Security in cooperative spatial multiplexing system with zero-forcing filtering

This paper is concerned with the analysis of secrecy capacity and secure outage performance of cooperative spatial multiplexing system with the effect of linear equalization. A confidential communication scenario is considered through Rayleigh fading channel in which a number of users communicate with a destination via multiple relays. An eavesdropper observes their communication and tries to decode the confidential information. At first, we derive the exact closed-form expression for the ergodic secrecy capacity with linear equalization in cooperative spatial multiplexing system. Then, we derive the exact closed-form expressions for the secure outage probability and the complementary cumulative distribution function (CCDF) of secrecy capacity to investigate the secure outage performance of the proposed model. Finally, we justify the validity of analytical results comparing with the Monte-Carlo simulation results.