TY - JOUR
T1 - Privacy preservation via beamforming for NOMA
AU - Cao, Yang
AU - Zhao, Nan
AU - Chen, Yunfei
AU - Jin, Minglu
AU - Fan, Lisheng
AU - Ding, Zhiguo
AU - Yu, F. Richard
N1 - Funding Information:
Manuscript received April 16, 2018; revised August 28, 2018, December 22, 2018, and March 23, 2019; accepted May 7, 2019. Date of publication May 20, 2019; date of current version July 10, 2019. The work of N. Zhao was supported by the National Natural Science Foundation of China (NSFC) under Grant 61871065 and Grant 61871139, in part by the Open Research Fund of the State Key Laboratory of Integrated Services Networks under Grant ISN19-02, and in part by the Xinghai Scholars Program. The work of Z. Ding was supported by the U.K. EPSRC under Grant EP/L025272/2, in part by NSFC under Grant 61728101, and in part by H2020-MSCA-RISE-2015 under Grant 690750. This paper was presented at the Proceedings of WCSP 2018 [1]. The associate editor coordinating the review of this paper and approving it for publication was J. Yuan. (Corresponding author: Nan Zhao.) Y. Cao, N. Zhao, and M. Jin are with the School of Information and Communication Engineering, Dalian University of Technology, Dalian 116024, China, and also with the State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 2019 IEEE.
PY - 2019/7
Y1 - 2019/7
N2 - Non-orthogonal multiple access (NOMA) has been proposed as a promising multiple access approach for 5G mobile systems because of its superior spectrum efficiency. However, the privacy between the NOMA users may be compromised due to the transmission of a superposition of all users' signals to successive interference cancellation (SIC) receivers. In this paper, we propose two schemes based on beamforming optimization for NOMA that can enhance the security of a specific private user while guaranteeing the other users' quality of service (QoS). Specifically, in the first scheme, when the transmit antennas are inadequate, we intend to maximize the secrecy rate of the private user, under the constraint that the other users' QoS is satisfied. In the second scheme, the private user's signal is zero-forced at the other users when redundant antennas are available. In this case, the transmission rate of the private user is also maximized while satisfying the QoS of the other users. Due to the non-convexity of optimization in these two schemes, we first convert them into convex forms, and then, an iterative algorithm based on the Concave-Convex Procedure is proposed to obtain their solutions. The extensive simulation results are presented to evaluate the effectiveness of the proposed schemes.
AB - Non-orthogonal multiple access (NOMA) has been proposed as a promising multiple access approach for 5G mobile systems because of its superior spectrum efficiency. However, the privacy between the NOMA users may be compromised due to the transmission of a superposition of all users' signals to successive interference cancellation (SIC) receivers. In this paper, we propose two schemes based on beamforming optimization for NOMA that can enhance the security of a specific private user while guaranteeing the other users' quality of service (QoS). Specifically, in the first scheme, when the transmit antennas are inadequate, we intend to maximize the secrecy rate of the private user, under the constraint that the other users' QoS is satisfied. In the second scheme, the private user's signal is zero-forced at the other users when redundant antennas are available. In this case, the transmission rate of the private user is also maximized while satisfying the QoS of the other users. Due to the non-convexity of optimization in these two schemes, we first convert them into convex forms, and then, an iterative algorithm based on the Concave-Convex Procedure is proposed to obtain their solutions. The extensive simulation results are presented to evaluate the effectiveness of the proposed schemes.
KW - beamforming optimization
KW - non-convex programming
KW - Non-orthogonal multiple access
KW - physical layer security
KW - privacy protection
KW - zero-forcing
UR - http://www.scopus.com/inward/record.url?scp=85068904400&partnerID=8YFLogxK
U2 - 10.1109/TWC.2019.2916363
DO - 10.1109/TWC.2019.2916363
M3 - Article
AN - SCOPUS:85068904400
SN - 1536-1276
VL - 18
SP - 3599
EP - 3612
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 7
M1 - 8718520
ER -