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
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[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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