1 research outputs found
An Artificial-Noise-Aided Secure Scheme for Hybrid Parallel PLC/Wireless OFDM Systems
We investigate the physical-layer security of indoor hybrid parallel
power-line/wireless orthogonal-frequency division-multiplexing (OFDM)
communication systems. We propose an artificial-noise (AN) aided scheme to
enhance the system's security in the presence of an eavesdropper by exploiting
the decoupled nature of the power-line and wireless communication media. The
proposed scheme does not require the instantaneous channel state information of
the eavesdropper's links to be known at the legitimate nodes. In our proposed
scheme, the legitimate transmitter (Alice) and the legitimate receiver (Bob)
cooperate to secure the hybrid system where an AN signal is shared from Bob to
Alice on the link with the lower channel-to-noise ratio (CNR) while the
information stream in addition to a noisy-amplified version of the received AN
signal is transmitted from Alice to Bob on the link with higher CNR at each
OFDM sub-channel. In addition, we investigate the effect of the transmit power
levels at both Alice and Bob and the power allocation ratio between the data
and AN signals at Alice on the secure throughput. We investigate both
single-link eavesdropping attacks, where only one link is exposed to
eavesdropping attacks, and two-link eavesdropping attacks, where the two links
are exposed to eavesdropping attacks