Performance Comparison of MRT and ZF for Single Cell Downlink Massive MIMO System

The next generation of wireless communications high data rate and link with high reliability became main faetors in measuring the performance of system. Therefore; massive Multiple Input Multiple Output systems (massive MIMO) will be a promising technology for fifth generation wireless communication so it will provide acceptable data rate and high reliability. This paper focuses on eliminating/mitigating the effect of Multi User Interference (MUI) (an interference results from other user in same cell). The MUI has one of the major impact factors in decreasing performance (achievable sum rate) of cellular communication system when more users access to the wireless link. It presents performance comparison of two linear precoding techniques which are Maximum Ratio Transmission (MRT) and Zero Forcing (ZF) for downlink massive multiple input multiple output System over perfect channel state information depending on vector normalization and matrix normalization methods at high and low downlink transmit power. Simulations results show that using linear precoding techniques and increasing number of base station antennas enhance system performance and vector normalization and matrix normalization for ZF gives better performances at high power while vector normalization and matrix normalization for MRT gives better performance at low power.