Method and system for transmitting and receiving an electromagnetic radiation beam with detection of orbital angular momentum and related telecommunication method and system

A method for transmitting and receiving an electromagnetic radiation beam, adapted to determine an orbital angular momentum of the received electromagnetic radiation beam, is described. There is further described a system for transmitting and receiving an electromagnetic radiation beam, capable of performing the aforesaid method. A method for performing a telecommunication of signals modulated according to any modulation technique and grouped by means of orbital angular momentum multiplexing is further described There is further described a telecommunication system capable of performing the aforesaid method for performing a telecommunication of modulated signals.