19 March 2013 Orthogonal on-off keying (O3K) for free-space laser communications
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Orthogonal On-Off Keying is a coded modulation technique, where the input digital signal is mapped into a block of orthogonal codes. The encoded data, which is in orthogonal space, modulates the laser beam by means of On-Off Keying. At the receiver, two photo cells are Cross Coupled to compensate the sunlight and other atmospheric noise. Since the laser beam is highly directional and can only be acquired by one photo cell, the input laser signal can then be received with little noise, and signal processing is made easier. These techniques are especially beneficial in high bandwidth, long distance secure laser communication applications, such as for use in Unmanned Aerial Vehicles.
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Saleh Faruque, Saleh Faruque, Shams Faruque, Shams Faruque, Tasbirun Nahian Upal, Tasbirun Nahian Upal, William Semke, William Semke, } "Orthogonal on-off keying (O3K) for free-space laser communications", Proc. SPIE 8610, Free-Space Laser Communication and Atmospheric Propagation XXV, 86100I (19 March 2013); doi: 10.1117/12.2002546; https://doi.org/10.1117/12.2002546

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