A robust RAM-THP architecture for downlink multiuser MISO transmission with user scheduling

A robust RAM-THP architecture for Zero-Forcing Tomlinson-Harashima Precoding (ZF-THP) for multi-user transmission in a multiple-input-single-output (MU-MISO) system is proposed with user scheduling and Convolutional Turbo Coding (CTC). The proposed architecture is developed to improve the rate of the system. A semi-optimal user-selection scheme is considered to make the aggregate channel matrix used by ZF-THP full rank and increase the robustness of THP under channel estimation error. The impact of the imperfect channel state information (CSI) due to block transmission is also considered. Simulation results reveal that the proposed scheduling procedure significantly improves the BER performance of the system especially in high SNR regime.