  We evaluate and quantify the joint effect of fading and multiple interferers
on the physical-layer (PHY) security of a system consisted of a base-station
(BS), a legitimate user, and an eavesdropper. To this end, we present a novel
closed-form expression for the secrecy outage probability, which takes into
account the fading characteristics of the wireless environment, the location
and the number of interferers, as well as the transmission power of the BS and
the interference. The results reveal that the impact of interference should be
seriously taken into account in the design and deployment of a wireless system
with PHY security.
