A survey on performance enhancement in FSO through spatial diversity and beamforming

Optical wireless communication (OWC) is widely referred to as free space optical (FSO) communication in literature. FSO systems have been found efficient in terms of bandwidth, capacity but suffers from a limitation of atmospheric turbulence. In this paper a survey has been presented on spatial diversity and beam forming techniques for mitigating the effect of atmospheric turbulence and fog in FSO in different channel models studied so far in literature. This paper discuss the BER, SNR for different channel models for diversity schemes at transmitter side, receiver side and at both the sides.