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As an alternative to Radio-Frequency (RF) communications, Optical Wireless Communications (OWC) can support high data rates and low power operations while providing good jamming resistance. The authors' focus in this paper is on deep UltraViolet (UV) Outdoor Communications (UVOC) where solar blind and non-line-of-sight operations are attractive. Light beams from UV LED arrays serve as information carriers. In an abstract sense, this is similar to directional transmissions in RF; however, the PHY layer characteristics significantly differ due to atmospheric scattering. First, they perform extensive experiments on a UV testbed towards understanding signal propagation and the impact of the PHY on medium access.
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