Tomlinson-Harashima Precoding for Multiuser MIMO Systems
Xu Dao-feng①②; Huang Yong-ming①; Yang Lu-xi①;Du Ying-gang③; Li Bin③
①School of Information Science and Engineering, Southeast University, Nanjing 210096, China; ②Nanjing Research Institute of Electronics Engineering, Nanjing 210007, China;③Wireless Pre-research Department of Shenzhen Huawei Technologies, Co. Ltd., Shenzhen 518000, China
Abstract:Traditional Tomlinson-Harashima Precoding (THP), which leaves all the equalization tasks to the transmitter, prevent from fully utilizing the advantages of MIMO techniques. In this paper, a THP scheme for multiuser MIMO system is proposed. The inter-user interference is preequalized at transmitter, while the intra-user interference is equalized at each receiver. Through block lower triangular decomposition of channel matrix and waterfilling under throughput maximization criterion, the proposed scheme achieves much better sum rate performance when compared to traditional THP designed for single antenna system.