Low-Complexity Leakage-based Secure Precise Wireless Transmission with Hybrid Beamforming

TL;DR

This paper proposes a hybrid beamforming scheme for secure precise wireless transmission that reduces hardware complexity while maintaining high secrecy performance, using a novel SLNR and ANLNR based approach.

Contribution

It introduces a hybrid digital and analog beamforming scheme with random frequency mapping for secure wireless transmission, reducing hardware costs and complexity.

Findings

Achieves comparable secrecy performance to fully digital schemes.

Reduces RF-chain circuit budget significantly.

Maintains low computational complexity.

Abstract

In conventional secure precise wireless transmission (SPWT), fully digital beamforming (FDB) has a high secrecy performance in transmit antenna system, but results in a huge RF-chain circuit budget for medium-scale and large-scale systems. To reduce the complexity, this letter considers a hybrid digital and analog (HDA) structure with random frequency mapped into the RF-chains to achieve SPWT. Then, a hybrid SPWT scheme based on maximizing signal-to-leakage-and-noise ratio (SLNR) and artificial-noise-to-leakage-and-noise ratio (ANLNR) (M-SLNR-ANLNR) is proposed. Compared to the FDB scheme, the proposed scheme reduces the circuit budget with low computational complexity and comparable secrecy performance.