Optimal Power Allocation for Spatial Modulation in Cross-Media Communications

This paper explores the application of spatial modulation to a cross-media communication system. Specifically, based on the theoretical expression of the mutual information of spatial modulation, an optimization model to maximize the minimum mutual information in the uplink and downlink of the relay is proposed, along with a developed power allocation (PA) scheme. In addition, the simulation is operated under two cross-media communication scenarios to confirm the superiority and robustness of the proposed PA scheme. Finally, the simulation results confirm that the proposed PA scheme has better mutual information performance than that of the average PA scheme.