol in the orthogonal demodulation signal normalized power fall [Pth3, Pth4) in probability；Using formula Rati.3=--- Ρ (6]) --- determine described orthogonal

P ((- ∞, Pth5), (and Pth6, Pth7]) threeth power distribution characteristic value Ratio3 of the modulated signal relative to reference modulation form 32QAM, wherein,

P ([Pth5, Pth6]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth5, Pth6] in probability, P ((- ∞, Pth5)) is that the normalized power of symbol falls in the orthogonal demodulation signal（- ∞, Pth5) in probability, P ((Pth6, Pth7]) is that the normalized power of symbol in the orthogonal demodulation signal falls（Pth6, Pth7] in probability；Using formula Rati.4 =^P([Pth8'^Pth9])Determine the orthogonal demodulation signal relative to benchmark

P ([PthlO, Pthl l]) modulation format 64QAM the 4th power distribution characteristic value Ratio4, wherein, P ([Pth8, Pth9]) fall the probability in [Pth8, Pth9], P ([PthlO for the normalized power of symbol in the orthogonal demodulation signal, Pthll]) fall the probability in [Pthl 0, Pthl 1] for the normalized power of symbol in the orthogonal demodulation signal.

Described device also includes：Thresholding setup module 706, makes for default^{P(Afthl) |A) + P(B(thl)B)}Maximum the first thresholding of value Value thl, wherein：P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；P (B (thl) | B) it is that, when known B signal is not the signal of QPSK forms, the Ratici of B signal is less than thi probability；It is default to make^{P Wh2})l ^A)₂ ^{+ P}(^B(^{th2) B}) maximum the second threshold value th2 of value, wherein：P (A (th2) | A) it is that the Ratio2 of A signals is not less than th2 probability when known a-signal is 256QAM forms or the signal of 64QAM forms and the Ratici of A signals is less than thl；When the Ratiol of signal and B signal is less than thl, the Ratio2 of B signal is less than th2 probability；It is default to make_{P (}A(_th3)|_{A) 2+ P (B(th3)B)}Maximum the 3rd threshold value of value_&3, wherein：_p(^_{th3)| A)}For when known

A-signal is for the signal of 256QAM forms and when the Ratiol of a-signal is less than thl, the Ratio2 of a-signal is not less than th2, and the Ratio4 of a-signal is not less than th3 probability；P (B (th3) | B) be when the signal and the Ratiol of B signal that known B signal is 64QAM forms are less than thl, the Ratio2 of B signal is not less than th2,

The Rati of B signal₀4 are less than th3 probability；The 4th maximum threshold value th4 of the default value made, wherein：P (A (th4) | A) it is that the Ratio3 of a-signal is not less than th4 probability when known a-signal is 32QAM forms or the signal of 128QAM forms and the Ratiol of a-signal is less than thl, the Ratio2 of a-signal is less than th2；P (B (th4) | B) it is that the Ratio3 of B signal is less than th4 probability when the signal and the Ratiol of B signals that known B signal is 16QAM forms are less than thl, the Ratio2 of B signal is less than th2；It is default to make^P(A(th5)^|A) ^{+ P}(^Bfth5)^B) maximum the 5th threshold value th5 of value, wherein:P (A (th5) |) is that the Ratio3 of a-signal is not less than th5 probability when the signal and the Ratiol of a-signal that known a-signal is 32QAM forms are less than thl, the Ratio2 of a-signal is less than th2, the Ratio3 of a-signal is not less than th4；P (B (th5) | B) be when the signal and the Ratiol of B signal that known B signal is 128QAM forms be less than thl,

When the Ratio2 of B signal is less than th2, the Ratio3 of B signal is not less than th4, the Ratio3 of B signal is less than th5 probability.

The identification module 704 is specifically for when the Ratiol is not less than thl, determining the positive intermodulation Probability.

The identification module 704 is specifically for when the Ratol is not less than tM, the modulation format for determining the orthogonal demodulation signal is QPSK forms；When the Ratol is less than tM and Rat₀2 not less than 2 and not less than t/ β when, determine the orthogonal demodulation signal modulation format be 256QAM forms；When the Ratol is less than tM and Rato2 is not less than t/2 and Rat is less than t/When 3, the modulation format for determining the orthogonal demodulation signal is 64QAM forms；When the Ratol is less than tM and Rat₀2 are less than t/2 and Rat₀3 are not less than tM and Rat₀3 are not less than t/When 5, the modulation format for determining the orthogonal demodulation signal is 32QAM forms；When the Ratol is less than M, 3. Ratio!It is not less than tM and Rat less than thl, 3.Ratio3₀3 are less than t/When 5, the modulation format for determining the orthogonal demodulation signal is 128QAM forms；When the Rat ol are less than M, Ratio!Less than thl, Ratio, during less than th4, the modulation format for determining the orthogonal demodulation signal is 16QAM forms.

Specifically, the device of the modulation format of the above-mentioned identification orthogonal demodulation signal as shown in Fig. 7 can be located in digital signal processor.The digital signal processor can be located in receiver, including the structural representation of the receiver of the digital signal processor is as shown in Figure 8.

Fig. 8 is receiver structure schematic diagram provided in an embodiment of the present invention, including optical-electrical converter 801, digital analog converter 802 and digital signal processor 803, wherein：

Optical-electrical converter 801 is used to the optical signal received carrying out polarization beam splitting, and the two ways of optical signals after polarization beam splitting is carried out into 90 degree of Frequency mixing processings, then the optical signal after Frequency mixing processing is converted into analog electrical signal, and exports to digital analog converter 802;

Digital analog converter 802 is used to the analog electrical signal received being converted to digital electric signal, and exports to digital signal processor 803;

Digital signal processor 803 includes dispersion compensation module 8031, polarization demultiplexing module 8032, the device 8033 of the modulation format of identification orthogonal demodulation signal, frequency deviation estimating modules 8034, carrier phase estimation module 8035, judging module 8036;

Dispersion compensation module 8031 is used for the digital electric signal for receiving the output of digital analog converter 802, and the digital electric signal is carried out into dispersion compensation, and exports to polarization demultiplexing module 8032;

Polarization demultiplexing module 8032 is used to the digital electric signal received carrying out polarization demultiplexing processing, The method for recognizing the modulation format of orthogonal demodulation signal, the modulation format of the digital electric signal to receiving is identified；

Frequency deviation estimating modules 8034 are used for the recognition result of the device 8033 of the modulation format according to identification orthogonal demodulation signal, and the frequency deviation to digital electric signal is estimated and compensated, and is exported to carrier phase estimation module 8035;

Carrier phase estimation module 8035 is used for the recognition result of the device 8033 of the modulation format according to identification orthogonal demodulation signal, and the digital electric signal after compensating frequency deviation carries out carrier phase difference and estimated and compensated, and exports to judging module 8036;

Judging module 8036 is used for the recognition result of the device 8033 of the modulation format according to identification orthogonal demodulation signal, and the digital electric signal received is converted into corresponding binary code and exported.

Specifically, above-mentioned digital signal processor 803 can be used（DigitalSignalProcessing, DSP) chip realization, above-mentioned receiver as shown in Figure 8 can be coherent receiver.

Fig. 9 is the identifying device hardware architecture diagram of the modulation format of identification orthogonal demodulation signal provided in an embodiment of the present invention, is specifically included：Processor 901, memory 902, communication interface 903 and bus 904.Processor 901, memory 902, communication interface 903 are connected with each other by bus 904.

Bus 904 can be divided into address bus, data/address bus, controlling bus etc., for ease of representing, only be represented in Fig. 9 with a thick line, it is not intended that only one bus or a type of bus.

Communication interface 903, for receiving orthogonal demodulation signal.

Memory 902, for depositing program.Specifically, program can include program code, and described program code includes computer-managed instruction.Memory 902 may include high-speed random access memory（Random access memory, cylinder claims RAM) memory, it is also possible to also including nonvolatile memory（Non- volatile memory), for example, at least one disk deposits 4 all devices.

Processor 901 performs the program that memory 902 is deposited, for realizing data migration method provided in an embodiment of the present invention, including：

The symbol sebolic addressing of orthogonal demodulation signal to being received by communication interface 903 carries out power normalization processing, obtains the respective normalized power of multiple symbols that symbol sebolic addressing is included；

Multiple power brackets are preset, according to the normalized power of the multiple symbol of determination, it is determined that described The normalized power of multiple symbols falls the probability in the multiple power bracket, wherein, the multiple power bracket is according to the multiple reference modulation format settings being pre-selected；

The embodiment of the present invention provides a kind of method and device for the modulation format for recognizing orthogonal demodulation signal, it is determined that multiple respective normalized powers of symbol in the symbol sebolic addressing of the orthogonal demodulation signal received, and determine that the normalized power of the plurality of symbol falls the probability in each default power bracket, the power distribution characteristic value of the orthogonal demodulation signal is determined therefrom that, the modulation format of the orthogonal demodulation signal is determined according to the comparative result of the power distribution characteristic value of determination and default multiple threshold values.The above method can avoid the influence of frequency deviation and phase noise to recognition result, and the accuracy of identification format modulation signal can be effectively improved in the system that EON etc. has larger frequency deviation and phase noise by applying.

It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program product.Therefore, the form of the embodiment in terms of the application can use complete hardware embodiment, complete software embodiment or combine software and hardware.Moreover, the application can be used (includes but is not limited to magnetic disk storage, CD-ROM, optical memory etc. in one or more computer-usable storage mediums for wherein including computer usable program code）The form of the computer program product of upper implementation.

In a typical configuration, computing device includes one or more processors（CPU), input/output interface, network interface and internal memory.

Internal memory potentially includes the volatile memory in computer-readable medium, the form, such as read-only storage such as random access memory (RAM) and/or Nonvolatile memory（) or flash memory ROM（flash RAM).Internal memory is the example of computer-readable medium.

Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be realized that information is stored by any method or technique.Information can be computer-readable instruction, data structure, the module of program or other data.The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), dynamic random access memory（DRAM)、 Other kinds of random access memory（RAM), read-only storage（ROM), Electrically Erasable Read Only Memory（EEPROM), fast flash memory bank or other memory techniques, read-only optical disc read-only storage（CD-ROM), digital versatile disc（DVD) or other optical storages, magnetic cassette tape, the storage of tape magnetic rigid disk or other magnetic storage apparatus or any other non-transmission medium, the information that can be accessed by a computing device available for storage.Defined according to herein, computer-readable medium does not include the data-signal and carrier wave of non-temporary computer readable media (transitory media), such as modulation.

The application is with reference to method, the equipment according to the embodiment of the present application（System）And the flow chart and/or block diagram of computer program product are described.It should be understood that can by the flow in each flow and/or square frame and flow chart and/or block diagram in computer program instructions implementation process figure and/or block diagram and/or square frame combination.These computer program instructions can be provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices to produce a machine so that produce the device for being used for realizing the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames by the instruction of the computing device of computer or other programmable data processing devices.

These computer program instructions may be alternatively stored in the computer-readable memory that computer or other programmable data processing devices can be guided to work in a specific way, so that the instruction being stored in the computer-readable memory, which is produced, includes the manufacture of command device, the command device realizes the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices, so that series of operation steps is performed on computer or other programmable devices to produce computer implemented processing, so that the instruction performed on computer or other programmable devices provides the step of being used to realize the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.

Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creative concept, then other change and modification can be made to these embodiments.So, appended claims are intended to be construed to include preferred embodiment and fall into having altered and changing for the application scope.

Obviously, those skilled in the art can to the embodiment of the present application carry out it is various change and modification without Depart from the spirit and scope of the embodiment of the present application.So, if these modifications and variations of the embodiment of the present application belong within the scope of the application claim and its equivalent technologies, then the application is also intended to comprising including these changes and modification.

Claims

Claim

1st, a kind of method for the modulation format for recognizing orthogonal demodulation signal, it is characterised in that including：Power normalization processing is carried out to the symbol sebolic addressing of the orthogonal demodulation signal of reception, the respective normalized power of multiple symbols that symbol sebolic addressing is included is obtained；

According to the normalized power of the multiple symbol of determination, determine that the normalized power of the multiple symbol falls the probability in default multiple power brackets, wherein, default multiple power brackets are according to the multiple reference modulation format settings being pre-selected；

Fall the ratio of the probability in the multiple power bracket according to the normalized power of the multiple symbol, determine the power distribution characteristic value of the orthogonal demodulation signal；

The power distribution characteristic value of determination and default multiple threshold values are compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

2nd, the method as described in claim 1, it is characterised in that the symbol sebolic addressing of the orthogonal demodulation signal of described pair of reception carries out power normalization processing, obtains the respective normalized power of multiple symbols that symbol sebolic addressing is included, specifically includes：

According to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, the power average value of the multiple symbol is determined；

For each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

3rd, the method as shown in claim 1 or 2, characterized in that, the modulation format of the orthogonal demodulation signal is one kind in QPSK QPSK forms, 16 quadrature amplitude modulation QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms.

4th, method as claimed in claim 3, it is characterised in that preset multiple power brackets, specifically include：

Multiple reference modulation forms are selected in advance in each modulation format, and the alternative scope of multiple power is preset according to each reference modulation form of selection；

According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power； According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR；

According to default any alternative scope of power under the reference modulation format condition, it is determined that meeting formula df/du_thU when=0_thAs the power threshold determined in the alternative scope of the power, wherein, f=∑ [Ρ (Ε₄ ) f ^+∞ w₄ (u)du] + [ pCEj ) ί^¾ _Wj(u) du)], for i-th of benchmark normalized power for being less than minimum value in the alternative scope of the power of determination, the probability for the symbol that p (Ei) is ^ for emergent power in the ideally reference modulation form, Ε " is j-th of the benchmark normalized power for being more than maximum in the alternative scope of the power determined, and p (Ej) is Ε " for emergent power in the ideally reference modulation form

Wj (u)=sound work(

Rate, 1.（）For first kind modified Bessel function,_Wl(u) to be less than probability distribution of i-th of the benchmark normalized power of minimum value in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination,_Wj(u) to be more than probability distribution of j-th of benchmark normalized power under the conditions of the default OSNR of maximum in the alternative scope of the power in the reference modulation form that determines；

According to each power threshold predetermined power scope of determination.

5th, method as claimed in claim 4, it is characterised in that when the reference modulation form being pre-selected is 16QAM forms, the default alternative scope of power is（0.2,1.0) and（1.0, 1.8 );

When the reference modulation form being pre-selected is 256QAM forms, the default alternative scope of power is (1.8,2.0) and (2.1,2.3);

When the reference modulation form being pre-selected be 32QAM forms when, the default alternative scope of power be (0.1,0.5),（0.5,0.9) and（0.9, 1.3 );

When the reference modulation form being pre-selected is 64QAM forms, the default alternative scope of power is (0.8, 1.2)、（) and (1.2,1.4) 0.6,0.8.

6th, method as claimed in claim 5, it is characterised in that each power threshold predetermined power scope according to determination, is specifically included：

, will be in the alternative scope of power when the reference modulation form being pre-selected is 16QAM forms（0.2,1.0 the power threshold determined in) is as the first critical value ^l, by the alternative scope of power（0.2,1.0 the power threshold determined in) as the second critical value Pth2, predetermined power scope be [PtM tM], (- oo, t), (t/2,+oo) ;

, will be in the alternative scope of power when the reference modulation form being pre-selected is 256QAM forms（1.8,2.0) power threshold determined in regard the power threshold determined in the alternative scope of power (2.1,2.3) as the 4th critical value Ρ Μ as three critical values/^ 3, predetermined power scope for [PtM ,+oo), Pth PtM)；

, will be in the alternative scope of power when the reference modulation form being pre-selected is 32QAM forms（0.1,0.5 the power threshold determined in) is as the 5th critical value by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value ^6, by the alternative scope of power（0.9,1.3 the power threshold determined in) is used as the 7th critical value Pt/7, predetermined power scope be [^5, ^6], (~ ο ο, (Pth6, Pthiy, when the reference modulation form being pre-selected be 64QAM forms when, will be in the alternative scope of power（0.8,1.2 the power threshold determined in) is less than Pth9 as the 8th critical value 7^8 and the 9th critical value 7^8, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as ten critical values/^ 10, by the alternative scope of power（1.2,1.4 the power threshold determined in) is as 11 critical values/^11, and predetermined power scope is | t/z8, Pth9], [Pthl 0, Pthl 1].

7th, method as claimed in claim 6, it is characterised in that determine the power distribution characteristic value of the orthogonal demodulation signal, specifically include：

Using formula RatM=^ P ([Pth Pth2 }) _ determine the orthogonal demodulation signal relative to benchmark

>((- ∞, Pth Pthl, + ∞)) modulation format 16QAM the first power distribution characteristic value Ratol, wherein, Ρ ([Α Μ, Ρ 2]) fall the probability in [Pthl, Pth2] for the normalized power of symbol in the orthogonal demodulation signal P ((- ∞, Pthl], (Pth2 ,+∞)) fall for the normalized power of symbol in the orthogonal demodulation signal（- ∞, Pthl] or（Pth2 ,+∞) in both rates；

Using formula Rati.2 =^P([^Pth4,^+∞)) determine the orthogonal demodulation signal relative to reference modulation lattice

P ([Pth3, Pth4)) formula 256QAM the second power distribution characteristic value Ratio2, wherein, P ([Pth4, + ∞)) be the orthogonal demodulation signal in symbol normalized power fall [Pth4 ,+∞) in probability, P ([Pth3, Pth4)) be the orthogonal demodulation signal in symbol normalized power fall [Pth3, Pth4) in probability；

Using formula RaticS ,=--- P ([Pth5, Pth6]) _ determines the orthogonal demodulation signal relative to base

P((-∞,Pth5), (Pth6,Pth7];Quasi- modulation format 32QAM the 3rd power distribution characteristic value Ratio3, wherein, P ([Pth5, Pth6]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth5, Pth6] in probability, P ((- ∞, Pth5)) is that the normalized power of symbol in the orthogonal demodulation signal falls（- ∞, Pth5) in probability, P ((Pth6, Pth7]) is that the normalized power of symbol in the orthogonal demodulation signal falls（Pth6, Pth7] in probability；

Using formula Rati.4 =^P([Pth8,^Pth9])Determine the orthogonal demodulation signal relative to reference modulation

P ([PthlO, Pthl l]) form 64QAM the 4th power distribution characteristic value Ratio4, wherein, P ([Pth8, Pth9]) fall the probability in [Pth8, Pth9], P ([PthlO for the normalized power of symbol in the orthogonal demodulation signal, Pthll]) fall the probability in [PthlO, Pthl 1] for the normalized power of symbol in the orthogonal demodulation signal.

8th, method as claimed in claim 7, it is characterised in that preset multiple threshold values, specifically include：It is default to make P (dimension l) | A)₂₊ P(B₍tM_)B)Maximum the first threshold value of value_Μ, wherein：

P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；

P (B (thl) | B) it is that, when known B signal is not the signal of QPSK forms, the Ratiol of B signal is less than thl probability；

It is default to make P (dimensions²)|A)₂₊The second maximum threshold value of P Array value_th2, wherein：

P (A (th2) | A) it is when the signal and A that known a-signal is 256QAM forms or 64QAM forms When the Ratiol of signal is less than thl, the Ratio2 of a-signal is not less than th2 probability；

P (B (th2) | B) it is that the Ratio2 of B signal is less than th2 probability when known B signal is 32QAM forms or the signal of 128QAM forms or 16QAM forms and the Ratiol of B signal is less than thl；

The 3rd maximum threshold value of the default value for making P (A (th3) | A) ÷ P (B (th3) B), wherein：

P (A (th3) |) is that the Ratio4 of a-signal is not less than th3 probability when the signal and the Ratiol of a-signal that known a-signal is 256QAM forms are less than thl, the Ratio2 of a-signal is not less than th2；

P (B (th3) | B) it is that the Ratio4 of B signal is less than th3 probability when the signal and the Ratiol of B signal that known B signal is 64QAM forms are less than thl, the Ratio2 of B signal is not less than th2；

It is default to make P (^4) | A)₂₊The 4th maximum threshold value of P (B (th4) B) value_tM, wherein：

P (A (th4) | A) it is that the Ratio3 of a-signal is not less than th4 probability when known a-signal is 32QAM forms or the signal of 128QAM forms and the Ratiol of A signals is less than thl, the Ratio2 of a-signal is less than th2；

P (B (th4) | B) it is that the Ratio3 of B signal is less than th4 probability when the signal and the Ratiol of B signal that known B signal is 16QAM forms are less than thl, the Ratio2 of B signal is less than th2；

The 5th maximum threshold value of the default value for making P (A (th5) | A) ÷ P (B (th5) B)_th5, wherein：

P (A (th5) | A) it is that the Ratio3 of a-signal is not less than th5 probability when the signal and the Ratiol of a-signal that known a-signal is 32QAM forms are less than thl, the Ratio2 of a-signal is less than th2, the Ratio3 of a-signal is not less than th4；

P (B (th5) | B) it is that the Ratio3 of B signal is less than th5 probability when the signal and the Ratiol of B signal that known B signal is 128QAM forms are less than thl, the Ratio2 of B signal is less than th2, the Ratio3 of B signal is not less than th4.

9th, method as claimed in claim 8, it is characterised in that the power distribution characteristic value of determination and default multiple threshold values are compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result, is specifically included： When the Ratiol is not less than thl, the modulation format for determining the orthogonal demodulation signal is QPSK forms；

When the Ratiol is less than thl and 110 2 are not less than th3 not less than 1112 and Ratio 4, the modulation format for determining the orthogonal demodulation signal is 256QAM forms；

When the Ratiol is less than thl and 110 2 are less than th3 not less than 1112 and Ratio 4, the modulation format for determining the orthogonal demodulation signal is 64QAM forms；

It is less than th2 and when Ratio3 is not less than th5 not less than th4 and Ratio3 when the Ratiol is less than thl and Ratio2, the modulation format for determining the orthogonal demodulation signal is 32QAM forms；

It is less than th2 and when Ratio3 is less than th5 not less than th4 and Ratio3 when the Ratiol is less than thl and Ratio2, the modulation format for determining the orthogonal demodulation signal is 128QAM forms；

It is less than th2 and when Ratio 3 is less than th4 when the Ratiol is less than thl and Ratio 2, the modulation format for determining the orthogonal demodulation signal is 16QAM forms.

10th, a kind of device for the modulation format for recognizing orthogonal demodulation signal, it is characterised in that including：Power determination module, the symbol sebolic addressing for the orthogonal demodulation signal to reception carries out power normalization processing, obtains the respective normalized power of multiple symbols that symbol sebolic addressing is included；

Probability determination module, normalized power for the multiple symbol according to determination, determine that the normalized power of the multiple symbol falls the probability in default multiple power brackets, wherein, default multiple power brackets are according to the multiple reference modulation format settings being pre-selected；

Characteristic determination module, the ratio for falling the probability in the multiple power bracket according to the normalized power of the multiple symbol, determines the power distribution characteristic value of the orthogonal demodulation signal；

Identification module, for the power distribution characteristic value of determination and default multiple threshold values to be compared, the modulation format of the orthogonal demodulation signal is determined according to comparative result.

11st, device as claimed in claim 10, it is characterised in that the power determination module is specifically for according to the power of the multiple symbols included in the symbol sebolic addressing of the orthogonal demodulation signal, determining the power average value of the multiple symbol；For each symbol included in the symbol sebolic addressing, the power of the symbol and the ratio of the power average value are determined, the normalized power of the symbol is used as.

12nd, the device as described in claim 10 or 11, it is characterised in that the orthogonal demodulation signal Modulation format be QPSK QPSK forms, 16 quadrature amplitude modulation QAM forms, 32QAM forms, 64QAM forms, 128QAM forms, 256QAM forms in one kind.

13rd, device as claimed in claim 12, it is characterised in that described device also includes：Power bracket setup module, the alternative scope of multiple power is preset for selecting multiple reference modulation forms in each modulation format in advance, and according to each reference modulation form of selection；According to any reference modulation form of selection, it is determined that under unglazed noise situations in the reference modulation form each symbol benchmark normalized power；According to any benchmark normalized power of determination, the probability distribution of the benchmark normalized power in the reference modulation form is determined under the conditions of default OSNR；According to default any alternative scope of power under the reference modulation format condition, it is determined that meet formula #/_ίΑWhen=0 as the power threshold determined in the alternative scope of the power, wherein, f=∑) [^∞ ^ ( )du\ + X [p(E_j ) w_J(u) du)], it is less than power t for determination^hI-th of benchmark normalized power of minimum value in the alternative scopes of j, is that ideally emergent power is E in the reference modulation form_tSymbol probability, ^ is j-th of benchmark normalized power for being more than maximum in the alternative scope of the power for determining, is ideally emergent power in the reference modulation form

Sound work(

Rate ,/.（）For first kind modified Bessel function,_w) to be less than probability distribution of the i-th benchmark normalized power of minimum value in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination, to be more than probability distribution of j-th of the benchmark normalized power of maximum in the alternative scope of the power under the conditions of the default OSNR in the reference modulation form of determination；According to each power threshold predetermined power scope of determination.

14th, device as claimed in claim 13, it is characterised in that the power bracket setup module tool Body is used for, and when the reference modulation form being pre-selected is 16QAM forms, the default alternative scope of power is（0.2,1.0) and（1.0, 1.8);When the reference modulation form being pre-selected is 256QAM forms, the default alternative scope of power is（1.8,2.0) and（2.1, 2.3);When the reference modulation form being pre-selected is 32QAM forms, the default alternative scope of power is（0.1,0.5), (0.5,0.9) and（0.9, 1.3);When the reference modulation form being pre-selected be 64QAM forms when, the default alternative scope of power be (0.8,1.2),（) and (1.2,1.4) 0.6,0.8.

15th, device as claimed in claim 14, it is characterised in that the power bracket setup module specifically for, when the reference modulation form being pre-selected be 16QAM forms when, will be in the alternative scope of power

The power threshold determined in (0.2,1.0) is as the first critical value Pthl, using the power threshold determined in the alternative scope of power (0.2,1.0) as the second critical value Pth2, predetermined power scope be [PtM, Pth2],

(-00, Pthl), (Pth2,+∞);, will be in the alternative scope of power when the reference modulation form being pre-selected is 256QAM forms（1.8,2.0 the power threshold determined in) is as the 3rd critical value Pth3, by the alternative scope of power（2.1,2.3 the power threshold determined in) as the 4th critical value Pth4, predetermined power scope for [Pth4 ,+∞), [Pth3, Pth4);, will be in the alternative scope of power when the reference modulation form being pre-selected is 32QAM forms（0.1,0.5 the power threshold determined in) is as the 5th critical value Pth5, by the alternative scope of power（0.5,0.9 the power threshold determined in) is as the 6th critical value Pth6, by the alternative scope of power（0.9,1.3 the power threshold determined in) is as the 7th critical value Pth7, and predetermined power scope is [Pth⁵,Pth⁶]、 (-∞,Pth5) , (Pth6,Pth7];When the reference modulation form being pre-selected is 6⁴, will be in the alternative scope of power during QAM forms（0.8,1.2 the power threshold determined in) is less than Pth9 as the 8th critical value Pth8 and the 9th critical value Pth9, Pth8, by the alternative scope of power（0.6,0.8 the power threshold determined in) is as the tenth critical value PthlO, by the alternative scope of power（1.2,1.4 the power threshold determined in) is as the 11st critical value Pthl 1, and predetermined power scope is [Pth8, Pth9], [PthlO, Pthl 1].

16th, device as claimed in claim 15, it is characterised in that the characteristic determination module is specifically for using formula Rati.L=^ P ([Pthl, Pth2]) _ determine the orthogonal demodulation signal relative to benchmark

∞, Pthl], (Pth2, + ∞)) modulation format 16QAM the first power distribution characteristic value Ratiol, wherein, P ([Pthl, Pth2]) falls in [P t li for the normalized power of symbol in the orthogonal demodulation signal, probability in P P ((- ∞, Pthl], (Pth2 ,+∞)) fall for the normalized power of symbol in the orthogonal demodulation signal（- ∞, Pthl] or (Pth2,_+∞) in probability；Using formula Rati.2 =^P([^Pth4,^+∞)) determine the orthogonal demodulation signal phase

P ([Pth3, Pth4)) for reference modulation form 256QAM the second power distribution characteristic value Ratio2, wherein, P ([Pth4, + ∞)) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth4, + ∞) in probability

P ([P t IB, P t be the orthogonal demodulation signal in symbol normalized power fall [Pth3, Pth4) in probability；Using formula Rati.3=--- P ([Pth5, Pth6]) --- determines the orthogonal demodulation signal relative to benchmark

P ((- ∞, Pth5), (Pth6, Pth7]) modulation format 32QAM the 3rd power distribution characteristic value Ratio3, wherein, P ([Pth5, Pth6]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth5, Pth6] in probability, P ((- ∞, Pth5)) is that the normalized power of symbol falls in the orthogonal demodulation signal（- ∞, Pth5) in probability, P ((Pth6, Pth⁷]) fall for the normalized power of symbol in the orthogonal demodulation signal（Pth6, Pth7] in probability；Using formula

Ratio4 = ^P([Pth8'^Pth9])Determine the orthogonal demodulation signal relative to reference modulation form 64QAM's

P ([PthlO, Pthl 1]) the 4th power distribution characteristic value Ra_ti₀4, wherein, P ([Pth8, Pth9]) fall for the normalized power of symbol in the orthogonal demodulation signal in [Pth8, Pth9] in probability, P ([PthlO, Pthll]) is that the normalized power of symbol in the orthogonal demodulation signal falls the probability in [Pthl 0, Pthl 1].

17th, device as claimed in claim 16, it is characterised in that described device also includes：Thresholding setup module, makes for default^{P(A(thl)| A)+ P(B(thl)B)}Maximum the first threshold value thl of value, wherein：P (A (thl) |) is that, when known a-signal is the signal of QPSK forms, the Ratiol of a-signal is not less than thl probability；P (B (thl) | B) it is the Rat of B signal when known B signal is not the signal of QPSK forms_iolProbability less than thi；It is default to make^{P h2})l ^A)₂ ^{+ P}(^B(^{th2) B}) maximum the second threshold value th2 of value, wherein：P (A (th2) | A) it is that the Ratio2 of A signals is not less than th2 probability when known a-signal is 256QAM forms or the signal of 64QAM forms and the Ratid of A signals is less than thl；When the Ratiol of signal and B signal is less than thl, the Ratio2 of B signal is less than th2 probability；It is default to make p_{A_{m) \A_{) +} B_{M) B) maximum the 3rd threshold value of value, wherein：_{Ρμ 3)μ)}For when known

Α signals is the signals of 256QAM forms and the Ratol of a-signal is less than tM, the Rat of a-signal₀2 are not less than t/When 2, the RaticA of a-signal is not less than t/The both rate of the 4 of 3；Ρ ((^3) |) is when known B signal is

The signal of 64QAM forms and the Ratio of B signal when being not less than less than tM, the Ratiol of B signal,

The R of B signal is less than t/ β probability；It is default make Ρ (^Μ) 1 + ^{P B th}Value it is maximum the 4th

2

Threshold value tM, wherein：P04 (tM) |) be when the signal and the Ratio of a-signal that known Α signals are 32QAM forms or 128QAM forms be less than tM, the Ratio2 of a-signal is less than t/When 2, the RatioS of a-signal is not less than tM probability；P ((tM) |) be when the signal and the Ratio of B signals that known B signal is 16QAM forms be less than tM, the Ratio2 of B signal is less than t/When 2, the Rat of B signal is less than the 4 of tM both rates；The 5th threshold value 5 for making ^ ^^^^ value maximum is preset, wherein：Ρ 04 (5) μ) it is when the signal and the Ratol of a-signal that known Α signals are 32QAM forms are less than tM, the Ratio2 of a-signal is less than t/2nd, when the RatioS of a-signal is not less than tM, the RatioS of a-signal is not less than th5 probability；P (B (th5) B) be when the signal and the Ratio of B signal that known B signal is 128QAM forms be less than M,

The Ratiol of B signal is less than t/2nd, when the Ratio2 of B signal is not less than tM, the probability that the Ratio2 of B signal is less than.

18th, device as claimed in claim 17, it is characterised in that the identification module is specifically for when the Ratol is not less than tM, the modulation format for determining the orthogonal demodulation signal is QPSK forms；When the Ratol, which is less than M and Ratio2, is not less than th3 not less than th2 and o4, the modulation format for determining the orthogonal demodulation signal is 256QAM forms；It is not less than and R when the Ratol is less than tM and Rato2_at ₀4 be less than t/ β when, determine the orthogonal demodulation signal modulation format be 64QAM forms；When the Ratiol is less than tM and Ratiol is less than t/When 2 and Ratio3 is not less than not less than tM and Ratio3, the modulation format for determining the orthogonal demodulation signal is 32QAM forms；When the Ratol is less than tM and Ratiol is less than t/2 and Ratio3 is not less than tM and Ratio3 ' }, in t/When 5, the modulation format for determining the orthogonal demodulation signal is 128QAM forms；When the Ratol is less than tM and Rat₀2 When being less than th4 less than th2 and Ratio3, the modulation format for determining the orthogonal demodulation signal is 16QAM forms.

19th, a kind of digital signal processor, it is characterised in that the device of the modulation format including the identification orthogonal demodulation signal as described in claim 10 ~ 18 is any.

20th, a kind of receiver, it is characterised in that the device of the modulation format including the identification orthogonal demodulation signal as described in claim 10 ~ 18 is any.