2 research outputs found
Artificial Noisy MIMO Systems under Correlated Scattering Rayleigh Fading -- A Physical Layer Security Approach
The existing investigations on artificial noise (AN) security systems assumed
that only null spaces is used to send AN signals, and all eigen-subchannels
should be used to transmit messages. Our previous work proposed an AN scheme
that allocates some of eigen-subchannels to transmit AN signals for improving
secrecy rates. Nevertheless, our previous work considered only uncorrelated
MIMO Rayleigh fading channels. In fact, the correlations among antennas exist
in realistic scattering channel environments. In this paper, we extend our
previous AN scheme to spatially correlated Rayleigh fading channels at both
legitimate receiver- and eavesdropper-sides and derive an exact theoretical
expression for the ergodic secrecy rate of the AN scheme, along with an
approximate analysis. Both numerical and simulation results show that the
proposed AN scheme offers a higher ergodic secrecy rate than the existing
schemes, revealing a fact that the correlation among eavesdropper's antennas
can potentially improve the secrecy rate of an MIMO system
Physical Layer Security Enhancement Using Artificial Noise in Cellular Vehicle-to-Everything (C-V2X) Networks
The secure transmission of confidential information in cellular
vehicle-to-everything (C-V2X) communication networks is vitally important for
user's personal safety. However, for C-V2X there have not been much studies on
the physical layer security (PLS). Since artificial noise (AN) and secure
beamforming are popular PLS techniques for cellular communications, in this
paper we investigate the potential of these PLS techniques for enhancing the
security of C-V2X networks. In particular, leveraging stochastic geometry, we
study the PLS of an AN assisted C-V2X network, where the locations of
legitimate vehicular nodes, malicious vehicular nodes and road side units
(RSUs) are modeled by Cox processes driven by a common Poisson line process
(PLP), and the locations of cellular base stations (BSs) are modeled by a
two-dimensional (2D) Poisson point process (PPP). Based on the maximum
signal-to-interference-ratio (SIR) association scheme, we calculate the
coverage probability of the network. We also derive bounds on the secrecy
probability, which are validated by simulation results. Moreover, we obtain an
analytical result of the effective secrecy throughput for characterizing the
reliability and security of wiretap channels. Simulation results are given to
validate the analytical result, and provide interesting insights into the
impact of network parameters on the achievable secrecy performance. Simulation
results show that a larger array antenna can provide a better robustness of the
secure transmission strategy, and the optimal power allocation ratio between
confidential information and AN remains almost unchanged for different numbers
of antennas