Fluid Antennas Assisted RIS-NOMA Communication Networks
For wireless communication researchers, this work incrementally combines FAS with RIS-NOMA, showing throughput gains under specific conditions.
This paper integrates fluid antenna systems (FAS) into RIS-NOMA networks and proposes an iterative algorithm to maximize sum rate. Simulations show that FAS-RIS-NOMA achieves higher throughput than traditional antenna systems and OMA under high SNR, and sum rate increases with more RIS elements and larger FAS size.
This paper introduces a fluid antenna system (FAS) into reconfigurable intelligent surface (RIS) assisted non-orthogonal multiple access (NOMA) communication networks, where the non-orthogonal users are equipped with planar fluid antennas. Specifically, we formulate a sum rate maximization problem for FAS-RIS-NOMA networks, which jointly optimizes the fluid ports, the RIS deployment, and the phase shift matrix. To solve the resulting non-convex optimization problem involving highly coupled variables, an iterative algorithm based on alternating optimization is employed to decompose the original problem into three subproblems. Exhaustive search is employed for optimizing the fluid ports, particle swarm optimization is used for the RIS deployment, and semidefinite relaxation with successive convex approximation is adopted for optimizing the phase shift matrix. Finally, the simulation results show that: 1) compared with traditional antenna systems and orthogonal multiple access, the FAS-RIS-NOMA networks achieve higher system throughput under high signal-to-noise ratio conditions; and 2) by increasing the number of RIS elements and enlarging the FAS size, the sum rate of FAS-RIS-NOMA networks can be significantly enhanced.