Energy efficient secure MIMO transmission in the presence of smart attacker

The multi-input multi-output (MIMO) transmission against a smart attacker has recently been formulated as a non-collaborative game, in which the reinforcement learning-based transmitter is devised to suppress the attack motivation of the malicious attacker for more secure transmission. Basically, large enough transmission power is needed to obtain the Nash equilibrium in favour of the MIMO transmitter. When energy efficiency is required, a secure MIMO transmission design with reasonable energy efficiency will become highly desirable. This study focuses on how to make the MIMO transmitter not only resist malicious attacker but also realise reasonable energy efficiency. To this end, a new game between the MIMO transmitter and the malicious attacker is formulated to take into account the energy efficiency of the MIMO transmitter. Since the energy efficiency requirement tends to reduce the transmission power by the MIMO transmitter, which may degrade the realised security performance in an adverse environment, the probabilistic transmission strategy was employed to further enhance the secure transmission. The analysis results unveil that the proposed energy-efficient secure MIMO transmission design can not only ensure reasonable security performance but also noticeably improve energy efficiency performance.