A Nonlinear Downlink Multiuser MIMO-OFDM Systems

This letter analyzes the impact of transmitter nonlinearity on a multiuser (MU) multi-input-multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. A single value decomposition-based multiuser decomposition technique has been used to mitigate the interference between different users. It has been shown that the nonlinear distortion caused due to transmitter nonlinearity considerably degrades the performance of MU-MIMO-OFDM system and is a function of number of users. Further, this nonlinear distortion also introduces an irreducible error floor thus limiting the gains of MU-MIMO-OFDM system as compared to single user MIMO-OFDM system.