Diversity gains for MIMO wireless optical intensity channels with atmospheric fading and misalignment

A general channel model for multiple-input multiple-output (MIMO) free-space optical (FSO) communication systems impaired by atmospheric and misalignment fading is developed. The outage probability as a performance measure is derived and the diversity gain is analyzed. It is shown that the diversity gain is independent of the number of transmitters and receivers and only determined based on the misalignment parameters.