STAR-RIS Assisted Covert Communications in NOMA Systems

Autor:	Xiao, Han, Hu, Xiaoyan, Zheng, Tong-Xing, Wong, Kai-Kit
Rok vydání:	2023
Předmět:	Computer Science - Information Theory Electrical Engineering and Systems Science - Signal Processing
Druh dokumentu:	Working Paper
Popis:	Covert communications assisted by simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) in non-orthogonal multiple access (NOMA) systems have been explored in this paper. In particular, the access point (AP) transmitter adopts NOMA to serve a downlink covert user and a public user. The minimum detection error probability (DEP) at the warden is derived considering the uncertainty of its background noise, which is used as a covertness constraint. We aim at maximizing the covert rate of the system by jointly optimizing APs transmit power and passive beamforming of STAR-RIS, under the covertness and quality of service (QoS) constraints. An iterative algorithm is proposed to effectively solve the non-convex optimization problem. Simulation results show that the proposed scheme significantly outperforms the conventional RIS-based scheme in ensuring system covert performance. Comment: arXiv admin note: text overlap with arXiv:2305.04930, arXiv:2305.03991
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2306.07105 Zobrazit plný text záznamu View this record from Arxiv