We have proposed a spatial diversity scheme to mitigate the influence of atmospheric turbulence on the system employing Orbital Angular Momentum (OAM) state. The results show that, in comparison with the system without diversity, the ratio of SNR tends to two in weak turbulent region, and the ratio tends to one as the strength of turbulence increases. The diversity scheme has efficiently mitigated the influence of atmospheric turbulence at weak turbulence.
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