Multi-Beam Symbol-Level Secure Communication for Hybrid Near- and Far-Field Communications

TL;DR

This paper proposes a multi-beam symbol-level directional modulation scheme for hybrid near- and far-field 6G communications, enhancing security by reducing eavesdropper signal quality while maintaining legitimate user reception.

Contribution

It introduces a novel multi-beam symbol-level directional modulation method tailored for mixed near- and far-field scenarios, addressing security challenges in 6G networks.

Findings

Improves secrecy performance in hybrid communication environments.

Reduces transmission power and enhances energy efficiency.

Demonstrates effectiveness through simulations and experiments.

Abstract

This paper introduces a multi-beam secure communication scheme for mixed near-field and far-field (hNF) scenarios, primarily designed to address the challenges faced by sixth-generation (6G) networks in simultaneously managing near-field and far-field communications. This method significantly reduces the signal quality at eavesdroppers(Eves) while ensuring high-quality reception for legitimate users, effectively enhancing communication security. At the transmitter, this study employs multi-beam symbol-level directional modulation to ensure secure and reliable transmission in a mixed eavesdropping environment. Given the uncertainty about eavesdropper information, the transmission beamforming vectors are specially designed to meet specific symbol-level constraints, thereby ensuring effective reception for legitimate users. Experimental and simulation results demonstrate the effectiveness of our approach in improving secrecy performance, reducing transmission power, and enhancing energy efficiency, offering a practical solution to the security challenges faced by future wireless networks.