LAUSR

In this letter, we investigate the outage constrained robust secure design in multiple-input multiple-output simultaneous wireless information and power transfer systems, where the energy receivers (ERs) may eavesdrop the confidential information sent to the desired receivers (DRs). Specifically, we propose a joint design of the precoding matrix and the power splitting (PS) ratios at the DRs to maximize the total harvested energy at the DRs, under the outage secrecy rate constraints at the DRs and the outage harvested energy constraints at the ERs. To solve the formulated non-convex maximize the sum of non-linear functions problem, we decouple the original problem into two sub-problems and propose an alternating optimization algorithm, wherein large deviation inequality and successive convex approximation are used to handle these sub-problems. Finally, numerical results are provided to validate our proposed algorithm.