1 research outputs found
On Secrecy Metrics for Physical Layer Security over Quasi-Static Fading Channels
Theoretical studies on physical layer security often adopt the secrecy outage
probability as the performance metric for wireless communications over
quasi-static fading channels. The secrecy outage probability has two
limitations from a practical point of view: a) it does not give any insight
into the eavesdropper's decodability of confidential messages; b) it cannot
characterize the amount of information leakage to the eavesdropper when an
outage occurs. Motivated by the limitations of the secrecy outage probability,
we propose three new secrecy metrics for secure transmissions over quasi-static
fading channels. The first metric establishes a link between the concept of
secrecy outage and the decodability of messages at the eavesdropper. The second
metric provides an error-probability-based secrecy metric which is typically
used for the practical implementation of secure wireless systems. The third
metric characterizes how much or how fast the confidential information is
leaked to the eavesdropper. We show that the proposed secrecy metrics
collectively give a more comprehensive understanding of physical layer security
over fading channels and enable one to appropriately design secure
communication systems with different views on how secrecy is measured.ARC Discovery Projects Grant DP15010390