OAM beam and modal selection algorithm-based misalignment system

Orbital angular momentum (OAM), a new modulation degree of freedom, has the potential to significantly improve frequency spectrum. Alignment and static are, however, required for the OAM communication system based on uniform circular array (UCA), which is difficult to achieve. A beam selection scheme based on OAM is proposed and matching beam pair is obtained by beam scanning. To eliminate intermodal interference caused by misalignment, a modal selection algorithm is proposed. The simulation results demonstrate that the beam matching scheme can effectively address the issue of system performance degradation caused by misalignment. By selecting transmission modes, intermodal interference can be reduced.