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In a series of fundamental proof-of-principle experiments, comprisingnumerical, controlled laboratory, and real-world experimentation, we have shownthat it is possible to use the angular momentum physical layer for radioscience and radio communication applications. Here we report a major, decisivestep toward the realization of the latter, in the form of the real-worldexperimental demonstration that a radio beam carrying orbital angular momentum(OAM) can readily be digitally phase shift modulated and that the informationthus encoded can be effectively transferred in free space to a remote receiver.The experiment was carried out in an urban setting and showed that theinformation transfer is robust against ground reflections and interfering radiosignals. The importance of our results lies in the fact that digital phaseshift keying (PSK) protocols are used in many present-day wirelesscommunication scenarios, allowing new angular momentum radio implementations touse methods and protocols that are backward compatible with existing linearmomentum ones.

Experimental demonstration of free-space information transfer using phase modulated orbital angular momentum radio