[SOLVED] Modulation Technique OOK and PPM

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Fovakis

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Ηi i am doing a project for free space optical communications. So i read that the most famous modulation is OOK and PPM. So, about OOK i understand it. For PPM it is a pulse modulation. The pulses propagate through the space ?????? without any optic carrier?

thanks a lot
 

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