2021 Volume 10 Issue 8 Pages 605-610
Orbital Angular Momentum (OAM) is the intrinsic property of electromagnetic waves. Similar to the spectrum spread in the frequency domain, the OAM spread can be constructed in the OAM domain. In the Uniform Circular Array (UCA) scheme of OAM, the OAM spread turns out to be an efficient way of beam-forming to the propagation direction. In this paper, the system architecture of OAM spread transmission is highlighted with the Carrier Interferometry (CI) codes. Besides, the Multi-Loop UCA scheme combined with CI codes to generate multiple OAM modes is analyzed and evaluated. The simulation results show that the more OAM modes are multiplexed, the smaller the beam angle for beamforming. Correspondingly, the adjacent channel interference at the receiving end is smaller. In addition, the combination of OAM and Multi-Input Multi-Output (MIMO) with UCA scheme is expected to be applied in 6G.
