Secrecy outage analysis of scan-and-wait combining scheme in multi-antenna downlink wiretap networks

The secrecy outage performance of multi-antenna downlink wiretap networks with scan-and-wait (SWC) combining scheme is analyzed, where there exists a single-antenna base station communicating with a multi-antenna legitimate user in the presence of a multi-antenna eavesdropper. A new general closed-form expression of secrecy outage probability is derived to quantify the secrecy performance, and the asymptotic secrecy outage probability is also provided to gain further insights to the secrecy performance. Numerical results are presented to validate the theoretical analysis and demonstrate the impact of key system parameters on the secrecy performance.