6 research outputs found
Artificial Noise: Transmission Optimization in Multi-Input Single-Output Wiretap Channels
We analyze and optimize the secrecy performance of
artificial noise (AN) in multi-input single-output wiretap channels
with multiple antennas at the transmitter and a single antenna at
the receiver and the eavesdropper. We consider two transmission
schemes: 1) an on-off transmission scheme with a constant secrecy
rate for all transmission periods, and 2) an adaptive transmission
scheme with a varying secrecy rate during each transmission
period. For the on-off transmission scheme, an easy-to-compute
expression is derived for the hybrid outage probability, which
allows us to evaluate the transmission outage probability and the
secrecy outage probability. For the adaptive transmission scheme
where transmission outage does not occur, we derive a closedform
expression for the secrecy outage probability. Using these
expressions, we determine the optimal power allocation between
the information signal and the AN signal and also determine the
optimal secrecy rate such that the effective secrecy throughput
is maximized for both transmission schemes. We show that the
maximum effective secrecy throughput requires more power to
be allocated to the AN signal when the quality of the transmitterreceiver
channel or the transmitter-eavesdropper channel improves.
We also show that both transmission schemes achieve
a higher maximum effective secrecy throughput while incurring
a lower secrecy outage probability than existing schemes.ARC Discovery Projects Grant DP150103905