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A Modulation Format Identification Method Based on Relative Entropy Calculation

A modulation format and identification method technology, applied in the field of modulation format identification based on relative entropy calculation, can solve the problems of high complexity and low robustness of the modulation format identification method, and achieve low OSNR, less calculation, and fewer samples little effect

Active Publication Date: 2022-08-05
GUANGXI NORMAL UNIV +1
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  • Description
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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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  • A Modulation Format Identification Method Based on Relative Entropy Calculation
  • A Modulation Format Identification Method Based on Relative Entropy Calculation
  • A Modulation Format Identification 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 is used to identify four modulation formats, and the method includes:

[0036] Step 1, normalize the signal, and calculate the normalized power signal A 1 ,A 2 ,…,A n ;

[0037] Step 2: Divide the theoretical amplitude probability distribution of the four modulation formats into three intervals, and calculate the theoretical amplitude probability distribution of the four modulation formats as {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 3, normalize the power signal A in step 1 1 ,A 2 ,…,A n , perform statistical counting in the three intervals in step 2, respectively, and calculate the amplitude probability distribution of the signal to be identified accord...

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Abstract

The invention relates to a modulation format identification method based on relative entropy calculation, which solves the technical problem of high complexity and low robustness. By adopting step 1, signal normalization is performed to calculate the normalized power signal; Step 2: Divide the theoretical amplitude probability distributions of the four modulation formats into three intervals, and calculate the theoretical amplitude probability distributions of the four modulation formats; Step 3: Divide the normalized power signals in Step 1 into three intervals Carry out statistical counting, and calculate the amplitude probability distribution of the signal to be identified according to the statistical counting result; step 4, calculate the relative entropy of the probability distribution of the current signal relative to the four modulation formats to be the KL of the signal to be identified; step 5, according to the KL value The change function of OSNR determines the best judgment KL value as the judgment threshold, and the technical scheme of judging the current modulation format according to the judgment threshold and the KL value solves this problem well and can be used in modulation format identification.

Description

technical field [0001] The invention relates to the field of digital coherent reception in coherent optical communication, in particular to a modulation format identification method based on relative entropy calculation. Background technique [0002] With the rapid development of the Internet of Things, the exponential growth of global communications has put forward high requirements for optical communication networks, such as large transmission capacity, long distance, and high spectral utilization. In order to increase the information transmission rate and improve spectrum utilization, researchers have proposed a variety of modulation formats that can improve transmission performance and spectrum efficiency, including Phase Shift Keying (PSK), Quadrature Amplitude Modulation (QAM), and Orthogonal Frequency Division Multiplexing. (OFDM) etc. However, in coherent transmission systems, there are phenomena such as chromatic dispersion (CD), nonlinear effects, self-phase modul...

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Application Information

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Patent Type & Authority Patents(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