  The orbital angular momentum (OAM) wireless communication technology is
widely studied in recent literatures. But the atmospheric turbulence is rarely
considered in analyzing the capacity of OAM-based millimeter wave (OAM-mmWave)
communication systems. The OAM-mmWave propagated in the atmosphere environments
is usually interfered by the atmospheric turbulence, resulting in the crosstalk
among OAM channels,capacity degradation, etc. By taking into account the
atmospheric turbulence effect, this paper proposes a new purity model and a new
capacity model for the OAM-mmWave communication systems. Simulation results
indicate that the OAM-mmWave propagation in the atmosphere environments is
evidently interfered by atmospheric turbulence, where the capacity of the
OAMmmWave communication systems decreases with the increase of the transmission
frequency.
