The design of the relay system based on interference alignment and block diagonalization in multiuser MIMO channel

In this paper, we propose a relay system based on the interference alignment (IA) and block diagonalization (BD), and analyze the corresponding sum rate in a multiantenna multiuser channel. IA can suppress the intercell interference, which means that IA achieves the degree of freedom. Moreover, BD can eliminate multiuser interference and support multiple users at the same time. Simulation results show that the proposed relay enhances the sum rate performance compared to conventional relay.