  Since the orthogonality of the line-of-sight multiple input multiple output
(LoS MIMO) channel is only available within the Rayleigh distance, coverage of
communication systems is restricted due to the finite implementation spacing of
antennas. However, media with different permittivity in the transmission path
are likely to loosen the requirement for antenna spacing. Such a conclusion
could be enlightening in an air-to-ground LoS MIMO scenario considering the
existence of clouds in the troposphere. To analyze the random phase variations
in the presence of a single-layer cloud, we propose and modify a new cloud
modeling method fit for LoS MIMO scene based on real-measurement data. Then,
the preliminary analysis of channel capacity is conducted based on the
simulation result.
