A simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs) enhanced uplink non-orthogonal multiple access (NOMA) communication system is proposed. A total power consumption minimization problem is formulated by jointly optimizing the transmit-power of users, receive-beamforming vectors at the base station (BS), STAR-beamforming vectors at the STAR-RIS and time slots. Here, the STAR-beamforming introduced by STAR-RIS consists of transmission- and reflection-beamforming. To solve the formulated non-convex problem, an efficient penalty-based alternating optimization (P-AltOp) algorithm is proposed. Simulation results validate the effectiveness of the proposed scheme and reveal the effect of various system parameters on the total power consumption.
@article{arxiv.2110.05686,
title = {Uplink NOMA For STAR-RIS Networks},
author = {Jiakuo Zuo and Yuanwei Liu and Zhiguo Ding and Xianbin Wang},
journal= {arXiv preprint arXiv:2110.05686},
year = {2021}
}