Robust Security Transmission Scheme for SWIPT-Enable Heterogeneous Networks With RIS

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In this article, we investigate the robust and secure transmission design for multiple reconfigurable intelligent surfaces (RIS)-aided heterogeneous networks (HetNet). In particular, the macro base station (BS) serves multiple users, and the femto-BS transmits secure messages to the information receiver while ensuring the energy supply of the energy receivers (ERs). Considering the potential eavesdropping risk of ERs, the beamforming and artificial noise of the BSs and phase shifts of RISs are jointly optimized to minimize power consumption under imperfect all-link channel state information. For the complex probability constraints in the nonconvex problem, the permutation matrix and the Bernstein-type inequality are introduced to transform the constraints into a convex form. Further, the problem is decomposed into two subproblems, and the optimal solution is obtained through an alternating algorithm where the subproblems are solved by semidefinite relaxation. In addition, the rank-1 constraints are handled by recursive construction and compensation function based on first-order Taylor expansion. The simulation results verify that the proposed scheme can effectively reduce the required total power consumption while providing robust secure transmission and energy supplement in RISs-aided HetNet.

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