4 research outputs found
Location-Based Beamforming for Rician Wiretap Channels
We propose a location-based beamforming scheme for wiretap channels, where a
source communicates with a legitimate receiver in the presence of an
eavesdropper. We assume that the source and the eavesdropper are equipped with
multiple antennas, while the legitimate receiver is equipped with a single
antenna. We also assume that all channels are in a Rician fading environment,
the channel state information from the legitimate receiver is perfectly known
at the source, and that the only information on the eavesdropper available at
the source is her location. We first describe how the beamforming vector that
minimizes the secrecy outage probability of the system is obtained,
illustrating its dependence on the eavesdropper's location. We then derive an
easy-to-compute expression for the secrecy outage probability when our proposed
location-based beamforming is adopted. Finally, we investigate the impact
location uncertainty has on the secrecy outage probability, showing how our
proposed solution can still allow for secrecy even when the source has limited
information on the eavesdropper's location.Comment: 6 pages, 4 figure
Defining Spatial Security Outage Probability for Exposure Region Based Beamforming
With increasing number of antennae in base stations, there is considerable
interest in using beamfomining to improve physical layer security, by creating
an `exposure region' that enhances the received signal quality for a legitimate
user and reduces the possibility of leaking information to a randomly located
passive eavesdropper. The paper formalises this concept by proposing a novel
definition for the security level of such a legitimate transmission, called the
`Spatial Secrecy Outage Probability' (SSOP). By performing a theoretical and
numerical analysis, it is shown how the antenna array parameters can affect the
SSOP and its analytic upper bound. Whilst this approach may be applied to any
array type and any fading channel model, it is shown here how the security
performance of a uniform linear array varies in a Rician fading channel by
examining the analytic SSOP upper bound.Comment: Submitted to the IEEE Transactions on Wireless Communication
Location-Based Beamforming and Physical Layer Security in Rician Wiretap Channels
We propose a new location-based beamforming (LBB) scheme for wiretap
channels, where a multi-antenna source communicates with a single-antenna
legitimate receiver in the presence of a multi-antenna eavesdropper. We assume
that all channels are in a Rician fading environment, the channel state
information from the legitimate receiver is perfectly known at the source, and
that the only information on the eavesdropper available at the source is her
location. We first describe how the optimal beamforming vector that minimizes
the secrecy outage probability of the system is obtained, illustrating its
dependence on the eavesdropper's location. We then derive an easy-to-compute
expression for the secrecy outage probability when our proposed LBB scheme is
adopted. We also consider the positive impact a friendly jammer can have on our
beamforming solution, showing how the path to optimality remains the same.
Finally, we investigate the impact of location uncertainty on the secrecy
outage probability, showing how our solution can still allow for secrecy even
when the source only has a noisy estimate of the eavesdropper's location. Our
work demonstrates how a multi-antenna array, operating in the most general
channel conditions and most likely system set-up, can be configured rapidly in
the field so as to deliver an optimal physical layer security solution.Comment: 11 pages, 8 figures. Accepted for publication in IEEE Transactions on
Wireless Communications. arXiv admin note: substantial text overlap with
arXiv:1510.0856
Location-based beamforming for Rician wiretap channels
We propose a location-based beamforming scheme for wiretap channels, where a source communicates with a legitimate receiver in the presence of an eavesdropper. We assume that the source and the eavesdropper are equipped with multiple antennas, while the legitimate receiver is equipped with a single antenna. We also assume that all channels are in a Rician fading environment, the channel state information from the legitimate receiver is perfectly known at the source, and that the only information on the eavesdropper available at the source is her location. We first describe how the beamforming vector that minimizes the secrecy outage probability of the system is obtained, illustrating its dependence on the eavesdropper's location. We then derive an easy-to-compute expression for the secrecy outage probability when our proposed location-based beamforming is adopted. Finally, we investigate the impact location uncertainty has on the secrecy outage probability, showing how our proposed solution can still allow for secrecy even when the source has limited information on the eavesdropper's location