Secure Transmission for MISOME Wiretap Channels With Finite Alphabet Inputs

This letter investigates secure transmission design for multiple-input single-output multi-antenna eavesdropper wiretap channels with finite alphabet inputs. With statistical channel state information of the eavesdropper's channel at the transmitter, we utilize an approximated ergodic secrecy rate to reduce the computational complexity. Then we study joint optimization of beamforming design and power control for maximizing the approximated ergodic secrecy rate. We transform the original multi-variable optimization problem into a single-variable optimization problem, which can be solved by 1-D optimization techniques. Numerical examples show that the proposed scheme is superior to the conventional schemes.