Movable Antenna Enhanced Secure Uplink NOMA Networks

In this work, we investigate a movable antenna (MA) enhanced secure uplink non-orthogonal multiple access (NOMA) network, where multiple legitimate users, each equipped with an MA, transmit confidential information to the base station in the presence of an eavesdropper. Our goal is to maximize the system's secrecy sum rate by jointly optimizing the positions of MAs, the transmit power of each user, and the receive combining vectors at the base station. To tackle the formulated non-convex problem, we first transform it into a more tractable form and then develop a customized heuristics algorithm by invoking particle swarm optimization (PSO) to obtain a high-quality suboptimal solution. Simulation results validate the efficacy of our proposed algorithm, demonstrating its superior performance over conventional fixed-position antenna (FPA) systems and other baselines.