| dc.description.abstract | In this project, Physical Layer Security (PHY{Security) is increasingly being adopted to
guarantee secure wireless communications because it takes advantage of the imperfections
of wireless channels such as fading, noise and interference to secure communication
between the Base station and legitimate nodesthe.A secure transmission in wireless
sensor networks consisting of one multiple-antenna base station, multiple single antenna
legitimate nodes, one single-antenna eavesdropper and one multiple-antenna cooperative
jammer is investigated. In order to maximize the secrecy performance of the network,
the Selection Combining scheme is exploited over the legitimate nodes.
In the meantime, the transmit antenna selection is employed at the BS and cooperative
jamming is adopted at the jammer node, aiming at reducing scheduling complexity
at the BS and achieving satisfactory secrecy performance. Furthermore, depending
on whether the jammer node has the channel state information of both the main and
wiretap channels, it explores a zero-forcing beamforming (ZFB) scheme to confuse the
eavesdropper while avoiding interference to the legitimate nodes. Subsequently, a novel
hybrid secure transmission scheme is proposed, denoted as TAS-SC-ZFB, for WSNs.
The exact closed-form expressions for the secrecy outage probability and the e ective
secrecy throughput for this scheme are derived to characterize the secrecy performance.
Using these closed-form expressions, the optimal power allocation factor between the BS
and jammer is determined to minimize the secrecy outage probability, while the optimal
secrecy rate is decided to maximize the e ective secrecy throughput for this scheme.
Numerical results are provided to the validate the theoretical analysis and show the
impact of key system parameters on the secrecy performance. | en_US |
