Event Details
Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer
Presenter: Maymoona Hayajneh
Supervisor:
Date: Thu, March 3, 2022
Time: 11:00:00 - 00:00:00
Place: ZOOM - Please see below.
ABSTRACT
ABSTRACT
The security of two-way relay communications in the presence of an eavesdropper
is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify
and forward the received signals. Time switching is employed at the relay to harvest energy and obtain user
information. A friendly jammer is utilized to hinder the eavesdropping from wiretapping the information
signal. The eavesdropper employs maximal ratio combining and selection combining to improve the signal
to noise ratio of the wiretapped signals. Geometric programming (GP) is used to maximize the secrecy
capacity of the system by jointly optimizing the time switching ratio of the relay and transmit power of
the two users and jammer. The impact of imperfect channel state information at the eavesdropper for the
links between the eavesdropper and the other nodes is determined. Further, the secrecy capacity when the
jamming signal is not perfectly canceled at the relay is examined. The secrecy capacity is shown to be greater
with a jammer compared to the case without a jammer. The effect of the relay, jammer, and eavesdropper
locations on the secrecy capacity is also studied. It is shown that the secrecy capacity is greatest when the
relay is at the midpoint between the users. The closer the jammer is to the eavesdropper, the higher the
secrecy capacity.
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