Movable antenna (MA) has been recently proposed as a promising candidate technology for the next generation wireless communication systems due to its significant capability of reconfiguring wireless channels via antenna movement. In this letter, we study an MA-enabled uplink non-orthogonal multiple access (NOMA) system, where each user is equipped with a single MA. Our objective is to maximize the users' sum rate by jointly optimizing the MAs' positions, the decoding order and the power control. To solve this non-convex problem, we equivalently transform it into two tractable subproblems. First, we use the successive convex approximation (SCA) to find a locally optimal solution for the antenna position optimization subproblem. Next, we derive the closed-form optimal solution of the decoding order and power control subproblem. Numerical results show that our proposed MA-enabled NOMA system can significantly enhance the sum rate compared to fixed-position antenna (FPA) systems and orthogonal multiple access (OMA) systems.
@article{arxiv.2408.06789,
title = {Sum Rate Maximization for Movable Antenna Enabled Uplink NOMA},
author = {Nianzu Li and Peiran Wu and Boyu Ning and Lipeng Zhu},
journal= {arXiv preprint arXiv:2408.06789},
year = {2025}
}
Comments
5 pages, 3 figures. Accepted to IEEE Wireless Communications Letters