Artificial Noise Revisited

Abstract

The artificial noise (AN) scheme, proposed by Goel and Negi, is being considered as one of the key enabling technology for secure communications over multiple-input multiple-output (MIMO) wiretap channels. However, the decrease in secrecy rate due to the increase in the number of Eve's antennas is not well understood. In this paper, we develop an analytical framework to characterize the secrecy rate of the AN scheme as a function of Eve's signal-to-noise ratio (SNR), Bob's SNR, the number of antennas in each terminal, and the power allocation scheme. We first derive a closed-form expression for the average secrecy rate. We then derive a closed-form expression for the asymptotic instantaneous secrecy rate with large number of antennas at all terminals. Finally, we derive simple lower and upper bounds on the average and instantaneous secrecy rate that provide a tool for the system design.

4 figures, submitted to IEEE Trans on Wireless Commun

References in corpus (1)

• Enhancing Secrecy with Multi-Antenna Transmission in Wireless Ad Hoc Networks

Cited by in corpus (4)

• Joint Trajectory and Power Allocation Design for Secure Artificial Noise aided UAV Communications
• Secrecy Analyses of a Full-Duplex MIMOME Network
• Artificial Noisy MIMO Systems under Correlated Scattering Rayleigh Fading -- A Physical Layer Security Approach
• Guaranteeing Positive Secrecy Capacity with Finite-Rate Feedback using Artificial Noise