Design of Hybrid Beamforming for Mitigating Wave Disturbances in Marine Internet of Things

The Marine Internet of Things (MIoT) has attracted significant attention due to its critical importance. However, in Unmanned Aerial Vehicle (UAV)-assisted MIoT systems, beam misalignment caused by sea wave perturbations significantly degrades system performance. To address this challenge, this study focuses on the active hybrid beamforming design challenge, with sum-rate maximization as the objective in UAV-assisted multi-target MIoT systems under sea wave perturbations. Since the optimization problem is non-convex, this paper splits it into two procedures: firstly, a full-digital beamforming optimization is solved by the Semidefinite Relaxation (SDR) method; secondly, used the full-digital beamforming matrix, manifold optimization theory is applied to derive a suboptimal solution for the hybrid beamforming optimization problem. Simulation results validate the effectiveness and robustness of the proposed design method.