TY - JOUR
T1 - Secure Transmission via Power Allocation in NOMA-UAV Networks with Circular Trajectory
AU - Chen, Xinying
AU - Yang, Zhutian
AU - Zhao, Nan
AU - Chen, Yunfei
AU - Wang, Jingjing
AU - Ding, Zhiguo
AU - Yu, F. Richard
N1 - Funding Information:
Manuscript received February 23, 2020; revised May 18, 2020; accepted June 22, 2020. Date of publication June 25, 2020; date of current version October 13, 2020. This work was supported by the National Natural Science Foundation of China (NSFC) under Grants 61871065 and U1806201. This article was presented in part at the Proceedings of IEEE PIMRC’20, London, U.K., September 2020 [1]. The review of this article was coordinated by Dr. F. Tang. (Corresponding authors: Nan Zhao; Jingjing Wang.) Xinying Chen and Nan Zhao are with the Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education, Dalian University of Technology, Dalian 116024, China, and also with the Pengcheng Laboratory, Shenzhen 518066, China (e-mail: [email protected]; [email protected]).
Publisher Copyright:
© 1967-2012 IEEE.
PY - 2020/9
Y1 - 2020/9
N2 - Non-orthogonal multiple access (NOMA) aided unmanned aerial vehicle (UAV) is becoming a promising technique for future wireless networks. However, its security remains a great challenge due to the line-of-sight in UAV communications and high transmit power for weak users in NOMA. Thus, in this paper, we propose a power allocation (PA) scheme for NOMA-UAV networks with circular trajectory, to maximize the sum rate of common users while guaranteeing the security for a specific user. To achieve this, we consider three cases based on the distance from the UAV to the secure user. Specifically, the lowest transmit power is assigned to the secure user in each time slot to guarantee its security, with the remaining power allocated to common users to maximize their sum rate. Due to the non-convexity of the problem, we analyze its monotonicity and derive the closed-form solutions for these three cases. To further improve the transmission rate of the secure user, we also derive the upper bound for its decoding threshold, and analyze the linear relationship between the secure decoding threshold and the sum rate of common users. Simulation results are demonstrated to evaluate the effectiveness of the proposed secure PA scheme in NOMA-UAV networks.
AB - Non-orthogonal multiple access (NOMA) aided unmanned aerial vehicle (UAV) is becoming a promising technique for future wireless networks. However, its security remains a great challenge due to the line-of-sight in UAV communications and high transmit power for weak users in NOMA. Thus, in this paper, we propose a power allocation (PA) scheme for NOMA-UAV networks with circular trajectory, to maximize the sum rate of common users while guaranteeing the security for a specific user. To achieve this, we consider three cases based on the distance from the UAV to the secure user. Specifically, the lowest transmit power is assigned to the secure user in each time slot to guarantee its security, with the remaining power allocated to common users to maximize their sum rate. Due to the non-convexity of the problem, we analyze its monotonicity and derive the closed-form solutions for these three cases. To further improve the transmission rate of the secure user, we also derive the upper bound for its decoding threshold, and analyze the linear relationship between the secure decoding threshold and the sum rate of common users. Simulation results are demonstrated to evaluate the effectiveness of the proposed secure PA scheme in NOMA-UAV networks.
KW - Circular trajectory
KW - non-orthogonal multiple access
KW - physical layer security
KW - power allocation
KW - unmanned aerial vehicle
UR - http://www.scopus.com/inward/record.url?scp=85094113027&partnerID=8YFLogxK
U2 - 10.1109/TVT.2020.3005120
DO - 10.1109/TVT.2020.3005120
M3 - Article
AN - SCOPUS:85094113027
SN - 0018-9545
VL - 69
SP - 10033
EP - 10045
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 9
M1 - 9126239
ER -