Capacity Analysis and Improvement for OAM-MIMO in Typical Multipath Scenarios

Abstract

Orbital angular momentum (OAM) can provide an additional multiplexing degree in wireless communications. However, it suffers large propagation loss in the misalignment and rich-multipath scenarios. In this paper, the joint iterative power allocation and average phase compensation (IPA-APC) scheme is proposed to improve the performance of OAM-MIMO in street scenarios. On the one hand, the average phase compensation scheme improves the channel capacity as well as the phase deviations caused by misalignment and multipath; on the other hand, compared with the optimal power allocation (OPA) scheme, the proposed iterative power allocation scheme reduces the running time of the algorithm and ensures the capacity performance. Simulation results verify the superiority of the proposed scheme.