Abstract-In this paper, we explore the physical-layer security of a multi-user wireless system that consists of multiple users intending to transmit to a base station (BS), while multiple eavesdroppers attempt to tap the user transmissions. We examine the employment of multi-user scheduling for improving the transmission security against eavesdropping and propose a multiuser scheduling scheme, which only requires the channel state information (CSI) of BS without the need of the passive eavesdroppers' CSI. We also consider the round-robin scheduling for comparison purposes. The closed-form secrecy outage probability expressions of the round-robin scheduling and proposed multiuser scheduling are derived over Rayleigh fading channels. Numerical results demonstrate that the proposed multi-user scheduling outperforms the round-robin scheduling in terms of the secrecy outage probability. As the number of users increases, the secrecy outage probability of round-robin scheduling keeps unchanged. By contrast, the secrecy outage performance of the proposed multi-user scheduling improves significantly with an increasing number of users. Index Terms-Secrecy outage probability, multi-user scheduling, round-robin scheduling, Rayleigh fading.
Reference REF investigated multi-user scheduling schemes to achieve secrecy performance in terms of secrecy outage probability.
Secrecy Outage Probability Analysis of Multi-User Multi-Eavesdropper Wireless Systems
IEEE/CIC International Conference on Communications in China, Shanghai, China, October 13-15, 2014
Computer Science Mathematics