Secure Beamforming in Downlink MIMO Nonorthogonal Multiple Access Networks

Impact Factor:3.201

DOI number:10.1109/LSP.2017.2762321

Journal:IEEE Signal Processing Letters

Abstract:In this letter, we consider a cellular downlink multiple-input-multiple-output nonorthogonal multiple access (NOMA) secure transmission network, which consists of a base station, a central user, and a cell-edge user. The base station and two users are all equipped with multiple antennas. The central user is an entrusted user and the cell-edge user is a potential eavesdropper. We focus on secure beamforming optimization problem, which maximizes achievable secrecy rate of the central user subject to transmit power constraint at the base station and transmission rate requirement at the cell-edge user. The optimization problem is nonconvex. We employ majorization-minimization method to iteratively optimize a sequence of valid surrogate functions for the nonconvex optimization problem. Furthermore, in each iteration, we derive the semi-closed form solution to optimize the valid surrogate functions. Simulation results demonstrate that our proposed NOMA scheme outperforms the zero-forcing-based NOMA scheme and conventional orthogonal multiple access scheme.

Co-author:Li Yiqing,李全忠,秦家银

First Author:jmiao

Indexed by:Journal paper

Correspondence Author:张旗

Discipline:Engineering

First-Level Discipline:Information and Communication Engineering

Document Type:J

Volume:24

Issue:12

Page Number:1852—1856

ISSN No.:1558-2361

Translation or Not:no

Date of Publication:2017-12-01

Included Journals:SCI

Links to published journals:https://ieeexplore.ieee.org/document/8066389