Signaling Strategy Optimization for Gaussian MIMO Wiretap Channel
MIMO wiretap channel consists of a multiple antenna transmitter, a legitimate multiple antenna receiver and a multiple antenna eavesdropper. Signaling strategy optimization for MIMO wiretap channel, including secrecy capacity maximization problem and power minimization problem with a secrecy rate constraint, are studied. The authors identify when the two problems are globally solvable. Further, iterative algorithms based on concave - convex procedure are proposed for the two problems, which can monotonically converge to a Karush - Kuhn - Tucker (KKT) point of the two problems. Numerical examples validate the effectiveness of the proposed algorithms.