Sorted QR Decomposition Based Detection for MU-MIMO LTE Uplink

In this paper, we consider detection for DFT-spread OFDM based 3GPP long term evolution (LTE) uplink transmission, where multiuser multiple-input multiple-output (MUMIMO) technique is employed. We propose an iterative detection method, in which soft interference cancellation based on sorted QR decomposition of frequency domain channel matrix. We show that the new iterative detection has lower computational complexity than conventional linear minimum mean square error (LMMSE) based iterative detections. Simulation results demonstrate that the proposed low-complexity detector offers significant performance gain over the conventional LMMSE-based iterative detection.