Open AccessPhysical layer security of multiple‐input–multiple‐output systems with transmit beamforming in Rayleigh fading
Author(s) -
Ammari Mohamed Lassaad,
Fortier Paul
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0534
Subject(s) - rayleigh fading , secrecy , channel state information , computer science , transmitter , beamforming , physical layer , maximal ratio combining , channel (broadcasting) , fading , signal to noise ratio (imaging) , telecommunications , wireless , computer security
This study analyses the physical layer security in the wiretap channel for multiple‐input–multiple‐output transmit‐beamforming (TB) systems with maximal ratio combining (MRC) receivers. The TB is designed to maximise the signal‐to‐noise ratio (SNR) at the main receiver output. The authors assume that both legitimate and eavesdropper receivers have the knowledge of their own channel state information (CSI). Furthermore, they consider that the transmitter has the full CSI of the main channel and does not have the CSI of the eavesdropper's channel. At the eavesdropper, two combining methods are considered: (i) MRC technique and (ii) selection combining method. They derive closed‐form expressions for the exact secrecy outage probability (SOP) and the probability of strictly positive secrecy capacity. Expressions of the asymptotic SOP and the asymptotic ε ‐outage secrecy capacity are also derived. The secrecy diversity order and the secrecy SNR gain are then obtained.