Privacy preservation via beamforming for NOMA

Yang Cao, Nan Zhao, Yunfei Chen, Minglu Jin, Lisheng Fan, Zhiguo Ding, F. Richard Yu

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

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.

Original languageBritish English
Article number8718520
Pages (from-to)3599-3612
Number of pages14
JournalIEEE Transactions on Wireless Communications
Volume18
Issue number7
DOIs
StatePublished - Jul 2019

Keywords

  • beamforming optimization
  • non-convex programming
  • Non-orthogonal multiple access
  • physical layer security
  • privacy protection
  • zero-forcing

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