Optimal Strategies for Countering Dual-Threat Jamming/Eavesdropping-Capable Adversaries in MIMO Channels
This paper investigates transmission strategies in a MIMO wiretap channel with a transmitter, receiver and wire-tapper, each equipped with multiple antennas. In a departure from existing work, the wire-tapper is able to act either as a passive eavesdropper or as an active jammer per channel use, under a half-duplex constraint. The transmitter therefore faces a choice between dynamically allocating all of its power for data; or broadcasting artificial noise along with the information signal in order to selectively degrade the eavesdropper's channel. The authors model the network as a zero-sum game in strategic form with the MIMO secrecy rate as the payoff function. They first carry out a detailed analysis of the various rate outcomes that result from the possible actions of the agents.