Interference Cancellation in Uplink Multi-User MIMO Cooperative Communication System

Abstract

This paper discusses interference cancellation in an Uplink Multi-User (MU) Multiple Input Multiple Output (MIMO) system, in which a Full Duplex (FD) Decode and Forward (DF) relay is used. In order to decode the symbols at the relay, Block Diagonalization (BD) based processors are applied for MU interference cancellation. Moreover, the self-interference signal at the relay is suppressed by using the equivalent relay concept. Minimum Mean Squared Error (MMSE) technique is then adopted at the relay for information extraction. For MU interference cancellation and information extraction at the Base Station (BS), a similar procedure is applied. Simulation results show the superiority of the proposed system to the Amplify and Forward (AF) relaying system. In addition, we provide the appropriate number of antennas and transmit powers for each setup in order to achieve a relatively high sum rate.