Research Article
Lattice-reduction-aided robust detection and precoding for MIMO systems with imperfect CSI
@INPROCEEDINGS{10.4108/chinacom.2010.102, author={Jiandong Li and Rui Chen and Wei Liu}, title={Lattice-reduction-aided robust detection and precoding for MIMO systems with imperfect CSI}, proceedings={5th International ICST Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2011}, month={1}, keywords={MIMO lattice reduction robust design channel state information Tomlinson-Harashima precoding}, doi={10.4108/chinacom.2010.102} }- Jiandong Li
Rui Chen
Wei Liu
Year: 2011
Lattice-reduction-aided robust detection and precoding for MIMO systems with imperfect CSI
CHINACOM
ICST
DOI: 10.4108/chinacom.2010.102
Abstract
Recently, lattice-reduction (LR) has been proposed to improve the performance of linear and successive interference cancellation (SIC) detectors and precoders in MIMO systems. It is proved that LR-aided linear detectors collect the same diversity order as that exploited by the ML detector but with much lower complexity when perfect channel state information (CSI) is assumed to be available. However, in practice, CSI is always contaminated by channel estimation error and feedback quantization error. In this paper, we proposed MMSE based LR-aided robust linear and SIC detectors and MMSE based LR-aided (robust) linear precoder and (robust) Tomlinson-Harashima precoder (THP) which are capable of improving the BER performance in the context of imperfect CSI. Furthermore, we find that the performance improvement of LR-aided nonlinear method in SIC detectors at receiver is more pronounced than that in THP at transmitter.