Successive Optimization Tomlinson-Harashima Precoding Strategies for Physical-Layer Security in Wireless Networks

TL;DR

This paper introduces a novel successive optimization non-linear precoding method for enhancing physical-layer security in wireless MIMO networks, demonstrating superior performance over existing techniques in simulations.

Contribution

The paper proposes a new SO-THP+S-GMI precoding strategy combined with artificial noise injection for improved security and performance in multi-user MIMO systems.

Findings

Outperforms existing precoding algorithms in BER and secrecy rate

Effective in various channel state information conditions

Enhances physical-layer security in wireless networks

Abstract

In this paper, we propose successive optimization non-linear precoding strategies for physical-layer security in wireless networks. We also investigate different precoding techniques for multi-user MIMO systems under various conditions of channel state information (CSI) between the access point and the users and the eavesdroppers. A non-linear precoding technique based on Successive Optimization Tomlinson-Harashima Precoding (SO-THP) and Simplified Generalized Matrix Inversion (S-GMI) technique is proposed along with a strategy for injecting artificial noise prior to transmission. Simulation results show that the proposed SO-THP+S-GMI precoding technique outperforms existing non-linear and linear precoding algorithms in terms of BER and secrecy rate performances.