| 摘要 |
<p>Disclosed herein is a radio communications method that comprises generating, by a transmitter (7), a digital time signal, that is time-limited, carries a limited sequence of digital symbols to be transmitted and results from an approximation of the Hilbert transform in frequency domain; wherein said approximation is based on a frequency main mode, that is associated with an orbital angular momentum mode with topological charge equal to zero, and that includes main mode frequency samples carrying respective digital symbols of said limited sequence via said orbital angular momentum mode with topological charge equal to zero; said approximation being based also on one or more frequency twisted modes carrying the other digital symbols of said limited sequence; wherein each frequency twisted mode is associated with a corresponding orbital angular momentum mode with a respective topological charge different than zero, and includes respective twisted mode frequency samples carrying one or more respective digital symbols of said limited sequence via said corresponding orbital angular momentum mode with said respective topological charge different than zero. The method further comprises transmitting, by the transmitter (7), a radio frequency signal carrying the digital time signal generated. Moreover, the method comprises also carrying out, by a receiver (8), the following steps: receiving the radio frequency signal transmitted by the transmitter (7); processing the received radio frequency signal so as to obtain a corresponding incoming digital signal; and extracting, from the incoming digital signal, the digital symbols carried by said incoming digital signal.</p> |
