Collaborative Relay Beamforming for Secure Broadcasting

TL;DR

This paper explores collaborative relay beamforming with perfect CSI to enhance physical-layer security, proposing decode-and-forward null space schemes and optimizing relay weights to maximize secrecy rates.

Contribution

It introduces novel decode-and-forward null space beamforming schemes and jointly optimizes relay weights for secure broadcasting with theoretical analysis.

Findings

Proposed schemes achieve near-optimal secrecy rate regions.

Joint relay weight optimization significantly improves security performance.

Comparison with outer bounds validates the schemes' effectiveness.

Abstract

In this paper, collaborative use of relays to form a beamforming system with the aid of perfect channel state information (CSI) and to provide communication in physicallayer security between a transmitter and two receivers is investigated. In particular, we describe decode-and-forward based null space beamforming schemes and optimize the relay weights jointly to obtain the largest secrecy rate region. Furthermore, the optimality of the proposed schemes is investigated by comparing them with the outer bound secrecy rate region