Offline MIMO Equalization of Atmospheric Turbulence on the Propagation of Light Carrying Orbital Angular Momentum

Guo Xinglan; Yin Xiaoli; Xin Xiangjun

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Offline MIMO Equalization of Atmospheric Turbulence on the Propagation of Light Carrying Orbital Angular Momentum

Guo Xinglan #,Yin Xiaoli,Xin Xiangjun *

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

*Correspondence author

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Funding: This work is supported by the National Natural Science Foundation of China （No.No.61575027 and No.61471051)）

Opened online:11 December 2015

Accepted by: none

Citation: Guo Xinglan,Yin Xiaoli,Xin Xiangjun.Offline MIMO Equalization of Atmospheric Turbulence on the Propagation of Light Carrying Orbital Angular Momentum[OL]. [11 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668529

We demonstrate crosstalk mitigation using 4 × 4 multiple-input-multiple-output (MIMO) equalization on an orbital angular momentum (OAM) multiplexed free-space data link in free-space optical communication links. For multiplexed OAM beams, atmospheric turbulence causes fluctuations of the received light signal, induces inter-channel crosstalk among each beam and degrades the signal performance, impairing link performance. We investigate its principle theoretically and verify it via simulation, the results demonstrate that with the assistance of MIMO processing, the Constellation diagram performance can be improved. Differernt MIMO equalization algorithms is compared, mathematical derivation and experimental simulation show that compared with CMA(Constant Modulus Algorithm), MCMA(modified Constant Modulus Algorithm) can improve the performance effectively and mitigate the channel crosstalk more effectively .

Keywords:Atmospheric turbulence;OAM;MIMO;CMA;MCMA;Blind equalization algorithm;

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