  In this paper, we study using Destination Artificial Noise (DAN) besides
Source Artificial Noise (SAN) to enhance physical layer secrecy with an outage
probability based approach. It is assumed that all nodes in the network (i.e.
source, destination and eavesdropper) are equipped with multiple antennas. In
addition, the eavesdropper is passive and its channel state and location are
unknown at the source and destination. In our proposed scheme, by optimized
allocation of power to the SAN, DAN and data signal, a minimum value for the
outage probability is guaranteed at the eavesdropper, and at the same time a
certain level of signal to noise ratio (SNR) at the destination is ensured. Our
simulation results show that using DAN along with SAN brings a significant
enhancement in power consumption compared to methods that merely adopt SAN to
achieve the same outage probability at the eavesdropper.
