Improving Physical Layer Secrecy Using Full-Duplex Jamming Receivers

Abstract

Abstract-This paper studies secrecy rate optimization in a wireless network with a single-antenna source, a multi-antenna destination and a multi-antenna eavesdropper. This is an unfavorable scenario for secrecy performance as the system is interference-limited. In the literature, assuming that the receiver operates in half duplex (HD) mode, the aforementioned problem has been addressed via use of cooperating nodes who act as jammers to confound the eavesdropper. This paper investigates an alternative solution, which assumes the availability of a full duplex (FD) receiver. In particular, while receiving data, the receiver transmits jamming noise to degrade the eavesdropper channel. The proposed self-protection scheme eliminates the need for external helpers and provides system robustness. For the case in which global channel state information is available, we aim to design the optimal jamming covariance matrix that maximizes the secrecy rate and mitigates loop interference associated with the FD operation. We consider both fixed and optimal linear receiver design at the destination, and show that the optimal jamming covariance matrix is rank-1, and can be found via an efficient 1-D search. For the case in which only statistical information on the eavesdropper channel is available, the optimal power allocation is studied in terms of ergodic and outage secrecy rates. Simulation results verify the analysis and demonstrate substantial performance gain over conventional HD operation at the destination.

PELE: Power efficient legitimate eavesdropping via jamming in UAV communications

“…Jamming the eavesdropper is an emerging approach to enhance the quality of secure wireless transmissions [12][13][14][15]. In [12], a cooperative jamming scheme is studied to help a legitimate user improve its data rate via sending jamming signal to eavesdropper.…”

“…They study the power allocations for the transmitting and jamming users, and show that significant rate gains may be achieved when the eavesdropper has much higher SNR than the receivers. In [13], a self-protection scheme is developed to transmit the jamming signal to degrade the channel of eavesdropper. Using the proposed full-duplex scheme, the system is shown to be no longer interferencelimited, in contrast to the half-duplex case.…”

“…This scheme addresses the problem of protecting the data transmissions in halfduplex communications. However, eavesdropping is taken as an illegitimate attack in [12][13][14][15]. As a result, they target on decreasing the eavesdropping performance.…”

Power allocation for energy-constrained cognitive radios in the presence of an eavesdropper

“…This way, the cognitive radio may lose some transmission opportunities, but the lifetime of the cognitive radio increases, and data transmission security is also assured. Further, in case we are dealing with a real-time system, the quality of the cognitive channel can be improved with respect to the eavesdropper channel by adding artificial noise to the eavesdropper through the cooperation of friendly jammers [13,14,15].…”

Secure Spatial Modulation With a Full-Duplex Receiver

“…By contrast, the recently emerged full-duplex (FD) techniques [10] implementation [11,12]. Hence, a FD receiver with jamming capability may be deployed to improve the secrecy performance, without imposing extra burden on the transmitter.…”