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A Gaussian multiple-input multiple-output (MIMO) wiretap channel model isconsidered. The input is a two-antenna transmitter, while the outputs are thelegitimate receiver and an eavesdropper, both equipped with multiple antennas.All channels are assumed to be known. The problem of obtaining the optimalinput covariance matrix that achieves secrecy capacity subject to a powerconstraint is addressed, and a closed-form expression for the secrecy capacityis obtained.

Closed Form Secrecy Capacity of MIMO Wiretap Channels with Two Transmit Antennas