@inproceedings{8e6ac5a4334a4e319264a26219837c19,
title = "Achieving covert communication by IRS-NOMA",
abstract = "We consider a covert communication scenario, where a legitimate transmitter (Alice) applies non-orthogonal multiple access (NOMA) to communicate with a covert user (Bob) and a public user (Roy) aided by an intelligent reflecting surface (IRS). Specifically, we propose to exploit the phase-shift uncertainty of the IRS and the non-orthogonal signal transmission of Roy as the cover medium to hide the existence of Bob's covert transmission from a warden (Willie). We derive an analytical expression for the minimum average detection error probability of Willie and optimize the transmit power and the IRS reflect beamforming for the covert rate maximization. Our analytical and numerical results show that covert communication is impossible without using IRS or NOMA for the considered setup, while the proposed scheme can always guarantee a positive covert rate.",
author = "Lu Lv and Qingqing Wu and Zan Li and Zhiguo Ding and Naofal Al-Dhahir and Jian Chen",
note = "Funding Information: ACKNOWLEDGEMENT This work was supported by the National Natural Science Foundation of China under Grant 61901313 and the open research fund of National Mobile Communications Research Laboratory, Southeast University, under Grant 2020D07. Publisher Copyright: {\textcopyright} 2021 IEEE.; 2021 IEEE/CIC International Conference on Communications in China, ICCC 2021 ; Conference date: 28-07-2021 Through 30-07-2021",
year = "2021",
month = jul,
day = "28",
doi = "10.1109/ICCC52777.2021.9580320",
language = "British English",
series = "2021 IEEE/CIC International Conference on Communications in China, ICCC 2021",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "421--426",
booktitle = "2021 IEEE/CIC International Conference on Communications in China, ICCC 2021",
address = "United States",
}