Affiliations: [a] School of Computer Science and Technology, North China University of Technology, Beijing, China | [b] Beijing Institute of Control Engineering, Beijing, China
Correspondence:
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Corresponding author: Jianyu Zhao, School of Computer Science and Technology, North China University of Technology, Beijing, China. E-mail: zhaojianyu1995@126.com.
Abstract: Physical layer security will play a critical role in the next generation of fifth-generation (5G) communication system, and assume that global channel state information can be obtained, a hybrid unicast/multicast transmission system for eavesdroppers in a Three-Dimensional Multi-Input Multi-Output (3D MIMO) channel scenario anti-eavesdropping program can be proposed. This system is analyzed and simulated under the cylindrical antenna array scenario with mutual coupling channel. Users (UEs) are divided into three groups, multicast group, unicast group and eavesdropping group. In order to eliminate the interference within each group, this system adopts multicast transmission beamforming in multicast group and linear transmission precoding in unicast group, then the interference among groups can be eliminated by zero-space method, and the confidential signal cannot be received by eavesdroppers with the anti-eavesdropping scheme. The simulation results indicate that under the anti-eavesdropping scheme of transmitting signals from transmitters, beamforming/precoding and interference cancellation, the secrecy rate has obvious improved.
