Secure multi-pair massive MIMO two-way amplify-and-forward relay network with power allocation scheme
Xin Pan, Li Guo, Chao Dong, Tianyu Kang · 2017
Recently, security problems in massive multiple-input multiple-output (MIMO) network draw more and more attention. In this paper, a security problem for a multi-pair massive MIMO two-way amplify-and-forward (AF) relay network is considered, where multiple users exchange confidential messages via a common relay equipped with large number of antennas. We propose an optimal power allocation scheme that maximizes the secrecy sum rate (SSR) under power constraints, when the multi-pair sources act as both potential eavesdroppers who intend to wiretap the information of other pairs and conventional users who exchange their information with pairings. Simulation results show that the proposed scheme outperforms the equal power allocation especially under the circumstance of large number of relay antennas. Furthermore, the number of user-pairs, the Signal to Noise Ratio (SNR) and the number of relay antennas are all factors which influence the performance of SSR in this network.