Buffer-Aided Relay Selection Algorithms for Physical-Layer Security in Wireless Networks

TL;DR

This paper introduces buffer-aided relay selection algorithms utilizing multiple antennas and linear precoding to enhance physical-layer security in wireless networks, demonstrating improved secrecy rates through novel relay selection strategies.

Contribution

It proposes a new finite buffer-aided relay selection algorithm based on the ML criterion, exploiting relay buffers to significantly improve secrecy performance.

Findings

Enhanced secrecy-rate performance with the proposed algorithms

Buffer-aided relay selection outperforms traditional methods

Numerical results confirm the effectiveness of the approach

Abstract

In this work, we consider the use of buffer-aided relays, linear precoding techniques and multiple antennas for physical-layer security in wireless networks. We develop relay selection algorithms to improve the secrecy-rate performance of cooperative multi-user multiple-antenna wireless networks. In particular, we propose a novel finite buffer-aided relay selection algorithm that employs the maximum likelihood (ML) criterion to select sets of relays which fully exploit the flexibility offered by relay nodes equipped with buffers. Numerical results show the benefits of the proposed techniques as compared to prior art.