Robust Beamforming for Security in MIMO Wiretap Channels with Imperfect CSI

—In this paper, we investigate methods for reducing the likelihood that a message transmitted between two multiantenna nodes is intercepted by an undetected eavesdropper. In particular, we focus on the judicious transmission of artificial interference to mask the desired signal at the time it is broadcast. Unlike previous work that assumes some prior knowledge of the eavesdropper’s channel and focuses on maximizing secrecy capacity, we consider the case where no information regarding the eavesdropper is available, and we use signal-to-interferenceplus-noise-ratio (SINR) as our performance metric. Specifically, we focus on the problem of maximizing the amount of power available to broadcast a jamming signal intended to hide the desired signal from a potential eavesdropper, while maintaining a prespecified SINR at the desired receiver. The jamming signal is designed to be orthogonal to the information signal when it reaches the desired receiver, assuming both the receiver and the ...

• Type: Journal
• Year: 2010
• Where: CORR
• Authors: Amitav Mukherjee, A. Lee Swindlehurst
• Keywords: CORR 2010, Eavesdropper, Education, Perfect Csi, Robust Beamforming Schemes