Effect of the beam divergence angle on receiving energy of UV-LED scattering communication
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1.
School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China
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Received Date:
2013-04-26
Accepted Date:
2013-05-12
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Abstract
According to transmission characteristics of optical energy in ultraviolet light-emitting diode(LED) scattering communication, the beam divergence angle has a certain influence on scattering link structure and received photon energy. The action effect of the beam and scatterers was strengthened with the transmit array composed by a plurality of LEDs. With the effects of different scattering on the beam divergence angle, the changing of the photon energy was analyzed. In order to study the UV communication performance more accurately, pulse modulation method and measures to increase the transmission power of UV scattering communication were studied, the solution of LED array driving circuit and the pulse position modulation (PPM) were given, scattering communication system transmission of UV-LED was tested outdoor. The experimental results showed that, in the short distance communication, large scattering angle made the light area of scatterers increase and more effective of scattering, the amount of photons arriving at receiving was increased. In the actual communication applications, the scattering optical communication was higher flexibility and real-time, appropriate optical processing can be used to optimize the structure of the optical path for increasing the transmission distance. The result provides a correct guidance for larger transmission distance and better transmission effect.
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