Method for identifying subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence

A technology of wireless optical communication and atmospheric turbulence, which is applied in the field of communication, can solve the problems of low recognition rate of high-order modulation, and achieve the effect of simple technical route, easy implementation, and improved correct recognition rate

Inactive Publication Date: 2018-05-18
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a wireless optical communication subcarrier modulation constellation diagram identification method under atmospheric turbulence, which solves the problem of low high-order modulation recognition rate caused by atmospheric turbulent light intensity fluctuations

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  • Method for identifying subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence
  • Method for identifying subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence
  • Method for identifying subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The present invention provides a wireless optical communication subcarrier modulation constellation diagram identification method under atmospheric turbulence, such as figure 1 As shown, after the subcarrier MPSK modulated optical signal x(t) transmitted by the optical transmitter passes through the atmospheric turbulence channel, the constellation diagram recognition is performed on the receiver output y(t). Firstly, the fuzzy C-means clustering method is used to analyze the modulation signal constellation diagram through the atmospheric turbulence channel, to find the cluster center, and iteratively obtain the final membership matrix u ij , and then calculate the mean value of the clustering hard trend function according to the maximum value and the second maximum value of the membership degree matrix, as the characteristic parameter...

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Abstract

The invention discloses a method for identifying the subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence. The method comprises the following steps that: an atmospheric turbulence channel mathematical model is established; the constellation diagram of subcarrier modulation signals which have passes through an atmospheric turbulence channel is obtained according to the atmospheric turbulence channel mathematical model, fuzzy C-means clustering is performed, and the hard trend mean feature parameter of cluster centers is extracted; and an improved three-layer BP neural network classifier is designed, the feature parameter is adopted to train the improved BP network, and the trained network is adopted to identify the constellation diagram.The method for identifying the subcarrier modulation constellation diagram of the wireless optical communication under the atmospheric turbulence of the present invention has the advantages of simpletechnical routes, economical performance, high practicability, high feasibility and easiness in implementation. With the method adopted, the correct recognition rate of subcarrier high-order modulation under severe light intensity fluctuation caused by atmospheric turbulence can be improved, and the influence of the atmospheric turbulence on the detection of the constellation recognition can be well suppressed.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for identifying a subcarrier modulation constellation diagram of wireless optical communication under atmospheric turbulence. Background technique [0002] Wireless optical communication generally adopts intensity modulation / direct detection system, and intensity modulation can be divided into pulse modulation and continuous wave modulation. Subcarrier modulation is a continuous wave modulation. Compared with OOK modulation, subcarrier modulation can achieve the best error performance without adaptive threshold detection, and can effectively suppress the influence of atmospheric turbulence. Compared with PPM modulation, there is no need to increase system bandwidth requirements. Atmospheric channel is a time-varying channel with memory. Atmospheric scattering and atmospheric turbulence have a great influence on the constellation phase of the subcarrier...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06N3/08
CPCG06N3/084G06F18/2321G06F18/24
Inventor 陈丹黄根全王晨昊
Owner XIAN UNIV OF TECH
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