Efficient Transmission Solutions for MIMO Wiretap Channels with SWIPT

Efficient Transmission Solutions for MIMO Wiretap Channels with SWIPT This letter studies transmit optimization in the three-node MIMO wiretap channels with simultaneous wireless information and power transfer (SWIPT). In particular, we ad- dress the transmit covariance optimization for energy harvesting maximization (EHM) problem under the constraint of secrecy rate and transmit power. The problem is non-convex and hard to tackle. To circumvent it, we first resort to the Taylor series expansion to convert the problem into a convex optimization problem. Then, based on the analysis of its dual problem, an iterative algorithm which includes a semi-closed form solution is proposed to handle this EHM problem. The scenario of imperfect CSI of energy receiver (ER, the potential eavesdropper) is also considered. In this scenario, a Bernstein-type inequality based iterative algorithm is proposed to deal with the challenging outage-constrained EHM (OC-EHM) problem. Simulation results demonstrate the efficiency of our proposed designs.