Optimal Signaling for Secure Communications Over Gaussian MIMO Wiretap Channels
Optimal Signaling for Secure Communications Over Gaussian MIMO Wiretap Channels
Optimal signaling over the Gaussian multiple-input multiple-output wire-tap channel is studied under the total transmit power constraint. A closed-form solution for an optimal transmit covariance matrix is obtained when the channel is strictly degraded. In combination with the rank-1 solution, this provides the complete characterization of the optimal covariance for …