Performance evaluation of linear/non-linear precoding schemes for downlink multi-user MIMO systems

Multiple-input multiple-output (MIMO) systems are now a formidable area of focus for wireless communications because of its high capacity, increased diversity and interference suppression properties. In this paper, we are focusing on analyzing different linear and non-linear precoding schemes utilized for mitigating co-channel interference among different users. Notable techniques include dirty paper and its sub-optimal cases, channel inversion, block diagonalization and leakage precoding. The bit error rate (BER) expressions with each precoding technique in context to single as well as multi-user MIMO systems are derived and verified by simulation results. BER results are also presented for different channel models. Depending upon these results best precoding scheme is suggested for different number of users.