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Modulation format recognition method based on relative entropy calculation

A modulation format and recognition method technology, applied in the field of modulation format recognition based on relative entropy calculation, can solve the problems of high complexity and low robustness of modulation format recognition methods, achieve low OSNR, less calculation, and reduce complexity Effect

Active Publication Date: 2021-08-20
GUANGXI NORMAL UNIV +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the technical problem of high complexity and low robustness of the modulation format identification method existing in the prior art

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  • Modulation format recognition method based on relative entropy calculation
  • Modulation format recognition method based on relative entropy calculation
  • Modulation format recognition method based on relative entropy calculation

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Embodiment 1

[0035] This embodiment provides a modulation format identification method based on relative entropy calculation, the modulation format identification method based on relative entropy calculation, for identifying four modulation formats, including:

[0036] Step 1, perform signal normalization, calculate normalized power signal A 1 , A 2 , ..., A n ;

[0037] Step 2, divide the theoretical amplitude probability distribution of four modulation formats into three intervals, calculate the theoretical amplitude probability distribution of four modulation formats to {q QPSK_1 q QPSK_2 q QPSK_3 }, {Q 16QAM_1 q 16QAM_2 q 16QAM_3 }, {Q 32QAM_1 q 32QAM_2 q 32QAM_3 } And {q 64QAM_1 q 64QAM_2 q 64QAM_3 }

[0038] Step three, normalize the normalized power signal in step one 1 , A 2 , ..., A n The statistical count is performed in the three intervals in step II, calculate the amplitude probability distribution of the signal to be identified according to the statistical count result;

[0039] S...

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Abstract

The invention relates to a modulation format recognition method based on relative entropy calculation, and solves the technical problems of high complexity and low robustness. The method comprises the following steps: 1, carrying out signal normalization, and calculating a normalized power signal; 2, dividing the theoretical amplitude probability distributions of the four modulation formats into three intervals, and calculating the theoretical amplitude probability distributions of the four modulation formats; 3, respectively carrying out statistical counting on the normalized power signal in the step 1 in the three intervals, and calculating amplitude probability distribution of the signal to be identified according to a statistical counting result; 4, calculating the relative entropy of the probability distribution of the current signal relative to the four modulation formats as the KL of the signal to be identified; 5, according to the change function of the KL value along with the OSNR, determining an optimal determination KL value as a determination threshold value, and according to the determination threshold value and the KL value, determining a current modulation format technical scheme, so the problem is well solved, and the method can be used in modulation format identification.

Description

Technical field [0001] The present invention relates to the field of digital coherent reception in coherent light communication, and more particularly to a modulation format recognition method based on relative entropy calculation. Background technique [0002] With the rapid development of the Internet of Things, global communication has grown exponentially, and high requirements for optical communication networks, such as large transmission capacity, long distance, high spectral utilization. In order to improve the information transmission rate, improve spectral utilization, researchers put forward a variety of modulation formats that improve transport performance and spectral efficiency, including phase-phase keying (PSK), orthogonal adjustment (QAM), orthogonal frequency division multiplex (OFDM), etc. However, in the coherent transmission system, there are such as dispersion (CD), nonlinear effects, self-phase modulation effects (SPM), cross-phase modulation effect (XPM), po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61H04L27/00
CPCH04B10/61H04L27/0012
Inventor 李传起周鹏陆叶陈东张宇
Owner GUANGXI NORMAL UNIV