Modulation technique for transmitting and receiving radio vortices

摘要

A device for generating Orbital Angular Momentum (OAM) modes for radio communications. The device is designed to receive one or more input digital signals, each of which has a respective sampling period which is a respective multiple of a given sampling period, and occupies a frequency bandwidth which is a respective fraction of a given available frequency bandwidth. The device is operable to apply, to each input digital signal, a respective space modulation associated with a respective OAM mode having a respective topological charge to generate a corresponding digital signal carrying the respective OAM mode. The device is configured to apply, to each input digital signal, the respective space modulation by interpolating said input digital signal and phase-modulating the interpolated input digital signal so as to generate a corresponding phase-modulated digital signal carrying the respective OAM mode, having the given sampling period, and occupying the given available frequency bandwidth.

主权项

1. Device for generating Orbital Angular Momentum modes for radio communications, the device comprising:
at least one first circuit module configured to receive one or more input digital signals each of which: has a respective sampling period which is a respective multiple of a given sampling period; and occupies a frequency bandwidth, which is a respective fraction of a given available frequency bandwidth; the device further comprises second circuit modules configured to: apply, to each said respective input digital signal, a respective space modulation associated with a respective Orbital Angular Momentum mode having a respective topological charge to generate a corresponding modulated digital signal carrying said respective Orbital Angular Momentum mode; the respective space modulation comprises interpolating said respective input digital signal and phase-modulating the interpolated input digital signal so as to generate the corresponding phase-modulated digital signal carrying said respective Orbital Angular Momentum mode, having the given sampling period, and occupying the given available frequency bandwidth; and provide an output digital signal based on the modulated digital signal(s) for the radio communications.