User selection scheme with secrecy capacity between other users in MIMO downlink systems

We propose a user selection scheme with secrecy capacity for multiuser MIMO downlink system whose goal is not to leak information to other users in the system. The transmitter can send confidential messages to each user securely. We evaluated system secrecy capacity. We also evaluated the system capacity and capacity-based fairness performance and showed that the proposed scheme has little performance degradation in terms of system capacity and fairness, while ensuring secrecy.