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Block Diagonalization Based Interference Cancellation in Uplink Multi User Cooperative Communication System

This paper addresses interference cancellation in uplink Multi User (MU) Multiple Input Multiple Output (MIMO) system with an Amplify and Forward (AF) Full Duplex (FD) relay. An equivalent relay model is adopted in order to suppress the self-interference. Moreover, Block Diagonalization (BD) is applied to design post-processor filters to null the MU interference, and extract the direct and relayed links signals. Afterwards, we perform Minimum Mean Squared Error (MMSE) combination of the extracted signals. Simulation results show that the proposed scheme increases the achievable sum rate of the system and highlight the significant diversity gain provided by the direct and relayed links.