| The short-range, non-line-of-sight(NLOS) ultraviolet communication relies upon two related phenomena. The first is that atmospheric gases, particularly ozone and oxygen, are strong absorbers of light in the spectral region between 200nm to 280nm which is called "Solar-Blind Region", so that the solar radiation reaching the ground in this waveband is negligible. The second is that solar-blind UV generated at the earth's surface is strongly scattered. The physics of scattering is discussed and modeled. The Non-line-of-sight single-scatter propagation model is used to analyze the performance of NLOS UV communication system. The development of UV light sources and detectors is briefly summarized. A study of digital pulse interval modulation(DPIM) for UV communications is presented and The Pulse position Modulation(PPM) and DPIM are compared. Then PPM and DPIM are emulated by Simulink of Matlab. Finally, a test bed using C6416 DSK for evaluation NLOS UV communication hardware and modulation schemes is described. |
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