Secret DMT Analysis for a Multiuser MIMO Fading Channel

In wireless communications, eavesdropping is a threat due to the broadcast nature of the channel. Therefore, in addition to the rate and the error probability, the secrecy level should be considered in design and analysis of a system. In this study, by the error probability and the channel outage analysis, we derive the secret diversity-multiplexing tradeoff (DMT) for a multiuser multiple-input multiple-output (MIMO) fading channel. We consider two multiuser schemes, multiple-access channel and user-selection. Secret DMT characterizes the relation of the error probability, the secrecy and the rate of the system at high signal-to-noise ratio (SNR). We quantify how the number of users and antennas at all the nodes affects the secret DMT performance of the system.