Investigation of outage probability and channel capacity for atmospheric coherent laser communication
In the domain of atmospheric coherent laser communication,several factors such as channel loss,atmospheric turbulence,and pointing errors continually affect its performance.The fading distribution model of atmospheric channel un-der these composite effects is analyzed,and the closed-form solution of the outage probability and channel capacity is solved.The research concludes that,on the one hand,although the pointing error deteriorates the outage performance and channel capacity of the coherent laser communication system,it can be significantly reduced by controlling the pointing ac-curacy to the order of magnitude of ζ=1.4;on the other hand,although high-order adaptive optical compensation can better suppress the optical phase distortion introduced by atmospheric turbulence,low-order(J=3)adaptive optical compensation can significantly improve the outage probability and channel capacity.Therefore,in order to realize high-availability and high-capacity atmospheric coherent laser communication,low-order adaptive optical compensation and high-precision beam pointing and tracking should be jointly considered in system design.
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