On the Secrecy Outage Capacity of Physical Layer Security in Large-Scale MIMO Relaying Systems with Imperfect CSI

TL;DR

This paper investigates the secrecy outage capacity of large-scale MIMO relaying systems under imperfect CSI, providing explicit formulas and analyzing the impact of channel uncertainties on security performance.

Contribution

It offers a comprehensive analysis of physical layer security in LS-MIMO relaying systems with imperfect CSI, deriving explicit secrecy outage capacity expressions for AF and DF protocols.

Findings

Imperfect CSI significantly affects secrecy outage capacity.

Explicit formulas for secrecy capacity under practical assumptions.

Numerical validation confirms theoretical results.

Abstract

In this paper, we study the problem of physical layer security in a large-scale multiple-input multiple-output (LS-MIMO) relaying system. The advantage of LS-MIMO relaying systems is exploited to enhance both wireless security and spectral efficiency. In particular, the challenging issue incurred by short interception distance is well addressed. Under very practical assumptions, i.e., no eavesdropper's channel state information (CSI) and imperfect legitimate channel CSI, this paper gives a thorough investigation of the impact of imperfect CSI in two classic relaying systems, i.e., amplify-and-forward (AF) and decode-and-forward (DF) systems, and obtain explicit expressions of secrecy outage capacities for both cases. Finally, our theoretical claims are validated by the numerical results.