Secure Transmission in MIMO-NOMA Networks

TL;DR

This paper proposes a linear precoding method for MIMO-NOMA networks that enhances physical layer security by increasing secrecy rates while maintaining computational efficiency.

Contribution

It introduces a novel power splitting and channel decomposition technique for secure MIMO-NOMA transmission, improving secrecy performance over existing methods.

Findings

Significantly enlarges the secrecy rate compared to existing linear precoding methods.

Effectively balances performance and computational complexity.

Simulation results confirm the method's effectiveness.

Abstract

This letter focuses on the physical layer security over two-user multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) networks. A linear precoding technique is designed to ensure the confidentiality of the message of each user from its counterpart. This technique first splits the base station power between the two users and, based on that, decomposes the secure MIMO-NOMA channel into two MIMO wiretap channels, and designs the transmit covariance matrix for each channel separately. The proposed method substantially enlarges the secrecy rate compared to existing linear precoding methods and strikes a balance between performance and computation cost. Simulation results verify the effectiveness of the proposed method.